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The active power of an alternator can be varied by

  • The active power of an alternator can be varied by Changing the prime mover speed.
  • In an alternator, the active power output is determined by the mechanical power input to the rotor, which is directly proportional to the product of the generator's magnetic field and the rotational speed of the rotor.
  • Therefore, by increasing or decreasing the speed of the prime mover, the mechanical power input to the rotor can be varied, which in turn will change the active power output of the alternator.
  • The speed of the prime mover can be controlled by various means, such as by using a governor system to control the flow of fuel or steam to the prime mover, or by using an electronic control system to adjust the frequency of the electrical output of the generator.
  • However, it is important to note that changing the speed of the prime mover can also affect the frequency and voltage of the electrical output of the generator, and may require adjustments to the excitation system to maintain the stability and reliability of the power system.