%A Shu Tian, Yao Xu, Qixiang Yang %T A Faulty Feeder Detection Method using Parameter-Optimization Variational Mode Decomposition and Impedance Characteristics of Zero-Sequence Current in Resonant Earthed System %0 Journal Article %D 2020 %J Int J Performability Eng %R 10.23940/ijpe.20.12.p5.18881899 %P 1888-1899 %V 16 %N 12 %U {https://www.ijpe-online.com/CN/abstract/article_4519.shtml} %8 2020-12-30 %X It is difficult to detect the faulty feeder when a single-phase-to-ground (SPG) fault occurs in the resonant earthed system due to the low amplitude of current, and different faulty conditions leading to different components of transient zero-sequence current (TZSC) make the detection much harder. A novel faulty feeder detection method based on the parameter-optimization variational mode decomposition (VMD) is proposed in this paper. Firstly, utilize the fruit fly optimization algorithm (FOA) to obtain the optimal parameter combination [K, α] of VMD for the fault components extracted accurately. Second, considering that low-frequency decaying DC components only exist in the faulty feeder, the modal energy of decaying DC components of each feeder are calculated for a preliminary judgment. Then, due to the amplitude and polarity of the high-frequency transient capacitive current are both different between the faulty and sound feeder, the correlation analysis of high-frequency components is utilized to reflect the mismatch of zero-sequence current waveform in high frequency band between faulty and sound feeder. Finally, the dual criterion combining modal energy of decaying DC components in low-frequency band and waveform similarity in high-frequency band is constituted. A large number of MATLAB/Simulink simulation results show the great effectiveness and reliability of this method at different fault conditions.