An intelligent control method and system for economic operation of a combined cycle unit in multiple working conditions

Abstract

The application discloses a kind of combined cycle unit multi-working condition economic operation intelligent control method and system, it is related to energy power and intelligent control technical field, including acquisition combined cycle unit during running gas turbine parameter, waste heat boiler parameter, steam turbine parameter and environmental parameter, constructs multi-source operating state dataset, according to the energy coupling relationship between combustion heat release process, flue gas waste heat transfer process and steam expansion work process in combined cycle unit, the operating characteristic quantity reflecting the thermal coupling state of unit is obtained by feature analysis to multi-source operating state dataset;The combined cycle unit multi-working condition economic operation intelligent control method and system improve the economy, stability and intelligent control level of combined cycle unit under multi-working condition.

Description

Technical Field

[0001] This invention relates to the field of energy power and intelligent control technology, specifically to an intelligent control method and system for multi-condition economic operation of combined cycle units. Background Technology

[0002] A combined cycle power unit is a highly efficient power system that achieves cascaded energy utilization through the coupling of a gas turbine cycle and a steam turbine cycle. It mainly comprises a gas turbine, a waste heat boiler, a steam turbine, and auxiliary control systems. During operation, this type of unit involves complex energy conversion processes such as combustion heat release, flue gas waste heat recovery, steam-water phase change, and multi-stage expansion. Strong coupling relationships exist between the subsystems, giving the overall unit operating state nonlinear, multivariable, and dynamically changing characteristics.

[0003] Existing combined cycle unit control methods typically rely on preset control curves and empirical parameters, adjusting fuel flow, air flow, steam parameters, and load distribution to achieve unit operation control. However, in actual operation, the unit's thermodynamic performance parameters constantly change due to factors such as ambient temperature, fuel characteristics, equipment performance degradation, and grid load variations, making it difficult for fixed control strategies to maintain optimal operating conditions over long periods. Analysis of the underlying thermodynamic mechanisms of the unit reveals that the economic operating state of a combined cycle unit is influenced by multiple factors, including gas turbine compressor performance, combustion chamber heat load distribution, turbine expansion efficiency, waste heat boiler heat exchange characteristics, and turbine steam flow matching. Some key operating parameters are difficult to measure directly, leading to parameter identification errors in traditional model optimization methods. Furthermore, the need to establish numerous state mapping relationships under multiple operating conditions increases the computational complexity of the control model, making it difficult to meet real-time optimization requirements. In addition, existing intelligent control methods often rely on historical operating data for model training, but combined cycle unit operating data suffers from uneven operating condition distribution, resulting in insufficient adaptability to low-frequency conditions and dynamically changing processes. Meanwhile, the economical operation of the unit requires comprehensive consideration of multiple objective factors such as fuel consumption, operating efficiency, and equipment safety constraints, which traditional control methods cannot achieve multi-objective coordinated optimization. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent control method and system for multi-condition economic operation of combined cycle units, thereby solving the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a smart control method for multi-condition economic operation of a combined cycle power unit, comprising:

[0006] Collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters during the operation of the combined cycle unit to construct a multi-source operating status dataset;

[0007] Based on the energy coupling relationship between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process in the combined cycle unit, feature analysis is performed on the multi-source operating status dataset to obtain operating characteristic quantities that reflect the thermodynamic coupling state of the unit.

[0008] Based on operating characteristic quantities, the current operating status of the combined cycle unit is identified under multiple operating conditions to determine the corresponding target operating condition.

[0009] Based on the target operating conditions, and taking into account fuel consumption, energy conversion efficiency and operating safety constraints, the economic operating control parameters under the corresponding operating conditions are calculated.

[0010] Adjust fuel supply, air flow and steam flow according to economic operation control parameters to shift the operating state of the combined cycle unit toward the target economic operating state.

[0011] The multi-condition identification process is updated based on the adjusted operation feedback data to achieve adaptive economic operation control of the combined cycle unit under different operating conditions.

[0012] Preferably, the process of collecting gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters during the operation of the combined cycle unit to construct a multi-source operating status dataset includes:

[0013] Acquire fuel supply parameters, compressor operating parameters, and exhaust temperature parameters during the operation of the gas turbine;

[0014] Acquire flue gas temperature parameters, steam generation parameters, and heat exchange status parameters during the operation of the waste heat boiler;

[0015] Obtain steam flow rate, pressure, and load parameters during the operation of the steam turbine;

[0016] Obtain the ambient temperature and ambient pressure parameters from the environmental parameters;

[0017] The gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters are synchronized over time to form the multi-source operating status dataset.

[0018] Preferably, the step of performing feature analysis on the multi-source operating state dataset based on the energy coupling relationship between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process in the combined cycle unit to obtain operating characteristic quantities reflecting the thermodynamic coupling state of the unit includes:

[0019] Based on the fuel supply parameters and exhaust temperature parameters in the gas turbine parameters, analyze the energy change characteristics corresponding to the combustion heat release process;

[0020] Based on the flue gas temperature parameters and steam generation parameters in the waste heat boiler parameters, analyze the heat conversion characteristics corresponding to the flue gas waste heat transfer process.

[0021] Based on the steam flow rate, pressure, and load parameters in the steam turbine parameters, analyze the energy utilization characteristics corresponding to the steam expansion and work process.

[0022] The operational characteristic quantities are obtained by integrating the energy change characteristics, heat conversion characteristics, and energy utilization characteristics.

[0023] Preferably, the step of identifying multiple operating conditions of the combined cycle unit's current operating status based on operating characteristic quantities and determining the corresponding target operating condition includes:

[0024] Establish a set of operating condition features corresponding to different operating states based on the aforementioned operating characteristic quantities;

[0025] Match the operating characteristic quantities corresponding to the current operating status of the combined cycle unit with the set of operating condition characteristics;

[0026] The target operating condition corresponding to the current combined cycle unit is determined based on the matching results.

[0027] Preferably, the step of calculating the economic operation control parameters under the corresponding operating condition based on the target operating condition, combined with fuel consumption, energy conversion efficiency, and operational safety constraints, includes:

[0028] Obtain the corresponding fuel consumption status, energy conversion efficiency status, and operational safety status based on the target operating conditions;

[0029] Based on the fuel consumption status, energy conversion efficiency status, and operational safety status, the parameters of fuel supply, air flow rate, and steam flow rate are optimized.

[0030] The economic operation control parameters are obtained based on the parameter optimization results.

[0031] Preferably, the step of adjusting fuel supply, air flow, and steam flow according to economic operation control parameters to shift the operating state of the combined cycle unit towards the target economic operating state includes:

[0032] Based on the economic operation control parameters, fuel supply regulation commands, air flow regulation commands, and steam flow regulation commands are generated.

[0033] Adjust the gas turbine fuel input status according to the fuel supply regulation command;

[0034] The air input state during combustion is adjusted according to the air flow regulation command;

[0035] Adjusting the steam input state of the steam turbine according to the steam flow regulation command, so that the combined cycle unit's operating state shifts towards the target economic operating state.

[0036] Preferably, the process of updating the multi-condition identification based on the adjusted operational feedback data includes:

[0037] Acquire operational feedback data after adjusting fuel supply, air flow, and steam flow;

[0038] The operational feedback data is compared with the operational characteristic quantities of the corresponding target operating condition before adjustment;

[0039] The set of operating condition features for the corresponding target operating condition is updated based on the comparison results to improve the adaptability of the multi-condition identification process to changes in the operating status of the combined cycle unit.

[0040] Preferably, the process of updating the multi-condition identification based on operational feedback data further includes:

[0041] Based on the operational feedback data corresponding to different target operating conditions, obtain the state change relationship between different target operating conditions;

[0042] Adjust the identification boundary between target operating conditions based on the aforementioned state change relationship;

[0043] The multi-condition recognition process is updated based on the adjusted recognition boundaries.

[0044] Preferably, the multi-condition recognition process based on the adjusted recognition boundary includes:

[0045] Rematch the operating characteristic quantities corresponding to the current operating status of the combined cycle unit based on the updated identification boundaries;

[0046] When the target operating condition corresponding to the current operating characteristic changes, the economic operating control parameters are recalculated based on the changed target operating condition.

