KR20160078920A - Method and apparatus for calculating irradiance of target point - Google Patents

Method and apparatus for calculating irradiance of target point Download PDF

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KR20160078920A
KR20160078920A KR1020150186149A KR20150186149A KR20160078920A KR 20160078920 A KR20160078920 A KR 20160078920A KR 1020150186149 A KR1020150186149 A KR 1020150186149A KR 20150186149 A KR20150186149 A KR 20150186149A KR 20160078920 A KR20160078920 A KR 20160078920A
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target point
calculating
solar radiation
amount
observation points
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장평화
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오씨아이 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W1/12—Sunshine duration recorders
    • G06F19/00—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J2001/4266—Photometry, e.g. photographic exposure meter using electric radiation detectors for measuring solar light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J2001/4266—Photometry, e.g. photographic exposure meter using electric radiation detectors for measuring solar light
    • G01J2001/4285—Pyranometer, i.e. integrating over space

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Abstract

The present invention relates to a method and a device for calculating solar radiation of a target point. The method for calculating the solar radiation of the target point comprises: a step for calculating total solar radiation and a global horizontal irradiation for one or more area measuring points; a step for calculating a global horizontal irradiation compensating value of the target point by using the total solar radiation and the global horizontal irradiation for each area measuring point; and a step for calculating the total solar radiation of the target point by using the global horizontal irradiation compensating value of the target point and the total solar radiation of the target point.

Description

METHOD AND APPARATUS FOR CALCULATING IRRADIANCE OF TARGET POINT [0002]

The present invention relates to a method and apparatus for calculating a solar radiation amount at a target point.

The United Nations Framework Convention on Climate Change (UNFCCC) was signed in 1992 and launched in March 1994 as a result of calls to global awareness of global warming over the years. Since then, as part of efforts to reduce greenhouse gas emissions, the main contributor to global warming, many countries have implemented policies to promote renewable energy such as solar power. In many developed countries, we have implemented a system to support the generation of electricity, and we have set a 20% to 50% solar supply requirement by each target year. In the case of Korea, solar energy equipment has been growing in popularity with annual average growth rate of 130%. And educational facilities such as schools show an increase of about 800%.

From a technical point of view, unlike other renewable energy sources such as wind power, wave power, and tidal power, which require large sites or facilities and energy production sites far away from power demand sites such as downtown, It is possible to produce electric power in various forms and sizes in buildings or buildings, and it can be used together with solar heat. It can be mass-produced by modularization, and efficiency is greatly improved due to large-scale investment and technology development.

A photovoltaic system is generally referred to as a photovoltaic (PV) system. The economic viability of the PV system is also influenced by the manner in which it copes with changes in the intensity of sunlight for a short period of time, but rather by the solar radiation. Traditionally, efforts to streamline PV systems have focused on improving PV materials, improving power conversion efficiency, improving power reserve equipment, and solar tracking devices, but in reality, the problem of installing PV systems This is a more important problem than the increase in efficiency obtained by the improvement of these technologies. In addition, if a PV system must be installed on a certain site, it is necessary to estimate how much to install the PV system in order to obtain the target amount of power, or conversely, There may be a problem. All of these problems can be solved by knowing exactly solar irradiance. Therefore, in order to maximize the economical efficiency of the PV system, the amount of solar radiation must be accurately determined.

However, solar radiation is largely influenced by the latitude that determines the angle of incidence of sunlight and the weather conditions that determine the extent to which solar radiation is absorbed in the atmosphere until it reaches the surface. In Korea, the radiation level is measured at the Meteorological Agency (Meteorological Agency) observation sites in 24 regions, and the monthly insolation values for the past 30 years are constructed in the database. However, actual survey data of an area without the Meteorological Agency observation point can not be obtained unless it is surveyed directly for a long time.

