基于定有功电流限值控制的MMC型UPQC协调控制方法

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Abstract This paper applies the topology of modular multilevel converter(MMC) to the unified power quality conditioner(UPQC). In order to improve the comprehensive compensation functions of MMC-UPQC at the high voltage, large capacity power quality environment, the paper analyzes the voltage sag compensation capability of UPQC’s series MMC theoretically in detail. The topology mechanism of MMC-UPQC is given; the time domain expressions are calculated with the voltage sag value, the compensation duration, the main circuit and MMC parameters and so on, a coordinated control design method for UPQC is proposed, which is the fixed active current limit value control allowing the reduction of the common DC link voltage based on the traditional fixed DC voltage control. Define and calculate two voltage thresholds dividing the MMC-UPQC operation into the aforementioned states. The MMC-UPQC system simulation results under PSCAD/EMTDC indicate that the theoretical analysis is effective and correct. The simulation results also illustrates that the proposed coordinated control could improve voltage sag compensation time and amplitude supplied by UPQC.

Key words： Unified power quality conditioner modular multilevel converter fixed active current limit value voltage sag coordinated control

Received: 25 January 2014 Published: 13 April 2015

PACS:	TM315
	TM712

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	Lu Jingjing
	Xiao Xiangning
	Zhang Jian
	Xu Yunfei

Cite this article:

Lu Jingjing,Xiao Xiangning,Zhang Jian等. MMC-UPQC Coordinated Control Method Based on Fixed Active Current Limit Value Control[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 196-204.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I3/196

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