Abstract

The present invention relates to the technical field of flue gas evaporation. Disclosed is a boiler flue gas evaporation device for high-concentration wastewater at a power plant. The boiler flue gas evaporation device comprises a base, above which an evaporation mechanism, a recovery mechanism, a treatment mechanism, a drain pipe, a wastewater injection pipe, a gas guide pipe and a wastewater flow guide pipe are provided; and four positioning bases are fixedly connected to an outer surface of the base. By means of the cooperative arrangement of the evaporation mechanism and the recovery mechanism in the boiler flue gas evaporation device, the evaporation rate can be effectively increased, and also, waste heat of evaporated wastewater is recycled, thereby effectively avoiding the wasting of waste heat of wastewater during evaporation of the wastewater by means of heating, effectively increasing the resource utilization rate, and thus avoiding resource waste.

IPC Classes  ?

• C02F 1/04 - Treatment of water, waste water, or sewage by heating by distillation or evaporation

Abstract

A thermal power plant wastewater zero-discharge nonlinear mathematical programming system, comprising a monitoring module (200), a central processing module (100), a remote monitoring module (300) and a sewage treatment module (400). The monitoring module (200) is used for acquiring detection data of each detection sensor installed in the sewage treatment system (400) of a thermal power plant, and sending the detection data to the sewage treatment module (400). The sewage treatment module (400) is used for receiving the detection data sent by the monitoring module (200), performing data processing on the detection data and then displaying same, and wirelessly transmitting the display content to the remote monitoring module (300); and receiving and executing a user instruction sent by the remote monitoring module (300). The remote monitoring module (300) is used for receiving the display content sent by the sewage treatment module (400), and sending the display content to a mobile device of a user; and receiving the user instruction sent by the user, and sending the user instruction to the sewage treatment module (400). According to the system, the sewage treatment monitoring efficiency of the sewage treatment plant is improved, and the labor cost is reduced.

IPC Classes  ?

• C02F 9/14 - Multistep treatment of water, waste water or sewage at least one step being a biological treatment
• C02F 1/00 - Treatment of water, waste water, or sewage
• G06F 17/10 - Complex mathematical operations
• G07C 1/10 - Registering, indicating, or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity

Abstract

A water-saving expected cost input-based water-saving and emission reduction mathematical solving system for a thermal power plant, comprising a monitoring platform (100) and a water treatment system (200). The monitoring platform (100) is connected to the water treatment system (200); the water treatment system (200) comprises a first water treatment unit, a second water treatment unit, a third water treatment unit, and a fourth water treatment unit that are successively connected in a water treatment sequence, and is used for performing zero-emission treatment on water and wastewater in a thermal power plant; and the monitoring platform (100) comprises a data processing module (120), a model calling unit (130), a mathematical solving model (140), and a data transceiving module (110). The system is provided with the monitoring platform (100) and the water treatment system (200); according to basic data of industrial wastewater, a water-consuming unit, and a water treatment process, etc., of the thermal power plant, problem solving is performed by using reasoning strategies in combination with some factual rules, so as to form a decision scheme for step-by-step utilization, recycling, and final zero-emission of wastewater.

IPC Classes  ?

• G06Q 10/06 - Resources, workflows, human or project managementEnterprise or organisation planningEnterprise or organisation modelling
• G06Q 50/06 - Energy or water supply
• C02F 9/10 - Thermal treatment

Abstract

A method for reusing circulating water sewage as desulfurization process water. The method comprises the following steps: step I, collecting and storing circulating water sewage; step II, pretreating the circulating water sewage to obtain pretreated sewage; step III, dividing the pretreated sewage into a plurality of parts according to the types of water used by a desulfurization system, and respectively introducing same into corresponding treatment pools for treatment, so as to obtain classified treated sewage; step IV, subjecting the classified treated sewage to water quality testing, and proceeding to step V if same passes testing, or proceeding to step II if same fails; and step V, subjecting the classified treated sewage to classified storage. The method can realize classification treatment according to different types of desulfurization water in a desulfurization system, and supplement missing water to the desulfurization system in a timely manner when the desulfurization system is used, such that the circulating water sewage is recycled, waste of water resources is avoided, and the water costs of the desulfurization system is reduced.

