混合型模块化多电平换流器启动冲击电流特性分析及控制策略

doi:10.19595/j.cnki.1000-6753.tces.L80464

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Abstract Start-up control is the basic conditions of modular multilevel converter (MMC) system operation. However, the capacitor voltages of hybrid-MMC, which consists of full-bridge sub-modules and half-bridge sub-modules, are relatively low and unbalanced after precharge, resulting in inrush current and over modulation. The precharge voltage characteristics of hybrid-MMC and the equivalent circuit are analyzed, based on the converter topology. A method to calculate the precharge voltage of two kinds of sub-modules, respectively, is presented. Then, based on the capability of producing negative level of full-bridge sub-modules, an ac-side start-up control strategy is proposed in this paper, to suppress the inrush current and over modulation. The theory analysis and the proposed strategy are demonstrated by the PSCAD/EMTDC simulation.

Key words： Hybrid modular multilevel converter over modulation inrush current start-up control strategy

Received: 22 April 2019 Published: 05 March 2020

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TM721

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	Luo Yongjie
	Pu Yi
	Song Yonghui
	Yi Lizheng

Cite this article:

Luo Yongjie,Pu Yi,Song Yonghui等. The Inrush Current Characteristics and Control Strategies of Hybrid-Modular Multilevel Converter Systems During Start-Up Processes[J]. Transactions of China Electrotechnical Society, 2020, 35(zk1): 49-59.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80464 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/Izk1/49

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