562 results about "Black start" patented technology

The invention provides a hardware-in-the-loop simulation test method and device for a network construction type energy storage converter, and relates to the technical field of electric power grids. The network construction type energy storage converter is connected with the simulation energy storage system and the power grid simulation device, a hardware-in-the-loop simulation test system is constructed, and control parameters of the simulation energy storage system and the power grid simulation device are adjusted based on the simulation test system in combination with test types. Various types of hardware-in-the-loop tests and semi-physical tests such as fault ride-through tests, electric energy adaptability tests and black start tests are realized, and effective evaluation of the performance of the network-forming type energy storage converter is realized. According to the method, the problem of power grid oscillation caused by the fact that the network construction type energy storage converter is connected into the power grid for testing is avoided, the accuracy of the testing result of the network construction type energy storage converter is guaranteed, accurate capturing of performance parameters of different types of network construction type energy storage converters is achieved, and the testing effect of the network construction type energy storage converter is improved.

A black start system disclosed by the present invention comprises a first black start power supply, a black start power supply switch and a control system, the black start power supply switch supplies energy to the control system after being triggered by the first black start power supply, and the first black start power supply supplies energy through an energy storage battery; the invention discloses a micro-grid which comprises a power generation system and the black-start system, the invention also discloses a black-start method applied to the micro-grid, the black-start power supply triggers the black-start power supply switch and then supplies energy to the control system, and the power generation system is gradually started to the whole micro-grid. According to the invention, the energy storage battery is used as energy for black start, the characteristic that the energy storage battery performs electric quantity early warning to keep the lowest electric quantity and low electric quantity from the power grid for charging is utilized, stable and continuous energy can be provided for black start, and meanwhile, the situation that the energy storage battery is damaged due to the fact that the electric quantity of the energy storage battery is exhausted is avoided.

The invention relates to a wind power off-grid hydrogen production system and a control method thereof. The system comprises a wind driven generator, a black start power supply, an energy storage converter, a machine side converter, a grid side converter, a direct current bus capacitor, a first transformer, a second transformer, a third transformer, an AC-DC converter, a DC-DC converter, an electrolytic bath, a first switch, a second switch, a third switch and a fourth switch. The system comprises a black start mode, a normal operation mode and an emergency operation mode. In the black-start mode, the system is started from a closed state to an operating state through a black-start power supply; in the normal operation mode, the system power balance is maintained by adjusting the electrolysis power; in the emergency operation mode, the system power balance is maintained by adjusting the output power of the wind driven generator; according to the system, the flexible adjusting capacity of the load of the electrolytic cell can be fully explored, an energy storage device except a black-start power supply does not need to be additionally arranged, and wind power off-grid hydrogen production without energy storage can be achieved.

The invention provides a power system recovery method and system of a black-start power supply, a medium and electronic equipment. The method comprises the following steps: establishing a frequency-power response characteristic of cooperative work of a first preset unit and a second preset unit; according to frequency-power response characteristics of cooperative work, obtaining a target frequency response model of sudden load increase under power shortage; determining constraint conditions of the power system according to the target frequency response model; in combination with the target frequency response model, obtaining a target frequency response result of each black-start power supply to the power system when the black-start power supply is started; determining a plurality of power supply aggregation modes of each black-start power supply according to each target frequency response result in combination with a constraint condition; and determining an optimal recovery path of each black-start power supply under the shortest time consumption based on a shortest path algorithm and each power supply aggregation mode, so as to recover the power system according to the optimal recovery path. The problem that a black start method in the prior art is low in adaptability is solved.

