Control method of gas turbine combined cycle heat and power cogeneration system and related device

Abstract

The application discloses a control method and related device of a gas turbine combined cycle heat and power cogeneration system, and is based on a full working condition model and a reheat boiler model of the gas turbine combined cycle heat and power cogeneration system. The heat and power operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different reheat temperatures is obtained. According to the heat and power load demand of the user side, the preferred operation scheme containing the variable condition adjustment mode and the reheat temperature is determined in the heat and power operation domain, that is, the operation scheme combined with the appropriate reheat temperature and the variable condition adjustment mode is matched according to the load demand. According to the preferred operation scheme, the gas turbine combined cycle heat and power cogeneration system is controlled, the heat supply flexibility of the gas turbine combined cycle system can be greatly improved, and when the heat supply demand is met, the power generation load of the gas turbine combined cycle heat and power cogeneration system is greatly reduced, and the renewable energy consumption space of the unit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a control method and related device of a gas turbine combined cycle heat and power cogeneration system, and belongs to the technical field of gas power generation. BACKGROUND

[0002] Under the background of double carbon, the proportion of renewable energy in the energy proportion is increasing, and renewable energy has the characteristics of intermittency and volatility, which will have a huge impact on the safe operation of the power grid. The gas turbine has the advantage of fast regulation rate and can be used to smooth the fluctuations of renewable energy.

[0003] Reference Figure 1 The current gas turbine combined cycle heat and power cogeneration system generally includes a supplementary combustion waste heat boiler. The supplementary combustion waste heat boiler installs a supplementary combustion device at the inlet, uses the internal space as a combustion chamber, and increases the flue gas temperature entering the waste heat boiler by supplementary combustion of fuel. At the same time, the supplementary combustion waste heat boiler can adjust the flue gas temperature by adjusting the amount of fuel in the supplementary combustion device, so as to ensure the steam production of the waste heat boiler when the load of the gas turbine is reduced, thereby ensuring the heat supply capacity of the gas turbine combined cycle heat and power cogeneration system. However, the gas turbine combined cycle heat and power cogeneration unit is often operated in a "heat determines electricity" mode, which will reduce the heat supply flexibility of the gas turbine combined cycle heat and power cogeneration system. SUMMARY

[0004] The present application provides a control method and related device of a gas turbine combined cycle heat and power cogeneration system, which solves the problems disclosed in the background art.

[0005] According to one aspect of the present disclosure, a control method of a gas turbine combined cycle heat and power cogeneration system is provided, comprising:

[0006] According to the full working condition model of the gas turbine combined cycle heat and power cogeneration system, the flue gas flow variation under different variable condition adjustment modes of the gas turbine under different electrical loads is obtained;

[0007] According to the model of the supplementary combustion waste heat boiler in the gas turbine combined cycle heat and power cogeneration system and the flue gas flow variation, the steam production variation of the supplementary combustion waste heat boiler under different supplementary combustion temperatures is obtained;

[0008] According to the flue gas flow variation and the steam production variation, the variable condition heat and electrical load variation of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different supplementary combustion temperatures is obtained;

[0009] According to the variable condition heat and electrical load variation, the heat and electrical operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different supplementary combustion temperatures is obtained;

[0010] According to the heat and electricity load demand of the user side, an optimal operation scheme containing a variable working condition adjustment mode and a reheat temperature is obtained in a heat and electricity operation domain, and a gas turbine combined cycle heat and electricity cogeneration system is controlled according to the optimal operation scheme.

[0011] In some embodiments of the present disclosure, the full working condition model of the gas turbine combined cycle heat and electricity cogeneration system includes a combustion chamber model and a gas turbine model.

[0012] The combustion chamber model is:

[0013] ;

[0014] In the formula, β is an excess air coefficient, L is a theoretical air quantity, are flue gas enthalpy values at a combustion chamber outlet and a compressor inlet, respectively, are fuel enthalpy values at a compressor outlet and a compressor inlet, respectively, are air enthalpy values at the compressor outlet and the compressor inlet, respectively, is an efficiency of the combustion chamber, and LHV is a low heat value;

[0015] The gas turbine model is:

[0016] ;

[0017] In the formula, k is a constant, A is a turbine inlet area, m is a flue gas flow rate at a gas turbine inlet, T is a flue gas temperature at the gas turbine inlet, p is a flue gas pressure at the gas turbine inlet, and const is a constant value.

