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In a generator system having a gas turbine (1) and a generator (2), which is driven by the gas turbine (1), an electricity supply network (5) is supplied from an energy reservoir (6) when the output of the gas turbine (1) is inadequate in the case of a load change. In order to overcome the inertia o

In a generator system having a gas turbine (1) and a generator (2), which is driven by the gas turbine (1), an electricity supply network (5) is supplied from an energy reservoir (6) when the output of the gas turbine (1) is inadequate in the case of a load change. In order to overcome the inertia of the gas turbine (1), energy is additionally supplied from the energy reservoir (6) to the generator (2) which, acting as a motor, accelerates the gas turbine (1) until it at least has the output demanded by the network.

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1. A method of supply energy with a generator system, the generator system having an energy reservoir and a generator driven by a gas turbine, the method comprising: supplying energy to the energy reservoir by the gas turbine when an output of the gas turbine is sufficient for an energy demand of th

1. A method of supply energy with a generator system, the generator system having an energy reservoir and a generator driven by a gas turbine, the method comprising: supplying energy to the energy reservoir by the gas turbine when an output of the gas turbine is sufficient for an energy demand of the electricity supply network, andwhen a shortfall exists between the output of the gas turbine and the energy demand of the network, supplying the shortfall from the energy reservoir to the network and supplying energy from the energy reservoir energy to the generator to accelerate the gas turbine by operating the generator as a motor.2. The method as claimed in claim 1, comprising supplying energy to the network exclusively from the energy reservoir when the output of the gas turbine is inadequate to supply the network.3. The as claimed in claim 1, comprising accelerating the gas turbine to produce a higher output than necessary for supplying the network, and supplying surplus energy produced by the gas turbine to the energy reservoir.4. The method as claimed in claim 1, comprising increasing an amount of fuel supplied to the gas turbine to additionally accelerate the gas turbine.5. The method as claimed in claim 1, wherein the energy reservoir is a battery or a flywheel.6. A generator system comprising; a gas turbine,a generator driven by the gas turbine, a rectifier,an inverter for connecting the generator to an electricity supply network, andan energy reservoir configured to supply energy to the electricity supply network and to accelerate the turbine when an output of the gas turbine is inadequate, the energy reservoir supplying energy to the generator and the generator operating as a motor to accelerate the gas turbine when the output of the gas turbine is inadequate for the electricity supply network.7. The generator system as claimed in claim 6, wherein the energy reservoir is arranged between rectifier and inverter.8. The generator system as claimed in claim 6, wherein the gas turbine is directly connected to a rotor of the generator by means of a shaft.9. The generator system as claimed in claim 6, wherein the energy reservoir can be topped up by means of the generator.10. The generator system as claimed in claim 6, wherein the energy reservoir is a battery or a flywheel.11. The method as claimed in claim 1, comprising supplying energy from the energy reservoir to the generator and to the network when the output of the gas turbine is inadequate to supply the network.12. The generator system as claimed in claim 6, the energy reservoir being configured to supply energy from the energy reservoir to the generator and to the network during normal operation when the output of the gas turbine is inadequate to supply the network.