Ground Leakage Current Caused by Common-Mode Voltage of PWM inverter


  • Jerzy Ryszard Szymański Kazimierz Pulaski University of Technology and Humanities in Radom
  • Marta Żurek-Mortka Kazimierz Pulaski University of Technology and Humanities in Radom



common-mode voltage, differential-mode voltage, PWM modulation, three-phase traction voltage inverter, two-level PWM inverter


In railway tractive vehicles, three-phase PWM (Pulse Width Modulation) inverters generate parasitic Differential-Mode Voltages (DMV) and Common-Mode Voltages (CMV). Parasitic voltages are a side effect of using the width modulation to shape the phase-to-phase inverter?s voltage. In this article, the authors present a mathematical description of the DM and CM voltages and carry out their spectral analysis. Based on the spectral harmonics analysis, the authors present a method for filtration of harmonics of DM and CM voltages aimed at limiting the capacitance parasitic currents: due to DM voltage ? phase-to-phase parasitic current and CM voltage ? ground parasitic currents. As the final result of the tests, almost complete elimination of leakage parasitic current form PE shock protection system was achieved.


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