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

doi:10.19595/j.cnki.1000-6753.tces.191684

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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.

Key words： LCC-VSC hybrid HVDC transmission system renewable energy transmission multi-terminal HVDC grids control strategy fault ride-through

Received: 05 December 2019

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TM721

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	Meng Peiyu
	Wang Zhibing
	Chi Yongning
	Yang Ruizhang
	Xiang Wang

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Meng Peiyu,Wang Zhibing,Chi Yongning等. Control Strategy of Hybrid Four-Terminal HVDC Transmission System Dedicated for Long-Distance Power Delivery from Multiple Energy Bases[J]. Transactions of China Electrotechnical Society, 2020, 35(zk2): 523-534.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191684 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/Izk2/523

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