Estimation method and device for downward long wave radiation in photovoltaic power station

Abstract

The invention provides a method and a device for estimating downward long wave radiation in a photovoltaic power station, and relates to the field of photovoltaic technology. The method comprises the following steps: acquiring downward long wave radiation quantity corresponding to a natural earth surface at a preset distance from a photovoltaic power station; determining a time sequence adjustment coefficient, and estimating a radiation increment coefficient based on time sequence segmentation according to the time sequence adjustment coefficient; the radiation increment coefficient indicates the corresponding radiation increment condition of downward long wave radiation of the ground surface in the photovoltaic power station compared with the natural ground surface; and according to the downward long-wave radiation quantity and the radiation increment coefficient corresponding to the natural earth surface, estimating the downward long-wave radiation quantity corresponding to each time sequence of the earth surface of the photovoltaic power station. Based on the technical scheme, the downward long wave radiation quantity of a specific radiation mechanism in the photovoltaic power station can be accurately estimated.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaic technology, and in particular to a method and device for estimating downward long-wave radiation in a photovoltaic power station. Background Art

[0002] In order to cope with global climate change, the development and utilization of solar energy, as the most abundant renewable energy, has become the key. By the end of 2023, the global cumulative installed capacity of photovoltaic power generation will reach 420GW (gigawatts). my country's solar energy resources are concentrated in ecologically fragile areas such as the western arid and semi-arid areas and the Qinghai-Tibet Plateau. The impact of large-scale photovoltaic power station construction on the local ecology urgently needs scientific evaluation.

[0003] In the existing technology, the research on the ecological and environmental effects of photovoltaic power stations mainly focuses on phenomena such as surface shading, cooling, and reduced surface wind speed during the day, and there are mature parameterized models to support quantitative analysis. However, there is no effective quantitative method for the process in which photovoltaic power stations block the heat dissipation of long-wave radiation from the surface at night and slow down the heat exchange between the surface and the atmosphere. This effect has potential positive significance for the growth of vegetation in alpine areas, but because it involves a complex process of multiple reflections of thermal radiation, traditional physical models are difficult to analyze, resulting in a long-term lack of high-temporal-resolution computational models for the phenomenon of increased long-wave radiation at night.

[0004] At present, although the land surface process model based on numerical model can partially reflect the surface energy exchange, it is insufficient to describe the specific radiation mechanism within the photovoltaic power station. Constructing a radiation estimation model that is adapted to the long-wave thermal insulation characteristics of the photovoltaic power station at night has become a technical problem that needs to be solved urgently.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] To overcome the problems existing in the related art, the embodiments of the present disclosure provide a method and device for estimating downward longwave radiation in a photovoltaic power station, which can accurately estimate the amount of downward longwave radiation under a specific radiation mechanism in a photovoltaic power station.

[0007] According to a first aspect of an embodiment of the present disclosure, a method for estimating downward longwave radiation in a photovoltaic power station is provided, the method comprising: obtaining the amount of downward longwave radiation corresponding to a natural surface at a preset distance from the photovoltaic power station; determining a timing adjustment coefficient, and estimating a radiation increment coefficient based on timing segments according to the timing adjustment coefficient; the radiation increment coefficient indicates the radiation increment of the downward longwave radiation corresponding to the surface in the photovoltaic power station compared to the natural surface; based on the downward longwave radiation corresponding to the natural surface and the radiation increment coefficient, estimating the amount of downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station.

[0008] Optionally, determine the total number of daily time series corresponding to the target time resolution; determine the time series adjustment coefficient based on the total number of daily time series corresponding to the target time resolution and the total number of daily time series corresponding to the half-hourly resolution; wherein the target time resolution is the time resolution of the downward longwave radiation corresponding to the acquired natural surface.

[0009] Optionally, the surface air temperature and water vapor pressure of a natural surface corresponding to a natural surface at a preset distance from the photovoltaic power station are collected at a target time resolution; and the downward longwave radiation corresponding to the natural surface is estimated based on the surface air temperature and water vapor pressure of the natural surface at the target time resolution.

[0010] Optionally, after obtaining the downward longwave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station, the method also includes: if the original data time is standard time, determining the time offset value according to the standard time and the local time corresponding to the photovoltaic power station; moving the time of the original data as a whole by the time offset value to obtain the local time data; wherein the original data is the obtained downward longwave radiation corresponding to the natural surface, or the collected surface air temperature and water vapor pressure of the natural surface.

[0011] Optionally, after the time of the original data is moved as a whole by the time offset value, the method also includes: when the original data is collected at the target time resolution, according to the time zone where the photovoltaic power station is located, determining the target data of the daily time series to be reorganized in the daily collected data; if the time zone of the photovoltaic power station is in the eastern zone of the standard time, then the daily target data is moved to the end of the previous day, or, if the time zone of the photovoltaic power station is in the western zone of the standard time, then the daily target data is moved to the beginning of the next day, to form a daily continuous time series sequence, so as to obtain the daily target time resolution downward longwave radiation of the natural surface at a preset distance from the photovoltaic power station.

