CN112688637A - Method and system for determining inclined plane irradiance of photovoltaic panel - Google Patents

Method and system for determining inclined plane irradiance of photovoltaic panel Download PDF

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CN112688637A
CN112688637A CN201910992211.0A CN201910992211A CN112688637A CN 112688637 A CN112688637 A CN 112688637A CN 201910992211 A CN201910992211 A CN 201910992211A CN 112688637 A CN112688637 A CN 112688637A
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photovoltaic panel
irradiance
determining
time
scattering
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姜文玲
王勃
冯双磊
王伟胜
刘纯
赵艳青
王铮
裴岩
车建峰
张菲
汪步惟
王钊
胡菊
靳双龙
宋宗朋
王姝
滑申冰
刘晓琳
张周祥
林毅
项康利
陈国伟
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Fujian Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Fujian Electric Power Co Ltd
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Abstract

The invention relates to a method and a system for determining the inclined plane irradiance of a photovoltaic panel, which comprises the following steps: determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition; respectively determining the direct inclined plane irradiance and the scattered inclined plane irradiance of the photovoltaic panel according to the total horizontal plane irradiance of the photovoltaic panel; and determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel. The technical scheme provided by the invention has the advantages of simple calculation, high precision and wide application range.

Description

Method and system for determining inclined plane irradiance of photovoltaic panel
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a method and a system for determining inclined plane irradiance of a photovoltaic panel.
Background
The most important influence factor of the photovoltaic output is solar irradiance, and generally, the larger the irradiance received by the photovoltaic panel is, the larger the photovoltaic output is. Since the amount of irradiance received by the plane of the photovoltaic panel is related to the angle of incidence of the sun, the irradiance on the horizontal plane and the inclined plane are not equal and often differ significantly.
In order to obtain as much solar radiation energy as possible, the photovoltaic panels are generally mounted with an inclination with the panel facing towards the equator. Irradiance data common in engineering is the total irradiance in the horizontal plane, which needs to be converted into bevel irradiance, a work called irradiance bevel conversion.
In irradiance ramp conversion, for diffuse radiation, conventional methods typically set the solar radiation to be isotropic and convert from horizontal plane irradiance of the photovoltaic panel to ramp irradiance on that basis.
However, researchers find that the scattered radiation mainly comprises molecular scattering and rice scattering, wherein the molecular scattering is typically isotropic, and the rice scattering is mainly forward scattering, that is, the scattering angle is less than 90 °, so that the traditional method has inaccurate setting of the solar radiation, and the calculation result has large errors.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the method for determining the inclined plane irradiance of the photovoltaic panel, which is simple in calculation, high in precision and wide in application range.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a method for determining the inclined plane irradiance of a photovoltaic panel, which is improved in that the method comprises the following steps:
determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
respectively determining the direct inclined plane irradiance and the scattered inclined plane irradiance of the photovoltaic panel according to the total horizontal plane irradiance of the photovoltaic panel;
and determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
Preferably, the determining the photovoltaic panel oblique plane molecular scattering irradiance according to the horizontal plane scattering irradiance of the photovoltaic panel under the headroom condition comprises:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure BDA0002238618570000021
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
Further, before determining the photovoltaic panel oblique molecule scattering irradiance according to the horizontal plane scattering irradiance of the photovoltaic panel under the headroom condition, the method further comprises:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
wherein S iso(t) is determined as follows:
Figure BDA0002238618570000022
in the formula (I), the compound is shown in the specification,
Figure BDA0002238618570000023
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) is the direct transparency coefficient at time t;
τb(t) is determined as follows:
Figure BDA0002238618570000024
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure BDA0002238618570000031
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure BDA0002238618570000032
in which ω (t) is the sun at time tThe time angle is set according to the time of day,
Figure BDA0002238618570000033
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Preferably, the determining of the direct inclined plane irradiance and the diffuse inclined plane meter irradiance of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel comprises:
determining the scattering ratio of the photovoltaic panel at the location according to the horizontal plane total irradiance of the photovoltaic panel;
determining horizontal plane scattering irradiance and horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
determining the inclined surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel;
and determining the direct inclined plane irradiance of the photovoltaic panel according to the direct horizontal plane irradiance of the photovoltaic panel.
