Eliminating Common-mode Voltage of Cascaded High Voltage Inverter Based on Support Vector Machine

To eliminate common-mode voltage of cascaded multi-level inverter,a concept of left and right legs is proposed according to the special structure of the converter.Each leg adopts 2-level support vector machine(SVM),and the phase difference between their reference vectors is set 2π/3.As every cascade of cascaded inverter can output 3-level voltages,3-level vectors with zero common-mode voltage are used for modulation.These two SVMs can be smoothly used in cascaded high-voltage inverter via staggered sampling time to completely eliminate common-mode voltage.The results of simulation and experiment verify the effectiveness of the proposed SVMs.