Varying Generator Excitation to Control Draft Tube Surge

by K. Warren Frizell, Bureau of Reclamation, Denver, United States,
J. C. Agee, Bureau of Reclamation, Denver, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


The Bureau of Reclamation recently experimented with varying the excitation applied to a hydroelectric generator to control power swings caused by draft tube surging in a Francis turbine. Field testing was performed on a 48 MW unit at Blue Mesa Powerplant, near Gunnison, Colorado. A variety of signals were fed into the excitation system. Data acquired included: draft tube pressure, power output, vibration, and shaft runout. Results of the field test and additional analytical work are used to evaluate the concept.

Subject Headings: Electric power | Hydro power | Electrical equipment | Field tests | Bureau of Reclamation | Data collection | Excitation (physics) | Hydraulics | Colorado | United States

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