Photovoltaic-thermal integrated solar tower energy supply method and system

Abstract

The present invention relates to the field of solar power generation technology, and specifically discloses a photovoltaic-thermal integrated solar tower energy supply method and system, the method comprising: heat conversion evaluation value determination, electric energy conversion evaluation value determination, and energy supply status feedback, firstly determining the heat conversion evaluation value of the collector, matching to obtain the heat energy storage limit of the collector, determining the electric energy conversion evaluation value of the photovoltaic panel assembly, thereby matching to obtain the electric energy storage limit of the photovoltaic panel assembly, matching the energy demand type and energy demand limit of the energy supply area, and determining the energy storage remaining amount of the solar tower, which can ensure the precise matching between energy supply and demand, reduce energy waste, and make energy utilization more efficient, and finally provide feedback on the energy supply status of the solar tower, which helps to timely discover problems in the solar tower energy supply process, thereby improving the overall operation efficiency of the solar tower energy supply system.

Description

Technical Field

[0001] The present invention relates to the field of solar power generation technology, and in particular to a photovoltaic-thermal integrated solar tower energy supply method and system. Background Art

[0002] Current solar power generation technology, as an important part of the clean energy field, has developed rapidly around the world in recent years. Its core technologies mainly include photovoltaic power generation and solar thermal power generation. Due to the limited conversion efficiency of solar panels, most of the energy is lost during the conversion process, resulting in low conversion efficiency. In addition, solar power generation technology is greatly affected by climatic and environmental factors. Long-term rainy, snowy, cloudy, foggy and even cloud changes will seriously affect the power generation status of the solar power generation system.

[0003] For example, the invention patent with announcement number CN106452292B discloses an integrated photovoltaic and thermal solar tower, comprising a heat collecting shed, a tower extending upward from the center of the heat collecting shed, a generator and a turbine arranged in the lower area of ​​the tower, and the turbine is installed below the generator, wherein: the heat collecting shed is a flat-top conical structure, which is made of transparent photovoltaic modules spliced ​​together, and is supported by support columns below, so that the heat collecting shed is at a certain height from the ground to form a heat collecting area, and a cold water pool and a hot water pool are provided in the heat collecting area below the heat collecting shed. The above application provides an integrated photovoltaic and thermal solar tower, which can utilize both photovoltaic and thermal power generation, and improve the utilization rate of solar energy without increasing the floor area.

[0004] Combining the above technical solutions, it is found that with the continuous development of the solar thermal power generation industry, more reliable, efficient and comprehensive solar power generation technology solutions need to be organized. However, most solar power generation technologies only consider a single factor affecting solar power generation and cannot explain its high utilization rate. As a result, there is a problem of low energy conversion efficiency in solar towers, which ultimately affects the use of solar energy. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a photovoltaic-thermal integrated solar tower energy supply method and system, which can effectively solve the problems involved in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The first aspect of the present invention provides a photovoltaic-thermal integrated solar tower power supply method, including: thermal energy conversion evaluation value determination: monitoring the energy conversion process of the collector, obtaining the thermal energy conversion data of the collector, determining the thermal energy conversion evaluation value of the collector, and thereby matching the thermal energy storage limit of the collector, and recording it as the first energy storage limit of the solar tower, and at the same time recording the storage type corresponding to the thermal energy storage limit of the collector as the first energy storage type of the solar tower; electric energy conversion evaluation value determination: monitoring the energy conversion process of the photovoltaic panel assembly, obtaining the photoelectric conversion data of the solar panel assembly, and determining the thermal energy conversion evaluation value of the solar panel assembly. The electric energy conversion data of the photovoltaic panel assembly is used to determine the electric energy conversion evaluation value of the photovoltaic panel assembly, and the electric energy storage limit of the photovoltaic panel assembly is matched to obtain the electric energy storage limit of the photovoltaic panel assembly, and recorded as the second energy storage limit of the solar tower. At the same time, the storage type corresponding to the electric energy storage limit of the photovoltaic panel assembly is recorded as the second energy storage type of the solar tower; energy supply status feedback: obtain the energy demand data set of the energy supply area, match the energy demand type of the energy supply area and the energy demand limit of the energy supply area, compare them with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower, and finally provide feedback on the energy supply status of the solar tower.

[0007] As a further method, the thermal energy conversion evaluation value of the collector is determined, and the specific determination process is as follows: extracting the length and width of the collector heliostat from the thermal energy conversion data of the collector, and obtaining the heat collection surface area of ​​the collector heliostat through the area formula; extracting each energy conversion time point of the collector according to the thermal energy conversion data of the collector, obtaining the solar radiation intensity value of the collector at each energy conversion time point, and performing average processing to obtain the average solar radiation intensity of the collector during the energy conversion cycle; obtaining the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle from the thermal energy conversion data of the collector, performing curve offset comparison with the ambient suitable temperature curve of the working area of ​​the collector during the energy conversion cycle predefined in the energy supply information database, and counting and accumulating the ambient temperature deviation values ​​of the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle on the vertical axis to obtain the total ambient temperature deviation value of the working area of ​​the collector during the energy conversion cycle; and comprehensively analyzing to obtain the thermal energy conversion evaluation value of the collector.

[0008] As a further method, the matching obtains the thermal energy storage limit of the collector. The specific matching process is: matching the thermal energy conversion evaluation value of the collector with the thermal energy storage limit corresponding to each predefined thermal energy conversion evaluation value interval, so as to obtain the thermal energy storage limit of the collector.

