Investigation of oscillatory problems of hydraulic generating units equipped with Francis turbines

Author

Konidaris, D.N. ; Tegopoulos, J.A.

Author_Institution

Public Power Corp., Greece

Volume

12

Issue

4

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

419

Lastpage

425

Abstract

In the paper a method is presented for the study of oscillatory problems of hydraulic generating units equipped with Francis turbines. The accurate equations of the turbine are implemented for the simulation, taking into account water hammer effect. Partial derivatives of turbine flow rate and torque with respect to head and gate opening are deduced from real measurements for the whole leading range. Speed governor dynamics are fully simulated, and the influence of torsional vibrations is studied. The vibration response of the unit to draft tube surges is investigated and the risk of excessive oscillations is evaluated. The approach was developed for diagnosis of excessive vibrations of Kastraki hydro power station in Greece

Keywords

angular velocity control; hydraulic turbines; hydroelectric power stations; oscillations; power station control; torsion; vibrations; Francis turbines; Greece; Kastraki hydro power station; draft tube surges; excessive oscillations risk; gate opening; head opening; hydraulic generating units; oscillatory problems; speed governor dynamics; torsional vibrations; turbine flow rate; turbine torque; vibration response; water hammer effect; Character generation; Elasticity; Frequency; Hydraulic turbines; Power generation; Surges; Transfer functions; Valves; Vibrations; Water;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.638969

Filename

638969