Therefore, there has been a need to estimate the solar radiation amount in the area where there is no actual solar radiation data. Several estimation methodologies have been applied for the estimation of solar radiation. ANN (Artificial Neural Network) model, GIS (Geographic Information System) model, and satellite based model have been proposed. However, ANN modeling has a disadvantage in that estimation accuracy is excellent but it can not explain the basis of the estimation result. GIS model or satellite based model is based on the map distance between the estimated area and the actual area, There is a disadvantage that the reliability is low.

An object of the present invention is to provide a method and an apparatus for calculating a solar radiation amount at a target point that can predict various solar radiation amounts with high accuracy and reliability due to actual climate and geographical influences.

It is another object of the present invention to provide a method and an apparatus for calculating a solar radiation amount at a target point that can estimate potential solar energy directly related to solar radiation through an efficient downscaling technique using meteorological observation data obtained from a local observation network.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In accordance with another aspect of the present invention, there is provided a method for calculating a solar radiation amount at a target point, comprising the steps of: calculating a solar radiation amount and a cloud degree for each of one or more regional observation points; Calculating an interpolated value of the target point at the target point by using the ambiguity, calculating the solar radiation amount at the target point by using the ambiguous interpolation value of the target point and the ambiguous solar radiation amount of the target point .

The present invention also provides a radiation dose calculation apparatus for a target point, comprising: a first calculation section for calculating a sunray dose and a cloud angle for each of one or more regional observation points; a first calculation section for calculating a sunray dose and a clearance degree for each of the one or more regional observation points A third calculation unit for calculating an all-around-radiation dose at the target point by using a clearance interpolation value of the target point and a clearance amount of sunlight at the target point, .

According to the present invention as described above, it is possible to predict the solar radiation having various aspects due to the actual climate and geographical influences with high accuracy and reliability.

According to the present invention, the latent solar energy directly related to the solar radiation amount can be estimated through the efficient downscaling technique using the weather observation data obtained from the local observation network.

1 is a block diagram of an apparatus for calculating a solar radiation amount at a target point according to the present invention.
FIG. 2 is an illustration of a target point and a region observation point according to an embodiment of the present invention.
3 is a flowchart of a method for calculating a solar radiation amount at a target point according to the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

1 is a block diagram of an apparatus for calculating a solar radiation amount at a target point according to the present invention.

Referring to FIG. 1, a target point radiation dose calculation apparatus 102 according to the present invention includes a first calculation unit 104, a second calculation unit 106, and a third calculation unit 108.

The first calculation unit 104 calculates the solar radiation amount and the cloudiness for each of one or more regional observation points. In one embodiment of the present invention, the first calculator 104 may calculate a solar radiation dose for each of one or more regional observation points using the direct sunlight dose and the scattered radiation dose, the ground albedo, and the atmospheric reflectance for each of the one or more local observation points Can be calculated. Also, in one embodiment of the present invention, the first calculation unit 104 may calculate the degree of ambiguity for each of one or more regional observation points using the solar radiation amount and the spring radiation amount for each of the one or more regional observation points.

The second calculation unit 106 calculates the blue sky interpolation value of the target point by using the blue sky radiation dose and the ambiguity degree for each of the one or more regional observation points calculated by the first calculation unit. In one embodiment of the present invention, the second calculation unit 106 calculates the clearance interpolation value of the target point using the degree of ambiguity and the weight for each of the one or more local observation points. The weight is inversely proportional to the distance from each of the one or more local observation points to the target point.

The third calculation unit 108 calculates the solar radiation amount of the target point at all of the target points using the blue sky degree interpolation value at the target point and the sunlight amount at the target point. In an embodiment of the present invention, the third calculation unit 108 may calculate the solar radiation dose to the target point by using the direct sun irradiation amount and the scattered radiation dose, the ground albedo, and the atmospheric reflectance for the target point.

Hereinafter, a method for calculating a solar radiation amount at a target point according to the present invention will be described in detail with reference to FIGS. 1 and 2. FIG.

FIG. 2 is an illustration of a target point and a region observation point according to an embodiment of the present invention.