[0009] As a further method, the electric energy conversion evaluation value of the photovoltaic panel assembly is determined, and the specific determination process is: based on the electric energy conversion data of the photovoltaic panel assembly, the sunshine durations of the working area to which the photovoltaic panel assembly belongs within the energy conversion cycle are extracted, and the average processing is performed to obtain the average sunshine duration of the working area to which the photovoltaic panel assembly belongs within the energy conversion cycle; the energy conversion time point corresponding to the maximum power of the photovoltaic panel assembly within the energy conversion cycle is extracted from the electric energy conversion data of the photovoltaic panel assembly, and the output current of the photovoltaic panel assembly at the energy conversion time point is obtained from the electric energy conversion data of the photovoltaic panel assembly, which is recorded as the maximum power point current of the photovoltaic panel assembly within the energy conversion cycle; based on the electric energy conversion data of the photovoltaic panel assembly, the average ambient temperature of the working area to which the photovoltaic panel assembly belongs within the energy conversion cycle is extracted, and multiplied by the influence factor corresponding to the ambient temperature unit value predefined in the energy supply information library to obtain the ambient temperature coefficient of the working area to which the photovoltaic panel assembly belongs within the energy conversion cycle; the ambient temperature reference coefficient is extracted from the energy supply information library, and the electric energy conversion evaluation value of the photovoltaic panel assembly is obtained through comprehensive analysis.

[0010] As a further method, the matching obtains the electric energy storage limit amount of the photovoltaic panel assembly. The specific matching process is: matching the electric energy conversion evaluation value of the photovoltaic panel assembly with the electric energy storage limit amount corresponding to each predefined electric energy conversion evaluation value interval, so as to obtain the electric energy storage limit amount of the photovoltaic panel assembly.

[0011] As a further method, the energy demand type of the energy supply area and the energy demand definition amount of the energy supply area are matched. The specific matching process is: according to the energy demand data set of the energy supply area, the energy demand type corresponding to each predefined energy demand data set is matched to obtain the energy demand type of the energy supply area; according to the energy demand data set of the energy supply area, the energy demand definition amount corresponding to each predefined energy demand data set is matched to obtain the energy demand definition amount of the energy supply area.

[0012] As a further method, the energy supply status of the solar tower is fed back, and the specific feedback process is: the first energy storage type of the solar tower and the second energy storage type of the solar tower are collectively referred to as the energy storage type of the solar tower; the energy demand type of the energy supply area is compared with the energy storage type of the solar tower; if the energy demand type of the energy supply area is the first energy storage type of the solar tower, the first energy storage limit amount of the solar tower is differenced with the energy demand limit amount of the energy supply area to obtain the energy storage remaining amount of the solar tower, thereby feeding back the energy supply status of the solar tower; if the energy demand type of the energy supply area is the first energy storage type of the solar tower, the difference between the first energy storage limit amount of the solar tower and the energy demand limit amount of the energy supply area is processed to obtain the energy storage remaining amount of the solar tower, thereby feeding back the energy supply status of the solar tower; If the demand type is the second energy storage type of the solar tower, the second energy storage limit amount of the solar tower and the energy demand limit amount of the energy supply area are subtracted to obtain the remaining energy storage amount of the solar tower, thereby providing feedback on the energy supply status of the solar tower; if the energy demand type of the energy supply area includes the first energy storage type of the solar tower and the second energy storage type of the solar tower, the first energy storage limit amount and the second energy storage limit amount of the solar tower are subtracted from the energy demand limit amount of the energy supply area respectively, and the sum is used to obtain the remaining energy storage amount of the solar tower, thereby providing feedback on the energy supply status of the solar tower.

[0013] The second aspect of the present invention provides a photovoltaic-thermal integrated solar tower energy supply system, including: a thermal energy conversion evaluation value determination module, which is used to monitor the energy conversion process of the collector, obtain the thermal energy conversion data of the collector, and determine the thermal energy conversion evaluation value of the collector, thereby matching the thermal energy storage limit of the collector and recording it as the first energy storage limit of the solar tower, and at the same time, the storage type corresponding to the thermal energy storage limit of the collector is recorded as the first energy storage type of the solar tower; an electric energy conversion evaluation value determination module, which is used to monitor the energy conversion process of the photovoltaic panel assembly, obtain the electric energy conversion data of the photovoltaic panel assembly According to the data, the electric energy conversion evaluation value of the photovoltaic panel assembly is determined, and the electric energy storage limit of the photovoltaic panel assembly is matched to obtain the same, and recorded as the second energy storage limit of the solar tower. At the same time, the storage type corresponding to the electric energy storage limit of the photovoltaic panel assembly is recorded as the second energy storage type of the solar tower; the energy supply status feedback module is used to obtain the energy demand data set of the energy supply area, match the energy demand type of the energy supply area and the energy demand limit of the energy supply area, compare them with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower, and finally provide feedback on the energy supply status of the solar tower.

[0014] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0015] (1) The present invention provides a photovoltaic-thermal integrated solar tower power supply method and system. First, the thermal energy conversion evaluation value of the collector is determined, and the thermal energy storage limit of the collector is obtained by matching, and recorded as the first energy storage limit of the solar tower. The electric energy conversion evaluation value of the photovoltaic panel assembly is determined, and the electric energy storage limit of the photovoltaic panel assembly is obtained by matching, and recorded as the second energy storage limit of the solar tower. The power supply can continue when the solar radiation is insufficient or at night, ensuring the continuity and stability of solar power generation. The energy demand type and energy demand limit of the energy supply area are matched, and the remaining energy storage of the solar tower is determined. It can ensure the accurate matching between energy supply and demand, reduce energy waste, and make energy utilization more efficient. Finally, the energy supply status of the solar tower is fed back, which helps to timely discover problems in the solar tower power supply process, thereby improving the overall operation efficiency of the solar tower power supply system.

[0016] (2) The present invention can accurately understand the ability of the collector to convert solar energy into thermal energy by evaluating the thermal energy conversion evaluation value of the collector and determining the electrical energy conversion evaluation value of the photovoltaic panel assembly. Similarly, determining the electrical energy conversion evaluation value of the photovoltaic panel assembly can reflect the effect of the photovoltaic panel in converting light energy into electrical energy. By improving its conversion efficiency, the overall energy utilization efficiency of the solar tower can be improved.

