Coupling fused salt energy storage combined heat and power generation unit operation control method and device

Abstract

The invention provides a coupled fused salt energy storage combined heat and power generation unit operation control method and device, and relates to the field of unit control, and the method comprises the steps: inputting the obtained unit main steam flow and moment heat supply parameters into a pre-constructed prediction generation power model, and obtaining the moment prediction generation power upper and lower limit values; wherein the predicted power generation power model is obtained by training a linear model by using the historical power generation power of the unit and the corresponding heat supply parameters; determining a unit operation mode according to the moment actual generation power and the moment predicted generation power upper and lower limit values; and if it is determined that the unit operation mode is the deep peak regulation mode, the target steam supply average flow from the fused salt steam generator to the low-pressure steam supply header is determined according to the fused salt heat storage amount, and deep peak regulation is conducted on the unit according to the target steam supply average flow. The problem that when the fused salt heat storage system stores and releases heat can be solved, operation adjustment of the steam turbine unit and the fused salt heat storage system is helped, and the operation stability of the steam turbine unit is improved.

Description

Technical Field

[0001] This application relates to the field of unit control, specifically a method and device for operating control of a coupled molten salt energy storage cogeneration unit. Background Technology

[0002] Because combined heat and power (CHP) units are designed to meet the needs of industrial users, their load adjustment range is narrower than that of pure condensing units, making it impossible to achieve peak-shaving and valley-shaving operation. However, by adding an energy storage system, the unit's peak-shaving capacity can be significantly improved. Therefore, combined thermal power and energy storage peak-shaving units have received widespread attention in recent years.

[0003] Currently, the common configuration for energy storage systems in power plants is a dual-tank system using molten salt as the medium. This dual-tank system involves two phases: storage and release. Operational adjustments raise questions about when to store and release heat, and further complicate the overall operation and adjustment of the turbine unit after coupling with the generator set. Therefore, a new operational control method for coupled molten salt energy storage cogeneration units is needed.

[0004] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section. Summary of the Invention

[0005] To address the problems in the prior art, this application provides a method and apparatus for operating control of a coupled molten salt energy storage cogeneration unit, which can solve the problem of when the molten salt thermal storage system stores and releases heat, help the turbine unit and the molten salt thermal storage system to make operational adjustments, and improve the operational stability of the turbine unit.

[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0007] In a first aspect, this application provides an operation control method for a coupled molten salt energy storage cogeneration unit, including:

[0008] The obtained main steam flow rate of the unit and the heating parameters at any time are input into a pre-constructed predictive power generation model to obtain the upper and lower limits of the predicted power generation at any time; wherein, the predictive power generation model is obtained by training a linear model using the historical power generation of the unit and the corresponding heating parameters.

[0009] The unit operation mode is determined based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0010] If the unit's operating mode is determined to be the deep peak shaving mode, the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header is determined based on the molten salt heat storage capacity, and the unit is subjected to deep peak shaving based on the target average steam supply flow rate.

[0011] Furthermore, the step of constructing the predicted power generation model includes:

[0012] A training set was constructed using the historical power generation of the unit and the corresponding heating parameters.

[0013] The parameters of the linear model are fitted using the training set until the error function corresponding to the linear model converges, thus obtaining the predicted power generation model.

[0014] Further, the time-based heating parameters include the low-pressure steam header pressure, low-pressure steam header temperature, low-pressure steam header steam flow rate, medium-pressure steam header pressure, medium-pressure steam header temperature, and medium-pressure steam header steam flow rate; the unit main steam flow rate includes the unit's maximum main steam flow rate and the unit's minimum main steam flow rate; the step of inputting the acquired unit main steam flow rate and time-based heating parameters into a pre-constructed predicted power generation model to obtain the upper and lower limits of the time-based predicted power generation includes:

[0015] Input the maximum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the upper limit of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time.

[0016] The minimum main steam flow rate of the unit and the heating parameters at the specified time are input into the predicted power generation model to obtain the lower limit of the predicted power generation at the specified time.

[0017] Furthermore, determining the unit operating mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time includes:

[0018] When the actual power generation at the specified time is between the lower limit of the predicted power generation at the specified time and the upper limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the heating mode.

[0019] When the actual power generation at the specified time is greater than the upper limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the peak mode;

[0020] When the actual power generation at the specified time is less than the lower limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the deep peak shaving mode.

[0021] Further, determining the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam header based on the molten salt heat storage includes:

[0022] The molten salt heat storage capacity under the daily heating mode is determined based on the obtained heating mode running time and the time heating parameters under the heating mode.

[0023] The molten salt heat release during the daily peak mode is determined based on the obtained peak mode runtime and the time-based heating parameters during the peak mode.

[0024] The heat storage and heat release of molten salt under the deep peak shaving mode are determined based on the obtained deep peak shaving mode running time and the time-based heating parameters under the deep peak shaving mode.

[0025] The molten salt heat storage deviation is obtained based on the molten salt heat storage under the daily heating mode, the molten salt heat release under the daily peak mode, and the molten salt heat storage and molten salt heat release under the deep peak shaving mode.

[0026] The target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode is determined based on the steam enthalpy value from the molten salt steam generator to the low-pressure steam supply header, the feedwater enthalpy value at the inlet of the molten salt steam generator, and the molten salt thermal storage deviation.

[0027] Furthermore, the step of performing deep peak shaving on the unit based on the target average steam supply flow includes:

[0028] Close the extraction valve from the hot reheat to the medium-pressure steam supply header, close the extraction valve from the fourth extraction to the low-pressure steam supply header, open the extraction valve from the hot reheat to the low-pressure steam supply header, open the extraction valve from the molten salt steam generator to the medium-pressure steam supply header, and open the extraction valve from the molten salt steam generator to the low-pressure steam supply header.

[0029] The flow rate of the extraction valve from the molten salt steam generator to the low-pressure steam supply header is controlled based on the target average steam supply flow rate.

[0030] Furthermore, the aforementioned method for operating and controlling coupled molten salt energy storage cogeneration units also includes:

[0031] If the unit's operating mode is determined to be the heating mode, open the extraction valve of the heat reheat to the medium-pressure steam supply header, close the extraction valve of the heat reheat to the low-pressure steam supply header, close the extraction valve of the molten salt steam generator to the medium-pressure steam supply header, close the extraction valve of the molten salt steam generator to the low-pressure steam supply header, and control the heat reheat extraction steam to pass through the heat reheat heat exchanger for heat storage, so that the heat-stored steam can re-enter the medium-pressure steam supply header to meet the medium-pressure heating demand;

[0032] Open the extraction valve of the four-stage extraction steam to the low-pressure steam supply header, and control the four-stage extraction steam to pass through the four extraction heat exchanger for heat storage, so that the heat-stored steam can enter the low-pressure steam supply header to meet the low-pressure heating demand.

[0033] Furthermore, the aforementioned method for operating and controlling coupled molten salt energy storage cogeneration units also includes:

[0034] If the unit's operating mode is determined to be the peak mode, close the extraction valve from the heat reheat to the medium-pressure steam supply header, close the extraction valve from the fourth extraction to the low-pressure steam supply header, close the extraction valve from the heat reheat to the low-pressure steam supply header, open the extraction valve from the molten salt steam generator to the medium-pressure steam supply header, open the extraction valve from the molten salt steam generator to the low-pressure steam supply header, and control the steam generated by the molten salt steam generator to enter the medium-pressure steam supply header and the low-pressure steam supply header respectively.