[0012] Optionally, according to the first preset formula and the timing adjustment coefficient, the downward long-wave radiation corresponding to the surface of the photovoltaic power station is calculated based on the timing segmentation, and the radiation increment coefficient of the target time resolution compared with the corresponding downward long-wave radiation of the natural surface; the first preset formula includes: ;in, represents the incremental factor of the downward longwave radiation of the target time resolution, i represents the timing of acquiring data at the target time resolution, N The target time resolution is relative to the half-hourly resolution. , n represents the total number of daily time series corresponding to the target time resolution, and 48 represents the total number of time series at the target time resolution.

[0013] Optionally, based on a second preset formula, the downward longwave radiation corresponding to each time series of the natural surface every day and the radiation increment coefficient, the downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station every day is calculated; the second preset formula includes: ;in, It indicates the downward long-wave radiation corresponding to each time series of the photovoltaic power station surface every day. It represents the downward longwave radiation corresponding to each time series of the natural surface every day. represents the annual average downward longwave radiation from the natural surface, , a and b are constants, express The collection frequency.

[0014] According to a second aspect of an embodiment of the present disclosure, a device for estimating downward long-wave radiation in a photovoltaic power station is provided, and the device for estimating downward long-wave radiation in the photovoltaic power station comprises: an acquisition module, an incremental coefficient estimation module and a radiation quantity estimation module; the acquisition module is used to acquire the downward long-wave radiation corresponding to a natural surface at a preset distance from the photovoltaic power station; the incremental coefficient estimation module is used to determine a timing adjustment coefficient, and estimate the radiation incremental coefficient based on the timing segmentation according to the timing adjustment coefficient; the radiation incremental coefficient indicates the radiation increment of the downward long-wave radiation corresponding to the surface in the photovoltaic power station compared to the natural surface; the radiation quantity estimation module is used to estimate the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station and the radiation incremental coefficient.

[0015] Optionally, the incremental coefficient estimation module is specifically used to: determine the total number of daily time series corresponding to the target time resolution; determine the time series adjustment coefficient based on the total number of daily time series corresponding to the target time resolution and the total number of daily time series corresponding to the half-hourly resolution; wherein the target time resolution is the time resolution of the downward longwave radiation corresponding to the acquired natural surface.

[0016] Optionally, the acquisition module is specifically used to: collect the surface air temperature and water vapor pressure of the natural surface at the target time resolution; and estimate the downward longwave radiation of the natural surface at the target time resolution corresponding to the target time resolution based on the surface air temperature and water vapor pressure of the natural surface at the target time resolution.

[0017] Optionally, the estimation device for the downward long-wave radiation in the photovoltaic power station also includes: a time conversion module; a time conversion module, which is used to obtain the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station, and if the original data time is the standard time, determine the time offset value according to the standard time and the local time corresponding to the photovoltaic power station; move the time of the original data as a whole by the time offset value to obtain the local time data; wherein the original data is the obtained downward long-wave radiation corresponding to the natural surface, or the collected surface air temperature and water vapor pressure of the natural surface.

[0018] Optionally, the estimation device for the downward long-wave radiation in the photovoltaic power station also includes: a time series reorganization module; a time series reorganization module, which is used to move the time of the original data as a whole by the time offset value, and when the original data is collected at the target time resolution, determine the target data of the daily time series to be reorganized in the daily collected data according to the time zone where the photovoltaic power station is located; if the time zone of the photovoltaic power station is in the eastern zone of the standard time, the daily target data is moved to the end of the previous day, or, if the time zone of the photovoltaic power station is in the western zone of the standard time, the daily target data is moved to the beginning of the next day, to form a daily continuous time series sequence, so as to obtain the daily target time resolution downward long-wave radiation amount of the natural surface at a preset distance from the photovoltaic power station.

[0019] Optionally, the increment estimation module is specifically used to: calculate the downward long-wave radiation corresponding to the surface of the photovoltaic power station based on the time segmentation, compared with the radiation increment coefficient of the target time resolution of the corresponding downward long-wave radiation of the natural surface according to the first preset formula and the timing adjustment coefficient; the first preset formula includes: ;in, represents the incremental factor of the downward longwave radiation of the target time resolution, i represents the timing of acquiring data at the target time resolution, N The target time resolution is relative to the half-hourly resolution. , n Indicates the total number of daily time series corresponding to the target time resolution.

[0020] Optionally, the radiation estimation module is specifically used to calculate the downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station every day based on the second preset formula, the downward longwave radiation corresponding to the natural surface every day and the radiation increment coefficient; the second preset formula includes: ;in, It indicates the downward long-wave radiation corresponding to each time series of the photovoltaic power station surface every day. It represents the downward longwave radiation corresponding to each time series of the natural surface every day. represents the annual average downward longwave radiation from the natural surface, , a and b are constants, express The collection frequency.

[0021] According to a third aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for estimating downward longwave radiation in a photovoltaic power station as described in the first aspect is implemented.

[0022] According to a fourth aspect of an embodiment of the present disclosure, a computer device, a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor are provided, wherein the computer-readable instructions, when executed by the processor, implement the method for estimating downward long-wave radiation in a photovoltaic power station as described in the first aspect.

