A Smart Start-up Control Method for Two-on-One Gas-Steam Combined Cycle Units

Abstract

This invention discloses an intelligent selection method for the start-up control of a two-on-one gas-fired combined cycle turbine unit. This method pre-sets the start-up mode of the two-on-one gas-fired combined cycle unit to directly and sequentially achieve the unit start-up preparation stage, gas turbine start-up stage, steam turbine start-up stage, grid connection stage, and unit load increase stage. It also pre-sets the shutdown mode of the two-on-one gas-fired combined cycle unit to directly and sequentially achieve the reduction of gas turbine load, shutdown of the denitrification system, withdrawal of steam from one pre-selected boiler, and shutdown of the corresponding gas turbine, steam turbine, and auxiliary systems. This invention represents a further upgrade and improvement in the start-up and operation control of two-on-one gas-fired combined cycle turbine units.

Description

Technical Field

[0001] This invention belongs to the field of intelligent control of two-to-one gas-fired steam combined cycle units, specifically relating to an intelligent selection method for start-up and shutdown control of two-to-one gas-fired steam combined cycle units. Background Technology

[0002] To meet the requirements of efficient and flexible start-up of two-to-one gas-fired combined cycle units, experts and scholars have conducted extensive research and exploration. The unit's automatic start-up and shutdown control system starts and stops the two-to-one gas-fired combined cycle unit according to the distributed control system program, which can effectively shorten the start-up and shutdown time of the unit and reduce the probability of human error. Therefore, it is essential to study the implementation plan of the combined cycle APS (Automatic Plant Start-up and Shutdown System), solve the key start-up technologies under multiple modes, and master the core control concept of APS for the rapid start-up and shutdown and safe and economical operation of the unit. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an intelligent start-up and shutdown control method for a two-to-one gas-steam combined cycle unit.

[0004] This invention is achieved using the following technical solution:

[0005] A method for intelligently selecting the start-up control of a two-to-one gas-fired steam combined cycle unit is disclosed. This method directly realizes the unit start-up preparation stage, gas turbine start-up stage, steam turbine start-up stage, grid connection stage, and unit load increase stage by pre-setting the start-up mode of the two-to-one gas-fired steam combined cycle unit. The method also directly realizes the reduction of gas turbine load, shutdown of the denitrification system, withdrawal of steam from one pre-selected boiler, shutdown of the corresponding gas turbine, shutdown of the steam turbine, and shutdown of the auxiliary system by pre-setting the shutdown mode of the two-to-one gas-fired steam combined cycle unit.

[0006] A further improvement of the present invention is that the method specifically includes the following steps:

[0007] 1) Operators manually click to confirm the "Intelligent Selection of Two-on-One Gas-Steam Combined Cycle Unit Start-up Control" function;

[0008] 2) Operators should select "one-to-one" or "two-to-one" startup in advance, select the single unit to be started first, and pre-select whether to start in "APS mode" throughout the process. In "non-APS mode", a single startup program or several related system startup programs can be started manually.

[0009] 3) Operators manually pre-select the auxiliary equipment to be started, including: pre-selection of waste heat boiler for Unit 1, pre-selection of waste heat boiler for Unit 2, and pre-selection of steam turbine and utility equipment;

[0010] 4) 1# HRSG pre-selection includes: 1# MP feed water pump pre-selection, 1# MP feed water pump pre-selection and 1# LP recirculation pump pre-selection;

[0011] 5) 2# HRSG pre-selection includes: 2# MP feed water pump pre-selection, 2# MP feed water pump pre-selection and 2# LP recirculation pump pre-selection;

[0012] 6) Turbine and utility pre-selection includes: circulating water large pump pre-selection, seal oil pump pre-selection, start-up boiler feed water pump pre-selection, circulating water small pump pre-selection, exhaust gas fan pre-selection, condensate pump pre-selection, open water pump pre-selection, desalination water pump pre-selection, condensate water pump pre-selection, closed water pump pre-selection, closed water heat exchanger pre-selection, vacuum pump pre-selection, cooling tower fan water inlet valve pre-selection, cooling tower bypass door pre-selection, circulating pump cooling water pump pre-selection, gas turbine sequence control pre-selection;

[0013] 7) The operation personnel confirm in advance whether it is "non-APS mode start" or "APS mode start", if "non-APS mode start" is selected, the operation personnel will start the single system module according to the actual situation on site, use the boiler start sequence control program, manually click "start the boiler" to start according to the pre-selected program, if the judgment condition set in the start program is met, the program will not run to ensure the safety of the equipment; when the start program of the start boiler is fully met, except that the desalination water pressure is normal, the closed water pressure is normal, and the start boiler is in the fire extinguishing state, the program can be successfully executed, and the start operation method of the remaining system equipment is operated according to the "start boiler" program.