The invention relates to the field of new energy technology and power electronics, and discloses a photovoltaic diesel generator energy storage hybrid off-grid and grid-connected household energy storage system, which comprises a data acquisition and state monitoring module for acquiring photovoltaic, diesel generator, energy storage, load and commercial power states in real time and generating system state parameters; the central control and decision module generates a control strategy containing an operation mode and an energy scheduling instruction; the energy flow and conversion execution module executes energy conversion and flow; the seamless switching control module realizes non-impact switching between modes; the self-adaptive safety protection module dynamically adjusts protection parameters; and the emergency response and recovery module executes black start and active recovery in an emergency state. According to the invention, through the unified central control and decision-making module, photovoltaic, diesel generator, energy storage and commercial power scheduling logics are integrated to form a collaborative energy management core, and the system can carry out global optimization on energy flow in grid-connected and off-grid modes according to a preset priority principle.

The invention relates to an off-grid parallel operation starting method of an energy storage system, the energy storage system and a storage medium, and belongs to the technical field of energy storage. The host receives the phase locking synchronization completion signal and sends a voltage unification instruction to the slave after determining that the grid-connected slave completes phase locking synchronization, and the host and the slave are boosted from the black start voltage to the rated voltage based on the voltage unification instruction to complete parallel start, so that fluctuation caused by unstable voltage in the start process of the slave can be improved; the stability of the energy storage system in the off-grid parallel operation process is improved; the slave is started after being synchronized according to the black start voltage phase lock phase established by the host, so that the output voltage after the slave is started is consistent with the output voltage of the host, the voltage consistency of the parallel energy storage current device is high, ring current caused by voltage difference can be reduced, and the operation efficiency of the system is improved; and the slave is started after successful phase locking, so that the risk of starting failure can be reduced.

The invention discloses a network construction type energy storage control method and system suitable for black start, and the method comprises the steps: obtaining a three-phase current actual value of a converter side to judge whether an overcurrent fault occurs or not, and switching off a pulse modulation signal of a switching device in a converter when the overcurrent fault is judged to occur; when it is judged that the overcurrent fault does not occur, a three-phase voltage instruction value, output by the power control loop, of the converter is obtained; obtaining a three-phase current actual value of the converter side, enabling the three-phase current actual value to sequentially pass through the virtual resistor and the high-pass filter to obtain a three-phase voltage compensation value, and obtaining a three-phase capacitance current actual value, corresponding to the three-phase voltage compensation value, in the high-pass filter; the difference value between the three-phase voltage instruction value and the three-phase voltage compensation value is used as a compensated three-phase voltage instruction value; and determining a pulse modulation signal of a switching device in the converter according to a difference value between the actual value of the three-phase capacitance current passing through the damping coefficient and the compensated three-phase voltage instruction value. Wave sealing control is applied, fault current limiting is achieved, and the stability of a power grid is improved.

A method and system for performing blackstart functionality from renewable generation and battery energy storage systems are disclosed. A plant may include a microgrid that includes one or more customer loads and that may provide power to a utility grid. Blackstart may be performed to restore operations to part or all of the plant or to external loads such as microgrid customer loads or part of the utility grid. In practice, blackstart may be performed in order to restore operation to the one or more feeders in the plant, such as to the generation sources within the plant, to restore power to the plant auxiliary loads, customer loads in the microgrid, and to provide power to different sections of the grid when transitioning from shutdown mode of operation. In this way, the method and system may automatically transition from a shutdown mode of operation to an islanded mode of operation.

The invention provides a wind turbine generator black start control method, device and equipment and a storage medium, and the method comprises the steps: starting an energy storage system under the condition that a wind power generation system loses voltage; controlling the energy storage system to supply power to an auxiliary power supply transformer of the wind power generation system; a converter of the wind power generation system is started, and an energy storage system is controlled to provide control electricity for the converter; obtaining the DC bus voltage of the converter; and controlling the converter to enter a voltage frequency control mode under the condition that the direct current bus voltage meets a preset condition. According to the application, the mainstream bus voltage is established through the energy storage system, the wind turbine generator is enabled to enter the black start state, and the converter is controlled to enter the voltage frequency control mode, so that the wind turbine generator has an ad-hoc network operation capability, can autonomously construct the power grid voltage and frequency, and can stably operate and generate power externally.