[0018] In some embodiments of the present disclosure, a model of a reheat type waste heat boiler in the gas turbine combined cycle heat and electricity cogeneration system is:

[0019] ;

[0020] ;

[0021] In the formula, m g is a flue gas flow rate, m s is a steam flow rate, c p is a specific heat capacity, ΔT is a logarithmic heat exchange temperature difference, (UA) p is an overall heat surface heat exchange coefficient, T g1 is a flue gas temperature at an inlet of the reheat type waste heat boiler, T g2 is a flue gas temperature at an outlet of the reheat type waste heat boiler, h s1 is an inlet enthalpy of steam / water, h s2 is an outlet enthalpy of steam / water, T s1 is an inlet temperature of steam / water, and T s2 is an outlet temperature of steam / water.

[0022] In some embodiments of this disclosure, based on user-side heat and electricity load demands, a preferred operating scheme is obtained in the thermoelectric operating domain, including variable operating condition regulation methods and combustion temperature, including:

[0023] Identify all operating schemes that meet the user-side heat and electricity load demands within the cogeneration operating domain; among them, the operating schemes are those for gas turbine combined cycle cogeneration systems.

[0024] If all operating schemes are traversed, and the operating scheme whose corresponding electrical load is closest to the electrical load demand and whose corresponding thermal load is closest to the thermal load demand is selected as the preferred operating scheme, then the operating scheme is selected as the preferred operating scheme.

[0025] According to another aspect of this disclosure, a control device for a gas turbine combined cycle cogeneration system is provided, comprising:

[0026] The flue gas flow module obtains the flue gas flow changes of the gas turbine under different electrical loads and different variable operating conditions based on the full-condition model of the gas turbine combined cycle cogeneration system.

[0027] The steam production module obtains the steam production changes of the supplementary combustion waste heat boiler under different supplementary combustion temperatures, based on the model and flue gas flow changes of the supplementary combustion waste heat boiler in the gas turbine combined cycle cogeneration system.

[0028] The load module obtains the changes in heat and electricity load of the gas turbine combined cycle cogeneration system under different operating conditions and different combustion temperatures, based on changes in flue gas flow and steam production.

[0029] The cogeneration operation domain module obtains the cogeneration operation domain of the gas turbine combined cycle cogeneration system under different variable operating conditions and different supplementary combustion temperatures, based on the changes in heat and electricity load under varying operating conditions.

[0030] The optimal control module obtains the preferred operating scheme, including variable operating condition adjustment mode and combustion temperature, in the cogeneration operating domain based on the user's heat and electricity load demand, and controls the gas turbine combined cycle cogeneration system according to the preferred operating scheme.

[0031] In some embodiments of this disclosure, the full-condition model of the gas turbine combined cycle cogeneration system in the flue gas flow module includes a combustion chamber model and a gas turbine model;

[0032] The combustion chamber model is as follows:

[0033] ;

[0034] In the formula, β is the excess air coefficient, and L is the theoretical air volume. Flue gas enthalpy at the combustor outlet and the compressor inlet, respectively, Fuel enthalpy at the compressor outlet and the compressor inlet, respectively, Air enthalpy at the compressor outlet and the compressor inlet, respectively, Efficiency of the combustor, LHV is low heat value;

[0035] The gas turbine model is:

[0036] ;

[0037] wherein k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant value.

[0038] In some embodiments of the present disclosure, in the steam production module, the model of the supplementary fired waste heat boiler in the gas turbine combined cycle cogeneration system is:

[0039] ;

[0040] ;

[0041] wherein m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic mean temperature difference, (UA) p is the overall heat surface heat transfer coefficient, T g1 is the flue gas temperature at the inlet of the supplementary fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary fired waste heat boiler, h s1 is the inlet enthalpy of the steam / water, h s2 is the outlet enthalpy of the steam / water, T s1 is the inlet temperature of the steam / water, and T s2 is the outlet temperature of the steam / water.

