Research On Multi-motor Parallel Control Strategy For Two-way Energy Storage Inverter

In the microgrid,distributed power mainly includes photovoltaic panels,wind power generation,energy storage batteries,super capacitors,etc.The distributed power supply is connected to the microgrid to ensure that when the load of the grid is low,the AC power on the power grid is converted into DC energy charges the battery pack.In the peak load period of the power grid,it can convert the DC power of the battery pack into AC power that meets the grid requirements and feeds it back into the public power grid.This function cuts the peaks and fills the valley and ensures the power grid.normal operation.To achieve this function,bidirectional energy storage inverters play a vital role.The main research contents of this article are as follows:1)Several common inverter topologies are introduced,and a typical voltage-mode three-phase inverter topological structure is selected for research,and circuit analysis and mathematical modeling are established.On this basis,the bidirectional inverter's rectifier circuit and inverter circuit are studied,and the working principle of the bi-directional inverter is analyzed.2)This dissertation discusses the control strategy of a single inverter.The common inverter control strategies such as PQ control strategy,V/F control strategy and droop control strategy are briefly introduced,and the voltage loop control and current loop control of V/F control strategy are analyzed and designed,using matlab/simulink to build The simulation model verifies the feasibility of the control strategy.3)This dissertation analyzes the parallel operation system of inverters.Firstly,the circuit analysis of the mathematical model of the parallel operation of the inverter is carried out,and the reasons for the circulation of the parallel system are analyzed.Then the inverter parallel operation control strategy is introduced.The master-slave control strategy is analyzed and designed.According to the system circulation,an improved control strategy based on virtual impedance is proposed,and a simulation model is built to verify the proposed control strategy.Finally,a qualitative analysis of the entire energy storage system was performed.The working principle of the energy storage battery and the super capacitor in the energy storage system was introduced,and the topological structure of the energy storage system was analyzed.