[0023] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects: In the disclosed embodiment, the downward long-wave radiation of the natural surface at a preset distance from the photovoltaic power station is obtained; and the timing adjustment coefficient is determined, and the radiation increment coefficient of the downward long-wave radiation corresponding to the surface of the photovoltaic power station compared to the natural surface is estimated based on the timing segmentation according to the timing adjustment coefficient; the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station is estimated according to the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station and the radiation increment coefficient. This scheme provides an estimation model for estimating the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station, which can generate the downward long-wave radiation increment coefficient corresponding to the surface, and use the downward long-wave radiation corresponding to the natural surface outside the photovoltaic power station as the reference radiation of the natural surface in the photovoltaic power station without photovoltaic panels. Based on the reference radiation and the increment coefficient, the downward long-wave radiation in each time period in the photovoltaic power station can be accurately estimated, thereby providing a data basis for quantitative evaluation of the nighttime insulation phenomenon.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] Figure 1 A schematic diagram of a system architecture for estimating downward longwave radiation in a photovoltaic power station provided in an embodiment of the present disclosure.

[0027] Figure 2 A schematic flow chart of a method for estimating downward longwave radiation in a photovoltaic power station provided in an embodiment of the present disclosure.

[0028] Figure 3 A logical processing diagram for estimating downward longwave radiation provided in an embodiment of the present disclosure.

[0029] Figure 4 A single-day comparison schematic diagram of hourly downward longwave radiation provided in an embodiment of the present disclosure.

[0030] Figure 5 A schematic diagram of a year-round comparison of daily downward longwave radiation provided in an embodiment of the present disclosure.

[0031] Figure 6 A hardware structure diagram of a computer device in which a method for estimating downward longwave radiation in a photovoltaic power station is located provided in an embodiment of the present disclosure.

[0032] Figure 7 A schematic diagram of the structure of a device for estimating downward longwave radiation in a photovoltaic power station provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0034] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0036] Next, the embodiments of the present disclosure are described in detail.

[0037] Figure 1 A schematic diagram of a system architecture for estimating downward long-wave radiation in a photovoltaic power station provided by an embodiment of the present disclosure. Figure 1 As shown, the system architecture 100 may include one or more of terminal devices such as a smart phone 101, a portable computer 102, a desktop computer 103, a network 104, and a server 105. The network 104 is used to provide a medium for a communication link between the terminal device and the server 105. The network 104 may include various connection types, such as wired, wireless communication links, or optical fiber cables, etc.

[0038] The terminal device may be any electronic device with data processing function, which has a display screen for displaying the long-wave radiation estimation results in various time periods in a day or a year to the user. The electronic device includes but is not limited to the above-mentioned desktop computers, portable computers, smart phones, tablet computers, etc.

[0039] It should be understood that Figure 1 The number of terminal devices, networks and servers in the embodiment is only for illustration. Any number of terminal devices, networks and servers may be provided according to the implementation requirements.

[0040] The method provided in the embodiment of the present invention can be executed by a terminal device, and accordingly, the device can be set in the terminal device. However, it is easy for a person skilled in the art to understand that the method for estimating downward long-wave radiation in a photovoltaic power station provided in the embodiment of the present invention can also be executed by a server, and accordingly, the device can also be set in a server, which is not particularly limited in this exemplary embodiment.

[0041] Figure 2 A method for estimating downward long-wave radiation in a photovoltaic power station is provided in an embodiment of the present disclosure, such as Figure 2 As shown in , the method includes the following S201 to S203: S201, obtaining downward long-wave radiation corresponding to a natural surface at a preset distance from a photovoltaic power station.

[0042] In the disclosed embodiment, a photovoltaic panel matrix is ​​usually provided in a photovoltaic power station, and the photovoltaic panels shield the ground surface, thereby affecting the amount of downward long-wave radiation from the ground surface.

[0043] Usually, large-area photovoltaic panels block the long-wave radiation emitted by the surface to the atmosphere, causing it to be repeatedly refracted between the surface and the photovoltaic panels, thereby significantly slowing down the cooling rate of the surface and the atmosphere. Therefore, it is slower than the natural surface cooling without the blocking of photovoltaic panels, resulting in the night-time heat preservation phenomenon.

[0044] Typically, downward longwave radiation refers to the longwave (infrared) radiation emitted by the Earth's atmosphere toward the Earth's surface.

[0045] Optionally, in an embodiment of the present disclosure, the downward longwave radiation corresponding to the natural surface outside the photovoltaic power station can be directly obtained; if it cannot be directly obtained, it can also be estimated based on the monitored surface air temperature and water vapor pressure of the natural surface outside the photovoltaic power station, and the embodiment of the present disclosure does not specifically limit this.

[0046] It should be noted that in the embodiment of the present disclosure, the preset distance is used to indicate an area that is relatively close to the photovoltaic power station, and the specific value of the preset distance can be selected based on experience. The embodiment of the present disclosure does not specifically limit the specific value of the preset distance.