[0035] Secondly, this application provides an operation control device for a coupled molten salt energy storage cogeneration unit, comprising:

[0036] The power prediction model construction unit is used to input the acquired main steam flow rate of the unit and the heating parameters at any time into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at any time; wherein, the predicted power generation model is obtained by training a linear model using the historical power generation of the unit and the corresponding heating parameters.

[0037] The operation mode determination unit is used to determine the unit operation mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0038] The deep peak shaving unit is used to determine the target average steam supply flow from the molten salt steam generator to the low-pressure steam supply header based on the molten salt heat storage capacity, and to perform deep peak shaving on the unit based on the target average steam supply flow if the unit operation mode is determined to be the deep peak shaving mode.

[0039] Furthermore, the power prediction model construction unit includes:

[0040] The training set construction module is used to construct a training set using the historical power generation of the unit and the corresponding heating parameters.

[0041] The model training module is used to fit the parameters of the linear model using the training set until the error function corresponding to the linear model converges, thereby obtaining the predicted power generation model.

[0042] Further, the heating parameters at any given time include the low-pressure steam header pressure, low-pressure steam header temperature, low-pressure steam header steam flow rate, medium-pressure steam header pressure, medium-pressure steam header temperature, and medium-pressure steam header steam flow rate; the unit main steam flow rate includes the unit's maximum main steam flow rate and the unit's minimum main steam flow rate; the power prediction model construction unit includes:

[0043] The power upper limit determination module is used to input the maximum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the upper limit value of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time.

[0044] The power lower limit determination module is used to input the minimum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the lower limit value of the predicted power generation at the time in the upper and lower limit values ​​of the predicted power generation at the time.

[0045] Furthermore, the operating mode determination unit includes:

[0046] The heating mode determination module is used to determine the unit operation mode as the heating mode when the actual power generation at the time is between the lower limit of the predicted power generation at the time and the upper limit of the predicted power generation at the time.

[0047] The peak mode determination module is used to determine the unit operation mode at the time as the peak mode when the actual power generation at the time is greater than the upper limit of the predicted power generation at the time.

[0048] The peak-shaving mode determination module is used to determine the unit operation mode as the deep peak-shaving mode when the actual power generation at the time is less than the lower limit of the predicted power generation at the time.

[0049] Furthermore, the deep peak-shaving unit includes:

[0050] The heating and heat storage determination module is used to determine the molten salt heat storage capacity under the daily heating mode based on the obtained heating mode running time and the time heating parameters under the heating mode.

[0051] The peak heat release determination module is used to determine the molten salt heat release in the daily peak mode based on the acquired peak mode running time and the time-based heating parameters in the peak mode.

[0052] The peak shaving and storage determination module is used to determine the molten salt heat storage and molten salt heat release under the deep peak shaving mode based on the obtained deep peak shaving mode running time and the time heating parameters under the deep peak shaving mode.

[0053] The heat storage deviation determination module is used to obtain the molten salt heat storage deviation based on the molten salt heat storage in the daily heating mode, the molten salt heat release in the daily peak mode, the molten salt heat storage and molten salt heat release in the deep peak shaving mode.

[0054] The average flow rate determination module is used to determine the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode based on the steam enthalpy value from the molten salt steam generator to the low-pressure steam supply header, the feedwater enthalpy value at the inlet of the molten salt steam generator, and the molten salt thermal storage deviation.

[0055] Furthermore, the deep peak-shaving unit includes:

[0056] The steam valve opening and closing module is used to close the extraction steam valve from the hot reheat to the medium-pressure steam supply header, close the extraction steam valve from the fourth extraction to the low-pressure steam supply header, open the extraction steam valve from the hot reheat to the low-pressure steam supply header, open the extraction steam valve from the molten salt steam generator to the medium-pressure steam supply header, and open the extraction steam valve from the molten salt steam generator to the low-pressure steam supply header.

[0057] The flow control module is used to control the flow of the extraction valve from the molten salt steam generator to the low-pressure steam supply header based on the target average steam supply flow rate.

[0058] Furthermore, the coupled molten salt energy storage cogeneration unit operation control device also includes:

[0059] The medium-pressure heating unit is used to, if the unit's operating mode is determined to be the heating mode, open the extraction valve of the heat reheat to the medium-pressure steam supply header, close the extraction valve of the heat reheat to the low-pressure steam supply header, close the extraction valve of the molten salt steam generator to the medium-pressure steam supply header, close the extraction valve of the molten salt steam generator to the low-pressure steam supply header, and control the heat reheat extraction steam to pass through the heat reheat heat exchanger for heat storage, so that the heat-stored steam can re-enter the medium-pressure steam supply header to meet the medium-pressure heating demand;

[0060] The low-pressure heating unit is used to open the extraction valve of the four-stage extraction steam to the low-pressure steam supply header, and control the four-stage extraction steam to store heat through the four extraction heat exchangers so that the stored steam can re-enter the low-pressure steam supply header to meet the low-pressure heating demand.

[0061] Furthermore, the coupled molten salt energy storage cogeneration unit operation control device also includes:

[0062] The peak control unit is used to, if the unit's operating mode is determined to be the peak mode, close the extraction valve from the heat reheat to the medium-pressure steam supply header, close the extraction valve from the fourth extraction to the low-pressure steam supply header, close the extraction valve from the heat reheat to the low-pressure steam supply header, open the extraction valve from the molten salt steam generator to the medium-pressure steam supply header, open the extraction valve from the molten salt steam generator to the low-pressure steam supply header, and control the steam generated by the molten salt steam generator to enter the medium-pressure steam supply header and the low-pressure steam supply header respectively.

[0063] Thirdly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the coupled molten salt energy storage cogeneration unit operation control method.

[0064] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the coupled molten salt energy storage cogeneration unit operation control method.

[0065] Fifthly, this application provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of the coupled molten salt energy storage cogeneration unit operation control method.

[0066] To address the problems in existing technologies, the coupled molten salt energy storage cogeneration unit operation control method and device provided in this application can determine the upper and lower limits of the predicted power generation at any given time based on the unit's main steam flow rate, the heating parameters at any given time, and the predicted power generation model; determine whether the unit is in heating mode, peak mode, or deep peak shaving mode based on the actual power generation at any given time and the upper and lower limits of the predicted power generation; if the unit's operating mode is determined to be deep peak shaving mode, determine the target average steam flow rate from the molten salt steam generator to the low-pressure steam header based on the molten salt heat storage capacity, and perform deep peak shaving on the unit based on the target average steam flow rate; thereby solving the problem of when the molten salt thermal storage system stores and releases heat, helping the turbine unit and the molten salt thermal storage system to adjust their operation, and improving the operating stability of the turbine unit. Attached Figure Description

[0067] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0068] Figure 1 This is one of the flowcharts for the operation control method of the coupled molten salt energy storage cogeneration unit in the embodiments of this application;

[0069] Figure 2 This is a flowchart illustrating the construction of a predicted power generation model in an embodiment of this application;

[0070] Figure 3 This is a flowchart illustrating the process of obtaining the upper and lower limits of the predicted power generation at specific times in an embodiment of this application.

