A coal-fired power plant operation control method and system based on molten salt heat storage

Abstract

The present invention provides a coal-fired power plant operation control method and system based on molten salt heat storage, which belongs to the field of data processing technology, and specifically comprises: determining historical frequency modulation data at different frequency modulation depths according to the analysis results of historical peak-shaving data, and determining the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system; when the capacity matching coefficient meets the requirements, obtaining the power generation processing efficiency of the coal-fired power plant under the unit operation load in a specified period of time, and determining the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system, thereby improving the reliability of the operation of the molten salt heat storage device.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal-fired power plants, and in particular relates to a method and system for controlling the operation of a coal-fired power plant based on molten salt heat storage. Background Art

[0002] Molten salt thermal storage technology is a technology that uses the temperature difference of molten salt during the heating and cooling process to achieve thermal energy storage. Molten salt is a molten body formed by melting salts, usually composed of alkali metals, alkaline earth metal halides, nitrates, sulfates, etc. These molten salts have high heat capacity and good thermal conductivity, and are suitable for large-scale energy storage.

[0003] In order to realize the peak-shaving processing of coal-fired power units based on molten salt heat storage systems in the existing technical solutions, the invention patent application CN202410861105.X "A method and system for controlling the operation of molten salt heat storage coal-fired units in coal-fired power plants" controls the operation of molten salt heat storage coal-fired units in coal-fired power plants through heat storage strategies and preset heat release strategies, thereby increasing the peak-shaving depth of target coal-fired units, and solving the existing lack of strategies for deep peak-shaving of the operating status of coal-fired power plant units. However, at the same time, the following technical problems exist: The existing technical solutions ignore the adjustment of the operation control mode of the molten salt heat storage system in different time periods according to the analysis results of the operation data of the coal-fired power plant, which makes it difficult to meet the flexibility of the operation control of the molten salt energy storage system.

[0004] In response to the above technical problems, the present invention provides a coal-fired power plant operation control method and system based on molten salt heat storage. Summary of the invention

[0005] A method for controlling operation of a coal-fired power plant based on molten salt heat storage, specifically comprising: S1 obtains the remaining energy storage capacity of the molten salt heat storage system, and determines the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity. When it is determined that the remaining energy storage capacity of the molten salt heat storage system meets the requirements, proceeds to the next step; S2 determines, based on the historical peak-shaving data and weather data of the coal-fired power plant, that the frequency of peak-shaving processing of the coal-fired power plant in the specified period is within a preset range, and then proceeds to the next step; S3 determines the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determines the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system, and when the capacity matching coefficient meets the requirements, proceeds to the next step; S4 obtains the power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time, and determines the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system.

[0006] The beneficial effects of the present invention are: The output power change of the molten salt heat storage system within the preset capacity range centered on the remaining energy storage capacity is used to determine whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements, thereby realizing the screening of molten salt energy storage systems with low remaining energy storage capacity or low output power within the preset capacity range, so that the molten salt heat storage system can directly work in the energy storage mode, thereby improving the reliability and stability of the energy storage regulation of the molten salt heat storage system.

[0007] The working mode of the molten salt heat storage system is determined based on the power generation efficiency of the coal-fired power plant under the unit operating load in a specified period of time and the capacity matching coefficient of the molten salt heat storage system. It takes into account the impact of working in energy storage mode on the power generation efficiency of the coal-fired power plant, and also takes into account the matching of the molten salt heat storage system with the peak demand, thereby realizing the determination of the working mode from multiple angles and ensuring the working reliability of the coal-fired power plant.

[0008] A further technical solution is that the remaining energy storage capacity of the molten salt heat storage system is determined based on the analysis results of monitoring data of a capacity monitoring device of the molten salt heat storage system.

[0009] A further technical solution is that the preset capacity interval is determined according to the analysis results of the historical peak-shaving data of the molten salt heat storage system, and is specifically determined according to the peak-shaving capacity range of different historical peak-shaving times.

[0010] A further technical solution is that the change in the output power of the molten salt heat storage system is determined based on the historical output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity.

