中文摘要：

在分析感应滤波型直流输电系统换相特性的基础上，研究不同类型系统接地故障和系统参数变化对感应滤波型直流输电系统换相失败免疫能力的影响。仿真和动模实验表明：感应滤波技术的应用增强了直流输电系统对换相失败的抵御能力，系统的换相特性得到改善．系统网侧电压和阀侧电压波形畸变得到较好改善．换相角明显减小：电感性故障是最容易导致新型直流输电系统发生换相失败的故障类型，感应滤波型直流输电系统对电感性故障的换相失败免疫力较传统直流输电系统明显增强：感应滤波型直流输电系统对换相失败的抵御能力随着逆变侧交流系统强度增加、直流传输功率降低及阀侧感应滤波器的投入而增强。

英文摘要：

Based on the analysis of commutation characteristics of inductive filtering HVDC system,the impact of different grounding faults and system parameter variation on the commutation failure immunity ability of the system is researched. Simulation and dynamic experiment show that,the application of inductive filtering technology enhances the resistant ability of HVDC system against the commutation failure,improves the commutation characteristics of the system and the waveform distortion of grid-side voltage and valve-side voltage,and reduces the commutation angle. Inductive fault is the type most likely causing the system commutation failure and the ability of inductive filtering HVDC system immune to commutation failure is obviously stronger than that of traditional HVDC system. Its ability immune to commutation failure increases along with the improvement of inverter-side AC system strength,the reduction of DC transmission power and the input of valve-side inductive filter.