[0017] (3) The present invention can make full use of different aspects of solar energy by combining photovoltaic power generation and solar thermal power generation. The combination of the two can ensure the continuity and stability of the energy supply of the solar tower. The comprehensive use of solar energy can flexibly respond to weather changes and enhance the reliability and flexibility of the solar tower energy supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0019] Figure 1 Schematic diagram of the method of the present invention.

[0020] Figure 2 This is a schematic diagram of system module connections of the present invention.

[0021] Figure 3 This is a comparison diagram of the ambient temperature curve offset involved in the present invention.

[0022] Figure 1: 1. Ambient temperature curve; 2. Ambient temperature curve. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] Reference Figure 1 As shown, the first aspect of the present invention provides a photovoltaic-thermal integrated solar tower power supply method, including: electric energy conversion evaluation value determination: monitoring the energy conversion process of the photovoltaic panel assembly, obtaining the electric energy conversion data of the photovoltaic panel assembly, and determining the electric energy conversion evaluation value of the photovoltaic panel assembly, thereby matching the electric energy storage limit amount of the photovoltaic panel assembly, and recording it as the second energy storage limit amount of the solar tower, and at the same time, recording the storage type corresponding to the electric energy storage limit amount of the photovoltaic panel assembly as the second energy storage type of the solar tower.

[0025] The electric energy conversion data of the above-mentioned photovoltaic panel assembly specifically includes the sunshine duration of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle, the maximum power of the photovoltaic panel assembly during the energy conversion cycle, the output current of the photovoltaic panel assembly at the energy conversion time point, and the average ambient temperature of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle.

[0026] Furthermore, the specific determination process of determining the electric energy conversion evaluation value of the photovoltaic panel assembly is as follows:

[0027] Based on the electric energy conversion data of the photovoltaic panel assembly, the sunshine duration of the working area of ​​the photovoltaic panel assembly within the energy conversion cycle is extracted. The sunshine duration can be monitored by a timer, and the average sunshine duration of the working area of ​​the photovoltaic panel assembly within the energy conversion cycle is obtained by averaging.

[0028] The values ​​of the sunshine duration of the working area of ​​the above photovoltaic panel components during the energy conversion cycle are shown in Table 1:

[0029] Table 1 Changes in sunshine duration

[0030] In this embodiment, according to the table of the sunshine durations of the working area to which the photovoltaic panel assembly belongs during the energy conversion cycle, the sunshine durations of the working area to which the photovoltaic panel assembly belongs during the energy conversion cycle are concentrated around 6 hours. In this embodiment, the average sunshine duration of the working area to which the photovoltaic panel assembly belongs during the energy conversion cycle is 6.2 hours.

[0031] The energy conversion time point corresponding to the maximum power of the photovoltaic panel assembly within the energy conversion cycle is extracted from the electric energy conversion data of the photovoltaic panel assembly, where the maximum power can be monitored by the power sensor of the photovoltaic panel assembly. In this way, the output current of the photovoltaic panel assembly at the energy conversion time point is obtained from the electric energy conversion data of the photovoltaic panel assembly, where the output current can be monitored by the current sensor and recorded as the maximum power point current of the photovoltaic panel assembly within the energy conversion cycle.

[0032] Based on the electric energy conversion data of the photovoltaic panel assembly, the average ambient temperature of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle is extracted. The ambient temperature can be monitored by a temperature sensor and multiplied by the influence factor corresponding to the predefined ambient temperature unit value in the energy supply information library to obtain the ambient temperature coefficient of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle.

[0033] In a specific embodiment, the impact factor corresponding to the above-mentioned ambient temperature unit value is a mapping set of ambient temperature and its corresponding impact factor constructed based on the relationship between the historical ambient temperature and the electric energy conversion evaluation value of the photovoltaic panel assembly, and the real-time ambient temperature is input into the mapping set to obtain the impact factor corresponding to the ambient temperature unit value. At the same time, its value range in this example is (0, 1).

[0034] The ambient temperature reference coefficient is extracted from the energy supply information database, and the electric energy conversion evaluation value of the photovoltaic panel component is obtained through comprehensive analysis.

[0035] Specifically, the electric energy conversion evaluation value of the photovoltaic panel assembly, in this embodiment, is obtained by comprehensively analyzing the average sunshine duration of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle, the maximum power point current of the photovoltaic panel assembly during the energy conversion cycle, and the ambient temperature coefficient of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle. This is used to determine the electric energy conversion evaluation value of the photovoltaic panel assembly. In this embodiment, a more accurate calculation method is used to obtain it. The specific expression is:

[0036] ;

[0037] In the formula is the electrical energy conversion evaluation value of the photovoltaic panel assembly. In this embodiment, it measures the ability of the photovoltaic panel assembly to convert solar energy into electrical energy.

[0038] It is the average sunshine duration of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle. It refers to the average value of the total sunshine time that can reach a certain irradiance in the working area of ​​the photovoltaic panel assembly during the energy conversion cycle. The irradiance is usually based on 120 watts per square meter measured by the meteorological station.

[0039] It is the maximum power point current of the photovoltaic panel component during the energy conversion cycle, which refers to the operating current when the photovoltaic panel component can output the maximum power during the energy conversion cycle.

[0040] It is the ambient temperature coefficient of the working area of ​​the photovoltaic panel component during the energy conversion cycle, which refers to the rate of change of the ambient temperature of the working area of ​​the photovoltaic cell during the energy conversion cycle. It reflects the performance of the photovoltaic component under different ambient temperatures. As the ambient temperature rises, the output power or output voltage of the photovoltaic component will decrease.

[0041] is the ambient temperature reference coefficient, which refers to the predefined standard value of the ambient temperature coefficient.

[0042] It is the impact factor corresponding to the unit value of sunshine duration predefined in the energy supply information database.

[0043] In a specific embodiment, a mapping set of sunshine duration and its corresponding influencing factors is constructed based on the relationship between historical sunshine duration and the electrical energy conversion evaluation value of the photovoltaic panel assembly, and the real-time sunshine duration is input into the mapping set to obtain the influencing factor corresponding to the unit value of the sunshine duration. At the same time, in this example, its value range is (0, 1).