[0047] S202: Determine a timing adjustment coefficient, and estimate a radiation increment coefficient based on the timing segmentation according to the timing adjustment coefficient.

[0048] Among them, the radiation increment coefficient indicates the radiation increment of the downward long-wave radiation corresponding to the surface in the photovoltaic power station compared with the natural surface.

[0049] It can be understood that the surface in a photovoltaic power station includes the surface on which photovoltaic modules are arranged.

[0050] It should be noted that in the embodiment of the present disclosure, the increase in downward longwave radiation in the photovoltaic power station compared to the natural surface is estimated in different time periods according to the time series. The degree of downward longwave radiation is different in different time periods, and the corresponding increase in downward longwave radiation of the photovoltaic power station surface compared to the natural surface is also different. This can obtain a more accurate expression of the actual situation of the increase in downward longwave radiation in the photovoltaic power station compared to the natural surface.

[0051] It should be noted that there is no particular order in which the above S201 and S202 are executed, and the embodiments of the present disclosure do not specifically limit this.

[0052] S203, estimating the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient.

[0053] It can be understood that by calculating the radiation increment in segments and obtaining the downward longwave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station, the downward longwave radiation corresponding to different time periods on the surface of the photovoltaic power station can be more accurately estimated.

[0054] The disclosed embodiment provides a method for estimating downward long-wave radiation in a photovoltaic power station, which obtains the downward long-wave radiation of a natural surface at a preset distance from the photovoltaic power station; and determines a timing adjustment coefficient, and estimates the radiation increment coefficient of the downward long-wave radiation corresponding to the surface of the photovoltaic power station compared to the natural surface based on the timing segmentation according to the timing adjustment coefficient; and estimates the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station and the radiation increment coefficient. The scheme provides an estimation model for estimating the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station, which can generate the downward long-wave radiation increment coefficient corresponding to the surface, and use the downward long-wave radiation corresponding to the natural surface outside the photovoltaic power station as the reference radiation of the natural surface in the photovoltaic power station without photovoltaic panels. Based on the reference radiation and the increment coefficient, the downward long-wave radiation in each time period in the photovoltaic power station can be accurately estimated, thereby providing a data basis for quantitative evaluation of the nighttime heat preservation phenomenon.

[0055] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by an embodiment of the present disclosure, when the downward longwave radiation corresponding to the natural surface of the photovoltaic power station cannot be directly obtained, the above S201 can be specifically performed by the following S201a and S201b: S201a, collecting the surface air temperature and water vapor pressure of the natural surface of the photovoltaic power station at a target time resolution.

[0056] Among them, the target time resolution is the data collection interval length.

[0057] Exemplarily, data is collected once every 1 hour, 0.5 hour or 15 minutes.

[0058] Optionally, the specific value of the target time resolution may be selected according to accuracy requirements, and the embodiments of the present disclosure do not specifically limit this.

[0059] It can be understood that both the surface air temperature and the water vapor pressure are conventional meteorological elements. Among them, the surface air temperature can be obtained from the public download channel of meteorological data; in the embodiment of the present disclosure, the hourly air temperature at a height of 2 meters observed on-site by the meteorological monitoring platform can be used. Compared with the air temperature, the water vapor pressure has less observation data. If there is a lack of monitoring data on the water vapor pressure corresponding to the hourly air temperature, the water vapor pressure can be determined by using the mixing ratio and air pressure through a general formula, or by using the dew point temperature and saturated water vapor pressure through a general formula. The embodiment of the present disclosure does not specifically limit this.

[0060] S201b. Estimate the downward longwave radiation at the target time resolution corresponding to the natural surface at a preset distance from the photovoltaic power station based on the surface air temperature and water vapor pressure of the natural surface at the target time resolution.

[0061] It can be understood that the downward longwave radiation is different in different time periods. In the embodiment of the present disclosure, the downward longwave radiation corresponding to the natural surface in each time period can be more accurately estimated by collecting monitoring data with a target time resolution.

[0062] For example, the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station can be estimated based on the following formula (1).

[0063] Formula (1) in, represents the downward longwave radiation corresponding to the natural surface (W / m 2 ), P represents the water vapor pressure (kPa), T represents the surface air temperature (K), and A, B and C are all fitting constants.

[0064] It should be noted that A, B and C vary in different regions and weather conditions.

[0065] For example, taking the photovoltaic power station in region 1 as an example, the values ​​may be: A=0.358, B=-16.43, C=5.67.

[0066] Based on this scheme, when it is impossible to directly obtain the downward long-wave radiation corresponding to the natural surface outside the photovoltaic power station, the surface air temperature and water vapor pressure of the natural surface outside the photovoltaic power station in various time periods can be collected, and then the downward long-wave radiation corresponding to the natural surface in each time period can be accurately calculated through the above-mentioned calculation method, thereby providing accurate data support for estimating the downward long-wave radiation inside the photovoltaic power station.

[0067] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by the embodiment of the present disclosure, after the above S201 or S201a, the following S204 and S205 may be further included: S204: If the original data time is the standard time, determine the time offset value according to the standard time and the local time corresponding to the photovoltaic power station.

