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Grid-Synchronization Stability Analysis for Multi DFIGs Connected in Parallel to Weak AC Grids

Author

Listed:
  • Dong Wang

    (School of Automation, Department of Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Yunhui Huang

    (School of Automation, Department of Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Min Liao

    (Global Energy Interconnection Research Institute Co. Ltd, State Grid, Beijing 102209, China)

  • Guorong Zhu

    (School of Automation, Department of Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

  • Xiangtian Deng

    (School of Automation, Department of Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

Abstract

Recent works have shown that phase-locked loop (PLL) synchronized wind turbines (WTs) suffer stability issues when integrated into weak grids. However, most of the current studies are limited to a single machine case, the interactions among the WTs are usually overlooked. This paper studies the stability of multiple doubly-fed induction generators (DFIGs) that are connected in parallel to a weak AC grid. A state space model of a two-DFIG system is firstly presented. Subsequently, eigenvalue sensitivity analysis shows that instability can occur at low short-circuit ratio (SCR) or heavy loading conditions. Meanwhile, participation factor analysis implies that the unstable mode is primarily induced by the interactions between the PLLs of the two WTs. Further, to make out how the PLLs interact to cause instability, a reduced-order model is proposed for analysis simplicity, and an explanation in terms of transfer function residue is given for illustration. Detailed model-based time domain simulations are conducted to validate the analyses’ results.

Suggested Citation

  • Dong Wang & Yunhui Huang & Min Liao & Guorong Zhu & Xiangtian Deng, 2019. "Grid-Synchronization Stability Analysis for Multi DFIGs Connected in Parallel to Weak AC Grids," Energies, MDPI, vol. 12(22), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4361-:d:287362
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    Citations

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    Cited by:

    1. Panos C. Papageorgiou & Konstantinos F. Krommydas & Antonio T. Alexandridis, 2020. "Validation of Novel PLL-driven PI Control Schemes on Supporting VSIs in Weak AC-Connections," Energies, MDPI, vol. 13(6), pages 1-21, March.
    2. Dong Wang & Xiaojie Zhang & Lei Yang & Yunhui Huang & Wei Huang & Chen Wu & Shengnan Li, 2020. "Analysis of Synchronization Stability for Multi VSCs Parallel-Connected to Weak Grids by Improved Net Damping Criterion," Energies, MDPI, vol. 13(13), pages 1-16, June.
    3. Seyed Morteza Alizadeh & Sakineh Sadeghipour & Cagil Ozansoy & Akhtar Kalam, 2020. "Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks," Energies, MDPI, vol. 13(13), pages 1-34, July.

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