Abstract

An apparatus and method for online monitoring of the resistance value of a resistor of a thyristor-level circuit of a converter valve, an electronic device, a storage medium, and a computer program product. The apparatus comprises a trigger and monitoring board and a diagnosis and early-warning device which are connected to each other; the trigger and monitoring board is connected in series to a resistor of a thyristor-level circuit, and is used for monitoring the duration for which the voltage of a sampling resistor rises from a set first threshold to a set second threshold, and transmitting the duration to the diagnosis and early-warning device; and the diagnosis and early-warning device is used for calculating the resistance of the thyristor-level circuit on the basis of the duration, and determining, on the basis of the duration and the resistance of the thyristor-level circuit, whether to give an alarm, wherein the first threshold is less than the second threshold. According to embodiments of the present disclosure, the duration for which the voltage of the sampling resistor rises from the set first threshold to the set second threshold is monitored by means of the provided trigger and monitoring board, and then whether to give an alarm is determined on the basis of the duration by means of the diagnosis and early-warning device. A direct-current voltage equalization resistor can be simply and effectively monitored, and the present disclosure has the advantages of a small number of acquisition signals, no need to measure a high-voltage signal, no need to modify an original circuit, etc.

IPC Classes  ?

• G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer

Abstract

22222 insulating coating layer with which the surface of the metal magnetic powder is coated; and the metal magnetic powder comprises a first metal magnetic powder Fe-Si-Ge-R1 and a second metal magnetic powder Fe-Si-Al-C-R2. The low-iron-loss dual-coated soft magnetic composite material prepared by the present application has low losses at medium- and high-frequencies, and also has high initial permeability, thus making it suitable for electrical equipment such as transformers and reactors.

IPC Classes  ?

• H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated

Abstract

The present application discloses a grid-forming control method and system applicable to a flexible direct-current power transmission system, and is applied in the technical field of power electronics. The method comprises: acquiring an active power control quantity and a reactive power control quantity of a flexible direct-current power transmission system, wherein the active power control quantity comprises an actual direct-current voltage value or an actual active power value, and the reactive power control quantity comprises an actual reactive power value or an alternating-current voltage amplitude reference value; on the basis of the active power control quantity, generating a valve voltage phase reference value; on the basis of the reactive power control quantity, generating a valve voltage amplitude reference value; on the basis of the valve voltage phase reference value and the valve voltage amplitude reference value, generating a three-phase valve voltage reference value; and on the basis of the three-phase valve voltage reference value, controlling a converter. A grid-forming control strategy provided in the present invention features a simple structure, a fast response speed and a good stability, and can exhibit voltage source characteristics under all operating conditions, thereby providing fast and reliable frequency and voltage support for a power grid under various complex operating conditions such as frequency variations and phase jumps.

IPC Classes  ?

• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers

Abstract

The present application discloses a direct current circuit breaker having an adjustable oscillating current and a control method therefor, a system, a device, and a storage medium. The direct current circuit breaker having an adjustable oscillating current comprises a first mechanical switch, a regulation and control unit, an oscillation unit, and a surge arrester unit. The first mechanical switch is connected in series with the regulation and control unit to form a through-current branch, and the through-current branch, the oscillation unit and the surge arrester unit are connected in parallel. The oscillation unit is used for generating an oscillating current and injecting the oscillating current into the first mechanical switch. The regulation and control unit is used for regulating the oscillating current. The surge arrester unit is used for limiting the voltage of the direct current circuit breaker and dissipating the breaking energy of the direct current circuit breaker. The present application can achieve the regulation and control of the oscillating current, and then the oscillating current can cause the current flowing through the first mechanical switch to generate a zero-crossing point, so that the direct current circuit breaker is disconnected, thereby improving the flexibility and operation reliability of the direct current circuit breaker.

IPC Classes  ?

• H02H 3/087 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current for DC applications

Abstract

The present application relates to the technical field of network security, and discloses an executor scheduling optimization method and device for a mimic defense framework. The method comprises: using a plurality of executors corresponding to a source program to be tested, so as to form a plurality of executor sets; calculating the heterogeneity of each executor set and a security defense coefficient of each executor set; using the heterogeneity of each executor set and the security defense coefficient of each executor set to calculate a scheduling function score of each executor set, and determining final scheduled objects on the basis of the scheduling function score of each executor set; and according to a decision result of each executor among the final scheduled objects in a mimic defense framework, updating the number of executors scheduled from among the final scheduled objects during each scheduling. In the technical solution provided by the present application, scheduling efficiency is optimized while guaranteeing the maximization of difference between executors, and the security and performance of a system are improved.

IPC Classes  ?

• H04L 9/40 - Network security protocols

Abstract

A magnetoelectric resonator having dual functions of energy harvesting and sensing, and a manufacturing method therefor, relating to the technical field of line monitoring devices, and used for overcoming the defects in the prior art that existing sensors are difficult to self-power and existing sensing and energy harvesting devices have large sizes and are difficult to install and deploy. The magnetoelectric resonator having dual functions of energy harvesting and sensing in the present invention comprises a cantilever beam, an energy harvesting piezoelectric unit, a sensing piezoelectric unit and a magnetic mass block; the cantilever beam comprises a fixed end and a free end; the energy harvesting piezoelectric unit and the sensing piezoelectric unit are both arranged on the cantilever beam; the energy harvesting piezoelectric unit is arranged close to the fixed end, and the sensing piezoelectric unit is arranged close to the free end; the magnetic mass block is arranged between the energy harvesting piezoelectric unit and the sensing piezoelectric unit; the output voltage of the sensing piezoelectric unit in a second-order vibration mode/the output voltage thereof in a first-order vibration mode is greater than 1. The present invention implements both energy harvesting and sensing functions in a same device, and the overall structure is compact and miniaturized, thereby facilitating integration.

IPC Classes  ?

• H03H 9/22 - Constructional features of resonators consisting of magnetostricitve material
• H03H 3/06 - Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of magnetostrictive resonators or networks

Abstract

The present disclosure relates to the technical field of direct-current power transmission. Provided in the embodiments are a controllable current-source converter valve topology and a control method therefor, a device, and a storage medium. The controllable current-source converter valve topology comprises: a current-limiting reactor connected to the DC side of a turn-off six-pulse converter bridge, each bridge arm of the turn-off six-pulse converter bridge being connected to a reactor, the midpoint tap of each bridge arm of the turn-off six-pulse converter bridge leading out to form a three-phase output, and each output lead of the three-phase output being connected to a three-phase power grid by means of a respective first reactor; the three first reactors are respectively connected to three first switches in parallel; and a connection point of each three-phase output and the first reactor connected thereto is sequentially connected to a second reactor and a capacitor, each capacitor being connected to a second switch in parallel.

IPC Classes  ?

• H02M 7/521 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration

Abstract

505050 of the second silicon nitride powder is 0.7-1.2 µm, and the mass ratio of the first silicon nitride powder to the second silicon nitride powder is (1-2):1; pressing and forming same into a green ceramic body; under a nitrogen atmosphere, keeping the temperature at 1550-1650ºC for 2-4 h; keeping the temperature at 1780-1850ºC for 2-4 h; lowering the temperature to 1200-1400ºC and maintaining said temperature for 2-4 h. The silicon nitride composite ceramic material has relatively high toughness and resistivity temperature stability.

