Harmonic Analysis of Laboratory-Based Power System Utilizing Passive Filter for High-Speed Railway Traction Applications

Railway electrification has posed a challenge for power quality in railway networks due to their unique characteristics. This research paper explores the impact of an inductor filter on high-order harmonic currents generated by the pulse-width modulation (PWM) converter in the traction drive of high-speed railway (HSR) systems. The paper begins by providing an overview of the traction power transfer system (TPTS) in a HSR and models a permanent magnet synchronous motor (PMSM) for traction applications. Then, a laboratory-based system (LBS) HSR is built to replicate the energy flow characteristics observed in a real-world HSR system. The LBS-HSR is modeled in Matlab/Simulink and is utilized to analyze the harmonic spectrum of current on the grid and motor terminal under various operating conditions. Furthermore, the paper investigates the impact of the inductor filter on other system components such as the input current of the converter and the voltage on the DC capacitor. Finally, a laboratory-based HSR system is developed on experiment and validated against the results obtained from the simulation model.