Coordinated response of combined cycle power plant for block loading in grid restoration

Abstract

To provide a method for block loading an electrical grid with a combined cycle power plant (CCPP).SOLUTION: The method includes: operating a gas turbine system 14 in an islanding mode with a steam turbine system 16 of a CCPP 10 offline 46 with turning gear rotation only; loading the steam turbine system according to temperature matching conditions of the steam turbine system, where the loading step includes controlling gas turbine exhaust fed to the steam turbine system and the gas turbine exhaust temperature for heating the steam turbine system so as to meet temperature matching conditions, where the step of controlling the gas turbine exhaust includes controlling the fuel flow and the air flow; and operating at least one of the gas turbine system and steam turbine system to block load an electrical grid 144 from a load 42, 52 on at least one of the gas turbine system and steam turbine system.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this application relates to a combined cycle power plant, and more specifically, to a system, a control device Power supply for supplying power from the combined cycle power plant to the power grid Reach and a method.

Background Art

[0002] A combined cycle power plant combines a gas turbine system and a steam turbine system to generate power while reducing energy waste. Occur . driving Among them, the gas turbine system By burning the fuel-air mixture, generates torque to drive loads such as generators Make them stop . To reduce energy waste, the combined cycle power plant utilizes the thermal energy of the exhaust gas of the gas turbine system [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The steps include operating the gas turbine system of a combined cycle power plant in a standalone operation mode, and operating the steam turbine system according to the temperature compatibility conditions of the steam turbine system. Perform load testing Step, steam turbine system Perform load testing Step but, Controls the gas turbine exhaust supplied to the steam turbine system. thing and To meet the temperature compatibility requirements of the steam turbine system Controlling the gas turbine exhaust temperature that heats the steam turbine system. to do Includes And gas turbine exhaust control that , controlling the fuel flow rate and air flow rate to the gas turbine system thing Steps including, To block power supply to the power grid from at least one of the loads of the gas turbine system and the steam turbine system. Gas turbine system and Operating at least one of the steam turbine systems do Step and include.

[0005] Another aspect of this disclosure is , encompassing any of the above embodiments The gas turbine system is in standalone operation mode. sometimes Gas turbine system for combined cycle power plants only It supplies power to the power grid.

[0006] Further aspects of this disclosure are , encompassing any of the above embodiments , When the temperature compatibility conditions for the steam turbine system are met, Both gas turbine systems and steam turbine systems but It supplies power to the power grid.

[0007] This disclosure And yet another The manner is , encompassing any of the above embodiments , controlling the gas turbine exhaust temperature that , control the fuel flow rate to the gas turbine system thing Includes.

[0008] Further aspects of this disclosure are , encompassing any of the above embodiments , controlling the gas turbine exhaust temperature The thing , controlling the airflow to the gas turbine system thing Includes.

[0009] Another aspect of the present disclosure moreover is that the steam turbine system includes an exhaust heat recovery boiler, and the method further includes flowing gas turbine exhaust gas into the exhaust heat recovery boiler of the steam turbine system, and further controlling the temperature of the gas turbine exhaust gas supplied to the exhaust heat recovery boiler in accordance with temperature matching conditions for controlling the fuel flow rate to the gas turbine system. , encompassing any of the above embodiments <0舍000085> , encompassing any of the above embodiments Another aspect of the present disclosure load is that the following variable ru path is It includes block power supply to the power grid The aforementioned and load the variable , path is<舍 and steam [[ID=舍3]]control of the fuel flow rate to the turbine system, control of the air flow rate to the gas turbine system, The heat of the gas turbine exhaust the temperature matching conditions of the gas turbine system to rely on and at least one of temperature matching.

[0011] , encompassing any of the above embodiments One aspect of the present disclosure is that the steam turbine system includes an exhaust heat recovery boiler, and the method further includes flowing gas turbine exhaust gas into the exhaust heat recovery boiler of the steam turbine system, and further controlling the temperature of the gas turbine exhaust gas supplied to the exhaust heat recovery boiler in accordance with temperature matching conditions for controlling the fuel flow rate to the gas turbine system.

[0012] , encompassing any of the above embodiments Still another aspect of the present disclosure Satisfying the corresponding threshold is that after the temperature matching state between the gas turbine exhaust temperature and the temperature matching conditions of the steam turbine system is in established Power is supplied to the block. the power grid can be

[0013] , encompassing any of the above embodiments Still another aspect of the present disclosure parts <舍 And is that the step of operating the gas turbine system in a single - operation mode further includes the step of warming up the And steam turbine system.​This method involves the steam turbine of a steam turbine system It starts accelerating and reaches full speed. This further includes the step of operating the gas turbine system at an intermediate load.

[0014] Another aspect of this disclosure is , encompassing any of the above embodiments , steam turbine system Perform load testing The step is that the steam turbine of the steam turbine system enters inlet pressure control mode. Gas turbine exhaust gas The temperature compatibility requirements for the steam turbine system are Satisfied It will continue until [time].

[0015] Further aspects of this disclosure are , encompassing any of the above embodiments Once the temperature compatibility conditions are met If you are satisfied , gas turbine systems and steam turbine systems Perform load testing Step until the aforementioned load test is completed. Simultaneously continued rear, Loads connected to gas turbine systems and steam turbine systems This allows for continued power supply to the power grid. .

[0016] Further aspects of this disclosure are , encompassing any of the above embodiments , power grid by gas turbine systems To supply power to Step is steam turbine system As a result of running it under load, Support for auxiliary loads in combined cycle power plants but Loss break up to a certain extent There will be no reduction in power supply from the gas turbine system to the power grid. Controlled in this way be .

[0017] One aspect of this disclosure relates to a combined cycle power plant in a power grid. Power is supplied to the block. Provide a controller but The controller in question is, In a combined cycle power plant The gas turbine system of the combined cycle power plant Flexible operation and load control The controller teeth Steam turbine system for combined cycle power plants but off-line and Turning Only the gear rotate vinegar In standalone operation mode, the gas turbine system of a combined cycle power plant is operated. thing, according to the temperature compatibility conditions of the steam turbine system To run under load And, steam turbine system Load testing , controls the gas turbine exhaust supplied to the steam turbine system. thing and To meet the temperature compatibility requirements of the steam turbine system Controlling the gas turbine exhaust temperature that heats the steam turbine system. to do Includes And gas turbine exhaust control that , controlling the fuel flow rate and air flow rate to the gas turbine system thing Includes Being and, To block power supply to the power grid from at least one of the loads of the gas turbine system and the steam turbine system. Gas turbine system and Operating at least one of the steam turbine systems To make something possible.

[0018] Another aspect of this disclosure is , encompassing any of the above embodiments , Current The controller is, Furthermore, when the gas turbine system is in standalone operation mode Gas turbine system for combined cycle power plants only So that it can supply power to the power grid Manage ru.

[0019] Further aspects of this disclosure are , encompassing any of the above embodiments , When the temperature compatibility conditions for the steam turbine system are met, Both gas turbine systems and steam turbine systems but It supplies power to the power grid.

[0020] This disclosure moreover Another aspect is , encompassing any of the above embodiments The controller in question is, moreover, By controlling the fuel flow rate to the gas turbine system, the gas turbine exhaust temperature can be controlled. Manage ru.

[0021] Further aspects of this disclosure are , encompassing any of the above embodiments The controller in question is, moreover, By controlling the airflow rate to the gas turbine system, the gas turbine exhaust temperature can be controlled. Manage ru.

