Direct Power Control in BLDC Motor Drives Using Finite Control Set Model Predictive Control to Reduce Torque Ripple and Speed Fluctuation and Improve Harmonic Distortions

Brushless dc motors (BLDC) are widely used in industrial applications due to their simple structure, high efficiency and long lifetime. The drive of these motors also has a fast transient response and has high quality waveforms in steady state. In this paper, the direct power control using the model predictive method with finite control set (DP-FCS-MPC) is presented in BLDC motor drive and compared with the conventional current control method based on FCS-MPC. This comparison is made under the same operating conditions and includes the steady state operation of the BLDC motor. The simulations performed in PLECS software show the performance of both methods in BLDC motor speed control under sudden load changes. Nevertheless, it is shown that the direct power control using model predictive method with finite control set has better performance in terms of torque ripple reduction, less speed and torque fluctuations, less active and reactive power ripple, and current waveforms with less harmonic distortions.