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A 9-Switch 3-Level VSI-Based MPSC of PMSM Without Weighting Factors

This paper proposes utilizing a 9-switch 3-level voltage source inverter (VSI) in model predictive speed control (MPSC) of a permanent magnet synchronous motor (PMSM) without weighting factors. MPSC, through which PMSM speed is controlled directly, is an impressive method which enjoys a faster dynamic response compared to the other predictive approaches, such as model predictive current control (MPCC). However, switching frequency is lower in MPSC which, subsequently, leads to high steady-state torque and speed ripples. In this regard, utilizing the proposed VSI, which has fewer switches in its structure compared to other 3-level VSIs, provides more active voltage vectors compared to the conventional 2-level VSI, and will decreases the speed, torque and d-axis stator current ripples of PMSM. Besides, cost function of MPSC consists of different components with dissimilar natures and dimensions; thus, proper tuning of the weighting factors of its cost function can be problematic. With this in mind, in this paper, weighting factors are eliminated through rating the different components of the cost function relatively. Simulation results applied in MATLAB/Simulink environment validates the effectiveness of the proposed method.