Analysis and Improvement of Grounding System for Energy Storage System

In the power system, the grounding system has the functions of stabilizing the voltage, providing the fault current discharge path, providing the reference potential. In this study, the relationship between the communication impact of equipment and the grounding method is discussed when the power conditioning system (PCS) of the energy storage system converts electric energy. For the problem of communication interruption between the monitoring equipment of the energy storage system, the literature search is carried out from the grounding part of the power system, and the possible causes and solutions are analyzed, and the ground potential changes of the energy storage system are analyzed through the system measurement to understand the problems of the grounding system.This research is divided into three parts. First, the modelling, analysis methods and system improvement directions of grounding system research in different fields are collected. Then, for the 100-kW energy storage system installed in our school, the ground potential changes during different switch operations are measured and analyzed. Finally, ground potential changes under different conditions are simulated according to the system grounding recommendations defined in the IEEE Standard.