Abstract

A method and apparatus for determining the safety inertia of a power grid system, and a computer device. The method comprises: determining a first safety inertia for ensuring safe operation of a power grid system when a frequency change rate after disturbance occurs in the power grid system exceeds a first threshold (S302); determining a second safety inertia for ensuring the safe operation of the power grid system when the frequency after the disturbance occurs in the power grid system is less than a second threshold (S304); and determining a target safety inertia according to the first safety inertia and the second safety inertia, wherein the target safety inertia is a safety inertia lower limit value for ensuring the safe operation of the power grid system (S306).

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks

Abstract

The present invention relates to the technical field of electrical detection, and provides a high-voltage cable defect detection method, a detection system, an electronic device, and a storage medium. According to the defect detection method, properties of a wavelength change in a spectral signal and precipitation of a characteristic gas caused by a temperature rise of a water-blocking buffer layer in a high-voltage cable due to an ablation defect are utilized. The spectral signal is detected so as to determine the presence of a defect in a first target paragraph, then a gas of the first target paragraph is sampled and analyzed, and a degree of the ablation defect is determined on the basis of compositions and content amplitude of a gas signal. A position where the ablation defect appears is located and detected by using a non-electrical characteristic quantity, so that the influence of electromagnetic interference on a detection instrument and device can be avoided, an operator does not need to perform imaging detection on the high-voltage cable along an entire path, and the field adaptability and accuracy of the detection of an ablation defect of the water-blocking buffer layer in the high-voltage cable can be effectively improved.

IPC Classes  ?

• G01N 21/25 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• G01N 21/88 - Investigating the presence of flaws, defects or contamination
• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

Abstract

An adjustable voltage source, a power distribution system, and a power adjustment method for a power distribution system. The power adjustment method for a power distribution system comprises: determining a target active power transmitted between a first line and a second line in a power distribution system, a three-phase voltage on a power source side of the first line, and a three-phase voltage on a power source side of the second line (S102); determining a target adjustment voltage of an adjustable voltage source according to the target active power, the three-phase voltage, a line impedance and a line load on the power source side of the first line, the three-phase voltage, a line impedance and a line load on the power source side of the second line, and a target relational expression (S104); and according to the target adjustment voltage, determining a target amplitude modulation transformation ratio of an amplitude modulation winding and a target phase modulation transformation ratio of a phase modulation winding in the adjustable voltage source, and according to the target amplitude modulation transformation ratio and the target phase modulation transformation ratio, adjusting a transformation ratio of each winding in a secondary winding in the adjustable voltage source, such that the voltage of the adjustable voltage source reaches the target adjustment voltage, and the active power transmitted in the power distribution system reaches the target active power (S106).

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 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
• 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
• H01F 29/04 - 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 having provision for tap-changing without interrupting the load current

Abstract

The present disclosure provides an equivalent aggregation method and an apparatus for an electro-thermal coupled virtual power plant. The method includes: obtaining an equivalence model in a heating section of the electro-thermal coupled virtual power plant by training a support vector machine; establishing a computing model for equivalent aggregation of the electro-thermal coupled virtual power plant; and realizing the equivalent aggregation of the electro-thermal coupled virtual power plant by solving the computing model for the equivalent aggregation of the electro-thermal coupled virtual power plant.

IPC Classes  ?

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

Abstract

A method for quantifying and assessing a scheduling risk considering source load fluctuation and rescheduling, and an apparatus for quantifying and assessing a scheduling risk considering source load fluctuation and rescheduling are provided. The method includes establishing a scene set considering a new energy disturbance; establishing and solving a rescheduling optimization model considering the new energy disturbance in each scene based on a preset scheduling plan according to the scene set, so as to obtain a solving result of the rescheduling optimization model; and calculating a risk quantifying and assessing result corresponding to the preset scheduling plan according to the solving result of the rescheduling optimization model.

IPC Classes  ?

