LI Bin,ZHANG Jihang,LIU Haijin,et al.Fault location of HVDC transmission lines based on waveform similarity analysis[J].Electric Power Automation Equipment,2019,39(09):27-32.
LI Bin,ZHANG Jihang,LIU Haijin,et al.Fault location of HVDC transmission lines based on waveform similarity analysis[J].Electric Power Automation Equipment,2019,39(09):27-32.DOI: 10.16081/j.epae.201909001.
Fault location of HVDC transmission lines based on waveform similarity analysis
In order to overcome the shortcomings of the traveling wave fault location principle that performs worse in high-resistance fault and requires extremely high sampling frequency,a fault location method based on waveform similarity for HVDC(High Voltage Direct Current) power transmission lines is proposed. Based on the functional relationship between positive and negative differential currents and fault point current,the waveform similarity between positive and negative differential currents is analyzed by using Pearson correlation coefficient and the corresponding information of fault location is extracted. The proposed method takes use of time-domain information of voltages and currents at both ends,is less affected by the transition resistance and noise,and shows high reliability. PSCAD/EMTDC simulation verifies that the proposed method can achieve accurate fault location of the full length of power transmission line.
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