• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for operating a phase shifter synchronous generator. The method may include the steps of: accelerating a gas turbine (10) to no-load maximum speed conditions, connecting a generator (50) coupled to the gas turbine (10) to an electrical power grid, shutting off a flow of fuel to the gas turbine (10); Generator (50) in a phase shifter synchronous generator mode and generating reactive power for picking up reactive power from the electric power grid. The invention further relates to a gas turbine and a phase shifter synchronous generator system (100).
    公开号:CH709988A2
    申请号:CH01069/15
    申请日:2015-07-21
    公开日:2016-02-15
    发明作者:Scott Arthur Day
    申请人:Gen Electric；
    IPC主号:
    专利说明:

    Technical area
    The present application and the resulting patent relate generally to gas turbines and more particularly to phase shifter synchronous generators connected to a gas turbine to provide the stability of an electrical supply network without additional mechanical and / or electrical components.
    Background of the invention
    Phase shifter synchronous generators are used in a wide variety of applications, such as power generation. Phase-shifter synchronous generators are typically used to adjust the operating conditions to an electrical power distribution network. A phase shifter synchronous generator is a specialized motor with a disconnected shaft that freely rotates. The phase shifter synchronous generator may generate or pick up reactive power as required to assist the voltage and / or maintain the power factor of the electrical power grid.
    Similarly, synchronous generators driven by turbines or other types of power sources are commonly used by means to generate electrical energy. After years of use, a power generation facility may release or shut down a synchronous generator from use as a power generation unit. In some cases, it may be desirable to use these disengaged synchronous generators as phase shifter synchronous generators to generate reactive power or to receive reactive power from an electrical power distribution network. An idle synchronous generator must generally be decoupled from the turbine shaft before it can be used as a phase shifter synchronous generator. Instead, a starter motor can be connected to the shaft to bring the synchronous generator to operating speed. However, attaching a starter motor to the shaft can be time consuming. In addition, the starter motor must be designed to withstand any operational events, such as electrical faults in the motor or phase shifter synchronous generator, overspeed events, shaft damage, and the like. Sufficient amount of space and power may also be required to position and drive the starter motor or other devices used to rotate the shaft.
    There is therefore a need for an improved and / or simplified phase shifter synchronous generator. Such a phase shifter synchronous generator can generate and / or pick up reactive power to provide stability to an electrical power distribution network without the need for a starter motor or types of mechanical and / or electrical devices that require space and parasitic power to operate.
    Summary of the invention
    The present application and the resulting patent therefore provide a method of operating a phase shifter synchronous generator. The method may include the steps of: accelerating a gas turbine to no-load maximum-speed operating conditions, connecting a gas turbine-coupled generator to an electrical power distribution network, shutting off fuel flow to the gas turbine, operating the generator in a phase-shifter synchronous generator mode, and providing or receiving Reactive power for or from the electrical power distribution network.
    In any embodiment of the method, it may be advantageous for the step of operating the generator in a phase shifter synchronous generator mode to maintain the connection of the generator to a shaft of the gas turbine.
    In any embodiment of the method, it may be advantageous for the step of maintaining the connection of the generator to the shaft of the gas turbine to have the rotation of the shaft maintained.
    In any embodiment of the method, it may be advantageous that the method further comprises the step of generating active power after the connecting step.
    In any embodiment of the method, it may be advantageous that the method further comprises the steps of re-fueling the gas turbine and providing active power to the electrical power distribution network.
    In any embodiment of the method, it may be advantageous that the step of shutting off the fuel flow to the gas turbine comprises operating a compressor of the gas turbine with minimum operating conditions.
    In any embodiment of the method, it may be advantageous if the step of shutting off a fuel flow to the gas turbine comprises shutting off the fuel flow to a combustor of the gas turbine.
    In any embodiment of the method, it may be advantageous that the step of connecting the generator to the electrical power grid includes closing a generator breaker.
    In any embodiment of the method, it may be advantageous for the generator disconnecting switch to be closed as soon as the generator reaches a frequency, a voltage and / or a phase angle of the electrical power supply network.
    In any embodiment of the method, it may be advantageous for the step of operating the generator in a phase shifter synchronous generator mode to include the gas turbine not generating combustion gases.
    The present application and the resulting patent further provide a gas turbine. The gas turbine may include a combustor, a turbine, a generator, and a shaft connecting the turbine and the generator. The turbine rotates the shaft to drive the generator when the generator is in an active power mode and the generator rotates the shaft when the generator is in a phase shifter synchronous generator mode in which it provides reactive power.
    In any embodiment of the gas turbine, it may be advantageous that the generator is in communication with the electrical power grid.
    In any embodiment of the gas turbine, it may be advantageous for the generator to generate active power for the electrical power grid when the generator is in an active power mode.
    In any embodiment of the gas turbine, it may be advantageous for the generator to generate reactive power for the electrical power grid or to receive power from the electrical power grid when the generator is in the phase shifter synchronous generator mode.
    In any embodiment of the gas turbine, it may be advantageous for the generator to be in communication with the electrical power supply network by means of a generator disconnect switch.
