High-Performance Generalized ADPWM Algorithm for VSI Fed IM Drives for Reduced Switching Losses

In this paper a high performance generalized advanced discontinuous pulse width modulation (ADPWM) algorithm for voltage source inverter (VSI) fed induction motor drives is proposed. The proposed ADPWM method uses two categories of DPWM sequences, 012, 721, 0121 and 7212 which not only reduces the inverter switching losses but also reduces the line current distortion during medium to high speed operations. However analysis in this paper is limited to inverter switching losses. In this paper it is shown that, utilizing a set of DPWM sequences and by changing the zero state at any spatial angle γ = α where γ is between 0 and 60an infinite number of ADPWM methods can be generated which are categorized as “continual clamping” and “split clamping” sequences. It will be shown analytically and through simulation that nearly 40% reduction in inverter switching losses and 36% reduction in steady state line current distortion (compared with the CSVPWM) can be achieved with the proposed ADPWM methods at high power factor loads.