Improve of the direct torque control strategy applied to a multi-phase interior permanent magnet synchronous motor using a super twisting sliding mode algorithm

Abstract

Introduction. Conventional direct torque control (DTC) is a superior control strategy for managing the torque of a five-phase interior permanent magnet synchronous motor (FP-IPMSM). Nevertheless, the DTC’s switching frequency results in large flux and torque ripples, which produce acoustic noise and impair control performance. On the other hand, the DTC scheme’s performance when using conventional PI controllers results in high flux and torque ripples, which decreases the system’s robustness. Goal. This work aims to use a modern variable structure control of the DTC scheme based on a super twisting algorithm in order to ensure efficient control of multiphase machine, reduce flux and torque ripples, minimize tracking error, and increase robustness against possible disturbances. Scientific novelty. We propose to use super-twisting sliding mode control (STSMC) methods of the DTC based on the space vector modulation (SVM) algorithm of the multiphase motor. Methodology. In order to achieve a decoupled control with higher performance and to ensure stability while handling parameter changes and external disturbances, a STSMC algorithm on the DTC technique incorporating the SVM algorithm was implemented in place of the switch table and PI controller. Results. The suggested STSMC-DTC based SVM approach outperforms the conventional DTC methods in achieving the finest performance in controlling the FP-IPMSM drive. Practical value. The merits of the proposed DTC technique of FP-IPMSM are demonstrated through various tests. The suggested STSMC-DTC approach reduces flux and torque ripples by roughly 50 % and 60 %, respectively, in comparison to the conventional DTC strategy. Furthermore, the proposed technique of FP-IPMSM control method is made to provide robust performance even when machine parameters change. References 24, table 2, figures 8.