A new method for minimizing of voltage stress across devices in Z-source inverter

摘要

This paper presents a new method for minimizing of voltage stress across devices in Z-source inverter. Both the dc boost and the ac output voltage of the Z-source inverter have been controlled using neural network controllers. The capacitor voltage of Z-source network has been controlled linearly in order to improve the transient response of the dc boost control of the Z-source inverter. The peak value of the line to line ac output voltage is used to control and keep the ac output at its desired value. A modified space vector pulse-width-modulation method is also applied to control the shoot-through duty ratio for boosting dc voltage. This modified method lets the dc voltage stress across the inverter switches be minimized. The new method for minimizing of voltage stress is verified by simulation results.