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

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

Provided are a system frequency modulation method and system for a thermostatically controlled load cluster, and a device and a medium. The system frequency modulation method comprises: acquiring initial parameters of a thermostatically controlled load cluster; establishing a 2D state-bin thermostatically controlled load cluster model; establishing a state space model of the thermostatically controlled load cluster according to the 2D state-bin cluster thermostatically controlled load cluster model, and solving a state-bin transition probability on the basis of a Markov chain, so as to obtain a state transition matrix; calculating a primary frequency modulation power change value of the thermostatically controlled load cluster according to a primary frequency modulation model of the thermostatically controlled load cluster, and calculating a secondary frequency modulation power change value of the thermostatically controlled load cluster according to a secondary frequency modulation model of the thermostatically controlled load cluster; obtaining control schemes for the thermostatically controlled load cluster; and performing controllable load selection on the control schemes for the thermostatically controlled load cluster on the basis of multi-scale priority sorting, and outputting a result of the controllable load selection. The method has relatively good comprehensive performance with regard to control precision, response speed, fairness of load-participation in demand response, etc.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• 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

Disclosed in the present application are an abnormal data processing method and apparatus, and an electronic device. The method comprises: a front server receives power data, on a power device, acquired by a terminal, wherein the power data at least comprises a GPS state, electromagnetic interference state information, and an acquisition time; when determining that the GPS state in the power data is abnormal, the front server replaces the acquisition time with a local time of the front server; and when determining that the electromagnetic interference state information is present in the power data, the front server removes, from the power data, power data with electromagnetic interference. The present application solves the technical problem of inconvenience in data analysis caused by data errors caused by anomalies in a terminal.

IPC Classes  ?

• G06F 16/215 - Improving data qualityData cleansing, e.g. de-duplication, removing invalid entries or correcting typographical errors

Abstract

Disclosed in the present invention are an operation and maintenance debugging method and system, and a non-volatile storage medium and a processor. The method comprises: a meter reading controller establishing a connection with a control-end device by using a target communication protocol, and receiving a first control instruction from the control-end device after the connection is established, wherein the first control instruction is used for instructing the meter reading controller to search for a target communication device from among a plurality of communication devices, and establish a communication relationship with the target communication device from among the plurality of communication devices, and the plurality of communication devices are communication devices that use different high-speed power line carrier schemes; after receiving the first control instruction, the meter reading controller searching for the target communication device, and establishing a communication relationship with the found target communication device by means of a power line; and after the communication relationship is established, the meter reading controller sending a second control instruction to the target communication device by means of the power line and by using a target communication protocol, wherein the second control instruction is used for acquiring operation data of the target communication device.

IPC Classes  ?

• H04B 3/54 - Systems for transmission via power distribution lines
• H04Q 9/00 - Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A transaction harmony degree-based method and system for transaction matching between a power grid and building energy. The method includes: obtaining a transaction harmony degree of a historical transaction cycle; sending, by using a blockchain, the transaction harmony degree to a corresponding building energy user, and sending a maximum compensated electricity price and an expected compensated electricity price in peak-valley regulation to all building energy users; determining, by each building energy user, a transaction-based compensated electricity price in the peak-valley regulation based on the received transaction harmony degree and the received maximum compensated electricity price and expected compensated electricity price in the peak-valley regulation, and feeding back the transaction-based compensated electricity price in the peak-valley regulation to a power grid; and determining, by the power grid, a building energy user that successfully performs transaction matching with the power grid.

IPC Classes  ?

• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

A data acquisition apparatus and a data acquisition method. The data acquisition apparatus comprises a device host and at least one expansion card; the at least one expansion card is used for acquiring the extended electrical capacity so as to obtain sampled data; and the device host communicatively and electrically communicates with the at least one expansion card, is used for receiving the sampled data, and performs data processing on the sampled data. Hence, the technical problem in which existing measurement devices cannot meet the requirements of the existing technology is solved.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

Abstract

A transaction harmonicity-based power grid and building energy transaction matching method and system. The method comprises: obtain a transaction harmonicity of a historical transaction period; send, by means of a blockchain, the transaction harmonicity to a corresponding building energy consumption side, and a maximum peak-valley regulation compensation electricity price value and an expected peak-valley regulation compensation electricity price value to all building energy consumption sides; the building energy consumption sides determine a peak-valley regulation transaction compensation electricity price according to the received transaction harmonicity, maximum peak-valley regulation compensation electricity price value, and expected peak-valley regulation compensation electricity price value, and feed back the peak-valley regulation transaction compensation electricity price to a power grid side; and the power grid side determines the building energy consumption side that is successful in transaction matching. According to the transaction harmonicity-based power grid and building energy consumption transaction matching method and system, a blockchain platform is used as a transaction core, and the regulation capability of various types of regulation resources including building energy consumption sides is fully exerted, thereby implementing efficient, fair and transparent power transactions of building energy consumption sides in response to a peak-valley regulation policy of a power grid side, and ensuring safe and economical operation of a power grid.

IPC Classes  ?