[0022] Another aspect of this disclosure is , encompassing any of the above embodimentsThe steam turbine system is equipped with a heat recovery boiler, and the controller is, moreover, The gas turbine exhaust gas flow is used to a heat recovery boiler for the steam turbine system. Send , and Further control the temperature of the gas turbine exhaust supplied to the heat recovery boiler to match the temperature compatibility requirements for controlling the fuel flow rate to the gas turbine system. vinegar ru.

[0023] One aspect of this disclosure is , encompassing any of the above embodiments The controller has the following variable load Access to the power grid via routes Block power supply In response to, The aforementioned variable load The route is , Control of fuel flow to the turbine system, control of air flow to the gas turbine system, and steam Temperature compatibility conditions for the turbine system and The heat of the gas turbine exhaust At least one of the degree of compatibility to rely on .

[0024] Summary of this invention It is written Including the manner in which , as described in this disclosure 2 or more The above embodiments are combined and described in detail herein. So Not a defined embodiment It is also acceptable to do so. .

[0025] 1 or more Details of the embodiment of, Attached drawings and the following description To be described ru. the Other features, purposes, and benefits are: Detailed information on the invention explanation 、 Clearly from the drawings and claims Naro cormorant.

[0026] Exemplary aspects of this disclosure are described herein. done The task and / or It is stated It is designed to solve other problems that have not yet been addressed.

[0027] This disclosure The above Other features About This disclosure variousEmbodiment This document describes the following: Please refer to the attached drawings. The following Detailed explanation You can deepen your understanding by referring to this. . [Brief explanation of the drawing]

[0028] [Figure 1] This is a schematic diagram of one embodiment of a combined cycle power plant equipped with a controller that enables load operation along various load paths, according to an embodiment of the present disclosure. [Figure 2] An exemplary and non-limiting graph illustrating a block power supply to the power grid by a combined cycle power plant after a blackout, according to embodiments of the present disclosure, showing a variable load path. [Figure 3] This is an exemplary and non-limiting graphical representation of block power supply to the power grid by a combined cycle power plant after a blackout, according to an embodiment of the present disclosure, showing Zone 1, Zone 2, and Zone 3. [Figure 4] This flowchart illustrates the block power supply to the grid by combined cycle power plants after a blackout occurs. [Modes for carrying out the invention]

[0029] Please note that the drawings in this disclosure are not to scale. figure The surface is a typical aspect of this disclosure. This is merely an example, This disclosure technical Something that limits the scope isn't it . figure surface In , similar sign teeth multiple Similar between drawings composition Represents an element.

[0030] First, the book To explain the technology clearly 、 on the power grid Power supply Inside a combined cycle power plant of Related machinery parts When referring to and explaining about, You need to select a term. . In this technology field, as much as possibleCommon terms, Use in a manner consistent with its usual meaning. . Unless otherwise stated, The terminology is, This application The context and the attached claims In accordance with Broad sense to Solution To explain It should. How many parts A few different or overlapping terms It will be obvious to those skilled in the art that this term is frequently used in reference. . In this specification , single Even if something is listed as a component, in a different context it may be multiple Number parts As consisting of Sometimes it is included. . Or , In a certain part of this specification multiple parts as including Even if it is written there, in another place single component as Sometimes it is included. .

[0031] Furthermore, in this specification Iku A few descriptive terms As I have repeatedly shown, , At the beginning of this column These terms It would be useful to do so. These terms and their definitions are provided separately. Clearly state Unless otherwise specified, the following applies: Use "Downstream" and "Upstream" the term teeth, Fluid flow (for example) Working fluid flowing through a turbine engine Flow , Or air passing through the combustor or Turbine Parts Coolant passing through one of them (Regarding the flow, etc.) It is a term that indicates direction. The term "downstream" refers to fluid. It flows away Corresponding to direction, the term "upstream" refers to flow. and Opposite direction (That is, the direction from which it is flowing) This refers to the terms "front" and "rear." It means that the direction will not be specified further. "Front" is in front of the engine. direction or compressor Indicating the end And, "rear" means behind the engine. direction or turbine Indicating the end vinegar.

[0032] Medium Different from the heart axis half Parts positioned radially About Need to explain There are many such cases. . half The term "radial direction" means shaft perpendicular to motion or position say For example, the first parts The second parts Rather than axis If it is close to In this specification teeth First parts The second parts of" half "Radially inward" or "closer to the inside" It is written as follows: On the other hand, the first parts The second parts A field located further from the axis than If In this specification teeth First The parts are The second part is half It is described as "radial outward" or "closer to the outside." The term "axial" is used. shaft parallel to motion or position say Finally, the term "circumferential" means Centered around the axis Movement or position stomach cormorant. It should be obvious, but The term refers to the center of the turbine. Applied in relation to the axis ru.

[0033] Furthermore, in this specification, The following is described below. As such, A few descriptive terms To show repeatedly . "The 1 "The 2 " and "The 3 The term " " is a parts of Other parts and To distinguish compatible , individual parts of position or importance Show No.

[0034] This specification Use The terminology is merely for the purpose of describing specific embodiments. Disclosure details Limit Rumo This is not the case. In, singular Even if it is stated there, unless it is otherwise clear from the context, multiple This includes the case of . In this specification, "Preparation" ru " and / or " include The term " " is Note The listed features, integers, steps, operation , composition elements and / or parts The existence of Show , other One or more features, integers, steps, operation , composition element, parts and / or The existence or addition of these groups This does not exclude stomach . any " or " Appropriately " the term teeth, The following terms were listed Event or situation It means you can wake up or not. , Such descriptions The event occurs cases and It won't happen. Includes cases .

[0035] This disclosure In, " Block power supply (block loading) and is network Ku recovery Old time to various Size load of This means supplying power to the block. Network recovery is not limited to blackouts, but is possible in some cases. After a grid failure It can be done For example, recovery should grid 1 in The lock is 1 to approximately 100 "units" (for example, This does not limit the embodiments, "Unit" housing , Individual To the meter Power supply etc. In the case ) and any number of other units ite That's good too. Subsequent The blocks are the above "1" block A number greater than or less than unit 、 For example, 5 units, 75 units, 250 units, 500 units, 1000 units also It contains any number of units It is possible This specification As described The number of units and blocks is as disclosed herein. Just an example Not too much, These embodiments are limited isn't it.

[0036] below, One of the present inventions The abovewill describe the embodiments. These embodiments The theory will be described. These embodiments To explain it concisely , Characteristics of actual implementation in this specification to cannot all be described Not having completely. Development towards implementation , every engineering or design projects Similar to the case , implementation Each one is different developers specific targets (This includes complying with system and operational constraints.) to achieve in order to , actual To unique many decisions It will be clear that this needs to be done. . moreover , such development work is complex It can sometimes take time, however , this For those skilled in the art who have access to the disclosures in the specification daily It is also clear that it is merely design, assembly, and manufacturing. .

[0037] When implementing the elements of the present invention various of the embodiments composition elements This article will introduce you to... , Singular form it means that the composition element exists<00​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ teeth , simply control system or software only Upgrade You should Therefore, the embodiments in teeth, In gas turbines and steam turbines, Blackout Woke up Restore the power grid It can be done Output of a combined cycle power plant Increase and Shorter power grid recovery time but realization So ru.