Further, the step of determining the scattering ratio of the photovoltaic panel at the location according to the horizontal plane total irradiance of the photovoltaic panel comprises:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure BDA0002238618570000034
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure BDA0002238618570000035
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the solar irradiance on the plane vertical to the sunlight on the upper air boundary at the time t, and theta (t) is the solar zenith angle at the time t.
Further, the determining of the horizontal plane scattering irradiance and the horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel at the location comprises:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the horizontal plane total irradiance of the photovoltaic panel at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
Further, the determining the oblique meter scattering irradiance of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel comprises:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure BDA0002238618570000041
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
Further, the slope solar incident angle θ' (t) of the photovoltaic panel at time t is determined as follows:
θ′(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
the solar azimuth angle α (t) at time t is determined as follows:
Figure BDA0002238618570000042
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees), alpha (t) is the azimuth angle of the sun at the moment t,
Figure BDA0002238618570000043
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Further, the determining the direct inclined plane irradiance of the photovoltaic panel according to the direct horizontal plane irradiance of the photovoltaic panel includes:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure BDA0002238618570000051
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
Preferably, the determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel includes:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S′(t)＝S′b(t)+S′m,d(t)+S′r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
The present invention provides a system for determining bevel irradiance of a photovoltaic panel, the improvement comprising:
the first determination module is used for determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
the second determining module is used for respectively determining the inclined plane direct irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel;
and the third determining module is used for determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
Preferably, the first determining module includes:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure BDA0002238618570000052
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
Further, before the first determining module, the method further includes:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
wherein S iso(t) is determined as follows:
Figure BDA0002238618570000061
in the formula (I), the compound is shown in the specification,
Figure BDA0002238618570000062
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) is the direct transparency coefficient at time t;
τb(t) is determined as follows:
Figure BDA0002238618570000063
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure BDA0002238618570000064
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure BDA0002238618570000065
in the formula, ω (t) is the time angle of the sun at time t,
Figure BDA0002238618570000066
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Preferably, according to the second determination module, the method includes:
the first determining unit is used for determining the scattering ratio of the photovoltaic panel at the position according to the horizontal plane total irradiance of the photovoltaic panel;
the second determining unit is used for determining the horizontal plane scattering irradiance and the horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
the third determining unit is used for determining the inclined surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel;
and the fourth determining unit is used for determining the inclined plane direct irradiance of the photovoltaic panel according to the horizontal plane direct irradiance of the photovoltaic panel.
Further, the first determining unit is configured to:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure BDA0002238618570000071
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure BDA0002238618570000072
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the solar irradiance on the plane vertical to the sunlight on the upper air boundary at the time t, and theta (t) is the solar zenith angle at the time t.
Further, the second determining unit is configured to:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the horizontal plane total irradiance of the photovoltaic panel at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
Further, the third determining unit includes:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure BDA0002238618570000081
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
Further, the slope solar incident angle θ' (t) of the photovoltaic panel at time t is determined as follows:
θ′(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
the solar azimuth angle α (t) at time t is determined as follows:
Figure BDA0002238618570000082
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees), alpha (t) is the azimuth angle of the sun at the moment t,
Figure BDA0002238618570000083
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Further, the fourth determining unit includes:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure BDA0002238618570000084
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
Preferably, the third determining module is configured to:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S′(t)＝S′b(t)+S′m,d(t)+S′r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
Compared with the closest prior art, the invention has the following beneficial effects:
according to the technical scheme provided by the invention, the molecular scattering irradiance of the inclined plane of the photovoltaic panel is determined according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition; respectively determining the direct inclined plane irradiance and the scattered inclined plane irradiance of the photovoltaic panel according to the total horizontal plane irradiance of the photovoltaic panel; determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel; the horizontal plane scattered irradiance of the photovoltaic panel is divided into the horizontal plane molecular scattered irradiance of the photovoltaic panel and the horizontal plane molecular scattered irradiance of the photovoltaic panel, and the horizontal plane molecular scattered irradiance of the photovoltaic panel are respectively converted into the inclined plane irradiance molecular scattered irradiance of the photovoltaic panel and the horizontal plane meter scattered irradiance of the photovoltaic panel, so that the fineness and the accuracy of the irradiance calculation of the photovoltaic panel are improved.