[0011] A further technical solution is to determine whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements, specifically including: The change of the output power of the molten salt heat storage system within the preset capacity interval centered on the remaining energy storage capacity, determine the number of energy storage adjustments at which the change rate of the output power of the molten salt heat storage system is greater than the preset change rate, and use it as the number of abnormal adjustments; Determine the abnormal variation coefficients of different abnormal adjustment times according to the variation rates of the output powers of different abnormal adjustment times; The comprehensive abnormal coefficient of the molten salt heat storage system is determined by the abnormal variation coefficient of different abnormal adjustment times, and whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements is determined according to the comprehensive abnormal coefficient.

[0012] A further technical solution is that the method for determining the working mode of the molten salt heat storage system is: Determining the reference operating load range based on the operating load of the units of the coal-fired power plant in a specified period of time; Determining a power generation efficiency adjustment coefficient according to a deviation between the power generation processing efficiency in a reference operating load interval and the power generation processing efficiency under the operating load of the unit; The energy storage demand coefficient of the molten salt heat storage system is determined according to the power generation efficiency adjustment coefficient and the capacity matching coefficient, and based on the energy storage demand coefficient, it is determined whether the molten salt heat storage system needs to operate in the energy storage mode.

[0013] A further technical solution is that the reference operating load interval is a load interval whose deviation from the unit operating load is within a preset load deviation range.

[0014] A further technical solution is that the power generation efficiency adjustment coefficient is determined according to a preset proportional coefficient based on the deviation between the power generation processing efficiency and the power generation processing efficiency under the operating load of the unit.

[0015] A further technical solution is that the energy storage demand coefficient of the molten salt heat storage system is determined according to the average value of the power generation efficiency adjustment coefficient and the capacity matching coefficient.

[0016] On the other hand, an embodiment of the present application provides a coal-fired power plant operation control system based on molten salt heat storage, which adopts the above-mentioned coal-fired power plant operation control method based on molten salt heat storage, and is characterized in that it specifically includes: Energy storage capacity assessment module, frequency assessment module, matching coefficient assessment module, working mode output module; The energy storage capacity evaluation module is responsible for obtaining the remaining energy storage capacity of the molten salt heat storage system, and determining whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements based on the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity; The frequency evaluation module is responsible for determining whether the frequency of peak load processing of the coal-fired power plant in a specified period is within a preset range based on the historical peak load data and weather data of the coal-fired power plant; The matching coefficient evaluation module is responsible for determining the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determining the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system; The working mode output module is responsible for obtaining the power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time, and determining the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system.

[0017] On the other hand, a computer-readable storage medium is provided in an embodiment of the present application, on which a computer program is stored. When the computer program is executed in a computer, the computer is caused to execute the above-mentioned method for controlling operation of a coal-fired power plant based on molten salt heat storage.

[0018] On the other hand, a computer program product is provided in an embodiment of the present application, characterized in that the computer program product stores instructions, and when the instructions are executed by a computer, the computer implements the above-mentioned coal-fired power plant operation control method based on molten salt heat storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0020] Figure 1 The present invention is a flow chart of a method for controlling the operation of a coal-fired power plant based on molten salt heat storage.

[0021] Figure 2 It is a flow chart for determining that the remaining energy storage capacity of the molten salt thermal storage system meets the requirements; Figure 3 It is a flow chart of a method for determining the frequency of peak load regulation of a coal-fired power plant during a specified period of time. DETAILED DESCRIPTION

[0022] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of ways and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0023] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0024] Example 1 To solve the above problems, according to one aspect of the present invention, Figure 1 As shown, a method for controlling the operation of a coal-fired power plant based on molten salt heat storage is provided, which specifically includes: S1 obtains the remaining energy storage capacity of the molten salt heat storage system, and determines the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity. When it is determined that the remaining energy storage capacity of the molten salt heat storage system meets the requirements, proceeds to the next step; S2 determines, based on the historical peak-shaving data and weather data of the coal-fired power plant, that the frequency of peak-shaving processing of the coal-fired power plant in the specified period is within a preset range, and then proceeds to the next step; S3 determines the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determines the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system, and when the capacity matching coefficient meets the requirements, proceeds to the next step; S4 obtains the power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time, and determines the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system.