[0014] The further improvement of the present application is that in the "non-APS mode start", the "start boiler" program comprises: the first step, closing the pipeline water supply and the main steam door opening the drain door, if the water supply pipeline valve is closed, the economizer and the superheater drain valve is opened, the main steam door and the superheater drain valve is opened, the start boiler inlet and return valve is opened; the second step, opening the economizer water inlet door, if the economizer water inlet door is emptied; the third step, closing the economizer drain door, if the economizer drain door is closed, the water-cooled wall header drain door is closed; the fourth step, the deaerator water inlet adjusting door is put into automatic, if the deaerator water inlet valve is put into automatic, the deaerator liquid level is normal; the fifth step, starting the pre-selected water supply pump, if any water supply pump meets the operation; the sixth step, opening the running water supply pump outlet electric door, if any water supply pump runs and the outlet door is opened; the seventh step, the water supply pump is put into the standby water supply adjusting door and put into the automatic state, if the water supply pump standby instruction is sent for 5 seconds, the water supply electric adjusting door is put into the automatic state; the eighth step, closing the drum accident water supply door and opening the drum surface blowdown door, if the boiler drum water level is normal, the drum emergency water electric door is closed, the drum surface blowdown electric door is opened; the ninth step, resetting the burner and MFT, and opening the gas outlet valve, if the MFT is reset, the natural gas to the start-up furnace outlet valve is opened; the tenth step, starting the boiler burner and heater, if the burner has fire for 180 seconds, the furnace wind pressure is normal, and the start-up furnace heater has no fault; the eleventh step, closing the drain door and the desuperheating water inlet door, if the drain door is closed, the desuperheating water electric adjusting door is put into the automatic state, and the superheater outlet steam pressure is greater than 0.1 MPa; the twelfth step, opening the deaerator steam inlet adjusting door and the electric door, if the deaerator steam inlet adjusting door is opened, and the deaerator steam inlet adjusting door is put into the automatic state; the thirteenth step, closing the main steam and the superheater drain door, if the main steam drain valve electric door is closed, the superheater drain electric door is closed, and the superheater outlet steam pressure is greater than 0.15 MPa; the fourteenth step, putting into the combustion load regulation automatic, any water supply pump runs, the water supply electric adjusting door is put into the automatic state, the burner has fire, the burner ratio adjusting instrument is put into the automatic state, the superheater outlet steam pressure is greater than 0.3 MPa, and the superheater outlet steam temperature is greater than 150℃.

[0015] The further improvement of the present application is that in the second step, the economizer water inlet door is opened, and if the economizer water inlet door is emptied for 100 seconds.

[0016] The further improvement of the present application is that in the fourteenth step, when the combustion load regulation automatic is put into, the set value is 0.8 MPa, and the delay time is 3600 s.

[0017] The further improvement of the present application is that if the "APS mode start" is selected, the operator will first confirm the start operation conditions required by the program, including: both gas turbines are in the stop state, the steam turbine is in the pure condensing mode, the unit has selected the "APS mode start", the "APS mode start" selection is completed, all preselections of auxiliary equipment are completed, and the gas turbine sequence control selection is completed.

[0018] The further improvement of the present application is that the "APS mode start", the "APS start 1 unit sequence control" program includes: the first step, starting the second front pump condensate pump when the 2 unit gas turbine is running, if any two front pump condensate pumps are running or the 2 unit boiler is stopped; the second step, starting the 1 unit boiler low pressure steam drum water feeding system, if the 1 unit low pressure steam drum water feeding is completed; the third step, starting the 1 unit boiler high pressure steam drum water feeding system, if the 1 unit boiler medium pressure steam drum water feeding is completed and the high pressure steam drum water feeding is completed; the fourth step, starting the 1 unit gas turbine, if the 1 unit gas turbine ignition is successful; the fifth step, starting the 1 unit boiler steam temperature and pressure raising system, the 1 unit boiler low pressure steam temperature and pressure raising is completed, the 1 unit boiler medium pressure steam temperature and pressure raising is completed, the 1 unit boiler reheat steam temperature and pressure raising is completed, and the 1 unit boiler high pressure steam temperature and pressure raising is completed.

