Novel space vector PWM control technique for multilevel inverters

Based on the conventional space vector PWM technique for two-level inverters, a novel space vector PWM implementation technique for multilevel inverters is proposed. The cascaded inverters of each phase are divided into two parts: modulation inverters and fundamental inverters, and the reference voltages and the reference vector are also decomposed. Only the modulation inverters can be modulated in the PWM cycle, while the fundamental inverters output the fixed level. Simulation results show that lower THD of output voltage can be reached using the technique and the technique is suitable for the control of cascaded multilevel inverters.