289 results about "Black start" patented technology

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 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 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 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 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 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 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.

The invention discloses a computational analysis method applied to high-power power electronic networking equipment, and relates to the technical field of power systems. According to the method, broadband power grid impedance, equipment state and device working condition data are acquired through a sensing layer, and accurate input is provided through layered compression and priority transmission; the cooperative calculation layer introduces a power grid impedance correction coupling interference matrix, establishes an electrothermal coupling loss mapping relation, and realizes coupling interference quantification, loss real-time calculation and full life cycle prediction; the linkage optimization layer constructs a multi-objective optimization function, an optimal control parameter is solved through an efficient algorithm, and a segmented execution strategy is adopted to adapt to different working conditions; the closed-loop feedback layer collects operation feedback data, dynamically updates the model and optimizes the weight, and links fault black-start support and optimal power supply recovery path planning. According to the invention, multi-target collaborative optimization of system stability, operation efficiency, equipment service life and power supply reliability is realized, and technical support is provided for large-scale safe and efficient operation of high-power networking equipment.

The application provides an energy storage system and a black start device. The energy storage system comprises a battery cluster and a black start bus. The battery cluster comprises a plurality of battery packs connected in series. A target battery pack in the plurality of battery packs carries a black start control. The black start control is used to turn on an electrical connection between the target energy storage battery and a target auxiliary power supply when triggered. The target auxiliary power supply is used to supply power to a target controller and the black start bus based on the electrical energy provided by the target energy storage battery, so as to trigger the black start bus to supply power to the auxiliary power supplies of other battery packs. The auxiliary power supplies in the other battery packs are used to turn on the electrical connection with the energy storage batteries based on the electrical energy provided by the black start bus, and supply power to the controllers based on the electrical energy provided by the energy storage batteries. By using the application, the problems of poor starting experience, high cost and low reliability caused by the fact that all battery packs need to be installed with black start controls can be avoided. In addition, the power supply power of the UPS is reduced when the black start is performed through the UPS, and the cost of the black start is significantly reduced.

The invention proposes a power plant black-start unit monitoring and fault early warning method, and the method comprises the steps: deploying a sensor array at a key part of a unit through a high-precision sensor network, constructing a neural network model through an LSTM deep learning algorithm based on collected key state data, carrying out the modeling analysis of multi-dimensional time series data, and carrying out the early warning of a fault of the unit. The method comprises the following steps: acquiring a dynamic characteristic mode of a unit operation state, reconstructing a characteristic vector into a two-dimensional characteristic graph by combining a CNN convolutional neural network, performing fault mode identification, acquiring a potential fault type and risk level assessment, and establishing a dynamic threshold adjustment mechanism by adopting an adaptive threshold fault diagnosis algorithm based on the fault type and risk level assessment. And abnormal state determination is carried out, and accurate fault early warning signals and disposal suggestions are obtained. According to the method, the data processing capacity and the system expansibility are improved, the prediction model and the optimization model are constructed through the big data analysis technology, scientific selection and starting time sequence arrangement of the black-start unit are achieved, and the success rate and reliability of black-start are improved.

The invention discloses an energy storage black-start load identification method based on dynamic response and related equipment, and aims to solve the technical problem of high secondary collapse risk of a system caused by blind closing and power transmission of an unknown load in an energy storage black-start process in the prior art. According to the method, before formal switching-on power transmission, customized safety test pulses are generated through a pulse parameter model according to physical parameters of a power line, and dynamic response signals of loads are collected and analyzed, so that prospective recognition of the health states of the loads is achieved. According to the method, the load recovery in the energy storage black start is changed from blind closing to a controllable process of first diagnosis and then power transmission, so that the risk of secondary collapse of the system due to fault load access is fundamentally reduced.