IPC Classes  ?

• C04B 35/596 - Composites
• C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
• C04B 35/64 - Burning or sintering processes
• H01B 17/14 - Supporting insulators

Abstract

The present application relates to a thermochemical energy storage and release system, and an energy charging method for a heat storage and release material. The thermochemical energy storage and release system in the present application comprises: a reactor (1); and a microwave generator (2) and heat storage and release materials (3), which are arranged in the reactor (1). In the present application, microwaves directly act on the heat storage and release materials (3) to perform energy charging, thereby significantly improving the energy charging response speed, rationally reducing the energy charging temperature, and accelerating the regeneration process of thermochemical energy storage.

IPC Classes  ?

• F28D 20/02 - Heat storage plants or apparatus in generalRegenerative heat-exchange apparatus not covered by groups or using latent heat
• F22B 1/02 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers

Abstract

The present application relates to the technical field of network security. Disclosed are a software-defined-network-based cloud-edge collaborative defense system and method for unknown attacks. The system comprises a main station deployed at a cloud end and a plurality of edge stations deployed at an edge end. A software defined security platform comprises a main controller, a security controller and a security component resource pool. Any one of the edge stations comprises an edge controller. The security controller is configured to receive network security information uploaded by the main controller and/or any one of the edge controllers, identify an unknown attack on the basis of the network security information, generate a corresponding defense strategy and issue the defense strategy to the security component resource pool, the main controller and/or any one of the edge controllers. The security component resource pool is configured to virtualize a security protection function into a security component, and configure the main station and/or any one of the edge stations with the security component on the basis of the network security information or the defense strategy. The problem of traditional static and rigid defense measures and strategies being unable to meet the requirements for defending against unknown attacks is solved.

IPC Classes  ?

• H04L 9/40 - Network security protocols

Abstract

The present invention relates to the technical field of knowledge transfer, and specifically to a power cross-modal bidirectional knowledge transfer method and apparatus based on intermediary space construction, and a device and a storage medium. The method comprises: using graph modeling and a graph neural network to extract a first feature of first modal data, and using a large language model to extract a second feature of second modal data; on the basis of the similarity between the first feature and the second feature and a corresponding loss function, constructing an intermediary space; using a loss function in the intermediary space to iteratively optimize parameters in the graph neural network and the large language model; and on the basis of the graph modeling, the graph neural network with parameters iteratively optimized, and the feature extracted by the large language model, performing knowledge transfer in the intermediary space. By means of the method, relationship features extracted in different modes are aligned in an intermediary space, thereby realizing bidirectional knowledge transfer between different modal data.

IPC Classes  ?

• G06N 3/096 - Transfer learning
• G06N 3/042 - Knowledge-based neural networksLogical representations of neural networks
• G06N 3/0464 - Convolutional networks [CNN, ConvNet]
• G06F 40/30 - Semantic analysis
• G06F 18/22 - Matching criteria, e.g. proximity measures
• G06F 18/25 - Fusion techniques
• G06Q 50/06 - Energy or water supply
• G06N 3/048 - Activation functions

Abstract

The present invention relates to the technical field of high-voltage power transmission, and disclosed are an IGBT overvoltage protection device and method. The IGBT overvoltage protection device comprises: a controller, an overvoltage determination unit, a voltage collection unit, and a drive circuit. The voltage collection unit is used for collecting a voltage between a collector and an emitter of an IGBT; the overvoltage determination unit is used for comparing the collected voltage with a plurality of reference voltages and then outputting a plurality of overvoltage determination results; the drive circuit is used for controlling on/off of the IGBT on the basis of a drive signal; and the controller determines the current operation condition of the IGBT, then selects an overvoltage determination result corresponding to the current operation condition, and drives, on the basis of the overvoltage determination result, the drive circuit to perform overvoltage protection on the IGBT. According to the present invention, on the basis of the working condition of an IGBT, a voltage comparison result corresponding to said working condition is selected, and the IGBT is controlled to be turned on for a corresponding time period on the basis of the voltage comparison result, thereby implementing controllable and rapid overvoltage protection of the IGBT.

IPC Classes  ?

• H03K 17/081 - Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

The present disclosure relates to the technical field of switch control. Disclosed are a transmission system and method for a mechanical part and a power electronic assembly. The system comprises: a mechanical transmission shaft, a starting signal generator and a control unit, wherein the starting signal generator comprises a turntable and at least one optical fiber collimator; one end of the mechanical transmission shaft is connected to the mechanical part of a power electronic on-load tap-changer, and the other end of the mechanical transmission shaft is connected to the turntable, the mechanical transmission shaft being configured, when the mechanical part is in action, to drive the turntable to rotate; and the control unit controls, on the basis of the state of a received optical signal, whether to trigger the power electronic assembly of the power electronic on-load tap-changer. The present disclosure utilizes the advantages of stable transmission and strong anti-interference capability of an optical signal, and achieves, by means of identifying changes in the optical signal, real-time monitoring of the mechanical state, thus providing an action starting reference point for coordinated control of action timing, improving the accuracy and reliability of controlling the triggering of the power electronic assembly.

IPC Classes  ?

• H01H 3/32 - Driving mechanisms, i.e. for transmitting driving force to the contacts
• H01H 9/54 - Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
• G02B 6/32 - Optical coupling means having lens focusing means
• G02B 6/38 - Mechanical coupling means having fibre to fibre mating means

Abstract

The present disclosure relates to the technical field of high-voltage direct-current power transmission, and provides a surge protection method and apparatus for a fully controlled valve in a controllable line-commuted converter, a computer device, a computer readable storage medium and a computer program product. The method comprises: monitoring a terminal voltage of a fully controlled valve in real time; when a wave turn-off voltage per cycle of a primary IGBT valve exceeds an operating voltage of a surge arrester, subtracting 1 from an available action count of the surge arrester of the primary IGBT valve, and when a wave turn-off voltage per cycle of a secondary IGBT valve exceeds an operating voltage of a surge arrester, subtracting 1 from an available action count of the surge arrester of the secondary IGBT valve; when the available action count of the surge arrester of the primary IGBT valve is less than a second preset count, or when the available action count of the surge arrester of the secondary IGBT valve is less than the second preset count, controlling a converter to return to a power grid line-commutation operation mode; and when the available action count of the surge arrester of the primary IGBT valve is greater than a third preset count, or when the available count of the surge arrester of the secondary IGBT valve is greater than the third preset count, controlling the converter to enter a controllable line-commutation operation mode.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

The present disclosure relates to the technical field of smart power grids. Disclosed are a method and apparatus for constructing a high-order tensor network of a large-scale power grid, and a device and a medium. The method comprises: acquiring multiple category attribute sets of heterogeneous nodes in a large-scale power grid; performing feature extraction on the multiple category attribute sets, so as to obtain attribute features of the heterogeneous nodes; on the basis of the attribute features of the heterogeneous nodes, using a deep hash mapping model to establish multiple feature sub-spaces; using a breadth learning strategy to align the multiple feature sub-spaces to a unified feature dimension; on the basis of an attribute feature vector of the unified feature dimension, using a distance measurement method to calculate a distance measurement value between the heterogeneous nodes; on the basis of the attribute feature vector of the unified feature dimension and the weight of a heterogeneous node interaction relationship, determining a basis tensor for representing the heterogeneous node interaction relationship; and on the basis of the basis tensor and the weight of the heterogeneous node interaction relationship, using a tensor multiplication operation rule to construct a high-order tensor network of a large-scale power grid.