IPC Classes  ?

• C02F 9/04 - Multistep treatment of water, waste water or sewage at least one step being a chemical treatment

Abstract

A zero discharge system for wet-desulfurization wastewater in a thermal power plant, the system comprising a tank body (1), a fixing frame (2), a blower (22), and a flocculation reaction disk (23). The fixing frame (2) is fixedly connected to the top of the tank body (1), an electric motor (3) is fixedly connected to the top of the fixing frame (2), an axially extending end of the electric motor (3) is fixedly connected to a driving shaft (4), a metal pipe (5) is arranged on each of a left side and a right side of the driving shaft (4), spray heads (8) are mounted at the lower ends of the metal pipes (5), a three-way water pipe (9) is arranged above the fixing frame (2), a sleeve (11) is arranged inside the tank body (1), a lead screw (14) is arranged inside the sleeve (11), a movable plate (18) is further arranged inside the sleeve (11), the blower (22) is mounted on a left side wall of the fixing frame (2), the flocculation reaction disk (23) is mounted at the bottom of the tank body (1), bottom wastewater is flocculated by providing the blower (22) and the flocculation reaction plate (23), cyclic spraying is achieved by providing the sleeve (11), the movable plate (18) and rotatable spray heads (8), such that a spraying range is expanded, and a contact area between the wastewater and a flocculant is increased, which allows full contact between the wastewater and the flocculant to improve flocculation reaction efficiency.

IPC Classes  ?

• C02F 1/52 - Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
• C02F 103/18 - Nature of the water, waste water, sewage or sludge to be treated from the wet purification of gaseous effluents

Abstract

A quality-based treatment method for industrial wastewater of a power plant. The method comprises the following steps: storage, flow division, quality-based treatment, mixing treatment, coagulation, flocculation, separation, final neutralization, and wastewater measurement of industrial wastewater of a power plant. By means of classifying different types of pollutants in industrial wastewater for treatment, harmful substances in the industrial wastewater can be rapidly and effectively reduced, the pollutants in the wastewater are recycled one by one for reuse, and mixing treatment is performed on the wastewater from which the pollutants have been removed, thereby improving the safety of wastewater discharge.

IPC Classes  ?

• C02F 9/04 - Multistep treatment of water, waste water or sewage at least one step being a chemical treatment

Abstract

Disclosed are a desulfurization wastewater zero-discharge device and system, comprising a horizontal falling film evaporator for concentration and crystallization of desulfurization wastewater. A steam box and a condensation box are respectively installed on the left side and the right side of the horizontal falling film evaporator, and a plurality of heat exchange tube bundles are provided between the steam box and the condensation box. The heat exchange tube bundles are positioned inside the horizontal falling film evaporator, and the two ends of each heat exchange tube bundle are respectively in communication with the steam box and the condensation box. A liquid inlet pipe is installed at the top of the interior of the horizontal falling film evaporator, and a plurality of spray heads are installed on the liquid inlet pipe in a linear direction. By means of the arrangement of a desulfurization wastewater pretreatment module, a desulfurization wastewater concentration module, a desulfurization wastewater crystallization module and a fixed waste treatment module, zero-discharge treatment of desulfurization wastewater is achieved. Compared with existing technical solutions, the present invention has the technical characteristics of being convenient to repair and maintain, has low construction installation requirements, high adaptability to scaling type water quality, low investment costs and occupies little space.

IPC Classes  ?

