Harmonics In a Traction Power Supply System

Y. Du and Z.H.Yuan (PRC)


Harmonics, traction power


With the boom of power electronic devices in electric railway, harmonics in power systems become increasingly of concern. This paper presents a case study on harmonics in a traction power supply system. The system model is developed by including the frequency-variant impedance. A method for estimating diversity factor of harmonic currents is proposed. A parallel resonance in the system is noted, which results from the cable capacitance and transformer inductance. With the diversity factor obtained from the measurement, harmonic voltages at a PCC are evaluated against the limits given in IEEE Standard 519 1992.

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