RESEARCH ON Z-SOURCE INVERTER CONTROL BASED ON STATE SPACE MODEL

To solve the low energy efficiency and inverter dead zone of the electrochemical power supply, we propose a new control method that uses a Z -source inverter as the intermediate cascade. The two states of the state space model, shootthrough and non -shoot -through, are derived mathematically, and the steady-state equation and the transfer function of z -network capacitance -voltage are both obtained. The voltage boost control structure of the Z -source network is analyzed. The circuit transfer function is optimized by adjusting the gain and adding the series advance correction device. The result shows that amplitude -frequency and phasefrequency characteristics are improved. The simulation model of the Z -source inverter circuit is built. The simulation analysis shows that the closed -loop system has strong anti -interference ability, which can provide a stable and suitable voltage for the subsequent circuit. The control circuit of the Z -source inverter is designed, and the direct duty cycle D and M57962 driving circuits are tested in this paper. The results show that the duty cycle can be adjusted at 0-45% continuously, and the peak pulse of the driving circuit meets the requirements.