Research On Control Strategy Of Energy Storage Inverter

With the continuous improvement of various energy storage devices,the response speed is faster and faster,the cycle life is longer and longer,the capacity is more and more big,the energy storage system is more and more important in the electric field.The further development of the micro grid can’t be separated from the development of the energy storage system,which is the core part ofthe energy storage system,it is a bridge between the energy storage device and the AC bus of micro grid.The research of energy storage inverter is of great significance to the development of energy storage system and micro grid.Firstly,this paper introduces the development background and trend of energy storage inverter,and briefly introduces several basic control strategies of micro grid and energy storage inverter.Then the topology of energy storage inverter is selected,establish the mathematical model of energy storage inverter in the three-phase static coordinate system,two-phase stationary coordinate system and two-phase orthogonal rotating coordinate system,and a brief analysis of the design of the controller,SPWM principle and single coordinate PLL.Based on analysis of the main circuit and related theory,firstly,introduced the PQ and VF control strategies of micro grid master-slave control,and put forward a new energy storage inverter grid and off grid seamless switching control strategy.Build a simulation model in the MATLAB/SIMULINK environment,The theoretical analysis is verified by simulation.Then introduces the droop control strategy of micro grid Peer to peer control strategy,the basic princple and characteristics of droop control are summarized,the operating state of the energy storage inverter based on droop control is analyzed in the case of off grid,grid connected and from grid connected to off grid,build simulation model in the MATLAB/SIMULINK environment to further analysis and verification.Finally,The hardware experiment platform of energy storage inverter control strategy based on TMS320F28335 control chip is build,introduces hardware design and software design process,the PQ、VF and seamless switching control strategy of energy storage inverter is verified.