基于改进型模块化嵌入式多电平换流器拓扑的HVDC直流故障清除策略

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Abstract At present, most of the existing high-voltage flexible DC transmission projects use modular multilevel converters (MMC) including half-bridge submodules, but half-bridge MMC lacks the ability to clear DC faults. In order to solve this problem, this paper proposes an improved MEMC topology based on the original MEMC (module embedded multilevel converter) topology, which has higher reliability and power handling capability, and proposes a control technology that uses The negative voltage generated by the sub-module performs forced commutation of the thyristor on the load with lagging power factor. In addition to the DC fault clearing capability, the improved MEMC also provides a wider operating range and a smaller sub-module capacitor size. Finally, an improved MEMC-HVDC model is built in PSCAD/EMTDC, and a DC fault simulation is carried out. The simulation results verify the applicability of the topology and the DC fault removal capability.

Key words： modular multilevel converter (MMC) improved module embedded multilevel converter (MEMC) thyristor commutation DC fault clearing

Received: 12 May 2020

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	Wang Ting
	Yang Mingfa

Cite this article:

Wang Ting,Yang Mingfa. HVDC DC fault clearing strategy based on improved MEMC topology[J]. Electrical Engineering, 2020, 21(12): 17-22.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I12/17

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