Unstable frequency oscillations in a slow-response reheat-turbine generator

Author

Vournas, C.D.

Author_Institution

Electr. Energy Syst. Lab., Nat. Tech. Univ. of Athens, Greece

Volume

1

fYear

1999

fDate

31 Jan-4 Feb 1999

Firstpage

140

Abstract

This paper shows that governor rate limits may result in slow response that interacts with that of a reheat turbine to create unstable frequency oscillations. The origin of these oscillations is explained with a linear analogue, while nonlinear simulation shows that the oscillations evolve into a limit cycle due to gate limits. A control scheme to stabilize the frequency oscillations through control of the intercept valve is developed and tested in the paper

Keywords

frequency stability; oscillations; steam power stations; steam turbines; valves; boilers; frequency oscillations stabilisation; gate limits; governor rate limits; governors; intercept valve; limit cycle; linear analogue; long term dynamics; nonlinear simulation; reheat turbine; slow response; slow-response reheat-turbine generator; steam power plant; steam turbines; unstable frequency oscillations; Boilers; Frequency control; Power generation; Power system dynamics; Power system modeling; Power system stability; Power system transients; Stability analysis; Turbines; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering Society 1999 Winter Meeting, IEEE

Conference_Location

New York, NY

Print_ISBN

0-7803-4893-1

Type

conf

DOI

10.1109/PESW.1999.747439

Filename

747439