摘要
利用储能系统稳定双极性直流母线电压并保证正负母线电压相等,首先研究了单台储能变换器的控制策略,分析该策略的调节性能。其次将多个储能模块并联接入直流母线组成分的布式储能系统,实现系统容量的扩增。针对并联储能模块间的功率分配问题,在此提出一种改进荷电状态(SOC)下垂控制策略。该策略通过构建下垂系数与储能模块SOC之间新的指数函数关系,使各储能模块在充放电过程中可以根据自身SOC实时调整输出或吸收功率的大小,实现并联储能模块间功率的合理分配。最后通过实验验证所提控制策略的可行性。
The energy storage system is used to stabilize the bipolar DC bus voltage and ensure the equal bus voltage.Firstly,the control strategy of a single energy storage converter is studied and its regulation capability is analyzed.Secondly,multiple energy storage modules are connected in parallel to a dc bus to form a distributed energy storage system,so as to realize the expansion of system capacity.An improved state of charge(SOC)droop control strategy is proposed for power distribution among parallel energy storage modules.By building a new exponential function relation between droop coefficient and SOC of energy storage module,this strategy realizes that the output or absorbed power of each energy storage module can be adjusted in real time according to its own state of charge and discharge,thus realizing the reasonable distribution of power among parallel energy storage modules.Finally,the feasibility of the proposed control strategy is verified by experiment.
作者
朱艳萍
阚志忠
梁梦娜
张纯江
ZHU Yan-ping;KAN Zhi-zhong;LIANG Meng-na;ZHANG Chun-jiang(Yanshan University,Qinhucuigdao 066004,China)
出处
《电力电子技术》
CSCD
北大核心
2019年第12期39-42,47,共5页
Power Electronics
基金
国家自然科学基金(51877187)
河北省自然科学基金(E2018203152,17214320)~~
关键词
变换器
直流微电网
分布式储能
下垂控制
converter
direct current microgrid
distributed energy storage
droop control
