| With the continuous development of green energy technology,global energy consumption and environmental pollution problems have found a solution.The solar energy storage operation can improve the micro-grid operation of the power supply time,power failure occurs in large power grid can maintain the power.supply.the user is no longer affected by the power supply intermittent energy supply,micro-grid has the advantages of intensive use of renewable energy The research on the control strategy of the energy storage system can make people make full use of renewable energy,and it has many advantages in maintaining the stable operation of the system and ensuring that the quality of the power used by the users are up to standard.At the same time,there are shortcomings such as energy intermittent problems,power instability problems and voltage fluctuation when the state is switched.Therefore,the effective control of the energy storage system in the micro-grid makes the various links in the system cooperate with each other,and the smooth operation of the micro-grid system and the smooth switching of each state are becoming an urgent problem.Firstly,this article introduces the research background and significance of the microgrid system,the research and application value of nowadays microgrid system and the microgrids research status and current situation at home and abroad.Then it would present the microgrid system from three aspects:the definition,structure and characters..Based on our PV microgrid project as the experimental platform,this article mainly studies the control method of PV microcomputer energy storage and variable flow system,and completes the modeling and simulation experiment on matlab/simulink.This article first introduces the research background of microgrid system,points out the practical significance of microgrid development in China,expounds the research value and significance of microgrid system,and explains the basic research status of PCS and energy storage equipment in energy storage system.Secondly,through the research of energy storage and converter system,the topology of PCS and the main function of energy storage converter are introduced.According to the working characteristics of bidirectional converter,the topology of three-phase voltage rectifier circuit is selected.At the same time,the topology of several non-isolated and isolated DC-DC circuits is compared and the advantages and disadvantages of the circuit are analyzed.Then,according to the definition of the physical quantity in the PCS main circuit,the mathematical model of PCS AC side and DC side synchronous coordinate system is established.Thirdly,the control strategy of bidirectional energy storage converter is studied,and the typical operation control strategies of PQ?V/f and Droop are studied.In this article,the algorithm is used in the energy storage and variable flow control system,and the simulation model is built in matlab/simulink.The simulation results are based on the simulation results.And the control algorithm is effective to ensure the power balance,frequency and voltage stability of the micro-network system.The control,power stability and smooth switching of the stable operation of the energy storage system are realized.Finally,the article summarizes and prospects.Based on the droop control algorithm,the perturbation matrix optimization algorithm is introduced to realize the smooth switching of the off-grid and grid-connected operation of the micro-network system,and the stability of the micro-network operation is maintained. |
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