For the speed control of AC drive the preferred method using thyristor is:

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  1. phase control
  2. integral cycle control
  3. sinusoidal PWM control
  4. unipolar PWM control

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Option 3 : sinusoidal PWM control
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For the speed control of AC drive the preferred method using thyristor is sinusoidal PWM control.

Sinusoidal Pulse Width Modulation (SPWM):

  • In this method of modulation, several pulses per half cycle are used. The pulse width is the sinusoidal function of the angular position of the pulse in a cycle.
  • The width of each pulse is varied in proportion to the amplitude of the sine wave evaluated at the center of the same pulse.
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