According to the technical scheme provided by the invention, the meter scattering is regarded as superposition of direct incidence and various same-nature scatter according to a certain proportion, and an algorithm for converting horizontal surface meter scattering of the photovoltaic panel into inclined surface meter scattering of the photovoltaic panel is provided on the basis.
Drawings
FIG. 1 is a flow chart of a method of determining bevel irradiance of a photovoltaic panel;
FIG. 2 is a graph of horizontal plane irradiance, actual photovoltaic output, and bevel irradiance of a photovoltaic panel;
FIG. 3 is a schematic illustration of the dependence of photovoltaic panel horizontal irradiance on photovoltaic panel actual photovoltaic output and photovoltaic panel bevel irradiance on photovoltaic panel actual photovoltaic output;
fig. 4 is a block diagram of a system for determining bevel irradiance of a photovoltaic panel.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for determining the inclined plane irradiance of a photovoltaic panel, which comprises the following steps of:
step 101, determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
step 102, respectively determining the inclined plane direct irradiance and the inclined plane meter scattered irradiance of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel;
and 103, determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
In the preferred embodiment of the present invention, after the solar radiation enters the atmosphere, it encounters gas molecules and suspended solid and liquid particles, and part of the radiation changes direction, forming scattered radiation.
Scattering mainly comprises two types: one is molecular scattering (also called rayleigh scattering), which is mainly caused by gas molecules; the other is rice scattering, mainly caused by suspended particles such as dust, cloud droplets, etc.
Among these, molecular scattering is typically isotropic, i.e., the radiation is directed generally uniformly in all directions. Molecular scattering is less affected by weather conditions and its amount is more stable, typically equal to the total amount of scattered radiation in the net irradiance.
Specifically, the step 101 includes:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure BDA0002238618570000101
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
Specifically, before the step 101, the method further includes:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
in the preferred embodiment of the present invention, the irradiance of the upper atmospheric boundary depends mainly on the sun-earth relationship, i.e. the position of the sun as seen from the earth's surface coordinate system, which is generally expressed by the sun zenith and azimuth angles.
Wherein S iso(t) is determined as follows:
Figure BDA0002238618570000102
in the formula (I), the compound is shown in the specification,
Figure BDA0002238618570000103
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) is the direct transparency coefficient at time t;
τb(t) is determined as follows:
Figure BDA0002238618570000111
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure BDA0002238618570000112
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure BDA0002238618570000113
in the formula, ω (t) is the time angle of the sun at time t,
Figure BDA0002238618570000114
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Further, the step 102 includes:
step a, determining the scattering ratio of the position of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel;
b, determining horizontal plane scattering irradiance and horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
c, determining the inclined plane meter scattering irradiance of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel;
and d, determining the direct inclined plane irradiance of the photovoltaic panel according to the horizontal plane direct irradiance of the photovoltaic panel.
Still further, the step a includes:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure BDA0002238618570000115
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure BDA0002238618570000121
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the atmospheric upper bound solar irradiance of the photovoltaic panel at the time t, and theta (t) is the solar zenith angle at the time t.
