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Synchronous generator Vs. Induction generator

A generator is an electrical machine that converts mechanical energy into electrical energy. 

Generators are generally classified as below:

Synchronous generator Vs. Induction generator

Synchronous generator Vs. Induction generator

The difference between Synchronous generator and Induction generator is as mentioned below:

1) Synchronous generator

  • The field is excited by an external D.C excitation and the rotor is connected to prime mover.
  • The synchronous generator always operates at synchronous speed (Ns).
  • Since, the field is excited by an external D.C source, the synchronous generator can deliver both the real/true and reactive power.
  • Real power is being supplied by prime mover input and reactive power is supplied by external D.C excitation connected to the field. 
  • Hence, both real and reactive supplied can be controlled.
  • Since, the reactive power can be fully controlled, the synchronous generator can be operated at all range of power factors (Lagging, Leading, Unity power factor).
  • Efficiency is good.
  • Suitable for conventional power station i.e thermal, nuclear, gas, hydro and diesel power stations.
  • Most of the power generation (nearly 80%) is by conventional power stations employing synchronous generator.

2) Asynchronous generator

  • Since induction generator is connected to the power system, the field is excited by the reactive power taken from the grid and the rotor is connected to prime mover.
  • The induction generator always rotates at more than synchronous speed (Nr>Ns).
  • Since, the field is excited by the power system, the synchronous generator can deliver only real/true power but absorbs the reactive power.
  • Real power is being supplied by prime mover input and reactive power is absorbed from the system. 
  • Since, the prime mover, in case of induction generator operates at variable speed. Hence, both real and reactive power cannot be controlled.
  • Since, the reactive power is being absorbed from power system, the induction generator operates only at leading power factor.
  • Efficiency is poor.
  • Suitable for windmills, tidal power stations etc.
  • Altogether, very less power is generated using induction generator.


I hope you have got some good and relevant information from this blog. 
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