A Reduced Voltage Vector Strategy-Based PTC of OEW-PMSM Drives

Predictive torque control is emerging as a potent control scheme to achieve high dynamic performance of PMSM drives. Weighting factors (WFs) are needed to optimize cost function (CF) since it consist of numerous control objectives of varying magnitude. This article attempts to develop a new way of eliminating WFs for the predictive torque control (PTC) method of a dual inverter-fed open-end winding permanent magnet synchronous motor drive. The conventional PTC (C-PTC) experiences high torque and flux ripples and imposes a high computational burden on the processor. In the proposed PTC (P-PTC), torque cost function (TCF) and flux cost function (FCF) are considered separately. The TCF is calculated for 19 voltage vectors (VVs), and one VV is selected, which minimizes TCF. In the
$\alpha$
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$\beta$
space, four adjacent VVs with one null vector are chosen, and FCF is evaluated for only four VVs with one zero vector. The optimal VV is determined by minimizing FCF, and the inverter is provided with gate pulses to eliminate WF. Compared to C-PTC, P-PTC produces less torque, flux ripples, and a lower switching frequency. Both simulation and experimental results are presented in steady state and dynamic operations to validate the proposed method.