CN116384795A - Inclined plane solar radiation amount conversion photovoltaic power generation potential evaluation method - Google Patents
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Abstract
The invention discloses a photovoltaic power generation potential evaluation method for inclined plane solar radiation conversion, which comprises the following steps: s1, determining a formula for calculating the potential of photovoltaic power generation; s2, determining an optimal inclination angle; s3, determining a solar altitude; s4, determining an atmospheric transparency coefficient; s5, solving direct radiation and scattering according to known total radiation data; s6, determining the solar radiation quantity of the inclined plane; s7, determining the minimum occupied area of the single photovoltaic panel; s8, determining the maximum area of the practical research area where the photovoltaic panel can be paved; s9, calculating the potential of photovoltaic power generation. The photovoltaic power generation potential evaluation method for the inclined plane solar radiation conversion is adopted, so that the photovoltaic power generation potential calculation result is more accurate and accords with the reality, the scheme adaptation range is wide, the effective utilization of solar energy resources can be improved, and theoretical basis can be provided for the establishment and implementation of the photovoltaic industry policy.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power generation potential evaluation method for inclined plane solar radiation quantity conversion.
Background
Renewable energy sources have received great attention to avoid reliance on fossil fuel supplies and to minimize environmental impact. Among all renewable energy sources, solar energy is considered to be the fastest growing energy source with its obvious advantages of cleanliness, safety, inexhaustible, and inexhaustible use. However, the market development of solar energy is greatly affected by policies, technical development, local natural conditions and the like, so that it is necessary to analyze the photovoltaic power generation potential by taking the influence factors into consideration, and a theoretical basis is provided for future long-term planning of photovoltaic development.
Centralized photovoltaic power generation facilities are the main forms of photovoltaic power generation application systems in China. Photovoltaic potential mainly comprises three aspects: geographic, technical and economic potential. Wherein the geographic potential refers to the annual solar radiation amount over a suitable area of the area, and the technical potential refers to the evaluation of the value of the conversion of the solar radiation amount into electric energy by the PV system on the basis of the geographic potential. The current methods for evaluating the technical potential mainly comprise a formula method, an index evaluation method and a 3D modeling method. The formula method is the most convenient and simple method and the most widely used method. The current calculation formula generally comprises photovoltaic panel area, photovoltaic module efficiency, shading coefficient, performance ratio, photovoltaic system use peak value, photovoltaic panel received annual radiation quantity and the like, wherein the radiation quantity is usually represented by direct radiation quantity DNI (direct normal irradiance) and global level radiation GHI (global horizontal irradiance) under normal conditions, DNI is suitable for a photovoltaic system PV, and GHI is suitable for a concentrating solar power generation system CSP. The basic photovoltaic power generation potential formula is as follows: tpse=ghi (or DNI) ×ef×area×pr. TPSE is a technical potential value of a photovoltaic system and a concentrating solar power generation system; GHI (or DNI) is photovoltaicSolar radiation amount of the system and the concentrating solar system; EF is the efficiency of the photovoltaic system in converting sunlight into electricity; AREA is a suitable AREA for construction of photovoltaic systems and concentrating solar systems; PR is the performance ratio of a system. Some authors improve the calculation technology potential formula, namely the photovoltaic power generation potential formula, for example, in consideration of the national policy on controlling the land used for the project of the photovoltaic power station engineering, different regions have definite land limitation, so that the improvement is carried out on the basis of solving the photovoltaic power generation potential formula, and the formula is as follows:
wherein LCF represents the land conversion factor.
At present, the solar radiation amount in the formulas is mainly horizontal radiation amount, but the photovoltaic panel is obliquely paved for receiving more solar radiation, the received solar radiation amount is not the horizontal radiation amount but the inclined plane solar radiation, the traditional formulas cannot accurately evaluate the electric energy converted by the photovoltaic panel after receiving the solar radiation, and a method for evaluating the photovoltaic power generation potential needs to be improved.