• G06F 30/25 - Design optimisation, verification or simulation using particle-based methods
• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
• G06Q 30/02 - MarketingPrice estimation or determinationFundraising
• G06Q 50/06 - Energy or water supply

Abstract

Disclosed in the present application are a power grid clock synchronization method and device. The method comprises: in a low-voltage line of a power supply and distribution system, determining whether a branch line exists in a target line segment; in the case that the branch line does not exist in the target line segment, performing time synchronization on nodes on the target line segment on the basis of the relationship between current phases of the nodes; in the case that the branch line exists in the target line segment, determining at least one bus corresponding to the branch line, and performing time synchronization on branch nodes on the basis of the relationship between voltage phases of the branch nodes on each bus; and performing time synchronization on sub-nodes on the basis of the relationship between current phases of the sub-nodes on a branch line segment corresponding to each branch node. According to the present application, the problems in the related art that the time synchronization precision of the power supply and distribution system is not high and a synchronization signal is susceptible to interference are solved.

IPC Classes  ?

• H04J 3/06 - Synchronising arrangements
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network

Abstract

A forward compatibility method and circuit for a direct-current charging control circuit of an electric vehicle, and a converter. The method comprises: arranging equivalent resistors (Rd, R', Rc', Rc") on a CC1 loop and/or a CC2 loop; on the side of an electric vehicle, determining the type of a charger by means of monitoring the voltage on a CC2 line, and performing a charging flow according to the type of the charger; and on the side of the charger, by means of monitoring the voltage on a CC1 line, determining whether the charger is reliably connected to allow safe charging. An electric vehicle can be charged with all common chargers in the market, thereby realizing forward compatibility of a direct-current charging control guiding circuit.

IPC Classes  ?

• B60L 53/16 - Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
• H01R 31/06 - Intermediate parts for linking two coupling parts, e.g. adapter
• H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters

Abstract

A power system dispatching method considering voltage sensitive load reserve is provided, with which a power system dispatching model constituted by a ground state operating point model of the power system, an evaluation model of the voltage sensitive load regulation range and an optimization objective of power system dispatch is established, by solving the power system dispatching model, a power system dispatching solution considering voltage sensitive load reserve is obtained.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• G05B 13/04 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators

Abstract

Provided are a method and apparatus for recommending an electric vehicle charging facility. The method comprises: in response to a charging facility recommendation request sent by a client, acquiring current state information of an electric vehicle (S110); acquiring a candidate charging facility list on the basis of the current state information (S120); calculating the user acceptance probability of each candidate charging facility in the candidate charging facility list (S130), wherein the user acceptance probability of each candidate charging facility represents the probability that a user selects each candidate charging facility; and sorting all the candidate charging facilities in the candidate charging facility list on the basis of the user acceptance probabilities, and sending the candidate charging facility list, after sorting, to the client (S140).

IPC Classes  ?

• G06F 16/9535 - Search customisation based on user profiles and personalisation
• B60L 53/60 - Monitoring or controlling charging stations

Abstract

A charging pile test method, device and system, a storage medium and a processor. Said method comprises: acquiring a test task set of charging piles (30), the test task set at least comprising a first test task and a second test task; configuring a first power source and a first load for a first charging pile (302) on the basis of the first test task, and controlling the first charging pile (302) to execute the first test task, and configuring a second power source and a second load for a second charging pile (304) on the basis the second test task, and controlling the second charging pile (304) to execute the second test task; and in cases where the first charging pile (302) completes the first test task and the second charging pile (304) completes the second test task, interchanging the first test task and the second test task. Said method solves the technical problem of low efficiency of batch test of charging piles.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

A method and device for text classification. The method comprises: acquiring text to be classified (S102); inputting the text into a model, wherein the model is obtained through machine learning and training by using training data (S104); using the output acquired from the model as a category corresponding to the text (S106); and storing the text and the category corresponding thereto (S108). The technical problem that text classification in the prior art relies on a manual mode is solved.

IPC Classes  ?

• G06F 16/35 - ClusteringClassification
• G06N 20/00 - Machine learning
• G06F 16/332 - Query formulation

Abstract

The present disclosure proposes a decomposition-coordination voltage control method for wind power to be transmitted to a nearby area via flexible DC. The method includes: initializing parameters; sending the parameters to wind power farms; for each of the wind power farms, establishing a voltage control optimization sub-model; solving the voltage control optimization sub-model to obtain a first optimal result; for the control center, establishing a voltage control optimization main model; solving the voltage control optimization main model to obtain a second optimal result; calculating a determination index based on the first optimal result and the second optimal result; and determining whether the determination index is convergent to an admissible value, if no, updating the parameters and returning to establishing the voltage control optimization sub-model.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• F03D 7/04 - Automatic controlRegulation
• H02P 9/04 - Control effected upon non-electric prime mover and dependent upon electric output value of the generator
• H02P 101/15 - Special adaptation of control arrangements for generators for wind-driven turbines

