CN117148800A - Efficient starting and optimal control method for combined cycle unit based on data analysis - Google Patents
Efficient starting and optimal control method for combined cycle unit based on data analysis Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
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Abstract
The invention discloses a high-efficiency starting and optimizing control method of a combined cycle unit based on data analysis, which relates to the technical field of intelligent control of a gas-steam combined cycle unit. The invention optimizes the automatic control direction, automatic input and automatic cutting logic, system priority lifting/lowering and override control logic of each system by checking the logic diagram and the loop diagram of all control systems of the unit, thereby achieving the effects of improving the response performance of the control system to the process requirements, optimizing whether the function curve setting, signal compensation and signal filtering of each system accord with the control system and improving the stability and reliability of the control system.
Description
Technical Field
The invention relates to the technical field of intelligent control of a gas-steam combined cycle unit, in particular to a high-efficiency starting and optimal control method of a combined cycle unit based on data analysis.
Background
At present, the power grid side has higher and higher requirements on the peak shaving capacity of the in-service running unit, compared with the power supplies such as new energy, the gas power generation has the advantages of good peak shaving performance and low pollution, the increasingly remarkable requirements on the peak-valley difference of the power grid on the large-capacity unit have stronger peak shaving capacity, so the high-efficiency starting effect of the combined cycle unit is more and more remarkable, the cooperation of all systems is continuously optimized to adapt to the peak shaving requirement, the aim of meeting the requirements of quick response is fulfilled, the running efficiency of the unit is improved, and the method has important significance on the safe and stable running of the power grid.
In summary, the invention develops a high-efficiency starting and optimizing control method of a combined cycle unit based on data analysis, creates a control system for each production automatic function requirement, carries out comprehensive optimization, adjusts the control parameters of a control system P ID or increases logic optimization, and improves the stability and reliability of the control system.
Disclosure of Invention
The invention provides a high-efficiency starting and optimal control method of a combined cycle unit based on data analysis, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-efficiency starting and controlling method for the combined cycle unit based on the data analysis comprises the following steps of:
step one: collecting operation history data of a unit;
step two: developing a key technology suitable for the start-stop optimizing control of the combined cycle unit;
step three: application of a regulating valve model;
step four: starting the application of the automatic control model of the furnace;
step five: the boiler side and steam turbine side hydrophobic logic is optimized.
The technical scheme of the invention is further improved as follows: the first step comprises the steps of establishing a model for intelligent start-stop analysis, prediction and the like of the gas combined cycle unit on a large data platform in a production area by collecting operation historical data of the unit and adopting means such as large data analysis modeling, machine learning and the like according to the characteristics of a process system of the gas combined cycle unit and the characteristics of a mechanism for starting, stopping and operating the excavator unit and combining the characteristic of typical operation and maintenance of the same type of unit at home and abroad, and reducing start-stop points and human intervention.
The technical scheme of the invention is further improved as follows: the second step comprises the steps of obtaining and quantifying dynamic response characteristics of key process parameters of operation of the waste heat boiler, the gas turbine and the steam turbine and a control strategy of dynamic monitoring and self-adjustment through developing key technologies suitable for the start-stop optimizing control of the combined cycle unit, and applying a research result to a production area so as to maximally shorten the start-stop time of the unit.
The technical scheme of the invention is further improved as follows: and step three, a regulating valve model required in the step two, wherein the regulating valve model comprises a water supply electric regulating valve model, a high-pressure bypass valve model, a temperature reduction water electric regulating valve model, a coordinated control system model, a steam sealing regulating valve model, a condenser water level control model and a drainage expansion vessel water spraying electric regulating valve model.
The technical scheme of the invention is further improved as follows: the high-pressure water supply electric regulating valve model is used for improving undisturbed switching with a main way, solving the problem of large water level fluctuation in the ignition heating process, maintaining the water level of a high-pressure steam drum under various working conditions, controlling the running performance of the steam drum under extreme conditions, avoiding manual interference, improving the water level fluctuation of the medium-pressure steam drum under various working conditions, improving the running performance of the steam drum under the extreme conditions, avoiding manual interference, solving the problem of large water level fluctuation in the ignition heating process, and improving the water level fluctuation of the steam drum under various working conditions.
