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A method for controlling a power plant which delivers electrical power to an electrical grid. The grid has a grid frequency which fluctuates around a nominal frequency. A power output of the power plant is controlled as a function of a control frequency, in such a manner that the power output is inc

A method for controlling a power plant which delivers electrical power to an electrical grid. The grid has a grid frequency which fluctuates around a nominal frequency. A power output of the power plant is controlled as a function of a control frequency, in such a manner that the power output is increased when the control frequency decreases below the nominal frequency. On the other hand the power output is decreased when the control frequency rises above the nominal frequency. The grid frequency is continuously measured. The measured grid frequency is averaged to give, as a moving average, a slowly varying averaged trend frequency which is characteristic of the long term behavior of the grid frequency. The averaged grid frequency is used as the control frequency, if the measured grid frequency lies within a predetermined band around the averaged grid frequency. The measured grid frequency is used as the control frequency, if the measured grid frequency lies outside the predetermined band.

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[ We claim:] [1.] Method for controlling a power plant which delivers electrical power to an electrical grid, wherein the grid is an AC grid having a grid frequency which fluctuates around a nominal frequency (f.sub.o), comprising the steps of:controlling a power output of the power plant as a funct

[ We claim:] [1.] Method for controlling a power plant which delivers electrical power to an electrical grid, wherein the grid is an AC grid having a grid frequency which fluctuates around a nominal frequency (f.sub.o), comprising the steps of:controlling a power output of the power plant as a function of a control frequency by a) increasing the power output when the control frequency decreases below the nominal frequency (f.sub.o), and b) decreasing the power output when the control frequency increases above the nominal frequency (f.sub.o);continuously measuring the grid frequency to obtain a measured grid frequency (f.sub.m);averaging the measured grid frequency (f.sub.m) to give as a moving average a slowly varying averaged grid frequency which is characteristic of the long term behavior of the grid frequency;providing a dead band around the averaged grid frequency;using the averaged grid frequency as the control frequency when the measured grid frequency lies within the dead band; andusing the measured grid frequency as the control frequency when the measured grid frequency lies outside the dead band.