Embeded control of Z-Source inverter

Traditionally Voltage Source Inverter (VSI) and Current Source Inverter (CSI)\ud fed induction motor drives have a limited output voltage range. Conventional\ud VSI and CSI support only current buck DC-AC power conversion and need a\ud relatively complex modulator. The limitations of VSI and CSI are overcome\ud by Z-source inverter.\ud The Z-source inverter system employs a unique LC network in the DC link\ud and a small capacitor on the AC side of the diode front end. By controlling the\ud shoot-through duty cycle, the Z-source can produce any desired output AC\ud voltage, even greater than the line voltage (i.e. 325V for 230V AC) regardless\ud of the input voltage. The proposed Z-source inverter system provides ridethrough\ud capability during voltage sags, reduces line harmonics, improves\ud power factor and reliability, and extends the output voltage range. Analysis,\ud simulation, and experimental results were presented to demonstrate these\ud features. This system reduces harmonics, electromagnetic interference noise\ud and it has low common mode noise. Index Terms: current source inverter\ud (CSI), voltage source inverter (VSI), Z-source inverter (ZSI), electro magnetic\ud interference (EMI