[0047] The operating status of the combined cycle unit is adjusted according to the recalculated economic operating control parameters to achieve adaptive switching control between different operating conditions.

[0048] A multi-condition economic operation intelligent control system for combined cycle power units, used to implement the steps of the aforementioned multi-condition economic operation intelligent control method for combined cycle power units, the system comprising:

[0049] The multi-source operation status data acquisition module is used to collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters and environmental parameters during the operation of the combined cycle unit, and construct a multi-source operation status dataset;

[0050] The thermo-coupling feature analysis module is used to perform feature analysis on the multi-source operating status dataset based on the energy coupling relationship between the combustion heat release process, flue gas waste heat transfer process and steam expansion work process in the combined cycle unit, and obtain operating feature quantities that reflect the thermo-coupling state of the unit.

[0051] The multi-condition identification module is used to identify the current operating status of the combined cycle unit based on the operating characteristic quantities and determine the corresponding target operating condition.

[0052] The economic operation parameter optimization module is used to calculate the economic operation control parameters under the corresponding operating conditions based on the target operating conditions, combined with fuel consumption, energy conversion efficiency and operating safety constraints.

[0053] The operation adjustment and control module is used to adjust the fuel supply, air flow and steam flow according to the economic operation control parameters, so as to migrate the operating state of the combined cycle unit to the target economic operating state.

[0054] The feedback update module is used to update the identification process in the multi-condition identification module based on the adjusted operation feedback data, so as to realize the adaptive economic operation control of the combined cycle unit under different operating conditions.

[0055] As can be seen from the above technical solution, the present invention has the following beneficial effects:

[0056] This intelligent control method and system for multi-condition economic operation of combined cycle units constructs a multi-source operating status dataset by collecting parameters from the gas turbine, waste heat boiler, steam turbine, and environment during the operation of the combined cycle unit. It then analyzes the energy coupling relationships between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion and work process to obtain operating characteristic quantities that characterize the thermodynamic coupling state of the unit. This improves the ability to characterize the complex operating states of combined cycle units and reduces the operating status identification bias caused by the difficulty in directly obtaining key state parameters. By identifying multiple operating conditions based on these operating characteristic quantities, it can determine the operating conditions based on the unit's real-time operating data. The operation status is determined to correspond to the target operating condition, avoiding the problem that traditional fixed control curves are difficult to adapt to environmental changes, equipment performance degradation and load fluctuations. Furthermore, the economic operation control parameters are calculated by combining fuel consumption, energy conversion efficiency and operation safety constraints, and the unit operation status is migrated to the target economic operation status by adjusting fuel supply, air flow and steam flow, thus realizing the optimization of operating parameters under multi-objective constraints. At the same time, by using the adjusted operation feedback data to update the multi-operation condition identification process, the control strategy can adapt to the state changes during the long-term operation of the unit, improving the economy, stability and intelligent control level of the combined cycle unit under multi-operation conditions. Attached Figure Description

[0057] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Example 1:

[0060] like Figure 1 As shown, the present invention provides a technical solution: an intelligent control method for multi-condition economic operation of a combined cycle power unit, characterized in that it includes:

[0061] Collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters during the operation of the combined cycle unit to construct a multi-source operating status dataset;

[0062] Based on the energy coupling relationship between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process in the combined cycle unit, feature analysis is performed on the multi-source operating status dataset to obtain operating characteristic quantities that reflect the thermodynamic coupling state of the unit.

[0063] Based on operating characteristic quantities, the current operating status of the combined cycle unit is identified under multiple operating conditions to determine the corresponding target operating condition.

[0064] Based on the target operating conditions, and taking into account fuel consumption, energy conversion efficiency and operating safety constraints, the economic operating control parameters under the corresponding operating conditions are calculated.

[0065] Adjust fuel supply, air flow and steam flow according to economic operation control parameters to shift the operating state of the combined cycle unit toward the target economic operating state.

[0066] The multi-condition identification process is updated based on the adjusted operation feedback data to achieve adaptive economic operation control of the combined cycle unit under different operating conditions.

[0067] In the above scheme, the combined cycle unit realizes the conversion of fuel chemical energy into electrical energy through the energy transfer relationship between the gas turbine, waste heat boiler, and steam turbine. Fuel and air in the gas turbine enter the combustion system and undergo a combustion reaction, producing high-temperature gas with thermal energy. This high-temperature gas drives the gas turbine to expand, doing work and outputting mechanical energy. The flue gas discharged from the gas turbine enters the waste heat boiler, where the heat energy is transferred to the feedwater through a heat exchange process, converting the feedwater into steam with a set pressure and temperature. The steam enters the steam turbine and undergoes an expansion process, driving the steam turbine to rotate and outputting mechanical energy. There is an energy coupling relationship between the gas turbine, waste heat boiler, and steam turbine regarding fuel input, flue gas waste heat utilization, and steam output.

[0068] In one implementation, operating parameters are acquired through data acquisition devices located at different equipment positions within the combined cycle unit. These parameters include: gas turbine parameters (fuel supply, air flow, compressor outlet pressure, compressor outlet temperature, combustion chamber temperature, and gas turbine output power); waste heat boiler parameters (flue gas inlet temperature, flue gas outlet temperature, feedwater flow, steam pressure, and steam temperature); steam turbine parameters (steam inlet pressure, steam inlet temperature, steam flow, exhaust pressure, and output power); and environmental parameters (ambient temperature, ambient pressure, and ambient humidity). By performing time synchronization processing, anomaly data filtering, and data format standardization on these parameters, a multi-source operating status dataset describing the combined cycle unit's operating condition is generated.

[0069] In the above scheme, feature analysis is performed on the multi-source operating state dataset based on the energy relationships between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process. By analyzing the relationship between fuel input and combustion process parameters, operating characteristic quantities reflecting the combustion state of the gas turbine are obtained; by analyzing the relationship between flue gas temperature changes, heat exchange process parameters, and steam generation parameters, operating characteristic quantities reflecting the heat transfer state of the waste heat boiler are obtained; and by analyzing the relationship between steam parameter changes and steam turbine output power, operating characteristic quantities reflecting the energy conversion state of the steam turbine are obtained. These operating characteristic quantities are combined to form a dataset characterizing the thermodynamic coupling state of the combined cycle unit.

[0070] In the above scheme, the current operating status of the combined cycle unit is identified based on operating characteristic quantities. Specifically, the operating characteristic quantities are input into the operating condition identification model, and the target operating condition corresponding to the current combined cycle unit is determined by matching the operating characteristic quantities with preset operating condition characteristics. The target operating condition is determined based on the unit load demand, fuel input status, environmental parameters, and equipment operating status, and is used to represent the current operating conditions of the combined cycle unit.

[0071] After determining the target operating condition, economic operating control parameters are calculated based on the corresponding operating requirements. During the calculation, fuel consumption parameters, energy conversion efficiency parameters, and operational safety constraints are used as the basis for calculating the control parameters. These operational safety constraints include combustion temperature limits, equipment pressure limits, speed limits, and steam parameter limits. By coordinating the calculation of fuel supply parameters, air flow parameters, and steam flow parameters, economic operating control parameters that meet the requirements of the target operating condition are obtained.

[0072] In the above scheme, the combined cycle unit is regulated and controlled according to economic operating control parameters. The control system sends control commands to the fuel conditioning unit, air conditioning unit, and steam conditioning unit based on the calculated control parameters, so that the fuel supply, air flow, and steam flow are adjusted according to the control parameters. Changes in fuel supply affect the heat energy input generated in the combustion process, changes in air flow affect the oxygen supply status in the combustion process, and changes in steam flow affect the steam turbine output power. Through the coordinated adjustment of the above parameters, the combined cycle unit achieves an economic operating state corresponding to the target operating conditions.

[0073] In the above scheme, after the control parameters are adjusted, the system continues to collect operating feedback data from the combined cycle unit and updates the operating characteristic quantities based on the feedback data. The updated operating characteristic quantities are then used to re-execute the operating condition identification process, enabling the control system to adjust the target operating condition judgment results and economic operation control parameters according to changes in the unit's operating state, thus achieving continuous control of the combined cycle unit during operation.