Still further, the step b includes:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the solar irradiance on the atmospheric upper bound and sunlight vertical plane at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
Still further, the step c includes:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure BDA0002238618570000122
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
In the preferred embodiment of the present invention, the false direct ratio r is the ratio of what is statistically considered to be direct in the meter scattering; 1-r refers to the proportion of the meter scatter statistically considered as scatter.
Due to the fact that weather conditions are complex and variable, the false direct lighting ratio does not have a fixed value, but is a statistical mean value. The user can calculate according to local actual data, and can also adopt an empirical coefficient of 0.7.
Still further, the oblique solar incident angle θ' (t) of the photovoltaic panel at time t is determined as follows:
θ′(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
the solar azimuth angle α (t) at time t is determined as follows:
Figure BDA0002238618570000131
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees), alpha (t) is the azimuth angle of the sun at the moment t,
Figure BDA0002238618570000132
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Still further, the step d includes:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure BDA0002238618570000133
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
Further, the step 103 includes:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S′(t)＝S′b(t)+S′m,d(t)+S′r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
In the best embodiment of the invention, the technical scheme provided by the invention can be applied to the calculation of site selection design, output evaluation, theoretical power, light abandon electric quantity and the like of a photovoltaic power station; the method can also be applied to calculation such as photovoltaic power station power prediction and electric quantity prediction, and has important application value.
By utilizing the technical method provided by the invention, the solar irradiance of the photovoltaic panel can be more accurately obtained, and further, the photovoltaic theoretical power can be more accurately calculated or the photovoltaic power can be more accurately predicted. For example, (a) in fig. 2 shows the horizontal irradiance of the photovoltaic panel at the historical moment, (b) in fig. 2 shows the corresponding output of the photovoltaic panel at the historical moment, and (c) in fig. 2 shows the inclined irradiance of the photovoltaic panel at the historical moment; as can be seen from fig. 2 (a) and fig. 2 (b), the horizontal irradiance of the photovoltaic panel and the inclined plane irradiance of the photovoltaic panel are greatly different from each other, fig. 3 (a) shows the correlation between the horizontal irradiance of the photovoltaic panel and the corresponding output of the photovoltaic panel, fig. 3 (b) shows the correlation between the inclined plane irradiance of the photovoltaic panel and the corresponding output of the photovoltaic panel, and as can be seen from fig. 3 (b) and fig. 3 (a), the correlation between the inclined plane irradiance of the photovoltaic panel and the corresponding output of the photovoltaic panel is stronger than the correlation between the horizontal irradiance of the photovoltaic panel and the corresponding output of the photovoltaic panel.
The invention provides a system for determining the inclined plane irradiance of a photovoltaic panel, as shown in figure 4, the system comprises:
the first determination module is used for determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
the second determining module is used for respectively determining the inclined plane direct irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel;
and the third determining module is used for determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
Specifically, the first determining module includes:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure BDA0002238618570000141
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
Specifically, before the first determining module, the method further includes:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
wherein S iso(t) is determined as follows:
Figure BDA0002238618570000151
in the formula (I), the compound is shown in the specification,
Figure BDA0002238618570000152
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) is the direct transparency coefficient at time t;
τb(t) is determined as follows:
Figure BDA0002238618570000153
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure BDA0002238618570000154
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure BDA0002238618570000155
in the formula, ω (t) is the time angle of the sun at time t,
Figure BDA0002238618570000156
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Further, according to the second determining module, the method includes:
the first determining unit is used for determining the scattering ratio of the photovoltaic panel at the position according to the horizontal plane total irradiance of the photovoltaic panel;
the second determining unit is used for determining the horizontal plane scattering irradiance and the horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
the third determining unit is used for determining the inclined surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel;
and the fourth determining unit is used for determining the inclined plane direct irradiance of the photovoltaic panel according to the horizontal plane direct irradiance of the photovoltaic panel.
Still further, the first determining unit is configured to:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure BDA0002238618570000161
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure BDA0002238618570000162
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the solar irradiance on the plane vertical to the sunlight on the upper air boundary at the time t, and theta (t) is the solar zenith angle at the time t.