[0044] It is the impact factor corresponding to the maximum power point current unit value predefined in the energy supply information library.

[0045] In a specific embodiment, a mapping set of the maximum power point current and its corresponding influencing factor is constructed based on the relationship between the historical maximum power point current and the electric energy conversion evaluation value of the photovoltaic panel assembly, and the real-time maximum power point current is input into the mapping set to obtain the influencing factor corresponding to the unit value of the maximum power point current. At the same time, its value range in this example is (0, 1).

[0046] is the correction factor corresponding to the ambient temperature coefficient predefined in the energy supply information library, and e is a natural constant.

[0047] In a specific embodiment, a mapping set of the ambient temperature coefficient and its corresponding correction factor is constructed based on the relationship between the historical ambient temperature coefficient and the electric energy conversion evaluation value of the photovoltaic panel assembly, and the real-time ambient temperature coefficient is input into the mapping set to obtain the correction factor corresponding to the ambient temperature coefficient. At the same time, its value range in this example is (0, 1).

[0048] To improve the electric energy conversion evaluation value of the photovoltaic panel assembly, it is necessary to consider the sunshine duration, ambient temperature and maximum power point current of the photovoltaic panel assembly in the working area. If the sunshine duration in the working area of ​​the photovoltaic panel assembly increases, the solar radiation energy received by the surface will also increase accordingly, resulting in an increase in the ambient temperature. Photovoltaic cells will produce more heat loss at high temperatures, thereby reducing the photoelectric conversion efficiency. Therefore, although the sunshine duration may be long, the power generation efficiency of the photovoltaic panel assembly may be suppressed due to the influence of high temperature. When the ambient temperature is relatively low, the energy capture rate of electrons and holes in the photovoltaic cell decreases, the photogenerated carrier recombination rate and the photovoltaic cell extraction rate decrease, resulting in a significant decrease in the photoelectric conversion efficiency. Therefore, if the sunshine duration in the working area of ​​the photovoltaic panel assembly increases, necessary measures need to be taken to keep the ambient temperature within a reasonable range to increase the electric energy conversion evaluation value of the photovoltaic panel assembly; at the same time, there is a positive correlation between the maximum power point current and the sunshine duration. When the sunshine duration increases, the solar radiation intensity remains stable or increases, then the output current of the photovoltaic cell will also increase accordingly. This is because more photons can excite electrons in the photovoltaic material, thereby generating more current.

[0049] Furthermore, the matching obtains the defined amount of electric energy storage of the photovoltaic panel assembly, and the specific matching process is as follows:

[0050] The electric energy conversion evaluation value of the photovoltaic panel assembly is matched with the electric energy storage limit amount corresponding to each electric energy conversion evaluation value interval predefined in the energy supply information library. The specific matching process is: obtain the mapping set of the electric energy conversion evaluation value of the photovoltaic panel assembly and the electric energy storage limit amount from the energy supply information library, first determine the interval to which the electric energy conversion evaluation value of the photovoltaic panel assembly belongs, and assign the electric energy storage limit amount corresponding to the interval to the photovoltaic panel assembly corresponding to the electric energy conversion evaluation value, so as to obtain the electric energy storage limit amount of the photovoltaic panel assembly through matching.

[0051] It should be explained that the above-mentioned energy storage limit of the photovoltaic panel assembly represents the minimum amount of electrical energy that the photovoltaic panel assembly can store. The energy storage limit of the photovoltaic panel assembly is usually related to the thermal capacity of the heat storage material, the volume or mass of the heat storage system, and the range of temperature change. This embodiment does not make any special restrictions on this.

[0052] Determination of thermal energy conversion evaluation value: Monitor the energy conversion process of the collector, obtain the thermal energy conversion data of the collector, determine the thermal energy conversion evaluation value of the collector, and match it to obtain the thermal energy storage limit of the collector, and record it as the first energy storage limit of the solar tower. At the same time, the storage type corresponding to the thermal energy storage limit of the collector is recorded as the first energy storage type of the solar tower.

[0053] The thermal energy conversion data of the above-mentioned collector specifically includes the length and width of the collector's heliostat, the solar radiation intensity value of the collector at each energy conversion time point, and the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle.

[0054] The above-mentioned photovoltaic-thermal integrated solar tower is a power supply solar tower that generates thermal energy by utilizing solar thermal conversion and generates electrical energy by utilizing solar photovoltaic conversion. The solar tower in the embodiment of the present invention mainly includes two parts: a collector and a photovoltaic panel assembly. The photovoltaic-thermal integrated solar tower can simultaneously utilize the light energy and thermal energy resources of solar energy, thereby improving the overall power generation efficiency. In addition, the components of the solar tower power supply system are relatively few and the interaction relationship between them is simple and clear, so it has higher reliability.

[0055] The heliostats on the collector assembly are responsible for focusing sunlight onto the collector. When the sun shines on the heliostats on the collector, each mirror tracks the sun's position, ensuring that the light is always focused on the collector. The collector absorbs this focused light and converts it into heat energy, which in turn drives the steam turbine to generate electricity. To further optimize energy utilization efficiency and meet the needs of large-scale deployment, the solar tower energy supply system combines the advantages of tower and trough mirror field technologies, implementing a stepped heating strategy based on their respective operating temperature ranges. In this design, the trough mirror field is generally responsible for initial preheating or low-temperature heating, while the tower mirror field focuses on further heating in the higher temperature range, thus achieving cascaded energy utilization and maximized conversion.

[0056] Photovoltaic panel components can directly convert sunlight into electrical energy. When sunlight shines on the surface of the photovoltaic panel components, a portion of the photons are absorbed by the silicon material, and the energy of the photons is transferred to the silicon atoms, so that the electrons on the silicon atoms obtain enough energy to jump from the low energy level to the high energy level and become free electrons, thereby forming a potential difference. When the external circuit is connected, an electric current is formed to provide power support for the power grid. The photovoltaic power generation process is simple and does not consume resources. The use of solar energy, a renewable energy source, reduces dependence on fossil fuels.

