基于三相电压空间矢量的开环锁相方法

doi:10.19595/j.cnki.1000-6753.tces.190922

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Abstract

Accurate and fast phase acquisition for fundamental positive-sequence components is the premise for precise control of grid-connected converters. However, when the power grid is abnormal, the traditional closed-loop phase-locked method has a slow dynamic response, which is difficult to meet the control requirements of fast response. For this reason, an open-loop phase-locked method based on three-phase voltage space vector is proposed. In the method, the frequency of power grid is obtained by zero-crossing detection, the harmonic and noise in the grid voltage are filtered by discrete Fourier series, and the voltage signal orthogonal to the fundamental voltage is obtained. On this basis, the symmetric component method is used to extract the positive sequence component of voltage. Finally, the phase of fundamental positive-sequence voltage is calculated based on voltage space vector. At the same time, an improved zero-crossing detection algorithm is proposed to deal with the abnormal frequency when the voltage of power grid changes abruptly, which can effectively detect the frequency of abnormal grid voltage. The proposed phase-locked method does not require parameter design, and has a simple structure and fast response speed. It has strong robustness in abnormal grid environment. The simulation and experimental results verify the effectiveness and feasibility of the proposed method.

Key words： Open-loop phase-locked space vector discrete Fourier series symmetric component method zero-crossing detection

Received: 25 July 2019

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TM46

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	Articles by authors
	Yu Pan
	Sheng Wanxing
	Zhong Peijun
	Sun Jianjun
	Pan Jing

Cite this article:

Yu Pan,Sheng Wanxing,Zhong Peijun等. An Open-Loop Phase-Locked Method Based on Three-Phase Voltage Space Vector[J]. Transactions of China Electrotechnical Society, 2020, 35(16): 3460-3469.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190922 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I16/3460

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