[0068] The standard time is the zone time of the standard time adopted in the region where the photovoltaic power station is located. For example, the zone time of the East 8 District where Beijing is located is used in China.

[0069] Exemplarily, the time difference (hours) = (longitude of the photovoltaic power station - longitude corresponding to the standard time) / 15.0.

[0070] S205: Shift the time of the original data as a whole by the time offset value to obtain local time data.

[0071] The original data are the downward long-wave radiation corresponding to the natural surface, or the surface air temperature and water vapor pressure collected from the natural surface.

[0072] Taking Gonghe County, Hainan Tibetan Autonomous Prefecture, Qinghai as an example, the local longitude is 100.567°E, and the time difference is about -1.3 hours, which is 1.3 hours later than Beijing time. The target data sequence needs to be shifted back 1.3 hours as a whole.

[0073] It should be noted that in the embodiments of the present disclosure, when processing the collected data, by using the local time data, time zone interference can be eliminated, ensuring that the collected data is always continuous, thereby improving the reliability and consistency of the collected data and avoiding time-related errors.

[0074] If the time zone of the PV power station is in the eastern zone of standard time, the time of the original data will be shifted forward by the time offset value; If the time zone of the PV power station is in the west of the standard time, the time of the original data will be shifted back by the time offset value.

[0075] It should be noted that since the present disclosure can be used for measuring the thermal insulation effect of large-scale photovoltaic power stations at night, which is highly dependent on time series, unified time series can ensure the reliability of data and improve the accuracy of estimating the downward long-wave radiation in photovoltaic power stations.

[0076] Based on this solution, after obtaining the original data, the time series of the original data can be preprocessed first. By converting the time attributes, the continuity of the data during data processing can be guaranteed, and the overall offset of the calculated downward long-wave radiation value due to the time difference can be avoided, which in turn leads to inaccurate data.

[0077] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by the embodiment of the present disclosure, after the above S205, the following S206 and S207a, or S206 and S207b may be further included: S206 . When collecting raw data at a target time resolution, determine target data of the daily time series to be reorganized in the daily collected data according to the time zone where the photovoltaic power station is located.

[0078] It should be noted that after the local time is converted to the universal time, part of the data of the whole day of the original local time is the data of the previous day or the next day.

[0079] S207a. If the time zone of the photovoltaic power station is in the eastern zone of standard time, the data to be reorganized in the daily collected data are moved to the end of the previous day to form a daily continuous time series sequence, so as to obtain the downward long-wave radiation of the natural surface with a preset distance from the photovoltaic power station at the daily target time resolution.

[0080] S207b. If the time zone of the photovoltaic power station is in the west of the standard time, the data to be reorganized in the daily collected data are moved to the beginning of the next day to form a daily continuous time series sequence, so as to obtain the downward long-wave radiation of the natural surface with a preset distance from the photovoltaic power station and the daily target time resolution.

[0081] For example, if the embodiment of the present disclosure uses data collected every half hour, the 1st to 16th hours of daily data can be moved to the previous day as the 33rd to 48th hours of the previous day, and merged with the 17th to 32nd hours of the current day as the data for the current day.

[0082] Based on this scheme, the time-converted data can be accurately divided into days, which facilitates the determination of the downward longwave radiation with a daily target time resolution of the natural surface based on the time series.

[0083] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by an embodiment of the present disclosure, S202 may be specifically performed by the following S202a and S202b: S202a, determining the total number of daily time series corresponding to the target time resolution.

[0084] S202b. Determine a time series adjustment coefficient based on the total number of daily time series corresponding to the target time resolution and the total number of daily time series corresponding to the half-hourly resolution.

[0085] The target time resolution is the time resolution of the downward longwave radiation corresponding to the natural surface.

[0086] Based on this scheme, a timing adjustment coefficient can be generated for data with different time resolutions, so as to obtain more accurate radiation increments for each time period when generating the radiation increment coefficient, thereby obtaining accurate downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station.

[0087] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by an embodiment of the present disclosure, the above S202 may be specifically performed by the following S202c: S202c, according to formula (2) and the timing adjustment coefficient, based on the timing segmentation, the downward long-wave radiation corresponding to the surface of the photovoltaic power station is calculated, and the radiation increment coefficient of the target time resolution compared with the corresponding downward long-wave radiation of the natural surface.

[0088] ; Formula (2) in, represents the incremental coefficient of the downward longwave radiation of the target time resolution, i represents the time sequence of data acquisition at the target time resolution, N represents the adjustment coefficient of the target time resolution relative to the half-hour resolution, , n represents the total number of daily time series corresponding to the target time resolution.

[0089] For example, taking the half-hour resolution as an example, there are 48 hours from 00:00 local time to 23:30, and they are arranged from 00:00 onwards in order from 0, and i is 0-47.

[0090] Taking half-hour resolution as an example, n=48, N=1 (i.e. no adjustment is required); Taking 10-minute resolution as an example, n=144, N=3 (i.e. adjusted three times).

