三相并网系统的一种快速相位检测方法

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Abstract

Detecting the phase angle information quickly and accurately is very important in three phase grid connected system and the immunity of the detecting method should be good.This paper proposes a phase locked loop (PLL) method which is different from the traditional synchronous rotating frame PLL (SRF-PLL).This proposed method calculates the phase angle directly by analyzing the corresponding relationship between the ratios of three phase voltages to the sum of three phase voltages′ absolute value and the phase angle.When the three phase voltage is unbalanced or includes harmonics,the positive-sequence component (PSC) of the grid voltage is extracted by the method of double second order generalized integrator (DSOGI),then the phase angle can be detected by the proposed method in this paper with the PSC.Moreover,the proposed method does not need the Park transformation,so it is easy to implement.As a consequence,by comparison with SRF-PLL,the effectiveness and advantage of the proposed method are verified through experiment.

Key words： Phase locked loop double second order generalized integrator (DSOGI) unbalanced grid voltage positive-sequence component

Received: 20 August 2016 Published: 23 March 2017

PACS:

TM464

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	Articles by authors
	Zhao Hongyan
	Li Yan
	Du Jifei
	Zheng Qionglin
	Liang Mei

Cite this article:

Zhao Hongyan,Li Yan,Du Jifei等. A Fast Phase Detection Method Applied in Three-Phase Grid Connected System[J]. Transactions of China Electrotechnical Society, 2016, 31(增刊2): 67-75.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I增刊2/67

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