针对电网不平衡与谐波的锁相环改进设计

doi:10.19595/j.cnki.1000-6753.tces.170291

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Abstract In grid-connected renewable energy generation systems, the accurate extraction of voltage synchronization signals, such as frequency, phase and amplitude, is the basis of effective control. To meet the detection requirement of such voltage synchronization signals under unbalanced and distorted grid conditions, a modified phase-locked loop (PLL) under stationary reference frame is proposed. This proposed PLL scheme extracts and eliminates the harmonic components existing in the distorted grid through resonators. The positive and negative components of the fundamental grid voltage are separated completely by combining the adaptive notch filter (ANF) and positive/ negative-sequence calculator (PNSC). Then, the voltage synchronization signals of positive voltage can be detected accurately. The simulation and experimental results indicate that the modified PLL can track the synchronization signals, and has the advantages of fast dynamic response, high detection accuracy and strong robustness against the frequency fluctuation. Thus, the modified PLL can offer effective control basis for the renewable energy generation systems.

Key words： Phase-locked loop (PLL) adaptive notch filter resonator unbalanced grid distorted grid

Received: 16 March 2017 Published: 28 March 2018

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TM712

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	Guo Lei
	Wang Dan
	Diao Liang
	Jiang Yue
	Feng Haijiang

Cite this article:

Guo Lei,Wang Dan,Diao Liang等. A Modified Design of Phase-Locked Loop for Unbalanced and Distorted Grid Voltage Conditions[J]. Transactions of China Electrotechnical Society, 2018, 33(6): 1390-1399.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170291 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I6/1390

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