Abstract
Space vector pulse width modulation (SVPWM) strategy has obvious advantages in the output harmonic characteristics and dc voltage utilization of converters, and is widely used in converters below seven levels. However, with the increase of the number of levels, the space vectors and sector triangles increase dramatically, which complicates the reference vector’s location and makes the calculation of the switching state corresponding to the space vector difficult. To solve this problem, an SVPWM for cascaded three-phase bridge converter (C3PBC) is proposed in this paper. The proposed SVPWM strategy simplifies the reference vector’s location, and without calculating redundant switching states in the modulation process. The switching state’s duty cycle is calculated quickly. The modulation strategy can easily be applied to C3PBC with more levels without increasing the computational burden. Finally, the proposed SVPWM strategy is verified by MATLAB/Simulink.