向无源网络供电的MMC型直流输电系统建模与控制

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Abstract Modular multilevel converter(MMC) is a multilevel converter suitable for VSC-HVDC transmission. In this paper, the circuit configuration and operation mechanism of MMC based VSC-HVDC transmission system connected to passive networks are introduced. A generalized mathematical model for the MMC based VSC-HVDC system is deduced, and a double closed-loop controller containing an inner fast current loop and an outer voltage loop is proposed for the control of the inverter station. The angular frequency of the synchronous phase angle provided for the dq transformation of the inverter controllers is set at the rated value, and thus a nominal system frequency is ensured at the inverter AC side. The steady-state and dynamic performance of the proposed controllers under different operation conditions are shown by time-domain simulation carried out in PSCAD/EMTDC. Therefore, high-quality power supply of passive networks can be achieved by the proposed MMC-HVDC transmission system.

Key words： Modular multilevel converter(MMC) voltage source converter based high voltage direct current(VSC-HVDC) transmission passive network vector control double closed loop

Received: 18 February 2011 Published: 28 November 2013

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TM721

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	Guan Minyuan
	Xu Zheng

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Guan Minyuan,Xu Zheng. Modeling and Control of Modular Multilevel Converter Based VSC-HVDC System Connected to Passive Networks[J]. Transactions of China Electrotechnical Society, 2013, 28(2): 255-263.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I2/255

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