晁武杰,李智诚,唐志军,林国栋,郭健生,刘龙辉.基于MMC的柔性直流输电线路双极性故障检测方法研究[J].电测与仪表,2023,60(9):165-170. Chao Wujie,Li Zhicheng,Tang Zhijun,Lin Guodong,Guo Jiansheng,Liu Longhui.Research of bipolar fault detection method based on the MMC flexible DC transmission lines[J].Electrical Measurement & Instrumentation,2023,60(9):165-170.
基于MMC的柔性直流输电线路双极性故障检测方法研究
Research of bipolar fault detection method based on the MMC flexible DC transmission lines
In order to quickly and accurately identify the DC side faults in modular multi-level multi-terminal flexible DC transmission lines, this paper presents a bipolar fault detection method for modular multi-level multi-terminal flexible DC transmission lines based on time characteristics. The traveling wave and converter voltage fluctuation under the condition of bipolar fault are analyzed. The difference of the first voltage traveling wave between the fault line and the non-fault line is used to detect the fault quickly. The rationality of bipolar fault detection method is verified by simulation. The results show that the proposed method is not affected by the transition resistance and less affected by fault distance, so it can detect the bipolar faults quickly.