[0039] Another aspect of this disclosure is recovery after a blackout event. time power grid Power is supplied to the block. Therefore, in a combined cycle power plant (CCPP) ite Gas turbine response and steam turbine response of cooperation It can be done The operation control system for the gas turbine and steam turbine in the combined cycle power plant is used in the combined cycle power plant. keru The fuel flow rate and air flow rate can be adjusted. In, The fuel flow rate to the gas turbine is To improve the supply of power to the power grid Maintain the gas turbine speed at 100% of the gas turbine's rated speed. hold Controlled to do so be Therefore, the fuel flow rate of the gas turbine in a combined cycle power plant can maintain the frequency of the power grid. When a block of power load is added to the grid, the speed of the generator changes. temporary Drooping (descending) towards the target fear There is. Such droops Gas turbine system 14 machines hitting the mark The power supply to the load or generator 42 In short, not so quickly Unable to respond ni Koru. the result, Gas turbine system 14 and Shaft 40 to Torque imbalance Occurring This can lead to deceleration or "drooping." Drooping during block power supply is, Increased mechanical output leads to increased electricity demand and equilibrium vinegarContinue until Sometimes In this case, the frequency response of the combined cycle power plant 10 is considered as two separate parts. Capture It is possible. One part teeth , Normally when supplying power This is due to the droop. Initial fast response portion It can be defined as follows: , After that, Caused by a "pseudoisochronous" control loop Second delayed response portion The story continues The fuel flow rate of the gas turbine is To restore the gas turbine speed and output of a combined cycle power plant so that it can be resupplied to the power grid, In this disclosure related control scheme Reach bipu Adjusted by Rothes be .

[0040] This and at the same time Katsuga Fuel flow rate to the turbine In cooperation with hand, Ga Turbine exhaust temperature is stable and substantially constant maintain So so The airflow rate of the gas turbine Adjustment and control vinegar ru. certain Gas turbine exhaust temperature teeth Constant steam operation of the steam turbine in a combined cycle power plant Bringing about conditions This disclosure In, The fuel flow rate and air flow rate of the gas turbine are controlled independently. to By controlling That The operation of gas turbines adds a block of load to the power grid. of absorption while , for the restoration of the power grid (Omitted) Constant grid frequency and grid load of maintain It is possible This disclosure In, Fuel flow rate and air flow rate of a gas turbine of Independent control teeth Starting the steam turbine of a combined cycle power plant Reach and the steam turbine relative to the generator of a combined cycle power plant Load operation moreover Support , ultimately teeth Power grid restored ru .

[0041] to the grid after blackout Block power supply is As soon as possible aimed at restoring the power grid vinegar . In restoring the grid, the network Ku recovery restore time should supply blocks of power loads of appropriate various size to the grid. For example, as described above G , in restoring As the grid should blocks 1 in can include any number of units, such as 1 to 100 "units" (e.g., This does not limit the embodiments, where "unit" is housing , Individual to the meter Power supply etc.) In the case . Blocks , the following can be 、2 50 units, 500 units, 1000 units or more, Or more or less than the first block. including any number of units It is possible . In some cases, there are limitations on the block size but , but the embodiments of this specification are It can also be done usable with blocks of appropriate size various . The number of units and blocks in this specification is not excessive It is thought that as per the present disclosure As described . Just an example When supplying to the grid These embodiments are limited , Needless to say, G timeliness Power restoration and Power restoration promptness and are important elements but . The combined cycle power plant shows rapid response This will be flexibility in operation as long as the startup of the gas turbine from a blackout Load operation does not adversely affect the operation of the steam turbine (Especially gas turbine operation) , and is very suitable for Sex and grid Therefore restoration Do . There are .

[0042] thus , the present disclosure In, controls the gas turbine of the combined cycle power plant of ​ and management to Yo That , for example Blackout Later , electric To the force grid A significant portion of the electricity supply is supplied. It is possible ru Gas turbines in combined cycle power plants of control and management teeth , Furthermore, afterwards Power from steam turbines to the power grid Includes block power supply Conditions for Provide but, Block power supply to the power grid using steam turbines like this. This refers to the methods and control of some combined cycle power plants. On teeth Some things cannot be achieved. be.

[0043] Previous , major in combined cycle power plants Block power supply The steam turbine is a mechanism Because it was used , steam turbines and steam systems for Major physical changes but Need So Physical change as The control of the steam turbine scheme Reach Bip Rothes, Furthermore, although not limited to, Steam turbine piping and control valves beginning Steam system hardware Regarding Changes Listed Also, steam turbines of change by , Block power supply time of The response and steam generation from the heat recovery steam generator (HRSG) There is a risk of delays. There are also others.

[0044] Therefore, the embodiments of the model are combined cycle power plants by, Blackout Woke up Power grid To restore power in [location] Mechanism, control device Reach We will provide a method ru Furthermore, in the embodiment, the blackout is Woke upMechanisms and control systems for a combined cycle power plant that transitions the power grid from grid restoration to normal operation. Reach We will provide a method ru .

[0045] mentioned above As In some combined cycle power plants, Ga St Turbine steaming Operates independently of the turbine. in Therefore, blackout Woke up Power grid restoration I can't There are cases where this is the case. like In combined cycle power plants, gas turbines of system Your , fuel flow rate and air flow rate of a gas turbine in a combined cycle power plant and They are working closely together. These Strong cooperation , predetermined single load route This can lead to . Single load In the route, appropriate from the combined cycle power plant Block power supply (especially Blackout later Combined cycle power plant (Block power supply) may not be available. There is.

[0046] Therefore, this disclosure In, Gas turbines in combined cycle power plants (especially) After the blackout occurred of Combined cycle power plant For block power supply ) Flexible load routing is provided. . Soft soft load The route is, Commercially available from General Electric (Schenectady, New York, USA) Variable load This indicates the variable load path (VLP) in OpFlex or gas turbine control systems. load The route is part of the existing gas turbine control Seen in the scheme Tight synchronization of fuel flow rate and air flow rate in a gas turbine By easing the restrictions ,variable load route and flexibility Bringing about .

[0047] This disclosure In, flexible load Route and variable load Gas turbine with pathways control This refers to fuel flow rate and air flow rate. of independence to control and adjustment do Gasstarbi Nun Turn support Control scheme It incorporates. Further embodiments in teeth, The fuel flow rate to the gas turbine, Gas turbine speed and Grid frequency few Even without it, one side Linked or proportional Let Furthermore, this disclosure In, Airflow to the gas turbine of , 1 That's all. Steam turbine operation and Linked or proportional Let ru.

[0048] Therefore, these embodiments are based on the operating conditions of the steam turbine. ite Standard or target values ​​for gas turbine exhaust temperature Bringing about . thus Gas turbine exhaust temperature based on steam turbine operating conditions of , operation of these combined cycle power plants Consistency and coordination with the form To allow. Furthermore, this disclosure In, Adjusting the gas turbine exhaust temperature in a combined cycle power plant depends on the operating conditions of the steam turbine. ( example Ba "Warm" 、 "hot" also It started "cold". (Proportional to the operating conditions of the steam turbine) .

