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Impedance Aggregation Method of Multiple Wind Turbines and Accuracy Analysis

Author

Listed:
  • Liang Chen

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Heng Nian

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Yunyang Xu

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

The sequence domain impedance modeling of wind turbines (WTs) has been widely used in the stability analysis between WTs and weak grids with high line impedance. An aggregated impedance model of the wind farm is required in the system-level analysis. However, directly aggregating WT small-signal impedance models will lead to an inaccurate aggregated impedance model due to the mismatch of reference frame definitions among different WT subsystems, which may lead to inaccuracy in the stability analysis. In this paper, we analyze the impacts of the reference frame mismatch between a local small-signal impedance model and a global one on the accuracy of aggregated impedance and the accuracy of impedance-based stability analysis. The results revealed that the impact is related to the power distribution of the studied network. It was found that that the influence of mismatch on stability analysis became subtle when subsystems were balanced loaded. Considering that balanced loading is a common configuration of the practical application, direct impedance aggregation by local small-signal models can be applied due to its acceptable accuracy.

Suggested Citation

  • Liang Chen & Heng Nian & Yunyang Xu, 2019. "Impedance Aggregation Method of Multiple Wind Turbines and Accuracy Analysis," Energies, MDPI, vol. 12(11), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2035-:d:234825
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    References listed on IDEAS

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    1. Segura-Heras, Isidoro & Escrivá-Escrivá, Guillermo & Alcázar-Ortega, Manuel, 2011. "Wind farm electrical power production model for load flow analysis," Renewable Energy, Elsevier, vol. 36(3), pages 1008-1013.
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    Cited by:

    1. Li Sun & Hongbo Liu & Chenglian Ma, 2020. "AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures," Energies, MDPI, vol. 13(5), pages 1-14, March.
    2. Antonio T. Alexandridis, 2020. "Modern Power System Dynamics, Stability and Control," Energies, MDPI, vol. 13(15), pages 1-8, July.

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