Control strategy based on dynamic virtual impedance to suppress circulating current between multiple parallel inverters

被引：0
|
作者：
Wang J. [1 ]
Mu L. [1 ]
Liu X. [1 ]
机构：
[1] Department of Electrical Engineering, Tongji University, Shanghai
来源：
| 1600年 / Electric Power Automation Equipment Press卷 / 41期
基金：
中央高校基本科研业务费专项资金资助;
关键词：
Circulating current analysis; Droop control; Dynamic virtual impedance; Parallel inverters; Reactive power distribution;
D O I：
10.16081/j.epae.202101034
中图分类号：
学科分类号：
摘要：
Inverters of distributed power generation are operated in parallel in islanding microgrid, which causes the circulating current by the difference of their parameters. Therefore, a circulating current suppression strategy based on dynamic virtual impedance is proposed. Firstly, the composition of the circulating current based on droop control is analyzed, and it is concluded that the reactive circulating current is dominant, and the mismatch of line impedance causes the reactive circulating current. Secondly, the reactive power feedback term is introduced into the virtual impedance to realize the accurate distribution of reactive power, so as to suppress the reactive circulating current. Meanwhile, the traditional droop control strategy is improved, and the voltage compensation term is added into the voltage control equation to eliminate the line voltage drop and further suppress the reactive circulating current. Finally, a microgrid model with three inverters in parallel is built in MATLAB/Simulink. Simulative results show that the dynamic virtual impedance control strategy can eliminate the influence of line impedance, realize the accurate distribution of reactive power among inverters, and solve the problem of the circulating current among multiple parallel inverters. © 2021, Electric Power Automation Equipment Press. All right reserved.
引用
收藏
页码：94 / 100
页数：6
相关论文
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