[0057] It should be explained that the outer wall of the solar tower in the embodiment of the present invention also has a cleaning device, in which the rotating cleaning gear drives the cleaning block to slide on the inner wall of the cleaning shell through the gear ring, and the brush on the inner wall of the cleaning block cleans the outer wall of the tower body, making it more convenient to clean the outer wall of the tower body, facilitating the maintenance of the tower body, and more convenient for the technical research and development and implementation of electricity.

[0058] Specifically, the determination of the heat energy conversion evaluation value of the collector is carried out in the following process:

[0059] The length and width of the heliostat are extracted from the thermal energy conversion data of the collector, and the heat collecting surface area of ​​the heliostat is obtained through the area formula: area = length * width.

[0060] The length and width of the above-mentioned collector heliostat can be obtained from the instruction manual of the collector heliostat.

[0061] According to the thermal energy conversion data of the collector, the energy conversion time points of the collector are extracted, the solar radiation intensity value of the collector at each energy conversion time point is obtained, and the average value of the solar radiation intensity of the collector during the energy conversion cycle is obtained by average processing.

[0062] The above energy conversion time points are obtained by dividing the energy conversion cycle into various energy conversion time points. The determination of the energy conversion cycle is obtained by energy supply supervision personnel through comprehensive analysis based on factors such as the collector status, usage environment, and actual conversion needs.

[0063] The above solar radiation intensity values ​​can be measured by a solar radiometer.

[0064] The ambient temperature curve of the working area of ​​the collector during the energy conversion cycle is obtained from the thermal energy conversion data of the collector, and a curve offset comparison is performed with the suitable ambient temperature curve of the working area of ​​the collector during the energy conversion cycle predefined in the energy supply information database. The ambient temperature deviation values ​​of the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle on the vertical axis are counted and accumulated to obtain the total ambient temperature deviation value of the working area of ​​the collector during the energy conversion cycle.

[0065] The above-mentioned ambient temperature can be obtained by the temperature sensor in the working area of ​​the collector at each energy conversion time point, and the ambient temperature curve can be constructed based on the obtained ambient temperature, such as Figure 3 As shown, the horizontal axis of the ambient temperature curve is the energy conversion time point, the unit is minutes, and the vertical axis is the ambient temperature, the unit is degrees Celsius.

[0066] The data stored in the above-mentioned energy supply information database is obtained by fitting based on the statistical working data of the solar tower energy supply system for multiple times. For example, the environmental suitable temperature curve is obtained by obtaining multiple ambient temperatures and the energy supply supervisor determines that the solar tower meets the ambient temperature for optimal energy supply efficiency at different ambient temperatures. The curve is fitted as the environmental suitable temperature curve, and the values ​​in the energy supply information database are obtained in this way. The values ​​may change due to different working environments, actual energy supply needs, and the status of the solar tower equipment. This embodiment does not make any special restrictions on this.

[0067] The above-mentioned ambient temperature curve 1 is compared with the ambient temperature curve 2 by curve offset, such as Figure 3As shown, the horizontal axis of the ambient temperature curve offset comparison diagram is the energy conversion time point, the unit is minute, and the vertical axis is the ambient temperature, the unit is Celsius.

[0068] According to the above Figure 3 The comparison chart of the ambient temperature curve offset shows that the ambient temperature of the working area of ​​the collector during the energy conversion cycle is affected by factors such as weather conditions, geographical location, topography, and there are many differences between the ambient temperature of the working area of ​​the collector during the energy conversion cycle and the suitable ambient temperature curve of the working area of ​​the collector during the energy conversion cycle. Therefore, the offset between the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle and the suitable ambient temperature curve of the working area of ​​the collector during the energy conversion cycle is obvious, which may cause the collector to fail to work under the optimal temperature conditions, thereby causing the energy conversion evaluation value to decrease.

[0069] Comprehensive analysis is performed to obtain the thermal energy conversion evaluation value of the collector.

[0070] Furthermore, in this embodiment, the thermal energy conversion evaluation value of the collector is obtained by comprehensively analyzing the heat collecting surface area of ​​the heliostat of the collector, the average solar radiation intensity of the collector during the energy conversion cycle, and the total deviation value of the ambient temperature of the working area to which the collector belongs during the energy conversion cycle. This is used to determine the thermal energy conversion evaluation value of the collector. In this embodiment, a more accurate calculation method is used to obtain the value. The specific expression is:

[0071] ;

[0072] In the formula is the thermal energy conversion evaluation value of the collector, which in this embodiment measures the ability of the collector to convert solar radiation energy into thermal energy.

[0073] The heat-collecting surface area of ​​the heliostat of the collector refers to the surface area of ​​the heliostat that can be used to reflect sunlight. The larger this area is, the more sunlight can be captured and reflected in theory, thereby improving the thermal energy conversion evaluation value of the collector.

[0074] It is the average solar radiation intensity of the collector during the energy conversion cycle, which refers to the average intensity of solar radiation energy received per unit area on the surface of the collector heliostat during the energy conversion cycle.

[0075] It is the total deviation value of the ambient temperature of the working area of ​​the collector during the energy conversion cycle, which refers to the total difference between the ambient temperature of the working area of ​​the collector and the suitable ambient temperature during the energy conversion cycle.

[0076] It is the impact factor corresponding to the unit value of the heat collection surface area predefined in the energy supply information library.

[0077] In a specific embodiment, a mapping set of the heat collection surface area and its corresponding influencing factors is constructed based on the relationship between the historical heat collection surface area and the thermal energy conversion evaluation value of the collector, and the real-time heat collection surface area is input into the mapping set to obtain the influencing factor corresponding to the unit value of the heat collection surface area. At the same time, its value range in this example is (0, 1).

[0078] It is the impact factor corresponding to the unit value of solar radiation intensity predefined in the energy supply information database.

