一种正负序分离锁相环及其在并网型风力发电系统中的应用

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Abstract This paper proposes a novel phase lock loop(PLL) scheme based on positive and negative-sequence cascaded delayed signal cancellation method. The positive and negative sequence components of the fundamental voltage or current in three phase system can be calculated with fast transient response, and any specified harmonic can be eliminated by choosing appropriate parameters. No low-pass filters are needed, and perfect dynamical performance can be achieved. The PLL is used in low voltage ride through control in grid-connected wind power system to provide fast and accurate grid information. Simulation and experimental results show that the frequency, phase angle and positive and negative sequence components can be obtained with fast dynamic response and high precision. The method provides a reliable basis for the control of grid connected PWM converters under asymmetrically distorted three-phase voltages in wind power systems.

Key words： Phase lock loop(PLL) positive and negative-sequence detection delayed signal cancellation(DSC) wind power system low voltage ride through(LVRT)

Received: 07 February 2012 Published: 25 March 2014

PACS:

TM461

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	Chen Mingliang
	Xiao Fei
	Liu Yong
	Wang Haoxiong
	Li Quanfeng

Cite this article:

Chen Mingliang,Xiao Fei,Liu Yong等. A Positive and Negative-Sequence Detection PLL and Its Application in Wind Power Generation System[J]. Transactions of China Electrotechnical Society, 2013, 28(8): 181-186.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I8/181

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