[0074] Through the aforementioned control process, the combined cycle unit's operating status data acquisition, thermo-coupling characteristic analysis, operating condition identification, control parameter calculation, equipment adjustment, and feedback updates form a closed-loop control flow, enabling the combined cycle unit to perform economical operation control based on changes in operating status. This control method establishes a control basis based on the unit's internal energy conversion relationships, ensuring coordinated operation among the gas turbine, waste heat boiler, and steam turbine.

[0075] Example 2:

[0076] The system collects parameters from the gas turbine, waste heat boiler, steam turbine, and environmental parameters during the operation of the combined cycle unit to construct a multi-source operating status dataset. This dataset includes acquiring fuel supply parameters, compressor operating parameters, and exhaust temperature parameters from the gas turbine; flue gas temperature parameters, steam generation parameters, and heat exchange status parameters from the waste heat boiler; steam flow rate parameters, pressure parameters, and load parameters from the steam turbine; and ambient temperature and pressure parameters from the environmental parameters. The system then performs time synchronization processing on the gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters to form the multi-source operating status dataset.

[0077] In the above scheme, by collecting the gas turbine, waste heat boiler, steam turbine and environmental status parameters during the operation of the combined cycle unit, a multi-source operating status dataset containing the operating information of each energy conversion link is established, which provides a data foundation for subsequent thermo-coupling status analysis, operating condition identification and economic operation control parameter calculation.

[0078] In one embodiment, during gas turbine operation, gas turbine operating parameters are acquired through detection devices installed in the fuel supply system, compressor system, and exhaust system. The fuel supply parameters describe the fuel input state into the combustion system, including fuel flow rate, fuel pressure, and fuel temperature. The compressor operating parameters describe the operating state during air compression, including compressor inlet pressure, compressor outlet pressure, compressor inlet temperature, and compressor outlet temperature. The exhaust temperature parameters describe the flue gas output state after gas turbine combustion, including gas turbine exhaust temperature and exhaust temperature variation parameters.

[0079] By collecting the aforementioned gas turbine parameters, the operating status information of the gas turbine during fuel input, air compression, and flue gas output can be obtained, enabling the control system to acquire the energy input and energy conversion status on the gas turbine side.

[0080] In the above scheme, during the operation of the waste heat boiler, operating parameters are acquired through detection devices installed in the flue gas passage, feedwater system, and steam output system. Specifically, the flue gas temperature parameters describe the heat transfer state after the gas turbine exhaust enters the waste heat boiler, including the flue gas inlet temperature and flue gas outlet temperature; the steam generation parameters describe the process by which the waste heat boiler converts flue gas heat energy into steam heat energy, including steam flow rate, steam pressure, and steam temperature; and the heat exchange state parameters describe the heat exchange state between the flue gas and feedwater, including heat exchange medium temperature, heat exchange flow rate, and heat exchange equipment operating parameters.

[0081] By collecting the operating parameters of the waste heat boiler, the heat transfer status during the utilization of waste heat from the gas turbine exhaust can be obtained, providing data support for analyzing the energy connection relationship between the gas turbine and the steam turbine.

[0082] In the above scheme, during the operation of the steam turbine, operating parameters are acquired by data acquisition devices installed at the steam input end, the expansion work unit, and the output end. Specifically, the steam flow rate parameter describes the steam input state into the steam turbine; the pressure parameter describes the pressure change state during the steam expansion process inside the steam turbine, including the inlet steam pressure and the exhaust steam pressure; and the load parameter describes the steam turbine output power state, including the steam turbine output power parameter and the unit load parameter.

[0083] By collecting the operating parameters of the steam turbine, we can obtain information on the operating status during the conversion of steam thermal energy into mechanical energy and electrical energy.

[0084] In the above scheme, environmental parameter acquisition devices are used to obtain operating environment information of the combined cycle unit. Among these, ambient temperature parameters describe the ambient temperature state of the unit's operating environment, and ambient pressure parameters describe the ambient pressure state. These environmental parameters reflect the impact of external operating conditions on the gas turbine's intake state, combustion process, and overall energy conversion process.

[0085] In the above scheme, the collected gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters are processed for time synchronization. Since there are energy transfer processes between the various devices in the combined cycle unit, different device parameters correspond to different time points. Therefore, it is necessary to use a time stamp matching method to process the data acquired by different acquisition devices according to a unified time base.

[0086] Specifically, a time stamp is set for each set of collected data. Based on the time stamp, the data from the gas turbine side, the waste heat boiler side, the steam turbine side, and the environmental data are arranged so that the operating parameters of each device at the same time point form corresponding data groups. After time synchronization processing, a multi-source operating status dataset is formed, which includes information on the operating status of the gas turbine, the heat transfer status of the waste heat boiler, the power output status of the steam turbine, and the environmental status.

[0087] Through the aforementioned data acquisition and synchronous processing, a correspondence is established between the operating parameters of different energy conversion stages in the combined cycle unit, providing a data foundation for subsequent extraction of operating characteristic quantities and multi-condition identification based on thermo-coupling relationships. This dataset can reflect the fuel input status, heat transfer status, steam conversion status, and environmental impact status during the operation of the combined cycle unit, thereby supporting the economic operation control process of the combined cycle unit.

[0088] Example 3:

[0089] Based on the energy coupling relationship between the combustion heat release process, flue gas waste heat transfer process, and steam expansion work process in a combined cycle unit, feature analysis is performed on a multi-source operating status dataset to obtain operating characteristic quantities reflecting the thermodynamic coupling state of the unit. This includes analyzing the energy change characteristics corresponding to the combustion heat release process based on fuel supply parameters and exhaust temperature parameters in the gas turbine parameters; analyzing the heat conversion characteristics corresponding to the flue gas waste heat transfer process based on flue gas temperature parameters and steam generation parameters in the waste heat boiler parameters; and analyzing the energy utilization characteristics corresponding to the steam expansion work process based on steam flow rate parameters, pressure parameters, and load parameters in the steam turbine parameters. The operating characteristic quantities are obtained by integrating the energy change characteristics, heat conversion characteristics, and energy utilization characteristics.

[0090] In the above scheme, the operation of the combined cycle unit includes the gas turbine combustion heat release process, the waste heat transfer process of the waste heat boiler flue gas, and the steam expansion and work process of the steam turbine. These processes form a continuous thermodynamic conversion link through energy transfer relationships. By performing feature analysis on the operating parameters of different equipment in the multi-source operating status dataset, the equipment parameters are converted into operating characteristic quantities that can reflect the energy conversion status, enabling the control system to identify the unit's operating status based on the internal thermodynamic coupling relationship of the combined cycle unit.

[0091] In one embodiment, the energy change characteristics corresponding to the combustion heat release process are analyzed based on the fuel supply parameters and exhaust temperature parameters in the gas turbine parameters. The fuel supply parameters describe the state of the fuel input to the combustion system. After entering the combustion system, the fuel mixes with compressed air and undergoes a combustion reaction, converting the chemical energy in the fuel into the thermal energy of the combustion products. The exhaust temperature parameters reflect the thermal state of the high-temperature gas produced during the combustion process after it expands and performs work in the gas turbine.

[0092] Specifically, based on the correspondence between fuel supply parameters and exhaust temperature parameters, the influence of fuel input changes on the exhaust thermal state of the gas turbine is analyzed to obtain energy change characteristics representing the combustion heat release process. These energy change characteristics include fuel input state characteristics, combustion heat output state characteristics, and exhaust heat energy change state characteristics, used to describe the energy conversion process on the gas turbine side.

[0093] In the above scheme, the heat conversion characteristics corresponding to the waste heat transfer process are analyzed based on the flue gas temperature parameter and steam generation parameter in the waste heat boiler parameters. After the flue gas discharged from the gas turbine enters the waste heat boiler, the heat in the flue gas is transferred to the feedwater through heat exchange components, causing the feedwater to absorb heat and form steam. The flue gas temperature parameter is used to describe the thermal state changes of the flue gas at the inlet and outlet of the waste heat boiler, and the steam generation parameter is used to describe the state of the output steam of the waste heat boiler.