Disclosure of Invention
The invention aims to provide the photovoltaic power generation potential evaluation method for the inclined plane solar radiation conversion, which can enable the calculation result of the photovoltaic power generation potential to be more accurate and conform to the reality, has wide range of scheme adaptation, can improve the effective utilization of solar energy resources, and can also provide theoretical basis for the establishment and implementation of the photovoltaic industry policy.
In order to achieve the above purpose, the invention provides a photovoltaic power generation potential evaluation method for inclined plane solar radiation amount conversion, which comprises the following steps:
s1, determining a formula for calculating the potential of photovoltaic power generation;
s2, determining an optimal inclination angle;
s3, determining a solar altitude;
s4, determining an atmospheric transparency coefficient;
s5, solving direct radiation and scattering according to known total radiation data;
s6, determining the solar radiation quantity of the inclined plane;
s7, determining the minimum occupied area of the single photovoltaic panel;
s8, determining the maximum area of the practical research area where the photovoltaic panel can be paved;
s9, calculating the potential of photovoltaic power generation.
Preferably, in step S1, the horizontal radiation amount is corrected to an inclined plane radiation amount on the basis of a general solving photovoltaic power generation potential formula.
Preferably, in step S2, the optimal inclination angle of each latitude photovoltaic panel is fitted as a quadratic function, the fitting degree is 0.993, and the optimal inclination angle formula is as follows:
β＝-0.0049Φ 2 +1.0888Φ
where β is the optimal inclination angle Φ is the latitude.
Preferably, in step S3, the declination angle, the hour angle and the solar altitude angle of the investigation region are calculated respectively, and the formula is as follows:
δ＝23.45sin[360°(284+n)/365]
ω＝15(t-12)
sin h＝sinΦsinδ+cosΦcosδcosω
wherein δ represents a declination angle; n represents a date number in one year; since the research evaluates that the maximum photovoltaic power generation amount is the highest solar radiation in one year, the corresponding selection of the summer date is used as a time parameter, namely n is 173; omega represents a time angle; t is the time point of 0-24 hours, and 12 is taken because 12 pm is when the solar altitude is maximum and the solar radiation intensity is strongest; h represents the solar altitude; Φ represents the latitude of the investigation region.
Preferably, in step S4, when calculating the atmospheric mass, a proper formula is selected for calculation in combination with the solved solar altitude, and the atmospheric correction coefficient, the revised atmospheric mass, and the atmospheric transparency coefficient are sequentially calculated as follows:
(1) When h is more than or equal to 30 degrees, m=1/sin h
(2) When h < 30 °, m= [1229+ (614×sin h) 2 ] 1/2 -614×sin h
P(z)/P 0 ＝[(288-0.0065L)/288] 5.256
m(z，h)＝m×P(z)/P 0
P＝0.56(e -0.56m(z，h) +e -0.096m(z，h) )
Wherein m represents the mass of the atmosphere; h represents the solar altitude; p (z)/P 0 Representing an atmospheric pressure correction coefficient; l represents the altitude of the area under investigation; m (z, h) represents the revised atmospheric mass; p represents the atmospheric transparency coefficient.
Preferably, in step S5, the direct and scattered values are calculated by combining the direct and scattered ratio, the solar total radiation data, and the calculated atmospheric mass and atmospheric transparency coefficients, respectively, as follows:
I DH ＝I 0 ×P m ×sin h
I dH ＝1/2×I 0 ×sin h×(1-P m )/(1-1.4ln P)
I DH +I dH ＝I
R＝I dH /I DH ＝(1-P m )/[2×P m ×(1-1.4ln P)]
wherein I is DH Representing direct radiation; i 0 Representing the solar constant; p represents an atmospheric transparency coefficient; m represents the atmospheric mass; h represents the solar altitude; i dH Representing scattering; i represents total radiation; r represents the ratio between scattering and direct radiation; the solar constants vary each year, so direct radiation and scatter calculations using the solar constants directly result in inaccuracy, more accurate calculations based on the direct radiation to scatter ratio and the total solar radiation.