The invention discloses an AI multi-agent layered hierarchical emergency response system supporting an elastic power grid, and relates to the technical field of substation power response, the AI multi-agent layered hierarchical emergency response system comprises a global situation awareness module, a regional autonomous control module and an equipment toughness execution module, the global situation awareness module integrates multi-source disaster monitoring information, establishes a disaster chain deduction model, and sends the disaster chain deduction model to the regional autonomous control module; quantifying regional disaster intensity and generating a risk map; the regional autonomous control module extracts a high-risk region to divide a balanced island, realizes second-level splitting and black start through an intelligent agent, and constructs an autonomous stability coefficient to evaluate the stability of the island; and the equipment toughness execution module identifies a potential fault area, drives an intelligent agent to dynamically reconstruct a power grid topology, links distributed energy to perform differential energy supplementation according to a load gap, and calculates a recovery speed coefficient to judge the core load recovery quality. The system improves disaster pre-judgment precision and emergency response efficiency, ensures reliable power supply of medical and industrial core loads, and enhances disaster resistance elasticity of a power grid.

The invention relates to the technical field of operation control of a wind storage system, and discloses a black-start power control method and device for a network-forming type wind storage system and a medium. By adopting a robust model predictive control optimization method, the output power of the wind storage system can be adaptively adjusted on line according to the change of a black-start load; the supply and demand balance of the active power is maintained, and stable and rapid black start is realized. Meanwhile, the power change of the following grid type photovoltaic power in the black start process is regarded as uncertain disturbance, and the change is estimated through the constructed disturbance observer state equation, so that the accurate tracking of the power of the grid construction wind storage system is improved, the response speed is high, the method does not need to depend on the accurate prediction of the photovoltaic power, and the control accuracy is improved.

The invention provides a new energy island flexible direct output system and a black start method thereof, and the system comprises a transmitting end connection transformer, a transmitting end converter valve, a direct current line, a receiving end converter valve, a starting resistor, a bypass isolation knife, a receiving end connection transformer, and an energy storage device. The energy storage equipment is connected in parallel to the low-voltage winding side of the receiving end connection transformer, and the receiving end connection transformer is configured to be a multi-winding connection transformer. According to some embodiments, the energy storage equipment is configured in the receiving end converter station and is directly connected in parallel to the low-voltage winding side of the multi-winding connection transformer, so that a multi-stage boosting transformer is omitted, and the energy storage access mode is effectively simplified. When the new energy island is isolated from the receiving end alternating current power grid through the flexible direct output system, the energy storage device can control and maintain the alternating current side voltage of the receiving end converter station. After black start of the system is completed, voltage and frequency support can be provided for a receiving end alternating current power grid.

The invention discloses an off-grid new energy hydrogen production start control method, system, device and medium, and relates to the technical field of new energy hydrogen production control and micro-grid operation management, and the method comprises the steps: employing energy storage zero-to-boost control and anti-interference communication to establish a bus voltage based on an off-grid system architecture; the output power of the wind turbine generator is adjusted through a variable pitch power following strategy based on short-term wind speed prediction, the power distribution proportion of the wind turbine generator and the energy storage device is dynamically adjusted by adopting an improved NSGA-II multi-target optimization algorithm in combination with the equipment health state factor, and the power output path and the response rate of the equipment are optimized; electrolytic hydrogen production is carried out by adopting electrolytic tank pre-starting condition inspection, stepped power rising and stepped starting of grid-connected transition in cooperation with closed-loop temperature flow regulation and a PID pressure management strategy, and black-start rollback and self-healing control are executed. According to the method, the stable construction of the bus voltage is realized through the boost control from zero energy storage, and the current impact in the starting process is effectively inhibited.

