A Modified Series Z-Source Inverter Based on Switched Inductors with High Voltage Gain and Reduced Voltage Stress on Capacitors

In this paper, a series Z-source inverter based on switched inductors cell is proposed for the first time. This inverter is able to increase the voltage gain in comparison to the conventional Z–source inverters in additon to solve the ST (shoot-through) state’s problems. In this inverter, the value of voltage gain is increased by increasing the number of used diodes and inductors in the switched inductors cell. The low value of the capacitors voltage stress is the other advantage of the proposed inverter. The voltage of the capacitors is increased from zero to desired value by increasing the duty cycle of ST state from zero to its desired value. This leads to soft start in the proposed inverter that is impossible in the conventional Z-source inverters. In this paper, in addition to investigate the operating of the proposed inverter in different operating modes, the value of voltage stress of the capacitors, current inductors and the value of voltage gain are also calculated. Moreover, the proposed inverter is compaerd with the conventional Z-source inverters to investigate the advantages and disadvantages of it. Finally, the accuracy performance of the proposed inverter is verified thruogh simulation results in PSCAD/EMTDC software program.