标题：Emergency control strategy of PV for suppressing transient overvoltage peak in LCC-HVDC infeed power system

作者：Boliang Lou ; Longfei Wang ; Rui Zhang ; Wen Hua ; Jiabing Hu

摘要：The transient overvoltage appears commonly in LCC-HVDC infeed power system and could lead to tripping of adjacent PV and cascading failures, especially in the peak stage. The current solutions mainly focus on improving short circuit capacity and the response of reactive power compensation devices. However, these solutions need extra devices or could not response rapidly to the voltage peak. Thus, this paper proposes an additional emergency control strategy of PV to suppress overvoltage peak, which utilizes PV's rapid adjustment capacity. The topology of a practical system and controls of key devices are introduced first. Then, the process of transient recovery overvoltage peak is analysed. Further, an emergency control strategy is proposed. An additional signal, which is formed by the error between terminal voltage measurement and its reference, is attached to the output voltage reference of PV to provide emergency reactive power support. Finally, the feasibility and effectiveness of the proposed control strategy are validated by simulation results.

发表于：8th Renewable Power Generation Conference (RPG 2019)