[0049] In this disclosure related Control devices, systems and method teeth , Start-up time of combined cycle power plant (especially B From a rack-out state (Until power is supplied to the power grid) shortening can To put it another way. Then , control device, system Reach Method teeth , blackout state After or the first load condition Like a state From no-load scenarios to base load or secondary load conditions, combined cycle power plants of Operation of gas turbines and steam turbines of increase Let me , desired in the power grid Power can be supplied so vinegar The control devices and systems described herein. and method teeth , gas turbine variable Load operation steam occurrence Through increased volume, the start-up time of combined cycle power plants Can be shortened Furthermore, a further embodiment of the embodiment is a heat recovery boiler (HRSG) of a combined cycle power plant. at To promote steam generation, the gas turbine exhaust gas temperature and the gas turbine load Control What to do can ru shi The system and method are provided. Thus, the HRSG of a combined cycle power plant. teeth The steam turbine of the combined cycle power plant , block load scenario at To the power grid Power supply It is possible to generate steam at a temperature and pressure sufficient to contribute to this. Block load The scenario is a combined cycle power plant. in Power grid Power is supplied to the block. Starting a steam turbine promotion so Can be operated ru.

[0050] Figure 1 shows Various loads along the route Load operation of Make it possible Equipped with controller 12 ru This is a block diagram of one embodiment of a combined cycle power plant 10. In, Controller 12 teeth Combined cycle power plant 10 of Non-operating state (i.e., no power output) situation ) to operating state (i.e., power grid RequiredIn a state where there is power output condition ) to rapidly increase power output (i.e., on load Ascension ) can be made to do so ru In other words... Then Controller 12 teeth The combined cycle power plant 10 is connected to the power grid. Power supply So that you can start the steps vinegar More specifically, controller 12 teeth Combined cycle power plant 10 at vapor occurrence Increase in quantity and generation Increase in speed Through this, the power output from the gas turbine system 14 and the steam turbine system 16 of the combined cycle power plant 10 is increased. ru .

[0051] The combined cycle power plant 10 comprises a controller 12, a gas turbine system 14, a steam turbine system 16, and a heat recovery steam generator (HRSG) 18. driving In the middle, the gas turbine system 14 burns a fuel-air mixture, for example, It is not limited to, but like a generator Load 42 and / or Load 52 ( See below Generates mechanical power to drive ) vinegar To reduce energy waste, combined cycle power plants 10 teeth The thermal energy of the exhaust gas from the gas turbine system 14 Interest Using HRSG18, the fluid is heated. hand steam generate The steam moves from HRSG18 through the steam turbine system 16 to load 42 of Drive Use It generates torque. Although not shown in the diagram, the generation of steam in HRSG18 and the subsequent generation of torque in the steam turbine system 16 are carried out in a single-shaft combined cycle power plant 10 having a single shaft. in realization It is also possible Torque is applied independently from both the gas turbine and the steam turbine. deathTherefore, the combined cycle power plant 10 can increase power generation while reducing energy waste by combining the gas turbine system 14 with the steam turbine system 16.

[0052] The gas turbine system 14 comprises an air flow control module 20, a compressor 22, a combustor 24, and a turbine 26. driving In the middle, oxidizing agent 28 (for example, It is not limited to, Air, oxygen, oxygen-enriched air also is oxygen reduction air degree ) causes oxidation of the gas turbine system 14 Drug flow Quantity (hereinafter referred to as "airflow rate") say ) passes through the airflow control module 20 that controls the gas turbine system 14 Introduced The airflow control module 20 controls the flow of the oxidizer. heating , flow of oxidizing agent Cooling From compressor 22 of airflow Extraction , Use of intake restriction mechanism ,entrance Guide wings (Inlet guide vane: IGV) Use or child These combinations control the airflow. It is possible Explanation Concise To that end, embodiments of the present disclosure Ga As a device for controlling the airflow rate to the turbine system 14 IGV will be used as an example. As the airflow passes through the airflow control module 20, the airflow flows into the compressor 22. The compressor 22 is one A series of compressor stages or Equipped with compressor blades low Knotweed Disc 30 in Compress the air 28. Compressed air comes from the compressor 22. Discharge As a result, an airflow enters the combustor 24 and mixes with the fuel 32.

[0053] The gas turbine system 14 is powered by natural gas and / or hydrogen-enriched synthesis gas. like liquid fuel orGaseous fuels can be used. For example, the fuel nozzle 34 controls the amount of combustion, emissions, and fuel consumption. Reach Furthermore, to increase power output, a fuel-air mixture can be injected into the combustor 24 in an appropriate ratio. (Figure) to As shown, the multiple fuel nozzles 34 take in fuel 32 from the fuel flow. And Mix fuel 32 with air. death Next, the air-fuel mixture is distributed to the combustor 24. The air-fuel mixture is then distributed to the combustion chamber in the combustor 24. in combustion do high temperature High pressure The combustor 24 generates exhaust gas. The exhaust gas is passed through the gas turbine 26 to the exhaust port 36. to Send. Exhaust gas But The Turbine 26 Flowing Once you pass through, the gas will turbulent Nro - Knotweed Disc 38 or turbine blades mounted on the turbine stage and Contact is made. As the exhaust gases move through the gas turbine 26, the exhaust gas flow causes the turbine blades to move. Knotweed Rotate disc 38 Let .low Knotweed As the disc 38 rotates, the low in the shaft 40 and the compressor 22 Knotweed The rotation of disc 30 trigger It will be done. Load 42 (for example) It is not limited to, but like a generator ) is directly connected to shaft 40, and the rotational energy of shaft 40 is used to power grid 144 in use So The electricity generate Grid 144 is a combined cycle power plant 10 for its customers. ( For example, substations, power distribution nets, etc. ) to This shows any power infrastructure for transporting energy.

[0054] mentioned above As The combined cycle power plant 10 is Ga From the turbine system 14 discharge From the high-temperature exhaust gas For use in the steam turbine system 16 Energy Collect This disclosure In, The combined cycle power plant 10 sends the high-temperature exhaust gas 44 from the gas turbine system 14 to the heat recovery steam generator (HRSG) 18. ru The HRSG 18 In converts the thermal energy in the combustion exhaust gas by into but high-temperature pressurized steam. So Then the HRSG 18 is used in the steam turbine system 16. The steam released into line 46 Yes, you can.

[0055] The steam turbine system 16 includes a steam turbine 48, a shaft 50, and a load 52 ( It is not limited to, but like a generator ). When the high-temperature pressurized steam in line 46 flows into the steam turbine 48, It is not limited to, but such as turbine stages the steam contacts the turbine blades mounted on the turbine Nro - Knotweed disc 54. As the steam passes through the turbine stage of the steam turbine 48, steam the turbine blades Rotate it cause the Knotweed rotation of the low trigger -speed disc 54.

[0056] When the low Knotweed -speed disc 54 rotates, and the shaft 50 rotates. As shown to in the figure, the load 52 (for example, a generator) is connected to the shaft 50. be Therefore, when the shaft 50 rotates, the load 52 uses the rotational energy to generate electric power for the power grid 144. When the pressurized steam in line 46 passes through the steam turbine 48, the steam loses energy cormorant( i.e., the steam expands and cools. (Meru) The steam from the steam turbine 48 Discharged is returned After flowing into condenser 49 to the HRSG 18 As a water supply and converted into steam for reuse in the steam turbine system 16. 、 There in be

[0057] As described above, the controller 12 As teeth Combined cycle power plant 10 of From a non-operating or no-load state, te Power supplied to grid 144 Generate electricity Rapidly increases output to reach an operating state (also known as load increase). It is possible The operating state is when a specific load is applied. added and Load sent It is in that state. In other words, Controller 12 teeth Combined cycle power plant in Flexible gas turbine system 14 Load operation So that vinegar Gas turbine system 14 Flexible load operation , steam in HRSG18 occurrence Increase the quantity It was possible The steam turbine system 16 was started relatively quickly. You will be able to The combined cycle power plant 10 was quickly started up. hand Increase the combined load or power output from the gas turbine system 14 and the steam turbine system 16. The ability to do Efficiency of combined cycle power plant 10 To improve . Needless to say, Efficiency of combined cycle power plant 10 When it improves ,time and cost of Save money ru .

