Deadbeat prediction direct power control of Vienna rectifier under unbalanced three-phase Voltage

Abstract

There are many control strategies for Vienna rectifiers, but most of them are carried out when the power grid is balanced. In the case of unbalanced power grids, this paper proposes a deadbeat predictive direct power control to reduce the ripple problem of negative sequence current and active power. The strategy meets the minimum power tracking error as the control target to calculate the desired AC side voltage vector, and introduces space vector pulse width modulation to form a closed loop control system. Under unbalanced grid conditions, this strategy can also effectively extract the positive and negative sequence components of the grid voltage and current to form power compensation to suppress the negative sequence components of the current, thereby reducing the current harmonic content. And carry the Vienna rectifier simulation on MATLAB/Simulink for verification.