[0094] Specifically, based on the changes in flue gas temperature parameters and the corresponding relationship between steam generation parameters, the transfer process of waste heat in the flue gas within the waste heat boiler is analyzed to obtain heat conversion characteristics representing the conversion state of flue gas thermal energy to steam thermal energy. These heat conversion characteristics include flue gas heat input state characteristics, heat exchange process state characteristics, and steam generation state characteristics, used to describe the energy transfer process on the waste heat boiler side.

[0095] In the above scheme, the energy utilization characteristics corresponding to the steam expansion and work process are analyzed based on the steam flow rate, pressure, and load parameters in the steam turbine parameters. After the steam generated by the waste heat boiler enters the steam turbine, it undergoes an expansion process under the action of steam pressure. The internal thermal energy of the steam is converted into the mechanical energy of the steam turbine, and then into electrical energy through the power generation system. The steam flow rate parameter describes the steam input state entering the steam turbine, the pressure parameter describes the state changes during the steam expansion process, and the load parameter describes the steam turbine output power state.

[0096] Specifically, based on the correlation between steam flow rate parameters, pressure parameters, and load parameters, the conversion state between steam input energy and output power is analyzed to obtain energy utilization characteristics representing the steam expansion and work process. These energy utilization characteristics include steam input state characteristics, expansion process state characteristics, and output power state characteristics, used to describe the energy conversion process on the steam turbine side.

[0097] In the above scheme, the energy change characteristics corresponding to the combustion heat release process, the heat conversion characteristics corresponding to the flue gas waste heat transfer process, and the energy utilization characteristics corresponding to the steam expansion work process are integrated to form operational characteristic quantities. During the integration process, the characteristic data corresponding to different processes are correlated and matched according to the energy transfer sequence between the gas turbine, waste heat boiler, and steam turbine, so that the operational characteristic quantities simultaneously include the fuel input state, the flue gas waste heat utilization state, and the steam work state.

[0098] Specifically, energy change characteristics, heat conversion characteristics, and energy utilization characteristics are combined according to a unified data format to form a dataset that can characterize the overall thermodynamic coupling state of the combined cycle unit. This operational characteristic quantity can reflect the correlation between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process, providing data basis for subsequent identification of combined cycle unit operating conditions and calculation of economic operation control parameters.

[0099] Through the above feature analysis process, the collected equipment operating parameters are converted into operating characteristic quantities that reflect the energy conversion state of the combined cycle unit, enabling the control system to analyze the unit's operating state based on the coupling relationship between thermodynamic processes and execute subsequent control processes according to changes in the operating state.

[0100] Example 4:

[0101] Based on operating characteristic quantities, the current operating status of the combined cycle unit is identified under multiple operating conditions to determine the corresponding target operating condition. This includes establishing a set of operating condition characteristics corresponding to different operating states based on the operating characteristic quantities; matching the operating characteristic quantities corresponding to the current operating status of the combined cycle unit with the set of operating condition characteristics; and determining the target operating condition corresponding to the current combined cycle unit based on the matching results.

[0102] In the above scheme, the combined cycle unit is affected by the combined operating conditions of the gas turbine, the waste heat boiler, the steam turbine, and changes in environmental parameters during operation, resulting in different thermo-coupling states under different operating conditions. By establishing a set of operating condition features based on operating characteristic quantities and matching the operating characteristic quantities corresponding to the current operating state with the set of operating condition features, the current operating state of the combined cycle unit can be identified, providing a basis for the target operating condition for subsequent calculation of economic operation control parameters.

[0103] In one implementation, a set of operating condition characteristics corresponding to different operating states is established based on historical operating data of the combined cycle unit, equipment operating parameters, and operating characteristic quantities. The set of operating condition characteristics includes energy change characteristics, heat conversion characteristics, and energy utilization characteristics corresponding to each operating state.

[0104] Specifically, the gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters collected under different operating conditions are analyzed to obtain corresponding operating characteristic quantities. Based on the correlation between the operating characteristic quantities, data with the same operating conditions are classified to form corresponding operating condition feature sets. Each operating condition feature set is used to represent the thermodynamic coupling characteristics of the combined cycle unit under the corresponding operating condition.

[0105] In the above scheme, the operating condition feature set is established based on the operating conditions of the combined cycle unit. These operating conditions include the unit's output power status, fuel input status, air supply status, flue gas waste heat utilization status, steam generation status, and steam expansion work status. By performing correlation analysis on the operating characteristic quantities corresponding to the above operating conditions, the established operating condition feature set can reflect the energy conversion relationships under different operating conditions of the combined cycle unit.

[0106] In the above scheme, the operating characteristic quantities corresponding to the current operating status of the combined cycle unit are matched with the set of operating condition characteristics. Specifically, the operating characteristic quantities corresponding to the current operating status are obtained by performing feature analysis on the gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters collected in real time.

[0107] The energy change characteristics, heat conversion characteristics, and energy utilization characteristics in the current operating characteristics are compared with the corresponding characteristics in the operating condition characteristic set. Based on the correspondence between the characteristics, the matching result between the current operating state and each operating condition characteristic set is determined.

[0108] In one implementation, the matching process between the operating feature quantity and the set of operating condition features is achieved through feature distance calculation. The current operating feature quantity is converted into a feature vector, and this feature vector is compared with the standard feature vectors in each set of operating condition features. The operating condition category corresponding to the current operating feature quantity is determined based on the calculation result.

[0109] In another implementation, the matching process between operational features and the set of operating condition features is achieved through a classification model. The operational features are input into a pre-established operating condition identification model, which then outputs the operating condition identification result based on the mapping relationship between the input features and the corresponding set of operating condition features.

[0110] In the above scheme, the target operating condition corresponding to the current combined cycle unit is determined based on the matching results. When the current operating characteristic quantity and a certain set of operating condition characteristics satisfy a correspondence, the operating state corresponding to that set of operating condition characteristics is determined as the target operating condition.

[0111] The target operating condition represents the current operating conditions of the combined cycle unit and serves as the basis for subsequent calculations of economic operating control parameters. The control system performs subsequent operating parameter optimization based on the fuel supply demand, air flow demand, and steam flow demand corresponding to the target operating condition.

[0112] Through the above multi-condition identification process, the combined cycle unit can determine the corresponding target operating condition based on the real-time operating status, enabling the control system to select the corresponding economical operation control strategy according to different operating conditions, and achieving the matching between the operating status and control parameters of the combined cycle unit.

[0113] Example 5:

[0114] Based on the target operating conditions, and in conjunction with fuel consumption, energy conversion efficiency, and operational safety constraints, the economic operation control parameters under the corresponding operating conditions are calculated. This includes obtaining the corresponding fuel consumption status, energy conversion efficiency status, and operational safety status based on the target operating conditions; optimizing the parameters of fuel supply, air flow, and steam flow based on the fuel consumption status, energy conversion efficiency status, and operational safety status; and obtaining the economic operation control parameters based on the parameter optimization results.

[0115] In the above scheme, the control requirements corresponding to the current operating state of the combined cycle unit are determined according to the target operating conditions. In combination with the fuel consumption status, energy conversion efficiency status and operating safety status, the fuel supply parameters, air flow parameters and steam flow parameters that affect the economic operating state of the unit are optimized and calculated to obtain the economic operating control parameters corresponding to the target operating conditions.

[0116] In one implementation, based on the target operating condition determined by the multi-condition identification process, operating status data corresponding to the target operating condition is retrieved. The operating status data includes fuel input status, gas turbine output status, waste heat boiler steam generation status, steam turbine output status, and equipment operating limitation status.

[0117] Among them, the fuel consumption status is used to indicate the correspondence between the fuel input and power generation output of the combined cycle unit; the energy conversion efficiency status is used to indicate the energy utilization status after the fuel chemical energy is converted by the gas turbine, waste heat boiler and steam turbine; and the operation safety status is used to indicate whether the combustion temperature, equipment pressure, steam parameters and equipment operating parameters meet the set operating range.

[0118] In the above scheme, an economic operation control parameter optimization model is established based on fuel consumption status, energy conversion efficiency status, and operational safety status. By adjusting the variables of fuel supply, air flow, and steam flow, the operating status of the combined cycle unit is made to meet the control requirements corresponding to the target operating condition.