IPC Classes  ?

• G06F 18/213 - Feature extraction, e.g. by transforming the feature spaceSummarisationMappings, e.g. subspace methods

Abstract

Disclosed in the present disclosure are a direct-current transformer fault protection method and apparatus, a computer device and a storage medium. The direct-current transformer comprises at least one unit, each unit comprising a high-voltage bridge arm, a low-voltage bridge arm and a common bridge arm. The protection method comprises: acquiring a parameter of the low-voltage bridge arm, a parameter of the high-voltage bridge arm and a parameter of the common bridge arm; on the basis of respective relationships between the parameter of the low-voltage bridge arm, the parameter of the high-voltage bridge arm and the parameter of the common bridge arm and a preset protection constant value, judging the type of a short-circuit fault that has occurred; on the basis of the type of the short-circuit fault, generating a corresponding protection action signal; and on the basis of the protection action signal, generating a corresponding locking control instruction, and on the basis of the locking control instruction, locking a corresponding bridge arm. The present disclosure solves the problem of short circuit faults of direct-current transformers causing hazards to the direct current transformers and direct current systems in the prior art.

IPC Classes  ?

• H02H 7/12 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers
• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

The present invention relates to the technical field of flexible direct-current transmission. Disclosed are a direct-current transformer for direct-current grid interconnection and a control and protection method therefor. The direct-current transformer comprises a positive pole converter, a negative pole converter, and a controller. The positive pole converter and the negative pole converter each comprise a plurality of phase units. Each of the phase units comprises a common bridge arm and a plurality of port bridge arms, wherein a first end of each port bridge arm and a first end of the common bridge arm are connected to a common point, and a second end of each port bridge arm is connected to a second end of the port bridge arm of another phase unit at the same position before an output port is led out; and a direct-current voltage is input into or output from the output port and a second end of the common bridge arm. The present invention uses only the plurality of phase units to form a monopole converter, without the need for including an alternating-current isolation transformer. In addition, fewer power semiconductors are used, resulting in lower manufacturing costs.

IPC Classes  ?

• H02M 3/04 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

abcdefghii, wherein T is selected from at least one of alkali metals; E is selected from at least one of halogen elements; M is selected from at least one of rare earth metals; and a, b, c, d, e, f, g, h and i are atomic percentages of corresponding elements, where a+b+c+d+e+f+g+h+i=100 at%, 76 at%≤a≤82 at%, 3 at%≤b≤6 at%, 8 at%≤c≤12 at%, 1 at%≤d≤3 at%, 0.5 at%≤e≤1.5 at%, 0.5 at%≤f≤2.5 at%, 0.5 at%≤g≤1.5 at%, 0.5 at%≤h≤1.5 at%, 0.5 at%≤i≤2.5 at%, and g=h.

IPC Classes  ?

• C22C 33/06 - Making ferrous alloys by melting using master alloys
• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 27/25 - Magnetic cores made from strips or ribbons
• H01F 1/147 - Alloys characterised by their composition
• C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
• C21D 1/04 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields

Abstract

Disclosed in the embodiments of the present application are a fiber optic current transformer and a control method based on a fiber optic current transformer. The fiber optic current transformer comprises a photoelectric conversion unit, an error accumulation unit, a delay control unit and a fiber optic interferometer that comprises a variable delay unit, wherein the photoelectric conversion unit is used for converting a received light intensity signal into a proportional voltage signal; the error accumulation unit is used for performing feature analysis on the voltage signal to obtain a periodic misalignment error signal; and the delay control unit is used for performing linear adjustment processing on the periodic misalignment error signal to obtain a processed periodic misalignment error signal, and controlling the variable delay unit on the basis of the processed periodic misalignment error signal to change an intrinsic period of the fiber optic interferometer, such that the intrinsic period of the fiber optic interferometer is equal to half the period of a modulated square wave signal applied to the fiber optic interferometer.

IPC Classes  ?

• G01R 15/24 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices

Abstract

The present application relates to the technical field of sound insulation apparatuses, and relates to a fusible and detachable composite sound insulation cover and a transformer device having same. The fusible and detachable composite sound insulation cover comprises: a fixed module, configured to be fixedly connected to an external device; a movable module, welded and connected to the fixed module by means of a fusible wire; and sound insulation board bodies, fixedly installed on the movable module, wherein a plurality of sound insulation board bodies surround and define a closed accommodation space used for accommodating the external device. The composite sound insulation cover is used to enclose the transformer device, and the transformer device is installed in the accommodation space, so that noise generated by the transformer device during operation is blocked. When a fire occurs in the substation, the fusible wire melts in a high-temperature environment, such that the movable module automatically separates from the fixed module and detaches, causing the sound insulation board bodies to automatically fall off from the transformer device, thereby eliminating the obstruction of the sound insulation cover during firefighting. In this way, firefighting equipment can directly extinguish the fire on the transformer device, eliminating potential safety hazards posed by the sound insulation cover.

IPC Classes  ?

• E04H 5/04 - Transformer housesSubstations or switchgear houses
• H02B 1/28 - CasingsParts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
• H02B 7/06 - Distribution substations, e.g. for urban network
• E04B 1/82 - Heat, sound or noise insulation, absorption, or reflectionOther building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
• E04B 1/94 - Protection against other undesired influences or dangers against fire
• G10K 11/162 - Selection of materials
• A62C 3/16 - Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways

Abstract

The present disclosure discloses a controllable line-commutated converter forced commutation test circuit and method, a computer device, and a storage medium. The controllable line-commutated converter forced commutation test circuit comprises: a steady-state power supply and a multi-wave harmonic current source. The steady-state power supply and the controllable line-commutated converter are connected in parallel, and the steady-state power supply is used to provide a voltage and a current that meet an actual stable operating condition of the controllable line-commutated converter. The multi-wave harmonic current source and the controllable line-commutated converter are connected in parallel, and the multi-wave harmonic current source is configured to periodically inject a fault current into the controllable line-commutated converter when a primary branch and an auxiliary branch in the controllable line-commutated converter are continuously alternately turned on and off over a plurality of cycles, so as to perform periodic forced commutation testing on the controllable line-commutated converter. In the present disclosure, the test circuit for synthesizing multi-source injection is used, and by means of using the multi-wave harmonic current source, an adjustable half-wave multi-wave sub-current is injected and is superposed on a test current of the steady-state power supply, to form a test current capable of verifying a controllable turning-off function of the converter.

