Research On Control Of Energy Storage System In Industrial Park’s Hybrid Microgrid

As renewable energy sources such as photovoltaic power generation and wind power generation are connected to the power grid,the role of energy storage equipment in the power grid is becoming increasingly important.Aiming at the problem of power distribution of multienergy storage equipment and the low voltage gain of the converter,a high-voltage gain energy storage converter and energy storage SOC balance control strategy are proposed.The multistage structure is used to improve the converter voltage gain.The SOC balance control strategy of energy storage is designed for the state of charge and capacity of each battery,which realizes the high rate gain of the energy storage converter and the SOC balance control for the reasonable distribution of energy storage charge and discharge power.Firstly,this article describes the development of energy storage technology at home and abroad,and elaborates on the current development of energy storage technology.The key technologies of microgrid energy storage are analyzed.Based on the technical difficulties of microgrid energy storage,a solution to the technical problems was proposed.Secondly,the composition structure of the AC-DC hybrid microgrid in the park is described,and the structure description and control method design of AC microgrid energy storage and DC photovoltaic power generation are designed with AC microgrid and DC energy storage system respectively,and finally established A complete park hybrid microgrid model was established.Thirdly,in view of the limited voltage gain multiples of conventional energy storage converters,a high voltage gain energy storage converter is proposed.At the same time,its working mode,voltage gain,capacitor inductance selection and small signal model are calculated.And description.Finally,Simulink simulation was used to compare and verify the energy storage converter with high voltage gain.Then,in order to solve the charging and discharging power allocation problem of multiple energy storage devices,an energy storage SOC equilibrium control strategy is proposed.The equivalent circuit model of lithium battery is established,and the SOC equilibrium control strategy of energy storage is designed.This strategy allocates charge and discharge power according to the state of charge and capacity of each battery,so that the SOC of each battery tends to be consistent.Finally,the feasibility of the control strategy is verified by simulation analysis of Simulink.Finally,Simulink simulation and description of the park’s hybrid microgrid and energy storage system were performed to realize the normal operation of the park’s hybrid microgrid and energy storage system.At the same time,based on OPC’s dynamic link,a park hybrid microgrid simulation system was established to realize the data interaction between Simulink software and monitoring software,which improved the security and reliability of the park microgrid.