SPWM CONTROLLED EMBEDDED Z-SOURCE INVERTER FED THREE PHASE INDUCTION MOTOR DRIVE WITH REDUCED THD
This paper presents the simulation and hardware implementation of Sinusoidal pulse width modulated Embedded Z-Source inverter fed three phase induction motor drive. Voltage Source Inverter (VSI) and Current Source Inverter (CSI) are the two conventional converters used with induction motor drives in industrial applications. Conventional VSI and CSI can perform either buck or boost operation from DC-AC power conversion. The Z-Source inverter overcomes the problems associated with VSI or CSI. Z-Source Inverter employs a unique LC impedance network to match the inverter main circuit to DC voltage source. The conventional converters have eight switching states, six active states and two non shoot through zero states. One more switching state, shoot through zero state is possible with ZSI due to presence of LC impedance network. By controlling the shoot through duty cycle any desired DC output voltage can be obtained. Zero state voltage buck-boost capability. EZSI has been developed from ZSI concepts, with voltage source embedded within the impedance network, produces same voltage gain as that of ZSI and maintains smooth voltage or current across the impedance network. This can be achieved without any additional passive filter. The EZSI provides voltage ride-through capability, reduced harmonics and increased output voltage. This paper proposes sinusoidal pulse width modulated EZSI for three phase induction motor drive.
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