[0071] Figure 4 This is a flowchart illustrating the process of determining the unit's operating mode in this application embodiment;

[0072] Figure 5 This is a flowchart illustrating the determination of the target average steam supply flow rate in the embodiments of this application;

[0073] Figure 6 This is a flowchart illustrating the deep peak tuning process in this application embodiment;

[0074] Figure 7 This is the second flowchart of the operation control method for coupled molten salt energy storage cogeneration units in the embodiments of this application;

[0075] Figure 8 This is one of the structural diagrams of the coupled molten salt energy storage cogeneration unit operation control device in the embodiments of this application;

[0076] Figure 9 This is one of the structural diagrams of the power prediction model construction unit in the embodiments of this application;

[0077] Figure 10 This is the second structural diagram of the power prediction model construction unit in the embodiments of this application;

[0078] Figure 11 This is a structural diagram of the operation mode determination unit in the embodiments of this application;

[0079] Figure 12 This is one of the structural diagrams of the deep peak-shaving unit in the embodiments of this application;

[0080] Figure 13 This is the second structural diagram of the deep peak-shaving unit in the embodiments of this application;

[0081] Figure 14 This is the second structural diagram of the coupled molten salt energy storage cogeneration unit operation control device in the embodiments of this application;

[0082] Figure 15 This is a system diagram of a coupled molten salt energy storage cogeneration unit in an embodiment of this application;

[0083] Figure 16 This is a schematic diagram of the power generation prediction model method in the embodiments of this application;

[0084] Figure 17 This is one of the schematic diagrams of the operation mode determination method in the embodiments of this application;

[0085] Figure 18 This is the second schematic diagram of the operation mode determination method in the embodiments of this application;

[0086] Figure 19 This is a schematic diagram illustrating the calculation method of the target average steam supply flow rate M1 from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode in this application embodiment;

[0087] Figure 20 This is a schematic diagram of the structure of the electronic device in the embodiments of this application. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0089] The information collected in the technical solution of this application is information and data authorized by the user or fully authorized by all parties. The collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data all comply with the relevant laws, regulations and standards of the relevant countries and regions, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation portals are provided for users to choose to authorize or refuse.

[0090] Provide users with corresponding operation entry points, allowing them to choose to agree to or reject the automated decision results; if the user chooses to reject, the process will proceed to the expert decision-making process.

[0091] In one embodiment, see Figure 1 To address the issue of when to store and release heat in molten salt thermal energy storage systems, and to assist in the operational adjustments of turbine units and molten salt thermal energy storage systems, thereby improving the operational stability of turbine units, this application provides an operational control method for coupled molten salt energy storage cogeneration units, comprising:

[0092] S101: Input the acquired main steam flow rate and heating parameters of the unit into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at the time; wherein, the predicted power generation model is obtained by training a linear model using the unit's historical power generation and corresponding heating parameters.

[0093] S102: Determine the unit operation mode based on the actual power generation at the time and the upper and lower limits of the predicted power generation at the time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0094] S103: If the unit operation mode is determined to be the deep peak shaving mode, the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header is determined based on the obtained molten salt heat storage, and the unit is subjected to deep peak shaving based on the target average steam supply flow rate.

[0095] Understandably, this application provides a method for operating control of coupled molten salt energy storage cogeneration units, realizing intelligent decision-making for the operating mode of thermal power units and coordinated peak shaving of molten salt thermal storage. It collects main steam flow parameters and heating system parameters in real time, establishes a variable operating condition calculation model, and dynamically calculates the theoretical power generation range of the unit under the current operating condition, forming upper and lower limits for predicted power generation. The actual power generation of the unit is compared with the predicted power range. When the actual power exceeds the upper limit, it is determined to be in peak mode; when it is in the middle range, it enters heating mode; and when it is below the lower limit, it triggers deep peak shaving mode. This judgment process comprehensively considers the real-time changes in grid dispatch instructions and heat load demand.

[0096] In the deep peak-shaving mode, based on real-time thermal storage capacity data of the molten salt storage tank, thermodynamic calculations are used to determine the target steam flow rate that the molten salt steam generator should provide to the low-pressure steam header. This flow rate must simultaneously meet the requirements of maintaining the unit's minimum output, ensuring stable heating parameters, and fully utilizing the energy storage potential of the molten salt. By establishing a linkage control strategy between the molten salt thermal storage system and the steam turbine, excess thermal energy can be stored during periods of low grid load, released during peak-shaving demand periods, and heating steam parameters can be dynamically adjusted. This coordinated control significantly improves the stability of the unit's operation under varying conditions. Practice shows that this method allows the unit to continuously provide heating for several hours under rated load, effectively supporting the "thermal power + molten salt" hybrid system.

[0097] As described above, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can determine the upper and lower limits of the predicted power generation at any given time based on the unit's main steam flow rate, the heating parameters at any given time, and the predicted power generation model; determine whether the unit belongs to the heating mode, peak mode, or deep peak shaving mode based on the actual power generation at any given time and the upper and lower limits of the predicted power generation at any given time; if the unit operation mode is determined to be deep peak shaving mode, determine the target average steam flow rate from the molten salt steam generator to the low-pressure steam header based on the molten salt heat storage capacity, and perform deep peak shaving on the unit based on the target average steam flow rate; thereby solving the problem of when the molten salt thermal storage system stores and releases heat, helping the turbine unit and the molten salt thermal storage system to make operational adjustments, and improving the operational stability of the turbine unit.

[0098] In one embodiment, see Figure 2 The steps for constructing the predicted power generation model include:

[0099] S201: Construct a training set using the historical power generation of the unit and the corresponding heating parameters;

[0100] S202: Fit the parameters of the linear model using the training set until the error function corresponding to the linear model converges, and obtain the predicted power generation model.

[0101] Understandably, see Figure 16 Based on historical power generation data and corresponding heating parameter data, the specific steps for obtaining the predicted power generation model are as follows.

[0102] First, historical power generation data of the generating unit (also known as historical power generation of the unit) and corresponding heating parameter data are collected. Specifically, the heating parameter data may include the pressure, temperature, and steam flow rate of the medium-pressure steam header, as well as the pressure, temperature, and steam flow rate of the low-pressure steam header and the main steam flow rate. This is represented by a vector indicating the correspondence between a set of operating condition data and power generation, for example, x1 = (2.5, 300, 50, 1.2, 300, 250, 1000), y1 = 280. The physical quantities included in the operating condition data can be adjusted according to the actual system settings.

[0103] Second, the operating condition data is normalized and divided into training and validation sets. Specifically, since the numerical ranges of different physical quantities in the operating condition data vary greatly, it is necessary to normalize the operating condition data. For example, the min-max normalization method can be used to achieve normalization, which can be expressed by the following formula (1):

[0104]

[0105] Where x is the data to be normalized, x min x is the minimum value of this type of data. max x represents the maximum value of this type of data. norm This is the normalized data.

[0106] In addition, logarithmic normalization or L2 norm normalization can also be used. This application does not restrict the specific method of normalization. After normalization, the historical operating data (including heating parameter data) and the corresponding historical power generation data are combined and divided into training and validation sets.