[0042] In some embodiments of the present disclosure, in the optimization control module, an optimal operation scheme containing a variable working condition adjustment mode and a supplementary firing temperature is obtained in a thermal power operation domain according to user-side thermal and electric load demands, including:

[0043] All operation schemes satisfying the user-side thermal and electric load demands are found out from the thermal power operation domain; wherein the operation scheme is an operation scheme of the gas turbine combined cycle cogeneration system;

[0044] All operation schemes are traversed, and if the electric load corresponding to the operation scheme is closest to the electric load demand and the thermal load corresponding to the operation scheme is closest to the thermal load demand, the operation scheme is taken as the optimal operation scheme.

[0045] According to another aspect of the present disclosure, a computer-readable storage medium is provided, the computer-readable storage medium storing one or more programs including instructions that, when executed by a computing device, cause the computing device to perform a control method of a gas turbine combined cycle heat and power cogeneration system.

[0046] According to another aspect of the present disclosure, a computer device is provided, comprising one or more processors, and one or more memories, one or more programs being stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing a control method of a gas turbine combined cycle heat and power cogeneration system.

[0047] The present application has the following beneficial effects: Based on the full working condition model of the gas turbine combined cycle heat and power cogeneration system and the reheat boiler model, the heat and power operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different reheat temperatures is obtained, the preferred operation scheme containing the variable condition adjustment mode and the reheat temperature is determined in the heat and power operation domain according to the user-side heat and power load demand, that is, the operation scheme combining the appropriate reheat temperature and the variable condition adjustment mode is matched according to the load demand, and the gas turbine combined cycle heat and power cogeneration system is controlled according to the preferred operation scheme, which can greatly improve the heat supply flexibility of the gas turbine combined cycle system, and greatly reduce the power generation load of the gas turbine combined cycle heat and power cogeneration system when meeting the heat supply demand, thereby improving the renewable energy consumption space of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 Fig. 1 is a structural schematic diagram of a gas turbine combined cycle heat and power cogeneration system;

[0049] Figure 2 Fig. 4 is a flow chart of a control method of a gas turbine combined cycle heat and power cogeneration system;

[0050] Figure 3 Fig. 5 is a first heat and power operation domain;

[0051] Figure 4 Fig. 6 is a second heat and power operation domain;

[0052] Figure 5 Fig. 7 is a block diagram of a gas turbine combined cycle heat and power cogeneration device. DETAILED DESCRIPTION

[0053] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0054] Unless otherwise stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0055] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0056] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0057] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0058] It should be noted that similar symbols and letters in the following figures represent similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0059] To address the issue that the "heat-driven power generation" approach reduces the heating flexibility of gas turbine combined cycle cogeneration systems, this disclosure proposes a control method and related devices for gas turbine combined cycle cogeneration systems. Specifically, it proposes an operation scheme that combines appropriate supplementary combustion temperature with variable operating condition adjustment based on the user's heat and electricity load requirements.

[0060] Figure 1 This is a schematic diagram of an embodiment of the control method for a gas turbine combined cycle cogeneration system disclosed herein. Figure 1 The implementation can be executed by the control server of the gas turbine combined cycle cogeneration system.

[0061] like Figure 1 As shown, in step 1 of the embodiment, the flue gas flow rate changes of the gas turbine under different electrical loads and different variable operating conditions are obtained based on the full operating condition model of the gas turbine combined cycle cogeneration system.

[0062] It should be noted that the commonly used variable condition adjustment mode of the gas turbine includes an equal T3-equal T4 adjustment mode and an equal T3 adjustment mode; wherein the equal T3-equal T4 adjustment mode is: starting from 100% gas turbine load to reduce the load, at this time, the IGV (inlet guide vane) is adjusted to keep T3 (the gas turbine inlet flue gas temperature) unchanged, when the IGV is adjusted to the maximum opening, at this time, T4 (the gas turbine outlet flue gas temperature) is kept unchanged, and finally the load is continuously reduced by adjusting the combustion chamber fuel quantity; the equal T3 adjustment mode is: starting from 100% gas turbine load to reduce the load, at this time, the IGV (inlet guide vane) is adjusted to keep T3 (the gas turbine inlet flue gas temperature) unchanged, when the IGV is adjusted to the maximum opening, at this time, only the combustion chamber fuel quantity is adjusted to continuously reduce the load. Different adjustment modes have different flue gas temperatures and flue gas flow rates entering the waste heat boiler under different gas turbine loads, and thus different adjustment modes can be selected under different heat and power load demands.

