Open AccessWavelet‐based EMTR method for fault location of VSC‐HVDC transmission lines
Author(s) -
Zhang Xipeng,
Tai Nengling,
Zheng Xiaodong,
Huang Wentao
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8790
Subject(s) - fault (geology) , wavelet , voltage source , electric power transmission , high voltage direct current , transmission line , control theory (sociology) , filter (signal processing) , line (geometry) , computer science , electronic engineering , voltage , engineering , direct current , electrical engineering , mathematics , geology , artificial intelligence , seismology , geometry , control (management)
A wavelet‐based electromagnetic time reversal method for locating faults in voltage source converter‐high‐voltage direct current (VSC‐HVDC) transmission lines is proposed in this study. This principle, firstly, is to use wavelet decomposition to filter the 1‐mode fault currents, which are recorded at ends of the transmission line. Secondly, the filtered currents are mirrored on time axes, which called time reversal. Thirdly, the time‐reversed currents are set as current sources at ends of the lossless mirror lines. Through assuming a fault at each point of line, the assumed fault currents are calculated, and the RMS of fault current at actual fault location is maximal according to a strict scientific proof. Theoretically, the Wavelet‐based Electromagnetic Time Reversal (WEMTR) method is robust against fault types and resistance. A multilevel converter‐HVDC system is established in Power Systems Computer‐Aided Design (PSCAD)/Electromagnetic Transients including DC (EMTDC) to verify the feasibility of the proposed method, and the transmission line is simulated by frequency independent phase model. The results show that, the fault location can be calculated exactly without high sampling rates.