• C02F 9/10 - Thermal treatment
• C02F 1/04 - Treatment of water, waste water, or sewage by heating by distillation or evaporation
• B01D 1/22 - Evaporating by bringing a thin layer of the liquid into contact with a heated surface
• C02F 103/18 - Nature of the water, waste water, sewage or sludge to be treated from the wet purification of gaseous effluents

Abstract

Disclosed is an evaporation and concentration device simulating the meteorological environment, comprising an evaporation and concentration device, wherein a baffle is vertically mounted inside the evaporation and concentration device, the baffle divides the inside of the evaporation and concentration device into a waste water tank and a condensed water tank, and the upper parts of the waste water tank and the condensed water tank are in communication with each other via a vapor passage; and the evaporation and concentration device is in communication with a liquid discharge pipe at the upper part of the waste water tank, the evaporation and concentration device is provided with a spraying mechanism at the upper part of the waste water tank, and the spraying mechanism is in communication with the liquid discharge pipe. In the present invention, heated waste water is introduced into the spraying mechanism from the liquid discharge pipe, and the waster water is sprayed into the waste water tank through the spraying mechanism, during the waste water spraying process, water vapor flows upwards and enters the condensed water tank through the steam passage, waste liquid flows into the bottom of the waste water tank, the water vapor is condensed and converges into a water flow, which is stored at the bottom of the condensed water tank, thereby simulating the meteorological environment of water evaporation and rainfall in a sealed environment and subjecting the waste water to evaporation and concentration treatment.

IPC Classes  ?

• C02F 1/04 - Treatment of water, waste water, or sewage by heating by distillation or evaporation
• C02F 1/12 - Spray evaporation

Abstract

Disclosed is a forced circulation mechanical vapor compression device, comprising a heat exchanger, a vapor compressor and a circulation pump. A liquid inlet is provided at the lower part of the vapor compressor and is used for introducing waste water into the vapor compressor. A liquid inlet end of the circulation pump is in communication with the bottom of the vapor compressor via a liquid discharge pipe, and a liquid discharge end of the circulation pump is in communication with the heat exchanger. A liquid outlet pipe is in communication with the top of the vapor compressor, the liquid outlet pipe is in communication with the input end of the vapor compressor, and an output end of the vapor compression end is in communication with the heat exchanger via a first gas inlet pipe. In the present invention, waste water is introduced into the vapor compressor via the liquid inlet, and is mixed with waste water which is being circulated; the vapor is introduced into the vapor compressor via the liquid outlet pipe, is introduced into the heat exchanger after being pressurized, and is condensed into distilled water in the heat exchanger; after the vapor is gradually discharged, the waste water is concentrated and crystallized, and the concentrated wastewater and the crystals are discharged by means of the circulation pump, so that not only the concentration efficiency is high, but also the running energy consumption is low.

IPC Classes  ?

• C02F 1/04 - Treatment of water, waste water, or sewage by heating by distillation or evaporation
• C02F 9/02 - Multistep treatment of water, waste water or sewage involving a separation step

Abstract

Disclosed in the present invention is a forced circulation evaporator for the sewage treatment of a fossil fuel power plant, comprising: a gas-liquid separator, a tubular heat exchanger, and a circulating pump. A steam inlet, a material feed port, a material discharge port, and a condensate water discharge port are respectively formed on the outer side of the tubular heat exchanger; a material pipe and a heating pipe are provided inside the tubular heat exchanger; the material pipe is communicated with the material feed port and the material discharge port, respectively; the heating pipe is communicated with the steam inlet and the condensed water discharge port, respectively; the material discharge port is communicated with the interior of the gas-liquid separator through a liquid feed pipe; a material downflow port is formed at the bottom of the gas-liquid separator; the material downflow port is communicated with a material discharge pipe; and a liquid feed end of the circulating pump is communicated with the material discharge pipe, and a liquid discharge end of the circulating pump is communicated with the material feed port through a circulating pipe. The present invention performs multiple heating and gas-liquid separation on a raw material solution, and is suitable for the evaporation and concentration in industries such as chemical engineering, food, pharmacy, environmental protection engineering, and waste liquid evaporation recovery concerning fouling, crystallinity, high concentration, high viscosity, and insoluble solids.

IPC Classes  ?