[0025] Furthermore, the remaining energy storage capacity of the molten salt heat storage system is determined based on the analysis results of the monitoring data of the capacity monitoring device of the molten salt heat storage system.

[0026] Specifically, the preset capacity interval is determined according to the analysis results of the historical peak-shaving data of the molten salt heat storage system, and is specifically determined according to the peak-shaving capacity range of different historical peak-shaving times.

[0027] It should be noted that the change in the output power of the molten salt heat storage system is determined according to the historical output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity.

[0028] It is understandable that if Figure 2 As shown, determining that the remaining energy storage capacity of the molten salt thermal storage system meets the requirements specifically includes: The change of the output power of the molten salt heat storage system within the preset capacity interval centered on the remaining energy storage capacity, determine the number of energy storage adjustments at which the change rate of the output power of the molten salt heat storage system is greater than the preset change rate, and use it as the number of abnormal adjustments; Determine the abnormal variation coefficients of different abnormal adjustment times according to the variation rates of the output powers of different abnormal adjustment times; The comprehensive abnormal coefficient of the molten salt heat storage system is determined by the abnormal variation coefficient of different abnormal adjustment times, and whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements is determined according to the comprehensive abnormal coefficient.

[0029] Optionally, in addition to considering the remaining energy storage capacity of the molten salt heat storage system, it is also necessary to consider the medium, temperature and pressure of the molten salt heat storage system. Specifically, the output power of the molten salt heat storage system is determined based on the remaining energy storage capacity and the same medium, when the temperature and pressure deviations are within a preset deviation range.

[0030] Furthermore, the abnormal variation coefficient is determined according to a preset variation rate interval in which the variation rate of the output power with different abnormal adjustment times is located, and specifically, a preset variation coefficient corresponding to the preset variation rate interval is determined.

[0031] It should be noted that the comprehensive abnormality coefficient of the molten salt heat storage system is determined according to the weighted sum of the abnormality variation coefficients of different abnormal adjustment times.

[0032] It can be understood that when the comprehensive abnormal coefficient is not within the preset abnormal coefficient range, it is determined that the remaining energy storage capacity of the molten salt heat storage system does not meet the requirements.

[0033] Specifically, when the remaining energy storage capacity of the molten salt heat storage system does not meet the requirements, it is determined that the working mode of the molten salt heat storage system is the energy storage mode.

[0034] In another embodiment, determining that the remaining energy storage capacity of the molten salt thermal storage system meets the requirements specifically includes: The change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity is used to determine that there is no energy storage adjustment number with a change rate of the output power greater than the preset change rate of the molten salt heat storage system. When there is no energy storage adjustment number with a change rate of the output power greater than the preset change rate, it is determined that the remaining energy storage capacity of the molten salt heat storage system meets the requirements; When the output power change rate is greater than the preset change rate, the energy storage adjustment times are: The number of energy storage adjustments at which the output power change rate is greater than the preset change rate is taken as the number of abnormal adjustments. When the number of abnormal changes is greater than the preset number threshold, it is determined that the remaining energy storage capacity of the molten salt heat storage system does not meet the requirements. When the number of abnormal changes is not greater than the preset number threshold: Determine the abnormal variation coefficients of different abnormal adjustment times according to the change rates of the output power of different abnormal adjustment times, and when there is no abnormal variation number with an abnormal variation coefficient greater than a preset abnormal coefficient, determine that the remaining energy storage capacity of the molten salt heat storage system meets the requirements; When there is an abnormal change coefficient greater than the preset abnormal change coefficient: The number of abnormal changes in which the abnormal change coefficient is greater than the preset abnormal change coefficient is used as the screening change number, and when the screening change number does not meet the requirement, it is determined that the remaining energy storage capacity of the molten salt heat storage system does not meet the requirement; When the number of screening changes meets the requirements: The comprehensive abnormal coefficient of the molten salt heat storage system is determined by the abnormal variation coefficient of different abnormal adjustment times, and whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements is determined according to the comprehensive abnormal coefficient.

