Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (11): 1526-1531.DOI: 10.12068/j.issn.1005-3026.2018.11.002

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DC-Offset Elimination Method for Grid-Connected Phase-Locked Loop by Modified DSC

HUI Nan-mu1, WANG Da-zhi1, LI Yun-lu2   

  1. 1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China; 2. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China.
  • Received:2017-07-31 Revised:2017-07-31 Online:2018-11-15 Published:2018-11-09
  • Contact: HUI Nan-mu
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Abstract: The use of delay signal cancellation(DSC)operator in the control inner loop of SRF-PLL slows down the dynamic behavior. A fast DC-offset rejection method for three-phase PLL of grid synchronization is proposed, which improves the dynamic performance of traditional DSC-based PLL by using the modified DSC operator. This method can effectively overcome the influence of the system bandwidth on the DC-offset elimination and improve the response speed of the system. In addition, the adjustment time of the phase jump and frequency step change based on the MDSC-based PLL is also very small. The effectiveness of the proposed method is confirmed through simulation and experiment results.

Key words: DC-offset, synchronous reference flame, phase-locked loop, signal delay cancellation, phase estimation

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