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Space vector modulation differs from carrier-based sinusoidal PWM in that it

  • A.produces a lower fundamental output than sinusoidal PWM
  • B.cannot be implemented in a digital controller
  • C.selects switching states from the desired output vector
  • D.requires no switching of the inverter devices at all

Answer: C

Treating the three phases together rather than separately gives about fifteen per cent more fundamental voltage and slightly lower distortion for the same switching. It maps naturally onto a digital implementation, which is why it is now the default.

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