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Comparison of ElectroMagnetic Emissions & Harmonic Analysis of 20 HP Motor Controlled by 3L NPC Inverter
  • Abhishek Bansal
Abhishek Bansal
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In this paper, thirteen experiments are performed to measure the conducted electromagnetic emissions namely common mode and differential mode noises along with time-varying spectra. These emissions are generated by switching IGBTs of three phase three level inverter whose switching pulse width modulated frequency is varied at twelve frequencies from 8 kHz to 120 kHZ. Two equipments under test (EUT) are simultaneously measured for emissions using CE102 of MIL-STD-461G standard with line impedance stabilization network (LISN) and spectrum analyzer. The EUTs are inverter and asynchronous machine, where the inverter is nonlinear space vector modulated three-phase three-level diode neutral point clamped inverter, and the asynchronous machine is non-linear rotating machine, 20HP (15 kW), 400V, 50Hz, Y-winding, squirrel-cage induction motor. The harmonic distortion measurements namely total harmonic distortion(THD), THD in percentage, signal-to-noise ratio(SNR), signal-to-noise and distortion ratio(SINAD) and spurious-free dynamic range(SFDR) are calculated, tabulated and plotted at 15 harmonics resulting from the emissions. The time varying spectra is captured using Welch’s method and Short-time Fourier transform and is also submitted as dataset for each phase of the asynchronous machine and the inverter.