IPC Classes  ?

• G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers

Abstract

Disclosed in the present application are a self-energy-taking hybrid direct-current circuit breaker and an application method therefor. In the self-energy-taking hybrid direct-current circuit breaker, a breaking branch is connected to a through-current branch in parallel, a first end of a grounding branch is connected to the breaking branch, and a second end of the grounding branch is grounded. When a direct-current system operates stably, the through-current branch conducts a steady-state running current of the direct-current system, and when the direct-current system breaks down, a self-energy-taking capacitor in the breaking branch assists a power electronic device in achieving the breaking of a fault current.

IPC Classes  ?

• H02H 3/087 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current for DC applications
• H03K 17/56 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices

Abstract

Embodiments of the present invention relate to a network delay in-band telemetry method and apparatus, an electronic device, and a storage medium. The method comprises: acquiring whole network topology information, establishing a whole network topology view, and establishing a mathematical model for a whole network delay measurement problem; simplifying the mathematical model, and estimating a minimum vertex cover set of the whole network topology view; constructing a detection path set that meets a preset condition, and deploying a probe device set; mounting a probe host on each device in the probe device set, and sending a probe packet along a detection path taking the probe device as a starting point in the detection path set; controlling all network forwarding devices to add a plurality of information fields into the probe packet in the process of sending and/or forwarding the probe packet; extracting the plurality of information fields in the probe packet, and calculating link delay information on a probe packet path; and updating whole network link delay information on the basis of the link delay information of each probe device. Therefore, the real-time performance and accuracy of network delay measurement can be enhanced.

IPC Classes  ?

• H04L 43/0852 - Delays

Abstract

Disclosed in the present disclosure are a direct-current converter station protection system and a control method therefor. The system comprises: a first analog quantity acquisition module used for acquiring analog quantity data in a direct-current converter station; a second analog quantity acquisition module used for acquiring analog quantity data in the direct-current converter station; a first protection device used for outputting a first protection action signal; a second protection device used for outputting a second protection action signal; a first protection exit action module used for outputting a protection action according to the first protection action signal; and a second protection exit action module used for outputting a protection action according to the second protection action signal. According to embodiments of the present disclosure, because both the first analog quantity acquisition module and the second analog quantity acquisition device are provided, when the data acquired by one of the analog quantity acquisition modules is wrong, misoperation of the direct-current converter station protection system is avoided, thereby improving the reliability of the direct-current converter station protection system.

IPC Classes  ?

• H02H 7/12 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers
• H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
• H02H 7/125 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers for rectifiers
• H02H 1/00 - Details of emergency protective circuit arrangements

Abstract

The present disclosure discloses a controllable line-commutated converter primary branch full-control-valve shutoff control method and system, a computer device, and a storage medium. Each bridge arm of the controllable line-commutated converter is composed of a primary branch and an auxiliary branch connected in parallel, wherein the primary branch comprises a full-control valve; when there is normal alternating operation between the bridge arms of the controllable line-commutated converter, a controllable line-commutated converter primary branch full-control-valve shutoff control method comprises: based on, in a present period, a valve-side current of a converter transformer and a shutoff current reference value of a primary branch, judging whether to send a shutoff pulse to a full-control valve of the primary branch; based on a single-stage average shutoff voltage peak value of the full-control valve of the primary branch in the present period, judging whether the single-stage average shutoff voltage peak value is within a shutoff voltage reference value interval; and if the single-stage average shutoff voltage peak value does not fall within the shutoff voltage reference value interval, adjusting the next-period shutoff current reference value of the primary branch, and continuing until the single-stage average shutoff voltage peak value falls within the shutoff voltage reference value interval.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

abcdefgg, wherein M is one of Ge, Al and Ni, and N is one of rare earth elements Ce, Gd, Tb, Er and Yb; and a, b, c, d, e, f, and g are respectively atomic percentages of corresponding elements, and a+b+c+d+e+f+g=100. The alloy defines the composition of the high-saturation magnetic-induction nanocrystalline soft magnetic alloy, which has a good effect when used in a high-frequency transformer or wireless charging.

IPC Classes  ?

• H01F 1/147 - Alloys characterised by their composition

Abstract

A federated learning method includes: obtaining a target federated sub-model of a target participating node, the target federated sub-model being obtained upon dividing up a federated model, the federated model comprising at least three federated sub-models, and the target federated sub-model comprising a model parameter and a target feature of the target participating node; obtaining a current network delay and preset instances of optimization of the target feature; determining current instances of optimization on the basis of the difference between the current network delay and a preset network delay corresponding to the preset instances of optimization; performing local optimization on the target feature according to the current instances of optimization; and performing encrypted interaction of an optimization result of the target feature with other participating nodes, so as to optimize a model parameter and determine a target model parameter of the target federated sub-model.

IPC Classes  ?

• G06Q 10/0637 - Strategic management or analysis, e.g. setting a goal or target of an organisationPlanning actions based on goalsAnalysis or evaluation of effectiveness of goals
• G06Q 30/018 - Certifying business or products

Abstract

The present application provides a control method and apparatus for a direct-current energy consuming device, an electronic device, a storage medium, and a program product. The method comprises: obtaining a direct-current bus voltage value within a control period; calculating a direct-current bus voltage deviation according to the difference between the ratio of the direct-current bus voltage value to a direct-current bus voltage reference value and 1; and controlling the direct-current energy consuming apparatus to enter, exit, or maintain an original operating state according to a magnitude relationship between the direct-current bus voltage deviation and a preset fluctuation of the direct-current bus voltage.

IPC Classes  ?

• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/14 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading

Abstract

A sound barrier system for reducing electric field distortion includes a wall unit and a sound barrier unit. The sound barrier unit includes a sound barrier plate that, from top to bottom, includes an arc-shaped part, an inclined part, and a vertical part that are integrally formed, wherein a center of a circle of the arc-shaped part points towards an interior of a power facility, the inclined part is tilted away from the power facility from top to bottom and is tangent to the arc-shaped part, and a lower end of the vertical part is arranged on a top of the wall unit. The sound barrier system further includes an energy supply pipeline, a security device, and an online monitoring device. The sound barrier system can be easily manufactured, and not only can improve an acoustic environment around a substation, but also can reduce an amplitude of an electric field.

IPC Classes  ?

• G10K 11/162 - Selection of materials
• G01H 3/12 - AmplitudePower by electric means
• H02B 1/26 - CasingsParts thereof or accessories therefor

Abstract

The present application discloses a hardware pipeline GTP data shunting method and apparatus for a low-delay power service. The method comprises: receiving a first power service data packet from a base station; parsing the first power service data packet, to obtain a target tunnel endpoint identifier of the first power service data packet; on the basis of the target tunnel endpoint identifier, querying whether the first power service data packet satisfies a processing condition of a mobile edge computing device, to obtain a query result; executing a shunting operation corresponding to the query result on the first power service data packet, so as to send the first power service data packet to a target service terminal. The present application uses an FPGA module to analyze power service data packets sent by a base station to a mobile edge computing platform, to screen out a power service data packet that can be processed by a mobile edge computing device, so that shunting of the power service data packets is implemented, transmission delay is reduced, and service demands are satisfied; in addition, power service customization is implemented, improving the efficiency of power grid services.