[0091] Based on this scheme, different time periods of the day can be divided into four sections for calculating the radiation increments separately, so that the downward long-wave radiation increments with significant differences in different time periods can be accurately estimated. Based on the radiation increments in each time period, the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station can be accurately estimated.

[0092] Optionally, in the method for estimating downward longwave radiation in a photovoltaic power station provided by an embodiment of the present disclosure, the above S203 may be specifically performed by the following S203a: Based on formula (3), the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient, the downward long-wave radiation corresponding to each time series of the photovoltaic power station surface is calculated.

[0093] ; Formula (3) in, It indicates the downward long-wave radiation corresponding to each time series of the photovoltaic power station surface every day. It represents the downward longwave radiation corresponding to each time series of the natural surface every day. represents the annual average downward longwave radiation from the natural surface, , a and b are constants, express The collection frequency.

[0094] For example, a=9.71, b=-1.96. If half-hourly time series data is used, there are 365*48 data per year, that is, M=365*48.

[0095] Based on this scheme, the downward long-wave radiation of the surface of the photovoltaic power station can be accurately estimated according to the above formula, the calculated radiation increment coefficient and the obtained natural surface downward long-wave radiation, so as to provide data support for the evaluation of the nighttime insulation effect of large photovoltaic power stations, and then conduct a more extensive evaluation of the ecological and environmental effects of photovoltaic power stations. For example, the long-wave insulation effect of photovoltaic power stations at night can be quantitatively evaluated.

[0096] Figure 3 A logical processing diagram of estimating downward long-wave radiation provided by an embodiment of the present disclosure is shown in FIG. Figure 3 As shown in , the logical processing sequence is: determine the natural surface downward longwave radiation. If there is observation data of the natural surface downward longwave radiation, directly determine whether the observed natural surface downward longwave radiation is local time; if there is no observation data of the natural surface downward longwave radiation, estimate the natural surface downward longwave radiation according to the surface temperature and water vapor pressure of the natural surface at a preset distance from the photovoltaic power station, and then determine whether the estimated natural surface downward longwave radiation is local time; if it is not local time data, convert the time zone; if it is local time data, directly extract daily data of n frequencies; calculate N and ,based on and calculate , get the target downward longwave radiation of n frequencies per day, and then cyclically calculate the downward longwave radiation of the next day.

[0097] Example: Figure 4 A single-day comparison diagram of downward long-wave radiation hour by hour provided by an embodiment of the present disclosure. Figure 4 As shown in the figure, the downward long-wave radiation in the large-scale photovoltaic power station gradually increases after 12:00 compared with the long-wave radiation on the natural surface, and after 21:00 it is stably 30 W / m higher than the long-wave radiation on the natural surface. 2 This phenomenon is the main reason for the nighttime heat preservation effect of the photovoltaic power station. After adopting the estimation model of the present invention, the long-wave radiation of the natural surface can be stably increased to a level close to the observed value from the afternoon to the next morning.

[0098] It should be noted that if the local time conversion is not performed, the calculation results will be displaced in time, and the fluctuation curve (such as Figure 4 The time domain (as shown) will shift to the left or right as a whole, resulting in a large error. The disclosed embodiment converts the standard time into the local time, and can more accurately calculate the downward long-wave radiation in the photovoltaic power station in different time periods.

[0099] Figure 5 A schematic diagram of a year-round comparison of downward long-wave radiation provided by an embodiment of the present disclosure is shown in FIG. Figure 5 As shown in , from the perspective of the whole year, the thermal insulation effect of the photovoltaic power station in winter is significant, and the downward long-wave radiation is significantly higher than that outside the photovoltaic power station. The long-wave radiation estimated by this disclosure is also closer to the observed value inside the photovoltaic power station than the natural surface.

[0100] Corresponding to the aforementioned method embodiments, the present disclosure also provides embodiments of an apparatus and a computer device to which the apparatus is applied.

[0101] The embodiments of the device disclosed herein can be applied to computer devices, such as servers or terminal devices. The device embodiments can be implemented by software, hardware, or a combination of software and hardware. Taking software implementation as an example, a device in a logical sense is determined by the processor of the downward long-wave radiation estimation device in the photovoltaic power station where it is located reading the corresponding computer program instructions in the non-volatile memory into the memory and running them. From the hardware level, if Figure 6 As shown, it is a hardware structure diagram of a computer device where the downward long-wave radiation estimation device in the photovoltaic power station according to the embodiment of the present disclosure is located. Figure 6 In addition to the processor 610, memory 630, network interface 620, and non-volatile memory 640 shown, the server or electronic device where the method 631 for estimating downward long-wave radiation in a photovoltaic power station is located in the embodiment may also include other hardware, usually according to the actual function of the computer device, which will not be described in detail.