[0063] It should be noted that the full condition model of the gas turbine combined cycle heat and power cogeneration system mainly includes a combustion chamber model and a gas turbine model.

[0064] The combustion chamber model can be:

[0065] ;

[0066] In the formula, β is an excess air coefficient, L is a theoretical air quantity, are flue gas enthalpy values at the combustion chamber outlet and the compressor inlet respectively, are fuel enthalpy values at the compressor outlet and the compressor inlet respectively, are air enthalpy values at the compressor outlet and the compressor inlet respectively, is an efficiency of the combustion chamber, and LHV is a low heat value;

[0067] The gas turbine model can be:

[0068] ;

[0069] In the formula, k is a constant, A is a turbine inlet area, m is a flue gas flow rate at the gas turbine inlet, T is a flue gas temperature at the gas turbine inlet, p is a flue gas pressure at the gas turbine inlet, and const is a constant value.

[0070] Based on the above model, in the equal T3-equal T4 regulation mode, first, the IGV (inlet guide vane) is adjusted to keep T3 unchanged when the load is reduced, at this time, based on the compressor flow characteristic curve and combined with the fuel quantity of the combustion chamber, the matching compressor pressure ratio and compressor air flow are obtained, the flue gas flow is obtained, and the IGV opening reaches the maximum, at this time, T4 is kept unchanged, at this time, based on the compressor flow characteristic curve and combined with the fuel quantity of the combustion chamber, the flue gas flow is obtained, finally, the load is reduced by adjusting the fuel quantity, at this time, based on the compressor flow characteristic curve and combined with the fuel quantity of the combustion chamber, the flue gas flow is obtained. The flue gas flow obtaining method of the equal T3 regulation mode is similar to that of the equal T3-equal T4 regulation mode.

[0071] Return Figure 1 , in step 2 of the embodiment, according to the model of the supplementary fired waste heat boiler in the gas turbine combined cycle heat and power cogeneration system and the flue gas flow change, the steam production change of the supplementary fired waste heat boiler under different supplementary combustion temperatures is obtained.

[0072] It should be noted that the waste heat boiler, as the name implies, is a boiler that uses the heat of waste gas, waste material or waste liquid in various industrial processes and the heat generated after the combustion of combustible substances to heat water to a certain temperature.

[0073] The model of the supplementary fired waste heat boiler can be expressed as:

[0074] ;

[0075] ;

[0076] In the formula, m g is the flue gas flow, m s is the steam flow, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat surface heat transfer coefficient, T g1 is the inlet flue gas temperature of the supplementary fired waste heat boiler, T g2 is the outlet flue gas temperature of the supplementary fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the inlet temperature of steam / water, T s2 is the outlet temperature of steam / water.

[0077] Based on the flue gas parameters at the inlet of the waste heat boiler, the steam production of each heat transfer surface in the waste heat boiler is calculated according to the waste heat boiler model combined with the steam turbine steam pressure and temperature design curve under variable load, that is, the total steam production of the waste heat boiler is obtained.

[0078] Return Figure 1, the step 3 of the embodiment, according to the flue gas flow variation and the steam production variation, the variable condition heat and electric load variation of the gas turbine combined cycle heat and power supply system under different variable condition adjustment modes and different supplementary combustion temperatures is obtained.

[0079] The gas turbine power generation can be obtained according to the flue gas flow in combination with the gas turbine model and the combustion chamber model, the steam turbine power generation and the heat supply can be obtained according to the steam production in combination with the steam turbine model, and the variable condition heat and electric load variation of the gas turbine combined cycle heat and power supply system under different variable condition adjustment modes and different supplementary combustion temperatures is obtained based on this.

[0080] Return Figure 1 , the step 4 of the embodiment, the heat and electric operation domain of the gas turbine combined cycle heat and power supply system under different variable condition adjustment modes and different supplementary combustion temperatures is obtained according to the variable condition heat and electric load variation.

[0081] Specifically, the heat and electric operation domain is drawn according to the heat and electric load variation under different variable condition adjustment modes and different supplementary combustion temperatures.

