Reliability evaluation of modular multilevel converter based on Markov model

Journal of Modern Power Systems and Clean Energy

Tongzhen Wei¹  Dan Zhang²  Ting Hua³  Ting Yang³  Gang Chen⁴  Liang Zhang⁵  Jihong Zhu⁵ 

[1] Institute of Electrical Engineering, Chinese Academy of Sciences,Beijing,China,100190;School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University,Shanghai,China,200240;School of Power Electric Engineering, Nanjing Institute of Technology,Nanjing,China,211167;State Grid Jiangsu Electric Power Company, Xuzhou Power Supply Company,Xuzhou,China,221005;State Key Laboratory of Intelligent Technology and Systems, Tsinghua University,Beijing,China,100084;

关键词: Modular multilevel converters;    Reliability evaluation;    Markov model;   

DOI  :  10.1007/s40565-019-0515-8

来源: DOAJ

【 摘 要 】

The modular multilevel converter (MMC) is now the most attractive topology for medium and high voltage power conversion applications with several advantages over the traditional voltage source converter (VSC). However, due to a large number of sub-modules (SMs) in the MMC, system reliability is a big challenge in its practical application, where each SM may be considered as a potential point of failure. In this paper, a reliability evaluation based on the Markov model is proposed for the MMC. The failure rates of the power electronic devices and SMs are firstly analyzed. Then, the Markov model and the state transition equation of the system are built in detail. A general reliability evaluation function is established, in which the mean time to failure and reliability evaluation of the MMC with redundant SMs are also discussed. Finally, a practical direct current (DC) distribution example for reliability evaluation is analyzed, and the results verify that the reliability evaluation based on the Markov model could provide a useful reference for project design.

【 授权许可】

Unknown