In the present invention, the solar radiation amount of the target point P is more accurately calculated by using the local weather data observed at one or more regional observation points existing around the target point P. Although only three regional observation points (i1, i2, i3) are shown in FIG. 2 for convenience of description, more or fewer regional observation points may be calculated for the irradiation amount of the target point P Can be used.

In the present invention, the reference radius can be set around the target point P, and only the regional observation point existing within the reference radius can be used for calculating the irradiation dose of the target point P. The reference radius is a value that can be arbitrarily set by the operator, and as the reference radius increases, the number of regional observation points used for calculating the irradiation amount of the target point P may also increase.

Further, in another embodiment of the present invention, the operator may directly designate a local observation point to be used for calculating the irradiation dose of the target point P among the local observation points around the target point P.

When the regional observation points i1, i2 and i3 to be used for calculating the irradiation dose of the target point P are determined centering on the target point P as shown in FIG. 2, the first calculation unit 104 first calculates the local observation points And the atmospheric reflectance of the surface albedo are used to calculate the solar irradiance for each local observation point. The first calculation unit 104 can calculate the solar radiation dose for each of the local observation points using the following equation.

Figure pat00001

In Equation (1)

Figure pat00002
Means the amount of solar radiation at the i-th regional observation point. For reference, the mean annual solar irradiance refers to the global horizontal irradiance (GHI) at the time of the clear sky assumption. Also
Figure pat00003
Refers to the amount of direct sunlight at the i-th regional observation point, ie, the amount of radiation that reaches the horizontal plane of the i-th regional observation point directly from the sun without scattering by air elements such as dust or aerosols. Also
Figure pat00004
Refers to the amount of scattered radiation scattered by the atmospheric components such as dust or aerosol, ie, the scattered radiation dose at the i-th regional observation point. In the present invention, the direct sun radiation amount and the scattered solar radiation amount of the i-th regional observation point can be calculated in advance using the weather observation data obtained at each regional observation point.

In Equation (1)

Figure pat00005
Is the ground albedo of the i-th regional observation point,
Figure pat00006
Is the atmospheric reflectivity representing the aerosol scattering penetration at the i-th regional observation point. In the present invention, the ground albedo and the atmospheric reflectivity are constant values predetermined for each area observation point.

For reference, direct sunlight and scattered solar radiation at each site is a function of elements such as solar radius vector, Rayleigh scattering, ozone absorption, water vapor permeability, aerosol absorption rate, atmospheric reflectance, solar constant and solar zenith angle. In the present invention, the sum of the direct sunlight amount and the scattered solar radiation amount is corrected through the ground albedo and the atmospheric reflectance in order to consider the amount of solar radiation lost together with the direct sunlight amount and the scattered solar radiation amount.

Next, the first calculation unit 104 calculates the degree of ambiguity for each of the local observation points using the solar radiation amount and the solar radiation amount for each of the local observation points. The first calculation unit 104 calculates the degree of ambiguity for each of the local observation points using the following equation.

Figure pat00007

In Equation (2)

Figure pat00008
Is the clearness index for the i th regional observation point. Also
Figure pat00009
Is the total solar irradiance at the i-th regional observation point. The total solar irradiance at the i-th regional observation point can be included in the meteorological observation data obtained at each regional observation point.

Next, the second calculation unit 106 calculates the seedling angle interpolation value for calculating the all-seeding irradiation amount of the target point P by using the degree of ambiguity and the weight of each local observation point calculated by the first calculation unit 104 . The second calculation unit 106 calculates a clearance interpolation value of the target point P using the following equation.

Figure pat00010

In Equation (3), n represents the number of the regional observation points used for calculation of the total irradiation amount of the target point P. Also

Figure pat00011
Represents the interpolation value of the ambiguity of the target point P. In Equation (3)
Figure pat00012
Is the weight for the i-th regional observation point as follows.

Figure pat00013

In Equation (4)

Figure pat00014
Means the distance from the target point P to the i-th area observation point as shown in Fig. As shown in Equation (4), the weight for each local observation point is defined to be inversely proportional to the distance from the target point P to each local observation point, so that a larger weight can be applied to a closer region.

