基于模块化多电平换流器的多端口交直流变换器仿真研究

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Abstract Modular multilevel converter (MMC) is a highly modular and highly centralized power electronic converter topology with an AC port and multiple DC sub-module ports. Through appropriate modification, it can be applied to large-scale cluster of DC source and loads (such as electric vehicles, AC and DC microgrids, decommissioned energy storage batteries, etc.) into the network. Direct connection between electric vehicle, AC and DC microgrids, or other DC source/load and MMC will affect the safe operation of MMC, increase control difficulty. For this reason, the Isolated Bidirectional DC/DC (IBDC) is introduced as the isolation link between the sub-module of MMC and the DC source/load to form a MMC-based multi-port AC/DC converter (MMC-IBDC). Basing on analyzing working mechanism, a three-layer control strategy is proposed and corresponding controllers are designed aiming at large-scale cluster of DC source and loads. Considering differences among application scenarios, two cases are simulated in which the results under PSCAD/EMTDC verify the rationality of MMC-IBDC topology and effectiveness of the control strategy.

Key words： modular multilevel converters (MMC) electric vehicle isolated bidirectional full-bridge DC-DC converter multi-port AC/DC converter multilayer control

Received: 28 March 2020

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	Articles by authors
	Huang Yanwan
	Yang Yongchun
	Liang Haifeng

Cite this article:

Huang Yanwan,Yang Yongchun,Liang Haifeng. Simulation research of MMC based multi-terminal AC/DC converter[J]. Electrical Engineering, 2020, 21(11): 13-18.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I11/13

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