基于复变陷波器的并网锁相环直流偏移消除方法

doi:10.19595/j.cnki.1000-6753.tces.171437

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Abstract In the three-phase grid-connected applications under ideal grid conditions, the synchronous reference frame phase-locked loop (SRF-PLL) is the most common synchronization technique. However, the presence of a DC offset can cause fundamental oscillation errors in the phase estimation. The common method to solve this problem is to use notch filter (NF) or delayed signal cancellation (DSC) in SRF-PLL, but these methods will reduce the dynamic response speed of the system. In this paper, based on the complex domain analysis of the multi-complex-coefficient filter (MCCF), a fast DC offset rejection method using a complex notch filter (DCCNF) for three-phase PLL is proposed, and the parameter design guidelines of the proposed PLL are given. The proposed new DCCNF-based PLL has a fast response speed and good DC offset elimination performance. The simulation and experimental results verify the effectiveness of the proposed method.

Key words： DC-offset synchronous reference flame phase-locked loop complex notch filter (CNF)

Received: 20 October 2017 Published: 29 December 2018

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TM46

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	Articles by authors
	Hui Nanmu
	Wang Dazhi
	Li Yunlu

Cite this article:

Hui Nanmu,Wang Dazhi,Li Yunlu. DC-Offset Elimination Method for Grid-Connected Phase-Locked Loop Based on Complex Notch Filter[J]. Transactions of China Electrotechnical Society, 2018, 33(24): 5897-5906.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171437 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I24/5897

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