Abstract

A partial discharge detection sensor and a manufacturing method therefor. The partial discharge detection sensor comprises a first half-ring magnetic core member (1), and a second half-ring magnetic core member (2) disposed corresponding to the first half-ring magnetic core member (1); the first half-ring magnetic core member (1) and the second half-ring magnetic core member (2) are disposed to surround an element to be detected (3) in a circumferential direction; and the first half-ring magnetic core member (1) comprises at least two magnetic core blocks (4) connected together, or the second half-ring magnetic core member (2) comprises at least two magnetic core blocks (4) connected together, or the first half-ring magnetic core member (1) and the second half-ring magnetic core member (2) both comprise at least two magnetic core blocks (4) connected together.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
• G01R 1/16 - Magnets

Abstract

An active power distribution network multi-time scale coordinated optimization scheduling method and storage medium are provided. The method includes the following steps: performing long-time scale optimization scheduling of an active power distribution network; performing short-time scale rolling optimization scheduling on the basis of MPC of the active power distribution network according to an optimization result of the long-time scale optimization scheduling of the active power distribution network. By using a model prediction control method, taking the long-time scale optimization scheduling result as a reference, and performing short-time scale rolling correction, the optimization scheduling of the active power distribution network is achieved, thereby reducing unfavorable influences of prediction precision of a distributed power supply and a low-voltage load on the optimization scheduling.

IPC Classes  ?

• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers
• G06F 1/3209 - Monitoring remote activity, e.g. over telephone lines or network connections
• G06F 1/3228 - Monitoring task completion, e.g. by use of idle timers, stop commands or wait commands
• G06F 1/329 - Power saving characterised by the action undertaken by task scheduling
• G06F 17/16 - Matrix or vector computation
• 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 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

Systems and methods are disclosed to control a power inverter by extracting photovoltaic (PV) maximum power under a plurality of operating conditions as one or more reference variables; predicting the future behaviors of a PV output voltage as one or more controlled variables based on a current operational condition; generating one or more control signals for the H5 inverter that minimizes an error between the reference variable and the controlled variables; and controlling the power inverter with the one or more control signals.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02M 7/5387 - 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 triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Abstract

mm for obtaining the two sets of partial discharge signals; and 3) determining a position of a partial discharge point. Also provided are an apparatus for partial discharge detection of a high-voltage cable and a computer storage medium.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A method, device and system for controlling an air source heat pump, and an air source heat pump. The method comprises: receiving heating request information of a target space that is uploaded by an air source heat pump, the target space being an indoor space that is warmed by using the air source heat pump; according to the heating request information and dynamic electricity consumption information of a grid system, determining the electric power that is outputted from the grid system to the air source heat pump; issuing a control instruction to the air source heat pump, the control instruction being used for controlling the air source heat pump to operate by using the electric power.

IPC Classes  ?

• F24F 11/00 - Control or safety arrangements
• F24D 19/10 - Arrangement or mounting of control or safety devices

Abstract

Disclosed by the present invention is a partial discharge built-in sensor structure of a capacitance high-voltage cable joint, comprising a sensor and a high-voltage cable; the sensor is cylindrical and is provided in sequence from inside to outside with: a dielectric thin film, a copper foil electrode, and a buffer layer, the copper foil electrode and the dielectric thin film adhering tightly to form a sensor electrode; the sensor is provided thereon with a radio frequency wire joint. The high-voltage cable is provided in sequence from inside to outside with a conductive cable core, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a semi-conductive water-resistant strip, a corrugated aluminum sheath, an anti-corrosion layer, and an outer sheath; the periphery of the inner semi-conductive layer is connected to the dielectric thin film; an end of the sensor is connected to a connector in which an inner portion is a spiral structure, the inner portion spiral structure of the connector fitting with the corrugated aluminum sheath of the high voltage cable; the periphery of the corrugated aluminum sheath is connected to the inner portion spiral structure of the connector. The present invention increases the sensitivity in monitoring partial discharge of high-voltage cables and is long-lasting and durable, while assembly and disassembly are extremely convenient.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

An AC/DC hybrid power system and a DC-side fault protection method. The system comprises an AC power supply (01), an AC bus (02), an AC feed line (03), an AC switch (04), an AC/DC conversion device (05), an arc extinguishing device (06), a fault current damping device (07), a voltage measurement device (51) for a DC positive bus (101), a voltage measurement device (52) for a DC negative bus (102), and a ground current measurement device (08). Whether a DC-side ground fault has occurred in the AC/DC hybrid power system is determined by means of detecting magnitudes of a DC voltage and a ground current of the system. When there is no DC ground fault, a damping resistor is bypassed by using a bi-directional switch. The arc extinguishing device compensates for ground faults of the AC system, such that a protection mechanism is unaffected by the fault current damping device when a fault occurs in the AC system, enhancing the operation reliability of the system.

