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A voltage source inverter requires a dc link that behaves as

  • A.an open circuit between the rectifier and the inverter
  • B.a stiff voltage source, provided by a capacitor
  • C.a stiff current source, provided by a large inductor
  • D.a resistive source of controlled magnitude

Answer: B

The capacitor holds the link voltage steady while the inverter draws pulsating current from it, and the machine sees a defined voltage at each instant. A current source inverter uses a large inductor instead and behaves quite differently.

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