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

Volume

19

Issue

2

fYear

2004

fDate

5/1/2004 12:00:00 AM

Firstpage

1032

Lastpage

1037

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;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/TPWRS.2004.825918

Filename

1295014