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The harmonics-related performance characteristics of the common-mode-voltage-eliminating space vector pulse width modulation (CMVE-SVPWM) technique for three-phase multilevel voltage source inverter (MLVSI), based on the recently offered quarter-wave-symmetric space vector pulse width modulation (QWS-SVPWM) algorithm, are investigated. Namely, the dependences of the output voltage THD and three low-order weighted THDs values on the phase voltage amplitude modulation index are obtained by LabVIEW simulation for the three low, multiple of 12, values of frequency modulation index and the considerably extended range of the amplitude modulation index. Like the baseline QWS-SVPWM algorithm, the CMVE-SVPWM technique keeps the quarter-wave symmetry of the star (phase-to-neutral) and delta (phase-to-phase) voltages and is intended for MLVSI of any arbitrary topology with any arbitrary number of generated equal voltage levels. The zero-common-mode-voltage MLVSI space vectors are being applied, producing the zero value of the voltage across the neutral point of the load and the inverter system ground point. To this end, relative values of the MLVSI phase load voltages, referred to the three-phase load common star point (phase-to-neutral load voltages) are being set as the reference ones and being processed. |
