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 sin gle 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 elimi nated by using the switching states that can generate zero common modevoltage (CMV).IncaseofFPOEWIM,theseswitchingstates may result in higher current ripple. This paper proposes a decou pled pulsewidth modulation(PWM)techniquetoreducethemotor phase current ripple by using nearest possible space vector loca tions(SVLs)withzeroaswellasnon-zeroCMV.Theuseofnon-zero CMVstates results in CMC. So, the CMC is averaged to zero us ing sample-averaged common-mode current elimination (SACE) PWM technique in conjunction with decoupled PWM, which is named as DSACE PWMtechnique. Furthermore, the application of the proposed PWM is also supported using simulation for the closed-loop control scheme, such as DTC. Also, the proposed de coupled and DSACE PWMtechniques are verified experimentally andtheresults are comparedwiththeconventional144°decoupled PWMtechnique.