Performanceanalysis of open end winding induction motor drive using center spaced PWM and bus clamping PWM techniques

In this paper, space vector based decoupled bus clamping PWM techniques are proposed for open-end winding induction motor drive fed with conventional two level inverters on either side. The switching vectors for the conventional inverters are generated using instantaneous reference voltages along with the simple digital logic. All the proposed bus-clamped PWM techniques are generated by phase shifting the one inverter reference phase voltages by 180 degrees with respect to the other inverter. A common-mode voltage is identified in the open-end winding induction motor drive. All the space vector based decoupled bus-clamping PWM techniques proposed in this work are to reduce the common mode voltage by greater extent and also give less switching loss compared to center spaced space vector PWM technique. To validate the proposed work, several simulation studies has been carried out in MATLAB/SIMULINK and the corresponding results are presented and compared.