感应滤波技术对多馈入直流输电系统换相失败的影响

基于CIGRE标准模型建立了含感应滤波装备的新型多馈入直流输电系统仿真模型.结合多馈入有效短路比、多馈入交互因子和换相失败免疫因子的定义，对比分析了不同故障类型、不同故障时刻条件下的换相失败免疫因子变化规律；并对发生本地换相失败和并发换相失败条件下，交流系统强度如何影响多馈入直流输电系统抵御换相失败的能力进行了对比分析研究.结果表明：感应滤波技术具有降低多馈入直流输电系统的交互因子、提高换相失败免疫因子及增强多馈入直流输电抵御并发换相失败的能力.

Commutation Failure Analysis of a New Multi-Infeed HVDC Transmission System

A new multi-infeed HVDC system that comprises inductive filtering device has been modeled on the basis of the CIGRE model. The definitions of Multi-infeed Effective Short Current Ratio (MESCR), Multi-infeed Interaction Factor (MIIF) and Commutation Failure Immunity Index (CFII) have been explained. The varying pattern of CFII in different fault types and different fault time has been analysed in comparison. The impact of the resisting capability on continuation commutation failure of multi-infeed HVDC systems by ac system strengths in the conditions of local commutation failure and concurrent commutation failure have also been studied in comparison. The theoretical calculation and simulation analysis shows that the inductive filtering device enhances the MESCR and CFII of the multi-infeed HVDC system and significantly decreases the risk of concurrent commutation failure and local concurrent commutation.