IPC Classes  ?

• H02H 9/08 - Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

An explosion proof gasket and a switch cabinet having same. The explosion-proof gasket comprises a gasket body (10). The gasket body (10) comprises: a first through hole (11) which runs through the gasket body (10) and through which a cabinet-penetrating bus (30) penetrates the gasket body (10); a first opening (12) which is in communication with the first through hole (11) by extending inwardly from the periphery of the gasket body (10); and a closing structure, disposed on the gasket body (10), located at two sides of the first opening (12), and used for closing the first opening (12). By means of the structure, an explosion-proof gasket can be conveniently disposed on a cabinet-penetrating bus of a switch cabinet, thereby improving the safety of the switch cabinet.

IPC Classes  ?

• H02B 1/20 - Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
• H02B 1/30 - Cabinet-type casingsParts thereof or accessories therefor

Abstract

An active power distribution network multi-time scale coordinated optimization scheduling method and storage medium. The method comprises the following steps: performing long-time scale optimization scheduling of an active power distribution network; performing short-time scale rolling optimization scheduling on the basis of MPC of the active power distribution network according to an optimization result of the long-time scale optimization scheduling of the active power distribution network. By using a model prediction control method, taking the long-time scale optimization scheduling result as a reference, and performing short-time scale rolling correction, the optimization scheduling of the active power distribution network is achieved, thereby reducing unfavorable influences of prediction precision of a distributed power supply and a low-voltage load on the optimization scheduling.

IPC Classes  ?

• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers

Abstract

A circuit breaker detection method, device and system. The method comprises: acquiring a current value and a vibration signal of an electromagnet coil in a circuit breaker in a chronological order (S11); determining, via the current value of the coil, an operation time interval of the circuit breaker (S13); processing the vibration signal within the operation time interval to obtain a fingerprint feature parameter for operation state detection of the circuit breaker (S15); and comparing the fingerprint feature parameter with a preset fingerprint feature database to determine an operation state of the circuit breaker (S17). The present invention addresses the technical problem in which a high detection cost and complex operations are caused by a large volume and complex installation of an existing detection device for a circuit breaker.

IPC Classes  ?

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

Abstract

Disclosed are a method and device for controlling reserved charging of an electric vehicle. The method comprises: acquiring reserved charging information and preset optimization control parameters (S11); acquiring vehicle state information of a vehicle pre-bound with the reserved charging information (S13); determining a reserved charging scheme set for the vehicle according to the reserved charging information and the vehicle state information (S15); and using the optimization control parameters to screen out a recommended charging scheme from the reserved charging scheme set (S17). The technical problem is solved that the impossibility of optimizing reserved charging of the electric vehicle leads to a waste of resources in charging equipment and also brings poor charging experience to users.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H01M 10/44 - Methods for charging or discharging

Abstract

A distribution box (100), comprising: a plurality of metering devices (10-1, 10-2, 10-3) installed in the distribution box, a first output end (B1-1, B1-2, B1-3) of each metering device being used to output electric power information; an acquisition device (12) comprising a second output end (A2), the second output end being connected to a first input end (A1-1, A1-2, A1-3) of each metering device respectively to transmit an acquisition instruction to each first input end (A1-1, A1-2, A1-3); a second input end (B2) connected to a first output end (B1-1, B1-2, B1-3) of each metering device for acquiring the electric power information of the metering device; a communication device (14) connected to the acquisition device (12) for transmitting the electric power information acquired by the acquisition device (12) to an external device. The present invention addresses the technical problem of low efficiency due to manual acquisition of electric power information in the distribution box.

IPC Classes  ?

• H02B 1/46 - BoxesParts thereof or accessories therefor

Abstract

A method and apparatus for detecting an ageing degree of a battery. The method for detecting an ageing degree of a battery comprises: testing a first battery to acquire a first battery parameter (S102), wherein the first battery is a brand-new battery; testing a second battery to acquire a second battery parameter (S104), wherein the second battery is a completely-aged battery; testing a third battery to acquire a third battery parameter (S106), wherein the third battery is a battery to be tested, the first battery, the second battery and the third battery are identical batteries, and the ageing degrees of the third battery and of the second battery are different; and calculating the ageing degree of the third battery by means of the first battery parameter, the second battery parameter and the third battery parameter (S108). By means of the detection method, the problem in the prior art that the ageing degree of a battery is detected inaccurately is solved, and the effect of detecting the ageing degree of a battery accurately is further achieved.

