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| A Three-Phase Phase-Locked Loop Technique Based on All Complex Coefficient Filter |
| He Yu1,2, Qi Hanhong2, Deng Xiaolong1 |
1. School of Intelligent Engineering Jiangsu Vocational College of Information Technology Wuxi 214153 China;
2. School of Electrical Engineering Yanshan University Qinhuangdao 066004 China |
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Abstract Recently, the complex-coefficient-filter (CCF)-based phase-locked loop (PLL) technique has become a hotspot in grid synchronization research. However, the mathematical model and control performance of the current CCF-PLL have been confirmed to be basically consistent with the traditional real coefficient filter PLL. In order to improve the control performance, a novel three-phase PLL based on all complex coefficient filter is put forward. Firstly, the voltage transfer function of the pre-stage filter structure is given, and it is demonstrated that the structure can accurately separate the fundamental positive- and negative-sequence components. Then, the mathematical model of the pre-stage structure on the fundamental positive-sequence phase is derived. Combined with the post-stage synchronous rotating frame PLL, the mathematical model of the entire PLL system is built, and then the system is designed by the third-order optimum correction method. Wherein, the related control parameters are determined. It is shown that with the same open-loop cut-off frequency, the proposed PLL has a wider mid-frequency band width and a larger phase margin than the CCF-PLL. In addition, a multiple all-complex-coefficient-filter based PLL is designed to thoroughly eliminate harmonics. Finally, simulation and experimental results show that the control performance of the proposed PLL is better than that of the CCF-PLL.
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Received: 22 June 2020
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2021, Vol. 36 
