Design And Application Of Energy Storage Converter

In today's society,fossil energy sources are becoming increasingly depleted,and environmental pollution is becoming more and more serious.The integrated system of light and storage has become an inevitable development of the times.Energy storage converter is an important part of energy storage system,and it is of great significance to study it.This subject mainly studies the AC/DC energy storage converter based on LCL filter.First,the topology and operating principle of the AC/DC energy storage converter are introduced.The mathematical models of the three-phase stationary coordinate system,two-phase stationary coordinate system,and two-phase rotating coordinate system of the energy storage converter are introduced.The space vector control method is derived in detail.Then,the LCL filter on the AC grid side is designed according to the harmonic characteristics of the energy storage converter.On the basis of the filter capacitor series passive damping Rd method,the split capacitor passive damping R_d-C_d method is used to improve the damping effect and suppress the resonance spike.At the same time,the detailed steps of parameter design of LCL filter are given.Subsequently,a MATLAB/Simulink simulation model of the energy storage converter system is established.The simulation results show that the designed filter has a good function of filtering harmonics.Secondly,the control structure block diagram of the energy storage converter is given.The control strategies of grid-connected mode and island mode are analyzed,and a control system based on PI regulator is designed for different operating modes.The MATLAB/Simulink simulation model of the energy storage converter system is built.The simulation results show that the energy storage converter has good dynamic response in grid-connected mode and island mode,thereby verifying the correctness and design of the control strategy of the energy storage converter system.Effectiveness.After that,according to the requirements of the function and performance of the energy storage converter,the hardware and software of the main circuit and the control circuit of the energy storage converter are designed.The hardware mainly introduces the design of the main circuit module and the control module;the software mainly introduces the main program flowchart and interrupt flowchart of the designed energy storage system.Finally,according to the design scheme,an experimental prototype of an energy storage converter with a rated capacity of 500VA was built,and the effectiveness of the control strategy design and the correctness of the software and hardware of the designed energy storage converter were verified by the prototype platform.In addition,based on this prototype,an integrated storage and storage experiment platform was built.