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In this paper, an identification method of the oscillation current and the short-circuit fault current in DC traction power supply system based on empirical mode decomposition (EMD) and approximate entropy is proposed. The feeder current is decomposed by means of EMD technique, and the sum of the approximate entropy of each intrinsic mode function (IMF) is calculated. Thus, the characteristic value...
In this paper, a method of identifying the short-circuit fault current in DC traction power supply system based on local mean decomposition (LMD) and time-frequency entropy is proposed. Firstly, the feeder current signal of DC traction power supply system is analyzed by means of LMD, by which the LMD time-frequency distribution can be obtained. Secondly, the LMD time-frequency plane is divided into...
Nowadays, harmonic active power direction method is the most widely applied method to judge the main harmonic source, but the power direction method is theoretically different from harmonic current superposition principle. In this paper, it has been got that the power direction method and harmonic current superposition principle are different through mathematical analysis, and the precise conditions...
Aiming at the low-frequency oscillation of traction network caused by the high-speed railway electric motor units (EMUs), when transient current control strategy (TCCS) based on traditional PI controller is adopted by the line-side converter (LSC) of the EMUs, by analyzing the PI controller parameter adjustment, it is found that this suppression measure has its limitations. In order to overcome the...
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