[0035] Specifically, Figure 3 As shown, the method for determining the frequency of peak load regulation of the coal-fired power plant in a specified period is: Determining a historical reference period for the designated period of time of the coal-fired power plant based on the weather data for the designated period of time; Determine the historical peak-shaving times for different historical reference periods according to the historical peak-shaving data for different historical reference periods; The average peak-shaving times are determined by averaging the historical peak-shaving times in different historical reference periods, and the frequency of the peak-shaving process of the coal-fired power plant in a specified period is determined based on the average peak-shaving times.

[0036] Furthermore, the historical reference period is a period in which the deviations of weather data in different dimensions from the specified period are all within a preset range.

[0037] It should also be noted that the frequency of the peak-shaving process of the coal-fired power plant in a specified period is determined according to the ratio of the average peak-shaving times to the preset peak-shaving times.

[0038] Optionally, when the frequency of peak load regulation of the coal-fired power plant in a specified period is not within a preset range, the operating mode of the molten salt heat storage system is determined to be the energy storage regulation mode.

[0039] Specifically, the method for determining the frequency of peak load regulation of the coal-fired power plant in a specified period is as follows: Determining a historical reference period for the designated period of time of the coal-fired power plant based on the weather data for the designated period of time; Determine the historical peak-shaving times for different historical reference periods according to the historical peak-shaving data for different historical reference periods; The historical reference period whose historical peak-shaving number is greater than the preset peak-shaving number is determined by using the historical peak-shaving number of different historical reference periods, and is used as the peak-shaving period. The frequency of peak-shaving processing of the coal-fired power plant in the specified period is determined based on the proportion of the peak-shaving period in the historical reference period.

[0040] Optionally, the method for determining the frequency of peak load regulation of the coal-fired power plant in a specified period is: S21 determines the historical reference period of the designated period of the coal-fired power plant based on the weather data of the designated period, determines the historical peak-shaving times of different historical reference periods according to the historical peak-shaving data of different historical reference periods, and determines the basic frequency coefficient using the proportion of the number of historical reference periods with historical peak-shaving times; S22 determines the frequency modulation frequent compensation coefficient of different historical reference periods according to the historical peak modulation times of different historical reference periods; S23 determines the frequency of peak load regulation of the coal-fired power plant in a specified period based on the sum of the frequency regulation compensation coefficients of different historical reference periods and the basic frequency coefficient.

[0041] Optionally, the above step S21 includes steps S211-S213, which are specifically: S211 determines the historical reference period of the designated period of the coal-fired power plant based on the weather data of the designated period. When the number of the historical reference periods is less than the number of preset reference periods, it is determined that the frequency of peak load regulation of the coal-fired power plant in the designated period does not meet the requirement. When the number of the historical reference periods is not less than the number of preset reference periods, the process proceeds to step S212. S212 determines the total number of historical peak-shaving times in the historical reference period according to the number of historical peak-shaving times in different historical reference periods. When the total number of historical peak-shaving times does not meet the requirement, it is determined that the frequency of peak-shaving processing of the coal-fired power plant in the specified period does not meet the requirement. When the total number of historical peak-shaving times meets the requirement, the process proceeds to step S213; S213 determines the basic frequency coefficient using the proportion of the number of historical reference time periods with historical peak-shaving times. When the basic frequency coefficient is not within the preset frequency coefficient range, it is determined that the frequency of peak-shaving processing of the coal-fired power plant in the specified time period does not meet the requirements. When the basic frequency coefficient is within the preset frequency coefficient range, proceed to step S22.

