Title :
Pelton turbine deflector overspeed control for a small power system
Author :
Johnson, Randell M. ; Chow, Joe H. ; Dillon, Michael V.
Author_Institution :
Rensselaer Polytech. Inst., Troy, NY, USA
fDate :
5/1/2004 12:00:00 AM
Abstract :
The overspeed deflector control of two Pelton turbine hydro units in the Alaska Railbelt power system has caused many incidents of oscillatory instability. Among the causes is the high controller gains applied to the deflectors, which are essential for load rejection operations but destabilize the power swings. In this paper, the overspeed control is achieved by reducing the feedback gains derived from frequency-domain analysis and using an adaptive feedforward control to counter the transient overfrequency condition. Simulation studies show the improved performance of the proposed control design.
Keywords :
adaptive control; control system synthesis; feedback; feedforward; frequency-domain analysis; hydraulic turbines; power generation control; velocity control; Alaska Railbelt power system; PI regulation; Pelton turbine hydro units; adaptive feedforward control; controller gains; feedback gains reduction; frequency-domain analysis; load rejection operation; oscillatory instability; overspeed deflector control; transient overfrequency condition; Adaptive control; Control systems; Counting circuits; Feedback; Frequency domain analysis; Hydraulic turbines; Power system analysis computing; Power system control; Power systems; Programmable control;
Journal_Title :
Power Systems, IEEE Transactions on
DOI :
10.1109/TPWRS.2004.825918
