Digital Governor Application — Bradley Lake Projectby John Yale, Stone & Webster Engineer Corp, Englewood, United States,
Terry Bauman, Stone & Webster Engineer Corp, Englewood, United States,
Abstract: The Bradley Lake Project has two impulse turbines rated at 60 MW each to provide power to the Railbelt region of Alaska. Solid state digital governors are utilized to respond to system stability and operating requirements. The governors have a conventional hydraulic part coupled with a microprocessor based programmable digital part containing the governing algorithms. Three modes of control are implemented: turbine needle valve control based on power feedback for strong grid operation, droop control for weak grid operation, and a speed feedback deflector control to provide spinning reserve and isolated operation.
Subject Headings: Lakes | Hydraulics | Turbines | Control systems | Grid systems | Coupling | Rail transportation | Solid mechanics | North America | Alaska | United States
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