[0119] Specifically, fuel supply, air flow, and steam flow are used as control variables, and fuel consumption, energy conversion efficiency, and operational safety constraints are used as calculation conditions to establish an economic operation control parameter calculation model:

[0120] minF = α × B - β × η;

[0121] Where F represents the economic operation control objective function; B represents the fuel consumption per unit time; η represents the combined cycle unit energy conversion efficiency; α represents the fuel consumption weighting coefficient; and β represents the energy conversion efficiency weighting coefficient.

[0122] In the above formula, by adjusting the weighting coefficients α and β, the control objective simultaneously considers both fuel consumption and energy conversion efficiency. Under the condition of satisfying operational safety constraints, the fuel supply parameters, air flow parameters, and steam flow parameters that make the objective function F meet the set requirements are calculated.

[0123] In the above scheme, operational safety constraints are used to limit the adjustment range of economic operation control parameters. Specifically, based on the operating requirements of the combined cycle unit equipment, corresponding constraints are set for combustion chamber temperature, gas turbine exhaust temperature, waste heat boiler steam pressure, steam temperature, and steam turbine operating parameters.

[0124] When the calculated control parameters meet the fuel consumption requirements, energy conversion efficiency requirements, and operational safety constraints, this set of parameters is determined as the economic operation control parameters corresponding to the target operating condition.

[0125] In one implementation, the economic operation control parameters include fuel regulating valve opening parameters, air conditioning unit control parameters, and steam regulating valve control parameters. The control system generates corresponding control commands based on the calculated economic operation control parameters and sends them to the fuel supply system, air supply system, and steam conditioning system to adjust the operating parameters of the combined cycle unit.

[0126] In the above scheme, by jointly analyzing the target operating conditions, fuel consumption status, energy conversion efficiency status, and operating safety status, the calculation process of economic operation control parameters takes into account both energy utilization status and equipment operating constraints, thus avoiding changes in the operating status of other equipment caused by adjusting a single operating parameter.

[0127] Through the above parameter optimization process, the fuel supply parameters, air flow parameters, and steam flow parameters corresponding to the current target operating conditions are obtained, providing a control basis for the subsequent adjustment of the operating status of the combined cycle unit, so that the combined cycle unit operates according to the calculated economic operating control parameters.

[0128] Example 6:

[0129] Adjusting fuel supply, air flow, and steam flow according to economic operation control parameters to shift the combined cycle unit's operating state towards the target economic operation state includes generating fuel supply adjustment commands, air flow adjustment commands, and steam flow adjustment commands based on the economic operation control parameters; adjusting the gas turbine fuel input state according to the fuel supply adjustment commands; adjusting the air input state during combustion according to the air flow adjustment commands; and adjusting the steam turbine input steam state according to the steam flow adjustment commands, thereby shifting the combined cycle unit's operating state towards the target economic operation state.

[0130] In the above scheme, the fuel supply status, air input status and steam input status of the combined cycle unit are coordinated and adjusted according to the economic operation control parameters, so that the energy conversion process between the gas turbine, waste heat boiler and steam turbine operates in accordance with the control requirements corresponding to the target operating conditions.

[0131] In one implementation, corresponding control commands are generated based on the economic operation control parameters calculated in the aforementioned steps. These economic operation control parameters include fuel supply regulation parameters, air flow regulation parameters, and steam flow regulation parameters. The control system generates fuel supply regulation commands, air flow regulation commands, and steam flow regulation commands based on these parameters and sends the corresponding control commands to the actuators in the combined cycle unit.

[0132] The fuel supply regulation command controls the regulating device of the gas turbine fuel supply system. By changing the opening of the fuel regulating valve or the operating status of the fuel delivery equipment, it ensures that the amount of fuel entering the combustion system meets the control requirements corresponding to the target operating condition. After the fuel input status changes, the thermal energy input status of the combustion system changes, further affecting the gas turbine output power and exhaust temperature.

[0133] In the above scheme, the air input state during the combustion process is adjusted according to the air flow regulation command. The air flow regulation command is sent to the air supply regulation device, which controls the compressor intake regulation mechanism or the air flow control mechanism to ensure that the air flow entering the combustion system reaches the state corresponding to the economic operating control parameters.

[0134] By adjusting the air input state, the fuel input quantity is kept in correspondence with the air input quantity, so that the combustion process meets the operating conditions corresponding to the target operating conditions, while maintaining the stable operating state of the gas turbine combustion system.

[0135] In the above scheme, the steam input state to the steam turbine is adjusted according to the steam flow regulation command. The steam flow regulation command is sent to the steam regulation device, which controls the steam regulation valve or steam delivery mechanism to ensure that the steam flow entering the steam turbine reaches the state corresponding to the economic operating control parameters.

[0136] Changes in steam flow affect the steam expansion process inside the steam turbine and its output power. By adjusting the steam input state, the operating state of the steam turbine can be matched with that of the gas turbine and the steam generation state of the waste heat boiler.

[0137] In the above scheme, fuel supply regulation, air flow regulation, and steam flow regulation are not executed independently, but are coordinated and controlled based on the energy transfer relationships within the combined cycle unit. The fuel supply status affects the exhaust energy of the gas turbine, the exhaust energy affects the steam generation status of the waste heat boiler, and the steam generation status affects the input steam status of the steam turbine. Therefore, each regulation process forms an interconnected control process through energy transfer relationships.

[0138] In one implementation, after the control system completes parameter adjustment, it continues to collect operating parameters of the gas turbine, waste heat boiler, steam turbine, and environmental parameters, and compares the adjusted operating data with the data corresponding to the target economic operating state. Based on the operating feedback results, it determines whether the current operating state has reached the target operating condition.

[0139] When the operating feedback data meets the operating conditions corresponding to the target operating condition, the current economic operating control parameters are maintained; when there is a deviation between the operating feedback data and the target operating condition, the control parameters are recalculated based on the updated operating status, and new fuel supply adjustment commands, air flow adjustment commands, and steam flow adjustment commands are generated.

[0140] Through the aforementioned control process, a coordinated regulation relationship is established among the three energy conversion links of the combined cycle unit—fuel supply, air input, and steam input—allowing the unit's operating state to be adjusted according to the target economic operating state. This method achieves economical operation control of the combined cycle unit under different operating conditions through closed-loop control of actual operating parameters by actuators.

[0141] Example 7:

[0142] The process of updating the multi-condition identification process based on the adjusted operating feedback data includes acquiring operating feedback data after adjusting fuel supply, air flow, and steam flow; comparing the operating feedback data with the operating characteristic quantities of the corresponding target operating condition before adjustment; and updating the operating condition characteristic set of the corresponding target operating condition based on the comparison results, so as to improve the adaptability of the multi-condition identification process to changes in the operating status of the combined cycle unit.

[0143] In the above scheme, by acquiring the operating feedback data after the combined cycle unit executes the economic operation control parameters, and comparing the feedback data with the operating characteristic quantities corresponding to the target operating condition before adjustment, the operating condition feature set is updated according to the actual operating state changes, so that the multi-condition identification process can adjust the identification basis according to the changes in the unit's operating state, and realize the dynamic update of the operating condition identification process.

[0144] In one implementation, after fuel supply regulation, air flow regulation, and steam flow regulation are completed, operational feedback data is acquired through data acquisition devices located at various equipment positions within the combined cycle unit. The operational feedback data includes gas turbine fuel input parameters, air flow parameters, exhaust temperature parameters, waste heat boiler flue gas temperature parameters, steam generation parameters, steam turbine steam flow parameters, pressure parameters, and load parameters.

[0145] By collecting adjusted operational feedback data, the actual operating status of the combined cycle unit after implementing economic operating control parameters is obtained, and this data is used to determine the impact of the current control parameters on the operating status of the gas turbine, waste heat boiler, and steam turbine.

[0146] In the above scheme, the operational feedback data is compared with the operational characteristic quantities of the corresponding target operating condition before adjustment. Specifically, the operational feedback data is analyzed to obtain the energy change characteristics, heat conversion characteristics, and energy utilization characteristics after adjustment.

