A Simplified Space Vector Modulation Method for VIENNA Rectifier Considering Neutral-point Potential Balance

The traditional two-level and three-level converters have their own disadvantages when the energy does not need to flow bidirectionally. In this paper, the topological structure and working principle of the three-level three-switch VIENNA rectifier are deeply analyzed. In view of the fluctuation of dc-side neutral-point potential in VIENNA rectifier, dc bus capacitor voltage deviation is introduced into duty cycle allocation of SVPWM. The neutral-point potential balance is achieved by adjusting the action time of each vector. A simplified SVPWM modulation algorithm for three-level to two-level is studied. Finally, a simulation model is built in Matlab/Simulink. The simulation results verify the feasibility of simplified SVPWM modulation algorithm and neutral-point potential balance control strategy.