[0058] The combined cycle power plant 10 itself is 2 or more It may also be equipped with a gas turbine system 14 and a steam turbine system 16. However, Figure 1 is included simply for the sake of explanation. Gas turbine system 14 and steam turbine system 16 Only one of each Showing do not have The compressor 22 has a set of inlets within the airflow control module 20. Guide wings (IGV) may be included. IGV (understanding) To make it easier (Not shown in the diagram) The flow of the working fluid into the compressor 22 moving blade As if to lead to composition So Ta-cho Adjustable compressor inlet A type of wing The IGV controls the flow rate of the fluid entering the compressor 22. inflow angle degree and / or other characteristics In order to influence , how many that position to may be adjustable. I GV is the temperature of the compressor 22, the gas turbine system 14 of power generation output and exhaust gas temperature and / or other characteristics It can have an impact .

[0059] The controller 12 includes a memory 56 and a processor 58. The memory 56 life commands and steps (For example, instructions and steps written in software code) stores vinegar . The processor 58 executes the stored instructions in response to feedback from the combined cycle power plant 10. More specifically, the present disclosure In, The controller 12 To flexibly control the load operation of the gas turbine system 14, controls the combined cycle power plant 10 various parts and So communicates with them do . By controlling the load of the gas turbine system 14 driving , the load of the steam turbine system 16 That can be controlled. As shown in the figure driving , the controller 12 controls the air flow control module 20, the intake and flow of the fuel 32 to . Further, the controller 12 communicates with the load 42, the exhaust gas temperature sensor 60, the HRSG steam temperature sensor 62, and the steam turbine metal temperature sensor 64 to apply a load to the combined cycle power plant 10 along different vinegar . Also, the controller 12 load routes. vinegar .

[0060] To those skilled in the art This should be obvious, , the present disclosure is as a system, method or computer program product Implementable . Therefore, to the present disclosure relatedThe controller 12 may take the form of a completely hardware embodiment, a completely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software and hardware aspects, all of which can be generally referred to herein as “circuit,” “module,” or “system.” Furthermore, this disclosure also includes computer-usable programs embodied in tangible media. Muko Any tangible medium of expression having a code It will be implemented in It may take the form of a computer program product.

[0061] 1 That's all. Computer-compatible media or computer-readable media of any The combination Controller 12 in Alternatively, it can be used as controller 12. death Computer-usable media or computer-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, devices, or propagation media. A more specific (non-exclusive) list of computer-readable media includes: That's all. Electrical connection with wiring, portable computer tough Loppy disk, hard disk, rand Moore Habit SumeThis includes RAM, read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disc read-only memory (CD-ROM), optical storage devices, transmission media such as media supporting the Internet or intranet, or magnetic storage devices. The computer-usable medium or computer-readable medium may be paper on which the program is printed or another suitable medium, and the program may be electronically captured, for example, via an optical scan of the paper or other medium, then edited, interpreted, or processed in an appropriate format as needed, and then stored in computer memory. In the context of this specification, the computer-usable medium or computer-readable medium may be any medium that can store, transmit, propagate, or transfer programs, including programs used by or in conjunction with an instruction execution system, instruction execution unit, or instruction execution device. Memory and / or storage systems include magnetic media, optical media, and other media. Moore Habit Sume Including RAM (memory data), read-only memory (ROM), etc. various This may include any combination of non-temporary computer-readable storage media of any format. Ko Computer-compatible media are computer-compatible programs in the baseband or as part of the carrier wave. Muko The code may include a propagating data signal in which the code is embodied. Ko Computer-compatible programs Muko The code is, It is not limited to, Wireless, wired, fiber optic cables, RF, etc. beginning It may be transmitted using any suitable medium.

[0062] This disclosure In, Computer for executing the operation of controller 12 Tap Logra MukoThe code includes object-oriented programming languages ​​such as Java, Smalltalk, or C++, and traditional procedural programming languages ​​such as the C programming language or similar languages. That's all. By combining any programming languages description It may also be used. P Logra Muko The software may run entirely on the user's computer, as a standalone software package, with some parts running on the user's computer, some running on the user's computer and some on a remote computer, or entirely on a remote computer or server. In the latter scenario, the remote computer is local. Rue Ri Ane The user's computer may be connected via any type of network, including a LAN or a wide area network (WAN). Or , to an external computer (for example, the internet Tosa -bi Sup The connection may be made via the internet using a provider.

[0063] These computer program instructions may also be stored in a computer-readable medium that can instruct a computer or other programmable data processing device to function in a specific manner, thereby allowing instructions stored in the computer-readable medium to be used in flowcharts and / or block diagrams. That's all. The manufacturer produces a product that includes instruction means for performing the functions or operations specified in the block.

[0064] Instructions executed on a computer or other programmable device are represented in a flowchart and / or block diagram. That's all. To generate a computer-implemented process by having a computer or other programmable device execute a series of operational steps to provide a process for performing the function or operation specified in the block, KoComputer program instructions may also be loaded onto a computer or other programmable data processing device.

[0065] driving In the middle, the controller 12 controls the load of the gas turbine system 14. driving To change this, the airflow control module 20 and the fuel consumption 32 are managed. sky Airflow control module 20 and Fuel consumption of 32 of management Thus Load of gas turbine system 14 Driving control vinegar ru. Also , airflow control module 20 and Fuel consumption of 32 of management teeth Load of combined cycle power plant 10 Driving control vinegar To put it another way. Then , this disclosure In, Airflow control module 20 and Fuel consumption of 32 of management teeth , load of gas turbine system 14 driving Control and It can be changed. So Therefore, the combined cycle power plant 10 from Power grid 144 supplied to Power generation Power It can be controlled.

[0066] In further embodiments of these embodiments, the controller 12 adjusts the mass flow rate and temperature of the gas turbine exhaust gas 44. do , Steam in HRSG18 Turbine system 16 For vapor Generation speed Control the degree. Adjust the mass flow rate and temperature of the exhaust gas 44. and Combined cycle power plant 10 in Loads 42 and 52 Used electric power of raw growth rate This is controlled. For example, in these embodiments This does not limit the scope. However, controller 12 byWhen the airflow rate is increased using the airflow control module 20, pressure Through the shrinking machine 22 airflow , through the combustion chamber 24 The flow and Passing through gas turbine 26 Increase the flow rate of the flow Therefore, when the airflow rate increases, So In response to this, the mass flow rate of the exhaust gas Increase Torque of shaft 40 too It increases.

[0067] Furthermore, as the mass flow rate of exhaust gas 44 increases, HRSG18 Can be used for steam generation. The amount of thermal energy increases, Or H RSG18 This will allow for an increase in the flow of exhaust gas 44 that enters and passes through. HRSG18 at vapor occurrence amount of increase teeth , the starting time of the steam turbine system 16 shorten It is possible. Therefore, HRSG18 at vapor occurrence amount of increase teeth , steam turbine system 16 To speed up the start Power generation output from load 52 to grid 144 of It can save time.