Preferably, in step S6, the ratio of the inclined surface to the horizontal plane direct radiation amount and the inclined surface radiation amount are sequentially calculated using the calculated optimal inclination angle, declination angle, time angle, scattering and direct radiation, and the formula is as follows:
I T ＝I DH ×R b +1/2×I dH ×(1+cosβ)+1/2×ρ×I×(1-cosβ)
wherein R is b Representing the ratio of the inclined surface to the direct radiation amount of the horizontal surface; phi represents the latitude of the study area; beta represents an optimal inclination angle; delta represents declination angle; omega represents a time angle; i T Indicating the solar radiation quantity on the inclined plane; i DH Representing direct radiation; i dH Representing scattering; ρ represents the ground reflectance, typically 0.2.
Preferably, in step S7, the minimum distance between the arrays of the photovoltaic panels is based on the solar panel shadow length from winter to day, and the minimum occupied area of the single photovoltaic panel is solved as follows:
d＝l 1 cosβ+(l 1 sinβ)/tan(66，55-Φ)
A＝l 2 ×d
wherein d represents a minimum plate pitch; l (L) 1 Representing the photovoltaic panel width; l (L) 2 Representing the length of the photovoltaic panel; beta represents an optimal inclination angle; phi represents the latitude of the study area; a represents the minimum footprint of a single panel.
Preferably, in step S8, the calculation formula is as follows:
A a ＝A r /A×l 1 ×l 2
wherein A is a The maximum area of the photovoltaic panel can be paved for the actual research area; a is that r Representing the geographical area of the actual investigation region; a represents the minimum footprint of a single panel.
Preferably, in step S9, the calculation formula is as follows:
E PV ＝η×A a ×I T ×PR×(1-F S )
wherein E is PV Representing the potential of photovoltaic power generation; η is the efficiency of the photovoltaic module; a is that a The maximum area of the photovoltaic panel can be paved for the actual research area; i T Is the radiation quantity of the inclined plane; PR is the performance ratio, which is the ratio of the final yield of the system to the reference yield; f (F) S Is a shading coefficient.
Therefore, the photovoltaic power generation potential evaluation method for inclined plane solar radiation conversion has the beneficial effects that compared with the prior art:
(1) According to the invention, the existing photovoltaic power generation potential formula is improved, and the horizontal radiation intensity commonly used in the traditional solving formula is changed into the inclined plane radiation intensity of the photovoltaic panel, so that the photovoltaic power generation potential calculation result is more accurate and accords with the reality.
(2) The scheme provided by the invention has wide application range, can be suitable for grid small-scale calculation, and can be also used for calculating large-scale photovoltaic potential of provincial countries and the like.
(3) The method has important reference significance for the subsequent establishment of the photovoltaic installed capacity target and the construction site selection of the power plant, improves the effective utilization of solar energy resources, and has good application prospect; meanwhile, a theoretical basis can be provided for formulating and implementing the photovoltaic industry policy.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a frame diagram of a photovoltaic power generation potential evaluation method of inclined plane solar radiation amount conversion according to the present invention.
Detailed Description
The technical scheme of the invention is further described below through the attached drawings and the embodiments.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art. Such other embodiments are also within the scope of the present invention.
It should also be understood that the above-mentioned embodiments are only for explaining the present invention, the protection scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the protection scope of the present invention by equally replacing or changing the technical scheme and the inventive concept thereof within the scope of the present invention.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered part of the specification where appropriate.
The disclosures of the prior art documents cited in the present specification are incorporated by reference in their entirety into the present invention and are therefore part of the present disclosure.