[0042] Optionally, the above step S22 includes steps S221-S222, which are specifically: S221 determines the historical reference period whose historical peak-shaving number is greater than the preset peak-shaving number threshold through the historical peak-shaving number of different historical reference periods, and uses it as the frequent peak-shaving reference period. When the number of the frequent peak-shaving reference periods is greater than the preset number of frequent periods, it is determined that the frequency of the peak-shaving process of the coal-fired power plant in the specified period does not meet the requirements. When the number of the frequent peak-shaving reference periods is not greater than the preset number of frequent periods, it proceeds to step S222; S222 determines the frequency modulation frequency coefficient based on the historical peak modulation times of different frequent frequency modulation reference periods and the number of frequent frequency modulation reference periods. When the frequency modulation frequency coefficient does not meet the requirement, it is determined that the frequency of peak modulation processing of the coal-fired power plant in the specified period does not meet the requirement. When the frequency modulation frequency coefficient meets the requirement, the process proceeds to step S223. S223 determines the frequency modulation frequent compensation coefficient of different historical reference periods according to the historical peak modulation times of different historical reference periods, and proceeds to step S23.

[0043] Specifically, the method for determining the capacity matching coefficient of the molten salt heat storage system is: Based on the historical frequency modulation data at different frequency modulation depths, determining the number of historical frequency modulations at different frequency modulation depths; According to the matching frequency modulation power under different frequency modulation depths, the frequency modulation duration of the frequency modulation power corresponding to the remaining energy storage capacity of the molten salt heat storage system is determined, and the matching coefficient under different frequency modulation depths is performed based on the frequency modulation duration; The weight coefficients of different frequency modulation depths are determined based on the historical frequency modulation times at different frequency modulation depths, and the capacity matching coefficient of the molten salt heat storage system is determined in combination with the matching coefficients at different frequency modulation depths.

[0044] Optionally, the frequency modulation duration of the frequency modulation power corresponding to the remaining energy storage capacity of the molten salt heat storage system is related to the heat, pressure and temperature of the heat storage tank of the molten salt energy storage system, and is specifically determined by the average value of the historical output duration of the molten salt energy storage system at the frequency modulation power under the heat, pressure and temperature of the heat storage tank.

[0045] Furthermore, the weight coefficient is determined according to the ratio of the historical frequency modulation times at different frequency modulation depths to a preset frequency modulation times threshold.

[0046] It should also be noted that the matching coefficient is determined according to the ratio of the FM duration at different FM depths to the preset FM duration.

[0047] Furthermore, the capacity matching coefficient of the molten salt heat storage system has a value range between 0 and 1, and when the capacity matching coefficient is greater than a preset capacity matching coefficient threshold, it is determined that the capacity matching coefficient of the molten salt heat storage system does not meet the requirements.

[0048] It can be understood that when the capacity matching coefficient of the molten salt heat storage system does not meet the requirements, the working mode of the molten salt heat storage system is determined to be the energy storage mode.

[0049] In another embodiment, the method for determining the capacity matching coefficient of the molten salt heat storage system is: According to the matching frequency modulation power under different frequency modulation depths, the frequency modulation duration of the frequency modulation power corresponding to the remaining energy storage capacity of the molten salt heat storage system is determined, and the matching coefficient under different frequency modulation depths is performed based on the frequency modulation duration. When there is a frequency modulation depth whose matching coefficient does not meet the requirements: The frequency modulation depth whose matching coefficient does not meet the requirement is used as the screening frequency modulation depth, and the total number of historical frequency modulations of the screening frequency modulation depth is determined by the number of historical frequency modulations of different screening frequency modulation depths. When the total number of historical frequency modulations of the screening frequency modulation depth does not meet the requirement, it is determined that the capacity matching coefficient of the molten salt heat storage system does not meet the requirement; When the total number of historical frequency modulations for the frequency modulation depth screening meets the requirements: Determine the weight coefficients of different screening frequency modulation depths according to the number of historical frequency modulations of different screening frequency modulation depths, and when the number of screening frequency modulation depths whose weight coefficients are greater than the preset weight coefficients does not meet the requirements, it is determined that the capacity matching coefficient of the molten salt heat storage system does not meet the requirements; When the number of filtered FM depths with weight coefficients greater than the preset weight coefficients meets the requirements: The modified matching coefficients of different screening FM depths are determined by multiplying the weight coefficients of different screening FM depths by the matching coefficients. When the number of screening FM depths whose modified matching coefficients are less than the preset matching coefficient threshold does not meet the requirements: It is determined that the capacity matching coefficient of the molten salt heat storage system does not meet the requirements; When there is no FM depth whose matching coefficient does not meet the requirement or when the number of screened FM depths whose corrected matching coefficient is less than the preset matching coefficient threshold meets the requirement: The weight coefficients of different frequency modulation depths are determined based on the historical frequency modulation times at different frequency modulation depths, and the capacity matching coefficient of the molten salt heat storage system is determined in combination with the matching coefficients at different frequency modulation depths.