[0068] mentioned above As Controller 12 is, Gas turbine system 14 fuel flow rate and consumption Control vinegar Fuel 32 The flow rate control is , mass flow rate through gas turbine system 14, and HRSG18 Available This affects the amount of thermal energy. Therefore, this disclosure In, Controller 12 in Increasing the fuel consumption of the gas turbine will raise the temperature of the exhaust gas 44. and , In response to that HRSG18 The temperature and pressure of the steam produced increase. .vapor of temperature and Stroke As the power increases, the amount of electricity generated by the steam turbine system 16 increases. Possible However, controller 12 inReducing fuel consumption will In response to that Exhaust gas temperature 44 of A decline occurs It's possible Exhaust gas temperature 44 Low degree When lowered, load 42 of Drive Available for The amount of mechanical energy decreases. It's possible As a result, the steam turbine system 16 in Drives load 52 for Generates steam Can be used when doing so The amount of thermal energy decreases. fear There is.

[0069] Controller 12 blacked out. After the situation , Combined cycle power plant 10 Various loads route by variable Block load driving It is possible Structured in such a way be The controller 12 is as described herein. As , Block load for multiple In the zone multiple Combined cycle power plant 10 Load and operation Adjustment or control vinegar Referring to Figures 1 and 3, The Zone 1 In other words, in the part of block load operation after a blackout situation teeth, Ga Turbine System 14 Only then is it operational. Grid 144 to Power is supplied ru . G Lid 144 Block power supply This zone where So , The steam turbine system 16 went offline. Turning The gear level rotates. The gas turbine system 14 meets the requirements of grid 144. Block power supply according to the system of support death, various A block of large load is added to power grid 144. When removing or when being removed from the power grid 144 The frequency is maintained within a predetermined range of the power grid 144.

[0070] To ensure that the frequency remains within a predetermined range of the power grid 144 to , GaThe turbine system 14 is In Zone 1 This mode is known as "pseudoisochronous mode". Driven This pseudo-isochronous mode is used in gas turbines. of In standalone operation mode driving When Commonly used Control mode, electrical frequency of power grid 144 of adjustment of The clear purpose is to load the power grid 144 or the generator 42 of control vinegar ru.

[0071] Blackout Block load after the situation of Features , an immediate increase in the load of the combined cycle power plant 10 or the power output to the generator 42 One example is... However, the gas turbine system 14 machines hitting the mark The power supply to the load or generator 42 In short, not so quickly Unable to respond to, Gas turbine system 14 and Shaft 40 to Tor Ku not equilibrium Occurring , mentioned above like Slowing down or "drooping" This could lead to There is. Drooping during block power supply is Increased mechanical output leads to increased electricity demand and equilibrium vinegar Continue until Sometimes Frequency response of combined cycle power plant 10 teeth As two separate parts Capture It is possible. One part teeth , Normally when supplying power This is due to the droop. Initial fast response portion It can be defined as follows: , After that, Caused by a "pseudoisochronous" control loop Second delayed response portion The story continues The "pseudo-isochronous" control loop is under load rotation Speed ​​is nominal value (For example, nominal values ​​for 50Hz or 60Hz when the load is a generator) Ma up Act to raise do .

[0072] In normal standalone operation or pseudo-isochronous operation, the inlet of the gas turbine system 14 Guide wings (IGV) adjusts the exhaust temperature and / or according to the load demand of the gas turbine 26. combustion Temperature control vinegar Normally, the temperature of the exhaust gas 44 of the gas turbine 26 or combustion Temperature control is conventional load It will be carried out along the route. However, the combined cycle power plant 10 Block load In the scenario ( especially After the blackout In the block load scenario) The temperature of the gas turbine exhaust gas 44 is determined according to the temperature requirements of the steam turbine 48, specifically the temperature compliance requirements of the steam turbine 48. of control Must . Not limited to, but especially block load Initial stage in Acid Such control is The exhaust gas temperature is the starting temperature of the steam turbine. for Meets steam temperature requirements Ta In this state, steam turbine system 16 of Efficiently and effectively Make it possible to bring it back online .

[0073] This disclosure In, According to one aspect Block load is speed or grid frequency of control of Therefore 、 Gasstarbi N's loss Separate the load to control thing This includes. related Combined cycle power plant 10 Block load is a steam cycle of Start for The temperature of exhaust gas 44 is independently to control thing This includes. Block load or The exhaust gas is 44 It is commonly used to achieve independent temperature control. control method as 2 The method exist. Method 1 The temperature is suitable joint system He is a god, Method 2 is variable load Route (VLP) ) system It is the Lord.

[0074] This temperature suitable joint system Your teeth Typically, The standard or target temperature is current Exhaust gas 44 warm Lower than degrees stomach Combined cycle power plant 10 Spinning reserve status It will be carried out at a suitable temperature. joint system Your So , warm Degree compatible To reach need The worst Exhaust gas 44 temperature to reach Up to the minimum IGV airflow position The first load The gas turbine system 14 is operated. At this point, the air flow control device 20 of the gas turbine system 14 of IGV Open from the minimum airflow position. , exhaust gas 44 temperature of standard Exhaust temperature degree goal Fits the value did Sustained exhaust temperature low Let it down ru In the normal startup process, At this point, the load on gas turbine 26 remains fixed. Exhaust gas 44 Temperature reference target value It gradually rises towards the isotherm. death, The IGV returns towards the minimum airflow position. So When the minimum airflow position is reached, To continue to track the reference temperature for exhaust gas temperature 44, Load of gas turbine system 14 but ,as needed, Increase Add thing There is. joint system Your Sometimes The load on the gas turbine system 14 follows the required temperature of the exhaust gas 44. Therefore , load independent Standing system Your It cannot be realized. Therefore, this "standard" exhaust temperature is suitable. joint system What is your method? Block load Driving and teeth Balancing both do not .

[0075] So , For block load operation of the combined cycle power plant 10, In this disclosure related variable load Route (VLP) is used VLP is, Block load time in Exhaust gas 44 temperature Independent control of It provides a flexible approach for this purpose. VLP provides simultaneous and independent control of the load and exhaust temperature of the gas turbine system 14. Simultaneous and independent control of the load and exhaust temperature of the gas turbine in VLP controls the fuel flow rate and air flow rate to the gas turbine system 14. separate This is achieved by adjusting the operating boundary of the gas turbine system 14 and the combined cycle power plant 10. Subject to the constraints of This results in an "operating space" that is not constrained by a single load or operating "path".

[0076] In this disclosure related VLP Power supply The route is in "load priority" mode. and Emissions from combined cycle power plant 10 Regulatory limits Disabling Block loads accompanied by Support driving vinegar Using the pseudo-isochronous control according to these embodiments Block load IGV in Exhaust gas 44 warm Control the degree ru V It can be used in conjunction with LPs.