• C02F 1/04 - Treatment of water, waste water, or sewage by heating by distillation or evaporation

Abstract

A method for evaluating the mechanical state of a high-voltage shunt reactor based on vibration characteristics is disclosed, relating to the technical field of electrical equipment fault diagnosis. The method includes: based on historical state data and real-time vibration and noise signal data of the high-voltage shunt reactor and through an LSTM neural network time series prediction method, comparing deviation between predicted characteristic value and actual characteristic value, and determining whether the high-voltage shunt reactor has mechanical defects or failures. By using the historical state data and the real-time vibration and noise signal data of the high-voltage shunt reactor, an LSTM neural network time series prediction method, as well as comparison of the deviation between the predicted characteristic value and the actual characteristic value, etc., the evaluation of the mechanical state of the high-voltage shunt reactor is realized.

IPC Classes  ?

• G06N 3/0442 - Recurrent networks, e.g. Hopfield networks characterised by memory or gating, e.g. long short-term memory [LSTM] or gated recurrent units [GRU]
• G01H 1/00 - Measuring vibrations in solids by using direct conduction to the detector
• G06N 3/048 - Activation functions

Abstract

A method for evaluating a mechanical state of a high-voltage shunt reactor on the basis of a vibration feature, relating to the field of fault diagnosis technology for electrical devices. Said method is based on historical state data and real-time vibration noise signal data of a high-voltage shunt reactor, compares, by means of an LSTM neural network time sequence prediction method, a deviation between a predicted feature value and an actual feature value, measures whether a mechanical defect or fault occurs in the high-voltage shunt reactor, and comprises: S1, acquiring a vibration signal and a noise signal of the high-voltage shunt reactor, and performing data preprocessing; S2, establishing an LSTM neural network model and configuring parameters; S3, using the LSTM neural network to predict a fundamental frequency amplitude value of the signal; and S4, comparing the deviation between the predicted feature value and the actual feature value, etc, and using a comprehensive deviation factor to evaluate the mechanical operation state of the high-voltage shunt reactor.

IPC Classes  ?

• G01M 7/02 - Vibration-testing
• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G06N 3/04 - Architecture, e.g. interconnection topology
• G01M 13/04 - Bearings
• G01N 29/00 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic wavesVisualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object

Abstract

A full-automatic closed-loop detection method and apparatus for an intelligent substation. The method comprises: comparing an SCD file of a tested substation with a device type data template file, so as to determine whether configuration information of the tested substation is correct (101); when it is determined that the configuration information of the tested substation is correct, parsing the SCD file of the tested substation, and generating an SSD topological diagram of the tested substation (102); and obtaining a test item from a preset test item library according to the SSD topological diagram of the tested substation, and generating a test solution of the tested substation and performing item testing, and outputting the test result (103). The solution resolves the problem of low visualization level due to failure to automatically make a test solution in an existing closed-loop detection test for an intelligent substation.

IPC Classes  ?

• G06Q 10/10 - Office automationTime management
• 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

The fully-automatic closed-loop detection method includes: comparing a SCD file of a to-be-tested substation with a device-type data template file, so as to determine whether configuration information about the to-be-tested substation is correct; when the configuration information about the to-be-tested substation is correct, parsing the SCD file of the to-be-tested substation and generating a SSD topological diagram of the to-be-tested substation; and acquiring a testing item from a predetermined testing item library in accordance with the SSD topological diagram of the to-be-tested substation, generating a testing scheme for the to-be-tested substation, performing a testing operation and outputting a testing result.

IPC Classes  ?

• G01R 31/317 - Testing of digital circuits
• H04L 12/40 - Bus networks
• H04L 12/00 - Data switching networks
• G01R 31/34 - Testing dynamo-electric machines

Abstract

A system for staring a large-scale power load in a micro grid comprises a PCC grid connection switch, a micro grid alternating-current bus, an active power filter (APF), an energy storage inverter, an energy storage battery, a current-limiting resistor R, contactors K1-K3, a time relay KT, a power supply relay board, a micro grid maser control system, a frequency converter rectifying circuit, a frequency converter filter circuit, and a frequency converter inverter circuit. There are the advantages: an output torque of a power load can be effectively improved by using a variable frequency starting apparatus, and a starting current is also small; the provided method can effectively reduce a harmonic current when a variable frequency starting apparatus starts a power load, the phenomenon that two power sources supply power on a direct-current side of the variable frequency starting apparatus at the same time is avoided, thereby improving the stability and the economy of a micro grid.

