AC- and DC-side disturbance characteristic analysis of MMC

被引：0
|
作者：
Qian W. [1 ]
Zhao Y. [1 ]
Xing F. [2 ]
Xu Z. [2 ]
Chen Y. [1 ]
Hu K. [1 ]
Zhou J. [1 ]
机构：
[1] Grid Planning and Research Center, Yunnan Power Grid Co., Ltd., Kunming
[2] College of Electrical Engineering, Zhejiang University, Hangzhou
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2020年 / 40卷 / 07期
关键词：
Disturbance characteristics; Electric converters; Frequency components balance principle; MMC;
D O I：
10.16081/j.epae.202007005
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
For avoiding the oscillation instability risk caused by MMC(Modular Multi-level Converter), the AC- and DC-side disturbance characteristics of MMC is deeply researched. Firstly, based on the dynamic characteristics of bridge-arm inductor and sub-module capacitor, the state-space model of MMC is established. Specially, the influence of the DC-side mid-point voltage is considered. Moreover, based on the frequency component balance principle, the frequency components of each variable in MMC under normal situa-tion, AC- and DC-side disturbance situations are analyzed. Meanwhile, the multi-frequency disturbance matrix is derived to describe the relationship among disturbance frequency components of each variable. On the basis, the accuracy of multi-frequency disturbance matrix is verified by time-domain simulation, and the AC- and DC-side port-impedances of MMC are calculated in sub- and super-synchronous frequency range. Finally, the disturbance amplification effect of MMC is further analyzed based on impedance-frequency characteristics. The results indicate that MMC will amplify the disturbance of certain frequencies in sub- and super-synchronous frequency range, and the specific frequency is related to the system parameters. © 2020, Electric Power Automation Equipment Press. All right reserved.
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页码：114 / 120
页数：6
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