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

Chao Xing, Mingqun Liu, Junzhen Peng, Yuhong Wang (), Yichen Zhou, Zongsheng Zheng, Shilin Gao and Jianquan Liao
Additional contact information
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

Energies, 2024, vol. 17, issue 6, 1-14

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.

Keywords: ultra-low-frequency oscillations; frequency limit controller; stochastic subspace method; NSGA-II optimization algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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