Analysis of Advanced Space Vector PWM Techniques Extended to Over-Modulation Region for Induction Machine Drive

This paper focuses on the extension and associated analysis of advanced Space Vector PWM techniques (SVPWM) reported in the literature to the over-modulation zone of operation. The over-modulation operation is separated into two zones in conventional manner namely, zone-I and zone-II. The combination of sequence 0121 (in under modulation zone) and 121 (in over modulation zone during switching interval only) to achieve reduction in high frequency flux ripple while the low frequency components due to over-modulation remains nearly unchanged. This method is compared with 012 (in under modulation zone) and 12 (in over modulation zone during switching interval only) sequence. In both the cases, a smooth transition between linear and over modulation zones can be achieved. The analysis is carried out for computing RMS stator flux ripple and the harmonic distortion factor for different frequency of operation. The theoretical observation are verified through simulation and experimental studies.