IPC Classes  ?

• G01R 31/36 - Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]

Abstract

A voltage sag simulation and evaluation method of an active power distribution grid, comprising: step 1: constructing a model via an existing power distribution grid analysis software, and calculating a network trend; step 2: generating power distribution grid failure data and distributed power source capacity data via two-point sampling, and determining a simulation solution; step 3: conducting a simulation calculation to calculate an expectation, a variance, a third central moment, a probability density function f(ξ) and a SARFIx index of a voltage sag of each node; step 4: calculating a probability density function f(ξ)MC and a SARFI'x index of a voltage sag amplitude of each node via a Monte Carlo method; step 5: respectively comparing the f(ξ) with the f(ξ)MC, and the SARFIx index with the SARFI'x index, and if a comparison requirement is not satisfied, then returning to step 2. Compared with the prior art, the voltage sag simulation and evaluation method of an active power distribution grid synthetically considers various short-circuit faults in the power distribution grid, thus being suitable for a power distribution network with various wiring modes, and having a high calculation efficiency.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply

Abstract

A location method and apparatus for a partial discharge source of a transformer solve problems in the prior art that location failure can be easily caused in the case of certain time errors and distance measurement errors. The location method comprises: reading the starting time of an electromagnetic wave signal detected by each sensor in a four-element sensor array (S102); establishing a time-range difference equation set for the propagation of the electromagnetic wave signal according to the starting time (S104); calculating the time-range difference equation set within a preset confidence interval using the Newton's iteration location algorithm to obtain a calculation result in a complex field (S106); determining whether the calculation result is in a complex form (S108); determining a real solution of the time-range equation set using a grid search algorithm on the basis of the calculation result if the calculation result is determined to be in a complex form (S110); and outputting the real solution serving as a position coordinate for the discharge source (S112).

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A method and device for detecting partial discharge of a cable. The method comprises: acquiring through coupling a coupled signal from a detected cable through a coupling sensor (S102); implementing signal conditioning and analysis on the coupled signal to obtain a partial discharge signal on the detected cable (S104); and using the partial discharge signal to determine a partial discharge position on the detected cable (S106). The method solves the problem in the prior art that the accuracy of partial discharge detection is not high, and the effect of accurately detecting the partial discharge position of the detected cable is achieved.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A charging circuit and system for a rechargeable battery. The charging circuit comprises a bidirectional DC/DC conversion circuit constituted by a first IGBT (11), a first diode (D1), a second IGBT (12) and a second diode (D2); a first current sensor connected between a source electrode of the first IGBT and a positive electrode of a rechargeable battery; a second current sensor connected between the source electrode of the first IGBT and the positive electrode of the rechargeable battery; and a control circuit respectively connected to grid electrodes of the first and second IGBTs and the first and second current sensors. The circuit improves the reliability of a charging station system.

IPC Classes  ?

• H02J 7/10 - Regulation of the charging current or voltage using discharge tubes or semiconductor devices using semiconductor devices only

Abstract

A data conversion method and apparatus. The data conversion method comprises: acquiring reference data in a reference data source (S802); reading a reference data format of the reference data (S804); acquiring to-be-converted data in a to-be-converted data source (S806), a to-be-converted data format of the to-be-converted data and the reference data format being different formats; and converting the to-be-converted data into target data according to the reference data format (S808), a target data format of the target data being the same as the reference data format. The method solves the technical problem in the related art that cross-data source analysis cannot be performed on data of different data sources.

IPC Classes  ?

• G06F 17/30 - Information retrieval; Database structures therefor

Abstract

Disclosed are a reconstruction method and device for an active power distribution network. The reconstruction method for an active power distribution network comprises: acquiring a plurality of time periods within a pre-determined time; acquiring network losses of a plurality of nodes in an active power distribution network within each time period of the plurality of time periods; comparing the size of the network losses of the plurality of nodes, and acquiring three nodes having the minimum network losses in sequence; conducting one-to-one pairing on the nodes within every two adjacent time periods, so as to form three topological chains, wherein each of the three nodes is paired with the node having the minimum number of switching actions in the three nodes within the adjacent time period in sequence from the minimum to the maximum number of switching actions; and selecting the topological chain having the minimum sum of network loss costs and switching costs in the three topological chains formed within the pre-determined time as the reconstruction solution of the active power distribution network, wherein the switching costs are the costs generated in the switching actions. By means of the embodiments of the present invention, the problem in the prior art that the reconstruction of an active power distribution network consumes a relatively long time is solved, thereby achieving the effect of reducing the time consumption of the reconstruction of the active power distribution network.