As shown in fig. 1, the photovoltaic power generation potential evaluation method for inclined plane solar radiation amount conversion provided by the invention comprises the following steps:
s1, determining the optimal inclination angle of the photovoltaic panel. According to the document Photovoltaic potential and land-use estimation methodology, the optimal inclination angle of each latitude photovoltaic panel is fitted as a quadratic function with a fitting degree of 0.993. The formula is as follows:
β＝-0.0049Φ 2 +1.0888Φ
wherein, beta represents an optimal inclination angle; Φ represents the latitude of the investigation region.
Sichuan province was chosen as the subject of the specific embodiment, a grid with a study scale of 0.75 degrees by 0.75 degrees. According to the region suitable for solar energy resource development in China in 2015, grid points distributed on a proper area and corresponding solar radiation amounts are approximately selected by comparing grid data corresponding to average values of solar radiation amounts in 1979-2017 of China, and the results are shown in the following table 1. According to the latitude of the selected grid point, the optimal inclination angle can be calculated by substituting the formula in the step S1, and the result is shown in the table 1. The solar radiation dataset is weather re-analysis data provided by the mid-european weather prediction centre (ECMWF).
Table 1 solar radiation amounts and optimal inclinations for each point
The following steps S3 to S6 are to solve the intensity of the inclined plane solar radiation received by the photovoltaic panel.
S3, determining the solar altitude angle. According to the definition of declination angle, hour angle and solar altitude angle in the literature 'solar heat utilization', the declination angle, hour angle and solar altitude angle of the research area are calculated respectively. The formula is as follows:
δ＝23.45sin[360°(284+n)/365]
ω＝15(t-12)
sin h＝sinΦsinδ+cosΦcosδcosω
wherein δ represents a declination angle; n represents a date number in one year, and the study herein evaluates the photovoltaic maximum power generation, so that the corresponding summer-to-date is selected as the study time, and n is 173; omega represents a time angle; t is the time point of 0-24 hours. Since 12 pm is when the solar altitude is the maximum and the solar radiation intensity is the strongest, t is 12; h represents the solar altitude; Φ represents the latitude of the investigation region.
The declination angle and the time angle of each grid point in the invention are 23.37 degrees and 0 degrees respectively. The height angle results for each grid point are shown in table 2.
Table 2 height angles corresponding to points
S4, determining the atmospheric transparency coefficient. According to the definition of atmospheric mass, atmospheric correction coefficient, revised atmospheric mass and atmospheric transparency coefficient in the literature 'solar radiation resource calculation based on MATLAB', when the atmospheric mass is calculated, a proper formula is selected to calculate by combining the solar altitude angle solved in the step S2, and then the atmospheric correction coefficient, revised atmospheric mass and atmospheric transparency coefficient are sequentially solved. Wherein the Sichuan province sea elevation is obtained from SRTM3 digital elevation data. The formula is as follows:
(1) When h is more than or equal to 30 degrees, m=1/sin h
(2) When h < 30 °, m= [1229+ (614×sin h) 2 ] 1/2 -614×sin h
P(z)/P 0 ＝[(288-0.0065L)/288] 5.256
m(z，h)＝m×P(z)/P 0
P＝0.56(e -0.56m(z，h) +e -0.096m(z，h) )
Wherein m represents the mass of the atmosphere; h represents the solar altitude; p (z)/P 0 Representing an atmospheric pressure correction coefficient; l represents the altitude of the area under investigation; m (z, h) represents the revised atmospheric mass; p represents the atmospheric transparency coefficient.
As can be seen from the solar altitude obtained in step S3, the altitude of each grid point is greater than 30 °, so that the atmospheric pressure correction coefficient, the revised atmospheric quality and the atmospheric transparency coefficient are sequentially obtained by selecting the atmospheric quality formula in the first case, and the results are shown in table 3.
