A fixed switching frequency model predictive control for t-type three-level three-phase grid-connected inverters

Abstract

Due to the spectrum of inverter output voltages and currents spreading over different frequencies for the traditional model predictive control, the fixed switching frequency model predictive control method is proposed and applied in T-type three-level three-phase grid-connected inverters. This proposed method combines the advantages of the traditional model predictive control and space vector pulse width modulation (SVPWM) method. According to the desired voltage vector and the cost function values of different voltage vectors, the action times and sequences of different voltage vectors are determined. At last, a T-type three-level three-phase inverter simulated platform rated at 10 kW is established. The simulated results show that the spectrum of inverter output voltages and currents for the proposed method is similar to SVPWM method, and it has good steady and dynamic performances.