[0019] The further improvement of the present application is that the "APS mode start", the "APS start group sequence control" program includes: the first step, starting each auxiliary system, if each auxiliary system is normal; the second step, starting the boiler water feeding and the gas turbine temperature and pressure raising, if the gas turbine is connected to the grid and the steam temperature and pressure raising is completed; the third step, starting the steam turbine warm-up, rotation and grid connection, if the APS start steam turbine is completed, and the one-to-one start is waiting for the boiler steam quality to be qualified; the fourth step, starting the boiler to start steam connection, if the steam connection is completed or the one-to-one start is completed; the fifth step, the gas turbine load is raised to 160 MW, if the running gas turbine load is greater than 155 MW for 60 seconds.

[0020] The present application has at least the following beneficial technical effects:

[0021] The intelligent selection two-to-one gas-steam combined cycle unit start control method provided by the present application realizes the intelligent selection start of the "one-to-one" or "two-to-one" mode of the gas turbine and the steam turbine in the two-to-one gas-steam combined cycle unit in the APS mode, simultaneously has the steam connection start control of the second gas turbine and the waste heat boiler based on the "one-to-one" operation mode, meets the flexible start target of the unit in multiple modes, and realizes the further upgrading and promotion of the start operation control of the two-to-one gas-steam combined cycle unit. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The flowchart of the intelligent selection two-to-one gas-steam combined cycle unit start control method of the present application.

[0023] Figure 2 Application diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present application will be described in detail with reference to the drawings. Although exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be thoroughly understood and fully conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0025] The present application provides a smart selection two-by-one gas-steam combined cycle unit start-stop control method, which directly realizes the unit start preparation stage, gas turbine start stage, steam turbine start stage, and unit load increase stage by pre-setting the start mode of the two-by-one gas-steam combined cycle unit. The pre-set stop mode of the two-by-one gas-steam combined cycle unit directly realizes the reduction of the load of the gas turbine, the stop of the denitration system, the exit of a pre-selected boiler steam, the stop of the corresponding gas turbine, the stop of the steam turbine, and the stop of the auxiliary system, so as to enable the unit to stop safely, efficiently, and stably.

[0026] The smart selection two-by-one gas-steam combined cycle unit start-stop mode selection is set for different working conditions under the current new power system situation. The smart selection start mode selection is listed, the start mode selection is manually clicked, the one-by-one or two-by-one start mode is selected, the unit to be started first is selected, and the full-process APS mode start is selected. In the non-APS mode, the operator can start the single program block mode to start the program. The smart selection stop mode selection is listed, the start mode selection is clicked, the one-by-one or two-by-one start is selected, the unit to be started first is selected, and whether the full-process APS mode start is selected. In the non-APS mode, the single program block or several associated system start program blocks can be started.

[0027] 1) The operator manually clicks to confirm the "smart selection two-by-one gas-steam combined cycle unit start control" function;

[0028] 2) The operator selects "one-by-one" or "two-by-one" start in advance, selects a single unit to be started first, and pre-selects whether to start in the full-process "APS mode". In the "non-APS mode", the single start program or several associated system start programs can be manually started.

[0029] 3) The operator manually pre-selects the auxiliary equipment to be started, including: 1# HRSG pre-selection, 2# HRSG pre-selection, turbine and utility pre-selection;

[0030] 4) 1# HRSG pre-selection includes: 1# MPFP pre-selection, 1# MPFP pre-selection, 1# LPRP pre-selection;

[0031] 5) 2# HRSG pre-selection includes: 2# MPFP pre-selection, 2# MPFP pre-selection, 2# LPRP pre-selection;

[0032] 6) Turbine and utility pre-selection includes: CWB pre-selection, seal oil pump pre-selection, BFWP pre-selection, CWSB pre-selection, SFF pre-selection, condensate pump pre-selection, OWP pre-selection, DSWP pre-selection, condensate pump pre-selection, CWP pre-selection, CWHX pre-selection, vacuum pump pre-selection, cooling tower fan inlet valve pre-selection, cooling tower bypass door pre-selection, cooling water pump pre-selection, gas turbine sequence control pre-selection;