The technical scheme of the invention is further improved as follows: the high-pressure bypass valve model is automatically closed when the load of the gas turbine is increased by opening the regulating valve, the gas turbine is automatically opened when the load is reduced by closing the regulating valve, the control process meets the operation requirement of the gas turbine, the normal operation of the unit has the performance of throwing load (including partial throwing load working condition) to maintain the stability of the pressure of main steam, no manual intervention is needed, the temperature-reducing electric regulating valve model comprises a high-pressure one-stage temperature-reducing electric regulating valve model, a high-pressure two-stage temperature-reducing electric regulating valve model, a medium-pressure one-stage temperature-reducing electric regulating valve model and a medium-pressure two-stage temperature-reducing electric regulating valve model, and the high-pressure one-stage temperature-reducing electric regulating valve model, the medium-pressure one-stage temperature-reducing electric regulating valve model and the medium-pressure two-stage temperature-reducing electric regulating valve model are all used for improving the temperature of the high-pressure main steam under various working conditions within a set value range, especially the main air temperature is controlled under recommended parameters in the starting process, and the starting time is shortened.
The technical scheme of the invention is further improved as follows: the coordinated control system model can realize the optimization of the starting process in a cold state, a warm state and a hot state, control the relation between the margin and the lifting load of the steam turbine, and comprises a high-pressure shaft seal steam inlet regulating valve model, a medium-pressure shaft seal steam inlet regulating valve model and a low-pressure shaft seal steam inlet regulating valve model, wherein the high-pressure shaft seal steam inlet regulating valve model and the medium-pressure shaft seal steam inlet regulating valve model are used for solving the problem of large shaft seal pressure fluctuation during the starting and stopping processes when the shaft seal steam source is converted, and the low-pressure shaft seal steam inlet regulating valve model is used for solving the problem of large low-pressure shaft seal pressure fluctuation during operation.
The technical scheme of the invention is further improved as follows: the condenser water level control model is used for solving the problem of large water level fluctuation in the starting process, and the temperature-reducing water quantity can be quickly adjusted according to the temperature in the drainage expansion vessel when the drainage expansion vessel water spray electric regulating valve model is automatically thrown.
The technical scheme of the invention is further improved as follows: the fourth step comprises a steam drum water level automatic control model on the starting furnace, a steam temperature automatic control model of the superheater of the starting furnace and a steam drum pressure automatic control model on the starting furnace, wherein the steam drum water level automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate, the steam temperature automatic control model of the superheater of the starting furnace enables the superheated steam temperature automatic control to be put into operation and can normally operate, and the steam drum pressure automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate.
The technical scheme of the invention is further improved as follows: the fifth step can be performed to automatically open and close the drain valve, for example: before the air is fed into the steam turbine, accumulated water possibly existing in a pipeline of the steam turbine is drained completely.
By adopting the technical scheme, compared with the prior art, the invention has the following technical progress:
1. the invention provides a high-efficiency starting and optimal control method of a combined cycle unit based on data analysis, which optimizes the automatic control direction, automatic input and automatic cutting-off logic and system priority lifting/dropping and override control logic of each system by checking a logic diagram and a loop diagram of all control systems of the unit, thereby achieving the effects of improving the response performance of the control system to process requirements, optimizing whether function curve setting, signal compensation and signal filtering of each system accord with the control system and improving the stability and reliability of the control system.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention is further illustrated by the following examples:
example 1
As shown in FIG. 1, the invention provides a high-efficiency starting and controlling method of a combined cycle unit based on data analysis, which comprises the following steps:
step one: collecting operation history data of a unit;
step two: developing a key technology suitable for the start-stop optimizing control of the combined cycle unit;
step three: application of a regulating valve model;
step four: starting the application of the automatic control model of the furnace;
step five: optimizing the drain logic of the boiler side and the steam turbine side;
the method comprises the first step of establishing a model for intelligent start-stop analysis, prediction and the like of the gas combined cycle unit on a big data platform in a production area by collecting operation historical data of the unit and adopting big data analysis modeling, machine learning and other means according to the characteristics of a process system of the gas combined cycle unit, the second step of acquiring and quantifying dynamic response characteristics of key process parameters of operation of a waste heat boiler, a gas engine and a steam engine and a dynamic monitoring self-adjusting control strategy by developing a key technology suitable for the start-stop optimizing control of the combined cycle unit and applying a research result to the production area so as to maximally shorten the start-stop time of the unit.