The invention provides a wind generating set, a differential speed regulation device and a control method thereof, the wind generating set comprises the differential speed regulation device, a multi-port converter and an electro-magnetic synchronous generator, and the differential speed regulation device comprises a permanent magnet motor, a differential planetary gear train, a quasi planetary gear train and a speed regulation motor. A permanent magnet motor rotor is connected with a differential planetary gear train planet carrier, and a speed regulating motor rotor is connected with a quasi planetary gear train sun gear. The differential planetary gear train sun gear drives the electro-magnetic synchronous generator rotor to operate at a first preset rotating speed. One port of the multi-port converter is connected with the permanent magnet motor stator, one port is connected with the speed regulation motor stator, and the other port is connected with the electro-magnetic synchronous generator rotor through the slip ring. According to the differential speed regulation device, variable-speed input, self-energized speed regulation and constant-speed output are achieved, and the differential speed regulation device is compact in overall structure, small in size and light in weight; the black start can be realized without taking power from a power grid; and the electro-magnetic synchronous generator is directly connected to the grid, so that the power grid supporting capacity is high.

The invention discloses a direct black-start method and system for a grid-forming type permanent magnet direct-drive wind turbine generator, and the method comprises the steps: starting a rotor-side converter, accelerating a permanent magnet direct-drive fan to a given rotating speed, continuously charging a direct current side when the rotating speed rises until a rated voltage is reached, and maintaining the capacitor voltage of the direct current side through machine-side control; a grid-side converter is started, and inertia support is provided for the system through control of the virtual synchronous machine; a load is accessed, and a virtual synchronous machine and a linear active-disturbance-rejection technology are combined to improve the stability of a network construction type system. According to the method, the autonomous frequency and voltage supporting capacity of the direct-driven wind turbine generator are improved, the direct-driven wind turbine generator can independently serve as a black-start power supply to participate in power grid black-start, and the black-start process can be effectively achieved for a regional power grid lacking a conventional black-start power supply.

The invention relates to a new energy power plant black-start capability evaluation method, which comprises the steps of determining evaluation indexes for evaluating the black-start capability of a new energy power plant, including a continuous output capability index, a black-start voltage regulation capability index, a frequency modulation capability index, a frequency modulation time index and a virtual inertia index; obtaining the value of each evaluation index of the new energy power plant to be evaluated, and constructing a standardized evaluation matrix; and based on the standardized evaluation matrix, adopting an entropy weight fuzzy comprehensive evaluation method to evaluate the black-start capability of the to-be-evaluated new energy power plants, and realizing sorting of the black-start capabilities of the plurality of to-be-evaluated new energy power plants. According to the invention, on the basis of seasonal historical data of the new energy power plant, a black-start capability evaluation index system based on seasonal characteristics of the new energy power plant is constructed. And the lack of research on the black-start capability evaluation scheme of the new energy power plant in the prior art is made up. The method can meet the demand of off-line evaluation, and is suitable for industrial application.

The invention relates to the technical field of power grid energy storage control, and particularly discloses a network construction type energy storage system and a control method thereof, and the system comprises a parameter collection module which obtains the voltage, frequency, short-circuit capacity ratio, phase angle and other power grid operation parameters of a grid-connected point in real time; the scene recognition module judges the power grid scene of the energy storage system according to the acquired parameters, wherein the power grid scene comprises a weak power grid scene, a fault scene, an oscillation scene, a phase angle jump scene and a power loss scene; the strategy library module stores control strategies for each scene, including active / reactive control, active / reactive decoupling, overload support, low-frequency oscillation suppression, phase angle stabilization and black start strategies; and the adaptive control module retrieves and calls a corresponding strategy from a strategy library according to an identification result, performs adaptive control on the energy storage system, and realizes intelligent response and stable support for a complex power grid environment. According to the invention, intelligent response and stable support of the energy storage system to a complex power grid environment are effectively realized.

