FIELD: power industry.
SUBSTANCE: invention relates to power industry. A method for obtaining frequency behaviour of a combined-cycle power plant containing a gas-turbine engine and a steam-turbine engine involves control of power output of the combined-cycle power plant, thus controlling an inlet steam control valve and/or controlling a steam flow through a bypass steam line in response to variation in frequency of electric mains. Power output of the gas turbine can also be changed so that the steam generated by a boiler will be enough to achieve the target output of the steam turbine.
EFFECT: invention allows improving reliable control of electrical mains frequency.
13 cl, 7 dwg
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