IPC Classes  ?

• H02J 1/00 - Circuit arrangements for dc mains or dc distribution networks
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02M 1/12 - Arrangements for reducing harmonics from AC input or output
• H02M 7/04 - Conversion of AC power input into DC power output without possibility of reversal by static converters
• H02M 7/44 - Conversion of DC power input into AC power output without possibility of reversal by static converters

Abstract

An anti-islanding method and device for a distributed power source of a direct-current electric distribution network. The method comprises: inject an alternating voltage component to an output end of an AC/DC interface converter, the frequency of the alternating voltage component being less than a working frequency; sample first voltage signals of the output end of the AC/DC converter; extract a first effective value of an alternating-current signal in the first voltage signals; compare the first effective value with a first preset voltage value; and an islanding phenomenon occurs on the distributed power source when it is determined that the first effective value is less than the first preset voltage value, and control the distributed power source to stop working. By determining whether the alternating voltage component exists on the output end of the AC/DC converter, whether the distributed power source needs to stop operation is determined. If the alternating voltage component does not exist on the output end of the AC/DC converter, the distributed power source is controlled to stop operation, and whether the islanding phenomenon exists can be determined accurately in a timely manner.

IPC Classes  ?

• H02J 1/00 - Circuit arrangements for dc mains or dc distribution networks
• 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

An electric energy meter automatic verification production line device maintenance method. The method comprises the following steps: obtaining an unavailability U of a device according to a failure count of the device and a repair time for each failure; calculating to obtain an impact level F of the device on the production line; calculating to obtain a daily maintenance priority level coefficient P of the device; ranking devices according to the daily maintenance priority level coefficient P; setting a maximum threshold value and a minimum threshold value of the daily maintenance priority coefficient P; and finally determining the device maintenance method. The method applies a scientific basis to a daily maintenance plan for an electric energy meter automatic verification production line device; thereby, manpower and material resources are saved while the device reliability degree is improved, improving the quantity of electric energy meters verified and reducing the device maintenance cost.

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)

Abstract

A transformer internal composite defect fuzzy diagnosis method based on gas dissolved in oil, comprising: a step of acquiring monitoring data of volume concentrations of five types of monitored feature gas; a step of determining ratio codes; a step of modifying a three-ratio method; a step of fuzzifying a boundary range; a step of calculating probabilities of the ratio codes; a step of calculating a probability of occurrence of each defect fault; and finally obtaining a fault type of a transformer. The method has the beneficial effects that: the method is simple and easy to achieve, and particularly suitable for being applied to an on-line transformer state monitoring system; based on a concept of fuzzy logic, diagnosis of composite defects of the transformer under a complicated state and evaluation of the degree of severity can be achieved, and the problem of sudden change caused by criterion boundary absolutisation can be effectively avoided; and multi-feature information such as an attention value and a ratio of the gas dissolved in the oil are merged and analysed, thereby effectively improving the diagnosis reliability.

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 simulation test device for a mutual inductor of an LTE wireless communication intelligent substation comprises a simulation master station, a first LTE wireless transceiver module, a second LTE wireless transceiver module, a distributed data terminal and a power amplification circuit, and has the advantageous effects of being convenient to carry and assemble and widely applicable to field installation and debugging tests, outage maintenance tests and technical performance evaluation for substations. Near-end experimental equipment is respectively arranged by the side of field equipment disposed at different intervals and is connected with far-end equipment in an LTE private wireless local area network mode, and there is no need for debugging staff to carry optical fibers; the running state of most of the electric power systems can be accurately simulated, and the working condition of secondary equipment for protection, measurement and control and the like is inspected; and meanwhile, a plurality of interval correlation protection, measurement and control devices are connected, so that a complete test for the secondary system of the whole substation is achieved and field workflow is optimized.

