Current mode Z-source inverter-fed ASD system

The paper proposes a novel topology of Z-source inverter system and control for adjustable speed drives (ASD). The Z-source inverter employs a unique LC network to couple the inverter main circuit to the diode front end. By controlling the open-circuit duty cycle, the Z-source inverter can produce any desired output ac voltage, even less than the line voltage. As results, the new Z-source inverter system provides better low speed characteristics that the traditional current source inverter-fed ASD through the simple circuit structure and the unique control strategy. The simulation results testify the rationality of the topology.