[0079] In a specific embodiment, a mapping set of solar radiation intensity and its corresponding influencing factors is constructed based on the relationship between the historical solar radiation intensity and the thermal energy conversion evaluation value of the collector, and the real-time solar radiation intensity is input into the mapping set to obtain the influencing factor corresponding to the unit value of the solar radiation intensity. At the same time, in this example, its value range is (0, 1).

[0080] is the impact factor corresponding to the unit value of the total ambient temperature deviation value predefined in the energy supply information library, and e is a natural constant.

[0081] In a specific embodiment, a mapping set of the total ambient temperature deviation value and its corresponding influencing factor is constructed based on the relationship between the historical total ambient temperature deviation value and the thermal energy conversion evaluation value of the collector, and the real-time total ambient temperature deviation value is input into the mapping set to obtain the influencing factor corresponding to the unit value of the total ambient temperature deviation value. At the same time, its value range in this example is (0, 1).

[0082] If you want to improve the thermal energy conversion evaluation value of the collector, you need to consider the collector's heat collection surface area, the solar radiation intensity value that can be absorbed, and the ambient temperature deviation value of the working area. If the collector heliostat has a larger heat collection surface area, it means that the collector heliostat can use a larger surface area for reflecting sunlight, which can ensure that as much sunlight as possible is reflected and focused on the collector, so that the collector can absorb more solar radiation energy, thereby increasing the average solar radiation intensity of the collector during the energy conversion cycle; if the ambient temperature of the working area of ​​the collector is higher and is higher than the ambient temperature suitable for the environment Temperature, the total deviation value of the ambient temperature is large, the temperature difference between the collector and the surrounding environment is reduced, resulting in increased heat loss of the collector, thereby affecting the thermal efficiency of the collector. If the ambient temperature of the working area of ​​the collector is low and lower than the suitable ambient temperature, the temperature difference between the collector and the surrounding environment increases. Although this is beneficial to heat collection to a certain extent, too low a temperature may cause the thermal conductivity of the internal material of the collector to decrease, thereby affecting the heat transfer efficiency. Under extreme low temperature conditions, the working fluid inside the collector cannot start or operate normally due to the low temperature, thereby reducing the thermal energy conversion evaluation value of the collector.

[0083] Specifically, the matching process is as follows:

[0084] The thermal energy conversion evaluation value of the collector is matched with the thermal energy storage limit amount corresponding to each thermal energy conversion evaluation value interval predefined in the energy supply information library. The specific matching process is: obtain the mapping set of the thermal energy conversion evaluation value of the collector and the thermal energy storage limit amount from the energy supply information library, determine the interval to which the thermal energy conversion evaluation value of the collector belongs, and assign the thermal energy storage limit amount corresponding to the interval to the collector corresponding to the thermal energy conversion evaluation value, so as to obtain the thermal energy storage limit amount of the collector through matching.

[0085] It should be explained that the thermal energy storage limit of the above-mentioned collector represents the minimum amount of thermal energy that the collector can store. The thermal energy storage limit of the collector is usually related to the thermal capacity of the heat storage material, the volume or mass of the heat storage system, and the range of temperature change. This embodiment does not make any special restrictions on this.

[0086] The heat conduction in the collector uses solid particles as the heat transfer and heat storage medium. The heat transfer process basically follows the law of thermal radiation. The solid particles are fly ash or cement powder that is easy to fluidize, which can effectively cope with the impact of temperature transients and avoid the risk of solidification and gasification of the molten salt medium.

[0087] Energy supply status feedback: Obtain the energy demand data set of the energy supply area, match the energy demand type and energy demand limit of the energy supply area, compare them with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower, and finally provide feedback on the energy supply status of the solar tower.

[0088] Specifically, the energy demand type of the energy supply area and the energy demand limit of the energy supply area are matched, and the specific matching process is:

[0089] According to the energy demand data set of the energy supply area, the energy demand types corresponding to the predefined energy demand data sets in the energy supply information library are matched. The specific matching process is: obtain the mapping set of the energy demand data set and the energy demand type of the energy supply area from the energy supply information library, determine the category of the energy demand data set of the energy supply area, and assign the energy demand type corresponding to the category to the energy supply area corresponding to the energy demand data set, so as to match the energy demand type of the energy supply area.

[0090] According to the energy demand data set of the energy supply area, the energy demand definition amount corresponding to each predefined energy demand data set is matched to obtain the energy demand definition amount of the energy supply area.

[0091] In a specific embodiment, if the energy demand data set of the energy-demanding area includes heating and hot water consumption, the energy demand type of the energy-demanding area can be obtained from the heating and hot water consumption as the first energy storage type of the solar tower, and the energy demand limit is 434.7 watts per square meter.

[0092] Furthermore, the energy supply status of the solar tower is fed back, and the specific feedback process is as follows:

[0093] The first energy storage type of the solar tower and the second energy storage type of the solar tower are collectively referred to as energy storage types of the solar tower.

[0094] The energy demand type of the energy-demanding area is compared with the energy storage type of the solar tower. If the energy demand type of the energy-demanding area is the first energy storage type of the solar tower, the difference between the first energy storage limit of the solar tower and the energy demand limit of the energy-demanding area is processed to obtain the remaining energy storage of the solar tower, thereby providing feedback on the energy supply status of the solar tower.

[0095] If the energy demand type of the energy supply area is the second energy storage type of the solar tower, the difference between the second energy storage limit of the solar tower and the energy demand limit of the energy supply area is processed to obtain the remaining energy storage of the solar tower, thereby providing feedback on the energy supply status of the solar tower.

[0096] If the energy demand type of the energy supply area includes the first energy storage type of the solar tower and the second energy storage type of the solar tower, the first energy storage limit amount and the second energy storage limit amount of the solar tower are respectively subtracted from the energy demand limit amount of the energy supply area, and the sum is summed to obtain the remaining energy storage amount of the solar tower, thereby providing feedback on the energy supply status of the solar tower.

