A Comparison of Model Predictive and Dead-Beat Predictive Control Algorithms for Permanent Magnet Synchronous Motor

A discretized rotor reference frame dq-model of the PMSM is the basis of Model Predictive Control (MPC) and Deadbeat Predictive Control (DBC). A modified self-tuning field orientation control (FOC) of PMSM was developed for comparison with the predictive control methods. Since torque is proportional to q-axis current and control of current results in control of torque, speed, and rotor position, the MPC, DBC, and FOC algorithms ensure that the actual motor dq-currents track their respective references. The models were implemented in MA TLAB/Simulink. The results show effective tracking of current and speed references with minimal transients. The MPC showed the fastest speed settling time of 0.025 seconds (87.5% faster) and about 16% overshoot while the DBC has a settling time of 0.12 seconds (40% faster) with no overshoot. The FOC has its settling time as 0.2 seconds with no overshoot. Compared to FOC, both developed models have improved performance.