Separate Poles Mode for Large-Capacity HVDC System

[摘要] This paper proposes a novel connection mode, separate poles mode (SPM), for large-capacity HVDC systems. The proposed mode focuses on the core issues of HVDC connection in interconnected power grids and principally aims at increasing effective electric distance between poles, which helps to mitigate the interaction problems between AC system and DC system. Receiving end of bipolar HVDC has been divided into different inverter stations under the mode, and thus significantly alleviates difficulties in power transmission and consumption of receiving-end AC grids. By investigating the changes of multi-feed short-circuit ratio (MISCR), finding that HVDC with SPM shows critical impacts upon itself and other HVDC systems with conventional connection mode, which demonstrates that SPM can make balance between MISCR increase and short-circuit current limit.

[发布机构] South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou, China^1

[效力级别] 电工学

[关键词] AC systems;Connection mode;Conventional connections;HVDC systems;Interaction problems;Interconnected power grid;Multi-feed;Short circuit ratio