Frequency Stability Control Strategy for Voltage Source Converter-Based Multi-Terminal DC Transmission System

Chao Xing, Mingqun Liu, Junzhen Peng, Yuhong Wang (), Chengbo Shang, Zongsheng Zheng, Jianquan Liao and Shilin Gao
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Chao Xing: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China
Mingqun Liu: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China
Junzhen Peng: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China
Yuhong Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Chengbo Shang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Zongsheng Zheng: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Jianquan Liao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Shilin Gao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2024, vol. 17, issue 5, 1-15

Abstract: The voltage source converter-based multi-terminal DC transmission (VSC-MTDC) system can use additional frequency control to respond to the frequency change of faulty AC system. However, the control coefficient of traditional additional frequency control is mostly fixed, and the control flexibility is insufficient, so it cannot be adjusted adaptively according to the frequency change of the system. Therefore, a frequency control strategy of the VSC-MTDC system based on fuzzy logic control is proposed. Based on the DC voltage slope controller, this strategy introduces an additional frequency controller based on fuzzy logic control, takes the frequency deviation and frequency change rate as the additional controller input, and dynamically adjusts the control quantity through the fuzzy logic control link to realize the adaptive adjustment of the VSC-MTDC system to the AC system’s frequency. Finally, a three-terminal flexible HVDC system is built on the PSCAD/EMTDC simulation platform for simulation verification. The results show that the proposed control strategy can effectively use the flexible DC system to support the frequency of the AC system and significantly improve the frequency stability of the faulty AC system.

Keywords: frequency stability; VSC-MTDC; additional frequency control; fuzzy logic control; adaptive modulation (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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