A new scheme of VVVF inverter using line voltage direct PWM

This paper presents a new design for general inverter using line voltage direct PWM technique. This new scheme is different from the conventional inverter basing on the SPWM technique. This new scheme doesn´t using high frequency signal injection method to improve the DC voltage utility of inverter, so the algorithm is very simple contrast to the SPWM technique. The system is very clear and suitable for realization. The DC-link voltage utilization ratio of inverter is the highest. This paper designs a hardware platform using DSP. The debug of the hardware system have been done. Satisfactory experiment results have been presented.