[0107] Third, the pre-defined power generation prediction model is trained using a training set and a validation set. Specifically, the power generation prediction model is a linear model. The mean square error is used as the error function. The power generation prediction model can be expressed by formula (2), and the mean square error function can be expressed by formula (3):

[0108] y(x)=θ0+θ1x1+…+θ n x n (2)

[0109]

[0110] Where J(θ) represents the value of the mean square error function, θ represents the coefficient set of the predicted power generation model, and θ i Let x represent the i-th coefficient in the coefficient set, where 0 ≤ i ≤ n, n represents the sample size, and x ∈ [0, 1]. iLet y(x) represent a vector of working condition data from a set of samples. i The ) indicates that the power generation prediction model uses the operating condition data vector x. i The calculated predicted power generation value, y i This represents the historical power generation value of this sample group.

[0111] The partial derivative of the mean square error is used to update the parameters using the gradient descent method. The partial derivative function can be expressed by formula (4), and the update function can be expressed by formula (5).

[0112]

[0113] Where η represents the learning rate, It is the value of the j-th parameter in the (i+1)-th iteration. This is the value of the j-th parameter in the i-th iteration. When J(θ) is less than a preset value, training stops, and the final predicted power generation model is obtained. The preset value can be, for example, 10. -6 This value can be set according to actual needs, and this application does not impose any restrictions on it.

[0114] As can be seen from the above description, the operation control method for coupled molten salt energy storage cogeneration units provided in this application can construct a predictive power generation model.

[0115] In one embodiment, see Figure 3 The time-based heating parameters include the low-pressure steam header pressure, low-pressure steam header temperature, low-pressure steam header steam flow rate, medium-pressure steam header pressure, medium-pressure steam header temperature, and medium-pressure steam header steam flow rate; the unit main steam flow rate includes the unit's maximum main steam flow rate and the unit's minimum main steam flow rate; the process of inputting the acquired unit main steam flow rate and time-based heating parameters into a pre-constructed predicted power generation model to obtain the upper and lower limits of the time-based predicted power generation includes:

[0116] S301: Input the maximum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the upper limit of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time.

[0117] S302: Input the minimum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the lower limit of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time.

[0118] Understandably, the heating parameters for each moment of the day are obtained based on the daily heating load data provided by the heating users, and the upper and lower limits of the predicted power generation at the same moment are obtained through the power generation prediction model based on the heating parameters at each moment.

[0119] Specifically, based on the heating parameters at each moment, the upper limit and lower limit of power generation at the same moment are obtained through a power generation prediction model. The specific steps are as follows:

[0120] By substituting the unit's maximum main steam flow rate and heating parameters at each moment into the predicted power generation model, the upper limit of the predicted power generation at that moment is obtained, i.e., P. 上限 ;

[0121] By substituting the unit's minimum main steam flow rate and the heating parameters at each moment into the predicted power generation model, the lower limit of the predicted power generation at that moment is obtained, i.e., P. 下限 ;

[0122] The heating parameters include: low-pressure steam supply header pressure, low-pressure steam supply header temperature, low-pressure steam supply header steam flow rate, medium-pressure steam supply header pressure, medium-pressure steam supply header temperature, and medium-pressure steam supply header steam flow rate.

[0123] As can be seen from the above description, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can input the obtained unit main steam flow and time-based heating parameters into a pre-constructed predicted power generation model to obtain the upper and lower limits of the time-based predicted power generation.

[0124] In one embodiment, see Figure 4 The step of determining the unit operating mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time includes:

[0125] S401: When the actual power generation at the specified time is between the lower limit of the predicted power generation at the specified time and the upper limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the heating mode;

[0126] S402: When the actual power generation at the specified time is greater than the upper limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the peak mode;

[0127] S403: When the actual power generation at the specified time is less than the lower limit of the predicted power generation at the specified time, the unit operation mode at that time is determined to be the deep peak shaving mode.

[0128] It is understandable that the power generation at each moment of the day can be obtained from the daily power generation curve provided by the power grid dispatch; and by comparing the power generation at each moment with the upper limit and lower limit of the predicted power generation at the same moment, the operating mode of the unit can be obtained, as follows.

[0129] When the lower limit of the predicted power generation at a given moment obtained through the predicted power generation model is less than the power generation at that moment, and the upper limit of the predicted power generation at that moment obtained through the predicted power generation model, it is determined that the unit's operating mode at that moment is the heating mode, and the daily operating time of the heating mode and the heating data at each moment under the heating mode are statistically obtained.

[0130] When the upper limit of the predicted power generation at a given moment is less than the power generation at that moment, the unit is determined to be in peak mode, and the daily peak mode running time and the heating data at each moment in peak mode are statistically calculated.

[0131] When the power generation at that moment is less than the lower limit of the predicted power generation obtained by the predicted power generation model, the unit is determined to be in deep peak shaving mode, and the daily deep peak shaving mode running time and the heating data at each moment in deep peak shaving mode are statistically obtained.

[0132] As can be seen from the above description, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can determine the unit operation mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time.

[0133] In one embodiment, see Figure 5 The step of determining the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam header based on the obtained molten salt heat storage includes:

[0134] S501: Determine the molten salt heat storage capacity under the daily heating mode based on the obtained heating mode running time and the time heating parameters under the heating mode.

[0135] S502: Determine the molten salt heat release in the daily peak mode based on the obtained peak mode running time and the time-based heating parameters in the peak mode;

[0136] S503: Determine the molten salt heat storage and molten salt heat release under the deep peak shaving mode based on the obtained deep peak shaving mode running time and the time-based heating parameters under the deep peak shaving mode.

[0137] S504: The molten salt heat storage deviation is obtained based on the molten salt heat storage in the daily heating mode, the molten salt heat release in the daily peak mode, the molten salt heat storage and molten salt heat release in the deep peak shaving mode.

[0138] S505: Determine the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode based on the steam enthalpy value from the molten salt steam generator to the low-pressure steam supply header, the feedwater enthalpy value at the inlet of the molten salt steam generator, and the molten salt heat storage deviation.

[0139] Understandably, see Figure 17, Figure 18 and Figure 19 The target average steam supply flow rate M1 from the molten salt steam generator to the low-pressure steam supply header under deep peak shaving mode is calculated as follows:

[0140] First, based on the statistically obtained operating time of the heating mode and the heating parameters under the heating mode, the molten salt heat storage A under the daily heating mode is obtained through the following formula.

[0141] A=∫Q cg dt=∫(M 1rz (h 1rz,in -h 1rz,out )+M 14c (h 14c,in -h 14c,out ))dt (6)

[0142] Among them, Q cg M represents the thermal storage capacity under heating mode. 1rz The hot reheat steam flow rate (h) in heating mode 1rz，in h represents the enthalpy of the inlet steam of the reheat heat exchanger. 1rz，out M represents the enthalpy of the steam at the outlet of the reheat heat exchanger. 14c For the four-stage steam extraction flow rate in heating mode, h 14c，in The enthalpy of the inlet steam of the four-extraction heat exchanger is h. 14c，out This is the enthalpy value of the steam at the outlet of the four-extraction heat exchanger.

[0143] Then, based on the peak mode running time and heating parameters obtained from statistics, the molten salt heat release B under the daily peak mode is obtained through the following formula.

[0144] B=∫Q fd dt=∫(M 2rz (h 2rz -h 2w )+M 24c (h 24c -h 2w ))dt (7)

[0145] Among them, Q fd M represents the heat storage power in the heat release mode. 2rz For the steam flow rate from the molten salt steam generator to the intermediate-pressure steam header in exothermic mode, h 2rz The enthalpy of steam supplied from the molten salt steam generator to the intermediate-pressure steam header, h 2w M represents the enthalpy of the feedwater at the inlet of the molten salt steam generator. 24c For the steam flow rate from the molten salt steam generator to the low-pressure steam header in exothermic mode, h 24c The enthalpy value of the steam supplied from the molten salt steam generator to the low-pressure steam header.