The invention belongs to the technical field of power system recovery control, and discloses a power coordination control method of a hybrid energy storage auxiliary black-start system and a related device.According to the method, the total active power requirement of the black-start system is obtained and decomposed into three time scale components of fundamental waves, intermediate frequencies and high frequencies; the power is dynamically distributed to the lithium battery and the super capacitor, the distributed power is corrected based on the temperature, the operation time and the rated parameters, and finally the frequency change rate and the direct-current voltage change rate are calculated according to the actual power instruction and the system parameters so that the controller can output the control quantity. By adopting the method, the contradiction between the energy and the power density of a single power supply is overcome, the response speed and the continuous power supply capability are synergistically improved, the voltage frequency instability risk caused by load input is effectively inhibited, and the reliability and the high efficiency of black start are remarkably improved by perfecting hybrid energy storage coordination control.

The invention belongs to the technical field of direct-current power transmission of a power system, and provides a large-scale new energy cluster black-start steady-state control method and system, and the method comprises the steps: unlocking a receiving-end MMC when the capacitor voltage of a half-bridge sub-module is consistent with the capacitor voltage of a full-bridge sub-module, and unlocking a sending-end MMC after the charging of all sub-module capacitors is completed, the DC voltage of the sending end MMC is adjusted based on the cooperative control of the new energy unit and the sending end MMC, when the DC voltage is adjusted to 0, the DC voltage is adjusted to 1.05 p.u. Based on the receiving end hybrid MMC, the diode uncontrolled rectification is successfully input, the DC voltage is adjusted to a rated value from 1.05 p.u. Based on the receiving end MMC, the power of the new energy station is increased, and the power of the new energy station is increased. And black start is completed until the large-scale new energy cluster sending-out topology recovers normal operation, the sending-end hybrid MMC operates at constant zero direct-current voltage by adjusting the alternating-current voltage amplitude of the new energy station, and black start steady-state control is completed.

The invention relates to the technical field of intelligent power grid protection, and particularly discloses a safety protection system and method for a network-forming type energy storage power grid, and the system comprises a power grid state monitoring unit which collects the voltage, frequency, short-circuit capacity ratio (SCR), phase angle and other parameters of a grid-connected point in real time. And the cooperative control unit generates an operation mode control instruction and a power scheduling instruction based on the operation strategy model, and realizes switching between a network construction mode and a network following mode and primary frequency modulation, AGC and AVC power scheduling. When receiving an instruction or monitoring disturbance, the transient response execution unit performs inertia support, fault ride-through, oscillation suppression, black start support and other operations, and maintains voltage and frequency stable. And the digital intelligent security protection unit performs full-state monitoring on a physical environment, network information and an equipment operation state, and executes an active protection strategy to ensure safe, stable and reliable operation of the system. According to the invention, the safety, the stability and the reliability of the network-forming type energy storage power grid are effectively ensured.

The invention relates to the technical field of electric power engineering, and provides a black-start control system for offshore wind power direct current transmission and a control method thereof.In the system, a receiving-end alternating current breaker is used for controlling connection and disconnection between a receiving-end power grid and an onshore converter station, so that the receiving-end alternating current breaker is connected with the onshore converter station in a black-start instruction; charging control is carried out on the converters in the land converter station and the offshore converter station at the same time through the receiving end power grid based on a preset charging control strategy; and the sending-end alternating-current circuit breaker is used for controlling connection and disconnection between the offshore wind power plant and the offshore collection bus, so that after charging control is finished, system full-operation starting control is executed based on a preset full-control starting strategy through the offshore converter station and the land converter station until the offshore alternating-current wind turbine generator of the offshore wind power plant recovers power output. According to the invention, under the condition that the cost advantage of the VSC and DR combined topology is brought into full play, reliable and stable starting of the passive offshore wind power direct current sending-out system is realized based on a black-start mechanism combining uncontrolled-half-controlled charging with full-controlled starting.

The invention relates to a black-start capability evaluation method and system for a network construction type new energy and energy storage device. Detecting fault nodes of the power grid according to the real-time running state of the power grid; and reconstructing a power grid topological graph according to the fault nodes. In the reconstruction of the power grid topology, calculating a recovery priority score of a load node, and calculating the real-time output capability of each new energy and energy storage device; and converting the reconstructed power grid topological graph into a weighted graph to restore the priority, the output capability and the path cost of an intermediate node, and correcting the edge weight and the node weight of the weighted graph. Based on the corrected weighted graph, searching a black-start path and deploying the black-start path in a simulation environment to execute simulation; and recording the operation data of each new energy and energy storage device in each simulation process, and evaluating the black-start capability of a single device. The method can accurately reflect the actual connectivity and operation constraint when the power grid is powered off, and provides black-start capability evaluation closer to the real operation condition for each new energy and energy storage device.

