Title :
Pelton turbine deflector overspeed control for a small power system
Author :
Johnson, R.M. ; Chow, Joe H. ; Dillon, M.V.
Author_Institution :
Rensselaer Polytech. Inst., Troy, NY, USA
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 over-frequency condition. Simulation studies show the improved performance of the proposed control design.
Keywords :
PI control; feedforward; gain control; hydraulic turbines; oscillations; power systems; transients; velocity control; Alaska railbelt power system; PI regulation; Pelton turbine deflector; adaptive feedforward control; deflector bias; deflector controller gains; feedback gain reduction; frequency domain analysis; load rejection operations; oscillatory instability; overspeed control; power swing destabilisation; swing modes; transient over-frequency condition; Adaptive control; Control systems; Counting circuits; Feedback; Frequency domain analysis; Hydraulic turbines; Power system analysis computing; Power system control; Power systems; Programmable control;
Conference_Titel :
Power Engineering Society General Meeting, 2003, IEEE
Print_ISBN :
0-7803-7989-6
DOI :
10.1109/PES.2003.1270952
