Comparison of Dead-Time Compensation Based on Model Predictive Current Control Schemes for Nine-Phase Open-End Winding Motors

To suppress the dead-time effect of multiphase open-end winding (OW) motor drive systems, two compensation strategies based on model predictive control are applied and compared in this paper. Firstly, the multi harmonic space of the multiphase OW drive system is analyzed. Taking a nine-phase OW motor as an example, the dead-time results in significant third harmonic currents. Secondly, based on conventional model predictive current control (MPCC), two dead-time compensation methods have been proposed, namely additional vector method and harmonic space closed-loop control method. Finally, the experimental results prove that harmonic space closed-loop control by three harmonic virtual voltage vectors presented better compensation performance.