[0082] The heat and electric operation domain can be seen from Figure 3 and Figure 4 , wherein, Figure 3 The described is the electric load variation range under the condition of meeting the heat load under the equal T3 adjustment mode and different supplementary combustion temperatures, and the area contained in the graph is taken as the heat and electric operation domain; Figure 4 The described is the equal T3-equal T4 adjustment mode.

[0083] Return Figure 1 , the step 5 of the embodiment, the preferred operation scheme containing the variable condition adjustment mode and the supplementary combustion temperature is obtained in the heat and electric operation domain according to the user side heat and electric load demand, and the gas turbine combined cycle heat and power supply system control is performed according to the preferred operation scheme.

[0084] It should be noted that the preferred operation scheme is: under a certain operation scheme, the heat and electric load generated by the generator set is closest to the user heat and electric load demand at the same time.

[0085] The process of determining the preferred operation scheme can be:

[0086] 1) All operation schemes meeting the user side heat and electric load demand are found out from the heat and electric operation domain; wherein, the operation scheme is the operation scheme of the gas turbine combined cycle heat and power supply system;

[0087] 2) All operation schemes are traversed, if the electric load corresponding to the operation scheme is closest to the electric load demand, and the heat load corresponding to the operation scheme is closest to the heat load demand, the operation scheme is taken as the preferred operation scheme.

[0088] The conventional operation mode of the cogeneration unit is "determining electricity according to heat", in which mode, during some time periods, such as at night, the ambient temperature is low, the heat supply demand of the unit is large, but the power grid has low demand for power generation of the unit, but in order to ensure the heat supply demand of the unit, the unit is forced to increase the power generation, which reduces the renewable energy consumption of the power grid and causes the phenomenon of wind curtailment to be obvious. Therefore, the preferred operation scheme can make the unit match the heat and electricity demand of the user side as much as possible, greatly improve the heat supply flexibility, and provide a large amount of renewable energy consumption for the power grid.

[0089] The following describes the implementation effect of the above method in combination with the actual production:

[0090] For example, when providing a heat load of 150 MW, the minimum power generation of the equal T3 adjustment strategy is 270 MW, the minimum power generation of the equal T3-T4 adjustment strategy is 225 MW, the minimum power generation of the equal T3-supplementary combustion adjustment strategy is 175 MW, and the minimum power generation of the equal T4-supplementary combustion adjustment strategy is 150 MW; and when providing a heat load of 200 MW, the minimum power generation of the equal T3 adjustment strategy is 325 MW, the minimum power generation of the equal T3-T4 adjustment strategy is 325 MW, the minimum power generation of the equal T3-T4-supplementary combustion adjustment strategy is 200 MW, and the minimum power generation of the equal T3-supplementary combustion adjustment strategy is 170 MW. Therefore, it can be known that based on the above method, after the supplementary combustion type waste heat boiler is used, the heat supply capacity of the gas turbine combined cycle cogeneration system is greatly improved in the low load region of the gas turbine.

[0091] When the heat supply is 0-100 MW, the minimum power generation of the system is in the T3 adjustment strategy operation mode; when the heat supply is 100-120 MW, the minimum power generation of the system is in the T3-T4 adjustment strategy operation mode; when the heat supply is 120-190 MW, the minimum power generation of the system is in the T3-T4-supplementary combustion adjustment strategy operation mode; and when the heat supply is 190-250 MW, the minimum power generation of the system is in the T3-supplementary combustion adjustment strategy operation mode. Therefore, it can be known that based on the above method, in different heat supply load intervals, different operation strategies can greatly reduce the power generation of the gas turbine combined cycle cogeneration system and improve the renewable energy consumption capacity of the unit.

[0092] The above method obtains the thermal and electric operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different reheat temperatures based on a full condition model of the gas turbine combined cycle heat and power cogeneration system and a reheat boiler model, determines an optimal operation scheme containing the variable condition adjustment mode and the reheat temperature in the thermal and electric operation domain according to the user-side heat and electric load demand, that is, combines the operation scheme of the appropriate reheat temperature and the variable condition adjustment mode according to the load demand, and controls the gas turbine combined cycle heat and power cogeneration system according to the optimal operation scheme, so that the heat supply flexibility of the gas turbine combined cycle system can be greatly improved. Under the cooperative operation of the reheat boiler and the variable condition flexible adjustment strategy, the electric load of the gas turbine combined cycle heat and power cogeneration system can be greatly reduced while meeting the heat supply demand, so as to improve the renewable energy consumption space of the unit.

