APS automatic start-stop control method and system of test power station verification unit

Abstract

The invention belongs to the field of unit control, and provides an APS automatic start-stop control method and system for a test power station verification unit. The APS automatic start-stop control method of the test power station verification unit comprises the steps that an APS unit start control command is received, preparation function group start operation is executed, after all preparation function groups are started, furnace sequential control, gas turbine sequential control and steam turbine sequential control commands are started in sequence, the APS unit start process is ended, and the APS unit is put into coordinated control; and receiving a shutdown control command of the APS unit, and sequentially executing sequential control commands of stopping a denitration system, stopping a steam turbine, stopping the gas turbine, stopping a vacuum shaft seal and stopping a boiler auxiliary machine after reducing the load of the gas turbine to a set load, so that the APS unit starts from the current load to stopping of a waste heat boiler and finally stopping of a condensed water system.

Description

Technical Field

[0001] The present invention belongs to the field of unit control, and in particular relates to an APS automatic start-stop control method and system for a test power station verification unit. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The development of heavy-duty gas turbine products requires long-term operational testing in test power plants to verify the overall design technology and assess the performance and reliability of the units. The design and manufacturing processes are then improved based on the test and assessment results, and the products are finally finalized. Subsequent testing is also required to improve product maturity and continuously upgrade the products.

[0004] The test power station is a key link in the development of heavy-duty gas turbines. Currently, there is a lack of a test verification system that can meet the requirements of independent development of heavy-duty gas turbines, and it is impossible to provide reliable and stable data for the development of heavy-duty gas turbines. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an APS automatic start-stop control method and system for a test power station verification unit, which can provide reliable and stable data for the development of heavy-duty gas turbines.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides an APS automatic start-stop control method for a test power station verification unit.

[0008] An APS automatic start-stop control method for a test power station verification unit, comprising:

[0009] Receive the APS unit start-up control command and execute the start-up preparation function group operation. When all preparation function groups are started, start the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands in sequence. At this point, the APS unit start-up process is completed, and the APS unit is put into coordinated control;

[0010] Receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stop the denitrification system, stop the steam turbine, stop the gas turbine, stop the vacuum shaft seal and the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally stops the condensate system.

[0011] As an implementation method, during the coordinated control process of the APS unit, it is determined whether the DCS system combined cycle control is allowed based on the status of each device of the gas turbine; if allowed, a gas turbine allowing DCS system combined cycle control signal is sent to the DCS system.

[0012] As an implementation, the process of executing the startup preparation function group operation includes:

[0013] Start the desalted water system, closed water pump, air compressor system, condensate system, auxiliary steam system, shaft seal system, vacuum system and circulating water system in sequence, and after the startup is completed, start the APS unit.

[0014] As an implementation method, the command for starting the furnace sequence control includes: starting the furnace low-pressure steam drum water supply system, starting the furnace high and medium pressure steam drum water supply systems, starting the gas turbine start-up sequence control and starting the furnace steam temperature and pressure increase system.

[0015] As an implementation method, the command for starting the gas turbine sequential control includes, in the order of execution: opening the boiler damper door, opening the high, medium and low pressure furnace side main steam valves; resetting the boiler protection trip; starting the gas turbine and connecting to the grid; and coordinating the gas turbine input.

[0016] As an implementation method, after the gas turbine startup sequence is completed, the gas turbine is controlled to accept the load increase instruction from the DCS side to meet the needs of increasing the temperature and pressure of the boiler steam.

[0017] As an implementation method, the steam turbine start-up sequence control command includes the following steps in the execution order:

[0018] Start the EH oil system;

[0019] Steam turbine rushing;

[0020] Steam turbine generator grid connection;

[0021] The steam turbine receives DCS load control, and the turbine load increases to the warm-up load for low-load warm-up;

[0022] Increase the steam turbine load to full load.

[0023] As an implementation method, to reduce the load on the combustion engine, the related auxiliary systems or equipment are stopped in the following order:

[0024] The load of the combustion engine drops to the first load threshold;

[0025] The denitrification system stops sequential control;

[0026] The gas turbine load drops to the second load threshold.

[0027] As an implementation method, the steam turbine is stopped and the related auxiliary systems or equipment are stopped in the following order:

[0028] The low-pressure bypass is switched to steam withdrawal mode;

[0029] The high and medium pressure bypass is switched to steam withdrawal mode;

[0030] Issue a command to stop the steam turbine;

[0031] Set the cooling time after the steam turbine stops. After the steam turbine cools down, the turbine will be stopped.

