CN106295034A

CN106295034A - A kind of high accuracy scattering radiometer calculates method

Info

Publication number: CN106295034A
Application number: CN201610675905.8A
Authority: CN
Inventors: 蔡凡; 蔡一凡; 张臻
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2016-08-15
Filing date: 2016-08-15
Publication date: 2017-01-04
Anticipated expiration: 2036-08-15
Also published as: CN106295034B

Abstract

The invention discloses a high-precision scattered radiation calculation method. Firstly, the solar battery is used to collect the voltage at both ends of the load, and the data of the total irradiance H on the horizontal plane, the total irradiance H _t on the inclined plane, and the scattered irradiance H _d on the horizontal plane are calculated. The direct radiation and scattering calculation models of the existing Hay model are calculated separately to obtain the slant scattering irradiance, and then the linear regression method is used to obtain the relationship between the proportional coefficient of the difference between the two and time, that is, the correction coefficient of the scattered radiation of the Hay model, thereby correcting the Hay model Scattering calculation model, obtain a high-precision scattering radiation calculation model. The scattered radiation calculation method can accurately calculate the scattered irradiance, and provide accurate radiation data for the photovoltaic tracking system, the calculation of the optimal inclination angle, and the concentrating system.

Description

A Calculation Method of High Precision Scattered Radiation

技术领域technical field

本发明涉及一种高精度散射辐射计算方法，属于光伏系统技术领域。The invention relates to a high-precision scattered radiation calculation method, which belongs to the technical field of photovoltaic systems.

背景技术Background technique

随着不可再生能源的日益枯竭，水能、风能、太阳能等可再生能源备受关注，而太阳能取之不尽、用之不竭，使其备受利用。太阳能热利用例如蝶式、槽式太阳能、光伏发电系统例如光伏跟踪系统、最佳倾角计算、聚光系统都需要以精准的太阳辐照数据(特别是直射数据)为基础。而现在使用广泛的第二类各向异性散射辐射模型是在各向同性模型的基础上，针对天气及太阳高度角进行修正的各向异性散射辐射模型，该模型计算简单方便，具有一定的使用价值。但该模型从各向同性修正而来，物理意义不明确，精度不高，物理定义不明确，精度不高，因此需对选定模型进行不同天气类型下的修正。With the increasing depletion of non-renewable energy sources, renewable energy sources such as water energy, wind energy, and solar energy have attracted much attention, and solar energy is inexhaustible and inexhaustible, making it widely used. Solar thermal utilization such as butterfly and trough solar energy, photovoltaic power generation systems such as photovoltaic tracking systems, optimal inclination calculations, and concentrating systems all need to be based on accurate solar radiation data (especially direct sunlight data). The second type of anisotropic scattered radiation model that is widely used now is an anisotropic scattered radiation model that is corrected for weather and solar altitude angles on the basis of the isotropic model. This model is simple and convenient to calculate and has a certain application value. However, the model is corrected from isotropy, the physical meaning is not clear, the precision is not high, the physical definition is not clear, and the precision is not high, so the selected model needs to be corrected under different weather types.

发明内容Contents of the invention

本发明提供一种高精度散射辐射计算模型，解决现有散射辐射计算模型误差较大问题，从而精准预测发电量。The invention provides a high-precision scatter radiation calculation model, which solves the problem of large errors in the existing scatter radiation calculation model, thereby accurately predicting power generation.

为解决上述技术问题，本发明采用的技术方案如下：In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

一种高精度散射辐射计算方法，包括以下步骤：A high-precision scattered radiation calculation method, comprising the following steps:

(1)采集辐照数据；(1) Collect radiation data;

(2)计算散射辐射修正系数；(2) Calculate the scattered radiation correction coefficient;

(3)计算得到修正后的散射辐照度。(3) Calculate the corrected scattered irradiance.