[0097] The first energy storage limit is the thermal energy storage limit of the collector, which indicates the minimum amount of thermal energy that the collector can store; the second energy storage limit is the electrical energy storage limit of the photovoltaic panel assembly, which indicates the minimum amount of electrical energy that the photovoltaic panel assembly can store.

[0098] The above-mentioned feedback on the energy supply status of the solar tower is specifically carried out as follows: first determine the positive or negative situation based on the remaining energy storage of the solar tower. If the remaining energy storage of the solar tower is positive or zero, it means that the energy storage in the solar tower can meet the energy demand of the energy-demanding area, and the solar tower can normally provide energy supply services to the energy-demanding area, and the feedback is that the energy supply status of the solar tower is in good condition; if the remaining energy storage of the solar tower is negative, it means that the energy storage in the solar tower cannot meet the energy demand of the energy-demanding area, and the solar tower cannot normally provide energy supply services to the energy-demanding area, and the feedback is that the energy supply status of the solar tower is in poor condition.

[0099] Reference Figure 2 As shown, the second aspect of the present invention provides a system for a photovoltaic-thermal integrated solar tower energy supply method, including: a thermal energy conversion evaluation value determination module, an electric energy conversion evaluation value determination module and an energy supply status feedback module.

[0100] The second aspect of the present invention provides a system for a photovoltaic-thermal integrated solar tower energy supply method, which also includes: an energy supply information database, which is used to store initial setting values ​​such as the environmental suitable temperature curve, environmental temperature reference coefficient, and preset values ​​of various factors in the working area of ​​the collector during the energy conversion cycle.

[0101] The thermal energy conversion evaluation value determination module and the electric energy conversion evaluation value determination module are both connected to the energy supply status feedback module, and the thermal energy conversion evaluation value determination module and the electric energy conversion evaluation value determination module are both connected to the energy supply information library.

[0102] The thermal energy conversion evaluation value determination module is used to monitor the energy conversion process of the collector, obtain the thermal energy conversion data of the collector, and evaluate the thermal energy conversion evaluation value of the collector, thereby matching the thermal energy storage limit of the collector and recording it as the first energy storage limit of the solar tower. At the same time, the storage type corresponding to the thermal energy storage limit of the collector is recorded as the first energy storage type of the solar tower.

[0103] The electric energy conversion evaluation value determination module is used to monitor the energy conversion process of the photovoltaic panel assembly, obtain the electric energy conversion data of the photovoltaic panel assembly, and determine the electric energy conversion evaluation value of the photovoltaic panel assembly, thereby matching the electric energy storage limit amount of the photovoltaic panel assembly and recording it as the second energy storage limit amount of the solar tower. At the same time, the storage type corresponding to the electric energy storage limit amount of the photovoltaic panel assembly is recorded as the second energy storage type of the solar tower.

[0104] The energy supply status feedback module is used to obtain the energy demand data set of the energy supply area, match the energy demand type of the energy supply area and the energy demand limit of the energy supply area, compare them with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower, and finally provide feedback on the energy supply status of the solar tower.

[0105] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the scope of protection of the present invention.

Claims

1. A photovoltaic-thermal integrated solar tower energy supply method, characterized in that: include: Determination of thermal energy conversion evaluation value: Monitor the energy conversion process of the collector, obtain the thermal energy conversion data of the collector, determine the thermal energy conversion evaluation value of the collector, and match it to obtain the thermal energy storage limit of the collector, which is recorded as the first energy storage limit of the solar tower. At the same time, the storage type corresponding to the thermal energy storage limit of the collector is recorded as the first energy storage type of the solar tower; Determination of the electric energy conversion evaluation value: The energy conversion process of the photovoltaic panel assembly is monitored, the electric energy conversion data of the photovoltaic panel assembly is obtained, and the electric energy conversion evaluation value of the photovoltaic panel assembly is determined. The electric energy storage limit amount of the photovoltaic panel assembly is matched with the electric energy storage limit amount of the photovoltaic panel assembly, and recorded as the second energy storage limit amount of the solar tower. At the same time, the storage type corresponding to the electric energy storage limit amount of the photovoltaic panel assembly is recorded as the second energy storage type of the solar tower; Energy supply status feedback: Obtain the energy demand data set of the energy supply area, match the energy demand type and energy demand limit of the energy supply area, compare it with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower. Finally, feedback on the energy supply status of the solar tower is provided; The specific determination process of determining the thermal energy conversion evaluation value of the collector is as follows: The length and width of the heliostat are extracted from the heat energy conversion data of the collector, and the heat collecting surface area of ​​the heliostat is obtained by the area formula. According to the thermal energy conversion data of the collector, each energy conversion time point of the collector is extracted, the solar radiation intensity value of the collector at each energy conversion time point is obtained, and the average value of the solar radiation intensity of the collector during the energy conversion cycle is obtained by average processing; Obtaining the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle from the thermal energy conversion data of the collector, performing a curve offset comparison with the suitable ambient temperature curve of the working area of ​​the collector during the energy conversion cycle predefined in the energy supply information database, and statistically calculating and accumulating the ambient temperature deviation values ​​on the vertical axis of the ambient temperature curve of the working area of ​​the collector during the energy conversion cycle to obtain the total ambient temperature deviation value of the working area of ​​the collector during the energy conversion cycle; Comprehensive analysis yields the thermal energy conversion evaluation value of the collector; The heat energy conversion evaluation value of the collector is specifically expressed as follows: In the formula is the thermal energy conversion evaluation value of the collector, is the heat collecting surface area of ​​the heliostat of the collector, is the average solar radiation intensity of the collector during the energy conversion cycle, is the total deviation of the ambient temperature in the working area of ​​the collector during the energy conversion cycle. is the impact factor corresponding to the unit value of the heat collection surface area predefined in the energy supply information database, is the impact factor corresponding to the unit value of solar radiation intensity predefined in the energy supply information database, is the impact factor corresponding to the unit value of the total ambient temperature deviation value predefined in the energy supply information library, and e is a natural constant.

