基于下垂控制的直流微网多储能系统研究

摘要

With the development of microgrid and energy storage technology,multiple energy storage in the application of microgrid is more and more widely,however,in the process of discharging,the differences of SOC between the different energy storage units will make part of battery quit running ,this will lead to the decrease of the system stability. For this problem,the SOC—I droop control method to control multiple energy storage units on coordination was put forward,the SOC—I droop control method of the controller was designed by analyzing the relationship between energy storage SOC values and the discharge current I,eventually the controller power of energy storage is coordinated and make the charged state(SOC)of energy storage units consistent,improve the stability of the microgrid system.%随着微电网与储能技术的发展,多储能系统在微电网中的应用越来越广泛,然而多储能系统在放电过程中,不同储能单元之间的荷电状态(SOC)差异会导致部分电池提前退出放电,这将降低系统运行的稳定性.针对此问题,提出一种SOC—I下垂控制方法对微网中多储能单元进行协调控制,通过分析储能SOC值与放电电流I的关系,设计SOC—I下垂控制方法的控制器,最终协调分配各储能单元输出功率,使储能之间的荷电状态(SOC)达到一致,提高微电网系统的稳定性.