Control Strategy of Hybrid Four-Terminal HVDC Transmission System Dedicated for Long-Distance Power Delivery from Multiple Energy Bases
Meng Peiyu1, Wang Zhibing2, Chi Yongning2, Yang Ruizhang1, Xiang Wang1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing 100192 China
Abstract：In order to transmit large-scale renewable energy to different load centers over long distances, this paper proposes a hybrid four-terminal DC transmission system suitable for long-distance transmission of multiple energy bases. The system adopts a line commutated converter (LCC) and a modular multilevel converter (MMC) as the sending terminals, and two MMC converters at the inverter side. The system's topology and mathematical model are introduced, a coordinated control scheme is designed, and the start-up process of the hybrid DC transmission system is analyzed. Based on the coordination between the control strategy of converter and DC side switch, a non-blocking DC fault ride-through strategy for a hybrid four-terminal power grid is designed. A four-terminal power grid simulation model was built in PSCAD/EMTDC to verify the system's operating characteristics under start-up, DC fault, and non-blocking ride-through conditions. The research results show that the system can provide a new option for large-scale distribution of renewable energy.
孟沛彧, 王志冰, 迟永宁, 杨睿璋, 向往. 适应多能源基地远距离输送电能的混合四端直流输电系统控制策略研究[J]. 电工技术学报, 2020, 35(zk2): 523-534.
Meng Peiyu, Wang Zhibing, Chi Yongning, Yang Ruizhang, Xiang Wang. Control Strategy of Hybrid Four-Terminal HVDC Transmission System Dedicated for Long-Distance Power Delivery from Multiple Energy Bases. Transactions of China Electrotechnical Society, 2020, 35(zk2): 523-534.
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2020, Vol. 35 
