Transactions of China Electrotechnical Society  2020, Vol. 35 Issue (16): 3460-3469    DOI: 10.19595/j.cnki.1000-6753.tces.190922
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An Open-Loop Phase-Locked Method Based on Three-Phase Voltage Space Vector
Yu Pan1, Sheng Wanxing2, Zhong Peijun1, Sun Jianjun1, Pan Jing3
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China;
2. China Electric Power Research Institute Beijing 100192 China
3. State Grid Anhui Electric Power Co. Ltd Hefei 230061 China

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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 wordsOpen-loop phase-locked      space vector      discrete Fourier series      symmetric component method      zero-crossing detection     
Received: 25 July 2019     
PACS: TM46  
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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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