[0033] 7) The operator confirms in advance whether it is "non-APS mode start" or "APS mode start". If the operator selects "non-APS mode start", the operator will start the individual system module according to the actual situation on site, such as using only the furnace start sequence control program. If the operator manually clicks "start the boiler", the program will be started according to the pre-selected program. If the judgment condition set in the start program is met, the program will not run to ensure the safety of the equipment. When the start program of the start boiler is fully met, except that the salt water pressure is normal, the closed water pressure is normal, and the start boiler is in the fire extinguishing state, the program can be successfully executed. The start operation method of the remaining system equipment is the same as that of the "start boiler" program;

[0034] 8) In the "non-APS mode start", the "start boiler" program includes: first, close the pipeline water supply and the main steam door open drain valve, if the water supply pipeline valve is closed, the economizer and superheater drain valve is opened, the main steam door and the superheater drain valve is opened, the start boiler inlet and return valve is opened; second, open the economizer inlet valve, if the economizer inlet valve is opened for 100 seconds, the exhaust is completed; third, close the economizer exhaust door, if the economizer exhaust door is fully closed, the water-cooled wall header exhaust door is fully closed; fourth, the deaerator inlet valve is automatically put into, if the deaerator inlet valve is automatically put into, the deaerator liquid level is normal; fifth, start the pre-selected feed water pump, if any feed water pump meets the operation; sixth, open the running feed water pump outlet electric door, if any feed water pump is running and the outlet door is opened; seventh, the feed water pump is put into standby water supply valve and the automatic state, if the feed water pump standby command is sent with a delay of 5 seconds, the feed water electric valve is put into the automatic state; eighth, close the drum accident feed water door and open the drum surface blowdown door, if the boiler drum water level is normal, the drum emergency drain electric door is closed, the drum surface blowdown electric door is opened; ninth, reset the burner and MFT, and open the gas outlet valve, if the MFT is reset, the natural gas to the start-up furnace outlet valve is opened; tenth, start the boiler burner and heater, if the burner has fire for 180 seconds, the furnace wind pressure is normal, and the start-up furnace heater has no fault; eleventh, close the exhaust door and the desuperheating automatic, if the exhaust door is closed, the desuperheating electric valve is put into the automatic, and the superheater outlet steam pressure is greater than 0.1 MPa; twelfth, open the deaerator inlet valve and the electric door, if the deaerator inlet valve is opened, the deaerator inlet valve is put into the automatic; thirteenth, close the main steam and superheater drain door, if the main steam drain valve electric door is closed, the superheater drain electric door is closed, and the superheater outlet steam pressure is greater than 0.15 MPa; fourteenth, put into the automatic combustion load regulation, the set value is 0.8 MPa, the delay is 3600 s, any feed water pump is running, the feed water electric valve is put into the automatic, the burner has fire, the burner ratio instrument is put into the automatic, the superheater outlet steam pressure is greater than 0.3 MPa, and the superheater outlet steam temperature is greater than 150℃;

[0035] 9) If the "APS mode start" is selected, the operator will first confirm that the start-up operation conditions required by the program are met, including: both gas turbines are in a stopped state, the steam turbine is in a pure condensing mode, the unit has selected "APS mode start", the "APS mode start" selection is completed, all pre-selection of auxiliary equipment is completed, and the gas turbine sequence control selection is completed;

[0036] 10) "APS mode start", "APS start 1 unit sequence control" program includes: first step, start the second pre-pump condenser when the 2 unit gas turbine runs, if any two pre-pump condensers run or 2 unit boiler stops; Second step, start 1 unit boiler low pressure drum water system, if 1 unit low pressure drum water is completed; Third step, start 1 unit boiler high pressure drum water system, if 1 unit boiler medium pressure drum water is completed and high pressure drum water is completed; Fourth step, start 1 unit gas turbine, if 1 unit gas turbine ignition is successful; Fifth step, start 1 unit boiler steam temperature and pressure rising system, 1 unit boiler low pressure steam temperature and pressure rising is completed, 1 unit boiler medium pressure steam temperature and pressure rising is completed, 1 unit boiler reheat steam temperature and pressure rising is completed, 1 unit boiler high pressure steam temperature and pressure rising is completed;

[0037] 11) "APS mode start", "APS start group sequence control" program includes: first step, start each auxiliary system, if each auxiliary system is normal; Second step, start boiler water and gas turbine temperature and pressure rising, if gas turbine is connected to the grid and steam temperature and pressure rising is completed; Third step, start turbine warm-up, rotation and grid connection, if APS start turbine is completed, one-to-one start waits for boiler steam quality to be qualified; Fourth step, start boiler to start steam, if steam is completed or one-to-one start is completed; Fifth step, gas turbine load to 160MW, if the running gas turbine load is greater than 155MW for 60 seconds.

