The analysis of time-varying resonances in the power supply line of high speed trains

The harmonic currents generated by the line-side converter of high speed trains may cause the time-varying resonances when the harmonic frequency is close to the resonance frequency of the power supply line. It may destroy the facilities in the power supply range and affect the operation of trains. To avoid the affection, the characteristic of resonance impedance is calculated and simulated with a chain network topology in AT-fed power supply system. To take the coupled relation between the system and trains, a fundamental power source and harmonic voltage source traction drive system combining model is proposed instead of the harmonic current source model. Take the CRH380A and Beijing-Shanghai high speed railway as illustration. In this paper, the regularity of resonance frequencies and the characteristic of resonance voltage are expounded and analyzed in details.