An Improved Predictive Current Control Technique for Open-End Winding Interior Permanent Magnet Synchronous Motor Drive with reduced Ripples for EVs

Abstract

Permanent Magnet Synchronous motors (PMSM) are the special motors which are widely used in the applications of Electric Vehicles (EVs). Predictive current control (PCC) is the method which is popularly used for the control of PMSM. Generally, a two-level inverter is used to feed the PMSM in the mentioned process, but an Open -End Winding PMSM (OEWPMSM) fed from both the sides with two-level inverters will produce multi-level characteristics which gives lesser torque and flux ripples. In conventional PCC (C-PCC), the optimal voltage vector (OVV) is selected by calculating the error between reference value stator current and predicted value of stator currents. Here, the same OVV is selected for an entire control interval and hence there are more ripples. In the proposed PCC, a null vector is included with OVV which is for only certain time in control interval known as duty cycle. The proposed PCC has developed with improved cost function which includes flux weights and duty cycle calculations and gives the current error value more accurately to minimize the ripples in torque & flux. Simulation studies are performed for an OEW-PMSM fed with dual inverter with three level inversion for conventional and proposed PCC.