Interaction Analysis of Current Control Loops in MMC Under Asymmetrical Grid Faults

被引：0
|
作者：
Che, Jianglong [1 ]
Huang, Meng [1 ]
Zha, Xiaoming [1 ]
Sheng, Ju [1 ]
Fu, Xikun [1 ]
机构：
[1] Wuhan Univ, Sch Elect Engn & Automat, Wuhan, Peoples R China
来源：
2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2021年
基金：
中国国家自然科学基金;
关键词：
grid-connected MMC; asymmetrical voltage sags; current control loops; interaction; system stability; MODULAR MULTILEVEL CONVERTER;
D O I：
10.1109/ECCE47101.2021.9595492
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
When an asymmetrical grid voltage drop occurs in a grid-connected modular multilevel converter (MMC) system, the influence that expanded double frequency circulating current exerts on the circulating current suppressing controller (CCSC) will be coupling to the positive current controller and lead to system instability. In this paper, the CCSC and inner current controller are modeled and the interactions between them during the transient process are studied. It shows that positive current is prone to be unstable due to improper high proportional gains of both current control loops. Finally, the circuit simulations in PSCAD/EMTDC verify the analysis results.
引用
收藏
页码：3378 / 3382
页数：5
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