[0093] Figure 5 FIG. 1 is a schematic diagram of an embodiment of the gas turbine combined cycle heat and power cogeneration device of the present disclosure, Figure 5 The embodiment is a virtual device, which can be loaded and executed by a control server of the gas turbine combined cycle heat and power cogeneration system, and includes a flue gas flow module, a steam production amount module, a load module, a thermal and electric operation domain module and an optimal selection control module.

[0094] The flue gas flow module of the embodiment is configured to obtain the flue gas flow variation of the gas turbine under different variable condition adjustment modes at different electric loads according to a full condition model of the gas turbine combined cycle heat and power cogeneration system.

[0095] It should be noted that in the flue gas flow module, the full condition model of the gas turbine combined cycle heat and power cogeneration system mainly includes a combustion chamber model and a gas turbine model.

[0096] The combustion chamber model can be expressed as:

[0097] ;

[0098] In the formula, β is the excess air coefficient, L is the theoretical air quantity, are the flue gas enthalpy values at the outlet of the combustion chamber and the inlet of the compressor, respectively, are the fuel enthalpy values at the outlet of the compressor and the inlet of the compressor, respectively, are the air enthalpy values at the outlet of the compressor and the inlet of the compressor, respectively, is the efficiency of the combustion chamber, and LHV is the low heat value.

[0099] The gas turbine model can be expressed as:

[0100] ;

[0101] Wherein, k is a constant, A is a turbine inlet area, m is a flue gas flow rate at the gas turbine inlet, T is a flue gas temperature at the gas turbine inlet, p is a flue gas pressure at the gas turbine inlet, and const is a constant value.

[0102] The steam production module of the embodiment is configured to obtain the steam production variation of the supplemental-fired waste heat boiler at different supplemental combustion temperatures according to the model of the supplemental-fired waste heat boiler in the gas turbine combined cycle heat and power cogeneration system and the flue gas flow rate variation.

[0103] It should be noted that in the steam production module, the model of the supplemental-fired waste heat boiler in the gas turbine combined cycle heat and power cogeneration system can be expressed as:

[0104] ;

[0105] ;

[0106] Wherein, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat surface heat transfer coefficient, T g1 is the flue gas temperature at the inlet of the supplemental-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplemental-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the inlet temperature of steam / water, and T s2 is the outlet temperature of steam / water.

[0107] The load module of the embodiment is configured to obtain the variable condition heat and electric load variation of the gas turbine combined cycle heat and power cogeneration system at different variable condition adjustment modes and different supplemental combustion temperatures according to the flue gas flow rate variation and the steam production variation.

[0108] The heat and power operation domain module of the embodiment is configured to obtain the heat and power operation domain of the gas turbine combined cycle heat and power cogeneration system at different variable condition adjustment modes and different supplemental combustion temperatures according to the variable condition heat and electric load variation.

[0109] The optimal control module of the embodiment is configured to obtain an optimal operation scheme containing a variable condition adjustment mode and a supplemental combustion temperature in the heat and power operation domain according to the user-side heat and electric load demand, and to control the gas turbine combined cycle heat and power cogeneration system according to the optimal operation scheme.

[0110] It should be noted that the optimal operation scheme is a scheme in which the heat and electric load generated by the generator set is closest to the user-side heat and electric load demand at the same time under a certain operation scheme.

[0111] The process of determining the preferred operation scheme can be:

[0112] 1) find all operation schemes that meet the user-side heat and electricity load demand from the heat and electricity operation domain; wherein the operation scheme is the operation scheme of the gas turbine combined cycle heat and power cogeneration system.

[0113] 2) traverse all operation schemes, if the electricity load corresponding to the operation scheme is closest to the electricity load demand, and the heat load corresponding to the operation scheme is closest to the heat load demand, then the operation scheme is taken as the preferred operation scheme.