[0032] A second aspect of the present invention provides an APS automatic start-stop control system for a test power station verification unit.

[0033] An APS automatic start-stop control system for a test power station verification unit, comprising:

[0034] The startup control module is used to receive the APS unit startup control command and execute the startup preparation function group operation. When all preparation function groups are started, the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands are started in sequence. At this point, the APS unit startup process is completed and the APS unit is put into coordinated control;

[0035] The shutdown control module is used to receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stopping the denitrification system, stopping the steam turbine, stopping the gas turbine, stopping the vacuum shaft seal and the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally shuts down the condensate system.

[0036] The beneficial effects of the present invention are:

[0037] By coordinating the start and stop command signals and the DCS combined cycle control signal from the gas turbine, this invention enables automatic start and stop of the gas turbine without operator judgment, reducing the number of breakpoints during the APS startup process for gas-steam combined cycle units. This makes the startup process smoother and more efficient, reducing delays and errors that may be caused by manual intervention.

[0038] The automatic start and stop function of the present invention improves the automation level of gas turbine operation, which not only reduces the operating intensity of operators, but also improves the reliability and stability of the unit; through precise control systems and logical judgments, the gas turbine can be started and stopped at the best time to meet the operating requirements of the unit.

[0039] The APS system of this invention enables automatic start-up, shutdown, and operational control of the unit, significantly reducing the operator's workload during startup and shutdown. Through precise control algorithms and logical judgment, the system automatically adjusts the unit's operating parameters to ensure optimal operation.

[0040] The automatic start-stop control system of this invention monitors the operating status of the unit in real time, promptly detecting and addressing abnormalities. It can automatically stop the unit in an emergency, protecting the safety of equipment and personnel. Furthermore, by optimizing the start-up and shutdown processes, it reduces impact and wear on the equipment, thereby extending its service life.

[0041] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0043] Figure 1 This is a flow chart of an APS automatic start-stop control method for a test power station verification unit according to an embodiment of the present invention;

[0044] Figure 2 It is a structural schematic diagram of an APS automatic start-stop control system of a test power station verification unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] The whole unit test and verification system of the test power station consists of the following:

[0049] One complete test unit (e.g. 300MW F-class), capable of both single-cycle and combined-cycle operation;

[0050] Public systems and facilities, such as boiler feed water treatment system, condensate treatment system, thermal system dosing, steam-water sampling and analysis system, circulating water dosing system, industrial wastewater treatment system, hydrogen storage station, integrated water pump room, pressure regulating station, air compressor station, etc.

[0051] In one or more embodiments, Figure 1 As shown, an APS automatic start-stop control method for a test power station verification unit includes:

[0052] Step 1: Receive the APS unit startup control command and execute the startup preparation function group operation. After all preparation function groups are started, start the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands in sequence. At this point, the APS unit startup process is completed, and the APS unit is put into coordinated control.

[0053] Table 1 APS unit start-up sequence table

[0054]

[0055]

[0056] According to the APS unit startup sequence, the first step in unit startup is the APS startup preparation function group. The preparation function group starts the relevant auxiliary systems or equipment in the following order:

[0057] XS011 starts the desalination system;

[0058] XS012 starts the closed water pump;

[0059] XS013 starts the air compressor system, the circulating water system, the condensate system, and the lubricating oil system;

[0060] XS014 starts the auxiliary steam system;

[0061] XS015 starts the shaft sealing system;

[0062] XS016 starts the vacuum system.

[0063] When the desalted water pump system, closed water pump, air compressor system, condensate system, auxiliary steam system, shaft seal system, vacuum system, and circulating water system are started and the APS startup system is ready, the unit can be started.

[0064] Table 2 APS startup system preparation sequence

[0065]

[0066]

[0067] After the APS start-up preparation function group is completed, it indicates that all auxiliary system preparations are completed. The unit control system DCS can send the "Plant is ready, gas turbine start-up is allowed" command to the gas turbine control system (TCS). The gas turbine control system can detect whether the start-up preparations of each gas turbine system are completed. If the start-up conditions are met, the next step of APS start-up furnace sequence can be carried out according to the APS unit start-up sequence.