IPC Classes  ?

• H04L 69/22 - Parsing or analysis of headers

Abstract

The embodiments of the present application relates to a power grid distribution network frame topology construction method based on a power distribution and utilization holographic data model, comprising: acquiring graphic data of a plurality of power grid devices in a power grid PMS system, converting the graphic data into topological data, and writing the topological data into a graph database; on the basis of the graph database, identifying among the plurality of power grid devices a transformer substation node and a plurality of tower nodes that have a connection relationship with the transformer substation node; determining a sag-related parameter on the basis of the distance between each two adjacent towers among the plurality of tower nodes, and constructing a sag line segment function on the basis of the sag-related parameter; and, on the basis of the sag line segment function, drawing an overhead line curve between each two adjacent towers, so as to obtain a power grid distribution network frame topological graph. Therefore, the method constructs a unified topological model by using the graph database and a three-dimensional technology, and calculates and visualizes the three-dimensional topological line sags, thereby improving the operation and maintenance management level.

IPC Classes  ?

• G06F 30/18 - Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• G06F 16/23 - Updating
• G06F 16/22 - IndexingData structures thereforStorage structures
• G06F 113/04 - Power grid distribution networks

Abstract

Disclosed in embodiments of the present disclosure is an alternating current power transmission system, comprising: a converter. The converter comprises a plurality of converter valve groups, one end of each converter valve group is connected to a first alternating current system, each bridge arm of the other end of each converter valve group is connected to a winding at one side of a first transformer in series, and a winding at the other side of the first transformer is connected to a second alternating current system. According to the present disclosure, a winding at one side of a transformer is connected to each bridge arm of a converter, so that the winding can be used for simultaneously inhibiting an interphase circulating current and improving the utilization rate of an IGBT switching device in the converter, the reactance of the bridge arms of the converter is omitted while the normal work of a converter valve is ensured, and thus the impedance of the system can be reduced, and the transmission capability of the system is improved.

IPC Classes  ?

• H02M 5/04 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
• H02M 5/10 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers
• H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

The present application provides a hybrid database management method and apparatus, a hybrid database, and an electronic device. The method comprises: on the basis of a shared connection to a hybrid database server, establishing communications with databases comprised in a hybrid database, so as to enter a first database access environment or a second database access environment, the hybrid database comprising a first database and a second database; and when the second database needs to be accessed in the first database access environment of the hybrid database, calling a preset second database connection interface in an interface layer of the first database, so as to connect to and access the second database. According to the method provided by the solution, the second database connection interface is called in the first database access environment so as to quickly switch to access the second database, thereby improving the application efficiency of the hybrid database.

IPC Classes  ?

• G06F 16/21 - Design, administration or maintenance of databases
• G06F 16/25 - Integrating or interfacing systems involving database management systems

Abstract

A voltage amplitude and phase adjustment apparatus and method, and a computer device and a storage medium. The apparatus comprises: a three-phase multi-winding transformer, a first winding switch and a second winding switch, wherein a primary side of each phase of the three-phase multi-winding transformer comprises a first split winding and a second split winding. A head end of the first split winding is connected to an input end of the present phase, and a tail end of the first split winding is connected to a head end of the second split winding of the present phase by means of the first winding switch, and is connected to the head end of the second split winding of an adjacent phase by means of the second winding switch. By means of controlling the operating states of the winding switches, the connection mode of the split windings is switched, thereby widening the adjustment range of a circuit.

IPC Classes  ?

• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02M 5/12 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of voltage or current amplitude only
• H02M 5/18 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of waveform

Abstract

The present application discloses a power supply tie transformer, and a regulation and control method therefor. The power supply tie transformer comprises: a multi-phase parallel transformer, a multi-phase series transformer, and a plurality of safety protection auxiliary adjusting devices. Head terminals of the primary side of the multi-phase parallel transformer are all connected to a first line; the secondary side of the parallel transformer is provided with at least one power supply winding and a plurality of asymmetric windings; the power supply winding is connected to a power supply end; the plurality of asymmetric windings are respectively interconnected to the adjacent phase asymmetric windings of the secondary side of the parallel transformer by means of switch bridge arm modules respectively corresponding to the plurality of asymmetric windings to obtain a first electrical quantity; the first electrical quantity is coupled to the primary side of the series transformer by means of the secondary side of the corresponding series transformer; the plurality of safety protection auxiliary adjusting devices are connected in series between the first line and a second line. The present application realizes transmission of electric energy of a first line and a second line to a power supply end, ties the first line and the second line, and realizes mutual electric energy transmission at specified power between the first line and the second line.

IPC Classes  ?

• H02J 3/06 - Controlling transfer of power between connected networksControlling sharing of load between connected networks
• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
• H02M 5/12 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of voltage or current amplitude only
• H02M 5/18 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of waveform
• H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02P 13/06 - Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changingArrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by rearranging interconnections of windings
• H01F 38/00 - Adaptations of transformers or inductances for specific applications or functions
• H01F 27/28 - CoilsWindingsConductive connections
• H01F 27/29 - TerminalsTapping arrangements
• H01F 27/40 - Structural association with built-in electric component, e.g. fuse
• H01F 29/02 - Variable transformers or inductances not covered by group with tappings on coil or windingVariable transformers or inductances not covered by group with provision for rearrangement or interconnection of windings

Abstract

Provided in the embodiments of the present disclosure are a three-phase voltage impedance adjustable transformer and a control method and control apparatus therefor, a computer device, a storage medium and a computer program product. The three-phase voltage impedance adjustable transformer comprises: a three-phase parallel transformer and a three-phase series transformer, wherein the three-phase parallel transformer is connected in parallel to power transmission lines of corresponding phases; and a primary side of each phase of the three-phase series transformer is connected in series to a power transmission line of a corresponding phase, and a secondary side of each phase in the three-phase series transformer is connected to a voltage adjustment apparatus in the three-phase parallel transformer. By means of the design, when the capacity required by the voltage impedance adjustment of a three-phase line is certain, the design capacity of an adjustable apparatus can be greatly reduced, thereby facilitating the compact design of the apparatus and reducing the manufacturing cost. Moreover, by means of the impedance adjustment design, the fault and damage probabilities of the three-phase voltage impedance adjustable transformer are reduced.

IPC Classes  ?

• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02M 5/12 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of voltage or current amplitude only

Abstract

A transient stress suppression method and apparatus for a grid forming type converter. The method comprises: on the basis of a direct-current voltage deviation and an alternating-current voltage deviation of a grid forming type converter, respectively generating a phase instruction and a voltage amplitude instruction; and, on the basis of the phase instruction and the amplitude instruction, generating a sine pulse width modulation signal used for controlling the grid forming type converter. The technical solution can ensure system stability of grid forming type converters, and can effectively cope with the problems of direct-current voltage limit exceeding and system instantaneous over-currents possibly occurring during transient response processes.

IPC Classes  ?

• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

Discloses in the present application are a power domain model pre-training method and apparatus, and fine-tuning method and apparatus, and a device, the pre-training method comprising: acquiring original power corpus data; processing the original power corpus data, the processing at least comprising word segmentation processing; for the processed power corpus data, using a whole word masking method to construct a pre-training corpus of a power domain model; constructing the power domain model, the power domain model comprising an attention matrix, and the attention matrix introducing relative position encoding between words; and using the pre-training corpus to pre-train the power domain model. The technical solution provided by the present application can improve the migration capabilities of pre-trained models.

IPC Classes  ?

• G06F 16/33 - Querying

Abstract

The present invention relates to the technical field of converter valve bushing blocking structures, and provides a keel structure and a blocking system, which avoid cracks at mounting holes for mounting of first fasteners in a blocking plate. The keel structure comprises: a transverse supporting assembly comprising a first supporting piece, at least one side of which is provided with a first recess, the first recess and a blocking plate being suitable for defining a deformation chamber allowing first fasteners to deform, the first fasteners penetrating through the blocking plate and the first supporting piece in the depth direction of the first recess, so as to suspend the middle portion of the blocking plate from the first supporting piece, and the middle portions of the first fasteners being located in the deformation chamber; and a vertical supporting assembly comprising a second supporting piece and a third supporting piece, the second supporting piece being connected to a first surface of the first supporting piece, the third supporting piece being connected to a second surface of the first supporting piece, the first surface and the second surface being two opposite surfaces adjacent to the opening of the first recess, and the second supporting piece and the third supporting piece being staggered from the first supporting piece. The keel structure is used for supporting the blocking plate.

IPC Classes  ?

• E04B 1/94 - Protection against other undesired influences or dangers against fire
• E04B 2/96 - Curtain walls comprising panels attached to the structure through mullions or transoms

Abstract

A dual-magnetic-field energy acquisition sensor and a boost converter thereof, and a control method and apparatus. The boost converter comprises a capacitor and two boost circuits, wherein each boost circuit comprises a magnetic-field energy acquisition source, an input inductor, a switching transistor, and a diode which are connected in sequence; the two boost circuits are connected in parallel and then connected to one end of the capacitor and an external load, and the other end of the capacitor is grounded. By means of two magnetic-field energy acquisition sources, the collection requirements for electromagnetic energy in a wider frequency band range can be satisfied, and the collection efficiency for the electromagnetic energy is improved, thereby solving the problem that the energy collection efficiency is low when the electromagnetic energy is low.

IPC Classes  ?

• H02J 50/10 - Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling

Abstract

The present application provides an electromagnetic transient analysis method and apparatus of a generator, a device, and a storage medium. The electromagnetic transient analysis method of a generator comprises: on the basis of a current first rotor angular displacement and first electrical state quantity of a generator, and a second rotor angular displacement of the generator in a next time step length, determining a second electrical state quantity of the generator in the next time step length; on the basis of the current first rotor angular displacement and a current first mechanical state quantity of the generator, determining a second mechanical state quantity of the generator in the next time step length; if the total duration of current electromagnetic transient analysis is greater than or equal to a preset duration, obtaining an electromagnetic transient analysis result, and ending the current electromagnetic transient analysis; and if the total duration is smaller than the preset duration, continuing the electromagnetic transient analysis. The present application can reduce the effect that different rates of change between an electrical state and a mechanical state may cause errors in an electromagnetic transient analysis result, so that the obtained electromagnetic transient analysis result has more accuracy and rationality.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation

Abstract

The present application discloses a federated learning method and system suitable for carbon credit assessment, an electronic device, and a computer readable storage medium. The method comprises: obtaining a target federated sub-model of a target participating node, the target federated sub-model being obtained upon dividing up a federated model, the federated model comprising at least three federated sub-models, and the target federated sub-model comprising a model parameter and a target feature of the target participating node; obtaining a current network delay and preset instances of optimization of the target feature; determining current instances of optimization on the basis of the difference between the current network delay and a preset network delay corresponding to the preset instances of optimization; performing local optimization on the target feature according to the current instances of optimization; and performing encrypted interaction of an optimization result of the target feature with other participating nodes, so as to optimize a model parameter and determine a target model parameter of the target federated sub-model.

IPC Classes  ?

• G06F 21/64 - Protecting data integrity, e.g. using checksums, certificates or signatures
• G06F 21/60 - Protecting data
• G06N 20/00 - Machine learning

Abstract

Provided in the embodiments of the present application is a flexible power transformer. The flexible power transformer comprises a main transformer and a converter apparatus, wherein the main transformer comprises a primary-side winding and a plurality of secondary-side windings; the converter apparatus is connected in series between a tail end of the primary-side winding of the main transformer and a tail end of any secondary-side winding of the main transformer, or the converter apparatus is connected in series between tail ends of any two secondary-side windings of the main transformer; and the converter apparatus is used for adjusting the voltage of each winding of the main transformer by means of adjusting the output voltage of the converter apparatus. In the embodiments of the present application, the function of adjusting the voltage of each winding of a transformer can be realized without changing the turn ratio of the transformer. Moreover, a voltage-source-type converter is combined with a power transformer, so as to realize rapid, continuous, accurate and flexible adjustment of the output electrical quantity of the transformer by means of a converter with a relatively small capacity.

IPC Classes  ?

• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/06 - Controlling transfer of power between connected networksControlling sharing of load between connected networks
• H02M 5/12 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of voltage or current amplitude only

Abstract

A temperature control method and apparatus for a semiconductor light source in a fiber optic current transformer, and a device, a storage medium and a computer program product. The temperature control method for a semiconductor light source in a fiber optic current transformer comprises: collecting a thermistor operation temperature, and respectively determining an operation temperature deviation amount and an operation temperature deviation change rate on the basis of a thermistor operation temperature value and a preset operation temperature value (S101); acquiring a control parameter table corresponding to a controller, and by using the control parameter table, determining controller operation parameters, which correspond to the operation temperature deviation amount and the operation temperature deviation change rate (S102); and controlling the temperature of a semiconductor light source on the basis of the controller operation parameters (S103). By means of the temperature control method for a semiconductor light source in a fiber optic current transformer, the real-time adjustment and control over the temperature of a semiconductor light source is achieved, thereby ensuring the real-time performance and stability of control over the temperature of the semiconductor light source, and safe and stable working of an all-fiber optic current transformer.

IPC Classes  ?

• G05D 23/24 - Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. thermistor

Abstract

Disclosed in the present invention are a distributed flexible resource aggregation control apparatus and control method. The control apparatus comprises: a processing control unit, wherein the processing control unit achieves uplink connection and downlink connection by means of a communication unit, and the processing control unit is connected to processing control units of other distributed flexible resource aggregation control apparatuses by means of the communication unit, so as to achieve an edge ad-hoc network, so that regional coordination and autonomy of distributed flexible resources are achieved at the edge, and complex difference brought about by massive distributed resource access network heterogeneity, mixed protocols and different response capabilities can be effectively shielded; and the processing control unit uniformly aggregates and finely processes multiple types of distributed resources by means of an energy flow regulation method, thereby effectively improving the large-scale access capability of the distributed flexible resources, improving the edge response capability of aggregation regulation, and improving the balance adjustment capability of a power grid under high-proportion new energy access.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

A high-voltage bushing includes a conductive rod and an air cooling device. The conductive rod has an air channel therein, and the air channel includes an air inlet and an air outlet. The air cooling device includes at least one fan, and the fan is configured to output air flow, so as to blow the air flow into the air channel through the air inlet.