[0114] Similar to the above method, the device obtains the heat and electricity operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable condition adjustment modes and different supplementary combustion temperatures based on the full working condition model of the gas turbine combined cycle heat and power cogeneration system and the supplementary combustion waste heat boiler model, determines the preferred operation scheme containing the variable condition adjustment mode and the supplementary combustion temperature in the heat and electricity operation domain according to the user-side heat and electricity load demand, that is, according to the load demand, a suitable supplementary combustion temperature and a variable condition adjustment mode combined operation scheme, and controls the gas turbine combined cycle heat and power cogeneration system according to the preferred operation scheme, which can greatly improve the heating flexibility of the gas turbine combined cycle system. Under the cooperative operation of the supplementary combustion waste heat boiler and the variable condition flexible adjustment strategy, the electricity load of the gas turbine combined cycle heat and power cogeneration system is greatly reduced while meeting the heating demand, which improves the renewable energy consumption space of the unit.

[0115] Based on the same technical scheme, the present disclosure also relates to a computer readable storage medium, which stores one or more programs, and the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform the control method of the gas turbine combined cycle heat and power cogeneration system.

[0116] Based on the same technical scheme, the present disclosure also relates to a computer device, which includes one or more processors and one or more memories, and one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing the control method of the gas turbine combined cycle heat and power cogeneration system.

[0117] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer usable program code.

[0118] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps in one or more flowcharts and / or blocks

[0119] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps in one or more flowcharts and / or blocks

[0120] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps in one or more flowcharts and / or blocks

[0121] The above merely provides an embodiment of the present application, but is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall within the scope of the claims of the present application.

Claims

1. A control method for a gas turbine combined cycle cogeneration system, characterized by, The method comprises the following steps: According to the full working condition model of the gas turbine combined cycle heat and power cogeneration system, the flue gas flow variation of the gas turbine under different variable working condition adjustment modes and different electrical loads is obtained; According to the model of the supplementary combustion type waste heat boiler in the gas turbine combined cycle heat and power cogeneration system and the flue gas flow variation, the steam production variation of the supplementary combustion type waste heat boiler under different supplementary combustion temperatures is obtained; According to the flue gas flow variation and the steam production variation, the variable working condition thermal and electrical load variation of the gas turbine combined cycle heat and power cogeneration system under different variable working condition adjustment modes and different supplementary combustion temperatures is obtained; According to the variable working condition thermal and electrical load variation, the thermal and electrical operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable working condition adjustment modes and different supplementary combustion temperatures is obtained; According to the user side thermal and electrical load demand, an optimal operation scheme containing the variable working condition adjustment mode and the supplementary combustion temperature is obtained in the thermal and electrical operation domain, and the gas turbine combined cycle heat and power cogeneration system is controlled according to the optimal operation scheme; The full working condition model of the above-mentioned gas turbine combined cycle heat and power cogeneration system comprises a combustion chamber model and a gas turbine model; The combustion chamber model is as follows: where β is the excess air ratio, L is the theoretical air quantity, respectively the flue gas enthalpy at the combustor outlet and the compressor inlet, respectively the fuel enthalpy at the compressor outlet and the compressor inlet, respectively the air enthalpy at the compressor outlet and the compressor inlet, η cc is the efficiency of the combustor, and LHV is the lower heating value. The gas turbine model is as follows: In the formula, k is a constant, A is the turbine inlet area, m is the flue gas flow at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant value; The model of the supplementary combustion type waste heat boiler in the above-mentioned gas turbine combined cycle heat and power cogeneration system is as follows: m g c p (T g1 -T g2 )=m s (h s2 -h s1 )=(UA) p ΔT; where m g is the flue gas flow, m s is the steam flow, c p is the specific heat capacity, ΔT is the logarithmic temperature difference, (UA) p is the overall heat surface heat transfer coefficient, T g1 is the inlet flue gas temperature of the supplementary fired waste heat boiler, T g2 is the outlet flue gas temperature of the supplementary fired waste heat boiler, h s1 is the inlet enthalpy of the steam / water, h s2 is the outlet enthalpy of the steam / water, T s1 is the inlet temperature of the steam / water, T s2 is the outlet temperature of the steam / water.