Next, the third calculation section 108 calculates the total solar radiation amount of the target point P by using the clearance interpolation value of the target point P calculated by the second calculation section and the sunlight solar radiation amount of the target point P . The third calculation unit 108 first calculates the solar radiation amount of the target point P using the weather observation data for the target point P as follows.

Figure pat00015

In Equation (5)

Figure pat00016
Represents the direct sunlight irradiance of the target point P,
Figure pat00017
Means the scattered radiation amount of the target point P.

The third calculation unit 108 calculates the target sunrise amount of the target point P and the sunrise degree interpolation value of the target point P calculated by the second calculation unit 106, Calculate the total solar irradiance at the point (P).

Figure pat00018

In Equation (6)

Figure pat00019
Means the total solar radiation of the target point P.

Through the process as described above, it is possible to acquire the whole solar radiation amount of the target point which can not directly measure the solar radiation amount in a relatively simple manner. According to the present invention, as compared with the conventional method of estimating the solar radiation amount at the target point by simple interpolation of the solar radiation forecast value, it is possible to more accurately calculate the solar radiation amount because it can reflect the geographical and meteorological specificity of the target point itself .

3 is a flowchart of a method for calculating a solar radiation amount at a target point according to the present invention.

Referring to FIG. 3, the apparatus for calculating a radiation dose at a target point according to the present invention first calculates a solar radiation dose and a degree of ambiguity for each of one or more regional observation points (302). In one embodiment of the present invention, the step 302 of calculating the solar radiation dose and the degree of sunshine is performed using at least one local observation point (s) using the direct sunlight dose and the scattered radiation dose, the ground albedo, And calculating the amount of solar radiation for each of them. Also, in one embodiment of the present invention, the step 302 of calculating the solar radiation dose and cloud angle is performed using the solar radiation dose and the total solar radiation dose for each of the one or more regional observation points, And a step of calculating

Next, the irradiance calculator of the target point according to the present invention calculates the radiant interpolation value of the target point by using the solar radiation amount and the ambiguity degree for each of the one or more regional observation points (304). In one embodiment of the present invention, computing a clearance interpolation value for a target point (step 304) includes calculating a clearance interpolation value for the target point using the degree of ambiguity and weight for each of the one or more localized observation points . ≪ / RTI > The weight is inversely proportional to the distance from each of the one or more local observation points to the target point.

Next, the apparatus for calculating the radiation dose at the target point according to the present invention calculates the radiation dose at the target point (306) using the clearance interpolation value of the target point and the clearance amount of sunlight at the target point. In one embodiment of the present invention, step 306 of calculating an all-day irradiation dose at a target point may include calculating a total solar radiation dose at the target point using the direct sunlight dose and the scattered radiation dose, the ground albedo, .

According to the present invention as described above, it is possible to predict the solar radiation having various aspects due to the actual climate and geographical influences with high accuracy and reliability.

According to the present invention, the latent solar energy directly related to the solar radiation amount can be estimated through the efficient downscaling technique using the weather observation data obtained from the local observation network.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

Claims (12)