[0077] Figure 2 shows the operation of the steam turbine system. The above constraints Related GT Block load This is a diagram showing the route. Outside the solid line in Figure 2 frame teeth, This diagram shows the operating boundary of the variable block load path relating to this disclosure, with the gas turbine exhaust temperature shown on the vertical axis and the gas turbine load on the horizontal axis. Gas turbine exhaust temperature teeth Fuel flow rate to the gas turbine system and Airflow of It is a function, and also gas turbine exhaust temperature teeth Steam turbine system For load testing Specific temperature adaptations for steam turbine systems The conditions are met. It is necessary to do so, and as a result, to the power grid 144 Block power supply but It becomes possible, solid line Surrounded by The area is connected to power grid 144. Block power supply At times multiple Variable of combined cycle power plant 10 loadShow the route vinegar .

[0078] This disclosure In, Power supply to power grid 144 At the time Combined cycle power plant Block load Therefore multiple different Operating area In other words "Zone" is VLP stipulated difference be These zones are used during the startup of combined cycle power plants. During block load Depending on the operating conditions of the steam turbine fundamentally It is decided. Figure 3 shows three different zones: Zone 1, Zone 2 Reach Zone 3 at Typical "warm" start Block load This indicates.

[0079] Referring to the diagram including the flowchart in Figure 4, Zone 1 is in Z1.1, Gas turbine system 14 of combined cycle power plant 10 only but online Startup complete 、 No-load rated speed operation (FSNL) degree Adjustment Block load region dea The steam turbine system 16 is offline. dea In other words, in Zone 1, turning Only the gears rotate Also, Zone 1 teeth In Z1.2, HRSG18 and related Rensui The water steam cycle (WSC) is used for GT exhaust. absorb warm up vinegar ru. Zone 1 Z1.3 So, Gastarbi Blocking The circuit breaker Closed gas turbine teeth Intermediate operation situation from Proceeding , unit To supplement It absorbs the auxiliary load. negative load and To maintain balance and speed control Gas turbine fuel increase Let , the IGV of the gas turbine, steaming Suitable for air turbines didIt responds to maintain the gas turbine exhaust temperature. In Z1.4, the gas turbine various Variable number Large block load In response, the fuel flow rate is increased to maintain frequency (or speed) control and to accommodate the steam turbine. did Open the IGV to maintain exhaust temperature. Ku In Z1.5, the status of HRSG and WSC is such that the steam is supplied to the steam turbine. For the introduction suitable It was done Until then, gas turbine The current situation level Keep .

[0080] Zone 2 is a combined cycle power plant 10 Block load This indicates the vapor state. teeth This makes it suitable for starting the steam turbine. In Z2.1, the steam turbine at full speed Accelerating to that point, Bring back online In Z2.2, the steam turbine Returning to online Then, steam turbine Power generation The power that is used in gas turbine Power generation amount To compensate for the decline In Z2.3, the grid load additional A block was added. these are Power generation from both gas turbines and steam turbines of increase by It is absorbed. Gas turbines are steam turbines. luck Maintains optimal exhaust temperature control for operation.

[0081] Zone 3 is a combined cycle power plant 10 Block load This indicates that in Z3.1, the thermal state of the steam turbine has limitations on the operation of the gas turbine. So More than this is needed. It will no longer be considered that way. The point is reached. In Z3.2, Furthermore, with larger and more frequent block loads Unlimited use of gas turbines and steam turbines Block load Reopening So ru.

[0082] According to another aspect of this disclosure, Block loadThe fourth zone of the VLP period is the combined cycle power plant 10 and the gas turbine system 14 of Return to "normal" full-load operation (final step in Figure 4) P ) shows. Here, Control The restored power grid 144 brought about . To power grid 144 More than block load Under standard droop control, of Provided by power supply command.

[0083] In Zone 1, the gas turbine system 14 emits its exhaust gas 44 warm The degree required for starting the steam turbine system 16 Na temperature, In other words The above temperature compatibility conditions satisfies Adjust Must Zone 1 is the subject of this disclosure. In, Gas turbine system 14 in Grid 144 Block power supply, And its exhaust gas 44 warm While adjusting the degree to HRSG18 but warm up So Steam generation Accumulate And, the high pressure of HRSG18 ( H P) Start pressurizing the header (HRSG18 valves, seals, headers, piping) Other Details, To make it easier (Not shown in the illustration.)

[0084] Flame in gas turbine system 14 but detection It will be done And, HRSG18 teeth Considered to be "operating" or "in operation" It is possible In this "operating" state of Zone 1, the present disclosure In, HP bypass valve opens ite HP Head Steam The control when generating gas to pressurize the HRSG18 reheat piping system is Possible Yes. When the pressure in the HRSG18's reheat piping system rises, the HRSG's vent valve opens. ite This adjusts the pressure in the HRSG's reheat piping system. valve By opening ThatFurther pressure paths to ambient pressure are formed within HRSG18. At a constant reheat piping steam pressure, the gland steam system and steam turbine seal are established. re , steam turbine system 16 Condenser Emissions or "exhausts" caused by this start be . Condenser When the pressure drops and steam flows in, HRSG18 1 That's all. The bypass valve opens ite The pressure in the reheat piping system can be adjusted in preparation for starting the steam turbine 48.

[0085] This disclosure In, Steam turbine system 16 in Zone 2 Returning to online Then, the output power of the steam turbine system 16 is, Block load This will contribute to supporting it. Therefore, steaming Taking into account the load added by the turbine system 16, Reduce the load on the gas turbine system 14. That's fine.

[0086] Embodiments of the present disclosure are of a gas turbine system 14 Load reduction This includes, but the gas turbine system 14 Load reduction is , steam turbine system 16 of load driving to As a result , Gas turbine system 14 load Unable to drive reverse To the new train Charge It ends up Up to, from gas turbine system 14 The reduction in load should not become too large. This also includes doing so. Furthermore, in Zone 2, this disclosure In, Power grid 144 to Gas turbine system 14 Power supply reduction By controlling That auxiliary load of combined cycle power plants against support but Loss break up to a certain extent No reduction in power supply from the gas turbine system 14 to the power grid 144 occurs. Controlled in this way be Therefore, this disclosure In, Zone 1: Gas turbine system 14 in an appropriate number Block loadBy accepting this, power grid 144 in Zone 2 to Gas turbine system 14 Power supply reduction excessive And so Furthermore, the combined cycle power plant 10 Bad for driving To avoid causing any impact collateral It is possible.

[0087] Zone 2 enter The gas turbine system 14 is as disclosed in this disclosure. In this case, how many Absorb that load block doing In addition, the power grid 144 In some cases, block power supply is being provided. Depending on the thermal state of the steam turbine system 16, the combined cycle power plant 10 will power the power grid 144 Additional blocks Therefore, it is generating a very large load. thing There is a gas turbine system 14 of the combined cycle power plant 10. Power generation Adjust the amount ,and Exhaust gas 44 Temperature , steam turbine system 16 Occurs Temperature compatibility conditions Adjust according to do .

[0088] Zone 3 is especially Warming up of a combined cycle power plant and hot operation For the purpose of "uncontrolled Limited It is characterized by the load. However, in the thermal state of a combined cycle power plant at low temperatures, the steam turbine system 16 is susceptible to stress. Therefore, Power grid 144 Compared to the amount of power supplied to Taking a wide time interval is beneficial. There is Both the gas turbine system 14 and the steam turbine system 16 are in Zone 3. Online Then, gas turbine system 14 and Steam turbine system 16 and Binding inertia by Grid 144 Block power supply Low-speed droop Light Because it can be reduced, the power grid 144 Power supply in response block It can be made larger ru.