IPC Classes  ?

• H02G 3/22 - Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02G 5/02 - Open installations

Abstract

A sound barrier system for reducing electric field distortion, comprising a wall unit and a sound barrier unit. An upper side portion of the sound barrier unit is an arc-shaped sound barrier plate, the center of the arc thereof points to the interior of an electric power facility, and the side surface of a lower side portion of the arc-shaped sound barrier plate is attached to the side surface of an upper side portion of a sound absorption layer; the sound barrier unit is provided at the top of the wall unit; the arc-shaped sound barrier plate is provided at the top end of the wall unit; the sound absorption layer is provided on the side surface of the inner side of the wall unit; the sound absorption layer is flush with the inner side of the wall unit; a sound barrier further comprises an energy supply pipeline, a security and protection device and an online monitoring device. The sound barrier system of the present invention is convenient to manufacture, can improve the sound environment around a transformer substation, and can reduce an electric field amplitude at the top of the sound barrier system to 80% of an electric field amplitude at the top of a conventional type of sound barrier system. Moreover, the sound barrier unit comprises a sound barrier plate design having an arc-shaped part, so that the wind load resistance of the system is enhanced; in addition, the energy supply facility is provided for the sound environment online monitoring device, so that the working stability of the online monitoring device is improved.

IPC Classes  ?

• E04B 2/00 - Walls, e.g. partitions, for buildingsWall construction with regard to insulationConnections specially adapted to walls
• E04B 1/86 - Sound-absorbing elements slab-shaped
• E04B 1/64 - Insulation or other protectionElements or use of specified material therefor for making damp-proofProtection against corrosion
• E04H 5/04 - Transformer housesSubstations or switchgear houses

Abstract

Embodiments of the present disclosure provide a wireless communication method and device based on an adjustable pulse width, a communication terminal, a storage medium, and a computer program product. The method comprises: obtaining data to be transmitted; encoding said data, a preset encoding mode comprising M different preset encoding bit rates; modulating the encoded data on the basis of a pulse width adjustable policy, wherein the pulse width adjustable policy refers to configuring N different preset modulation duty ratios on the basis of the M different preset encoding bit rates, and the preset encoding bit rates match the preset modulation duty ratios; and transmitting the modulated data to a target terminal. According to the embodiments of present disclosure, the preset encoding bit rates match the preset modulation duty ratios, so that different wireless channel environments are adapted so as to provide proper preset encoding bit rates and preset modulation duty ratios, and finally the current channel environment is flexibly adapted.

IPC Classes  ?

• H04L 27/10 - Frequency-modulated carrier systems, i.e. using frequency-shift keying
• H04L 25/49 - Transmitting circuitsReceiving circuits using code conversion at the transmitterTransmitting circuitsReceiving circuits using predistortionTransmitting circuitsReceiving circuits using insertion of idle bits for obtaining a desired frequency spectrumTransmitting circuitsReceiving circuits using three or more amplitude levels
• H04W 4/38 - Services specially adapted for particular environments, situations or purposes for collecting sensor information

Abstract

The present invention provides an action recognition system, method, and apparatus, a model training method and apparatus, a computer device, and a computer readable storage medium. The action recognition system comprises: a band-pass filtering module, configured to extract a dynamic feature map according to a plurality of frames of continuous images in one segment; a static feature extraction module, configured to obtain a static feature map according to the plurality of frames of continuous images in one segment; a static feature network, configured to perform feature displacement operation on the static feature maps, and calculate difference features between the static feature maps corresponding to the segments so as to obtain static classification features; a dynamic feature network, configured to perform feature displacement operation on the dynamic feature maps, and calculate difference features between the dynamic feature maps corresponding to the segments so as to obtain dynamic classification features; and a classification network, configured to obtain an action recognition result according to the static classification features and the dynamic classification features. By implementing the present invention, an action recognition model can be obtained by using less data for training, and accurate recognition of an action can be realized.

IPC Classes  ?

• G06V 40/20 - Movements or behaviour, e.g. gesture recognition
• G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
• G06V 10/82 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using neural networks
• G06K 9/62 - Methods or arrangements for recognition using electronic means
• G06N 3/08 - Learning methods

Abstract

Embodiments of the present application provide a hybrid converter valve tower, comprising: at least two first module groups arranged at intervals, each comprising a first main branch module and a first auxiliary branch module arranged in parallel; and at least two second module groups arranged at intervals, each comprising a second main branch module and a second auxiliary branch module arranged in parallel. The first module group and the second module group are alternately arranged, the output terminal of the first module group is electrically connected to the input terminal of the second module group, the output terminal of the second module group is electrically connected to the input terminal of the first module group of the next layer, a first surge arrester is arranged between the input terminals of two layers of first module groups close to each other, and a second surge arrester is arranged between the input terminals of two layers of second module groups close to each other. A first shielding cover and a second shielding cover are respectively arranged on the two sides of the first module group at the top and the two sides of the second module group at the bottom. The hybrid converter valve tower is small in size and compact in layout.

IPC Classes  ?

• H02M 7/00 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02G 13/00 - Installations of lightning conductorsFastening thereof to supporting structure

Abstract

Disclosed in the present application are a self-energy-taking hybrid direct-current circuit breaker and an application method therefor. In the self-energy-taking hybrid direct-current circuit breaker, a breaking branch is connected to a through-current branch in parallel, a first end of a grounding branch is connected to the breaking branch, and a second end of the grounding branch is grounded. When a direct-current system operates stably, the through-current branch conducts a steady-state running current of the direct-current system, and when the direct-current system breaks down, a self-energy-taking capacitor in the breaking branch assists a power electronic device in achieving the breaking of a fault current.

IPC Classes  ?

• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred

Abstract

Disclosed in the present invention are a method and apparatus for suppressing oscillation on a direct-current side of a flexible direct-current power transmission system, and a computer-readable storage medium and an electronic device. The method comprises: acquiring a single-phase active power of an alternating-current side of a converter valve, a direct-current voltage reference value of a direct-current power transmission system, a bridge arm current, and a circulating current control voltage compensation amount; obtaining a direct-current component reference value of the bridge arm current in each phase by means of performing calculation on the basis of the single-phase active power of the alternating-current side of the converter valve and the direct-current voltage reference value of the direct-current power transmission system; obtaining a direct-current component in the bridge arm current in each phase by means of performing calculation on the basis of the bridge arm current; obtaining a voltage compensation amount by means of performing calculation on the basis of the direct-current component reference value of the bridge arm current and the direct-current component; and generating a corrected bridge arm modulation wave on the basis of the voltage compensation amount and the circulating current control voltage compensation amount.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

The present application discloses a method and apparatus for determining a critical path of an energy Internet of Things physical and information system. The method comprises: creating a target adjacent matrix of the energy Internet of Things physical and information system on the basis of each adjacent matrix constituted of a physical network topology, an information network topology, and an interactive network topology of a target energy device; normalizing each adjacent matrix constituted of the physical network topology, the information network topology, and the interactive network topology in the target adjacent matrix, so as to acquire link edge weights among nodes of the physical network topology, the information network topology, and the interactive network topology; and determining a critical path in the physical network topology, the information network topology, and the interactive network topology according to the link edge weights among the nodes. In this case, on the basis of the topological structure of the energy Internet of Things, the critical degree of a network path constituted of different service attributes in the energy Internet of Things can be quantified by normalizing the link edge weights between different energy media and information media.

