Discontinuous Space Vector Pulse Width Modulation for Six Switch Converter With Independent Control of Phase Voltages and Switching Device Stress Alleviation

This paper presents a discontinuous space vector pulse width modulation (DSVPWM) for the six-switch inverter. To provide a broader alternative of DSVPWM for the six-switch inverter, the space vector method employing three zero vector partitioning parameters has been used to generate the modulation signals. A simple mathematical transformation is applied to the resulting modulation signals. This, along with the switching logic results in the accurate synthesis of the phase voltages in both the linear and non-linear regions of operation. The operating modes are chosen to ensure independent phase voltages. Furthermore, the use of the three zero vector partitioning parameters for the DSVPWM not only alleviate the switching stresses of the devices but ensures even distribution of the stress in the top, middle and bottom devices in a leg of the converter. An application of the converter is the symmetrical two-phase induction motor (STPIM) drive. Experimental results validate the theory and analysis including an open loop v/f operation of the STPIM drive.