基于阻抗分析的三相逆变器负载不平衡控制

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Abstract The paper researches on the mechanism of the unbalanced output voltage for the three-phase inverter. Based on the analysis of output characteristic of inverter, the method of restraining the unbalanced output voltage according to decrease the output impedance is introduced. Then, on the basis of DSC(Delayed Signal Cancellation), two synchronous reference frames: a positive-sequence voltage and current regulated by PI controllers in a positive synchronous reference frame, and a negative-sequence voltage and current regulated by PI controllers in a negative synchronous reference frame are used to control the three-phase inverter with unbalanced loads. The comparison of output impedance shows that the proposed control strategy can not only decrease output impedance of all frequency, but also can especially greatly decrease the output impedance of inverter at the frequency of 100Hz in positive-synchronous reference frame. The results of simulation and experiment prove the correctness and availability of control strategy proposed in this paper.

Key words： Inverter delayed signal cancellation output impedance unbalanced load symmetrical component

Received: 08 October 2011 Published: 20 March 2014

PACS:

TM464

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	Articles by authors
	Duan Xiaoli
	Luo Yaohua
	You Jiang
	Meng Fanrong

Cite this article:

Duan Xiaoli,Luo Yaohua,You Jiang等. Control Strategy Based on Impedance Analysis for Three-Phase Inverter with Unbalanced Load[J]. Transactions of China Electrotechnical Society, 2012, 27(12): 56-62.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I12/56

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