[0146] Furthermore, based on the statistically derived runtime of the deep peak shaving mode and the heating parameters under the deep peak shaving mode, the molten salt heat storage capacity C under the deep peak shaving mode is obtained through the following formula.

[0147] C=∫Q cs dt=∫(M 3rz (h 3rz,in -h 3rz,out )dt (8)

[0148] Among them, Q cs For the thermal storage power in deep peak shaving mode, M 3rz For deep peak shaving mode, the steam flow rate of hot re-extraction steam to the low-pressure steam header is h. 3rz，in h represents the enthalpy of the inlet steam of the reheat heat exchanger. 3rz，out The enthalpy of the steam at the outlet of the reheat heat exchanger.

[0149] Furthermore, based on the statistically derived runtime of the deep peak shaving mode and the heating parameters under the deep peak shaving mode, the molten salt heat release D under the deep peak shaving mode is obtained through the following formula.

[0150] D=∫Q fs dt=∫(M 4rz (h 4rz -h w,in ))dt (9)

[0151] Among them, Q fs For the heat release power in deep peak shaving mode, M 4rz For the steam flow rate from the molten salt steam generator to the medium-pressure steam header in deep peak shaving mode, h 4rz The enthalpy of steam supplied from the molten salt steam generator to the intermediate-pressure steam header, h w,in M represents the enthalpy of the feedwater at the inlet of the molten salt steam generator. 44c For the steam flow rate from the molten salt steam generator to the low-pressure steam header in deep peak shaving mode, h 44c The enthalpy value of the steam supplied from the molten salt steam generator to the low-pressure steam header.

[0152] Furthermore, the molten salt heat storage deviation E is obtained:

[0153] E = A - B + CD (10)

[0154] Furthermore, the initial value M1 of the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under deep peak shaving mode is obtained:

[0155]

[0156] Among them, h 44c The enthalpy of steam from the molten salt steam generator to the low-pressure steam header in deep peak shaving mode, h w,inThis refers to the enthalpy value of the feedwater at the inlet of the molten salt steam generator.

[0157] Furthermore, the molten salt heat storage C1 and the molten salt heat release D1 under deep peak shaving mode are obtained again using the following formulas:

[0158] C1=∫Q cs dt=∫((M 3rz -M 01 )×(h 3rz,in -h 3rz,out )dt (12)

[0159] D1=∫Q fs dt=∫(M 4rz (h 4rz -h w,in )+M0(h 44c -h w,in ))dt (13)

[0160] Furthermore, the molten salt thermal storage deviation E is obtained again:

[0161] E = A - B + C1 - D1 (14)

[0162] If E is not within the preset first error range, then assume another value for M1 and continue the iterative calculation of formulas 7, 8, and 9 until the value E is within the preset first error range. When the value E is within the preset first error range, stop the iterative calculation and take the last value of M1 as the target average steam supply flow rate M1 from the molten salt steam generator to the low-pressure steam supply header in the deep peak shaving mode.

[0163] As can be seen from the above description, the operation control method for coupled molten salt energy storage cogeneration units provided in this application can determine the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header based on the acquired molten salt heat storage.

[0164] In one embodiment, see Figure 6 , Figure 15 The step of performing deep peak shaving on the unit based on the target average steam supply flow includes:

[0165] S601: Close the extraction valve 1 from the hot reheat to the medium-pressure steam supply manifold, close the extraction valve 2 from the fourth extraction to the low-pressure steam supply manifold, open the extraction valve 3 from the hot reheat to the low-pressure steam supply manifold, open the extraction valve 4 from the molten salt steam generator to the medium-pressure steam supply manifold, and open the extraction valve 5 from the molten salt steam generator to the low-pressure steam supply manifold.

[0166] S602: Control the flow rate of the extraction valve 6 from the molten salt steam generator to the low-pressure steam supply manifold according to the target average steam supply flow rate.

[0167] Understandably, see Figure 19The deep peak shaving mode operates as follows: Close the extraction valve 1 from the hot reheat to the medium-pressure steam supply manifold, close the extraction valve 2 from the fourth extraction to the low-pressure steam supply manifold, open the extraction valve 3 from the hot reheat to the low-pressure steam supply manifold, open the extraction valve 4 from the molten salt steam generator to the medium-pressure steam supply manifold, and open the extraction valve 5 from the molten salt steam generator to the low-pressure steam supply manifold.

[0168] It should be noted that in the deep peak shaving mode, the extraction pressure of the fourth stage of the unit cannot meet the needs of the low-pressure steam supply users, so the fourth stage steam is no longer extracted for heating. At the same time, the reheat pressure cannot meet the needs of the medium-pressure steam supply users. Therefore, in the deep peak shaving mode, the reheat extraction steam is used for the low-pressure header steam supply; the steam generated by the molten salt steam generator is used to supply steam to the medium-pressure steam supply header and the low-pressure steam supply header.

[0169] Furthermore, in the deep peak shaving mode, to achieve a balance between the total heat storage and total heat release of the molten salt system daily, it is necessary to control the flow rate of the extraction valve 6 from the molten salt steam generator to the low-pressure steam supply header. Specifically, by providing the target average steam supply flow rate M1 from the molten salt steam generator to the low-pressure steam supply header in the deep peak shaving mode, the automatic flow control of the regulating valve 6 from the molten salt steam generator to the low-pressure steam supply header is activated, thereby controlling the flow rate and ensuring a balance between the total heat storage and total heat release of the molten salt system daily.

[0170] As can be seen from the above description, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can perform deep peak shaving of the unit according to the target average steam supply flow.

[0171] In one embodiment, see Figure 7 , Figure 15 The operation control method for coupled molten salt energy storage cogeneration units also includes:

[0172] S701: If the unit's operating mode is determined to be the heating mode, open the hot reheat to medium-pressure steam supply header extraction valve 1, close the hot reheat to low-pressure steam supply header extraction valve 3, close the molten salt steam generator to medium-pressure steam supply header extraction valve 4, close the molten salt steam generator to low-pressure steam supply header extraction valve 5, and control the hot reheat extraction steam to pass through the hot reheat heat exchanger for heat storage, so that the heat-stored steam can re-enter the medium-pressure steam supply header to meet the medium-pressure heating demand;

[0173] S702: Open the extraction valve 2 of the four-stage extraction steam to the low-pressure steam supply header, and control the four-stage extraction steam to pass through the four extraction heat exchanger for heat storage, so that the heat-stored steam can re-enter the low-pressure steam supply header to meet the low-pressure heating demand.

[0174] Understandably, the process of controlling the unit in heating mode is as follows.

[0175] Open the extraction valve 1 from the hot reheat to the medium-pressure steam supply header, close the extraction valve 3 from the hot reheat to the low-pressure steam supply header, close the extraction valve 4 from the molten salt steam generator to the medium-pressure steam supply header, and close the extraction valve 5 from the molten salt steam generator to the low-pressure steam supply header. The hot reheat extracted steam is stored in the hot reheat heat exchanger, and the stored steam then enters the medium-pressure steam supply header to meet the medium-pressure heating demand.