前述的采用三块太阳电池做辐照传感器，一块水平放置、一块倾角放置、一块水平放置并在太阳直接照射的方向上加遮光片，根据基于太阳电池外接负载两端电压计算辐照度的非线性模型计算对应的水平面总辐照度H、斜面总辐照度H_t、水平面的散射辐照度H_d，计算公式如下：The aforementioned three solar cells are used as radiation sensors, one is placed horizontally, the other is placed at an inclination angle, and the other is placed horizontally and a shading sheet is added in the direction directly irradiated by the sun. The linear model calculates the corresponding total irradiance H on the horizontal plane, total irradiance H _t on the inclined plane, and diffuse irradiance H _d on the horizontal plane. The calculation formula is as follows:

${H h}^{i i} = = \frac{0.07 0.07 {U u}_{i i} - - 2.75 2.75 \times \times 1010^{- - 1212} (({e e}^{\frac{308.99 308.99 {U u}_{i i}}{T T}} - - 11)) \times \times 1010^{44}}{0.0646 0.0646 \times \times {U u}_{i i}^{66} - - 0.513 0.513 \times \times {U u}_{i i}^{55} + + 1.514 1.514 \times \times {U u}_{i i}^{44} - - 2.078 2.078 \times \times {U u}_{i i}^{33} + + 1.626 1.626 \times \times {U u}_{i i}^{22} - - 0.668 0.668 \times \times {U u}_{i i} + + 1.352 1.352},, i i = = 11,, 22,, 33 - - - - - - ((11))$

其中，当i＝1时，U₁为水平放置的太阳电池外接负载两端电压，H¹对应水平面总辐照度H，当i＝2时，U₂为倾角放置的太阳电池外接负载两端电压，H²对应斜面总辐照度H_t，当i＝3时，U₃为水平放置并在太阳直接照射的方向上加遮光片的太阳电池外接负载两端电压，H³对应水平面的散射辐照度H_d。Among them, when i=1, U ₁ is the voltage across the external load of the solar cell placed horizontally, H ¹ corresponds to the total irradiance H on the horizontal plane, and when i=2, U ₂ is the voltage across the external load of the solar cell placed at an inclination angle Voltage, H ² corresponds to the total irradiance H _t of the inclined plane, when i=3, U ₃ is the voltage across the external load of the solar cell placed horizontally and with a shading sheet in the direction directly irradiated by the sun, H ³ corresponds to the scattering of the horizontal plane Irradiance H _d .

前述的计算散射辐射修正系数，包括以下步骤：The aforementioned calculation of the correction factor for scattered radiation includes the following steps:

(2-1)根据散射模型计算斜面的散射辐照度；(2-1) Calculate the scattering irradiance of the slope according to the scattering model;

所述散射模型为：斜面的散射辐照度由太阳所在光盘发散出的散射辐照度与周围天空穹顶均匀分布的散射辐照度组成：The scattering model is: the scattering irradiance of the inclined plane is composed of the scattering irradiance emanating from the optical disk where the sun is located and the uniformly distributed scattering irradiance of the surrounding sky dome:

${H h}_{d d t t} = = {H h}_{d d} [[\frac{{H h}_{b b}}{{H h}_{00}} {R R}_{b b} + + \frac{11}{22} ((11 - - \frac{{H h}_{b b}}{{H h}_{00}})) ((11 + + cos cos s the s))]] - - - - - - ((33))$

其中，H_dt为散射模型中斜面的散射福照度，s为斜面的倾角；Among them, H _dt is the scattering illuminance of the inclined plane in the scattering model, and s is the inclination angle of the inclined plane;

H_b满足： _Hb satisfies:

H＝H_d+H_b (2)H＝H _d +H _b (2)

其中，H_b为水平面的直射辐照度，H_d为水平面的散射辐照度；Among them, H _b is the direct irradiance of the horizontal plane, and H _d is the diffuse irradiance of the horizontal plane;

H₀为大气层上界水平方向上的太阳总辐照度：H ₀ is the total solar irradiance in the horizontal direction of the upper boundary of the atmosphere:

其中，α_s为太阳高度角，n为当日所在一年中的天数；Among them, α _s is the solar altitude angle, and n is the number of days in a year where the current day is located;

R_b为斜面与水平面上直射辐照度之比：R _b is the ratio of direct irradiance on the inclined plane to the horizontal plane:

${R R}_{b b} = = \frac{c c o o s the s θ θ}{{cosθ cosθ}_{Z Z}} - - - - - - ((55))$

其中，θ_Z为天顶角，θ为太阳入射角；Among them, θ _Z is the zenith angle, θ is the sun incidence angle;

则，由散射模型计算斜面的散射辐照度为：Then, the scattering irradiance of the inclined plane calculated by the scattering model is:

${H h}_{d d t t} = = {H h}_{d d} [[\frac{H h - - {H h}_{d d}}{{H h}_{00}} (({R R}_{b b} - - \frac{11 + + cos cos s the s}{22})) + + \frac{11 + + cos cos s the s}{22}]] - - - - - - ((66));;$

(2-2)根据直射模型计算斜面的散射辐照度；(2-2) Calculate the diffuse irradiance of the inclined plane according to the direct radiation model;

所述直射模型为：倾斜的太阳电池接收到的总辐照度等于散射辐照度与直射辐照度之和，则斜面的散射辐照度为：The direct radiation model is: the total irradiance received by the inclined solar cell is equal to the sum of the diffuse irradiance and the direct irradiance, then the diffuse irradiance of the slope is:

H′_dt＝H_t-H_bt (8)H′ _dt ＝H _t -H _bt (8)

其中，H′_dt为直射模型中斜面的散射福照度，H_bt为斜面的直射辐照度；Among them, H′ _dt is the diffuse irradiance of the inclined plane in the direct radiation model, and H _bt is the direct irradiance of the inclined plane;

由于太阳的直射辐照度与太阳电池的角度有关，故：Since the direct irradiance of the sun is related to the angle of the solar cell, so:

H_bt＝H_b×R_b (7)H _bt =H _b ×R _b (7)

则，but,

H′_dt＝H_t-(H-H_d)×R_b (9)；H' _dt =H _t -(HH _d )×R _b (9);

(2-3)计算散射辐射修正系数，定义散射模型中斜面的散射福照度和直射模型中斜面的散射福照度的差值比例系数为散射辐射修正系数ΔH_dt：(2-3) Calculating the correction coefficient of diffuse radiation, defining the difference proportional coefficient between the diffuse illuminance of the inclined plane in the scattering model and the diffuse illumination of the inclined plane in the direct model as the diffuse radiation correction coefficient ΔH _dt :

${ΔH ΔH}_{d d t t} = = \frac{{H h}_{d d t t}^{,,} - - {H h}_{d d t t}}{{H h}_{d d t t}} - - - - - - ((1010));;$

(2-4)通过线性回归的方法建立散射辐射修正系数和时间之间的函数关系，具体如下：(2-4) Establish the functional relationship between the scattered radiation correction coefficient and time by linear regression method, as follows:

假定不同天气下散射辐射修正系数ΔH_dt与时间t呈六次函数关系：It is assumed that the diffuse radiation correction coefficient ΔH _dt has a sextic function relationship with time t under different weather conditions:

ΔH_dt＝b₁t⁶+b₂t⁵+b₃t⁴+b₄t³+b₅t²+b₆t+b₇ (11)ΔH _dt =b ₁ t ⁶ +b ₂ t ⁵ +b ₃ t ⁴ +b ₄ t ³ +b ₅ t ² +b ₆ t+b ₇ (11)

其中，系数b₁—b₇为未知数，Among them, the coefficients b ₁ -b ₇ are unknowns,

然后通过线性回归的方法代入不同天气的数据计算得到公式(11)中的系数b₁—b₇，进而得到散射辐射修正系数和时间之间的函数关系。Then, the coefficients b ₁ —b ₇ in formula (11) are calculated by substituting the data of different weathers by linear regression method, and then the functional relationship between the scattered radiation correction coefficient and time is obtained.

前述的修正后的散射辐照度为：The aforementioned corrected scattered irradiance is:

H_dt-修正＝(ΔH_dt+1)H_dt (12)H _{dt-correction} = (ΔH _dt +1)H _dt (12)

其中，H_dt-修正为修正后的斜面的散射辐照度，H_d-修正为修正后的水平面的散射辐照度。Among them, H _{dt-correction} is the corrected diffuse irradiance on the inclined plane, and H _d-correction is the corrected diffuse irradiance on the horizontal plane.