The invention discloses a power supply system for an energy storage power station based on an energy storage black-start function, and belongs to the technical field of energy storage power stations. The system comprises an energy storage power station grid-connected bus, a station transformer, an energy storage unit and a station power supply system. One side of the energy storage power station grid-connected bus is connected with a power grid, and the other side is respectively connected with the high-voltage side of the station transformer and the energy storage unit; the station power supply system is connected with the low-voltage side of the station transformer and the energy storage unit; when the station transformer operates normally, the station transformer supplies power to the station power supply system; when the station transformer does not operate normally, the energy storage unit supplies power to the station power supply system. Double-loop power supply of the power supply for the energy storage power station is realized, so that the power supply reliability and stability of the energy storage power station are improved, and the effect and advantages of the energy storage power station in a power grid are exerted.

The invention belongs to the technical field of electric power systems and intelligent charging control, particularly relates to a flexible power autonomous adjusting system for an alternating current charging pile area of an electric vehicle, and aims to solve the problems of area overload and voltage out-of-limit caused by high-density charging loads. The system collects operation parameters in real time through the zone area state sensing unit, drives the charging pile group control execution unit to implement hierarchical adaptive power regulation by combining equipment safety, user service and network topology multi-dimensional weight dynamic evaluation through the local decision calculation unit, and supports black-start protection and multi-zone-area cooperative regulation and control. Millisecond-level response and edge autonomy are realized, power grid safety is guaranteed, and charging experience is optimized.

The invention discloses an expansion generator set system and method for black start of a compressed air energy storage power station. The expansion generator set system is mainly composed of an air expansion machine, a generator, a starting valve, a hydraulic control valve, an anti-wear hydraulic oil pump, an anti-wear hydraulic oil tank, a speed change gear box and various pipelines. The air expansion machine can selectively and directly drive the generator and the anti-wear hydraulic oil pump, and can output mechanical work to the generator and the anti-wear hydraulic oil pump after speed change of the speed change gear box. Rotor supports of the expansion machine, the generator and the oil pump all adopt rolling bearings, so that lubricating oil station configuration is eliminated or related power consumption is reduced. The rotating speed of the expansion generator set can reach 90% when the starting valve is fully opened in the impulse rotating process, and the hydraulic control valve connected with the expansion generator set in parallel needs to be used for precise and quick response control of the rotating speed and the power required by follow-up grid connection. The black start requirement of compressed air energy storage power stations of 100 MW and higher power levels can be met, and the whole machine is simple in structure, high in reliability and easy to maintain.

The invention relates to a black-start method and device for self-synchronizing parallel connection and stable control of a new energy station, and the method comprises the steps: controlling each power generation unit of the new energy station to carry out the initialization through the DC side energy storage of the power generation unit in response to a black-start instruction, and generating the voltage and frequency of an independently-established island of the new energy station; performing self-synchronization among the power generation units based on the island voltage and frequency, and performing oscillation suppression on the parallel connection process of the power generation units by using adjustable virtual impedance so as to establish a stable parallel power generation unit system; the impedance of the power generation unit system is monitored online in real time, virtual impedance parameters are adjusted in a self-adaptive mode according to a preset impedance stability criterion, and loads are input step by step; and when the voltage difference and the frequency difference in the gradual load input process are smaller than a preset threshold condition, a parallel circuit breaker in the new energy station is controlled to be closed so as to realize black start.

