Weighting-Factorless Predictive Torque Control Scheme for Dual Inverter fed Open-End-Winding PMSM With Single DC Source

摘要

The conventional predictive torque control (PTC) of open-end-winding permanent magnet synchronous motor drive with single dc source deals with the problems of complex weighting factor tuning, higher ripples in zero sequence current (ZSC) and increased flux and torque ripples. To mitigate the above drawbacks, an effective weighting-factorless PTC scheme is proposed. Initially, the ZSC objective of cost function is evaluated with three types of zero sequence voltages (ZSV) of the system that are available. The magnitude of ZSV corresponding to the minimized ZSC error is selected. Six or seven candidate voltage vectors are arranged in accordance with optimized ZSV. As the ZSC imposes high impact on torque and current performance, the selected candidate voltage vectors can be used to meet the torque and flux objective. To further eliminate the flux weighting-factor, an improved incremental merit-based scheme is proposed in this article. The weighting-factors tuning is avoided in the proposed PTC method which results in reduced ZSC and improved current performance in addition to the reduced ripples in flux and torque as well as lower computational burden. The effectiveness of the proposed PTC method is experimentally verified and compared with the existing PTC methods.