[0068] The APS start-up furnace sequence control starts the relevant systems or equipment in the following order:

[0069] XS021 starter boiler low-pressure drum water supply system;

[0070] XS022 startup furnace high and medium pressure drum water supply system;

[0071] XS023 starts the gas turbine start sequence control;

[0072] XS024 startup furnace steam temperature and pressure boosting system.

[0073] Table 3 APS start-up waste heat boiler sequential control

[0074]

[0075]

[0076] The gas turbine startup sequence is as follows:

[0077] XS031 Open the boiler damper door and open the main steam valves on the high, medium and low pressure furnace sides;

[0078] XS032 resets boiler protection trip;

[0079] XS033 gas turbine start-up and grid connection;

[0080] Coordinated commissioning of XS034 gas turbine.

[0081] After the gas turbine startup sequence is completed, the gas turbine can accept the load increase command from the DCS side to meet the needs of boiler steam temperature and pressure increase.

[0082] Table 4 APS start-up gas turbine sequence control

[0083]

[0084]

[0085] For example, if the turbine load rises to 45MW during this process and auxiliary power is not switched, the system will wait for auxiliary power to be switched, and then automatically increase the load after the auxiliary power is switched. (Turbine cold start: turbine load rises to 50MW; turbine warm start: turbine load rises to 60MW; turbine hot start: turbine load rises to 100MW; in cold state, after turbine run-up is complete, turbine load rises to 60MW; after turbine grid connection, turbine load begins to rise to 160MW after 35 minutes in cold state, 35 minutes in warm state, and 10 minutes in hot state. The load increase rate is 3.18MW / min in cold state, 4.65MW / min in warm state, and 15MW / min in hot state, reaching 160MW.

[0086] When the boiler steam temperature and pressure meet the turbine startup requirements, proceed to the next step of APS turbine startup sequence according to the APS unit startup sequence.

[0087] The APS starts the steam turbine sequential control and starts the related systems or equipment in the following order:

[0088] XS041 starts the EH oil system;

[0089] XS042 steam turbine run-up;

[0090] XS043 steam turbine generator grid connection;

[0091] The XS044 turbine receives DCS load control and the turbine load is increased to warm-up load for low-load warm-up. At this time, the turbine needs to be increased to warm-up load at different load increase rates according to the turbine's cold, warm, and hot operating conditions.

[0092] The XS045 steam turbine is increased to full load. At this time, the turbine needs to be increased to full load at different load increase rates according to the cold, warm, and hot operating conditions of the turbine.

[0093] At this point, the entire APS startup process is completed and the unit can be put into coordinated control.

[0094] Table 5 APS start-up steam turbine sequence control

[0095]

[0096]

[0097] Step 2: Receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stop the denitrification system, stop the steam turbine, stop the gas turbine, stop the vacuum shaft seal, and stop the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally stops the condensate system, as shown in Table 6.

[0098] Table 6 APS shutdown sequence control

[0099]

[0100] The stop control range of the unit's automatic start-stop control system starts from the unit's current load, ends when the waste heat boiler stops, and finally ends when the condensate system stops.

[0101] The APS shutdown sequence is as follows:

[0102] XS061 reduces the engine load and stops the denitration system when the engine load drops to a certain level;

[0103] XS062 stops the steam turbine;

[0104] XS063 stops the combustion engine;

[0105] XS064 stops the vacuum shaft seal and boiler auxiliary equipment.

[0106] According to the APS shutdown sequence, the first step in unit shutdown is to reduce the gas turbine load. To reduce the gas turbine load, stop the relevant auxiliary systems or equipment in the following order:

[0107] The XS071 gas turbine load was reduced to 150MW;

[0108] XS072 denitrification system stops sequential control;

[0109] The XS073 gas turbine load dropped to 120MW.

[0110] As the load of the gas turbine decreases, the saturated steam generated by the waste heat boiler gradually decreases. At this time, the load of the steam turbine also decreases. According to the load of the steam turbine, the APS shutdown sequence starts to execute the second step to stop the steam turbine. When stopping the steam turbine, the relevant auxiliary systems or equipment are stopped in the following order:

[0111] XS081 low-pressure bypass switches to steam withdrawal mode;

[0112] The XS082 high and medium pressure bypass is switched to steam withdrawal mode;

[0113] XS083 issues a command to stop the steam turbine.