[0147] The adjusted operating characteristic quantities are matched and analyzed with the original operating characteristic quantities corresponding to the target operating conditions to determine whether the fuel supply status, air input status, flue gas waste heat transfer status, and steam expansion work status have changed.

[0148] In one implementation, the changes in the operating status of the combined cycle unit are determined by calculating the differences between the operating characteristic quantities before and after adjustment. When the operating characteristic quantity corresponding to the operating feedback data maintains a correspondence with the operating characteristic quantity corresponding to the target operating condition, the operating condition characteristic set corresponding to the current target operating condition is retained; when the operating characteristic quantity corresponding to the operating feedback data changes, the operating condition characteristic set is adjusted according to the changed operating characteristic quantity.

[0149] In the above scheme, the set of operating characteristics for the corresponding target operating condition is updated based on the comparison between the operational feedback data and the original target operating condition's operational characteristics. The update process includes adding adjusted operational characteristic data, correcting existing operational characteristic parameters, and adjusting the correspondence between operating condition characteristics.

[0150] Specifically, the adjusted operating characteristic quantity is used as a new operating state sample corresponding to the target operating condition and stored in the corresponding operating condition feature set, so that the operating condition feature set contains operating state information before and after control.

[0151] In the above scheme, by updating the set of operating condition features, the multi-operating condition identification process can adjust the identification criteria according to changes in the actual operation feedback of the combined cycle unit. When the combined cycle unit is affected by changes in equipment operating status, environmental parameters, or load demand, the updated set of operating condition features can reflect the changed operating status, so that the subsequent operating condition identification process is executed based on the updated data.

[0152] In one implementation, the update process of the operating condition feature set is automatically executed by the control system. After acquiring the operational feedback data, the control system filters, parses, and classifies the data, adds data that meets the target operating condition conditions to the corresponding operating condition feature set, and deletes abnormal data that does not meet the set conditions.

[0153] In the above scheme, the updated set of operating condition features is used again in the next combined cycle unit operating status identification process. The control system generates new operating feature quantities based on the real-time collected operating parameters, matches them with the updated set of operating condition features to determine the corresponding target operating condition, and then calculates the economic operating control parameters based on the target operating condition.

[0154] Through the above feedback update process, the combined cycle unit's operating data acquisition, operating characteristic analysis, operating condition identification, and control parameter adjustment form a continuous closed loop process. This enables the multi-operating condition identification process to be updated based on actual operating feedback data, thereby achieving continuous and economical operation control of the combined cycle unit under different operating conditions.

[0155] Example 8:

[0156] The process of updating the multi-condition identification process based on operational feedback data also includes obtaining the state change relationship between different target operational conditions based on the operational feedback data corresponding to different target operational conditions; adjusting the identification boundary between target operational conditions based on the state change relationship; and updating the multi-condition identification process based on the adjusted identification boundary.

[0157] In the above scheme, by analyzing the operation feedback data corresponding to different target operating conditions, the characteristic change relationship of the combined cycle unit in the process of switching between different operating states is obtained, and the identification boundary between different target operating conditions is adjusted according to the law of operating state change, so that the multi-condition identification process can be updated according to the actual operating state change.

[0158] In one implementation, during the operation of the combined cycle unit, the control system acquires operational feedback data corresponding to different target operating conditions. The operational feedback data includes gas turbine fuel supply parameters, air flow parameters, exhaust temperature parameters, waste heat boiler flue gas temperature parameters, steam generation parameters, steam turbine steam flow parameters, pressure parameters, and load parameters.

[0159] The control system performs feature analysis on the operational feedback data corresponding to different target operating conditions to obtain the operational characteristic quantities corresponding to each target operating condition. The operational characteristic quantities include the energy change characteristics corresponding to the combustion heat release process, the heat conversion characteristics corresponding to the flue gas waste heat transfer process, and the energy utilization characteristics corresponding to the steam expansion work process.

[0160] In the above scheme, the state change relationship between target operating conditions is obtained based on the operating characteristic quantities corresponding to different target operating conditions. Specifically, the operating characteristic quantities corresponding to adjacent operating conditions are correlated to determine the changes in fuel input state, heat transfer state, and steam output state during the transition of the combined cycle unit from one target operating condition to another.

[0161] For example, when the load demand of a combined cycle unit changes, the fuel supply status, air input status, flue gas waste heat status, and steam flow status also change. The control system determines the state transition relationship between different target operating conditions by analyzing the changes in the operating characteristic quantities corresponding to the changes in the above parameters.

[0162] In the above scheme, the identification boundaries between target operating conditions are adjusted according to the state change relationship. The identification boundaries are used to represent the distinguishing range of operating characteristic quantities corresponding to different target operating conditions. When the operating feedback data indicates that there is feature overlap or a change in the state change relationship between different target operating conditions, the control system adjusts the corresponding identification boundaries according to the updated operating feedback data.

[0163] Specifically, based on the changes in operating characteristic quantities during the transition of target operating conditions, the range of characteristic parameters in the operating condition characteristic set is updated so that the range of operating characteristic quantities corresponding to different target operating conditions maintains a corresponding relationship with the actual operating state.

[0164] In one implementation, the identification boundary adjustment process is performed based on the results of changes in operating characteristic quantities. The control system acquires data on changes in operating characteristic quantities during the transition between different target operating conditions, and redetermines the characteristic intervals corresponding to each target operating condition based on the changed characteristic data, so that the current operating characteristic quantity can match the corresponding target operating condition according to the updated identification boundary.

[0165] In the above scheme, the multi-condition identification process is updated based on the adjusted identification boundaries. Specifically, the adjusted identification boundaries are stored in the condition identification model or the condition feature set. When the combined cycle unit collects new operating status data, the control system matches the operating feature quantities according to the updated identification boundaries to determine the current target operating condition.

[0166] Through the above update process, the multi-condition identification process can dynamically adjust the distinction between different target operating conditions by combining the actual operating feedback data of the combined cycle unit, so that the operating condition identification basis corresponds to the actual operating status of the unit, and improves the continuity and adaptability of the operating condition judgment process.

[0167] In the above scheme, the identification boundary is adjusted by utilizing the state change relationship between different target operating conditions, so that the combined cycle unit can determine the target operating condition according to the updated operating condition identification rules under the conditions of load change, environmental change and operating parameter change, and provide corresponding control basis for the calculation of economic operation control parameters.

[0168] Example 9:

[0169] The multi-condition identification process is updated based on the adjusted identification boundary, including rematching the operating characteristic quantity corresponding to the current operating state of the combined cycle unit according to the updated identification boundary; when the target operating condition corresponding to the current operating characteristic quantity changes, the economic operation control parameters are recalculated according to the changed target operating condition; and the operating state of the combined cycle unit is adjusted according to the recalculated economic operation control parameters to achieve adaptive switching control between different operating conditions.

[0170] In the above scheme, the current operating state of the combined cycle unit is re-identified using the updated identification boundary, enabling the control system to determine the corresponding target operating condition based on changes in operating feedback data. When the identification result indicates that the operating state of the combined cycle unit has transitioned from the current target operating condition to another target operating condition, the economic operating control parameters under the corresponding operating condition are recalculated, and the unit operating state is adjusted according to the new control parameters to achieve automatic switching control between different operating conditions.

[0171] In one implementation, after updating the operating condition identification boundary, the control system acquires the operating characteristic quantities corresponding to the current operating state of the combined cycle unit. These operating characteristic quantities include energy change characteristics corresponding to the combustion heat release process, heat conversion characteristics corresponding to the flue gas waste heat transfer process, and energy utilization characteristics corresponding to the steam expansion work process.

[0172] The control system inputs the current operating characteristic quantities into the updated multi-condition identification process and matches the current operating characteristic quantities according to the adjusted identification boundaries. By comparing the correspondence between the current operating characteristic quantities and the corresponding characteristic sets of each target operating condition, the target operating condition to which the current operating state belongs is determined.

[0173] In the above scheme, the updated identification boundary is used to distinguish the operating characteristic range corresponding to different target operating conditions. Since the operating characteristic quantities change due to load changes, fuel supply changes, environmental parameter changes, and equipment operating status changes during the operation of the combined cycle unit, the operating characteristic quantities are rematched by adjusting the identification boundary to make the target operating condition judgment result correspond to the current unit operating status.