本发明的散射辐射计算方法可精准计算出散射辐照度，为光伏跟踪系统、最佳倾角计算、聚光系统提供准确的辐照数据。The scattered radiation calculation method of the present invention can accurately calculate the scattered irradiance, and provide accurate radiation data for the photovoltaic tracking system, the calculation of the optimal inclination angle, and the concentrating system.

附图说明Description of drawings

图1为本发明的高精度散射辐射计算流程图；Fig. 1 is the high-precision scattered radiation calculation flowchart of the present invention;

图2为太阳电池；Figure 2 is a solar cell;

图3为不同天气下散射辐射修正系数与时间的关系图；Figure 3 is a graph of the relationship between the correction coefficient of diffuse radiation and time under different weather conditions;

图4为太阳电池辐照测量仪。Figure 4 is a solar cell radiation measuring instrument.

具体实施方式detailed description

下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

如图1所示，本发明方法首先利用太阳电池采集负载两端电压，并计算水平面总辐照度H、斜面总辐照度H_t、水平面散射辐照度H_d数据，利用现有Hay模型的直射、散射计算模型分别计算获得斜面散射辐照度H_dt，随后利用线性回归方法计算获得Hay模型散射辐射修正系数，从而修正Hay模型散射计算模型，具体计算流程如下：As shown in Figure 1, the method of the present invention first uses the solar cell to collect the voltage at both ends of the load, and calculates the data of the total irradiance H on the horizontal plane, the total irradiance H _t on the inclined plane, and the scattered irradiance H _d on the horizontal plane, using the existing Hay model The calculation model of the direct radiation and the scattering calculation model is calculated separately to obtain the slope scattering irradiance H _dt , and then the linear regression method is used to calculate the scattered radiation correction coefficient of the Hay model, so as to correct the scattering calculation model of the Hay model. The specific calculation process is as follows:

1.辐照数据采集1. Irradiation data collection

采用三块如图2所示的太阳电池做辐照传感器，一块水平放置、一块倾角放置、一块水平放置并在太阳直接照射的方向上加遮光片。太阳电池接收太阳辐射后产生光生电流，电流流经回路中的电阻，使其两端产生电势差，根据基于电池外接负载两端电压计算辐照度的非线性模型计算对应的水平面总辐照度H、斜面总辐照度H_t、水平面的散射辐照度H_d数据，计算公式如下：Three solar cells as shown in Figure 2 are used as radiation sensors, one is placed horizontally, the other is placed at an angle, and the other is placed horizontally with a shading film in the direction of direct sunlight. The solar cell generates photo-generated current after receiving solar radiation, and the current flows through the resistance in the loop, causing a potential difference at both ends, and calculates the corresponding horizontal total irradiance H based on the nonlinear model of calculating irradiance based on the voltage at both ends of the battery external load , the total irradiance H _t on the inclined plane, and the diffuse irradiance H _d data on the horizontal plane, the calculation formula is as follows:

2.散射辐射修正系数计算2. Calculation of scattered radiation correction coefficient

2-1)散射模型计算斜面散射辐照度2-1) Scattering model to calculate slope scattering irradiance

为了增强硅电池对太阳光的吸收，提高电池的性能，往往在硅电池表面做绒面处理，有效的绒面结构使可见光在电池表面多次折射、反射，大大降低硅电池表面对太阳辐射的反射，因此到达电池表面的总辐照度近似等于散射辐照度与直射辐照度之和：In order to enhance the absorption of sunlight by the silicon battery and improve the performance of the battery, the surface of the silicon battery is often treated with suede. The effective suede structure makes visible light refracted and reflected on the surface of the battery multiple times, greatly reducing the solar radiation on the surface of the silicon battery. reflection, so the total irradiance reaching the cell surface is approximately equal to the sum of the diffuse irradiance and the direct irradiance:

H＝H_d+H_b (2)H＝H _d +H _b (2)

式中，H_b为水平面的直射辐照度，H_d为水平面的散射辐照度。In the formula, H _b is the direct irradiance of the horizontal plane, and H _d is the diffuse irradiance of the horizontal plane.