Calculating a solar radiation dose and a cloud angle for each of the one or more local observation points;
Calculating an ambiguous interpolation value of the target point using the ambiguous solar radiation amount and ambiguity degree for each of the one or more local observation points;
Calculating an all-around solar radiation amount of the target point using the clearance interpolation value of the target point and the clearance amount of sunlight at the target point
Method of calculation of solar irradiance at target point.
The method according to claim 1,
The amount of solar radiation for each of the one or more regional observation points
Is calculated using the direct sun radiation amount and the scatter radiation amount, the ground albedo, and the atmospheric reflectance for each of the one or more regional observation points
Method of calculation of solar irradiance at target point.
The method according to claim 1,
The ambiguity for each of the one or more regional observation points
Is calculated using the solar radiation amount and the total solar radiation amount for each of the one or more regional observation points
Method of calculation of solar irradiance at target point.
The method according to claim 1,
The clear-sky interpolation value of the target point is
Is calculated using the degree of ambiguity and weight for each of the one or more regional observation points
Method of calculation of solar irradiance at target point.
5. The method of claim 4,
The weight
Wherein the distance from each of the one or more local observation points to the target point is inversely proportional to
Method of calculation of solar irradiance at target point.
The method according to claim 1,
The amount of solar radiation for the target point is
Calculated using the direct sunlight amount and the scattered solar radiation amount, the ground albedo, and the atmospheric reflectance for the target point
Method of calculation of solar irradiance at target point.
A first calculation unit for calculating a solar radiation amount and a cloudiness degree for each of one or more local observation points;
A second calculation unit for calculating a blue sky degree interpolation value of the target point by using the blue sky radiation dose and the blue sky degree for each of the one or more regional observation points;
And a third calculation unit for calculating an all-around-radiation dose at the target point using the clearance interpolation value of the target point and the clearance amount of solar radiation at the target point
A device for calculating the irradiance of a target point.
8. The method of claim 7,
The first calculation unit
Calculating a solar radiation amount for each of the one or more local observation points using the direct sunlight irradiation amount and the scattered solar radiation amount, the ground albedo, and the atmospheric reflectance for each of the one or more local observation points
A device for calculating the irradiance of a target point.
8. The method of claim 7,
The first calculation unit
Calculating a degree of ambiguity for each of the one or more local observation points using the solar radiation amount and the solar radiation amount for each of the one or more regional observation points
A device for calculating the irradiance of a target point.
8. The method of claim 7,
The second calculation unit
Calculating a clearance interpolation value of the target point by using the degree of ambiguity and the weight for each of the one or more local observation points
A device for calculating the irradiance of a target point.
11. The method of claim 10,
The weight
Wherein the distance from each of the one or more local observation points to the target point is inversely proportional to
A device for calculating the irradiance of a target point.
8. The method of claim 7,
The third calculation unit
The solar radiation amount for the target point is calculated using the direct sun irradiation amount and the scattered radiation amount, the ground albedo, and the atmospheric reflectance for the target point
A device for calculating the irradiance of a target point.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180079159A (en) * 2016-12-30 2018-07-10 한국에너지기술연구원 Calibration method for solar insolation derived from meteorological satellite on clear sky
KR101940313B1 (en) * 2018-03-10 2019-01-18 전주비전대학교산학협력단 Appropriate location selection method of solar photovoltaic power station using aerial laser scanning data processing and space analysis technique
KR102066871B1 (en) * 2019-07-15 2020-01-16 한국과학기술정보연구원 Measuring method for air quality and measuring system for air quality
US11294098B2 (en) * 2017-07-03 2022-04-05 Kabushiki Kaisha Toshiba Solar irradiance intensity estimation apparatus, solar irradiance intensity estimation system, and solar irradiance intensity estimation method
KR20220150598A (en) * 2021-05-04 2022-11-11 한국에너지기술연구원 Apparatus for generating solar radiation map based vector and method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180079159A (en) * 2016-12-30 2018-07-10 한국에너지기술연구원 Calibration method for solar insolation derived from meteorological satellite on clear sky
US11294098B2 (en) * 2017-07-03 2022-04-05 Kabushiki Kaisha Toshiba Solar irradiance intensity estimation apparatus, solar irradiance intensity estimation system, and solar irradiance intensity estimation method
KR101940313B1 (en) * 2018-03-10 2019-01-18 전주비전대학교산학협력단 Appropriate location selection method of solar photovoltaic power station using aerial laser scanning data processing and space analysis technique
KR102066871B1 (en) * 2019-07-15 2020-01-16 한국과학기술정보연구원 Measuring method for air quality and measuring system for air quality
KR20220150598A (en) * 2021-05-04 2022-11-11 한국에너지기술연구원 Apparatus for generating solar radiation map based vector and method thereof

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