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Medium-voltage drives use multilevel topologies chiefly because

  • A.multilevel topologies use fewer switching devices
  • B.the control of a multilevel inverter is simpler
  • C.multilevel inverters need no dc link capacitor
  • D.available devices cannot block the full link voltage

Answer: D

A machine at six or eleven kilovolts needs blocking voltages beyond a single practical device, and series connection with static and dynamic voltage sharing is difficult. Multilevel topologies divide the voltage by construction.

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