AC-and DC-side impedance models of modular multilevel converter

被引：0
|
作者：
Lü J. [1 ]
Cai X. [1 ]
Zhang J. [1 ]
机构：
[1] Wind Power Research Center, Shanghai Jiao Tong University, Shanghai
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2017年 / 37卷 / 01期
关键词：
Circulating current control; Impedance; Modeling; Modular multilevel converter; Resonance;
D O I：
10.16081/j.issn.1006-6047.2017.01.021
中图分类号：
学科分类号：
摘要：
The impedance modeling of MMC(Modular Multilevel Converter) is the basis for analyzing the resonance and stability at AC and DC sides of MMC-based power-electronics system. While the impact of circulating current control on the AC-and DC-side impedances of MMC is considered, the DC-side and AC- side small-signal impedance analytical models of MMC are respectively derived according to its topological structure, operational features and control characteristics. A time-domain simulation model of three-phase MMC is built with MATLAB/Simulink and the AC-and DC-side small-signal impedances of MMC are calculated based on the derived analytical models, which are compared with the impedances measured by the method of small-disturbance voltage/current injection for verifying the accuracy of the analytical models. The simulative results show that, without circulating current control, the AC-side small-signal impedance has a resonance peak in low-frequency range; the resonance peak could be effectively restrained by the circulating current control. © 2017, Electric Power Automation Equipment Press. All right reserved.
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页码：131 / 136and143
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