A method for providing control power for a power grid

A method for providing control power for a power grid, wherein the height of the provided control power in response to a deviation of the actual AC frequency is determined from a desired alternating current frequency of the power system, wherein the provision of the control power to increase the efficiency carried pulsed, wherein the determined in a corresponds to the period of the pulsed operation provided control energy to be provided in the same period, control energy in a continuous operation of a control power source.