Sliding Mode Control with Multilevel Inverter for PMSM Motor

This paper introduces a permanent magnet synchronous motor (PMSM) with a sliding mode control (SMC)-based wavelet transform (WT). The PMSM motor is vulnerable to variations in the motor parameters and external disturbances, which may deteriorate steady-state performance. The proposed control system was tested using a 3-φ PMSM motor with 5 kW, 1000RPM, and a 3-φ multilevel inverter. The results showed that the motor can reach the estimated speed with good tracking to the value set at a frequency varying from [400, 1000, and 200] RPM. The system uses the Daubechies wavelets (db) for feature extraction due to their localization in both the time and frequency domains. A multilevel inverter with the space vector pulse width modulation (SVPWM) modulation algorithm was used to decrease the total harmonic distortion (THD) of the system to less than 2.5%, with WT residuals almost zero, with 100% decomposition and reconstruction. MATLAB 2020a was used for mathematical modeling and simulation of the proposed algorithm. The simulation results ensured smooth operation in all regions for the PMSM motor's speed and torque.