阶梯波调制法链式STATCOM直流电容电压平衡控制

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Abstract A DC capacitor voltage balance control strategy is proposed, in order to improve waveform quality of the output voltage and output current of cascade STATCOM based on step wave modulation method. This paper analyzed the relation of conduction mode, operating mode and capacitor voltage variation, summarized the four kind of operating regions(A, B, C, D) and numerical relationship between conduction angle and voltage variation in every region. The conduction mode in every region according to capacitor voltage sequencing result in every sampling point is selected, which makes the higher chain voltage, the smaller the voltage rise degree of A and D regions, and makes the higher chain voltage, the bigger the voltage decline degree of B and C regions, so that regulates capacitor voltage toward mean value. The parameters of link conduction angle and modulation ratio do not change in adjustment process. The value and variation of capacitor voltage on two adjacent sampling point are used to judge the operating mode (capacitive, inductive) in order to avoid operating mode judgment inaccuracy that be caused by PLL error. The experimental results verify the feasibility and effectiveness of the proposed control strategy on experimental platform of three-phase eleven-level cascade STATCOM.

Key words： Cascade STATCOM step wave modulation cascaded multilevel DC capacitor voltage balance mode judgment

Received: 18 September 2012 Published: 25 March 2014

PACS:	TM46
	TM714.3

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	Articles by authors
	Yang Bo
	Zeng Guang
	Zhong Yanru
	Zhou Bo

Cite this article:

Yang Bo,Zeng Guang,Zhong Yanru等. DC Capacitor Voltage Balance Control Strategy of Cascade STATCOM Based on Step Wave Modulation[J]. Transactions of China Electrotechnical Society, 2013, 28(10): 280-287.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I10/280

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