    In any embodiment of the gas turbine, it may be advantageous for the gas turbine to also have a fuel flow to the combustion chamber in the active power mode.
    In any embodiment of the gas turbine, it may be advantageous for the gas turbine to also have a flow of combustion gases from the combustion chamber in the active power mode.
    In any embodiment of the gas turbine, it may be advantageous that the gas turbine in the phase shifter synchronous generator mode also has no flow of fuel to the combustion chamber and no flow of combustion gases from the combustion chamber.
    In any embodiment of the gas turbine, it may be advantageous for the turbine to be operated with no load maximum speed operating conditions prior to entering the phase shifter synchronous generator mode.
    The present application and the resulting patent further provide a phase shifter synchronous generator system. The phase shifter synchronous generator system may include a combustor, a turbine, a generator, and a shaft. The generator frees the shaft when the generator is in a phase shifter synchronous generator mode to provide and receive reactive power to the electrical power grid.
    These and other features and improvements of the present application of the resulting patent will become apparent to those skilled in the art upon review of the following detailed description and in connection with the several drawings and the appended claims.
    Brief description of the drawings
    [0026]<Tb> FIG. 1 <SEP> is a schematic of a gas turbine having a phase shifter synchronous generator system as may be described herein.<Tb> FIG. 2 <SEP> is a flowchart showing the operation of the phase shifter synchronous generator system of FIG. 1.
    Detailed description
    Referring now to the drawings, wherein like numbers refer to like elements throughout the several views, FIG. 1 is a schematic illustration of a gas turbine engine 10 as may be used herein. The gas turbine 10 may include a compressor 15. The compressor 15 compresses an incoming flow of air 20. The compressor 15 delivers the compressed flow of air 20 to a combustion chamber 25. The combustion chamber 25 mixes the compressed flow of air 20 with a pressurized flow of fuel 30 and ignites the mixture, to generate a flow of combustion gases 35. Although only a single combustor 25 is shown, the gas turbine engine 10 may include any number of combustors arranged in a circumferential arrangement or otherwise. The flow of the combustion gases 35 is in turn delivered to a turbine 40. The flow of combustion gases 35 drives the turbine 40 to produce mechanical work. The mechanical work generated in the turbine 40 drives the compressor 15 via a shaft 45 and an external load such as an electric generator 50 or the like. A number of bearings 55 may support the shaft 45 around the generator 50. The generator 50 may be in communication with an electrical power grid 60 or the like via a generator disconnecting switch 65. Other components and other configurations may be used herein.
    Gas turbine 10 may utilize natural gas, liquid fuels, various types of syngas, and / or other types of fuels, and mixtures thereof. Gas turbine 10 may be any of a number of different gas turbines offered by the General Electric Company of Schenectady, New York, including, but not limited to, such as a Series 7 or Series 9 heavy duty gas turbine, and the like , The gas turbine 10 may have different configurations and may use other types of components. Other types of gas turbines may also be used herein. Several gas turbines, other types of turbines, other types of power generators may also be used together herein.
    In the present example, the generator 50 may also be used as the phase shifter synchronous generator system 100, as may be described herein. Instead of using a starter motor and the like as described above, the phase shifter synchronous generator system 100 may be rotationalized by the gas turbine 10. Once the speed is reached, the shaft 45 can remain connected to the gas turbine 10 and rotate freely. The gas turbine 10 may therefore provide active power in a real power mode and reactive power in a phase shifter synchronous generator mode.
    An example of the operation of the phase shifter synchronous generator system 100 is shown in the flow chart of FIG. 2. In step 110, the gas turbine 10 may be brought to no-load maximum speed operating conditions by a static start or other types of conventional start-up procedures. In step 120, the generator disconnecting switch 65 may be closed as soon as the generator 50 has reached the frequency, the voltage and / or the phase angle of the electrical energy supply network 60. In step 130, the generator 50 may now provide power to the electrical grid 60 in the active power mode. In step 140, the flow from the fuel 30 to the combustor 50 may be turned off and the compressor 50 may be operated at minimum operating conditions, i. the starting taps may be open, the inlet guide vanes may be set in lower positions and the like. In step 150, the controls of the generator 50 may be adjusted to begin operation as the phase shifter synchronous generator system 100. In step 160, the phase shifter synchronous generator system may begin to provide megawatts for the electrical power grid 60, i. Reactive power (volt-ampere reactive power) in the phase shifter synchronous generator mode. The phase shifter synchronous generator system 100 may therefore generate or pick up reactive power in the phase shifter synchronous generator mode while the gas turbine 10 is connected to the rotating shaft 45. At step 170, the gas turbine 10 may be restarted if desired by refueling and subsequent conventional restart procedures. The gas turbine 10 can therefore again generate active power in the active power mode.
