A method for the start of a power plant installation which includes a gas turbine, a generator coupled to the gas turbine, and a frequency converter to feed current into an electrical grid. In accordance with the method, during the start of the gas turbine, the generator is connected to the electric
A method for the start of a power plant installation which includes a gas turbine, a generator coupled to the gas turbine, and a frequency converter to feed current into an electrical grid. In accordance with the method, during the start of the gas turbine, the generator is connected to the electrical grid via the frequency converter before the operating rotational speed of the gas turbine is reached, wherein the frequency converter is controlled such that it generates an output current with the grid frequency. A power plant installation can execute the above method.
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1. A method for the start of a power plant installation comprising a gas turbine, a generator coupled to the gas turbine, and a frequency convertor, which is connectable to an electrical grid to feed current with a grid frequency, wherein during a start of the gas turbine, the frequency convertor is
1. A method for the start of a power plant installation comprising a gas turbine, a generator coupled to the gas turbine, and a frequency convertor, which is connectable to an electrical grid to feed current with a grid frequency, wherein during a start of the gas turbine, the frequency convertor is controlled before the nominal rotational speed of the gas turbine is reached, such that it generates an output current with the grid frequency and the generator is connected to the electrical grid via the frequency convertor, and before the nominal rotational speed of the gas turbine is reached, controlling acceleration of the gas turbine via power outputted to the electrical grid as soon as the generator outputs electrical power to the electrical grid via the frequency convertor. 2. The method for the start of a power plant installation as claimed in claim 1, wherein the generator is connected to the electrical grid via the frequency convertor at a rotational speed less than 90% of the operating rotational speed of the gas turbine. 3. The method for the start of a power plant installation as claimed in claim 1, wherein the generator is connected to the electrical grid via the frequency convertor as soon as the gas turbine has reached a rotational speed between 70% and 85% of the grid frequency. 4. The method for the start of a power plant installation as claimed in claim 1, wherein the generator is connected to the electrical grid via the frequency convertor as soon as discharge valves of the gas turbine are closed. 5. The method for the start of a power plant installation as claimed in claim 1, wherein the generator is operated as a motor to start rotation of the gas turbine until the self-sustaining rotational speed of the gas turbine is exceeded. 6. The method for the start of a power plant installation as claimed in claim 5, wherein the generator is initially operated as a motor to start rotation of the gas turbine via a start-up transformer and a static start-up device, the generator is separated from the static start-up device, and the generator is then connected via the frequency convertor for the output of electrical power to the grid. 7. The method for the start of a power plant installation as claimed in claim 5, wherein the generator is supplied with current from the grid via the frequency convertor and is operated as a motor to start rotation of the gas turbine until the gas turbine power exceeds the power necessary for acceleration of the shaft train, and, once the gas turbine power exceeds the power necessary for acceleration of the shaft train, electrical power is output to the grid via the frequency convertor. 8. The method for the start of a power plant installation as claimed in claim 5, wherein the generator is supplied with current from the grid via the frequency convertor and is operated as a motor for initial rotation of the gas turbine until the gas turbine power exceeds the power necessary for acceleration of the shaft train, and, as soon as the gas turbine power exceeds the power necessary for acceleration of the shaft train plus a threshold value, electrical power is output to the grid via the frequency convertor. 9. The method for the start of a power plant installation as claimed in claim 1, wherein the acceleration of the gas turbine is controlled by controlling the power output to the grid as soon as the generator outputs electrical power to the grid via the frequency convertor. 10. The method for the start of a power plant installation as claimed in claim 1, wherein the frequency convertor is controlled such that the generator, from the moment at which it is connected to the grid, outputs to the grid an electrical power greater than or equal to one percent of the nominal power of the gas turbine. 11. The method for the start of a power plant installation as claimed in claim 1, wherein the turbine outlet temperature is kept constant when the nominal rotational speed is reached, and the rotational speed of the gas turbine is controlled by increasing the output power to the nominal rotational speed of the gas turbine. 12. A power plant installation comprising: a gas turbine with a discharge valve for blowing out air from a compressor when starting up the gas turbine,a generator coupled to the gas turbine, anda frequency convertor, which is connectable to an electrical grid,wherein the frequency convertor comprises a controller, which, during the start of the power plant installation once the discharge valve has been closed and before the nominal rotational speed of the gas turbine is reached, controls the frequency convertor such that it generates an output current with the grid frequency in order to connect the generator to the electrical grid, and controls, before the nominal rotational speed of the gas turbine is reached, acceleration of the gas turbine via power outputted to the electrical grid as soon as the generator outputs electrical power to the electrical grid via the frequency convertor. 13. The power plant installation as claimed in claim 12, wherein a step-up transformer is arranged between the frequency convertor and the grid. 14. The power plant installation as claimed in claim 12, wherein a generator circuit breaker, a step-up transformer and a grid high-voltage transformer are arranged between the frequency convertor and the grid in order to output power to the grid, and a starting transformer and a start-up switch are arranged parallel to the generator circuit breaker for power consumption for the start of the gas turbine.
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이 특허에 인용된 특허 (5)
McCarty William L. (West Chester FL) Wescott Kermit R. (Winter Springs FL), Gas turbine control system having maximum instantaneous load-pickup limiter.
Birch Peter H. (Horsham GBX) Ikeyama Takeshi (Brighton GBX) Wearing Anthony D. (Brighton GBX) Norton Mark G. (Hove GBX), Gas turbine engine driven auxiliary electric power unit with turbine speed controlled in response to generator output cu.
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