Improved Optimal Duty Model Predictive Current Control Strategy for PMSM

Abstract

To further improve the steady-state performance of the conventional dual vector model predictive current control (MPCC), an improved optimal duty MPCC strategy for permanent magnet synchronous motor (PMSM) is proposed. This strategy is realized by selecting an optimal voltage vector combination and its duration from the five basic voltage vector combinations, followed by acting on the inverter. The five combinations are: the combination of the optimal voltage vector at the previous moment and basic voltage vector with an angle difference of 60°; the combination of the optimal voltage vector at the previous moment and basic voltage vector with an angle difference of 60°; the combination of the aforementioned three basic voltage vectors with the zero vector. Experimental results indicate that the method effectively reduces the stator current ripple without increasing the calculational burden. Furthermore, it improves the steady-state performance of the system without altering the dynamic performance of the system.