Table 3 atmospheric mass equivalent for each point
S5, solving direct radiation and scattering according to the known total radiation data. According to the definition of direct incidence and scattering in the literature 'optimal inclination angle research of solar panel placement', direct incidence and scattering data and ratio can be calculated, and direct incidence and scattering values can be respectively calculated by combining the existing data solar total radiation and the atmospheric quality and the atmospheric transparency coefficient solved in the step S3. The formula is as follows:
I DH ＝I 0 ×P m ×sin h
I dH ＝1/2×I 0 ×sin h×(1-P m )/(1-1.4ln P)
I DH +I dH ＝1
R＝I dH /I DH ＝(1-P m )/[2×P m ×(1-1.4ln P)]
wherein I is DH Representing direct radiation; i 0 Representing the solar constant; p represents an atmospheric transparency coefficient; m represents the atmospheric mass; h represents the solar altitude; i dH Representing scattering; i represents total radiation; r represents the ratio between scattering and direct.
First, the ratio of scattering to direct scattering is obtained from the atmospheric mass and the atmospheric transparency coefficient obtained in step S4, and then the direct scattering and the scattering are obtained by combining the total radiation values, respectively, and the results are shown in table 4.
Table 4 direct and scatter values for each point
S6, determining solar radiation received by the inclined plate. According to the definition of the direct radiation quantity ratio of the inclined plane and the horizontal plane and the definition of the radiation quantity of the inclined plane in the literature 'the optimal inclination angle research of the solar panel placement', the optimal inclination angle, the declination angle, the time angle, the scattering and the direct radiation which are solved in the previous step are combined, and the direct radiation quantity ratio of the inclined plane and the horizontal plane and the radiation quantity of the inclined plane are sequentially obtained. The formula is as follows:
I T ＝I DH ×R b +1/2×I dH ×(1+cosβ)+1/2×ρ×I×(1-cosβ)
wherein R is b Representing the ratio of the inclined surface to the direct radiation amount of the horizontal surface; phi represents the institute of researchLatitude at; beta represents an optimal inclination angle; delta represents declination angle; omega represents a time angle; i DH Representing direct radiation; i dH Representing scattering; ρ represents the ground reflectance, typically 0.2.
The ratio of the inclined surface to the horizontal plane direct radiation amount can be calculated by substituting the optimum inclination angle calculated in step S1 and the declination angle and hour angle calculated in step S3 into a formula, and then the inclined surface radiation amount can be calculated by the direct and scattering values calculated in step S5 and the optimum inclination angle calculated in step S1, and the results are shown in table 5.
Table 5 inclined surface radiation amount corresponding to each point
The steps S7, and S8 to S9 that follow are all performed to solve the maximum photovoltaic panel area that can be laid in the investigation region.
S8, determining the minimum occupied area of the single photovoltaic panel. The minimum footprint of an individual photovoltaic panel is solved according to the definition of minimum panel spacing in document "Photovoltaic potential and land-use estimation methodology". The photovoltaic panel is assumed to be 2 meters long and 1 meter wide. The formula is as follows:
d＝l cosβ+(l sinβ)/tan(66，55-Φ)
A＝2×d
wherein d represents a minimum plate pitch; l is the photovoltaic panel width; beta represents an optimal inclination angle; phi represents the latitude of the study area; a represents the minimum footprint of a single panel.
The minimum plate spacing and the minimum floor area of the individual plates can be found from the optimum inclination angle carry-in formula found in step S1, and the results are shown in table 6.
Table 6 minimum plate spacing equivalent for each point
S9, determining the maximum area of the paved plate. According to the conversion of latitude and actual geographic area, the calculation formula of the actual occupied area of the 0.75 degree x 0.75 degree grid and the maximum area of the spreadable photovoltaic panel is as follows:
A r ＝111×0.75×111×0.75×cosΦA a ＝A r /A×2
wherein A is r Representing the geographical area of the actual investigation region, here the actual footprint of a grid; phi represents the latitude of the study area; a is that a The maximum area of the photovoltaic panel can be paved for the actual research area, and the maximum area of the photovoltaic panel can be paved for one grid; a represents the minimum footprint of a single panel.
