Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 10: 1510 - 1522

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.512

New Type Power System and the Integrated Energy

Assessment and Extension Method for Stable Operation Domain of DFIG in Asymmetric Weak Grid

  • FEI Renxiang ,
  • XU Hailiang ,
  • GE Pingjuan ,
  • CHEN Xiangyu
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  • College of New Energy, China University of Petroleum (East China), Qingdao 266580, Shandong, China

Received date: 2023-10-10

  Revised date: 2024-01-24

  Accepted date: 2024-02-06

  Online published: 2024-04-30

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Abstract

In asymmetric weak grid, there exists a complex coupling path between the positive- and negative-sequences of the impedance between a doubly-fed wind turbine (DFIG) and the grid, leading to intricate interactions. Since grid codes require wind turbines to provide positive- and negative-sequence dynamic reactive power support, improper settings of these currents may result in system instability and oscillations. Therefore, this paper first develops a sequence impedance model of the DFIG-grid system using a harmonic linearization method, revealing the effects of positive-sequence active current, positive-sequence reactive current, and negative-sequence reactive current on system stability, and analyzes the stability mechanism induced by inter-sequence coupling. Furthermore, considering stability constraints, grid codes, and converter capacity, it characterizes the stable operating domain of the DFIG. To solve the problem of insufficient stable operating range in weak grid, it proposes an adaptive oscillation suppression phase-locked loop (PLL) method, which adaptively suppresses the oscillatory component in the PLL input, thereby extending the stable operating domain of the DFIG. Finally, simulation results verify the correctness of the theoretical analysis and the effectiveness of the proposed control method.

Key words： weak grid; doubly-fed induction generator (DFIG); stability analysis; inter-sequence coupling

Cite this article

FEI Renxiang , XU Hailiang , GE Pingjuan , CHEN Xiangyu . Assessment and Extension Method for Stable Operation Domain of DFIG in Asymmetric Weak Grid[J]. Journal of Shanghai Jiaotong University, 2025 , 59(10) : 1510 -1522 . DOI: 10.16183/j.cnki.jsjtu.2023.512

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