[0038] The present application can realize intelligent selection of two-to-one gas-steam combined cycle unit start; the gas turbine and the steam turbine are started in one-to-one or two-to-one mode by APS mode, and the second gas turbine and the waste heat boiler are started in parallel.

[0039] As shown in Figure 2 , the embodiment realizes stable and safe start of the unit by using the present application.

[0040] Although the present application has been described in detail in the foregoing description and specific embodiments, modifications and improvements thereto will be apparent to those skilled in the art. Therefore, all such modifications and improvements are intended to fall within the scope of the present application.

Claims

1. A method for intelligent selection of a two-on-one gas-steam combined cycle unit start-up control, characterized in that, The method directly realizes the unit start preparation stage, the gas turbine start stage, the steam turbine start stage, and the unit load increase stage by pre-setting the start mode of the two-by-one gas-steam combined cycle unit. The method directly realizes the load reduction of the gas turbine, the stop of the denitration system, the exit of the steam of a pre-selected boiler, the stop of the corresponding gas turbine, the stop of the steam turbine, and the stop of the auxiliary system by pre-setting the stop mode of the two-by-one gas-steam combined cycle unit. The method specifically comprises the following steps: 1) The operator manually clicks to confirm the "intelligent selection of two-by-one gas-steam combined cycle unit start control" function; 2) The operator selects "one-by-one" or "two-by-one" start in advance, selects the single unit to start first, and pre-selects whether to start in the "APS mode" throughout. In the "non-APS mode", the single start program or several associated system start programs can be started manually; 3) The operator manually pre-selects the auxiliary equipment to start, including: No. 1 waste heat boiler pre-selection, No. 2 waste heat boiler pre-selection, and steam turbine and public equipment pre-selection; 4) No. 1 waste heat boiler pre-selection includes: No. 1 medium-pressure feed water pump pre-selection, No. 1 medium-pressure feed water pump pre-selection, and No. 1 low-pressure recirculation pump pre-selection; 5) No. 2 waste heat boiler pre-selection includes: No. 2 medium-pressure feed water pump pre-selection, No. 2 medium-pressure feed water pump pre-selection, and No. 2 low-pressure recirculation pump pre-selection; 6) Steam turbine and public equipment pre-selection includes: circulating water large pump pre-selection, sealing oil pump pre-selection, start-up boiler feed water pump pre-selection, circulating water small pump pre-selection, exhaust gas fan pre-selection, condenser pre-pump pre-selection, open water pump pre-selection, desalination water pump pre-selection, condensate water pump pre-selection, closed water pump pre-selection, closed water heat exchanger pre-selection, vacuum pump pre-selection, cooling tower fan water inlet valve pre-selection, cooling tower bypass door pre-selection, circulating pump cooling water pump pre-selection, and gas turbine sequence control pre-selection; 7) The operator confirms whether to start in the "non-APS mode" or the "APS mode" in advance. If the "non-APS mode" is selected, the operator will start the single system module according to the actual situation on site, use the furnace start sequence control program, manually click "start the furnace", and then start according to the pre-selected program. If the judgment condition set in the start program is met, the program will not be run to ensure the safety of the equipment. When the start program of the start-up boiler is fully met, the desalination water pressure is normal, the closed water pressure is normal, the start-up boiler is in the fire extinguishing state, the program can be successfully executed, and the start operation method of the remaining system equipment is the same as that of the "start the furnace" program. If the "APS mode" is selected, the operator will first confirm the start operation conditions required by the program, including: both gas turbines are in the stop state, the steam turbine is in the pure condensing mode, the unit has selected the "APS mode" start, the "APS mode" start is completed, all pre-selection of the auxiliary equipment is completed, and the gas turbine sequence control is completed.

