Single-phase grounding fault line selection method combining zero sequence current signal components
In order to address the problems that arise when a single-phase ground fault occurs in the current mine grounding power supply system,we propose a line selection method based on parameter optimization variational mode decomposition(VMD)combined with the thorough component of zero-sequence current.These faults are caused by the difficulty of extracting signal features from the arc suppression coil and the significant influence of noise signal.In this method,the whale optimized VMD is used to decompose the zero-sequence current signal,and the fault line is identified according to multiple criteria of non-power frequency component signal energy,power frequency component signal polarity and waveform correlation.RTDS/RSCAD is used to build a mine power supply system model,and different fault conditions are simulated and tested,including fault grounding resistance,fault initial phase angle,and fault point location of different fault lines.The results show that this method has a more intuitive line selection effect under the premise of ensuring accuracy and reliability,regardless of the fault conditions.
single phase ground faultVMDwhale optimization algorithmcomposite signal componentwaveform correlation
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