2. The photovoltaic-thermal integrated solar tower energy supply method according to claim 1, characterized in that: The matching process is as follows: The heat energy conversion evaluation value of the collector is matched with the heat energy storage limit amount corresponding to each predefined heat energy conversion evaluation value interval, so as to obtain the heat energy storage limit amount of the collector.

3. The photovoltaic-thermal integrated solar tower energy supply method according to claim 1, characterized in that: The specific determination process of determining the electric energy conversion evaluation value of the photovoltaic panel assembly is as follows: Based on the electrical energy conversion data of the photovoltaic panel assembly, the sunshine duration of each working area of ​​the photovoltaic panel assembly within the energy conversion cycle is extracted, and the average sunshine duration of the working area of ​​the photovoltaic panel assembly within the energy conversion cycle is obtained by averaging. Extracting the energy conversion time point corresponding to the maximum power of the photovoltaic panel assembly within the energy conversion cycle from the electrical energy conversion data of the photovoltaic panel assembly, thereby obtaining the output current of the photovoltaic panel assembly at the energy conversion time point from the electrical energy conversion data of the photovoltaic panel assembly, and recording it as the maximum power point current of the photovoltaic panel assembly within the energy conversion cycle; Based on the electric energy conversion data of the photovoltaic panel assembly, the average ambient temperature of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle is extracted, and the average ambient temperature of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle is multiplied by the influence factor corresponding to the predefined ambient temperature unit value in the energy supply information database to obtain the ambient temperature coefficient of the working area of ​​the photovoltaic panel assembly during the energy conversion cycle; The ambient temperature reference coefficient is extracted from the energy supply information database, and the electric energy conversion evaluation value of the photovoltaic panel component is obtained through comprehensive analysis.

4. The photovoltaic-thermal integrated solar tower energy supply method according to claim 3, characterized in that: The electric energy conversion evaluation value of the photovoltaic panel assembly is specifically expressed as: ； In the formula is the electrical energy conversion evaluation value of the photovoltaic panel component, is the average sunshine duration of the working area of ​​the photovoltaic panel component during the energy conversion cycle, is the maximum power point current of the photovoltaic panel component during the energy conversion cycle, It is the ambient temperature coefficient of the working area of ​​the photovoltaic panel component during the energy conversion cycle. is the ambient temperature reference coefficient, is the impact factor corresponding to the unit value of sunshine duration predefined in the energy supply information database, The impact factor corresponding to the maximum power point current unit value predefined in the energy supply information database, is the correction factor corresponding to the ambient temperature coefficient predefined in the energy supply information library, and e is a natural constant.

5. The photovoltaic-thermal integrated solar tower energy supply method according to claim 1, characterized in that: The matching process is as follows: The electric energy conversion evaluation value of the photovoltaic panel assembly is matched with the electric energy storage limit amount corresponding to each predefined electric energy conversion evaluation value interval, so as to obtain the electric energy storage limit amount of the photovoltaic panel assembly.

6. The photovoltaic-thermal integrated solar tower energy supply method according to claim 1, characterized in that: The energy demand type and the defined amount of energy demand of the energy supply area are matched, and the specific matching process is as follows: According to the energy demand data set of the energy supply area, the energy demand type corresponding to each predefined energy demand data set is matched to obtain the energy demand type of the energy supply area; According to the energy demand data set of the energy supply area, the energy demand definition amount corresponding to each predefined energy demand data set is matched to obtain the energy demand definition amount of the energy supply area.

7. The photovoltaic-thermal integrated solar tower energy supply method according to claim 1, characterized in that: The specific feedback process of the energy supply status of the solar tower is as follows: The first energy storage type of the solar tower and the second energy storage type of the solar tower are collectively referred to as energy storage types of the solar tower; Comparing the energy demand type of the energy supply area with the energy storage type of the solar tower; if the energy demand type of the energy supply area is the first energy storage type of the solar tower, performing a difference process between the first energy storage limit of the solar tower and the energy demand limit of the energy supply area to obtain the remaining energy storage of the solar tower, thereby providing feedback on the energy supply status of the solar tower; If the energy demand type of the energy supply area is the second energy storage type of the solar tower, the difference between the second energy storage limit of the solar tower and the energy demand limit of the energy supply area is processed to obtain the remaining energy storage of the solar tower, thereby providing feedback on the energy supply status of the solar tower; If the energy demand type of the energy supply area includes the first energy storage type of the solar tower and the second energy storage type of the solar tower, the first energy storage limit amount and the second energy storage limit amount of the solar tower are respectively subtracted from the energy demand limit amount of the energy supply area, and the sum is summed to obtain the remaining energy storage amount of the solar tower, thereby providing feedback on the energy supply status of the solar tower.

8. A system using the photovoltaic-thermal integrated solar tower energy supply method according to any one of claims 1 to 7, characterized in that: include: a heat energy conversion evaluation value determination module, configured to monitor the energy conversion process of the collector, obtain heat energy conversion data of the collector, determine the heat energy conversion evaluation value of the collector, thereby matching the heat energy storage limit of the collector and recording it as the first energy storage limit of the solar tower; and simultaneously recording the storage type corresponding to the heat energy storage limit of the collector as the first energy storage type of the solar tower; an electric energy conversion evaluation value determination module, configured to monitor the energy conversion process of the photovoltaic panel assembly, obtain electric energy conversion data of the photovoltaic panel assembly, determine the electric energy conversion evaluation value of the photovoltaic panel assembly, thereby matching the electric energy storage limit of the photovoltaic panel assembly and recording it as the second energy storage limit of the solar tower; and simultaneously recording the storage type corresponding to the electric energy storage limit of the photovoltaic panel assembly as the second energy storage type of the solar tower; The energy supply status feedback module is used to obtain the energy demand data set of the energy supply area, match the energy demand type and energy demand limit of the energy supply area, compare them with the energy storage limit of the solar tower, and determine the remaining energy storage of the solar tower, and finally provide feedback on the energy supply status of the solar tower.

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