Optimization Method of Output Power Quality of Z-Source Inverter Based on SVPWM

A linear modulation of SVPWM control strategy employed in Z-source inverter is proposed in this paper. The DC bus voltage is regulated by adjusting the shoot through duty based on load. The reference voltage vectors are limited in the inscribed circle of hexagon of basic voltage vectors. Overmodulation is avoided. The linear relationship between the peak value of the output voltage and the DC bus voltage is kept in all regions. The change of system load is responded by this control strategy. The system control algorithm is simplified and the output capability of the system is enhanced. To validate its advantages, analytical, simulation, and experimental results are also presented.