Sixth harmonic‐based fault location for VSC‐DC distribution systems. Issue 14 (21st July 2017)

• Record Type: Journal Article
• Authors: Li, Meng; Jia, Ke; Bi, Tianshu; Yang, Qixun
• Is Part Of: IET generation, transmission & distribution. Volume 11:Issue 14(2017)
• Page Start: 3485
• Page End: 3490
• Publication Date: 2017-07-21
• Subjects: fault location -- power distribution faults -- power distribution protection -- voltage‐source convertors -- maintenance engineering -- equivalent circuits -- discrete Fourier transforms; Sixth harmonic‐based fault location -- VSC‐DC distribution system -- voltage source converter‐DC distribution system line maintenance -- fault isolation -- equivalent feeding‐stage circuit -- improved discrete Fourier transform algorithm -- IDFT -- decaying periodic -- DC components -- PSCAD/EMTDC -- local measurements -- sampling frequency -- power electronics -- frequency 9.6 kHz; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2016.1865
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Accurate fault location methods are of major significance to the line maintenance of voltage source converter (VSC)‐DC distribution systems. However, power electronics change the fault‐characteristics, and the new fault theory is not fully mature. In addition, rapid fault isolation leaves little information for fault location. Fault location for VSC‐DC distribution systems is still a big challenge. The proposed fault location method is developed based on an equivalent feeding‐stage circuit derived herein. The line quantities sixth‐harmonics are used, and an improved discrete Fourier transform algorithm (IDFT) is proposed to remove the influence of both decaying periodic and DC components. Simulation results on PSCAD/EMTDC verified the feasibility of the proposed fault location and IDFT algorithms. Using local measurements with the sampling frequency of 9.6 kHz, the method can locate fault position within 10 ms and with less than 2% error.