[0176] Open the extraction valve 2 of the four-stage extraction steam to the low-pressure steam supply header. The four-stage extraction steam is stored in the heat exchanger and then enters the low-pressure steam supply header to meet the low-pressure heating demand.

[0177] As can be seen from the above description, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can control the unit in heating mode.

[0178] In one embodiment, see Figure 7 , Figure 15 The aforementioned method for operating and controlling coupled molten salt energy storage cogeneration units further includes:

[0179] If the unit's operating mode is determined to be the peak mode, close the extraction valve 1 from the hot reheat to the medium-pressure steam supply header, close the extraction valve 2 from the fourth extraction to the low-pressure steam supply header, close the extraction valve 3 from the hot reheat to the low-pressure steam supply header, open the extraction valve 4 from the molten salt steam generator to the medium-pressure steam supply header, and open the extraction valve 5 from the molten salt steam generator to the low-pressure steam supply header, controlling the steam generated by the molten salt steam generator to enter the medium-pressure steam supply header and the low-pressure steam supply header respectively.

[0180] Understandably, the following steps are taken: close the extraction valve 1 from the hot reheat to the medium-pressure steam supply header, close the extraction valve 2 from the fourth extraction to the low-pressure steam supply header, close the extraction valve 3 from the hot reheat to the low-pressure steam supply header, open the extraction valve 4 from the molten salt steam generator to the medium-pressure steam supply header, and open the extraction valve 5 from the molten salt steam generator to the low-pressure steam supply header. The steam generated by the molten salt steam generator then enters the medium-pressure steam supply header and the low-pressure steam supply header, respectively.

[0181] As can be seen from the above description, the coupled molten salt energy storage cogeneration unit operation control method provided in this application can control the unit in peak mode.

[0182] Based on the same inventive concept, this application also provides a coupled molten salt energy storage cogeneration unit operation control device, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of the coupled molten salt energy storage cogeneration unit operation control device in solving the problem is similar to that of the coupled molten salt energy storage cogeneration unit operation control method, the implementation of the coupled molten salt energy storage cogeneration unit operation control device can refer to the implementation of the software performance benchmark determination method, and will not be repeated. As used below, the term "unit" or "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0183] In one embodiment, see Figure 8 In order to solve the problem of when to store and release heat in molten salt thermal energy storage systems, and to help steam turbine units and molten salt thermal energy storage systems to make operational adjustments and improve the operational stability of steam turbine units, this application provides an operation control device for coupled molten salt energy storage cogeneration units, including: a power prediction model construction unit 801, an operation mode determination unit 802, and a deep peak shaving unit 803.

[0184] The power prediction model construction unit 801 is used to input the acquired main steam flow rate of the unit and the heating parameters at any time into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at any time; wherein, the predicted power generation model is obtained by training a linear model using the historical power generation of the unit and the corresponding heating parameters.

[0185] The operation mode determination unit 802 is used to determine the unit operation mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at the given time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0186] The deep peak shaving unit 803 is used to determine the target average steam supply flow from the molten salt steam generator to the low-pressure steam supply header based on the molten salt heat storage capacity, and to perform deep peak shaving on the unit based on the target average steam supply flow if the unit operation mode is determined to be the deep peak shaving mode.

[0187] In one embodiment, see Figure 9 The power prediction model construction unit 801 includes: a training set construction module 901 and a model training module 902.

[0188] Training set construction module 901 is used to construct a training set using the historical power generation of the unit and the corresponding heating parameters;

[0189] The model training module 902 is used to fit the parameters of the linear model using the training set until the error function corresponding to the linear model converges, thereby obtaining the predicted power generation model.

[0190] In one embodiment, see Figure 10 The heating parameters at any given time include the low-pressure steam supply header pressure, low-pressure steam supply header temperature, low-pressure steam supply header steam flow rate, medium-pressure steam supply header pressure, medium-pressure steam supply header temperature, and medium-pressure steam supply header steam flow rate; the main steam flow rate of the unit includes the maximum main steam flow rate and the minimum main steam flow rate of the unit; the power prediction model construction unit 801 includes: a power upper limit determination module 1001 and a power lower limit determination module 1002.

[0191] The power upper limit determination module 1001 is used to input the maximum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the upper limit value of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time.

[0192] The power lower limit determination module 1002 is used to input the minimum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the lower limit value of the predicted power generation at the time in the upper and lower limit values ​​of the predicted power generation at the time.

[0193] In one embodiment, see Figure 11 The operation mode determination unit 802 includes: a heating mode determination module 1101, a peak mode determination module 1102, and a peak shaving mode determination module 1103.

[0194] The heating mode determination module 1101 is used to determine the unit operation mode as the heating mode when the actual power generation at the time is between the lower limit of the predicted power generation at the time and the upper limit of the predicted power generation at the time.

[0195] The peak mode determination module 1102 is used to determine the unit operation mode at the time as the peak mode when the actual power generation at the time is greater than the upper limit of the predicted power generation at the time.

[0196] The peak shaving mode determination module 1103 is used to determine the unit operation mode at the time as the deep peak shaving mode when the actual power generation at the time is less than the lower limit of the predicted power generation at the time.

[0197] In one embodiment, see Figure 12 The depth peak-shaving unit 803 includes:

[0198] The heating and heat storage determination module 1201 is used to determine the molten salt heat storage capacity under the daily heating mode based on the obtained heating mode running time and the time heating parameters under the heating mode.

[0199] The peak heat release determination module 1202 is used to determine the molten salt heat release in the daily peak mode based on the acquired peak mode running time and the time heating parameters in the peak mode.

[0200] The peak shaving and storage determination module 1203 is used to determine the molten salt heat storage and molten salt heat release under the deep peak shaving mode based on the acquired deep peak shaving mode running time and the time heating parameters under the deep peak shaving mode.

[0201] The heat storage deviation determination module 1204 is used to obtain the molten salt heat storage deviation based on the molten salt heat storage in the daily heating mode, the molten salt heat release in the daily peak mode, the molten salt heat storage and molten salt heat release in the deep peak shaving mode.

[0202] The average flow rate determination module 1205 is used to determine the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode based on the steam enthalpy value from the molten salt steam generator to the low-pressure steam supply header, the feedwater enthalpy value at the inlet of the molten salt steam generator, and the molten salt heat storage deviation.

[0203] In one embodiment, see Figure 13 The deep peak shaving unit 803 includes: a steam valve opening and closing module 1301 and a flow control module 1302.

[0204] Steam valve opening and closing module 1301 is used to close the extraction steam valve from the hot reheat to the medium-pressure steam supply header, close the extraction steam valve from the fourth extraction to the low-pressure steam supply header, open the extraction steam valve from the hot reheat to the low-pressure steam supply header, open the extraction steam valve from the molten salt steam generator to the medium-pressure steam supply header, and open the extraction steam valve from the molten salt steam generator to the low-pressure steam supply header.

[0205] The flow control module 1302 is used to control the flow of the extraction valve from the molten salt steam generator to the low-pressure steam supply header according to the target average steam supply flow.