Disclosed in the present invention are a power transmission network emergency repair and restoration method and device based on a mobile power supply. The present application improves the power transmission network fault restoration efficiency by the method: reading a preset power transmission network black start strategy optimization model and parameter data acquired from a power transmission network to be restored, wherein the power transmission network black start strategy optimization model is constructed by setting an emergency repair resource constraint, a power transmission network operation constraint and a power transmission network partition constraint, with the optimization objective of minimizing power transmission network load loss; initializing the power transmission network black start strategy optimization model on the basis of the parameter data, and solving the power transmission network black start strategy optimization model by means of a solver to obtain a mobile power supply arrangement scheme and a unit restoration scheme of said power transmission network; and performing emergency repair on said power transmission network on the basis of the mobile power supply arrangement scheme and the unit restoration scheme. The present application can improve the power transmission network fault restoration efficiency and reduce power outage costs by allocating fault repair resources.

The invention relates to a multi-mode compressed air energy storage power grid support method. The method comprises the following steps: step 1, constructing a multi-mode operation mode of a compressed air energy storage system composed of four basic operation modes including a peak regulation mode, a frequency modulation mode, a standby power supply mode and a black start mode; 2, power grid operation state parameters are collected in real time; 3, based on the power grid operation state parameters, a preset mode switching criterion is combined, and a target operation mode needing to be adopted at present is dynamically judged; 4, generating a corresponding control strategy; 5, in the process of executing the control strategy, the states of the power grid and the system are continuously monitored, the control strategy is adjusted in real time or switching of the operation modes is triggered according to feedback information, and closed-loop optimization operation is achieved. Meanwhile, the invention further discloses a control system. The compressed air energy storage system can support the power grid in all directions, and the stability, economical efficiency and reliability of the power grid are improved.

The invention relates to the technical field of microgrid guarantee supply, and discloses a staged dynamic balance control method for realizing independent guarantee supply of a microgrid. According to the method, a state matrix is constructed based on real-time operation data, the operation stage of the micro-grid is judged, and corresponding logic is executed; in the black-start stage, the voltage frequency is reconstructed by taking grid construction type energy storage as a reference; in the island stage, a mutual aid optimization and multi-objective optimization model is adopted to maintain power dynamic balance; and synchronous tracking and smooth switching are executed in the grid connection stage. Through full-life-cycle staged accurate management and control, the problems that black start of the micro-grid is difficult and mode switching is not smooth are effectively solved, the power supply reliability is guaranteed, meanwhile, economical efficiency and power are complemented, and the stability and robustness of the system are remarkably improved.

The application discloses an off-grid new energy hydrogen production starting control method, system, equipment and medium, relates to the technical field of new energy hydrogen production control and micro-grid operation management, and comprises the following steps: adopting energy storage zero step-up voltage control and anti-interference communication to establish bus voltage based on an off-grid system architecture; adjusting wind turbine output power based on a short-term wind speed prediction variable pitch power following strategy, adopting an improved NSGA-II multi-objective optimization algorithm to dynamically adjust the power distribution ratio of the wind turbine and the energy storage device in combination with the equipment health state factor, and optimizing the equipment power output path and response rate; adopting electrolytic cell pre-starting condition checking, power step-up and grid-connected transition step starting, cooperating with closed-loop temperature flow regulation and PID pressure management strategies to carry out electrolytic hydrogen production, and executing black start fallback and self-healing control. The method disclosed by the application realizes smooth construction of bus voltage through energy storage zero step-up voltage control, and effectively suppresses current impact in the starting process.

The invention discloses a black-start control method for an offshore direct-current wind turbine generator with an energy storage power supply, and relates to the technical field of black-start of wind turbine generators, which comprises the following steps of: supplying power to each auxiliary system of the wind turbine generator by using the energy storage power supply connected to a direct-current bus side; the master control system issues a variable pitch instruction; the rotating speed of the dragging motor is increased, black start is started, a master control issues a starting instruction and a variable pitch instruction of a machine side converter, bus voltage is started to be established, and blades of the wind turbine generator set are subjected to variable pitch to the minimum pitch angle beta min; when the rotating speed of the dragging motor reaches Rrpm, the holding time is T1, the bus voltage reaches Uref, the holding time is T2, and the establishment of the bus voltage is completed; starting power generation operation; and the unit charges a self energy storage power supply for next use. No additional power supply equipment is needed under the condition that the wind power plant loses power, black start is completed through the self energy storage power supply of the unit, and the problem that the far-sea wind power plant loses power and cannot provide power for the equipment can be solved.