The invention relates to the technical field of power electronic application, and discloses a gas turbine black start system and method based on a high-voltage direct-hanging energy storage converter, and the system comprises the high-voltage direct-hanging energy storage converter, a static start frequency converter, an excitation system, a diesel generator, a gas turbine, a bus, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, an output reactor L1 and a grid-connected reactor L2, the high-voltage direct-hanging energy storage converter is composed of a high-voltage direct-hanging energy storage converter control system, a plurality of energy storage power units and a grid-connected reactor L2, and the static starting frequency converter is composed of a split transformer, a rectification loop, a direct-current loop, an inversion loop, an output reactor L1 and a static starting frequency converter control system. According to the invention, the problem of starting failure caused by unstable power supply of the static starting frequency converter is solved, and the influence of power side harmonic waves, voltage sag, power fluctuation and the like of the static starting frequency converter on the starting process in the black-start process of the gas turbine is effectively reduced.

The invention discloses an energy storage type SOP black-start method, system and device based on improved VSG network construction control and a medium, and relates to the field of power grid black-start, and the method comprises the steps: an energy storage type converter MMC carries out the active and reactive control based on an improved VSG network construction control strategy; a non-fault side MMC is controlled to firstly close an isolation circuit breaker and slowly charge a direct-current capacitor, and when the voltage reaches a set threshold value, a current-limiting resistor is quitted; the fault side MMC is started by the same step as the non-fault side MMC; after synchronization is completed, AC circuit breakers between the non-fault side MMC and the feeder load and between the fault side MMC and the feeder load are closed respectively; based on the collected power grid power data, MMC output parameters are adjusted to meet the power grid connection condition, the control mode is switched according to the grid connection state, and the black start process is ended. And by arranging the black start resistor for current-limiting charging and sub-module voltage balance control, the phenomena of overcurrent and voltage unbalance in the black start process are avoided.

The invention relates to the technical field of power system black start, and discloses a black start method and system based on a bipolar LCC-HVDC, and the method comprises the steps: entering a DC system black start stage, starting a bipolar LCC-HVDC system through an ice melting simulation mode, and the bipolar LCC-HVDC system comprises two heat exchanger groups at a sending end and two heat exchanger groups at a receiving end; and entering a load recovery stage, improving the output power of the direct current system, accessing a load, and transitioning to a normal operation state of two-stage forward transmission to complete black start of the receiving end power grid. Based on a bipolar reverse transmission mode and a special control mode of a converter, the bipolar LCC-HVDC system has voltage source characteristics at the initial stage of black start, so that the bipolar LCC-HVDC system can provide voltage and frequency support for a passive power grid at a receiving end; a black start strategy of the bipolar LCC-HVDC system based on AC / DC system characteristics when a receiving end is in a power failure state; the invention discloses a strategy for supporting load recovery of a bipolar LCC-HVDC system based on alternating current and direct current system characteristics.

The invention provides a dual-mode parallel competition-dominated self-synchronizing voltage source centralized photovoltaic system and method, and the method comprises the steps: generating an internal potential first frequency through the control of active power, and generating an internal potential second frequency through the control of DC voltage; the first internal potential frequency and the second internal potential frequency are input into the dual-mode parallel-competition dominant module to generate internal potential frequency and phase angle; the internal potential amplitude is generated through dual control of the grid-connected point voltage and the reactive power, and the internal potential amplitude is adjusted by the internal potential amplitude limiting control module so as to deal with the transient fault of the power grid. According to the control method, the centralized photovoltaic inverter can be freely and smoothly switched in two working modes of maximum power tracking control and limited power control, and the centralized photovoltaic inverter has voltage source characteristics of an autonomous synchronization power grid, autonomous damping power grid frequency and voltage fluctuation, transient fault lower limit current active support, black start and the like in a full operation mode.