本发明设计的辐照计的散射计算模型采用基于各向同性修正得到Hay模型，即倾斜面上方的散射辐照度由太阳所在光盘发散出的散射辐照度与周围天空穹顶均匀分布的散射辐照度组成：The scattering calculation model of the radiometer designed in the present invention adopts the Hay model based on isotropy correction, that is, the scattered irradiance above the inclined surface is the scattered irradiance emitted by the disc where the sun is located and the scattered irradiance evenly distributed by the surrounding sky dome. Illumination composition:

式中，H_dt为散射模型的斜面散射福照度，s为斜面的倾角，In the formula, H _dt is the slope scattering illuminance of the scattering model, s is the slope angle of the slope,

式中，α_s为太阳高度角，n为当日所在一年中的天数；In the formula, α _s is the altitude angle of the sun, and n is the number of days in a year where the current day is located;

R_b为倾斜面与水平面上直射辐射度之比：R _b is the ratio of direct radiation on the inclined plane to the horizontal plane:

式中，θ_Z为天顶角，θ为太阳入射角。In the formula, θ _Z is the zenith angle, and θ is the incident angle of the sun.

则由散射模型计算斜面散射辐照度为：Then the slope scattering irradiance calculated by the scattering model is:

${H h}_{d d t t} = = {H h}_{d d} [[\frac{H h - - {H h}_{d d}}{{H h}_{00}} (({R R}_{b b} - - \frac{11 + + cos cos s the s}{22})) + + \frac{11 + + cos cos s the s}{22}]] - - - - - - ((66))$

2-2)直射模型计算斜面散射辐照度2-2) Calculate the slant scattering irradiance with the direct model

H_bt＝H_b×R_b (7)H _bt =H _b ×R _b (7)

倾斜的太阳电池接收到的总辐照度近似等于散射辐照度与直射辐照度之和，则直射模型的斜面散射辐照度为：The total irradiance received by the inclined solar cell is approximately equal to the sum of the diffuse irradiance and the direct irradiance, then the slope diffuse irradiance of the direct model is:

H′_dt＝H_t-H_bt (8)H′ _dt ＝H _t -H _bt (8)

H_bt为倾斜面的直射辐照度，H_dt为散射模型的斜面散射福照度。H _bt is the direct irradiance of the inclined plane, and H _dt is the diffuse irradiance of the inclined plane of the scattering model.

则由直射模型计算斜面散射辐照度为：Then the oblique scattering irradiance calculated by the direct radiation model is:

H′_dt＝H_t-(H-H_d)×R_b (9)H′ _dt ＝H _t -(HH _d )×R _b (9)

H′_dt为直射模型的斜面散射福照度。 _H'dt is the oblique scattering illuminance of the direct model.

2-3)散射辐射修正系数2-3) Scattered radiation correction factor

由上述两种方法计算获得斜面散射辐照度，求得两者的差值比例系数即为散射辐射修正系数：The slant scattered irradiance is calculated by the above two methods, and the proportional coefficient of the difference between the two is obtained as the scattered radiation correction coefficient:

${ΔH ΔH}_{d d t t} = = \frac{{H h}_{d d t t}^{,,} - - {H h}_{d d t t}}{{H h}_{d d t t}} - - - - - - ((1010))$

对不同天气下的辐照数据进行上述的处理，则散射辐射修正系数ΔH_dt与时间t的关系如图3所示。The above-mentioned processing is performed on the irradiation data under different weathers, and the relationship between the diffuse radiation correction coefficient ΔH _dt and time t is shown in Fig. 3 .

