Three-Vector Model Predictive Direct Power Control of Vienna Rectifier based on Voltage Vector Optimization

When the traditional model predictive direct power control strategy is adopted in Vienna rectifier, there are some problems such as high harmonic content of grid-side current, single output voltage vector and large power pulsation. In this paper, a three-vector model predictive direct power control strategy for Vienna rectifier based on voltage vector optimization is proposed. the strategy has two effective voltage vectors and one zero vector in each sampling period, expands the coverage of alternative voltage vectors when selecting the second effective voltage vector, optimizes all optional voltage vectors, and carries out deadbeat control of active power and reactive power. In addition, the method proposed in this paper uses redundant switching state to solve the problem of midpoint potential fluctuation of Vienna rectifier. The simulation results show that, compared with the traditional model predictive direct power control, the proposed method has low harmonic content of grid-side current, can effectively reduce power pulsation and improve steady-state performance.