[0089] This specification and the claims Approximate representation used are, It is a modifier of quantity, and that quantity is concerning Person in charge the basic functions that bring about changes Within acceptable limits variations Applied to represent the possible quantity . Therefore, Words like "approximately," "abbreviated," and "essentially" the term in modified values are Not limited to those precise figures . In some cases, Approximation expression is the corresponding to the accuracy of the device for measuring values do . Book This specification and the claims In , Numerical ranges are combinable and / or interchangeable. being, Unless otherwise clarified from the context, the scope of such use is... within the range Identify and encompass all included sub-scopes. . For specific values within the range Used "about" is Upper and lower limits applied to the the accuracy of the device for measuring values Except when it depends on, of the recited numerical value ± indicating 10% a .

[0090] The following claims Configuration identified by functional description elements of corresponding structures, materials, act and equivalents are The claims are specifically described other composition when combined with elements Every function structures, materials also are Includes the act . The present disclosure description is for illustration and explanation Its purpose is , not comprehensive Unless it's something else , Disclosed not limited to But any form Book The scope of the disclosure technical and technical thought deviating from Without doing so, many modifications Masanori and variations This would be obvious to those skilled in the art. . The embodiments of this disclosure are, The principles and Practical uses This description is selected and presented in a manner that is most appropriate for explaining various embodiments and allows those skilled in the art to understand the disclosures regarding various embodiments and various modifications suitable for specific uses. of the present disclosure

Explanation of reference numerals

[0091] 1 zone 2 zones 3 Zones 10 Combined cycle power plants 12 controllers 14 Gas Turbine Systems 16 Steam Turbine System 20 Airflow control modules, airflow control devices 22 Compressor 24 Combustor 26 Gas Turbine 28. Air, oxidizing agent 30 Low Knotweed Disc 32 Fuel 34 Fuel Nozzle 36 Exhaust vents 38 Turby Nro - Knotweed Disc 40 shaft 42 Generators, loads 44 Exhaust gas 46 lines 48 Steam Turbine 49 Condenser 50 shaft 52 load 54 Low Knotweed Disc 56 memory 58 processors 60 Exhaust gas temperature sensor 62 HRSG Steam Temperature Sensor 64 Steam Turbine Metal Temperature Sensor 144 Power grid

Claims

1. A method of providing load sharing to a power grid (144) in a combined cycle power plant (10), the method comprising: operating a gas turbine system (14) of the combined cycle power plant (10) in an island operation mode in which only a turning device rotates while a steam turbine system (16) of the combined cycle power plant (10) is offline (46); applying a load to the steam turbine system in accordance with a temperature compatibility condition of the steam turbine system, the step of applying a load to the steam turbine system including controlling a gas turbine exhaust gas supplied to the steam turbine system and controlling a gas turbine exhaust temperature that heats the steam turbine system to satisfy the temperature compatibility condition of the steam turbine system; controlling the gas turbine (26) exhaust includes controlling fuel (32) flow and air flow to the gas turbine system (14); operating at least one of the gas turbine system (14) or the steam turbine system (16) to provide load sharing (52) from a load (52) on at least one of the gas turbine system (14) or the steam turbine system (16) to the power grid (144); A method comprising:

2. The method of claim 1 , wherein only the gas turbine system (14) of the combined cycle power plant (10) supplies power to the power grid (144) when the gas turbine system (14) is in the islanding mode.

3. 2. The method of claim 1, wherein both the gas turbine system and the steam turbine system supply power to the power grid when the temperature compliance condition of the steam turbine system is met.

4. The method of claim 3, wherein controlling the gas turbine (26) exhaust temperature comprises controlling fuel (32) flow to the gas turbine system (14).

5. The method of claim 3, wherein controlling the gas turbine (26) exhaust temperature comprises controlling airflow to the gas turbine system (14).

6. 10. The method of claim 1, wherein the steam turbine system includes a heat recovery steam generator, the method further comprising: flowing gas turbine exhaust gases through the heat recovery steam generator of the steam turbine system; and further controlling a temperature of the gas turbine exhaust gas supplied to the heat recovery steam generator in accordance with a temperature match controlling a fuel flow rate to the gas turbine system.

7. The variable load path may include at least one of the following: controlling the airflow to the gas turbine system (14); Controlling the fuel (32) flow rate to the gas turbine system (14); or A temperature match of the gas turbine exhaust with the temperature match requirements of the steam turbine system. The method of claim 1 , wherein the method is responsive to at least one of the following:

8. 8. The method of claim 7, wherein the steam turbine system includes a heat recovery steam generator, the method further comprising: flowing gas turbine exhaust gases through the heat recovery steam generator of the steam turbine system; and further controlling a temperature of the gas turbine exhaust gas supplied to the heat recovery steam generator in accordance with a temperature match controlling a fuel flow rate to the gas turbine system.

9. 9. The method of claim 8, wherein the steam turbine system is configured to be able to shed load to the power grid in conjunction with load shedding to the power grid by the gas turbine system, and wherein load shedding to the power grid by the gas turbine system is configured to occur after a temperature compatibility condition between the gas turbine exhaust temperature and a temperature compatibility condition of the steam turbine system meets a threshold correspondence value.

10. 2. The method of claim 1, wherein the step of operating the gas turbine system in the island operation mode further comprises warming up components of the steam turbine system, and the method further comprises operating the gas turbine system at an intermediate load condition until a steam turbine of the steam turbine system begins to accelerate toward maximum speed.

11. 2. The method of claim 1, wherein the step of loading the steam turbine system continues until a steam turbine of the steam turbine system enters inlet pressure control and a temperature compatibility condition of the steam turbine system is met by the gas turbine exhaust gas.

12. 2. The method of claim 1, wherein once a temperature compatibility condition is met, the step of loading the gas turbine system and the steam turbine system continues until the loading is complete, and then load shedding from a load connected to the gas turbine system and the steam turbine system to the power grid may continue.

13. 2. The method of claim 1, wherein the step of loading the gas turbine system onto the power grid is controlled such that loading the steam turbine system does not cause the gas turbine system to unload the power grid to an extent that would impair support for auxiliary loads of the combined cycle power plant.

14. A controller (12) for load sharing to a power grid (144) in a combined cycle power plant (10), the controller (12) controlling a gas turbine system (14) of the combined cycle power plant (10) to flexibly operate the combined cycle power plant (10) and flexibly introduce loads (52) to the gas turbine system (14), the controller (12) comprising: operating the gas turbine system (14) of the combined cycle power plant (10) in an island operation mode in which only a turning gear rotates while a steam turbine system (16) of the combined cycle power plant (10) is offline (46); applying a load to the steam turbine system in accordance with a temperature compatibility condition of the steam turbine system, the step of applying a load to the steam turbine system including controlling a gas turbine exhaust gas supplied to the steam turbine system and controlling a gas turbine exhaust temperature that heats the steam turbine system to satisfy the temperature compatibility condition of the steam turbine system; controlling the gas turbine (26) exhaust includes controlling fuel (32) flow and air flow to the gas turbine system (14); operating at least one of the gas turbine system (14) or the steam turbine system (16) to provide load (52) sharing from a load (52) of at least one of the gas turbine system (14) or the steam turbine system (16) to the power grid (144); This is performed by the controller (12).

15. 15. The controller (12) of claim 14, wherein the controller (12) further manages such that when the gas turbine system (14) is in the islanding mode, only the gas turbine system (14) of the combined cycle power plant (10) supplies power to the power grid (144).

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