In the embodiment, after each model is refined and debugged, one-key start and stop of the subsystem can be realized, the auxiliary system is started in a sequential control mode in a start preparation stage, the starting condition is reached at a higher speed, and the start preparation stage time is shortened; the performance heater operation, unit jigger, boiler water feeding, boiler starting and auxiliary steam system starting are brought into full-automatic starting ranges.
Example 2
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the third step refers to a regulating valve model required in the second step, which comprises a water supply electric regulating valve model, a high-pressure bypass valve model, a temperature reduction water electric regulating valve model, a coordination control system model, a steam sealing regulating valve model, a condenser water level control model and a drainage expansion water spraying electric regulating valve model, wherein the water supply electric regulating valve model comprises a high-pressure water supply electric regulating valve model, a high-pressure water supply bypass electric regulating valve model, a medium-pressure water supply electric regulating valve model and a low-pressure water supply electric regulating valve model, the high-pressure water supply electric regulating valve model is used for improving undisturbed switching with a main road, solving the problem that the water level fluctuation is large in the ignition heating process, maintaining the water level of a high-pressure steam drum to be stable under various working conditions, controlling the water level fluctuation of the steam drum to be low under extreme conditions without manual interference, improving the water level stability of the medium-pressure steam drum under various working conditions, controlling the water level fluctuation to be low under various working conditions, and improving the water level stability of the steam drum under various working conditions.
In this embodiment, the high-pressure water supply electric control valve model, the high-pressure water supply bypass electric control valve model, the medium-pressure water supply electric control valve model and the low-pressure water supply electric control valve model all need to operate the machine set to create extreme conditions for test and verification before use.
Example 3
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the high-pressure bypass valve model is automatically closed when the load of the steam turbine is increased by opening the regulating valve, the steam turbine is automatically opened when the load is reduced by closing the regulating valve, the control process meets the running requirement of the steam turbine, the normal running of the unit has the performance of throwing load (including partial throwing load working condition) to maintain the pressure stability of main steam, no manual intervention is needed, the temperature reduction electric regulating valve model comprises a high-pressure one-stage temperature reduction electric regulating valve model, a high-pressure two-stage temperature reduction electric regulating valve model, a middle-pressure one-stage temperature reduction electric regulating valve model, a middle-pressure two-stage temperature reduction electric regulating valve model, the high-pressure one-stage temperature reduction electric regulating valve model, the middle-pressure two-stage temperature reduction electric regulating valve model are all used for improving the temperature of the high-pressure main steam in a set value range under various working conditions, the method is characterized in that a main air temperature is controlled under recommended parameters in a starting process, starting time is shortened, a coordinated control system model can realize optimization of the starting process in a cold state, a warm state and a hot state, a relation between a steam turbine margin and a lifting load is controlled, a seal steam inlet regulating valve model comprises a high-pressure shaft seal steam inlet regulating valve model, a medium-pressure shaft seal steam inlet regulating valve model and a low-pressure shaft seal steam inlet regulating valve model, the high-pressure shaft seal steam inlet regulating valve model and the medium-pressure shaft seal steam inlet regulating valve model are used for solving the problem that shaft seal pressure fluctuation is large in a starting process and the low-pressure shaft seal pressure fluctuation is large in a running process, a condenser water level control model is used for solving the problem that water level fluctuation is large in the starting process, and the water-spraying electric regulating valve model of the drainage expansion vessel can quickly regulate the quantity of the temperature-reducing water according to the temperature in the drainage expansion vessel when the drainage expansion vessel is automatically started.
In the embodiment, the coordination control system model can improve the starting efficiency, shorten the starting time, and the condenser water level control model can improve the performance of maintaining the stable condenser water level under various working conditions, and the drainage expansion device water spray electric regulating valve model solves the problem of water vaporization caused by high drainage expansion temperature in the starting and stopping process.
