Salient pole Synchronous generators and induction generators are used in hydroelectric power plant to convert the mechanical energy output of the turbine to electrical energy. Normally in hydro plants synchronous generators are employed for generating electricity, however for small power plant generator applications (plants less than 5 MVA generation capacity) Induction generators are used because of their lower cost due to the absence of the exciter, voltage regulator, and synchronizer which should be associated with synchronous generators.
Salient pole Synchronous generators are used in hydoelectric plant because:
The majority of hydroelectric installations utilize salient pole synchronous generators. Salient pole machines are employed because the hydraulic turbine in the hydroelectric plants operates at low speeds compared to steam plants, therefore generators in hydro plant requires large number of field poles to produce the rated frequency. Rotor of synchronous generator requires salient poles is mechanically best suited for low-speed applications, compared to round rotor machines which are employed in horizontal axis high-speed applications in turbo-generators. Round rotor or non salient pole synchronous generators are used in Thermal power plant because of high speed turbine.
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