电力系统保护与控制2024，Vol.52Issue(1)：121-132,12.DOI:10.19783/j.cnki.pspc.230853
基于CRS-LMD和SVD的MMC-HVDC线路故障测距方法
Fault location of an MMC-HVDC line based on CRS-LMD and SVD
摘要
Abstract
Uncertainty on the fault traveling wave velocity,the difficulty of wave head extraction,the randomness of noise interference and other factors in DC lines restrict the application of fault location technology in a DC power grid.To reduce the influence of the above factors on positioning accuracy,a fault location method based on characteristic rational spline LMD(CRS-LMD)and singular value decomposition(SVD)is proposed.First,the optimal pole coefficient is selected with the use of the feature scale,and tightness of the fitting curve is adjusted by rational spline interpolation.The local mean decomposition of the fault voltage traveling wave is realized.Secondly,SVD is used to extract the fault travelling wave head accurately.Finally,a simulation model of the Zhangbei±500 kV flexible DC power grid is built in PSCAD/EMTDC to simulate various fault situations and output fault data.Matlab is used to process the fault data and verify the positioning algorithm.The results show that the proposed algorithm can realize fault location with different fault distances and fault types,and guarantee high accuracy under when there is superimposed noise and transition resistance.关键词
串柔性直流电网/有理样条插值/局部均值分解/奇异值分解/行波提取/故障测距Key words
flexible DC grid/rational spline interpolation/LMD/SVD/traveling wave extraction/fault location引用本文复制引用
贺宇阳,马千里,于飞,刘喜梅..基于CRS-LMD和SVD的MMC-HVDC线路故障测距方法[J].电力系统保护与控制,2024,52(1):121-132,12.基金项目
国家自然科学基金项目资助(62103218) （62103218）
山东省自然科学基金项目资助(ZR2020MF081) This work is supported by the National Natural Science Foundation of China(No.62103218). （ZR2020MF081）
