22 May 2017

Compare Current Source Inverter ( CSI ) and Voltage Source Inverter ( VSI )

There are following difference between current source inverter and voltage source inverter.
  • The input voltage in the voltage source inverter is constant whereas the input current may constant or variable. The input current in the current source inverter is constant.
  • The input supply source may be short circuited due to misfiring of the switching semiconductor device in the VSI whereas there is not any difficult due misfiring of semiconductor switches to input supply current constant in the CSI.
  • The maximum current passes through semiconductor device in the VSI depend upon circuit condition whereas the input current in the CSI is constant therefore the maximum current passes through semiconductor device is limited.
  • The commutation circuit of the SCR in the CSI is simple than that of VSI.
  • There is no necessary of freewheeling diode in the CSI for reactive power or regenerative load whereas a freewheeling diode is used in the VSI for reactive power or regenerative load.
  • The large inductor is connected at the input side in order to keep constant current at the input side of the CSI.
  • There is necessary of controlled converter in order to input voltage control in the VSI similarly a converter is necessary to control input current in the CSI. 


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