Patent ID: 8796874

Claim:
Method for operating a power station having a turbine shafting, a gas turbine having a rotor and a generator having a rotor, the turbine shafting comprising the gas turbine rotor and the generator rotor that is driven directly by the gas turbine and that generates alternating current at an operating frequency, whose output is connected to an electrical grid with a given grid frequency (F), an electronic decoupling apparatus is arranged between the generator and the grid, wherein the generator is constantly connected to the grid during an over-frequency or an under-frequency event, the decoupling apparatus decouples the operating frequency from the grid frequency (F), the method comprising: adjusting a mechanical rotational speed (n mech ) of the gas turbine in a controlled way, increasing the mechanical speed (n mech ) in the event of temporary over-frequency events in the electrical grid thereby absorbing rotational energy from the shafting of the gas turbine for frequency support or decreasing the mechanical rotation speed (n mech ) in the event of temporary under-frequency events in the electrical grid thereby releasing rotational energy from the shafting of the gas turbine for frequency support.