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Stability Impacts of an Alternate Voltage Controller (AVC) on Wind Turbines with Different Grid Strengths

Author

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  • Dimitrios Dimitropoulos

    (AAU Energy, Aalborg University, 9220 Aalborg, Denmark)

  • Xiongfei Wang

    (AAU Energy, Aalborg University, 9220 Aalborg, Denmark)

  • Frede Blaabjerg

    (AAU Energy, Aalborg University, 9220 Aalborg, Denmark)

Abstract

This paper studies the stability impact of the alternate voltage controller’s (AVC) low-pass filter (LPF) in a wind turbine’s grid-connected voltage source converter (VSC). A small-signal model of the grid-connected converter is designed with a grid-following synchronization control. More specifically, the non-linear state-space model of the grid-connected converter was developed, including the dynamics of both the inner and outer control loops of the converter, the dynamics of the elements of the electrical system, as well as the digital time delay. An eigenvalue-based stability analysis gives insight into the stability impacts of the outer-loop controllers. It is proven that the cutoff frequency of the AVC’s LPF affects the phase-locked loop (PLL) and AVC bandwidths of instability, as well as the corresponding critical oscillation frequencies. This phenomenon is observed in both weak and strong grids. Consequently, the small-signal stability regions of the PLL and AVC bandwidth can be identified for the range of the AVC’s LPF cutoff frequency under study. The stability regions of the PLL and AVC, which are obtained from the small-signal model, as well as the determined critical oscillation frequencies, are validated through time domain simulations and fast-Fourier transformation (FFT) analysis.

Suggested Citation

  • Dimitrios Dimitropoulos & Xiongfei Wang & Frede Blaabjerg, 2023. "Stability Impacts of an Alternate Voltage Controller (AVC) on Wind Turbines with Different Grid Strengths," Energies, MDPI, vol. 16(3), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1440-:d:1053909
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    References listed on IDEAS

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    1. Antoine Musengimana & Haoyu Li & Xuemei Zheng & Yanxue Yu, 2021. "Small-Signal Model and Stability Control for Grid-Connected PV Inverter to a Weak Grid," Energies, MDPI, vol. 14(13), pages 1-24, June.
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    Cited by:

    1. Dimitrios Dimitropoulos & Mohammad Kazem Bakhshizadeh & Lukasz Kocewiak & Xiongfei Wang & Frede Blaabjerg, 2024. "Impact of Synchronous Condensers’ Ratings on Mitigating Subsynchronous Oscillations in Wind Farms," Energies, MDPI, vol. 17(7), pages 1-20, April.

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