[0102] like Figure 7 As shown, Figure 7A schematic diagram of the structure of a device for estimating downward longwave radiation in a photovoltaic power station provided in an embodiment of the present disclosure, the device 700 for estimating downward longwave radiation in a photovoltaic power station includes: an acquisition module 701, an incremental coefficient estimation module 702 and a radiation quantity estimation module 703; the acquisition module is used to acquire the downward longwave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station; the incremental coefficient estimation module is used to determine the timing adjustment coefficient, and estimate the radiation incremental coefficient based on the timing segmentation according to the timing adjustment coefficient; the radiation incremental coefficient indicates the radiation increment of the downward longwave radiation corresponding to the surface in the photovoltaic power station compared with the natural surface; the radiation quantity estimation module is used to estimate the downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward longwave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station and the radiation incremental coefficient.

[0103] Optionally, the incremental coefficient estimation module is specifically used to: determine the total number of daily time series corresponding to the target time resolution; determine the time series adjustment coefficient based on the total number of daily time series corresponding to the target time resolution and the total number of daily time series corresponding to the half-hourly resolution; wherein the target time resolution is the time resolution of the downward longwave radiation corresponding to the acquired natural surface.

[0104] Optionally, the acquisition module is specifically used to: collect the surface air temperature and water vapor pressure of the natural surface at a target time resolution; and estimate the downward longwave radiation corresponding to the natural surface based on the surface air temperature and water vapor pressure of the natural surface at the target time resolution.

[0105] Optionally, the estimation device for the downward long-wave radiation in the photovoltaic power station also includes: a time conversion module; a time conversion module, which is used to obtain the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station, and if the original data time is the standard time, determine the time offset value according to the standard time and the local time corresponding to the photovoltaic power station; move the time of the original data as a whole by the time offset value to obtain the local time data; wherein the original data is the obtained downward long-wave radiation corresponding to the natural surface, or the collected surface air temperature and water vapor pressure of the natural surface.

[0106] Optionally, the estimation device for the downward long-wave radiation in the photovoltaic power station also includes: a timing reorganization module; a timing reorganization module, which is used to determine the target data of the daily time series to be reorganized in the daily collected data after moving the time of the original data as a whole by the time offset value, when the original data is collected at the target time resolution, according to the time zone where the photovoltaic power station is located; if the time zone of the photovoltaic power station is in the eastern zone of the standard time, the daily target data is moved to the end of the previous day, or, if the time zone of the photovoltaic power station is in the western zone of the standard time, the daily target data is moved to the beginning of the next day, to form a daily continuous time series sequence, so as to obtain the daily target time resolution of the downward long-wave radiation of the natural surface at a preset distance from the photovoltaic power station.

[0107] Optionally, the increment estimation module is specifically used to: calculate the downward long-wave radiation corresponding to the surface of the photovoltaic power station based on the time segmentation, compared with the radiation increment coefficient of the target time resolution of the corresponding downward long-wave radiation of the natural surface according to the first preset formula and the timing adjustment coefficient; the first preset formula includes: ;in, represents the incremental factor of the downward longwave radiation of the target time resolution, i represents the timing of acquiring data at the target time resolution, N The target time resolution is relative to the half-hourly resolution. , n Indicates the total number of daily time series corresponding to the target time resolution.

[0108] Optionally, the radiation estimation module is specifically used to calculate the downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station every day based on the second preset formula, the downward longwave radiation corresponding to the natural surface every day and the radiation increment coefficient; the second preset formula includes: ;in, It indicates the downward long-wave radiation corresponding to each time series of the photovoltaic power station surface every day. It represents the downward longwave radiation corresponding to each time series of the natural surface every day. represents the annual average downward longwave radiation from the natural surface, , a and b are constants, express The collection frequency.

[0109] The device for estimating downward long-wave radiation in a photovoltaic power station provided by the embodiment of the present disclosure obtains the downward long-wave radiation of the natural surface at a preset distance from the photovoltaic power station; and determines the timing adjustment coefficient, and estimates the radiation increment coefficient of the downward long-wave radiation corresponding to the surface of the photovoltaic power station compared to the natural surface based on the timing segmentation according to the timing adjustment coefficient; and estimates the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station and the radiation increment coefficient. The scheme provides an estimation model for estimating the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station, which can generate the downward long-wave radiation increment coefficient corresponding to the surface, and use the downward long-wave radiation corresponding to the natural surface outside the photovoltaic power station as the reference radiation of the natural surface in the photovoltaic power station without photovoltaic panels. Based on the reference radiation and the increment coefficient, the downward long-wave radiation in each time period in the photovoltaic power station can be accurately estimated, thereby providing a data basis for quantitative evaluation of the nighttime heat preservation phenomenon.

[0110] Correspondingly, the present disclosure also provides an estimation device for downward long-wave radiation in a photovoltaic power station, the estimation device for downward long-wave radiation in the photovoltaic power station includes a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to: obtain the amount of downward long-wave radiation corresponding to a natural surface at a preset distance from the photovoltaic power station; determine a timing adjustment coefficient, and estimate a radiation increment coefficient based on timing segments according to the timing adjustment coefficient; the radiation increment coefficient indicates the radiation increment of the downward long-wave radiation corresponding to the surface in the photovoltaic power station compared to the natural surface; based on the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient, estimate the amount of downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station.

[0111] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the various steps in the above method embodiment are implemented.

