Proportional Resonance Control of Three-phase VIENNA Rectifier under Unbalanced Grids

When the power grid voltage is not balanced, a large number of third harmonic current will be generated by using the original control strategy, and the stability of the VIENNA rectifier will be seriously affected. A method of analyzing the instantaneous power of VIENNA rectifier in αβ coordinate system is used to analyze the calculation method of the reference current under the power control strategy at the grid side, and the controller of VIENNA current based on proportional resonance sliding mode control algorithm is designed. Finally, the feasibility of the control strategy is verified by MATLAB/Simulink simulation.