Still further, the second determining unit is configured to:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the horizontal plane total irradiance of the photovoltaic panel at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
Still further, the third determining unit includes:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure BDA0002238618570000163
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
Still further, the oblique solar incident angle θ' (t) of the photovoltaic panel at time t is determined as follows:
θ′(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
the solar azimuth angle α (t) at time t is determined as follows:
Figure BDA0002238618570000171
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees), alpha (t) is the azimuth angle of the sun at the moment t,
Figure BDA0002238618570000172
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
Still further, the fourth determining unit includes:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure BDA0002238618570000173
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
Specifically, the third determining module is configured to:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S′(t)＝S′b(t)+S′m,d(t)+S′r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (20)

1. A method of determining bevel irradiance of a photovoltaic panel, the method comprising:
determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
respectively determining the direct inclined plane irradiance and the scattered inclined plane irradiance of the photovoltaic panel according to the total horizontal plane irradiance of the photovoltaic panel;
and determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
2. The method of claim 1, wherein determining the photovoltaic panel oblique molecular scatter irradiance from the photovoltaic panel horizontal scatter irradiance under headroom conditions comprises:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure FDA0002238618560000011
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
3. The method of claim 2, wherein prior to determining the photovoltaic panel oblique molecular scatter irradiance based on the photovoltaic panel horizontal scatter irradiance under headroom conditions, further comprising:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
wherein S iso(t) is determined as follows:
Figure FDA0002238618560000012
in the formula (I), the compound is shown in the specification,
Figure FDA0002238618560000013
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) direct transparency at time tA coefficient;
τb(t) is determined as follows:
Figure FDA0002238618560000021
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure FDA0002238618560000022
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure FDA0002238618560000023
in the formula, ω (t) is the time angle of the sun at time t,
Figure FDA0002238618560000024
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
4. The method of claim 1, wherein determining the sloping direct irradiance and the sloping meter diffuse irradiance of the photovoltaic panel from the total horizontal irradiance of the photovoltaic panel comprises:
determining the scattering ratio of the photovoltaic panel at the location according to the horizontal plane total irradiance of the photovoltaic panel;
determining horizontal plane scattering irradiance and horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
determining the inclined surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel;
and determining the direct inclined plane irradiance of the photovoltaic panel according to the direct horizontal plane irradiance of the photovoltaic panel.
5. The method of claim 4, wherein determining the scattering ratio at the locus of the photovoltaic panel from the horizontal plane total irradiance of the photovoltaic panel comprises:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure FDA0002238618560000025
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure FDA0002238618560000031
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the solar irradiance on the plane vertical to the sunlight on the upper air boundary at the time t, and theta (t) is the solar zenith angle at the time t.
6. The method of claim 4, wherein determining the horizontal scattered irradiance and the horizontal direct irradiance of the photovoltaic panel from the scattering ratio at the location of the photovoltaic panel comprises:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the horizontal plane total irradiance of the photovoltaic panel at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
7. The method of claim 4, wherein determining the bevel meter scatter irradiance of the photovoltaic panel from the horizontal plane scatter irradiance of the photovoltaic panel comprises:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure FDA0002238618560000032
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
8. The method of claim 7, wherein θ' (t) is determined by:
θ'(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
wherein the solar azimuth angle α (t) at time t is determined by:
Figure FDA0002238618560000041
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees),
Figure FDA0002238618560000042
is a photovoltaicAnd the latitude where the plate is located, wherein delta (t) is the solar declination angle where the photovoltaic plate is located at the moment t.
