In order to improve the reactive power regulation capability of UHV AC-DC hybrid power grids, State Grid Corporation of China has recently installed a large number of large-scale synchronous condensers in the sending and receiving ends. At present, the transient and dynamic characteristics of large-scale synchronous condensers are complex, which are mainly affected by the motor body and excitation system and also related to the structure and fault of UHV AC-DC power grid. In order to fully utilize and enhance the supporting role of large-scale synchronous condensers to UHV grid voltage, and meet the demand of UHV AC-DC hybrid power grid for synchronous condensers fast reactive power output, this paper builds a PSCAD/EMTDC simulation model according to the UHV DC Yunnan-Guangdong ±800 kV grid structure. Combined with the actual operating characteristics of Hubei Power Grid, the influence of large-scale condensers on the voltage of the AC and DC side grids at the receiving side is studied. Besides, the reactive power support function of the synchronous condensers to the system voltage and its fast response mechanism are studied, which will give the reference and recommendations for State Grid Corporation of China in the installation of synchronous condensers in future UHVDC grid.

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Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control
Department of Electronics

Xiao, F. (Fan), Wang, T. (Tao), Gao, Y. (Yang), Rao, Y. (Yuze), Ai, Q. (Qian), & Wang, X. (2019). Research on reactive power compensation and fast response mechanism of synchronous condenser based on UHVAC/DC hybrid grid 基于特高压交直流混联电网的调相机无功补偿及快速响应机制研究. Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control, 47(17), 93–100. doi:10.19783/j.cnki.pspc.181140