The invention discloses a black-start method for an energy storage system of a new energy power station. The method comprises a normal black-start mode and a low-electric-quantity black-start mode. Before black start, all converters of the energy storage system are traversed; when a state of charge (SOC) value of a battery connected with at least one converter in the energy storage system is greater than a threshold value, executing a normal black-start mode; and when the SOCs of all the converters in the energy storage system are smaller than a threshold value, executing a low-electric-quantity black-start mode. According to the method, the starting sequence of the converters is preferentially selected, and the photovoltaic inverter is automatically started and the power of the photovoltaic inverter is limited in the black-start process to assist the energy storage system to establish stable voltage and frequency, so that the black-start success rate of the energy storage system is improved.

The invention relates to the technical field of generator set black start, and discloses a multi-generator set black start control system, method, device, medium and product, the multi-generator set black start control system comprises a plurality of generator sets, each generator set comprises a new energy power supply, an energy storage converter, a local load and an active branch; the new energy power supply is connected with the energy storage converter through the DC bus, the local load is connected with the energy storage converter, and the local load is connected with the active branch in parallel; the energy storage converter is used for outputting reference voltage for a local load; and the control module is used for selecting a target generator set, controlling the closing of a target active branch of the target generator set, controlling the disconnection of active branches of other generator sets, and returning to the step of selecting the target generator set until a second stable state is reached. And frequency fluctuation generated during black-start grid-connected closing of the multiple generator sets is reduced.

The invention relates to the technical field of compressed air energy storage power station black start, in particular to a compressed air energy storage power station black start system, method, equipment and medium, and the compressed air energy storage power station black start system comprises an energy conversion module which is used for converting high-pressure gas energy in a gas storage medium into electric energy; the electric energy distribution module is connected with the output end of the energy conversion module and used for distributing electric energy to the plant load; the power supply switching module is connected with the electric energy distribution module and an external power supply and is used for realizing switching of power supplies; the dynamic adjusting module is connected with the energy conversion module and the electric energy distribution module and used for controlling and maintaining stable operation of the system through gas flow. The method has the beneficial effects that the potential of the high-pressure gas in the gas storage chamber of the energy storage power station and the energy storage equipment is fully utilized, the equipment cooperative starting logic and the rapid operation process of the plant power are optimized, the reliability and efficiency of black start are improved, and the stable supply of the plant power is ensured.

The invention provides a station service power recovery control method based on a generator set, and relates to the technical field of black start of photovoltaic power stations, and the method comprises the steps: obtaining the operation data and access process of core equipment according to an emergency plan, and evaluating the actual station service power recovery capability of the generator set according to the impact on the generator set in the access process. The method comprises the following steps: selecting a photovoltaic panel subsystem which preferentially recovers operation according to the impact possibly caused by each photovoltaic panel subsystem on a generator set and a value coefficient of power supply recovery of the photovoltaic panel subsystem, and enhancing the power supply capability of the generator set by the photovoltaic panel subsystem which recovers operation, thereby recovering all station service power. The hidden danger that the generator set collapses due to the access impact of equipment is avoided, and the plant power recovery capability of a power plant is enhanced.

The application provides a voltage imbalance treatment method and system for a micro-grid black start process under an unbalanced load, comprising the following steps: S1, determining that the focus point for treating voltage imbalance of a three-phase three-wire inverter is to eliminate negative sequence voltage; S2, introducing a mathematical model describing a two times power frequency oscillation disturbance signal characteristic generated by the negative sequence voltage into a control loop; and S3, using a proportional integral control method combined with a quasi-resonant controller to suppress the two times power frequency oscillation component in the control loop, so as to realize negative sequence voltage suppression and voltage imbalance treatment. The application analyzes the mechanism of voltage imbalance problems of the three-phase three-wire inverter under various unbalanced loads, and reveals that the focus point for treating voltage imbalance problems is to eliminate negative sequence voltage.