[0174] In one implementation, when the current operating characteristic quantity is still within the identification range corresponding to the original target operating condition, the control system maintains the current target operating condition and continues to execute the control process corresponding to the original economic operating control parameters.

[0175] When the current operating characteristic quantity exceeds the recognition range corresponding to the original target operating condition and enters the recognition range corresponding to another target operating condition, the control system determines that the current target operating condition has changed and calls the operating status data corresponding to the changed target operating condition.

[0176] In the above scheme, the economic operation control parameters are recalculated based on the changed target operating conditions. Specifically, the fuel supply parameters, air flow parameters, and steam flow parameters are recalculated based on the fuel consumption status, energy conversion efficiency status, and operational safety status corresponding to the new target operating conditions.

[0177] During the recalculation process, the control system coordinates and adjusts the fuel input state of the gas turbine, the air input state of the gas turbine, and the steam input state of the steam turbine according to the operating requirements corresponding to the new target operating conditions, so that the calculated economic operating control parameters match the new target operating conditions.

[0178] In the above scheme, the operating status of the combined cycle unit is adjusted according to the recalculated economic operating control parameters. The control system generates fuel supply regulation commands, air flow regulation commands, and steam flow regulation commands based on the new economic operating control parameters, and sends them to the fuel supply regulation device, air flow regulation device, and steam flow regulation device, respectively.

[0179] The fuel supply regulating device adjusts the fuel input status entering the gas turbine combustion system according to control commands; the air flow regulating device adjusts the air input status during the combustion process according to control commands; and the steam flow regulating device adjusts the steam input status entering the steam turbine according to control commands.

[0180] Through the above adjustment process, the energy transfer state between the gas turbine, waste heat boiler and steam turbine is adapted to the new target operating conditions, so that the operating state of the combined cycle unit is transformed from the original operating conditions to the new target operating conditions.

[0181] In one implementation, after completing the switching of operating conditions, the control system continues to collect operating feedback data of the combined cycle unit and updates the operating characteristic quantities based on the feedback data to determine whether the current operating state meets the requirements of the new target operating condition. When the operating state changes, the processes of matching operating characteristic quantities, determining the target operating condition, calculating economic operating control parameters, and adjusting operating parameters are repeated.

[0182] Through the aforementioned adaptive switching control process, the combined cycle unit can automatically adjust its control strategy according to changes in actual operating conditions, thereby enabling a continuous switching process between different operating conditions and improving the economical operation control capability under multi-condition operating conditions.

[0183] Example 10:

[0184] A combined cycle unit multi-condition economic operation intelligent control system is also provided, used to implement the steps of the combined cycle unit multi-condition economic operation intelligent control method, the system comprising:

[0185] The multi-source operation status data acquisition module is used to collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters and environmental parameters during the operation of the combined cycle unit, and construct a multi-source operation status dataset;

[0186] The thermo-coupling feature analysis module is used to perform feature analysis on the multi-source operating status dataset based on the energy coupling relationship between the combustion heat release process, flue gas waste heat transfer process and steam expansion work process in the combined cycle unit, and obtain operating feature quantities that reflect the thermo-coupling state of the unit.

[0187] The multi-condition identification module is used to identify the current operating status of the combined cycle unit based on the operating characteristic quantities and determine the corresponding target operating condition.

[0188] The economic operation parameter optimization module is used to calculate the economic operation control parameters under the corresponding operating conditions based on the target operating conditions, combined with fuel consumption, energy conversion efficiency and operating safety constraints.

[0189] The operation adjustment and control module is used to adjust the fuel supply, air flow and steam flow according to the economic operation control parameters, so as to migrate the operating state of the combined cycle unit to the target economic operating state.

[0190] The feedback update module is used to update the identification process in the multi-condition identification module based on the adjusted operation feedback data, so as to realize the adaptive economic operation control of the combined cycle unit under different operating conditions.

[0191] In the aforementioned scheme, the intelligent control system for multi-condition economic operation of the combined cycle unit achieves a closed-loop control process through data interaction between multiple functional modules, including combined cycle unit operating status acquisition, thermo-coupling characteristic analysis, operating condition identification, economic operating parameter calculation, equipment operation adjustment, and feedback updates. This system analyzes the energy conversion relationship between the gas turbine, waste heat boiler, and steam turbine, generates corresponding control parameters based on the unit's current operating status, and implements economic operation control of the combined cycle unit through control actuators.

[0192] In one embodiment, a multi-source operating status data acquisition module is connected to a detection device in the combined cycle unit to acquire real-time operating parameters during unit operation. The detection device includes data acquisition units located at the gas turbine system, waste heat boiler system, steam turbine system, and environmental monitoring locations.

[0193] The multi-source operation status data acquisition module collects gas turbine operating parameters, including fuel supply parameters, compressor operating parameters, and exhaust temperature parameters; it collects waste heat boiler operating parameters, including flue gas temperature parameters, steam generation parameters, and heat exchange status parameters; it collects steam turbine operating parameters, including steam flow parameters, pressure parameters, and load parameters; and it collects environmental parameters, including ambient temperature parameters and ambient pressure parameters.

[0194] The multi-source operation status data acquisition module performs time synchronization processing on the different types of operation parameters acquired, so that the operation parameters of different devices at the same time node form a data set, and sends the processed data to the thermal coupling feature analysis module.

[0195] In the above scheme, the thermo-coupling feature analysis module is used to perform feature processing on the multi-source operating status dataset. This module analyzes the collected data based on the energy transfer relationships between the combustion heat release process, flue gas waste heat transfer process, and steam expansion work process within the combined cycle unit.

[0196] Specifically, the thermo-coupling feature analysis module analyzes the energy change characteristics corresponding to the combustion heat release process based on the gas turbine fuel supply parameters and exhaust temperature parameters; analyzes the heat conversion characteristics corresponding to the flue gas waste heat transfer process based on the waste heat boiler flue gas temperature parameters and steam generation parameters; and analyzes the energy utilization characteristics corresponding to the steam expansion work process based on the steam turbine steam flow rate parameters, pressure parameters, and load parameters.

[0197] The thermo-coupling feature analysis module integrates the above-mentioned energy change features, heat conversion features, and energy utilization features to form operating feature quantities that reflect the thermo-coupling state of the combined cycle unit, and sends the operating feature quantities to the multi-condition identification module.

[0198] In the above scheme, the multi-condition identification module is used to determine the target operating condition corresponding to the current operating state of the combined cycle unit based on operating characteristic quantities. This module internally stores a set of operating condition characteristics corresponding to different operating states, and the set of operating condition characteristics includes operating characteristic quantities corresponding to different target operating conditions.

[0199] When the multi-condition identification module receives the operating feature quantity corresponding to the current operating state, it matches the current operating feature quantity with the operating condition feature set, determines the target operating condition corresponding to the current combined cycle unit based on the matching result, and sends the target operating condition to the economic operating parameter optimization module.

[0200] In the above scheme, the economic operation parameter optimization module is used to calculate the economic operation control parameters based on the target operating conditions. This module optimizes the fuel supply parameters, air flow parameters, and steam flow parameters according to the fuel consumption status, energy conversion efficiency status, and operating safety status corresponding to the target operating conditions.

[0201] Among them, the economic operation parameter optimization module determines the fuel supply adjustment demand based on the fuel consumption status, determines the energy conversion process control demand based on the energy conversion efficiency status, and determines the equipment operation constraints based on the operation safety status, and finally generates the economic operation control parameters corresponding to the target operating conditions.

[0202] In the above scheme, the operation regulation and control module is used to execute the control operations corresponding to the economic operation control parameters. This module generates fuel supply regulation commands, air flow regulation commands, and steam flow regulation commands based on the economic operation control parameters, and sends them to the fuel supply regulation device, air flow regulation device, and steam flow regulation device, respectively.

[0203] The fuel supply regulating device adjusts the fuel input status of the gas turbine according to control commands; the air flow regulating device adjusts the air input status during the combustion process according to control commands; and the steam flow regulating device adjusts the steam input status of the steam turbine according to control commands, so that the combined cycle unit's operating status is converted to the target economic operating status.