9. The method of claim 4, wherein determining the sloping direct irradiance of the photovoltaic panel from the horizontal plane direct irradiance of the photovoltaic panel comprises:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure FDA0002238618560000043
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
10. The method of claim 1, wherein determining the bevel irradiance of the photovoltaic panel from the bevel direct irradiance, the bevel molecular diffuse irradiance, and the bevel meter diffuse irradiance of the photovoltaic panel comprises:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S'(t)＝S'b(t)+S'm,d(t)+S'r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
11. A system for determining bevel irradiance of a photovoltaic panel, the system comprising:
the first determination module is used for determining the molecular scattering irradiance of the inclined plane of the photovoltaic panel according to the horizontal plane scattering irradiance of the photovoltaic panel under the clearance condition;
the second determining module is used for respectively determining the inclined plane direct irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel according to the horizontal plane total irradiance of the photovoltaic panel;
and the third determining module is used for determining the inclined plane irradiance of the photovoltaic panel according to the inclined plane direct irradiance, the inclined plane molecular scattering irradiance and the inclined plane meter scattering irradiance of the photovoltaic panel.
12. The system of claim 11, wherein the first determination module comprises:
determining the scattering irradiance S 'of the bevel molecules of the photovoltaic panel at the moment t according to the formula'r,d(t)：
Figure FDA0002238618560000051
In the formula, Sr,d(t) the horizontal plane molecule scattering irradiance of the photovoltaic panel at the moment t, and beta is the plate surface inclination angle of the photovoltaic panel;
wherein the horizontal plane molecule scattering irradiance S of the photovoltaic panel at the time t is determined according to the following formular,d(t)：
Sr,d(t)＝Sd,c(t)
In the formula, Sd,cAnd (t) is the horizontal plane scattering irradiance of the photovoltaic panel at the moment t under the clearance condition.
13. The system of claim 12, wherein the first determination module is preceded by:
determining horizontal plane scattering irradiance S of the photovoltaic panel at the t moment under clearance condition according to the following formulad,c(t)：
Sd,c(t)＝So(t)·τd(t)·cosθ(t)
In the formula, So(t) solar irradiance, τ, in a plane perpendicular to sunlight at the upper atmospheric boundary at time td(t) is the scattering transparency coefficient at the moment t, and theta (t) is the solar zenith angle at the moment t;
wherein S iso(t) is determined as follows:
Figure FDA0002238618560000052
in the formula (I), the compound is shown in the specification,
Figure FDA0002238618560000053
is the sun constant, doD (t) is the average distance of the day and the ground, and d (t) is the distance of the day and the ground at the time t;
τd(t) is determined as follows:
τd(t)＝0.271-0.294·τb(t)
in the formula, τb(t) is the direct transparency coefficient at time t;
τb(t) is determined as follows:
Figure FDA0002238618560000054
in the formula, Mh(t) is the relative large air volume at the location of the photovoltaic panel at the time t;
Mh(t) is determined as follows:
Figure FDA0002238618560000061
in the formula, h is the altitude of the photovoltaic panel;
θ (t) is determined as follows:
Figure FDA0002238618560000062
in the formula, ω (t) is the time angle of the sun at time t,
Figure FDA0002238618560000063
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
14. The system of claim 11, wherein according to a second determination module, comprising:
the first determining unit is used for determining the scattering ratio of the photovoltaic panel at the position according to the horizontal plane total irradiance of the photovoltaic panel;
the second determining unit is used for determining the horizontal plane scattering irradiance and the horizontal plane direct irradiance of the photovoltaic panel according to the scattering ratio of the photovoltaic panel;
the third determining unit is used for determining the inclined surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel;
and the fourth determining unit is used for determining the inclined plane direct irradiance of the photovoltaic panel according to the horizontal plane direct irradiance of the photovoltaic panel.
15. The system of claim 14, wherein the first determination unit is to:
and determining the scattering ratio DF of the photovoltaic panel at the position of the t moment according to the following formula:
Figure FDA0002238618560000064
in the formula, kTThe clearance index of the place where the photovoltaic panel is located at the moment t.