Example 4
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the fourth step includes a steam drum water level automatic control model on the starting furnace, a steam temperature automatic control model on the starting furnace and a steam drum pressure automatic control model on the starting furnace, wherein the steam drum water level automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate, the steam temperature automatic control model on the starting furnace enables the superheated steam temperature automatic control to be put into operation and can normally operate, the steam drum pressure automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate, and the fifth step can automatically open and close a drain valve, for example: before the air is fed into the steam turbine, accumulated water possibly existing in a pipeline of the steam turbine is drained completely.
In the embodiment, in the starting and stopping processes of the unit in cold, warm and hot states, the control of the drum water level and the hot well water level is unnecessary to be manually intervened, the control of the drum water level and the steam temperature and pressure is more stable, and the switching process is required to be smooth (the switching from the starting water level to the running water level) without manual intervention. Automatic control objects thereof include, but are not limited to: high pressure bypass water supply regulating valve, high pressure main water supply regulating valve, water supply pump converter, well low pressure water supply regulating valve and high-middle low pressure steam pocket continuous blowdown control valve, urgent water discharge control valve etc. under cold, temperature, the start-up and the shut down in-process of hot state of unit, under the emergence common accident, like: the bypass is opened quickly, the bypass is closed quickly, the water supply pump (circulating pump and condensate pump) is switched in accidents, the unit is thrown load, the heated surface is slightly leaked, and the like, after fine adjustment of each model, the water level of the steam drum can be timely responded within a reasonable range, and accumulated water possibly existing in a pipeline of the steam turbine is firstly discharged cleanly before the air is supplied to the steam turbine, so that the vibration of the steam supply pipeline of the steam turbine can be reduced, and the safety of the steam turbine equipment is ensured.
The working principle of the high-efficiency starting and controlling method of the combined cycle unit based on data analysis is specifically described below.
As shown in figure 1, the model initially establishes a full-automatic starting configuration and a picture frame according to the period of a three-way meeting at the initial stage of unit debugging, completes the transmission of measuring points in a single trial operation stage, completes the interlocking protection of equipment and the start-stop program control of the equipment in a subsystem stage, collects the operation parameters of the equipment, tests and perfects the program control of each system of the full-automatic starting, when the full-automatic starting system is started, the system equipment and valves all act according to a preset sequence, the measuring points are accurately displayed, the regulating valve is automatically put into and set a target value, the regulation by the control parameters is stable, the interlocking action of the equipment and the valves is accurate and reliable, the stable operation of the system is assisted, after the model is debugged, each system has an independent operation function, the unit starting stage tests and perfects the program control of the full-automatic starting breakpoint system, and the system is smoothly operated when the breakpoint is started, the system is gradually put into stable operation, the operation quantity of each system is reduced, the system starting time is saved, the unit operation under different working conditions is considered, and the regulation is flexible.
The foregoing invention has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.
Claims (10)
1. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis is characterized by comprising the following steps of: the high-efficiency starting and controlling method for the combined cycle unit based on data analysis comprises the following steps of:
step one: collecting operation history data of a unit;
step two: developing a key technology suitable for the start-stop optimizing control of the combined cycle unit;
step three: application of a regulating valve model;
step four: starting the application of the automatic control model of the furnace;
step five: the boiler side and steam turbine side hydrophobic logic is optimized.
2. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis of claim 1, wherein the method comprises the following steps of: the first step comprises the steps of establishing a model for intelligent start-stop analysis, prediction and the like of the gas combined cycle unit on a large data platform in a production area by collecting operation historical data of the unit and adopting means such as large data analysis modeling, machine learning and the like according to the characteristics of a process system of the gas combined cycle unit and the characteristics of a mechanism for starting, stopping and operating the excavator unit and combining the characteristic of typical operation and maintenance of the same type of unit at home and abroad, and reducing start-stop points and human intervention.
3. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis of claim 1, wherein the method comprises the following steps of: the second step comprises the steps of obtaining and quantifying dynamic response characteristics of key process parameters of operation of the waste heat boiler, the gas turbine and the steam turbine and a control strategy of dynamic monitoring and self-adjustment through developing key technologies suitable for the start-stop optimizing control of the combined cycle unit, and applying a research result to a production area so as to maximally shorten the start-stop time of the unit.
4. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis of claim 1, wherein the method comprises the following steps of: and step three, a regulating valve model required in the step two, wherein the regulating valve model comprises a water supply electric regulating valve model, a high-pressure bypass valve model, a temperature reduction water electric regulating valve model, a coordinated control system model, a steam sealing regulating valve model, a condenser water level control model and a drainage expansion vessel water spraying electric regulating valve model.
5. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis according to claim 4, wherein the method comprises the following steps of: the high-pressure water supply electric regulating valve model is used for improving undisturbed switching with a main way, solving the problem of large water level fluctuation in the ignition heating process, maintaining the water level of a high-pressure steam drum under various working conditions, controlling the running performance of the steam drum under extreme conditions, avoiding manual interference, improving the water level fluctuation of the medium-pressure steam drum under various working conditions, improving the running performance of the steam drum under the extreme conditions, avoiding manual interference, solving the problem of large water level fluctuation in the ignition heating process, and improving the water level fluctuation of the steam drum under various working conditions.
6. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis according to claim 4, wherein the method comprises the following steps of: the high-pressure bypass valve model is automatically closed when the load of the gas turbine is increased by opening the regulating valve, the gas turbine is automatically opened when the load is reduced by closing the regulating valve, the control process meets the operation requirement of the gas turbine, the normal operation of the unit has the performance of throwing load (including partial throwing load working condition) to maintain the stability of the pressure of main steam, no manual intervention is needed, the temperature-reducing electric regulating valve model comprises a high-pressure one-stage temperature-reducing electric regulating valve model, a high-pressure two-stage temperature-reducing electric regulating valve model, a medium-pressure one-stage temperature-reducing electric regulating valve model and a medium-pressure two-stage temperature-reducing electric regulating valve model, and the high-pressure one-stage temperature-reducing electric regulating valve model, the medium-pressure one-stage temperature-reducing electric regulating valve model and the medium-pressure two-stage temperature-reducing electric regulating valve model are all used for improving the temperature of the high-pressure main steam under various working conditions within a set value range, especially the main air temperature is controlled under recommended parameters in the starting process, and the starting time is shortened.
7. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis according to claim 4, wherein the method comprises the following steps of: the coordinated control system model can realize the optimization of the starting process in a cold state, a warm state and a hot state, control the relation between the margin and the lifting load of the steam turbine, and comprises a high-pressure shaft seal steam inlet regulating valve model, a medium-pressure shaft seal steam inlet regulating valve model and a low-pressure shaft seal steam inlet regulating valve model, wherein the high-pressure shaft seal steam inlet regulating valve model and the medium-pressure shaft seal steam inlet regulating valve model are used for solving the problem of large shaft seal pressure fluctuation during the starting and stopping processes when the shaft seal steam source is converted, and the low-pressure shaft seal steam inlet regulating valve model is used for solving the problem of large low-pressure shaft seal pressure fluctuation during operation.
8. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis according to claim 4, wherein the method comprises the following steps of: the condenser water level control model is used for solving the problem of large water level fluctuation in the starting process, and the temperature-reducing water quantity can be quickly adjusted according to the temperature in the drainage expansion vessel when the drainage expansion vessel water spray electric regulating valve model is automatically thrown.
9. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis of claim 1, wherein the method comprises the following steps of: the fourth step comprises a steam drum water level automatic control model on the starting furnace, a steam temperature automatic control model of the superheater of the starting furnace and a steam drum pressure automatic control model on the starting furnace, wherein the steam drum water level automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate, the steam temperature automatic control model of the superheater of the starting furnace enables the superheated steam temperature automatic control to be put into operation and can normally operate, and the steam drum pressure automatic control model on the starting furnace enables the steam drum water level automatic control to be put into operation and can normally operate.
10. The high-efficiency starting and controlling method for the combined cycle unit based on data analysis of claim 1, wherein the method comprises the following steps of: the fifth step can be performed to automatically open and close the drain valve, for example: before the air is fed into the steam turbine, accumulated water possibly existing in a pipeline of the steam turbine is drained completely.
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| CN202311253245.0A CN117148800A (en) | 2023-09-27 | 2023-09-27 | Efficient starting and optimal control method for combined cycle unit based on data analysis |
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