Dynamic control set-model predictive control for field-oriented control of VSI-PMSM

In this digest, a novel Model Predictive Control scheme is proposed for 2L-VSI PMSM drive system. Even though standard FCS-MPC can lead to low switching frequency, but it degrades the steady state performance, while MPC with duty cycle reduces the current and torque ripples at expense of high switching frequency. To mollify the contradiction between the steady-state performance and the switching frequency, the proposed approach can move the switching instant from sampling instant to any instant within a sampling interval. But variable switching instant also introduces infinite candidate control actions, which can compose a dynamic control set. To capture the optimal control action, variable switching instant is transformed as vectoral form, and the convey quadratic relationship between objective function and variable switching instant is derived. Based on it, an online optimization procedure is established. Finally, the test results show that the proposed approach can reach a balance between steady-state performance and switching frequency.