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Research on Prefiltering Phase-locked Loop Based on SOGI and CDCCF
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Jing SHI1, Jun YANG2, Long WEN1, Junqing SHEN1, Guanglei CHE1, Songxuan LI3
Journal of Power Supply | 2025, 23(6) : 237 - 246
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Journal of Power Supply | 2025, 23(6): 237-246
• Renewable Energy System •
Research on Prefiltering Phase-locked Loop Based on SOGI and CDCCF
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Jing SHI1, Jun YANG2, Long WEN1, Junqing SHEN1, Guanglei CHE1, Songxuan LI3
Affiliations
  • 1.Electrical Research Science and Technology Co., Ltd, Xining 810000, China
  • 2.Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810000, China
  • 3.College of Electrical Engineering, Chongqing University, Chongqing 400044, China
Published: 2025-10-30 doi: 10.13234/j.issn.2095-2805.2025.6.237
Outline
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Phase-locked loop (PLL) is one of the important structures to control photovoltaic inverters to realize grid-connected synchronization. Aimed at the problem that αβ-PLL will have large errors in the detection frequency and phase when unbalanced faults and harmonic interference occur in power grid, a novel prefiltering PLL (PFPLL) based on cross decoupling complex coefficient filter (CDCCF) and second-order generalized integrator (SOGI) is proposed in this paper. The SOGI with the capability of eliminating specific-order harmonics is used as the prefiltering link of PFPLL, and the CDCCF with a feedback loop is used as the signal decoupling link of PFPLL. The proposed PFPLL structure can eliminate voltage imbalance and harmonic components, thus realizing the frequency self-adaptation. A simulation model and an experimental platform were built, and results verified the filtering capability of PFPLL.

Grid voltage imbalance  /  harmonic distortion  /  second-order generalized integrator (SOGI)  /  complex coefficient filter
石径, 杨军, 文龙, 沈俊庆, 车广磊, 李淞轩. 基于SOGI和CDCCF的复合前置滤波锁相环研究. 电源学报, 2025 , 23 (6) : 237 -246 . DOI: 10.13234/j.issn.2095-2805.2025.6.237
Jing SHI, Jun YANG, Long WEN, Junqing SHEN, Guanglei CHE, Songxuan LI. Research on Prefiltering Phase-locked Loop Based on SOGI and CDCCF[J]. Journal of Power Supply, 2025 , 23 (6) : 237 -246 . DOI: 10.13234/j.issn.2095-2805.2025.6.237
Funding
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  • Science and Technology Fund Project of State Grid Qinghai Electric Power Company(SGTYHT/20-JS-224)
Appendix
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Year 2025 volume 23 Issue 6
53
5
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.6.237
  • Receive Date：2023-02-08
  • Online Date：2026-10-26
  • Published：2025-10-30
Article Data
Affiliations
History
  • Received：2023-02-08
  • Revised：2023-06-23
  • Accepted：2023-07-29
Funding
Science and Technology Fund Project of State Grid Qinghai Electric Power Company(SGTYHT/20-JS-224)
Affiliations
    1.Electrical Research Science and Technology Co., Ltd, Xining 810000, China
    2.Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810000, China
    3.College of Electrical Engineering, Chongqing University, Chongqing 400044, China
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