VSI vs CSI · When the DC voltage remains constant, then it is called Voltage Source Inverter(VSI ) or Voltage Fed Inverter (VFI). · When input current is maintained constant, then it is called Current Source Inverter (CSI) or Current Fed Inverter (CFI). · Some times, the DC input voltage to the inverter is controlled to adjust the output. Such inverters are called Variable DC Link Inverter s . The inverters can have single phase or three-phase output. § A voltage source inverter(VSI) is fed by a stiff DC voltage, whereas a current source inverter is fed by a stiff current source. § A voltage source can be converted to a current source by connecting a series inductance and then varying the voltage to obtain the desired current. § A VSI can also be operated in curr...
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