Many of us know that, in electrical power generation the frequency must be kept constant for satisfactory operation of power system. But, the question is, why the frequency is to made constant? Before this, let us first understand the basic operation of the alternator. Operation of alternator: An alternator (synchronous generator) is a machine which converts mechanical energy into electrical energy at a particular voltage but at a constant frequency. The rotor part consist of field winding and stator part consist of armature winding. The field winding is excited with D.C supply. The turbine is mechanically coupled with the rotor to give the mechanical power input to the alternator. Now, when rotor rotates the flux due to field winding cuts armature conductors and according to the faraday's law of electromagnetic induction, an emf is induced in the armature conductors. The frequency of induced emf is given by: So, to generate constant frequency, the machine must always be driven at...
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