电力系统保护与控制2024，Vol.52Issue(1)：109-120,12.DOI:10.19783/j.cnki.pspc.230581
基于行波模态分解的特高压直流输电线路双端行波测距方法
A double-terminal fault location method for UHVDC transmission lines based on traveling wave mode decomposition
摘要
Abstract
The fault location algorithm of an ultra-high voltage direct current(LCC-UHVDC)transmission system based on a thyristor converter plays an important role in the safe and stable operation of the smart grid.There are shortcomings of low accuracy and poor speed of fault location methods for long distance UHVDC transmission systems.Thus a double terminal traveling wave fault location method based on variational mode decomposition(VMD)and Teager energy operator(VMD)is proposed.First,the propagation characteristics of a fault voltage traveling wave in LCC-UHVDC lines are studied.Based on the characteristic that zero-mode voltage attenuates markedly with line propagation,the time-frequency characteristics of a zero-mode voltage traveling wave at a sampling point are extracted by a VMD algorithm.To solve the mode aliasing problem caused by the improper selection of VMD parameters,Kullback-Leibler(K-L)divergence is used to optimize the extracted modal indices.Then,TEO is used to extract the instantaneous energy spectrum of the decomposed signal,and the arrival time of the wave head is calibrated accurately.Finally,the fault distance is solved iteratively by the two-terminal iterative fault location method.The±800 kV LCC-UHVDC simulation model is established in PSCAD/EMTDC for verification.The results show that the proposed method has strong robustness with different fault locations,transition resistance and fault types.关键词
特高压直流输电/变分模态分解/Teager能量算子/故障测距/电压行波Key words
UHVDC/VMD/Teager energy operator/fault location/voltage traveling wave引用本文复制引用
王洪彬,周念成,王伟,王强钢,于大川,周丹莹,吕元正..基于行波模态分解的特高压直流输电线路双端行波测距方法[J].电力系统保护与控制,2024,52(1):109-120,12.基金项目
国家自然科学基金项目资助(U22B6006) （U22B6006）
国网重庆市电力公司科技项目资助(2022渝电科技10#) This work is supported by the National Natural Science Foundation of China(No.U22B6006). （2022渝电科技10#）