IPC Classes  ?

• G06Q 50/00 - Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

The present invention discloses an active distribution network reconfiguration method and apparatus. The active distribution network reconfiguration method comprises: a target function of a minimum power generation charge is obtained; calculations are performed according to the target function of the minimum power generation charge to obtain a first electricity purchase scheme; in the first electricity purchase scheme, a main grid power and a first distributed supply power are obtained; a target function of a minimum grid loss charge is obtained; the first main grid power and first distributed supply power are substituted into the target function of the minimum grid loss charge, and a first topology is calculated and obtained; it is determined whether the sum of the power generation charge under the first electricity purchase scheme and the grid loss charge under the first topology satisfies a preset condition; if the preset condition is satisfied, then the first electricity purchase scheme and the first topology serve as the reconfiguration scheme of the active distribution network. The present invention solves the problem of it being impossible to give consideration to both the electricity purchase charge and the active distribution network topology when performing active distribution network reconfiguration.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply
• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)

Abstract

The embodiments of the present invention disclose a signal processing method and device used for an active distribution network. The signal processing method used for the active distribution network comprises: a data signal in an active distribution network and transmitted by means of a power line operating frequency is received; differential processing is performed on said data signal to obtain power grid noise; according to the data signal and the power grid noise, a reduced differential signal is obtained; a reference signal pre-established using a Gaussian window function and corresponding to the data signal is obtained; if the signal modulation time domain is determined, then the output associated with the reference signal and the reduced differential signal is calculated to obtain a calculated result; and the data signal is demodulated using said calculated result. The embodiments of the present invention solve the problem of the likelihood of errors when demodulating received data, and thus effectively suppress high-frequency interference.

IPC Classes  ?

• H04B 3/54 - Systems for transmission via power distribution lines

Abstract

A power system control method and a device. The power system control method comprises: obtaining the output history data of the distributed power supplies in the power system (S102); establishing an uncertainty set of the distributed power supply on the basis of the history data (S104), and the uncertainty set is used to reflect an output uncertainty range of the distributed power supplies; calculating a power imbalance quantity of the distributed power supplies (S106), and the power imbalance quantity is used to reflect the extreme output condition of the distributed power supplies; modifying the uncertainty set with the power imbalance quantity, so as to obtain a modified uncertainty set (S108); and controlling the power system operation with the modified uncertainty set (S110). The control method solves the problem of the low power system operation stability after the distributed power supplies are connected into the grid, and achieves the effect of improving power system operation stability.

IPC Classes  ?

• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

An illuminance test device, comprising a box body (10), a fog and haze simulation part (20) and a detection unit, wherein an installation rack (11) for installing a lamp (12) to be tested is arranged in the box body (10), the fog and haze simulation part (20) is in communication with the box body (10) and transports fog and smoke dust into the box body (10), and the detection unit is arranged inside the box body (10) and detects the illumination intensity of the lamp (12) to be tested. By means of the illuminance test device, the illuminance of a lighting appliance in a fog and haze environment can be measured, and experimental data can be provided for the arrangement of the lighting appliance in the fog and haze environment.

IPC Classes  ?

• G01J 1/00 - Photometry, e.g. photographic exposure meter
• G01M 11/02 - Testing optical properties

Abstract

A control guidance detection circuit and device of a charging pile. The control guidance detection circuit of a charging pile comprises: a central processing unit; a voltage detection module which is connected to the central processing unit and is used for detecting a guidance voltage of the charging pile; a PWM detection module which is connected to the central processing unit and is used for detecting the duty ratio of a PWM waveform of the charging pile; an interface module which is used for connecting a charging cable and is connected to the central processing unit; a man-machine interaction module which is connected to the central processing unit; and a power supply module which is connected to the central processing unit, the voltage detection module, the PWM detection module and the man-machine interaction module respectively. By means of the control guidance detection circuit and device, the problem in the prior art that a charging process of a charging pile cannot be detected is solved, thus conducting control guidance detection on the charging pile, and providing a guarantee of security.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

Disclosed are a communication network monitoring method, device and system in an electric power system, the method comprising: acquiring the network status data of an electric power system; checking whether the network status data is consistent with preset status data; and if yes, then reading from a preset monitoring database the monitoring data corresponding to the preset status data. The present invention allows quick and accurate acquisition of a report on the network communication status of an intelligent transformer substation according to the network status data, and provides efficient network management for the intelligent transformer substation according to the status.

