Energy rebalance control and safe operation region analysis of MMC with sub-module fault

被引：0
作者：
Yang L. [1 ,2 ]
Li Y. [1 ,2 ]
Li Z. [1 ,2 ]
Wang P. [1 ]
机构：
[1] Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing
[2] School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2018年 / 38卷 / 04期
关键词：
Energy rebalance; Modular multilevel converter; Safe operation region; Sub-module fault;
D O I：
10.16081/j.issn.1006-6047.2018.04.008
中图分类号：
TM72 [输配电技术];
学科分类号：
摘要：
MMC(Modular Multilevel Converter) has been widely applied in the flexible-HVDC power transmission and the sub-module fault is its common fault type due to the huge quantitity of sub-modules in the high-voltage and large power MMC. A certain amount of redundant sub-modules are set in each bridge-arm of MMC to improve its reliability. However,when asymmetric sub-module fault occurs in MMC,the fundamental fluctuations will appear in the DC current,influencing the operation performance of MMC. The conditions for energy balance among bridge-arms of MMC are analyzed under the working condition of failure submodules both in upper and lower bridge-arms,on this basis,an energy rebalance control strategy is proposed to suppress the fluctuations in DC current,which,compared with the traditional control strategy,needs not to increase the capacitor voltage of sub-module in the rated redundant operation region. The maximum safe operation region of MMC by using the proposed control strategy is also analyzed,and it is proved to be extended and the reliability of MMC is further improved. Hardware in loop experiment results of ±350 kV/1 000 MW MMC verify the effectiveness of the proposed control strategy and the validity of safe operation region analysis. © 2018, Electric Power Automation Equipment Press. All right reserved.
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页码：52 / 59
页数：7
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