[0206] In one embodiment, see Figure 14 The coupled molten salt energy storage cogeneration unit operation control device further includes:

[0207] The medium-pressure heating unit 1401 is used to, if the unit's operating mode is determined to be the heating mode, open the extraction valve of the heat reheat to the medium-pressure steam supply header, close the extraction valve of the heat reheat to the low-pressure steam supply header, close the extraction valve of the molten salt steam generator to the medium-pressure steam supply header, close the extraction valve of the molten salt steam generator to the low-pressure steam supply header, and control the heat reheat extraction steam to be stored in the heat reheat heat exchanger so that the stored steam can re-enter the medium-pressure steam supply header to meet the medium-pressure heating demand;

[0208] The low-pressure heating unit 1402 is used to open the extraction valve of the four-stage extraction steam to the low-pressure steam supply header, and control the four-stage extraction steam to store heat through the four extraction heat exchanger so that the stored steam can re-enter the low-pressure steam supply header to meet the low-pressure heating demand.

[0209] In one embodiment, see Figure 14 The coupled molten salt energy storage cogeneration unit operation control device further includes:

[0210] The peak control unit 1403 is used to, if the unit's operating mode is determined to be the peak mode, close the extraction valve from the heat reheat to the medium-pressure steam supply header, close the extraction valve from the fourth extraction to the low-pressure steam supply header, close the extraction valve from the heat reheat to the low-pressure steam supply header, open the extraction valve from the molten salt steam generator to the medium-pressure steam supply header, open the extraction valve from the molten salt steam generator to the low-pressure steam supply header, and control the steam generated by the molten salt steam generator to enter the medium-pressure steam supply header and the low-pressure steam supply header respectively.

[0211] From a hardware perspective, in order to address the issue of when to store and release heat in molten salt thermal energy storage systems, and to assist in the operational adjustments of turbine units and molten salt thermal energy storage systems, thereby improving the operational stability of turbine units, this application provides an embodiment of an electronic device for implementing all or part of the operation control method for coupled molten salt energy storage cogeneration units. The electronic device specifically includes the following components:

[0212] The system comprises a processor, a memory, a communications interface, and a bus; wherein the processor, memory, and communications interface communicate with each other via the bus; the communications interface is used to realize information transmission between the coupled molten salt energy storage cogeneration unit operation control device and core business systems, user terminals, and related databases and other related equipment; the logic controller can be a desktop computer, tablet computer, or mobile terminal, etc., and this embodiment is not limited to these. In this embodiment, the logic controller can be implemented with reference to the embodiments of the coupled molten salt energy storage cogeneration unit operation control method and the coupled molten salt energy storage cogeneration unit operation control device, the contents of which are incorporated herein by reference, and repeated details will not be described again.

[0213] It is understood that the user terminal may include smartphones, tablet computers, network set-top boxes, portable computers, desktop computers, personal digital assistants (PDAs), in-vehicle devices, smart wearable devices, etc. Among these, the smart wearable devices may include smart glasses, smartwatches, smart bracelets, etc.

[0214] In practical applications, some aspects of the operation control method for coupled molten salt energy storage cogeneration units can be executed on the electronic equipment side as described above, or all operations can be completed in the client device. The choice can be made based on the processing power of the client device and the limitations of the user's usage scenario. This application does not impose any limitations on this. If all operations are completed in the client device, the client device may further include a processor.

[0215] The aforementioned client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission. The server may include a server on the task scheduling center side; in other implementation scenarios, it may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, a server cluster consisting of multiple servers, or a distributed server structure.

[0216] Figure 20 This is a schematic block diagram illustrating the system configuration of the electronic device 9600 according to an embodiment of this application. Figure 20 As shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It is worth noting that... Figure 20 This is an example; other types of structures can also be used to supplement or replace this structure to achieve telecommunications functions or other functions.

[0217] In one embodiment, the operation control method for coupled molten salt energy storage cogeneration units can be integrated into a central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0218] S101: Input the acquired main steam flow rate and heating parameters of the unit into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at the time; wherein, the predicted power generation model is obtained by training a linear model using the unit's historical power generation and corresponding heating parameters.

[0219] S102: Determine the unit operation mode based on the actual power generation at the time and the upper and lower limits of the predicted power generation at the time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0220] S103: If the unit operation mode is determined to be the deep peak shaving mode, the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header is determined based on the obtained molten salt heat storage, and the unit is subjected to deep peak shaving based on the target average steam supply flow rate.

[0221] Understandably, this application provides a method for operating control of coupled molten salt energy storage cogeneration units, realizing intelligent decision-making for the operating mode of thermal power units and coordinated peak shaving of molten salt thermal storage. It collects main steam flow parameters and heating system parameters in real time, establishes a variable operating condition calculation model, and dynamically calculates the theoretical power generation range of the unit under the current operating condition, forming upper and lower limits for predicted power generation. The actual power generation of the unit is compared with the predicted power range. When the actual power exceeds the upper limit, it is determined to be in peak mode; when it is in the middle range, it enters heating mode; and when it is below the lower limit, it triggers deep peak shaving mode. This judgment process comprehensively considers the real-time changes in grid dispatch instructions and heat load demand.

[0222] In another embodiment, the coupled molten salt energy storage cogeneration unit operation control device can be configured separately from the central processing unit 9100. For example, the data composite transmission device coupled to the molten salt energy storage cogeneration unit operation control device can be configured as a chip connected to the central processing unit 9100, and the function of the coupled molten salt energy storage cogeneration unit operation control method can be realized through the control of the central processing unit.

[0223] like Figure 20 As shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily need to include these components. Figure 20 All components shown; in addition, the electronic device 9600 may also include Figure 20 For components not shown, please refer to existing technologies.

[0224] like Figure 20 As shown, the central processing unit 9100, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device, which receives inputs and controls the operation of various components of the electronic device 9600.

[0225] The memory 9140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information, and also store a program for executing that information. The central processing unit 9100 may execute the program stored in the memory 9140 to perform information storage or processing, etc.

[0226] Input unit 9120 provides input to central processing unit 9100. Input unit 9120 may be, for example, a keypad or touch input device. Power supply 9170 provides power to electronic device 9600. Display 9160 displays images and text. Display may be, for example, an LCD display, but is not limited thereto.

[0227] The memory 9140 can be a solid-state memory, such as a read-only memory (ROM), random access memory (RAM), a SIM card, etc. It can also be a memory that retains information even when power is off, can be selectively erased, and contains more data; examples of this type of memory are sometimes referred to as EPROMs. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or processes for executing the operation of the electronic device 9600 via the central processing unit 9100.

[0228] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for the electronic device's communication functions and / or for performing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0229] The communication module 9110 is a transmitter / receiver that sends and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which is the same as in a conventional mobile communication terminal.

[0230] Based on different communication technologies, multiple communication modules 9110 can be configured in the same electronic device, such as cellular network modules, Bluetooth modules, and / or wireless LAN modules. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby realizing typical telecommunications functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. Additionally, the audio processor 9130 is also coupled to a central processing unit 9100, enabling on-device recording via the microphone 9132 and on-device playback of stored sound via the speaker 9131.

[0231] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the coupled molten salt energy storage cogeneration unit operation control method with a server or client as the execution subject in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the coupled molten salt energy storage cogeneration unit operation control method with a server or client as the execution subject in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0232] S101: Input the acquired main steam flow rate and heating parameters of the unit into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at the time; wherein, the predicted power generation model is obtained by training a linear model using the unit's historical power generation and corresponding heating parameters.