[0050] Specifically, the method for determining the working mode of the molten salt heat storage system is: Determining the reference operating load range based on the operating load of the units of the coal-fired power plant in a specified period of time; Determining a power generation efficiency adjustment coefficient according to a deviation between the power generation efficiency in a reference operating load interval and the power generation efficiency under the operating load of the unit; The energy storage demand coefficient of the molten salt heat storage system is determined according to the power generation efficiency adjustment coefficient and the capacity matching coefficient, and based on the energy storage demand coefficient, it is determined whether the molten salt heat storage system needs to operate in the energy storage mode.

[0051] Furthermore, the reference operating load interval is a load interval whose deviation from the unit operating load is within a preset load deviation range.

[0052] Furthermore, the power generation efficiency adjustment coefficient is determined according to a preset proportional coefficient based on the deviation between the power generation processing efficiency and the power generation processing efficiency under the operating load of the unit.

[0053] Optionally, the energy storage demand coefficient of the molten salt heat storage system is determined based on an average value of the power generation efficiency adjustment coefficient and the capacity matching coefficient.

[0054] Example 2 On the other hand, an embodiment of the present application provides a coal-fired power plant operation control system based on molten salt heat storage, which adopts the above-mentioned coal-fired power plant operation control method based on molten salt heat storage, and is characterized in that it specifically includes: Energy storage capacity assessment module, frequency assessment module, matching coefficient assessment module, working mode output module; The energy storage capacity evaluation module is responsible for obtaining the remaining energy storage capacity of the molten salt heat storage system, and determining whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements based on the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity; The frequency evaluation module is responsible for determining whether the frequency of peak load processing of the coal-fired power plant in a specified period is within a preset range based on the historical peak load data and weather data of the coal-fired power plant; The matching coefficient evaluation module is responsible for determining the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determining the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system; The working mode output module is responsible for obtaining the power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time, and determining the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system.

[0055] Example 3 On the other hand, a computer-readable storage medium is provided in an embodiment of the present application, on which a computer program is stored. When the computer program is executed in a computer, the computer is caused to execute the above-mentioned method for controlling operation of a coal-fired power plant based on molten salt heat storage.

[0056] Example 4 On the other hand, a computer program product is provided in an embodiment of the present application, characterized in that the computer program product stores instructions, and when the instructions are executed by a computer, the computer implements the above-mentioned coal-fired power plant operation control method based on molten salt heat storage.

[0057] In the embodiments of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0058] In the description of the embodiments of the present invention, it needs to be understood that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0059] In the description of this specification, the description of the terms "one embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling the operation of a coal-fired power plant based on molten salt heat storage, characterized in that: Specifically include: Obtain the remaining energy storage capacity of the molten salt heat storage system, and the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity, and when it is determined that the remaining energy storage capacity of the molten salt heat storage system meets the requirements, proceed to the next step; When it is determined based on the historical peak-shaving data and weather data of the coal-fired power plant that the frequency of the peak-shaving process of the coal-fired power plant in the specified period is within a preset range, proceed to the next step; Determine the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determine the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system, and when the capacity matching coefficient meets the requirements, proceed to the next step; The power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time is obtained, and the working mode of the molten salt heat storage system is determined in combination with the capacity matching coefficient of the molten salt heat storage system.

2. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 1, characterized in that: The remaining energy storage capacity of the molten salt heat storage system is determined based on the analysis results of the monitoring data of the capacity monitoring device of the molten salt heat storage system.

3. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 1, characterized in that: The preset capacity interval is determined according to the analysis results of the historical peak-shaving data of the molten salt heat storage system, and is specifically determined according to the peak-shaving capacity range of different historical peak-shaving times.

4. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 1, characterized in that: The change in the output power of the molten salt heat storage system is determined based on the historical output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity.

5. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 1, characterized in that: Determining that the remaining energy storage capacity of the molten salt heat storage system meets the requirements specifically includes: The change of the output power of the molten salt heat storage system within the preset capacity interval centered on the remaining energy storage capacity, determine the number of energy storage adjustments at which the change rate of the output power of the molten salt heat storage system is greater than the preset change rate, and use it as the number of abnormal adjustments; Determine the abnormal variation coefficients of different abnormal adjustment times according to the variation rates of the output powers of different abnormal adjustment times; The comprehensive abnormal coefficient of the molten salt heat storage system is determined by the abnormal variation coefficient of different abnormal adjustment times, and whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements is determined according to the comprehensive abnormal coefficient.

6. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 5, characterized in that: The abnormal variation coefficient is determined according to the preset variation rate interval in which the variation rate of the output power with different abnormal adjustment times is located, and specifically, the preset variation coefficient corresponding to the preset variation rate interval is determined.

7. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 5, characterized in that: The comprehensive abnormality coefficient of the molten salt heat storage system is determined according to the weighted sum of the abnormality variation coefficients of different abnormal adjustment times.

8. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 1, characterized in that: The method for determining the capacity matching coefficient of the molten salt heat storage system is: Based on the historical frequency modulation data at different frequency modulation depths, determining the number of historical frequency modulations at different frequency modulation depths; According to the matching frequency modulation power under different frequency modulation depths, the frequency modulation duration of the frequency modulation power corresponding to the remaining energy storage capacity of the molten salt heat storage system is determined, and the matching coefficient under different frequency modulation depths is performed based on the frequency modulation duration; The weight coefficients of different frequency modulation depths are determined based on the historical frequency modulation times at different frequency modulation depths, and the capacity matching coefficient of the molten salt heat storage system is determined in combination with the matching coefficients at different frequency modulation depths.

9. The method for controlling the operation of a coal-fired power plant based on molten salt heat storage according to claim 8, characterized in that: The capacity matching coefficient of the molten salt heat storage system has a value range of 0 to 1. When the capacity matching coefficient is greater than a preset capacity matching coefficient threshold, it is determined that the capacity matching coefficient of the molten salt heat storage system does not meet the requirements.

10. A coal-fired power plant operation control system based on molten salt heat storage, adopting a coal-fired power plant operation control method based on molten salt heat storage according to any one of claims 1 to 9, characterized in that: Specifically include: Energy storage capacity assessment module, frequency assessment module, matching coefficient assessment module, working mode output module; The energy storage capacity evaluation module is responsible for obtaining the remaining energy storage capacity of the molten salt heat storage system, and determining whether the remaining energy storage capacity of the molten salt heat storage system meets the requirements based on the change of the output power of the molten salt heat storage system within a preset capacity interval centered on the remaining energy storage capacity; The frequency evaluation module is responsible for determining whether the frequency of peak load processing of the coal-fired power plant in a specified period is within a preset range based on the historical peak load data and weather data of the coal-fired power plant; The matching coefficient evaluation module is responsible for determining the historical frequency regulation data at different frequency regulation depths according to the analysis results of the historical peak regulation data, and determining the capacity matching coefficient of the molten salt heat storage system in combination with the remaining energy storage capacity of the molten salt heat storage system; The working mode output module is responsible for obtaining the power generation processing efficiency of the coal-fired power plant under the unit operating load in a specified period of time, and determining the working mode of the molten salt heat storage system in combination with the capacity matching coefficient of the molten salt heat storage system.

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