Voltage Vector Classification-Based Duty Cycle-Modulated PCC for OEW-PMSM Drive with Three-Level Inversion

The permanent magnet synchronous motor (PMSM) is extensively used in electric vehicles. The predictive current control (PCC) technique is most popularly employed in the control of open-end winding interior PMSM (OEW-IPMSM) drives. It is the simplest method with less complexity and is more easily understandable than other predictive control techniques. PCC involves optimization and evaluation of the cost function to reduce the errors in stator currents. The dual inverter-fed OEW-IPMSM drive using conventional PCC with 19 voltage vectors (VVs) performs poorly as one Active VV is applied for the complete control interval which yields in over-regulation with high switching frequency. In proposed PCC (P-PCC), initially voltage vectors were segregated into two groups based on machine operating speed and these vectors are applied for the evaluation of cost function which reduces the computational burden as well as switching frequency of the inverter. The obtained voltage vector (from CF minimization) and a null vector are used in one control cycle to minimize the q -axis stator current ripples and common mode voltage. In P-PCC, the cost function is modified which utilizes flux weights which reduces flux ripples for better performance. The efficacy of P-PCC is verified through MATLAB simulation results and validated using experimentation with a 3.7 kW OEW-IPMSM drive with d-SPACE controller.