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Third harmonic injection into a PWM reference

  • A.reduces the fundamental output the inverter can produce
  • B.raises the usable fundamental without over-modulating
  • C.increases the harmonic distortion at the machine terminals
  • D.produces a third harmonic current in the machine windings

Answer: B

Adding a common mode third harmonic flattens the reference peaks so a larger fundamental fits under the carrier. It cannot drive current in a star-connected machine with an isolated neutral, so the machine never sees it.

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