[0204] In the above scheme, the feedback update module is used to obtain operational feedback data after the operation adjustment and control module performs control operations. The operational feedback data includes adjusted gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters.

[0205] The feedback update module performs feature analysis on the operation feedback data, compares the adjusted operation feature quantity with the set of operating condition features corresponding to the original target operating condition, and updates the recognition process in the multi-operating condition recognition module based on the comparison results.

[0206] Specifically, the feedback update module analyzes the state change relationship between different operating conditions based on the operating feedback data corresponding to different target operating conditions, and adjusts the identification boundary between target operating conditions, so that the multi-condition identification module can rematch the target operating condition corresponding to the current operating state based on the updated identification boundary.

[0207] When the feedback update module detects a change in the target operating condition corresponding to the current operating state, it sends the changed target operating condition to the economic operating parameter optimization module, which then recalculates the economic operating control parameters and executes the corresponding adjustment operation through the operation adjustment control module.

[0208] Through the data transmission relationship between the above modules, a closed-loop control system is formed, consisting of operating status acquisition, thermo-coupling analysis, operating condition identification, parameter optimization, operation adjustment, and feedback updates. This enables the combined cycle unit to execute corresponding control strategies according to changes in actual operating status, achieving adaptive and economical operation control under different operating conditions.

[0209] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A smart control method for multi-condition economic operation of a combined cycle power unit, characterized in that, include: Collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters during the operation of the combined cycle unit to construct a multi-source operating status dataset; Based on the energy coupling relationship between the combustion heat release process, the flue gas waste heat transfer process, and the steam expansion work process in the combined cycle unit, feature analysis is performed on the multi-source operating status dataset to obtain operating characteristic quantities that reflect the thermodynamic coupling state of the unit. Based on operating characteristic quantities, the current operating status of the combined cycle unit is identified under multiple operating conditions to determine the corresponding target operating condition. Based on the target operating conditions, and taking into account fuel consumption, energy conversion efficiency and operating safety constraints, the economic operating control parameters under the corresponding operating conditions are calculated. Adjust fuel supply, air flow and steam flow according to economic operation control parameters to shift the operating state of the combined cycle unit toward the target economic operating state. The multi-condition identification process is updated based on the adjusted operation feedback data to achieve adaptive economic operation control of the combined cycle unit under different operating conditions.

2. The intelligent control method for multi-condition economic operation of a combined cycle power unit according to claim 1, characterized in that: The parameters of the gas turbine, waste heat boiler, steam turbine, and environmental parameters collected during the operation of the combined cycle unit are used to construct a multi-source operating status dataset, including: Acquire fuel supply parameters, compressor operating parameters, and exhaust temperature parameters during the operation of the gas turbine; Acquire flue gas temperature parameters, steam generation parameters, and heat exchange status parameters during the operation of the waste heat boiler; Obtain steam flow rate, pressure, and load parameters during the operation of the steam turbine; Obtain the ambient temperature and ambient pressure parameters from the environmental parameters; The gas turbine parameters, waste heat boiler parameters, steam turbine parameters, and environmental parameters are synchronized over time to form the multi-source operating status dataset.

3. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 2, characterized in that: Based on the energy coupling relationship between the combustion heat release process, flue gas waste heat transfer process, and steam expansion work process in the combined cycle unit, feature analysis is performed on the multi-source operating state dataset to obtain operating characteristic quantities reflecting the thermodynamic coupling state of the unit, including: Based on the fuel supply parameters and exhaust temperature parameters in the gas turbine parameters, analyze the energy change characteristics corresponding to the combustion heat release process; Based on the flue gas temperature parameters and steam generation parameters in the waste heat boiler parameters, analyze the heat conversion characteristics corresponding to the flue gas waste heat transfer process. Based on the steam flow rate, pressure, and load parameters in the steam turbine parameters, analyze the energy utilization characteristics corresponding to the steam expansion and work process. The operational characteristic quantities are obtained by integrating the energy change characteristics, heat conversion characteristics, and energy utilization characteristics.

4. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 3, characterized in that: The process of identifying multiple operating conditions of the combined cycle unit based on operating characteristic quantities and determining the corresponding target operating condition includes: Establish a set of operating condition features corresponding to different operating states based on the aforementioned operating characteristic quantities; Match the operating characteristic quantities corresponding to the current operating status of the combined cycle unit with the set of operating condition characteristics; The target operating condition corresponding to the current combined cycle unit is determined based on the matching results.

5. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 4, characterized in that: The process involves calculating the economic operation control parameters for the corresponding operating conditions based on the target operating conditions, combined with fuel consumption, energy conversion efficiency, and operational safety constraints. This includes: Obtain the corresponding fuel consumption status, energy conversion efficiency status, and operational safety status based on the target operating conditions; Based on the fuel consumption status, energy conversion efficiency status, and operational safety status, the parameters of fuel supply, air flow rate, and steam flow rate are optimized. The economic operation control parameters are obtained based on the parameter optimization results.

6. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 5, characterized in that: The method of adjusting fuel supply, air flow, and steam flow according to economic operation control parameters to shift the operating state of the combined cycle unit towards the target economic operating state includes: Based on the economic operation control parameters, fuel supply regulation commands, air flow regulation commands, and steam flow regulation commands are generated. Adjust the gas turbine fuel input status according to the fuel supply regulation command; The air input state during combustion is adjusted according to the air flow regulation command; Adjusting the steam input state of the steam turbine according to the steam flow regulation command, so that the combined cycle unit's operating state shifts towards the target economic operating state.

7. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 6, characterized in that: The process of updating the multi-condition identification based on the adjusted operational feedback data includes: Acquire operational feedback data after adjusting fuel supply, air flow, and steam flow; The operational feedback data is compared with the operational characteristic quantities of the corresponding target operating condition before adjustment; The set of operating condition features for the corresponding target operating condition is updated based on the comparison results to improve the adaptability of the multi-condition identification process to changes in the operating status of the combined cycle unit.

8. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 7, characterized in that: The process of updating the multi-condition identification based on operational feedback data also includes: Based on the operational feedback data corresponding to different target operating conditions, obtain the state change relationship between different target operating conditions; Adjust the identification boundary between target operating conditions based on the aforementioned state change relationship; The multi-condition recognition process is updated based on the adjusted recognition boundaries.

9. The intelligent control method for multi-condition economic operation of a combined cycle unit according to claim 8, characterized in that: The multi-condition identification process based on the adjusted identification boundary update includes: Rematch the operating characteristic quantities corresponding to the current operating status of the combined cycle unit based on the updated identification boundaries; When the target operating condition corresponding to the current operating characteristic changes, the economic operating control parameters are recalculated based on the changed target operating condition. The operating status of the combined cycle unit is adjusted according to the recalculated economic operating control parameters to achieve adaptive switching control between different operating conditions.

10. A multi-condition economic operation intelligent control system for a combined cycle power unit, used to implement the steps of the multi-condition economic operation intelligent control method for a combined cycle power unit as described in any one of claims 1-9, characterized in that, The system includes: The multi-source operation status data acquisition module is used to collect gas turbine parameters, waste heat boiler parameters, steam turbine parameters and environmental parameters during the operation of the combined cycle unit, and construct a multi-source operation status dataset; The thermo-coupling feature analysis module is used to perform feature analysis on the multi-source operating status dataset based on the energy coupling relationship between the combustion heat release process, flue gas waste heat transfer process and steam expansion work process in the combined cycle unit, and obtain operating feature quantities that reflect the thermo-coupling state of the unit. The multi-condition identification module is used to identify the current operating status of the combined cycle unit based on the operating characteristic quantities and determine the corresponding target operating condition. The economic operation parameter optimization module is used to calculate the economic operation control parameters under the corresponding operating conditions based on the target operating conditions, combined with fuel consumption, energy conversion efficiency and operating safety constraints. The operation adjustment and control module is used to adjust the fuel supply, air flow and steam flow according to the economic operation control parameters, so as to migrate the operating state of the combined cycle unit to the target economic operating state. The feedback update module is used to update the identification process in the multi-condition identification module based on the adjusted operation feedback data, so as to realize the adaptive economic operation control of the combined cycle unit under different operating conditions.

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