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
• 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 system for staring a large-scale power load in a micro grid comprises a PCC grid connection switch, a micro grid alternating-current bus, an active power filter (APF), an energy storage inverter, an energy storage battery, a current-limiting resistor R, contactors K1-K3, a time relay KT, a power supply relay board, a micro grid maser control system, a frequency converter rectifying circuit, a frequency converter filter circuit, and a frequency converter inverter circuit. There are the advantages: an output torque of a power load can be effectively improved by using a variable frequency starting apparatus, and a starting current is also small; the provided method can effectively reduce a harmonic current when a variable frequency starting apparatus starts a power load, the phenomenon that two power sources supply power on a direct-current side of the variable frequency starting apparatus at the same time is avoided, thereby improving the stability and the economy of a micro grid.

IPC Classes  ?

• H02J 3/02 - Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequenciesCircuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of ac power and of dc power

Abstract

Disclosed is a method for determining a dynamic overload curve of a transformer based on operating data, comprising: A, based on basic configuration information of a transformer, performing basic configuration of overload curve calculation to adapt to transformers of different types and different cooling manners; B, reading real-time operating data of the transformer, and completing preparation of the real-time operating data of the transformer; C, calculating a cooling capacity of the transformer and an initial cooling capability of the transformer; D, analyzing a history load trend of the transformer, and predicting a future load of the transformer; E, calculating thermal limit time of the transformer based on a winding hot point temperature of the transformer; F, based on an initialized overload capability table of transformer components, modifying the thermal limit time of the transformer; G, using a Bezier grid to perform fitting on a load curve, and completing determination of a dynamic overload curve graph of the transformer. The dynamic overload curve graph of the transformer generated according to the present invention can provide a scientific and effective reference for load control.

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 pressure control system for simulated transformer device insulating oil, comprising: a circulation pump (1), a circulation magnetic valve (2), an oil inlet magnetic valve (4), an oil return magnetic valve (7), an oil cylinder (6), and an oil outlet magnetic valve (8); the system also comprises a gas inlet magnetic valve (3), a gas outlet magnetic valve (5), a pressure sensor (9), a compressed air source (16), and a pressure controller (17); the upper portion of the oil cylinder (6) is an oil chamber with an oil inlet hole (18), and the lower portion of the oil cylinder (6) is a gas chamber provided with an air outlet (13) and an air inlet (14); a through hole is provided in the axial position of the piston rod of the oil cylinder (6); the pressure sensor (9) is embedded at the bottom of the gas chamber; the compressed air source (16) communicates with the air inlet (14) via a pipe installed with the gas inlet magnetic valve (3); the air outlet (13) communicates with a pipe installed with the gas outlet magnetic valve (5); and the pressure controller (17) communicates, via a Bluetooth or a USB, with a host computer installed with control software. The system measures gas chamber pressure by using the pressure sensor (9) so as to automatically control the opening and closing of each magnetic valve, thus responding quickly and stabilizing the pressure of the oil cylinder.

IPC Classes  ?

• G05D 16/20 - Control of fluid pressure characterised by the use of electric means

Abstract

Disclosed are an alternating current-direct current hybrid micro-grid system and a control method therefor. The system comprises photovoltaic assemblies, inverters, a direct-current converter, storage batteries, a super-capacitor, an alternating-current load, a direct-current load, a direct-current bus, an alternating-current bus, an SVG, an APF, and the like. The control method comprises the steps of: first detecting the voltage and frequency of a main grid, and if normal, the system adopting grid-connected operation, or else, adopting isolated island operation; if the system is in grid-connected operation, the inverters all adopting PQ control and the direct-current converter adopting constant voltage control, and if the system is in isolated island operation, an energy storage inverter with the maximum capacity and the super-capacitor adopting V/F control, the remaining inverters adopting PQ control and the direct-current converter adopting constant voltage control; and finally under the premise of ensuring the normal operation of the system, ensuring that the energy storage capacity is within an optimal range. The present invention solves the operation control of a typical alternating current-direct current hybrid micro-grid system, improves the reliability, safety and economic efficiency of the system, and improves the utilization efficiency of renewable energy sources.

IPC Classes  ?

• H02J 3/02 - Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequenciesCircuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of ac power and of dc power
• H02J 5/00 - Circuit arrangements for transfer of electric power between ac networks and dc networks