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Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale

Author

Listed:
  • Dong Wang

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

  • Houquan Chen

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

  • Yunhui Huang

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

  • Xiangtian Deng

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

  • Guorong Zhu

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

Abstract

The DC-link voltage control (DVC) timescale (i.e., the frequency dynamics covering converter outer controls) instabilities in wind generation have gained increased attention recently. This paper presents DVC timescale modeling and stability analysis for multi doubly-fed induction generators (DFIGs) connected to weak AC grids. A reduced-order, small-signal model of a grid-tied multi-DFIG system, designed for DVC dynamics analysis, is firstly proposed. The model allows for the dynamic interactions among the DC-link voltage control, active power control (APC), terminal voltage control (TVC) and phase-locked loop (PLL). Eigenvalue and participation factor analyses are conducted to explore the potential instabilities and correlated critical factors for such a multi-machine system. The sensitivity studies find that instability can occur at high levels of power generations or low short-circuit ratio (SCR) conditions. In addition, the dominant mode is identified to be highly related to the PLL, and its modal damping is decreased when the bandwidths of PLLs in different generators are close. Detailed model-based time domain simulations verified the analysis above.

Suggested Citation

  • Dong Wang & Houquan Chen & Yunhui Huang & Xiangtian Deng & Guorong Zhu, 2020. "Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale," Energies, MDPI, vol. 13(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3689-:d:386139
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    Citations

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    Cited by:

    1. Zhilin Guo & Liangliang Hao & Junyong Wu & Xingguo Wang & Hong Cao & Guang Wang, 2020. "Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC," Energies, MDPI, vol. 13(18), pages 1-16, September.
    2. Lebogang Masike & Michael Njoroge Gitau, 2023. "A Modular Circuit Synthesis Oriented Modelling Approach for Non-Isolated DC-DC Converters in CCM," Energies, MDPI, vol. 16(3), pages 1-30, January.

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