[0114] After the steam turbine stops, it needs to cool down for a period of time. After the steam turbine cools down, the APS shutdown sequence starts to execute the third step to stop the gas turbine. When stopping the gas turbine, the related auxiliary systems or equipment should be stopped in the following order:

[0115] The XS091 APS is waiting for the gas turbine to be shut down. Before shutting down the gas turbine, the operator needs to determine whether to shut down the gas turbine based on the unit's equipment operating conditions and the external grid dispatch requirements. If necessary, the operator will issue a shut-down command at the gas turbine operator station to avoid unnecessary shutdowns.

[0116] This step requires a lot of participation from operating personnel. In order to reduce the workload of operating personnel and improve the level of automation, a communication signal is added from the unit DCS to the gas turbine control system in this process to distinguish the reasons for stopping the gas turbine. The gas turbine then executes different gas turbine stop sequences according to different instructions. While reducing the workload of operating personnel, the number of gas turbine shutdowns is minimized, thereby reducing the possibility of shortening the life of the first domestically produced 300MW gas turbine due to the number of unit starts and stops.

[0117] XS092 closes the high-pressure main steam door and bypass door on the boiler side; closes the medium-pressure main steam door on the boiler side; closes the low-pressure main steam door on the boiler side.

[0118] After the gas turbine stops, the next load-carrying time needs to be determined according to the external grid dispatching requirements. If the load is not required within a short period of time, the operator can execute the fourth step of the APS shutdown sequence to stop the vacuum shaft seal and boiler auxiliary equipment, and stop the relevant auxiliary systems or equipment in the following order:

[0119] XS010 opens the vacuum breaking valve;

[0120] XS020 shaft sealing system;

[0121] XS030 stops the boiler auxiliary equipment.

[0122] During the APS startup process, the start of the gas turbine typically requires setting a breakpoint, with the operator confirming and then issuing a gas turbine start signal. However, to meet the requirements of the test and verification of the APS start and shutdown of the first domestically produced 300MW gas-steam combined cycle unit, three important signals were added: the "gas turbine allows DCS combined cycle control (APS mode)" signal, the "DCS start gas turbine command" signal, and the "DCS stop gas turbine command" signal, greatly improving the automation level of gas turbine operation.

[0123] The "Gas Turbine Allows DCS Combined Cycle Control (APS Mode)" signal determines whether DCS combined cycle control is permitted based on the status of the various components of the gas turbine. If permitted, this signal is sent to the DCS. This signal provides the DCS with a basis for determining whether automatic start or stop of the gas turbine can be performed. It ensures that the gas turbine is in a suitable state for combined cycle control during automatic control.

[0124] "DCS Start Turbine Command" signal: After receiving the "Turbine Enables DCS Combined Cycle Control (APS Mode)" signal, the DCS issues this command based on APS logic requirements. When the system determines that the turbine needs to be started, this command automatically starts the turbine without manual intervention by the operator. This improves the efficiency and automation of the startup process.

[0125] "DCS Stop Turbine" signal: Similarly, after receiving the "Turbine Enables DCS Combined Cycle Control (APS Mode)" signal, the DCS issues this command based on APS logic requirements. This command automatically stops the turbine when the system needs to, reducing the risk and uncertainty of manual operation.

[0126] The main control logic of the APS system in this embodiment of the present invention controls the plant-wide APS. Its primary interfaces with other systems include the island APS and the DEH. The interface with the island APS primarily issues start and stop commands to the island systems. During APS startup, the DEH automatically receives commands from the APS to automatically complete turbine shutdown, speed increase, warm-up, valve switching, rated speed, initial load, and load increase.

[0127] Categorizing the DCS shutdown engine signals according to different tripping conditions helps to take appropriate measures promptly and accurately in various abnormal situations, ensuring the safety of the unit and the smooth progress of test verification.

[0128] The classified engine shutdown signals between the DCS and the engine control system are shown in Table 7 below:

[0129] Table 7 Classified engine shutdown signals between DCS and engine control system

[0130]

[0131]

[0132] Among them, the DCS to RB signal:

[0133] Normal load reduction: This signal is a switching signal and is issued when the DCS detects a need for normal load reduction. During unit operation, normal load adjustment may be necessary due to changes in grid demand, equipment maintenance, and other reasons. In these cases, the DCS issues an RB signal, causing the gas turbine to reduce its load according to a predetermined procedure to ensure stable unit operation.

[0134] Rapid load reduction: This signal is also a switching signal. The DCS issues this signal when an emergency requires rapid load reduction. For example, a sudden grid failure or a serious anomaly within a unit requires rapid load reduction to avoid further losses.

