Common-Mode Current Elimination PWM Strategy Along With Current Ripple Reduction for Open-Winding Five-Phase Induction Motor Drive

Abstract

The three-level dual-inverter connected to five-phase open-end winding induction motor (FPOEWIM) drive with a single dc source results in the flow of common mode current (CMC). The CMC flows through the common dc bus connected to dual-inverter and the motor phase windings. The CMC can be eliminated by using the switching states that can generate zero common mode voltage (CMV). In case of FPOEWIM, these switching states may result in higher current ripple. This paper proposes a decoupled pulsewidth modulation (PWM) technique to reduce the motor phase current ripple by using nearest possible space vector locations (SVLs) with zero as well as non-zero CMV. The use of non-zero CMV states results in CMC. So, the CMC is averaged to zero using sample-averaged common-mode current elimination (SACE) PWM technique in conjunction with decoupled PWM, which is named as DSACE PWM technique. Furthermore, the application of the proposed PWM is also supported using simulation for the closed-loop control scheme, such as DTC. Also, the proposed decoupled and DSACE PWM techniques are verified experimentally and the results are compared with the conventional 144° decoupled PWM technique.