摘要
为改善传统的平均电流均流法动态响应差、直流母线侧电压随输出线阻变化的缺陷,实现直流微电网中并联运行的储能系统中电流的平均分配,提出一种基于均流环、电压环、电流环的三闭环结构改进平均电流均流法,给定电流来自微网中负载所需功率。该文分析传统平均电流均流法的原理,提出三闭环结构的改进平均电流均流法,建立双向DC-DC并联运行储能系统模型,结果表明改进平均电流均流法比传统方法动态响应快,并可保证直流母线侧电压稳定在理想值。
To improve poor dynamic response of the basic average current scheme,avoid DC-bus-side voltage varying with output line resistance,and realize current sharing of parallel energy storage system in DC microgrid,a modified average current scheme is proposed.This scheme uses three closed-loop structure,which includes a current-sharing loop,a voltage loop and a current loop.The given current is from the power required by load in DC microgrid.In this paper,we analyze defects of the basic average current scheme,propose a modified average current scheme,and build a model of parallel energy storage system with DC-DC converters in MATLAB/Simulink to verify the feasibility and effectiveness of the proposed scheme.Results show that under the proposed scheme,the system has good current-sharing effect and fast dynamic response.And when considering output line resistance,the DC-bus-side voltage can still stabilize at the ideal value.
作者
陈薇
黄钰笛
李鑫
张微微
狄那
Chen Wei;Huang Yudi;Li Xin;Zhang Weiwei;Di Na(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第5期83-90,共8页
Acta Energiae Solaris Sinica
基金
2017年国家重点研发项目(2017YFB0903504)
2016年湖南省科技重大专项类项目(2016GK1003)。
关键词
直流微网
并联运行
储能系统
均流控制
闭环控制系统
DC microgrid
parallel operation
energy storage
current-sharing method
closed loop control systems