Wherein, the clearance index k of the photovoltaic panel at the t moment is determined according to the following formulaT：
Figure FDA0002238618560000065
Wherein S (t) is the total horizontal irradiance of the photovoltaic panel at the time t, SoAnd (t) is the solar irradiance on the plane vertical to the sunlight on the upper air boundary at the time t, and theta (t) is the solar zenith angle at the time t.
16. The system of claim 14, wherein the second determination unit is to:
determining horizontal plane scattering irradiance S of photovoltaic panel at time t according to the following formulad(t)：
Sd(t)＝S(t)·DF
Determining horizontal plane direct irradiance S of photovoltaic panel at time t according to the following formulab(t)：
Sb(t)＝S(t)-Sd(t)
Wherein S (t) is the horizontal plane total irradiance of the photovoltaic panel at the time t, and DF is the scattering ratio of the photovoltaic panel at the time t.
17. The system of claim 14, wherein the third determination unit comprises:
determining the horizontal surface meter scattered irradiance of the photovoltaic panel according to the horizontal surface scattered irradiance of the photovoltaic panel by the following formula:
Sm,d(t)＝Sd(t)-Sr,d(t)；
determining the oblique surface meter scattering irradiance of the photovoltaic panel according to the horizontal surface meter scattering irradiance of the photovoltaic panel by the following formula:
Figure FDA0002238618560000071
in the formula, Sm,d(t) horizontal surface meter scattered irradiance of the photovoltaic panel at time t, Sd(t) horizontal plane scattered irradiance, S, of the photovoltaic panel at time tr,d(t) is the horizontal plane molecule scattering irradiance, S 'of the photovoltaic panel at time t'm,dAnd (t) is the scattering irradiance of the slope meter of the photovoltaic panel at the moment t, r is the false direct incidence ratio of the location of the photovoltaic panel, theta' (t) is the slope solar incident angle of the photovoltaic panel at the moment t, and theta (t) is the solar zenith angle at the moment t.
18. The system of claim 17, wherein the slope solar angle of incidence θ' (t) of the photovoltaic panel at time t is determined as follows:
θ'(t)＝arccos[cosθ(t)×cosβ+sinθ(t)×sinβ×cos(α(t)-ε)]
the solar azimuth angle α (t) at time t is determined as follows:
Figure FDA0002238618560000072
wherein beta is the inclination angle of the surface of the photovoltaic panel, epsilon is the orientation angle of the surface of the photovoltaic panel (when the surface of the photovoltaic panel faces the south, the orientation angle is 180 degrees), alpha (t) is the azimuth angle of the sun at the moment t,
Figure FDA0002238618560000073
and delta (t) is the solar declination angle at the position of the photovoltaic panel at the moment t.
19. The system of claim 14, wherein the fourth determination unit comprises:
determining the direct bevel irradiance S 'of the photovoltaic panel at the moment t according to the formula'b(t)：
Figure FDA0002238618560000081
In the formula, theta' (t) is the inclined plane solar incident angle of the photovoltaic panel at the time t, theta (t) is the solar zenith angle at the time t, SbAnd (t) is the horizontal plane direct irradiance of the photovoltaic panel at the time t.
20. The system of claim 11, wherein the third determination module is to:
determining the bevel irradiance S' (t) of the photovoltaic panel at the time t according to the following formula:
S'(t)＝S'b(t)+S'm,d(t)+S'r,d(t)
of formula (II) S'b(t) is the direct bevel irradiance, S 'of the photovoltaic panel at time t'm,d(t) is the bevel meter scattered irradiance, S 'of the photovoltaic panel at the moment t'r,dAnd (t) is the oblique plane molecular scattering irradiance of the photovoltaic panel at the time t.
CN201910992211.0A 2019-10-18 2019-10-18 Method and system for determining inclined plane irradiance of photovoltaic panel Pending CN112688637A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116026455A (en) * 2023-02-22 2023-04-28 中国科学技术大学 Measurement method of high-precision irradiation sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116026455A (en) * 2023-02-22 2023-04-28 中国科学技术大学 Measurement method of high-precision irradiation sensor

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