Three-level SVPWM method based on two-level PWM cell in DSP

This paper focuses on the relationship of three-level and two-level pulse width modulation (PWM) methods. A scheme of three-level space-vector PWM (SVPWM) based on one chip DSP is proposed depends on two groups of three-phase traditional PWM cell integrated in DSP. Neutral-point balance is achieved by adjusting the output voltage vectors based on the neutral-point current judging. This method simplified the digital control of three-level inverters, and improved the reliability of system. 660 V three-level converter with full digital control is proposed to verify the scheme.