Open AccessNew scheme of UHVDC transmission line protection based on Chebyshev window filter
Author(s) -
Li Zhenxing,
Tan Hong
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0468
Subject(s) - transmission line , harmonics , fault (geology) , chebyshev filter , filter (signal processing) , electric power transmission , electronic engineering , computer science , transmission (telecommunications) , capacitance , line (geometry) , electrical engineering , control theory (sociology) , topology (electrical circuits) , voltage , engineering , mathematics , physics , geometry , control (management) , electrode , quantum mechanics , artificial intelligence , seismology , geology
Based on the analysis of the fault current characteristics in ultra‐high‐voltage DC (UHVDC) transmission lines, a new method to identify the fault by using the polarity of the current mutation is proposed here. Firstly, the protection scheme here is set up as the distributed parameter model to eliminate the influence of distributed capacitance current and data synchronisation on protection. Furthermore, not only the characteristic harmonics of the DC side but also the electromagnetic coupling of the bipolar DC lines and the interference of the high‐frequency pulse are considered; the Chebyshev filter is used to select the low‐frequency component. Finally, the results of PSCAD/EMTDC simulation show that the proposed scheme not only has the advantages of reliable and low sampling rate, but also has the ability to withstand the transition resistance and the lightning resistance. In a word, the scheme has important reference value for the actual UHVDC projects.