IPC Classes  ?

• H04L 12/26 - Monitoring arrangements; Testing arrangements

Abstract

Provided are a locating method of a partial discharge source and a locating system of the partial discharge source. The locating method of a partial discharge source comprises: arranging two same UHF sensors on opposite faces of a device to be detected to acquire ultra-high frequency partial discharge signals; moving one or two of the two same UHF sensors along the connection line of the two same UHF sensors, and simultaneously outputting the acquired ultra-high frequency partial discharge signals through oscilloscopes respectively connected to the two same UHF sensors; and when the waveforms of the ultra-high frequency partial discharge signals acquired by the two same UHF sensors coincide, determining that distances from the partial discharge source in the device to be detected to a first location point and a second location point where the two same UHF sensors are currently located are equal. By using the solutions of the present invention, there is no need for acquiring and measuring the time difference of the ultra-high frequency partial discharge signals in the location process, the influence of interference signals caused by factors such as signal propagation path, signal refraction and reflection and the like is also avoided, the operation is convenient and flexible, and the locating is accurate.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

Disclosed are a method and an apparatus for forecasting a fault of a cable joint. The method for forecasting a fault of a cable joint comprises: acquiring local discharge of the position of the cable joint; acquiring a first local discharge value; judging whether the local discharge is greater than the first local discharge value; and if it is determines that the local discharge is greater than the first local discharge value, determining that the cable joint fails. The present invention improves the reliability of the cable.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

Disclosed are a mixed-mode temperature measurement communication phase conductor and a temperature measurement communication system. The mixed-mode temperature measurement communication phase conductor includes: a stainless steel sleeve optical fibre unit and a support wire stranded together with the stainless steel sleeve optical fibre unit, and an aluminium wire is stranded outside the stainless steel sleeve optical fibre unit and the support wire. The stainless steel sleeve optical fibre unit includes: a plurality of single-mode optical fibres and at least one multi-mode optical fibre, and the optical fibres in the stainless steel sleeve optical fibre unit are stranded with one another. By providing single-mode optical fibres for communication, and by measuring the temperature via a multi-mode optical fibre, the present invention realizes that whole-course temperature measurement can be performed on a conductor.

IPC Classes  ?

• H01B 11/00 - Communication cables or conductors
• H01B 5/10 - Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material
• H01B 9/00 - Power cables
• G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres

Abstract

Disclosed are a method and device for detecting electric power load forecasting accuracy. The method comprises: acquiring a historical load time sequence; performing time-frequency conversion on the data in the time sequence, so as to acquire frequency domain decomposition results; combining the frequency domain decomposition results according to periodicity, so as to obtain a low-frequency component and a high-frequency component; according to the historical load time sequence, the low-frequency component and the high-frequency component, determining historical load stability; and according to the historical load stability, judging whether the electric power load forecasting accuracy meets a preset condition or not. Because the historical load stability reflects the regularity of the load change of the area to a certain extent, it can be used as an evaluation standard of the electric power load forecasting accuracy, and then the corresponding electric power load forecasting accuracy can be determined according to the conditions of different areas.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply
• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"

Abstract

A metering circuit apparatus and a method for implementing metering. The apparatus comprises: an electricity meter (1), a combining unit (2), and a current transformer (3), wherein the current transformer (3) is connected to the combining unit (2) and the electricity meter (1), and is used for collecting electric quantities of intelligent substations, and inputting the electric quantities to the combining unit (2) and the electricity meter (1); the combining unit (2) is used for combining and synchronizing the electric quantities input by the current transformer (3), and forwarding a processed digital signal in a particular format; and the electricity meter (1) is used for charging for the electric quantities input by the current transformer (3). Requirements of regular metering and intelligent measurement are satisfied while no independent current transformer (3) is added.

IPC Classes  ?

• G01R 11/56 - Special tariff meters

Abstract

Disclosed in the invention are a method and a device for processing geological information. The method for processing the geological information comprises: acquiring multiple geological image graphs; determining the relations between the image coordinate and the ground coordinate of each of multiple geological image graphs by imaging means of geological image; and joining the multiple geological image graphs together according the relations between the image coordinate and the ground coordinate of each of multiple geological image graphs. The large-scale ground images can be obtained by processing the geological images according the present invention.

IPC Classes  ?

• G06T 7/00 - Image analysis