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FLC-Based Ultra-Low-Frequency Oscillation Suppression Scheme for Interconnected Power Grids

Author

Listed:
  • Chao Xing

    (Power Science Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, China)

  • Mingqun Liu

    (Power Science Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, China)

  • Junzhen Peng

    (Power Science Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, China)

  • Yuhong Wang

    (School of Electrical Engineering, Sichuan University, Chengdu 610065, China)

  • Yichen Zhou

    (School of Electrical Engineering, Sichuan University, Chengdu 610065, China)

  • Zongsheng Zheng

    (School of Electrical Engineering, Sichuan University, Chengdu 610065, China)

  • Shilin Gao

    (School of Electrical Engineering, Sichuan University, Chengdu 610065, China)

  • Jianquan Liao

    (School of Electrical Engineering, Sichuan University, Chengdu 610065, China)

Abstract

The appearance of ultra-low-frequency oscillations in the grid at the sending end, after asynchronous grid interconnection, poses a significant threat to the stable operation of the system. For post-asynchronous interconnection in a multi-DC transmission system, an investigation is conducted to analyze the causes of ultra-low-frequency oscillations and the utilization of a Frequency Limit Controller (FLC) which aims to suppress these oscillations. Furthermore, a method is developed to rank DC sensitivity, considering the hydroelectric distribution in the sending-end grid, by combining the DC FLC impact factor and DC control sensitivity. Subsequently, a novel approach for ultra-low-frequency oscillation suppression is proposed. This approach employs the stochastic subspace method for parameter estimation and the NSGA-II optimization algorithm to convert the multi-DC optimization challenge into multiple sequential cyclic optimization problems, each focusing on a single DC, ensuring a more effective suppression of ultra-low-frequency oscillations. The proposed scheme’s effectiveness is validated through simulations using a specific locations’ interconnected power grid.

Suggested Citation

  • Chao Xing & Mingqun Liu & Junzhen Peng & Yuhong Wang & Yichen Zhou & Zongsheng Zheng & Shilin Gao & Jianquan Liao, 2024. "FLC-Based Ultra-Low-Frequency Oscillation Suppression Scheme for Interconnected Power Grids," Energies, MDPI, vol. 17(6), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1300-:d:1353539
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