    The gas turbine 10 therefore provides both active power and reactive power to help provide grid stability. The generator 50 provides active power while in the active power mode and reactive power while in the phase shifter synchronous generator mode. In addition, the use of the phase shifter synchronous generator system also provides improved partial load capacity and reduction in overall emissions. Gas turbines typically have a minimum load required to meet emission requirements. The use of the phase shifter synchronous generator system 100 allows utilization to stay synchronized with the electrical power grid, but with fuel off and thus zero emissions. The gas turbine can be refueled and provide real power when needed. The gas turbine may therefore use the phase shifter synchronous generator system 100 without the use of a clutch or disconnection of the shaft 45 and the space required therefor. The phase shifter synchronous generator system 100 and the methods described herein may be original equipment or part of a retrofit. The phase shifter synchronous generator system 100 thus provides network stability, emission reduction and load shedding / load shedding in an efficient manner without the use of additional mechanical and / or electrical components and the required installation space.
    It should be understood that the foregoing refers to only particular embodiments of the present application and the resulting patent. Numerous changes and modifications may be made herein by one skilled in the art without departing from the general spirit and scope of the invention as defined by the following claims and their equivalents.
    The present application therefore provides a method of operating a phase shifter synchronous generator. The method may include the steps of accelerating the gas turbine to no load maximum speed conditions, connecting a gas turbine coupled generator to an electrical energy grid, shutting off a flow of fuel to the gas turbine, operating the generator in a phase shifter synchronous generator mode, and the Generating reactive power for picking up reactive power from the electric power grid.
    LIST OF REFERENCE NUMBERS
    [0034]<Tb> 10 <September> Gas Turbine<Tb> 15 <September> Compressor<Tb> 20 <September> Air<Tb> 25 <September> combustion chamber<Tb> 30 <September> Fuel<Tb> 35 <September> combustion gases<Tb> 40 <September> Turbine<Tb> 45 <September> wave<Tb> 50 <September> Generator<Tb> 55 <September> Bearings<Tb> 60 <September> Network<Tb> 65 <September> disconnectors<Tb> 100 <September> phase shifter synchronous generator system<Tb> 110 <September> accelerate<tb> 120 <SEP> close the circuit breaker<Tb> 130 <September> Power<tb> 140 <SEP> Turn off fuel<tb> 150 <SEP> Set controls<tb> 160 <SEP> Operate as a phase shifter synchronous generator<tb> 170 <SEP> reboot
    权利要求:
    Claims (10)
    [1]
    A method of operating a phase shifter synchronous generator, comprising:Accelerating a gas turbine to no-load maximum speed conditions;Connecting a generator coupled to the gas turbine to an electrical power supply network; Shutting off a flow of fuel to the gas turbine;Operating the generator in a phase shifter synchronous generator mode; andGenerating reactive power for or receiving reactive power from the electrical power grid.
    [2]
    2. A method of operating the phase shifter synchronous generator of claim 1, wherein the step of operating the generator in a phase shifter synchronous generator mode includes maintaining the connection of the generator to a shaft of the gas turbine.
    [3]
    3. A method for operating a phase shifter synchronous generator according to claim 1 or 2, further comprising the step of generating active power after the connecting step and / or further comprising the steps of refueling the gas turbine and providing active power for the electrical power grid.
    [4]
    4. A method of operating a phase shifter synchronous generator according to any one of the preceding claims, wherein the step of shutting off a flow of fuel to the gas turbine comprises operating a compressor of the gas turbine at minimum operating conditions and / or shutting off the flow of fuel to a combustor of the gas turbine includes.
    [5]
    5. A method of operating a phase shifter synchronous generator according to one of the preceding claims, wherein the step of connecting the generator to an electrical power grid comprises closing a generator disconnect switch, wherein the generator disconnect switch can be closed as soon as the generator has a frequency, a voltage and / or has reached a phase angle of the electrical power grid.
    [6]
    6. A method of operating a phase shifter synchronous generator according to any one of the preceding claims, wherein the step of operating the generator in a phase shifter synchronous generator mode includes the gas turbine not generating combustion gases.
    [7]
    7. Gas turbine comprising:a combustion chamber;a turbine;a generator; anda wave;wherein the shaft connects the turbine and the generator; andwherein the turbine rotates the shaft to drive the generator when the generator is in an active power mode and wherein the generator rotates the shaft when the generator is in a phase shifter synchronous generator mode.
    [8]
    8. The turbine of claim 7, wherein the generator is in communication with an electrical power grid, the generator providing real power to the electrical power grid when the generator is in an active power mode and / or wherein the generator generates reactive power to the electrical power grid or reactive power from the electrical power grid when the generator is in the phase shifter synchronous generator mode.
    [9]
    9. A gas turbine according to claim 7 or 8, wherein the turbine is operated at no load maximum speed conditions, before going into the phase shifter synchronous generator mode.
    [10]
    10. Phase shifter synchronous generator system comprising:a combustion chamber;a turbine;a generator; anda wave;wherein the generator rotates the shaft freely when the generator is in a phase shifter synchronous generator mode in which it generates or receives reactive power.
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    法律状态:
    2017-03-15| NV| New agent|Representative=s name: GENERAL ELECTRIC TECHNOLOGY GMBH GLOBAL PATENT, CH |
    2019-03-29| AZW| Rejection (application)|
    优先权:
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    US14/447,947|US9847640B2|2014-07-31|2014-07-31|Synchronous condenser|
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