The invention provides a method and equipment for optimizing a black-start recovery path of a new energy power system containing network construction type energy storage, and the method considers the fluctuation of the output of a new energy unit, and carries out the black-start optimization modeling of the system after the network construction type energy storage is connected to a bus of the new energy unit. The method comprises the steps of obtaining prediction data of new energy unit output in a new energy power system containing network construction type energy storage, and constructing a black-start network construction resource constraint condition and an operation constraint condition considering the network construction type energy storage system; based on the network construction resource constraint condition and the operation constraint condition, taking minimization of user power failure loss as a target function, and constructing a new energy power system black-start optimization model containing network construction type energy storage; and solving the new energy power system black-start optimization model containing the network construction type energy storage to obtain a power system black-start recovery path. According to the method, the black-start characteristic of network construction type energy storage and the fluctuation characteristic of new energy power generation are considered at the same time, and finally optimization of the black-start recovery path of the power system is achieved.

The invention relates to the technical field of electric power system operation optimization, and discloses a black-start optimization method, system, device and medium for a novel electric power system.The method comprises the steps that the initial operation state of the novel electric power system is determined through a Monte Carlo method so as to construct a black-start optimization model; generating a training sample set according to the initial operation state and the black-start optimization model; training an artificial intelligence model based on a neural network through the training sample set, and resetting an integer variable of the black-start optimization model by using the trained artificial intelligence model so as to take a reset result as an initial condition; and adding the initial condition into the black-start optimization model as an additional constraint, and solving to obtain a black-start recovery strategy of the novel power system for execution, thereby improving the calculation efficiency of the existing black-start model, and ensuring the stability and safety of the operation of the energy storage system at the same time.

The embodiment of the invention provides a black-start control method, an energy storage device and an energy storage system. The performance of the energy storage system can be effectively improved. The black-start control method is applied to the energy storage system, the energy storage system comprises an energy storage device, the energy storage device comprises a plurality of battery clusters, a first controller and a black-start on-off device, and the black-start on-off device is arranged between a target battery cluster in the battery clusters and the first end of the first controller. The method comprises the steps that in response to a black start demand of the energy storage system, the first controller performs black start on the energy storage system based on the target battery cluster, and the black start on-off device is in a closed state; and after the black start, the first controller controls the black start on-off device to be switched from a closed state to an off state.

The invention discloses a synchronous control method for improving a multi-machine black-start frequency phase angle coupling effect, and aims to improve the black-start recovery capability. The system adopts a parallel recovery strategy, so that a plurality of black-start micro-sources are started at the same time, and synchronization is quickly realized. However, the requirement of parallel recovery on the precision of pre-synchronization is extremely high, and due to the fact that in the pre-synchronization process before parallel connection and brake connection, the frequency and the phase angle have a coupling relation, and the rapid change of the phase angle difference in phase angle control easily causes frequency overshoot. In order to solve the problem, the system introduces a linear active disturbance rejection control (LADRC) method on the basis of traditional phase angle control, fast adjustment is made when frequency fluctuation is caused by phase angle difference change by means of high interference resistance and dynamic response speed, and phase angle change becomes more stable and controllable through timely and stable control of frequency, so that the system is more stable and controllable. Therefore, the interference on the frequency is reversely reduced, and the weakening of the frequency phase angle coupling effect is realized. The design not only ensures the rapidity of black start, but also improves the stability and recovery capability of the system.

The invention discloses a network construction type matching control strategy for integrated energy management in a black-start scene, and relates to the field of energy storage system network construction control, and the strategy comprises the following steps: S1, an energy storage system supplies power through a transformer; s2, limiting the impact current generated by the transformer in the power supply process through an inverter; s3, energy storage system load power is provided through an energy storage battery and a direct current side capacitor; s4, the three-phase voltage amplitude, frequency and phase angle of the grid-connected point are obtained, difference calculation is carried out on the three-phase voltage amplitude, frequency and phase angle of the grid side, and the difference is limited within a threshold value through pre-synchronization; s5, closing and grid connection are carried out after pre-synchronization is completed, the power grid and the energy storage system supply power at the same time, the direct-current side capacitor is charged, and the rated voltage is recovered; a net-forming type energy storage system is adopted as a black-start power supply, a matching control strategy is adopted, an energy management function is integrated, inertia and damping are flexibly provided for the energy storage system, and the pressure of an energy storage battery serving as the black-start power supply under extreme conditions is relieved.