[0112] The present disclosure also provides a computer device, which includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the computer-readable instructions implement the various steps in the above-mentioned method embodiment when executed by the processor.

[0113] The implementation process of the functions and effects of each module in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, which will not be repeated here.

[0114] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the modules determined as separated components may or may not be physically separated, and the components determined as module displays may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed scheme. A person of ordinary skill in the art can understand and implement it without paying creative labor.

[0115] The above describes specific embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0116] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the inventions claimed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not claimed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0117] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0118] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A method for estimating downward long-wave radiation in a photovoltaic power station, characterized in that: The method comprises: Obtain downward longwave radiation corresponding to a natural surface at a preset distance from the photovoltaic power station; Determine a timing adjustment coefficient, and estimate a radiation increment coefficient based on the timing segmentation according to the timing adjustment coefficient; the radiation increment coefficient indicates the radiation increment of the downward long-wave radiation corresponding to the surface in the photovoltaic power station compared with the natural surface; The downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station is estimated according to the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient.

2. The method according to claim 1, characterized in that The determining of the timing adjustment coefficient includes: Determine the total number of daily time series corresponding to the target time resolution; Determining the time series adjustment coefficient based on the total number of daily time series corresponding to the target time resolution and the total number of daily time series corresponding to the half-hourly resolution; The target time resolution is the time resolution of the downward longwave radiation corresponding to the natural surface obtained.

3. The method according to claim 2, characterized in that The step of obtaining downward longwave radiation corresponding to a natural surface at a preset distance from the photovoltaic power station includes: collecting the surface air temperature and water vapor pressure of the natural surface at the target time resolution; The downward longwave radiation of the natural surface at the target time resolution corresponding to the natural surface is estimated based on the surface air temperature and water vapor pressure of the natural surface at the target time resolution.

4. The method according to claim 3, characterized in that After obtaining the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station, the method further includes: If the original data time is the standard time, determining the time offset value according to the standard time and the local time corresponding to the photovoltaic power station; The time of the original data is shifted as a whole by the time offset value to obtain the data of the local time; The original data is the amount of downward long-wave radiation corresponding to the natural surface, or the surface air temperature and water vapor pressure of the natural surface.

5. The method according to claim 4, characterized in that After the time of the original data is moved as a whole by the time offset value, the method further comprises: In the case where the raw data is collected at the target time resolution, the target data of the daily time series to be reorganized in the data collected daily is determined according to the time zone where the photovoltaic power station is located; If the time zone of the photovoltaic power station is in the east zone of the standard time, the target data of each day is moved to the end of the previous day; or, if the time zone of the photovoltaic power station is in the west zone of the standard time, the target data collected daily is moved to the beginning of the next day, forming a daily continuous time series sequence, so as to obtain the downward long-wave radiation of the target time resolution of each day on the natural surface at a preset distance from the photovoltaic power station.

6. The method according to any one of claims 2 to 5, characterized in that: The step of estimating the radiation increment coefficient based on the timing segment according to the timing adjustment coefficient includes: According to the first preset formula and the timing adjustment coefficient, the downward long-wave radiation corresponding to the surface of the photovoltaic power station is calculated based on the timing segmentation, and the radiation increment coefficient of the target time resolution compared with the corresponding downward long-wave radiation of the natural surface; The first preset formula includes: ; in, represents the incremental coefficient of the downward longwave radiation for the target time resolution, i represents the timing of collecting data at the target time resolution, N represents the timing adjustment factor of the target time resolution relative to the half-hour resolution, , n Indicates the total number of daily time series corresponding to the target time resolution.

7. The method according to claim 6, characterized in that The estimating the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient includes: Calculate the downward longwave radiation corresponding to each time series of the surface of the photovoltaic power station every day based on the second preset formula, the downward longwave radiation corresponding to the natural surface every day and the radiation increment coefficient; The second preset formula includes: ; in, It indicates the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station every day, represents the downward longwave radiation corresponding to each time series of the natural surface every day, represents the annual average downward longwave radiation of the natural surface, , a and b are constants, express The collection frequency.

8. A device for estimating downward long-wave radiation in a photovoltaic power station, characterized in that: The estimation device comprises: an acquisition module, an increment coefficient estimation module and a radiation amount estimation module; The acquisition module is used to acquire the downward long-wave radiation corresponding to the natural surface at a preset distance from the photovoltaic power station; The increment coefficient estimation module is used to determine the timing adjustment coefficient, and estimate the radiation increment coefficient based on the timing segmentation according to the timing adjustment coefficient; the radiation increment coefficient indicates the radiation increment of the downward long-wave radiation corresponding to the surface in the photovoltaic power station compared with the natural surface; The radiation estimation module is used to estimate the downward long-wave radiation corresponding to each time series of the surface of the photovoltaic power station according to the downward long-wave radiation corresponding to the natural surface and the radiation increment coefficient.

9. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for estimating downward long-wave radiation in a photovoltaic power station as described in any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method for estimating downward long-wave radiation in a photovoltaic power station as described in any one of claims 1 to 7 are implemented.

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