Method for the short-term adjustment of the output of a combined-cycle power plant steam turbine, for primary frequency control

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United States of America Patent

PATENT NO 11255224
APP PUB NO 20190271239A1
SERIAL NO

16319897

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Abstract

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A method for the short-term adjustment of the output of a steam turbine of a combined-cycle power plant, includes: opening, respectively closing, a backed-up turbine valve of a pressure stage, according to a required change in output; comparing a desired pressure with a pressure measurement upstream of the turbine valve to measure pressure of steam mass flow flowing into the pressure stage; and opening, respectively closing, a feed line for introducing a variable proportion of water into the steam mass flow as soon as the pressure falls below or exceeds the desired pressure; the variable proportion of water is introduced into the steam mass flow until an adjusted desired steam temperature is reached, which is determined from the difference between a basic specified desired steam temperature and the default value of a controller which operates at least proportionally and evaluates the difference between the pressure measurement and the desired pressure.

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Patent Owner(s)

  • SIEMENS ENERGY GLOBAL GMBH & CO. KG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Preitl, Zsuzsa Erlangen, DE 2 10
Thomas, Frank Erlangen, DE 48 396
Weissenberger, Bernd Erlangen, DE 2 0

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