[0135] Gas turbine load shedding signals: Gas turbine load shedding 1, 2, and 3: These three switching signals indicate that the gas turbine is in a load shedding state. When the DCS receives these three signals, it indicates that the gas turbine is rapidly adjusting its operating state to adapt to the new operating conditions. At this time, the DCS load increase command is blocked, and the gas turbine can no longer receive load increase signals, ensuring the safety of the gas turbine.

[0136] Steam-water cycle interlock signal for no engine shutdown: Steam-water cycle interlock signal for no engine shutdown 1, 2, and 3 (from DCS): In a combined gas-steam cycle unit, the steam-water cycle system and the engine are closely linked. Abnormalities in the steam-water cycle system may affect engine operation. These signals ensure that problems with the steam-water cycle system do not cause unexpected engine shutdowns. They also provide operators with important information about the relationship between the steam-water cycle system and the engine.

[0137] Waste Heat Generator (HRSG) Interlock Signals: HRSG Interlock Signals (1, 2, and 3) (from the DCS): The HRSG is a critical component of a gas-steam combined cycle unit. It uses the high-temperature exhaust gas from the gas turbine to generate steam, which drives the steam turbine for power generation. These switching signals indicate the interlock relationship between the HRSG and the gas turbine. When a HRSG fault or abnormality occurs, these signals ensure that the gas turbine is not shut down inadvertently. They also provide operators with status information on the coordinated operation of the HRSG and the gas turbine.

[0138] Gas turbine trip signal:

[0139] Turbine trip 1, 2, 3: These switching signals indicate a serious turbine failure requiring immediate shutdown. When these signals are detected, the DCS quickly implements appropriate protective measures to prevent further escalation of the fault and protect the unit's equipment.

[0140] DCS gas turbine fault load reduction / shutdown signal:

[0141] DCS sends engine failure load reduction signals 1, 2, and 3: When TCS receives these signals, the engine will quickly drop to 0 load.

[0142] DCS sends engine fault shutdown signals 1, 2, and 3: When TCS receives these signals, the engine will quickly drop to 0 speed.

[0143] For gas turbines using constant initial turbine temperature regulation, the exhaust temperature fluctuates with unit load during startup. Initially, as the load gradually increases, the exhaust temperature rises and then decreases. This temperature fluctuation can cause thermal stress on the turbine's hot components, such as the combustion chamber and turbine blades. Frequent and prolonged thermal stress fluctuations can lead to thermal fatigue, thus shortening the equipment's lifespan. Furthermore, during startup, the exhaust flow rate of the gas turbine gradually increases. This flow rate fluctuation can impact downstream equipment, such as the exhaust piping and waste heat boiler. Excessively rapid changes in exhaust flow rate can cause piping vibration and loose connections, impacting equipment reliability and lifespan. Frequent starts and stops, or even emergency shutdowns, during unit startup inevitably shorten the turbine's lifespan. Adding a DCS to signal load shedding / shutdown in the event of a turbine fault can minimize this impact on the turbine's lifespan, thereby ensuring the safe operation of China's first domestically produced 300MW gas-steam combined cycle unit while minimizing the impact on the turbine's lifespan.

[0144] Gas turbine fault load reduction / shutdown signal:

[0145] Gas turbine fault load reduction 1, 2, 3: When the DCS receives these signals, it means that the gas turbine has been reduced to 0 load, but the gas turbine is still running at rated speed. At this time, the DCS can determine whether further shutdown or load increase is required based on the unit operating conditions, thereby reducing the number of unit starts and stops.

[0146] Gas turbine fault shutdown 1, 2, 3: When the DCS receives these signals, it means that the gas turbine has dropped to 0 speed.

[0147] In summary, the detailed classification of DCS shutdown signals is crucial for meeting the requirements for testing and safe operation of the first domestically produced 300MW gas-steam combined cycle unit. These signals allow operators to promptly understand the unit's operating status, accurately identify any abnormalities, and take appropriate measures to ensure safe and stable operation.

[0148] The control of the test unit and the conventional combined cycle unit mainly differs as follows:

[0149] (1) The combined cycle control system of the test unit needs to consider matching with the control of the whole unit test verification unit.

[0150] (2) The whole machine test verifies the startup matching between the unit, steam turbine and waste heat boiler.

