An optimal algorithm on zero order voltage of space vector PWM modulation for n-cell inverters

Zero order voltage of the multilevel inverter is a serious threat to the performance and the aging of the motor, so restraining zero order voltage to optimize the motor running state and its maintenance has practical value. In order to restrain zero order voltage, this paper analyzes the distribution rule of zero order voltage for n-cell inverters and proposes a optimal modulation algorithm. The proposed algorithm, without adding any hardware, makes zero order voltage change within the minimum range, while it can ensure the quality of output waveform. Finally, the simulation and experimental results prove that the theoretical analysis of the proposed algorithm on restraining zero order voltage is correct and feasible.