Reducing losses in multilevel coupled inductor inverters using interleaved discontinuous SVPWM

This paper presents generalized interleaved Discontinuous Space Vector PWM (DSVPWM) schemes for 3-level 3-phase 6-switch split-wound Coupled Inductor Inverters (CII). A simplified approach is applied to the generation of interleaved DSVPWM schemes with the need to minimize high frequency current ripple and associated losses in the coupled inductor and the inverter. The performance of the CII is investigated and compared for DSVPWM schemes. The current ripple is analyzed based on the position of the discontinuous period for several DSVPWM schemes with different loads and power factors. Regardless of the loads, 60° discontinuous SVPWM around the positive and negative peaks of the fundamental reference voltage, DSVPWM1, lowers losses in the coupled inductor. The simulation and experimental results validate the drive performance.