IPC Classes  ?

• H04L 67/12 - Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

Disclosed in embodiments of the present disclosure are a flexible DC power grid fault line isolation method based on pre-perturbation of a DC circuit breaker, a protection device and system, a computer storage medium, and a computer program product. According to the embodiments of the present disclosure, a fault recognition operation and a DC circuit breaker breaking operation are processed in parallel. The fault recognition operation is as follows: first performing fault area recognition, then performing fault interference recognition, and if the fault interference recognition is determined to be a fault, performing fault pole selection. The breaking operation of the DC circuit breaker is as follows: in a case that the fault occurs in the DC line generation area, controlling a corresponding DC circuit breaker to sequentially perform a first current conversion operation and a rapid mechanical switch opening operation in the breaking operation; in a case that the fault interference recognition is determined to be an interference, controlling the DC circuit breaker to perform a first current conversion reset operation; and in a case that the fault interference recognition is determined to be a fault, controlling the DC circuit breaker to perform a second current conversion operation.

IPC Classes  ?

• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
• H02H 7/28 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred for meshed systems
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

The present invention relates to the technical field of direct-current power transmission systems. Disclosed are converter commutation control method and apparatus, an electronic device, and a readable storage medium. The method comprises: acquiring a commutation state of a converter; determining whether the commutation state is normal; when the commutation state is abnormal, controlling the converter to start an energy consumption mode, and adjusting an energy consumption parameter of the converter, the energy consumption parameter being used to maintain transmission power in a direct-current power transmission system in which the converter is located.

IPC Classes  ?

• H02M 7/00 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output
• H02M 7/757 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
• H02M 7/797 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

Disclosed in the present invention are a self-adaptive network switching method and system, and a storage medium. According to the present invention, a device service type and a device network standard are determined on the basis of a RBF neural network so as to determine a deep Q network used for switching, and the environmental state of the current heterogeneous network or network access point is taken as an input into the deep Q network to obtain an optimal network and an optimal access point. Therefore, false switching caused by the fact that a switching index of a traditional switching algorithm is undiversified is avoided, the number of instances of device switching is reduced, and switching is more rational.

IPC Classes  ?

• H04W 36/00 - Handoff or reselecting arrangements

Abstract

Disclosed are a flexible DC transformer on-load tap changer adjustment method and system, a computer device, and a computer-readable storage medium. The method comprises: determining, according to a required relationship between an AC grid voltage and a reactive power and an actual fluctuation range of the AC grid voltage, a correspondence between an AC system voltage range regulated by an on-load tap changer and the reactive power, and determining an upper limit of a no-load voltage on a valve side of a transformer in combination with a DC voltage operating range; determining the position of the on-load tap changer on the basis of a transformation ratio of the transformer, a current AC voltage, the upper limit of the no-load voltage on the valve side of the transformer, and the step size of the on-load tap changer; and adjusting the on-load tap changer. In the present invention, a maximum value of the voltage on the valve side of the transformer that meets a specific power requirement is determined by combining factors such as the DC voltage operating range, the AC voltage fluctuation range, and a power requirement, and as the objective of adjusting the on-load tap changer, the optimized low-loss operation of a converter station is achieved, and operation economy of a project is improved.

IPC Classes  ?

• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02P 13/00 - Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
• H02P 13/06 - Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changingArrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by rearranging interconnections of windings

Abstract

Provided in the present disclosure are an IGBT device backside structure and a preparation method therefor, and an IGBT device, the IGBT device backside structure comprising a buffer layer, the buffer layer comprising a first activation efficiency buffer area corresponding to an active area of the IGBT device and a second activation efficiency buffer area corresponding to a terminal area of the IGBT device, the activation efficiency of the first activation efficiency buffer area being less than the activation efficiency of the second activation efficiency buffer area.

IPC Classes  ?

• H01L 29/08 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified, or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
• H01L 29/06 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions
• H01L 29/739 - Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field effect
• H01L 21/265 - Bombardment with wave or particle radiation with high-energy radiation producing ion implantation
• H01L 21/268 - Bombardment with wave or particle radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
• H01L 29/66 - Types of semiconductor device

Abstract

The present application discloses a direct-current circuit breaker and an application method therefor. The direct-current circuit breaker comprises: a through-flow branch that is connected in series to a power circuit; a controlled power supply unit that is connected to the through-flow branch, an oscillating branch, and a grounding unit; and an energy consumption branch that is connected in parallel to the through-flow branch or connected to the oscillating branch. When no fault occurs in the power circuit, the through-flow branch conducts a direct-current load current, a direct-current system pre-charges the oscillating branch and the controlled power supply unit, and the oscillating branch implements self-energy harvesting; and when a short-circuit fault occurs in the power circuit, by controlling the operating states of the controlled power supply unit and the through-flow branch, the oscillating branch generates an oscillating current that is equal in amplitude and opposite in direction to a fault current, so that the through-flow branch is turned off. Thus, a controlled active oscillation boosting principle is adopted, the magnitude of an injected current is improved, and arc-quenching breaking of the through-flow branch is implemented.

IPC Classes  ?

• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
• H02H 3/08 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current

Abstract

A sound insulation structure having a low-frequency broadband sound insulation function, relating to the technical field of sound insulation. The sound insulation structure having a low-frequency broadband sound insulation function comprises a plurality of sound insulation units (1) arranged periodically. Each sound insulation unit (1) comprises a substrate (2), a resonator (4), and supporting columns (3). The substrate (2) is adapted to be arranged towards a sound source. The resonator (4) is disposed on one side of the substrate (2). The resonator (4) is provided with a through opening. A cantilever plate (5) is connected in the through opening. A gap (7) is formed between the edge of the cantilever plate (5) and the inner wall of the through opening. A plurality of supporting columns (3) are provided. One end of each supporting column (3) is connected to the substrate (2), and the other end of each supporting column (3) is connected to the resonator (4).

IPC Classes  ?

• G10K 11/172 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
• G10K 11/162 - Selection of materials

Abstract

A high-voltage bushing, comprising a conductive rod and an air cooling device. The conductive rod is internally provided with an air duct, and the air duct comprises an air inlet and an air outlet. The air cooling device comprises at least one fan, and the fan is configured to output airflow so as to blow the airflow into the air duct through the air inlet.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating