A method is provided for operating a power station (10) with turbine shafting (11) including a gas turbine (12) and a generator (18) that is driven directly by the gas turbine (12) and that generates alternating current with an operating frequency. The output of the generator is connected to an elec
A method is provided for operating a power station (10) with turbine shafting (11) including a gas turbine (12) and a generator (18) that is driven directly by the gas turbine (12) and that generates alternating current with an operating frequency. The output of the generator is connected to an electrical grid (21) with a given grid frequency. An electronic decoupling apparatus or variable electronic gearbox (27) is arranged between the generator (18) and the grid (21). The decoupling apparatus decouples the operating frequency from the grid frequency. In the event of a temporary over-frequency or under-frequency event in the electrical grid (21), the mechanical rotational speed of the gas turbine (12) is decreased more than the grid frequency during an under-frequency event of the electrical grid (21) and is increased more than the grid frequency during an over-frequency event of the electrical grid (21).
대표청구항▼
1. 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 operat
1. 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 (nmech) of the gas turbine in a controlled way, increasing the mechanical speed (nmech) 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 (nmech) 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. 2. The method according to claim 1, wherein in case of an under-frequency event in the electrical grid, the mechanical rotational speed (nmech) of the gas turbine is decreased to a greater or lesser degree than the grid frequency. 3. The method according to claim 1, wherein in the case of an over-frequency event in the electrical grid, the mechanical rotational speed (nmech) of the gas turbine is increased to a greater or lesser degree than the grid frequency (F). 4. The method according to claim 1, wherein a gas turbine is used with an output greater than 100 MW and, the electronic decoupling apparatus is a frequency converter in the form of a matrix converter. 5. The method according to claim 1, wherein the operating frequency clearly differs from the grid frequency or a second operating frequency. 6. The method according to claim 5, wherein the grid frequency or the operating frequency equals 50 Hz or 60 Hz. 7. The method according to claim 1, wherein a gas turbine with sequential combustion is used as the gas turbine. 8. Method for operating a power station having a turbine shafting comprising a gas turbine, having an output greater than 100 MW, and a generator 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, the decoupling apparatus is a frequency converter in the form of a matrix converter and decouples the operating frequency from the grid frequency (F), the method comprising: adjusting a mechanical rotational speed (nmech) of the gas turbine in a controlled way in the event of temporary over-frequency or under-frequency events in the electrical grid, wherein the matrix converter comprises a plurality of controllable, bidirectional switches that are arranged in an (m x n) matrix and, controlled by a controller, connect m inputs selectively to n outputs, where m is greater than n and where a first device for determining the polarity of the currents in the inputs are provided and a second device for determining the polarity of the voltages between the inputs are provided, and wherein the first and second devices are connected to the controller by signal lines. 9. The method according to claim 1, wherein the gas turbine decoupled from the grid frequency runs at an increased mechanical rotational speed, in order to be able to output, in the event of an under-frequency event, additional kinetic energy from the shaft as electrical power to the electrical grid. 10. The method according to claim 1, wherein the gas turbine decoupled from the grid frequency runs at a reduced mechanical rotational speed, in order to be able to absorb energy from the electrical grid in the event of an over-frequency event. 11. The method according to claim 1, wherein the rotational speed slope is controlled, in order to draw a given kinetic power from the shaft and to feed it as electrical power to the electrical grid . 12. The method according to claim 1, wherein a rotational speed of the shaft is controlled at a fixed ratio to changes in the grid frequency. 13. 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, the decoupling apparatus decouples the operating frequency from the grid frequency (F), the method comprising: adjusting a mechanical speed (nmech) of the gas turbine in a controlled way in the event of temporary over-frequency or under-frequency events in the electrical grid wherein in the event of frequency changes in the electrical grid, the mechanical rotational speed (nmech) of the gas turbine is changed up to a first limit with a first ratio to the change in the grid frequency (F), the speed is changed starting at the first limit up to a second limit with a second ratio to the change in the grid frequency (F), and the speed is kept constant starting at the second limit independent of the grid frequency (F). 14. The method according to claim 13, wherein at least one of the limits is a function of an aerodynamic rotational speed of the gas turbine. 15. The method according to claim 1, wherein the slope of the mechanical rotational speed change of the gas turbine is limited. 16. The method according to claim 1, wherein after an under-frequency or over-frequency event, the mechanical rotational speed (nmech) of the gas turbine is driven in a controlled way with a small rotational speed slope back to an optimum operating point. 17. The method according to claim 13, wherein advance control of at least one fuel control valve is performed as a function of the slope of the mechanical rotational speed change of the gas turbine. 18. The method according to claim 1, wherein, in the event of under-frequency or over-frequency events in the electrical grid, a closed-loop control system reacts only when the changes in frequency exceed a dead zone set around the grid frequency. 19. The method according to claim 1, wherein during under-frequency or over-frequency events in the electrical grid, a closed-loop control system reacts only when the changes in frequency relative to a sliding average of the grid frequency become greater than a given dead zone. 20. The method according to claim 1, wherein during under-frequency or over-frequency events in the electrical grid, the mechanical rotational speed (nmech) of the gas turbine is kept constant.
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이 특허에 인용된 특허 (14)
Kikkawa Yoshitsugi (Kanagawa-ken JPX) Yamamoto Osamu (Kanagawa-ken JPX) Naito Yasuhiro (Kanagawa-ken JPX) Sakaguchi Junichi (Kanagawa-ken JPX), Compressor drive system for a natural gas liquefaction plant having an electric motor generator to feed excess power to.
Nelson, Robert J.; Suchor, Mark Robert, Single speed turbine generator for different power system output frequencies in power generation systems and associated methods.
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