从图3中可以看出，ΔH_dt与t之间存在一定的关系，且不同天气下关系不同，由于ΔH_dt值相对较小，为了保证精度，这里假定不同天气下ΔH_dt与t呈六次函数关系：It can be seen from Figure 3 that there is a certain relationship between ΔH _dt and t, and the relationship is different under different weather conditions. Since the value of ΔH _dt is relatively small, in order to ensure accuracy, it is assumed that ΔH _dt and t are six times under different weather conditions Functional relationship:

式中，b₁—b₇为未知数，这里通过线性回归的方法代入不同天气的数据计算得公式中的系数如表1所示。In the formula, b ₁ —b ₇ are unknowns, and the coefficients in the formula are calculated by substituting the data of different weathers by the method of linear regression, as shown in Table 1.

表1 公式(10)中系数(×10³)Table 1 Coefficients in formula (10) (×10 ³ )

3.高精度散射辐射计算3. High-precision scattered radiation calculation

一般的，以太阳电池为传感器的辐照测量仪如图4所示，它由水平太阳电池、斜面太阳电池接收太阳辐射后转换为水平的总辐照度、斜面的总辐照度，通过Hay模型计算获得散射辐照度，因模型在计算散射辐射方面误差过大，因此对Hay模型计算获得的散射辐射度进行修正，假设由模型计算获得的斜面散射辐照度为H_dt，则修正后的散射辐照度为：Generally, the irradiance measuring instrument with solar cells as sensors is shown in Figure 4. It is converted into horizontal total irradiance and slope total irradiance after receiving solar radiation by horizontal solar cells and slope solar cells. Through Hay The scattered irradiance obtained by the model calculation, because the model has too large error in calculating the scattered radiation, so the scattered irradiance obtained by the Hay model calculation is corrected, assuming that the slope scattered irradiance obtained by the model calculation is H _dt , then after correction The diffuse irradiance of is:

H_dt-修正＝(ΔH_dt+1)H_dt (12)H _{dt-correction} = (ΔH _dt +1)H _dt (12)

式中，H_dt-修正为修正后的斜面散射辐照度，H_d-修正为修正后的水平面散射辐照度。In the formula, H _{dt-correction} is the corrected slope scatter irradiance, and H _d-correction is the corrected horizontal surface scatter irradiance.

以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims

1. A high-precision scattered radiation calculation method is characterized in that, comprising the following steps:

(1) Collect radiation data;

(2) Calculate the scattered radiation correction coefficient;

(3) Calculate the corrected scattered irradiance.

2. A kind of high-precision scattered radiation calculation method according to claim 1, characterized in that three solar cells are used as radiation sensors, one is placed horizontally, one is placed at an inclination angle, and one is placed horizontally in the direction of direct sunlight Add a shading sheet, and calculate the corresponding horizontal total irradiance H, inclined plane total irradiance H _t , and horizontal plane diffuse irradiance H _d according to the nonlinear model for calculating irradiance based on the voltage at both ends of the external load of the solar cell. The formula is as follows:

{H h}^{i i} = = \frac{0.07 0.07 {U u}_{i i} - - 2.75 2.75 \times \times 1010^{- - 1212} (({e e}^{\frac{308.99 308.99 {U u}_{i i}}{T T}} - - 11)) \times \times 1010^{44}}{0.0646 0.0646 \times \times {U u}_{i i}^{66} - - 0.513 0.513 \times \times {U u}_{i i}^{55} + + 1.514 1.514 \times \times {U u}_{i i}^{44} - - 2.078 2.078 \times \times {U u}_{i i}^{22} + + 1.626 1.626 \times \times {U u}_{i i}^{22} - - 0.668 0.668 \times \times {U u}_{i i} + + 1.352 1.352},, i i = = 11,, 22,, 33 - - - - - - ((11))

Among them, when i=1, U ₁ is the voltage across the external load of the solar cell placed horizontally, H ¹ corresponds to the total irradiance H on the horizontal plane, and when i=2, U ₂ is the voltage across the external load of the solar cell placed at an inclination angle Voltage, H ² corresponds to the total irradiance H _t of the inclined plane, when i=3, U ₃ is the voltage across the external load of the solar cell placed horizontally and with a shading sheet in the direction directly irradiated by the sun, H ³ corresponds to the scattering of the horizontal plane Irradiance H _d .