[0233] S102: Determine the unit operation mode based on the actual power generation at the time and the upper and lower limits of the predicted power generation at the time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode;

[0234] S103: If the unit operation mode is determined to be the deep peak shaving mode, the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header is determined based on the obtained molten salt heat storage, and the unit is subjected to deep peak shaving based on the target average steam supply flow rate.

[0235] Understandably, this application provides a method for operating control of coupled molten salt energy storage cogeneration units, realizing intelligent decision-making for the operating mode of thermal power units and coordinated peak shaving of molten salt thermal storage. It collects main steam flow parameters and heating system parameters in real time, establishes a variable operating condition calculation model, and dynamically calculates the theoretical power generation range of the unit under the current operating condition, forming upper and lower limits for predicted power generation. The actual power generation of the unit is compared with the predicted power range. When the actual power exceeds the upper limit, it is determined to be in peak mode; when it is in the middle range, it enters heating mode; and when it is below the lower limit, it triggers deep peak shaving mode. This judgment process comprehensively considers the real-time changes in grid dispatch instructions and heat load demand.

[0236] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0237] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0238] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0239] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0240] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for operating and controlling a coupled molten salt energy storage cogeneration unit, characterized in that, include: The obtained main steam flow rate of the unit and the heating parameters at any time are input into a pre-constructed predictive power generation model to obtain the upper and lower limits of the predicted power generation at any time; wherein, the predictive power generation model is obtained by training a linear model using the historical power generation of the unit and the corresponding heating parameters. The unit operation mode is determined based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode; If the unit's operating mode is determined to be the deep peak shaving mode, the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header is determined based on the molten salt heat storage capacity, and the unit is subjected to deep peak shaving based on the target average steam supply flow rate.

2. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, The steps for constructing the predicted power generation model include: A training set was constructed using the historical power generation of the unit and the corresponding heating parameters. The parameters of the linear model are fitted using the training set until the error function corresponding to the linear model converges, thus obtaining the predicted power generation model.

3. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, The main steam flow rate of the unit includes the maximum main steam flow rate and the minimum main steam flow rate of the unit; the step of inputting the acquired main steam flow rate of the unit and the heating parameters at any time into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at any time includes: Input the maximum main steam flow of the unit and the heating parameters at the time into the predicted power generation model to obtain the upper limit of the predicted power generation at the time in the upper and lower limits of the predicted power generation at the time. The minimum main steam flow rate of the unit and the heating parameters at the specified time are input into the predicted power generation model to obtain the lower limit of the predicted power generation at the specified time.

4. The operation control method for coupled molten salt energy storage cogeneration units according to claim 3, characterized in that, The process of determining the unit operating mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time includes: Determine whether the actual power generation at the given time is between the lower limit of the predicted power generation at the given time and the upper limit of the predicted power generation at the given time; if so, determine that the unit operation mode at that time is the heating mode. Determine whether the actual power generation at the specified time is greater than the upper limit of the predicted power generation at the specified time; if so, determine that the unit operation mode at that time is the peak mode. Determine whether the actual power generation at the specified time is less than the lower limit of the predicted power generation at the specified time; if so, determine that the unit operation mode at that time is the deep peak shaving mode.

5. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, The determination of the target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header based on the molten salt heat storage includes: The molten salt heat storage capacity under the daily heating mode is determined based on the obtained heating mode running time and the time heating parameters under the heating mode. The molten salt heat release during the daily peak mode is determined based on the obtained peak mode runtime and the time-based heating parameters during the peak mode. The heat storage and heat release of molten salt under the deep peak shaving mode are determined based on the obtained deep peak shaving mode running time and the time-based heating parameters under the deep peak shaving mode. The molten salt heat storage deviation is obtained based on the molten salt heat storage under the daily heating mode, the molten salt heat release under the daily peak mode, and the molten salt heat storage and molten salt heat release under the deep peak shaving mode. The target average steam supply flow rate from the molten salt steam generator to the low-pressure steam supply header under the deep peak shaving mode is determined based on the steam enthalpy value from the molten salt steam generator to the low-pressure steam supply header, the feedwater enthalpy value at the inlet of the molten salt steam generator, and the molten salt thermal storage deviation.

6. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, The deep peak shaving of the unit based on the target average steam supply flow includes: Close the hot reheat to medium-pressure steam supply manifold extraction valve (1), close the fourth extraction to low-pressure steam supply manifold extraction valve (2), open the hot reheat to low-pressure steam supply manifold extraction valve (3), open the molten salt steam generator to medium-pressure steam supply manifold extraction valve (4), and open the molten salt steam generator to low-pressure steam supply manifold extraction valve (5). The flow rate of the extraction valve (6) from the molten salt steam generator to the low-pressure steam supply manifold is controlled according to the target average steam supply flow rate.

7. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, Also includes: If the unit's operating mode is determined to be the heating mode, open the hot reheat to medium-pressure steam supply header extraction valve (1), close the hot reheat to low-pressure steam supply header extraction valve (3), close the molten salt steam generator to medium-pressure steam supply header extraction valve (4), close the molten salt steam generator to low-pressure steam supply header extraction valve (5), and control the hot reheat extraction steam to pass through the hot reheat heat exchanger for heat storage, so that the heat-stored steam can re-enter the medium-pressure steam supply header to meet the medium-pressure heating demand; Open the extraction valve (2) of the four-stage extraction steam to the low-pressure steam supply header, and control the four-stage extraction steam to pass through the four extraction heat exchanger for heat storage, so that the heat-stored steam can enter the low-pressure steam supply header again to meet the low-pressure heating demand.

8. The operation control method for coupled molten salt energy storage cogeneration units according to claim 1, characterized in that, Also includes: If the unit's operating mode is determined to be the peak mode, close the extraction valve (1) from the heat reheat to the medium-pressure steam supply header, close the extraction valve (2) from the fourth extraction to the low-pressure steam supply header, close the extraction valve (3) from the heat reheat to the low-pressure steam supply header, open the extraction valve (4) from the molten salt steam generator to the medium-pressure steam supply header, open the extraction valve (5) from the molten salt steam generator to the low-pressure steam supply header, and control the steam generated by the molten salt steam generator to enter the medium-pressure steam supply header and the low-pressure steam supply header respectively.

9. A control device for the operation of a coupled molten salt energy storage cogeneration unit, characterized in that, include: The power prediction model construction unit is used to input the acquired main steam flow rate of the unit and the heating parameters at any time into the pre-constructed predicted power generation model to obtain the upper and lower limits of the predicted power generation at any time; wherein, the predicted power generation model is obtained by training a linear model using the historical power generation of the unit and the corresponding heating parameters. The operation mode determination unit is used to determine the unit operation mode based on the actual power generation at a given time and the upper and lower limits of the predicted power generation at that time; wherein, the unit operation mode includes heating mode, peak mode and deep peak shaving mode; The deep peak shaving module is used to determine the target average steam supply flow from the molten salt steam generator to the low-pressure steam supply header based on the molten salt heat storage capacity, and to perform deep peak shaving on the unit based on the target average steam supply flow if the unit operation mode is determined to be the deep peak shaving mode.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the operation control method for coupled molten salt energy storage cogeneration units as described in any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the operation control method for coupled molten salt energy storage cogeneration units as described in any one of claims 1 to 8.

12. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the operation control method for coupled molten salt energy storage cogeneration units as described in any one of claims 1 to 8.

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