A New Adjustable-Speed Drives (ASD) System Based on High-Performance Z-Source Inverter

This paper presents a new adjustable-speed drives (ASD) system which based on the high-performance Z-source inverter (named high-performance Z-source inverter ASD system). It can overcome limitations of original Z-source inverter ASD system. The proposed Z-source inverter ASD system can operate at wide range load (even no-load) with small inductor which is very suitable for ASD system, eliminate the possibility of the DC-link voltage aberrances, simplify the Z-source network inductor and controller design, increase the inverter modulation index M, thus, decrease the ripple current by changing the magnitude and distribution of the harmonics and then decrease the iron loss of the motor. The operation modes, voltage relationship of the proposed Z-source inverter ASD system, and a partly PAM/PWM control strategy, which consists with the V/f law, have been described in detail. Finally, simulation and experimental results verified the validity of the proposed high-performance Z-source inverter ASD system.