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DOI:10.35833/MPCE.2022.000363
Impact of Different AC Voltage Control Modes of Wind-farm-side MMC on Stability of MMC-HVDC with Offshore Wind Farms
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Author: Hongfei Lin1, Tao Xue2, 3, Jing Lyu1, Xu Cai1

Author Affiliation: 1. Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
3. Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Foundation:
This work was supported by the National Natural Science Foundation of China (No. 51907125).
Abstract: Wind-farm-side modular multilevel converters (WFMMCs) used in modular multilevel converter based high-voltage direct current (MMC-HVDC) transmission systems must be able to control the AC grid voltage in offshore wind farms. Different AC voltage control strategies can significantly affect the dynamic characteristics of WFMMCs. However, existing studies have not provided a general methodology of controller parameter design, and few comparative studies have been conducted on control performance under varying operating conditions as well as the effects of different AC voltage control modes (AVCMs) on the stability of MMC-HVDCs with offshore wind farms. This paper provides a controller parameter design method for AVCMs, which is tested in various operating scenarios. Sequence impedance models of offshore wind farms and WFMMCs under different AVCMs are then developed. The effects of AVCMs on the small-signal stability of the interconnected system are then analyzed and compared using the impedance-based method. Finally, case studies are conducted on a practical MMC-HVDC system with offshore wind farms to verify the theoretical analysis.

Keywords:
Offshore wind farm ; modular multilevel converter based high-voltage direct current (MMC-HVDC) ; AC voltage control ; stability ; dynamic response characteristics
Received:June 22, 2022               Online Time:2023/09/20
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