Switching frequency control method based on short prediction horizon control algorithm of Quasi-Z source inverter

Abstract

In order to overcome the problem of large inductance current ripple and poor output current quality caused by lower switching frequency in model predictive control (MPC). A short prediction horizon control algorithm is proposed, and the relationship between the prediction horizon and the switching frequency is analyzed, which also considered the influence of the switching frequency of the inverter. In the proposed algorithm the optimal vector is selected based on the historical switching state. Finally the proposed method can effectively reduce the inductor current ripple and improve the output current quality of the inverter, which is proved by simulation and experiment.