High-frequency resonances occur frequently in traction power supply systems of high-speed railways in China. In this study, the autotransformer-fed traction power supply system for a high-speed railway was first described, and then the high-frequency resonance mechanism was analysed. On the basis of this, the input impedance at the train's pantograph was applied to identify the resonant frequencies, and a second-order high-pass filter was designed by solving the minimum total input impedance with the steepest descent method. The designed filter can not only suppress the existing resonance, but also avoid a new resonance occurrence. Finally, the resonance mechanism analysis and the designed filter are verified by investigating the harmonic spectrum of the pantograph voltage in a MATLAB/Simulink-based co-simulation.

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High-frequency resonance suppression of high-speed railways in China

References

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