Pelton turbine deflector control designs for Bradley Lake hydro units

Author

Johnson, Randell M. ; Chow, Joe H. ; Hickey, Brian

Author_Institution

Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA

Volume

6

fYear

2002

fDate

2002

Firstpage

4855

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 and using a feedforward control to counter the transient over-frequency condition. An integral part of the design is a reference adjustment scheme for the load setpoint in disengaging the deflectors. Simulation studies show the improved performance of the proposed control design.

Keywords

feedback; feedforward; hydroelectric power stations; oscillations; power station control; stability; Alaska Railbelt power system; Bradley Lake hydro units; Kenai Peninsula; Pelton turbine deflector control designs; Pelton turbine hydro units; USA; deflector disengagement; feedback; feedforward control; load rejection operations; load setpoint; oscillatory instability; overspeed deflector control; power swing destabilization; reference adjustment scheme; transient overfrequency condition; Control systems; Frequency; Hydraulic turbines; Lakes; Power generation; Power system control; Power system interconnection; Power system simulation; Power system transients; Power systems;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 2002. Proceedings of the 2002

ISSN

0743-1619

Print_ISBN

0-7803-7298-0

Type

conf

DOI

10.1109/ACC.2002.1025427

Filename

1025427