The maximum area of a grid that can be used to lay photovoltaic panels can be determined from the minimum footprint of the individual panels in step S8, and the results are shown in table 7.
TABLE 7 maximum area of the spreadable photovoltaic panels for each point
And S10, determining the photovoltaic power generation potential under the grid scale. According to the document "Photovoltaic potential and land-use estimation methodology", the formula of the photovoltaic power generation potential is as follows:
E PV ＝η×A a ×I T ×PR×(1-F S )
wherein E is PV Representing the potential of photovoltaic power generation; η is the efficiency of the photovoltaic module; a is that a The maximum area of the photovoltaic panel can be paved for the actual research area, and the maximum area of the photovoltaic panel can be paved for one grid; i T Is the radiation quantity of the inclined plane; PR is the performance ratio, which is the ratio of the final yield of the system to the reference yield; f (F) S Is a shading coefficient.
Based on the maximum area of the spreadable photovoltaic panel determined in step S9 and the inclined surface radiation amount determined in step S6, the present invention further assumes the performance of all photovoltaic systemsThe same, specific parameters are as follows: η=15%, pr=0.8, f S =0.05, whereby the photovoltaic power generation amount corresponding to each grid can be found as shown in table 8.
Table 8 electric quantity production values of square regions centered on grid points
Since the area of a photovoltaic suitable for construction in Sichuan province of 2015 is 7800km2 and the grid point is regarded as the center of a small square of 0.75 degree×0.75 degree, the average value of the geographical area of the square selected with the grid point as the center is 7940.1991km2, the photovoltaic power generation potential value in Sichuan province 2015 can be 7800/7940.1991 × 89.67 = 88.09 (1011 kWh).
Therefore, the photovoltaic power generation potential evaluation method for the inclined plane solar radiation conversion can enable the photovoltaic power generation potential calculation result to be more accurate and conform to reality, the scheme is wide in application range, the effective utilization of solar energy resources can be improved, and theoretical basis can be provided for formulating and implementing the photovoltaic industry policy.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (10)
1. A photovoltaic power generation potential evaluation method for inclined plane solar radiation conversion is characterized by comprising the following steps of: the method comprises the following steps:
s1, determining a formula for calculating the potential of photovoltaic power generation;
s2, determining an optimal inclination angle;
s3, determining a solar altitude;
s4, determining an atmospheric transparency coefficient;
s5, solving direct radiation and scattering according to known total radiation data;
s6, determining the solar radiation quantity of the inclined plane;
s7, determining the minimum occupied area of the single photovoltaic panel;
s8, determining the maximum area of the practical research area where the photovoltaic panel can be paved;
s9, calculating the potential of photovoltaic power generation.
2. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S1, the horizontal radiation amount is corrected to an inclined-plane radiation amount on the basis of a general solution of the photovoltaic power generation potential formula.
3. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S2, the optimal inclination angle of each latitude photovoltaic panel is fitted as a quadratic function, the fitting degree is 0.993, and the optimal inclination angle formula is as follows:
β＝-0.0049Φ 2 +1.0888Φ
where β is the optimal inclination angle Φ is the latitude.
4. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S3, the declination angle, the hour angle and the solar altitude angle of the investigation region are calculated respectively, and the formula is as follows:
δ＝23.45sin[360°(284+n)/365]
ω＝15(t-12)
sin h＝sinΦsinδ+cosΦcosδcosω
wherein δ represents a declination angle; n represents a date number in one year; since the research evaluates that the maximum photovoltaic power generation amount is the highest solar radiation in one year, the corresponding selection of the summer date is used as a time parameter, namely n is 173; omega represents a time angle; t is the time point of 0-24 hours, and 12 is taken because 12 pm is when the solar altitude is maximum and the solar radiation intensity is strongest; h represents the solar altitude; Φ represents the latitude of the investigation region.
5. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S4, when calculating the atmospheric mass, a proper formula is selected for calculation in combination with the solved solar altitude, and the atmospheric correction coefficient, the revised atmospheric mass and the atmospheric transparency coefficient are sequentially obtained, with the following formula:
(1) When h is more than or equal to 30 degrees, m=1/sin h
(2) When h < 30 °, m= [1229+ (614×sin h) 2 ] 1/2 -614×sin h
P(z)/P 0 ＝[(288-0.0065L)/288] 5.256
m(z，h)＝m×P(z)/P 0
P＝0.56(e -0.56m(z，h) +e -0.096m(z，h) )
Wherein m represents the mass of the atmosphere; h represents the solar altitude; p (z)/P 0 Representing an atmospheric pressure correction coefficient; l represents the altitude of the area under investigation; m (z, h) represents the revised atmospheric mass; p represents the atmospheric transparency coefficient.
6. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S5, the direct and scattered values are calculated by combining the direct and scattered ratio, the solar total radiation data, and the calculated atmospheric quality and atmospheric transparency coefficients, respectively, and the formula is as follows:
I DH ＝I 0 ×P m ×sin h
I dH ＝1/2×I 0 ×sin h×(1-P m )/(1-1.4ln P)
I DH +I dH ＝I
R＝I dH /I DH ＝(1-P m )/[2×P m ×(1-1.4ln P)]
wherein I is DH Representing direct radiation; i 0 Representing the solar constant; p represents an atmospheric transparency coefficient; m represents the atmospheric mass; h represents the solar altitude; i dH Representing scattering; i represents total radiation; r represents the ratio between scattering and direct.
7. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S6, the ratio of the inclined surface to the horizontal plane direct radiation amount and the inclined surface radiation amount are sequentially calculated using the calculated optimal inclination angle, declination angle, time angle, scattering and direct radiation, and the formula is as follows:
I T ＝I DH ×R b +1/2×I dH ×(1+cosβ)+1/2×ρ×I×(1-cosβ)
wherein R is b Representing the ratio of the inclined surface to the direct radiation amount of the horizontal surface; phi represents the latitude of the study area; beta represents an optimal inclination angle; delta represents declination angle; omega represents a time angle; i T Indicating the solar radiation quantity on the inclined plane; i DH Representing direct radiation; i dH Representing scattering; ρ represents the ground reflectance, typically 0.2.
8. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S7, the minimum distance between the arrays of the photovoltaic panels is determined based on the solar panel shadow length in winter, and the minimum occupied area of the single photovoltaic panel is solved as follows:
d＝l 1 cosβ+(l 1 sinβ)/tan(66，55-Φ)
A＝l 2 ×d
wherein d represents a minimum plate pitch; l (L) 1 Representation ofA photovoltaic panel width; l (L) 2 Representing the length of the photovoltaic panel; beta represents an optimal inclination angle; phi represents the latitude of the study area; a represents the minimum footprint of a single panel.
9. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S8, the calculation formula is as follows:
A a ＝A r /A×l 1 ×l 2
wherein A is a The maximum area of the photovoltaic panel can be paved for the actual research area; a is that r Representing the geographical area of the actual investigation region; a represents the minimum footprint of a single panel.
10. The method for evaluating the photovoltaic power generation potential of inclined plane solar radiation amount conversion according to claim 1, wherein the method comprises the following steps: in step S9, the calculation formula is as follows:
E PV ＝η×A a ×I T ×PR×(1-F S )
wherein E is PV Representing the potential of photovoltaic power generation; η is the efficiency of the photovoltaic module; a is that a The maximum area of the photovoltaic panel can be paved for the actual research area; i T Is the radiation quantity of the inclined plane; PR is the performance ratio, which is the ratio of the final yield of the system to the reference yield; f (F) S Is a shading coefficient.
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