Why synchronous generators are used for generation of electricity?

Forums Common electrical queries Why synchronous generators are used for generation of electricity?

This topic contains 2 replies, has 3 voices, and was last updated by Profile photo of Dnyanesh Dnyanesh 2 months, 3 weeks ago.

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  • #1243 Reply

    raj
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    Why only synchronous generators are used for generating electricity? Why asynchronous or induction generators are not used?

    #1286 Reply
    Profile photo of AP
    AP
    Participant
    2 votes
    Points: 64
    Query Resolver

    Synchronous machines are those that satisfy a relation

    Ns = 120f/P

    Ns = Synchronous speed

    f= supply frequency

    P = Number of poles

    by this relation,

    the frequency, f = (Ns×P)/120

    that is why synchronous generators are used for generation of electrical energy.

    • This reply was modified 2 months, 3 weeks ago by Profile photo of AP AP.
    • This reply was modified 2 months, 3 weeks ago by Profile photo of AP AP.
    #1289 Reply
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    Profile photo of Dnyanesh
    Dnyanesh
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    9 votes
    Points: 286
    Query Resolver

    Synchronous Generators or Alternators helps in maintaining same synchronous speed of generators within system.

    As stated by AP above,

    f= Ns*P/120

    where,

    f= Frequency of the power

    Ns= Synchronous speed of the individual generator

    P=No. poles in the generator

    Now,

    1. No. of poles in the generators are constant i.e. we use 4 no. of poles in Indian generators.
    2. We, in India maintain 1500 RPM synchronous speed.

    which by solving the above equation gives,

    f= Ns*P/120

    =(1500*4)/120

    =50 Hz.

    So, the conclusion is by using Synchronous Generators we maintain synchronous speed and hence the Frequency of power in the system.

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