Over-Voltage Protection Strategy for Sub-Module of Modular Multilevel Converter with Reduced Sensors
Luo Derong1, He Ruizhi1, Huang Shoudao1, Zhang Zhigang2, Hou Weiyang1
1. College of Electrical and Information Engineering Hunan UniversityChangsha 410082 China; 2. College of Electronic Information and Electrical Engineering Changsha University Changsha 410003 China
Abstract For the over-voltage problem in sub-module of modular multilevel converter (MMC) with reduced sensors, this paper proposes a sub-module over-voltage protection strategy. First of all, it is pointed out that the sub-module voltage not being directly measured in real-time is the cause of over-voltage. Then, the necessity of pre-detection of sub-module voltage before load access operation is studied. The sub-module over-voltage detection and prevention strategy during load access operation are proposed. Finally, case studies are performed on a 31-level single-phase MMC in Matlab/Simulink. Meanwhile, a 9-level single-phase MMC laboratory prototype is built to verify the effectiveness of this strategy. The simulation and experimental results show that the over-voltage protection strategy proposed in this paper can achieve good overvoltage protection effect when the capacitance parameters are consistent and deviated, and has strong parameter adaptability.
Luo Derong,He Ruizhi,Huang Shoudao等. Over-Voltage Protection Strategy for Sub-Module of Modular Multilevel Converter with Reduced Sensors[J]. Transactions of China Electrotechnical Society, 2019, 34(14): 2957-2969.
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2019, Vol. 34 