2. The method of claim 1, wherein, According to the user side thermal and electrical load demand, an optimal operation scheme containing the variable working condition adjustment mode and the supplementary combustion temperature is obtained in the thermal and electrical operation domain, which comprises the following steps: All operation schemes meeting the user side thermal and electrical load demand are found out from the thermal and electrical operation domain; wherein, the operation scheme is the operation scheme of the gas turbine combined cycle heat and power cogeneration system; All operation schemes are traversed, if the electrical load corresponding to the operation scheme is closest to the electrical load demand and the thermal load corresponding to the operation scheme is closest to the thermal load demand, the operation scheme is taken as the optimal operation scheme.

3. Control device for a gas turbine combined cycle cogeneration system, characterized in that, The method comprises the following steps: A flue gas flow module is configured to obtain the flue gas flow variation of the gas turbine under different variable working condition adjustment modes and different electrical loads according to the full working condition model of the gas turbine combined cycle heat and power cogeneration system; A steam production module is configured to obtain the steam production variation of the supplementary combustion type waste heat boiler under different supplementary combustion temperatures according to the model of the supplementary combustion type waste heat boiler in the gas turbine combined cycle heat and power cogeneration system and the flue gas flow variation; A load module is configured to obtain the variable working condition thermal and electrical load variation of the gas turbine combined cycle heat and power cogeneration system under different variable working condition adjustment modes and different supplementary combustion temperatures according to the flue gas flow variation and the steam production variation; A thermal and electrical operation domain module is configured to obtain the thermal and electrical operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable working condition adjustment modes and different supplementary combustion temperatures according to the variable working condition thermal and electrical load variation; An optimal control module is configured to obtain an optimal operation scheme containing the variable working condition adjustment mode and the supplementary combustion temperature in the thermal and electrical operation domain according to the user side thermal and electrical load demand, and to control the gas turbine combined cycle heat and power cogeneration system according to the optimal operation scheme. In the flue gas flow module, the full working condition model of the gas turbine combined cycle heat and power cogeneration system comprises a combustion chamber model and a gas turbine model; The combustion chamber model is: where β is the excess air ratio, L is the theoretical air quantity, respectively the flue gas enthalpy at the combustor outlet and the compressor inlet, respectively the fuel enthalpy at the compressor outlet and the compressor inlet, respectively the air enthalpy at the compressor outlet and the compressor inlet, η cc is the efficiency of the combustor, and LHV is the lower heating value. The gas turbine model is: In the formula, k is a constant, A is the turbine inlet area, m is the flue gas flow at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant value; In the steam production module, the model of the supplementary combustion type waste heat boiler in the gas turbine combined cycle heat and power cogeneration system is: m g c p (T g1 -T g2 )=m s (h s2 -h s1 )=(UA) p ΔT; where m g is the flue gas flow, m s is the steam flow, c p is the specific heat capacity, ΔT is the logarithmic temperature difference, (UA) p is the overall heat surface heat transfer coefficient, T g1 is the inlet flue gas temperature of the supplementary fired waste heat boiler, T g2 is the outlet flue gas temperature of the supplementary fired waste heat boiler, h s1 is the inlet enthalpy of the steam / water, h s2 is the outlet enthalpy of the steam / water, T s1 is the inlet temperature of the steam / water, T s2 is the outlet temperature of the steam / water.

4. The apparatus of claim 3, wherein, In the optimization control module, an optimal operation scheme comprising a variable working condition adjustment mode and a supplementary combustion temperature is obtained in a heat and power operation domain according to user-side heat and power load demands, comprising: All operation schemes satisfying the user-side heat and power load demands are found out from the heat and power operation domain; wherein the operation scheme is an operation scheme of the gas turbine combined cycle heat and power cogeneration system; All operation schemes are traversed, and if the electric load corresponding to the operation scheme is closest to the electric load demand and the heat load corresponding to the operation scheme is closest to the heat load demand, the operation scheme is taken as the optimal operation scheme.

5. A computer readable storage medium, characterized in that, The computer readable storage medium stores one or more programs, and the one or more programs comprise instructions which, when executed by a computing device, cause the computing device to perform the method of any one of claims 1-2.

6. A computer device, comprising: Comprise: One or more processors and one or more memories, one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs comprise instructions for executing the method of any one of claims 1-2.

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