[0151] Table 8 Communication signals between DCS and gas turbine control system

[0152]

[0153]

[0154]

[0155] In one or more embodiments, Figure 2 As shown, an APS automatic start-stop control system for a test power station verification unit is also provided, including:

[0156] The startup control module is used to receive the APS unit startup control command and execute the startup preparation function group operation. When all preparation function groups are started, the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands are started in sequence. At this point, the APS unit startup process is completed and the APS unit is put into coordinated control;

[0157] The shutdown control module is used to receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stopping the denitrification system, stopping the steam turbine, stopping the gas turbine, stopping the vacuum shaft seal and the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally shuts down the condensate system.

[0158] It should be noted here that the various modules in the APS automatic start-stop control system of the test power station verification unit in the embodiment of the present invention correspond one-to-one to the various steps in the APS automatic start-stop control method of the above-mentioned test power station verification unit, and the specific implementation process is the same, which will not be described in detail here.

[0159] By adding three signals—"gas turbine permitted DCS combined cycle control (APS mode)"; "DCS gas turbine start command"; and "DCS gas turbine stop command"—this invention enables automatic gas turbine start and stop during APS startup in a gas-steam combined cycle unit, improving automation and operational safety reliability. This is of great significance for the test verification and future practical application of China's first domestically produced 300MW gas-steam combined cycle unit.

[0160] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for automatically starting and stopping an APS for verifying a unit in a test power station, characterized in that: include: Receive the APS unit start-up control command and execute the start-up preparation function group operation. When all preparation function groups are started, start the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands in sequence. At this point, the APS unit start-up process is completed, and the APS unit is put into coordinated control; Receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stop the denitrification system, stop the steam turbine, stop the gas turbine, stop the vacuum shaft seal and the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally stops the condensate system.

2. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: During the coordinated control process of the APS unit, whether the DCS system combined cycle control is allowed is determined based on the status of each device of the gas turbine; if allowed, a gas turbine allowing DCS system combined cycle control signal is sent to the DCS system.

3. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: The process of executing the startup preparation function group operation includes: Start the desalted water system, closed water pump, air compressor system, condensate system, auxiliary steam system, shaft seal system, vacuum system and circulating water system in sequence, and after the startup is completed, start the APS unit.

4. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: The commands for starting the boiler sequence control include: starting the boiler low-pressure steam drum water supply system, starting the furnace high and medium pressure steam drum water supply systems, starting the gas turbine start sequence control and starting the boiler steam temperature and pressure increase system.

5. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: The commands for starting the gas turbine sequential control include, in order of execution: opening the boiler damper door, opening the high, medium and low pressure furnace side main steam valves; resetting the boiler protection trip; starting the gas turbine and connecting it to the grid; and coordinating the gas turbine input.

6. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: After the gas turbine startup sequence is completed, the gas turbine is controlled to accept the load increase instruction from the DCS side to meet the needs of boiler steam temperature and pressure increase.

7. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: The steam turbine start-up sequence control commands include: Start the EH oil system; Steam turbine rushing; Steam turbine generator grid connection; The steam turbine receives DCS load control, and the turbine load increases to the warm-up load for low-load warm-up; Increase the steam turbine load to full load.

8. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: To reduce the engine load, stop the related auxiliary systems or equipment in the following order: The load of the combustion engine drops to the first load threshold; The denitrification system stops sequential control; The gas turbine load drops to the second load threshold.

9. The APS automatic start-stop control method for a test power plant verification unit according to claim 1, characterized in that: When stopping the steam turbine, stop the related auxiliary systems or equipment in the following order: The low-pressure bypass is switched to steam withdrawal mode; The high and medium pressure bypass is switched to steam withdrawal mode; Issue a command to stop the steam turbine; Set the cooling time after the steam turbine stops. After the steam turbine cools down, the turbine will be stopped.

10. An APS automatic start-stop control system for a test power station verification unit, characterized in that: include: The startup control module is used to receive the APS unit startup control command and execute the startup preparation function group operation. When all preparation function groups are started, the furnace sequence control, gas turbine sequence control and steam turbine sequence control commands are started in sequence. At this point, the APS unit startup process is completed and the APS unit is put into coordinated control; The shutdown control module is used to receive the APS unit shutdown control command, and execute the sequential control commands of reducing the gas turbine load to the set load, then stopping the denitrification system, stopping the steam turbine, stopping the gas turbine, stopping the vacuum shaft seal and the boiler auxiliary equipment, so that the APS unit starts from the current load to stop the waste heat boiler and finally shuts down the condensate system.

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