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Neutral point clamped (NPC) multilevel inverter fed high power drives, operating at low switching frequency, are prone to low-order torque pulsations. This paper considers a specific case of four switching angles per quarter cycle of the pole voltage. For such cases, apart from maintaining the fundamental component, three voltage harmonics can be eliminated. Consequently, only one torque harmonic...
Half-wave symmetry (HWS) and quarter-wave symmetry (QWS) are traditionally associated with high waveform quality of the inverter output voltage, particularly when the ratio of switching frequency to the modulating frequency (i.e. pulse number, P) is quite low. This paper investigates and establishes the possibility of high-quality pulse-width modulated waveforms with HWS, but without QWS, for P =...
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