3. A kind of high-precision scattered radiation calculation method according to claim 2, characterized in that said calculation of the scattered radiation correction coefficient comprises the following steps:

(2-1) Calculate the scattering irradiance of the slope according to the scattering model;

The scattering model is: the scattering irradiance of the inclined plane is composed of the scattering irradiance emanating from the optical disc where the sun is located and the uniformly distributed scattering irradiance of the surrounding sky dome:

{H h}_{d d t t} = = {H h}_{d d} [[\frac{{H h}_{b b}}{{H h}_{00}} {R R}_{b b} + + \frac{11}{22} ((11 - - \frac{{H h}_{b b}}{{H h}_{00}})) ((11 + + cos cos s the s))]] - - - - - - ((33))

Among them, H _dt is the scattering illuminance of the inclined plane in the scattering model, and s is the inclination angle of the inclined plane;

_Hb satisfies:

H＝H _d +H _b (2)

Among them, H _b is the direct irradiance of the horizontal plane, and H _d is the diffuse irradiance of the horizontal plane;

H ₀ is the total solar irradiance in the horizontal direction of the upper boundary of the atmosphere:

Among them, α _s is the solar altitude angle, and n is the number of days in a year where the current day is located;

R _b is the ratio of direct irradiance on the inclined plane to the horizontal plane:

{R R}_{b b} = = \frac{c c o o s the s θ θ}{{cosθ cosθ}_{Z Z}} - - - - - - ((55))

Among them, θ _Z is the zenith angle, θ is the sun incidence angle;

Then, the scattering irradiance of the inclined plane calculated by the scattering model is:

{H h}_{d d t t} = = {H h}_{d d} [[\frac{H h - - {H h}_{d d}}{{H h}_{00}} (({R R}_{b b} - - \frac{11 + + cos cos s the s}{22})) + + \frac{11 + + cos cos s the s}{22}]] - - - - - - ((66));;

(2-2) Calculate the diffuse irradiance of the inclined plane according to the direct radiation model;

The direct radiation model is: the total irradiance received by the inclined solar cell is equal to the sum of the diffuse irradiance and the direct radiation, then the diffuse irradiance of the slope is:

H′ _dt ＝H _t -H _bt (8)

Among them, H′ _dt is the diffuse irradiance of the inclined plane in the direct radiation model, and H _bt is the direct irradiance of the inclined plane;

Since the direct irradiance of the sun is related to the angle of the solar cell, so:

H _bt =H _b ×R _b (7)

but,

H' _dt =H _t -(HH _d )×R _b (9);

(2-3) Calculating the correction coefficient of diffuse radiation, defining the difference proportional coefficient between the diffuse illuminance of the inclined plane in the scattering model and the diffuse illumination of the inclined plane in the direct model as the diffuse radiation correction coefficient ΔH _dt :

{ΔH ΔH}_{d d t t} = = \frac{{H h}_{d d t t}^{,,} - - {H h}_{d d t t}}{{H h}_{d d t t}} - - - - - - ((1010));;

(2-4) Establish the functional relationship between the scattered radiation correction coefficient and time by linear regression method, as follows:

It is assumed that the diffuse radiation correction coefficient ΔH _dt has a sextic function relationship with time t under different weather conditions:

ΔH _dt =b ₁ t ⁶ +b ₂ t ⁵ +b ₃ t ⁴ +b ₄ t ³ +b ₅ t ² +b ₆ t+b ₇ (11)

Among them, the coefficients b ₁ -b ₇ are unknowns,

Then, the coefficients b ₁ —b ₇ in formula (11) are calculated by substituting the data of different weathers by linear regression method, and then the functional relationship between the scattered radiation correction coefficient and time is obtained.

4. A kind of high-precision scattered radiation calculation method according to claim 3, characterized in that, the corrected scattered irradiance is:

H _{dt-correction} = (ΔH _dt +1)H _dt (12)

Among them, H _{dt-correction} is the corrected diffuse irradiance on the inclined plane, and H _d-correction is the corrected diffuse irradiance on the horizontal plane.