Finite set model predictive control method for quasi‐Z source inverter‐permanent magnet synchronous motor drive system

Abstract

In this study, a finite set model predictive control method is proposed for the quasi-Z source inverter-permanent magnet synchronous motor drive system. In the proposed method, the control variables of quasi-Z source network and motor are controlled uniformly, which can avoid the conflicts between the shoot-through duty cycle and the inverter modulation coefficient during the dynamic adjustment process in traditional two-stage control method. Due to the particularity of the motor connected to the quasi-Z source inverter, a power compensation control method is used to obtain the inductor current reference value. Whether the shoot-through vector is chosen as the optimal vector is determined by the inductor current, and the influence of undershoot phenomenon of capacitor voltage, which results from the non-minimum phase characteristics of quasi-Z source inverter, is avoided. Steady-state, dynamic, and input voltage dip experiments are performed on a quasi-Z source inverter-permanent magnet synchronous motor drive system. The experimental results verify the feasibility of the proposed predictive control method. Besides, compared with traditional two-stage control method, the proposed method has quicker response speed and stronger anti-disturbance ability.