The invention provides a DRU system based on a blocking type auxiliary current converter and a starting method of the DRU system. The DRU system comprises a shore current converter, an offshore rectifier and an offshore auxiliary current converter. The starting method comprises four stages. A V / f control strategy is adopted for activating a shore converter control system and a blocking type auxiliary converter, and an offshore alternating-current power grid is established; the chopper circuit is triggered, and the circuit breaker is safely disconnected by using a zero-current switching technology; the offshore wind plant quits the low-voltage ride-through mode, and starting of the DRU system is completed; according to the invention, by introducing the blocking type auxiliary current converter and combining the DRU and the main current converter, black start and stable operation of the wind field are realized; moreover, the system has the characteristics of quick response and high reliability, can quickly establish AC voltage in the starting stage, and provides required starting energy for the wind turbine generator. The auxiliary converter can provide reactive power support and harmonic suppression during normal operation of a wind field, and the stability and efficient operation of the system are ensured.

The invention provides a micro-grid black start recovery optimization method and device based on adaptive Benders decomposition, and the method comprises the steps: providing a Benders two-stage solving algorithm fused with an adaptive penalty factor for the hierarchy and constraint complexity of a micro-grid black start two-stage optimization model. In the first optimization stage, a micro-source recovery sequence and a recovery path are optimized based on a Benders decomposition method of an adaptive penalty factor, and in the second optimization stage, load recovery is optimized in combination with mixed integer programming. According to the method, the precision of the optical storage model is improved through dynamic characteristic correction, the recovery efficiency and stability are balanced through a two-stage framework, the solving performance is improved through an adaptive algorithm, and efficient and safe recovery of black start of the micro-grid is effectively achieved.

According to the standby power system and the starting control method thereof provided by the invention, when the grid-connected and off-grid controller is powered off, the first control circuit provides the low-level signal to the second control circuit of the inverter as the off-grid signal, so that when the voltage of the direct current side of the inverter meets the condition of the starting voltage value of the inverter, off-grid black start is preferentially carried out, and the starting time of the inverter is shortened. And after starting is completed, off-grid operation outputs alternating current voltage to quickly supply power to a standby power load. And if the inverter detects that the voltage of the alternating current side meets the condition of the minimum off-grid output voltage value and receives a high-level signal as a grid-connected signal before the inverter is started in an off-grid mode to output the alternating current voltage, the inverter can be directly switched to be started in a grid-connected mode, and rapid starting is completed. When the voltage of the power grid meets the under-voltage protection voltage value condition, the grid-connected and off-grid controller can be directly started in a grid-connected mode to run in a grid-connected mode, the first switching circuit is closed, a high-level signal is sent to serve as a grid-connected signal, power is rapidly supplied to the standby power load, and meanwhile voltage is provided for the alternating current side of the inverter.

The invention relates to the technical field of power system operation monitoring and control, and provides a coordination control method of a wind storage combined black-start power supply based on inertia response. According to the method, a wind generating set and a flywheel energy storage system are configured to be black-start power supplies, a virtual inertia time constant and a power demand are calculated by monitoring power grid frequency deviation in real time, and the flywheel array action depth is determined. The power output of the flywheel array is controlled by adopting a hierarchical control strategy, the charging and discharging state of the wind storage system is adjusted according to the frequency change, the SOC state of the flywheel energy storage system is monitored in real time, and the SOC is balanced by utilizing a Nash bargaining solution negotiation algorithm. In the black-start process, the power output of the wind storage system is dynamically adjusted according to the frequency, and the two cooperate to maintain the power grid frequency stable. The method effectively solves the problems of power grid black start and frequency stability under the high proportion of new energy power generation, prevents energy storage from being overcharged and overdischarged, improves the power grid black start success rate and operation stability, and promotes the efficient utilization of new energy.