2. The intelligent selection two-by-one gas-steam combined cycle unit startup control method according to claim 1, characterized in that, In the "non-APS mode start", the "start boiler" program includes: first, close the pipeline water and main steam door open drain valve, if the water supply pipeline valve is closed, economizer and superheater exhaust valve is opened, main steam valve and superheater drain valve is opened, start boiler inlet and return valve is opened; second, open the economizer inlet valve, if the economizer inlet valve is empty; third, close the economizer exhaust door, if the economizer exhaust door is closed, water wall header exhaust door is closed; fourth, deaerator inlet valve is put into automatic, if the deaerator inlet valve is put into automatic, deaerator liquid level is normal; fifth, start the preselected feedwater pump, if any feedwater pump meets the operation; sixth, open the running feedwater pump outlet electric door, if any feedwater pump is running and the outlet door is opened; seventh, feedwater pump is put into standby feedwater valve automatic state, if the feedwater pump standby command is delayed for 5 seconds, the feedwater electric valve is put into automatic state; eighth, close the drum accident feedwater door and open the drum surface blowdown door, if the boiler drum water level is normal, the drum emergency drain electric door is closed, the drum surface blowdown electric door is opened; ninth, reset the burner and MFT, and open the gas outlet valve, if the MFT is reset, the natural gas to the start-up furnace outlet valve is opened; tenth, start the boiler burner and heater, if the burner has fire for 180 seconds, the furnace wind pressure is normal, and the start-up furnace heater has no fault; eleventh, close the exhaust door and reduce the temperature to put into automatic, if the exhaust door is closed, the desuperheating water electric valve is put into automatic, and the superheater outlet steam pressure is greater than 0.1 MPa; twelfth, open the deaerator inlet valve and electric door, if the deaerator inlet valve is opened, the deaerator inlet valve is put into automatic; thirteenth, close the main steam and superheater drain door, if the main steam drain valve electric door is closed, the superheater drain electric door is closed, and the superheater outlet steam pressure is greater than 0.15 MPa; fourteenth, put into automatic combustion load regulation, any feedwater pump is running, the feedwater electric valve is put into automatic, the burner has fire, the burner ratio instrument is put into automatic, the superheater outlet steam pressure is greater than 0.3 MPa, and the superheater outlet steam temperature is greater than 150℃.

3. The intelligent selection two-by-one gas-steam combined cycle unit startup control method of claim 2, wherein, In the second step, open the economizer inlet valve, if the economizer inlet valve is opened for 100 seconds to empty.

4. The intelligent selection two-by-one gas-steam combined cycle unit startup control method of claim 2, wherein, In the fourteenth step, when the automatic combustion load regulation is put into, the set value is 0.8 MPa, and the delay is 3600 s.

5. The intelligent selection two-by-one gas-steam combined cycle unit startup control method of claim 1, wherein, "APS mode start", "APS start 1 unit sequence control" program includes: first, when the 2 unit gas turbine is running, start the second pre-pump condenser, if any two pre-pump condenser is running or 2 unit boiler stop; second, start 1 unit boiler low pressure drum water system, if 1 unit low pressure drum water is completed; third, start 1 unit boiler high pressure drum water system, if 1 unit boiler medium pressure drum water is completed and high pressure drum water is completed; fourth, start 1 unit gas turbine, if 1 unit gas turbine ignition is successful; fifth, start 1 unit boiler steam temperature and pressure rising system, 1 unit boiler low pressure steam temperature and pressure rising is completed, 1 unit boiler medium pressure steam temperature and pressure rising is completed, 1 unit boiler reheat steam temperature and pressure rising is completed, 1 unit boiler high pressure steam temperature and pressure rising is completed.

6. The intelligent selection two-by-one gas-steam combined cycle unit startup control method of claim 1, wherein, "APS mode start", "APS start group sequence control" program includes: first, start each auxiliary system, if each auxiliary system is normal; second, start boiler water and gas turbine temperature and pressure rising, if gas turbine is connected to the grid and steam temperature and pressure rising is completed; third, start turbine warm-up, rotation and grid connection, if APS start turbine is completed, one-to-one start waits for boiler steam quality qualified; fourth, start boiler to start steam, if steam is completed or one-to-one start is completed; fifth, gas turbine load to 160MW, if the running gas turbine load is greater than 155MW for 60 seconds.

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