CN106452301A - Photovoltaic component installation design method for non-due-south slope - Google Patents

Abstract

The invention discloses a photovoltaic module installation design method for non-southern slopes, which belongs to the technical field of solar resource development and utilization, including the determination method of the row direction, longitudinal direction, and bracket inclination angle of the photovoltaic module array, as well as shadow analysis, Spacing design method; first establish a space coordinate system; through on-the-spot measurement, get the direction angle φ _s of the slope s; get the inclination θ _s of the slope s; calculate the unit normal vector of the slope s And the angle γ between the photovoltaic module standing behind the slope surface and the slope surface is used as the design requirement of the inclination angle that the photovoltaic support needs to form, so as to meet the requirements of the target direction angle φ _d and the target inclination angle θ _I of installing the photovoltaic module; at the same time, The invention can analyze the shadow situation generated by the modules to realize the optimal design of the inter-row spacing of the modules; the invention expands the range of mountain site selection, and has a unified support form, which is convenient for on-site installation, and has broad application prospects in the actual design of mountain photovoltaic power stations.

Description

A photovoltaic module installation design method for non-southern slopes

technical field

The invention belongs to the technical field of development and utilization of solar energy resources, and in particular relates to a photovoltaic module installation design method for non-southern slopes

Background technique

With the large-scale development of solar energy resources in my country in recent years, the land resources with sufficient sunshine and flat terrain that can be used for the construction of photovoltaic power plants are decreasing day by day, and the site selection of photovoltaic power plants has gradually extended to complex terrain such as mountains and hills. The terrain of mountain photovoltaic power plants is complex, and the natural slopes have different orientations. The traditional installation and design method of photovoltaic modules for flat land obviously needs to be improved. In order to receive solar radiation to the maximum extent, the modules in large-scale photovoltaic power plants on flat terrain are usually installed in a south-facing, optimal inclination angle, and fixed brackets. In order to improve the land use efficiency of mountainous photovoltaic power plants, some slopes that are not facing south also need to be used. In this case, if photovoltaic modules must be installed facing south, it will be affected by the curvature of the slope in the east-west direction. , after using the traditional fixed bracket to install along the east-west direction, the bottom edge of the module is not parallel to the horizontal plane, but the gradient along the east-west direction has a certain angle with the horizontal plane. So the component plane's normal vector no longer points due south, but has an east-west component. To solve this problem, one type of solution is to use field-adjustable brackets, which are used in Chinese patents CN 203896255 U "A Basic Support System for Hillside Photovoltaic Power Stations" and CN 202495454 U "A Fixed Bracket for Hillside Solar Photovoltaic Power Stations". One way of thinking, although to a certain extent, it can meet the requirements of the optimal inclination angle installation of the module due to the south, but it increases the manufacturing cost of the bracket and the difficulty of differential construction. The second type of solution is to keep the traditional fixed support. The photovoltaic modules are laid along the slope, but they are not strictly in accordance with the east-west direction, but have a certain angle with the east-west direction. For example, Chinese patent CN 103441185 A "a kind of Method and device for installing photovoltaic array". However, at this time, the determination method of the orientation angle and the optimal inclination angle of the photovoltaic module is relatively complicated. Use experimentally determined protocols. Although the radiation receiving effect of the modules under the second scheme is slightly lower than that of the due south installation, it expands the range of mountain site selection, and the support form is uniform, and the on-site installation is convenient. It has broad application prospects in the actual design of mountainous photovoltaic power plants. However, there is no unified design method yet, and there is also a lack of basis for shadow analysis and spacing design.

Contents of the invention

The purpose of the present invention is to propose a photovoltaic module installation design method for non-southern slopes, which is characterized in that it specifically includes the determination method of the row direction, longitudinal direction, and bracket inclination angle of the photovoltaic module array, as well as shadow analysis, spacing Design method, the installation design steps of photovoltaic modules on non-southern slopes are as follows:

1) First establish a spatial coordinate system, where the positive direction of the X-axis is due west, the positive direction of the Y-axis is due south, and X-Y constitutes a horizontal plane; the positive direction of the Z-axis is vertical upward, indicating height; this coordinate system conforms to the north-to-south The convention of left-west-right-east; secondly, define the direction angle φ, that is, the angle between a straight line μ on the X-Y plane and the south direction of the Y axis. Negative direction, that is, the due west direction is 90°, and the due east direction is -90°; define the inclination angle θ, that is, the angle between a certain plane in space and the X-Y plane;

2) Obtain the direction angle φ _s of the slope s through on-the-spot measurement; obtain the inclination θ _s of the slope s; calculate the unit normal vector of the slope s

3) Knowing the target orientation angle φ _d and the target inclination angle θ _d of the photovoltaic module to be installed, calculate the unit normal vector of the module facing the surface d

4) In the slope, the photovoltaic modules are regularly arranged in parallel rows, defining the unit row vector on the slope surface When the bottom edge or bottom horizontal support of each row of photovoltaic modules is along the vector When laying in the determined direction, the requirements of the target direction angle φ _d and target inclination angle θ _d for installing photovoltaic modules are met, and the vector calculation;

5) After the direction of the photovoltaic module is determined, the angle γ between the photovoltaic module support and the slope surface is calculated under the condition that the target direction angle φ _d and the target inclination angle θ _d of the installed photovoltaic module are met. The angle γ is determined by the photovoltaic module Implemented by component brackets;

6) The photovoltaic module stands behind the slope at the angle γ between the photovoltaic module bracket and the slope, and the unit vector of the side of the module The calculation method is as follows:

a. Since the photovoltaic module is rectangular, the side vector perpendicular to the base vector

b. Due to the side vector The PV modules are facing inwards of face d, so perpendicular to

c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors;

7) After the photovoltaic module stands on the slope at an included angle γ, the calculation method of its shadow vector is as follows:

a. According to the known sun altitude angle α and direction angle Φ _r , describe the sun ray unit vector in the coordinate system in Figure 2

In the formula: the negative sign indicates that the vector is sent from the sun and points to the slope;

b. Let the side of the component be the unit vector Then the edge light passing through the uppermost end of the component is irradiated on the slope through the top of the side edge, and the light path between the top of the side edge and the slope is k, which is expressed as a vector Let the shadow vector formed by the photovoltaic module on the slope be The direction is from the bottom end of the side of the photovoltaic module to the end of the shadow; then the side vector of the photovoltaic module Optical path vector shadow vector Form a vector triangle:

Also, since the shadow is on the slope, the shadow vector Necessary and slope normal vector vertical:

Combine the above two equations to obtain the shadow vector

8) Vertical vector of photovoltaic module array The calculation method is as follows:

a. Vertical vector of photovoltaic module array perpendicular to the component row vector

b. Vertical vector of photovoltaic modules is also on the slope s, so the normal vector perpendicular to the slope s

c. Due to the vector perpendicular to and so:

d. Vector Once determined, it can be calculated Direction angle σ on the XY axis plane:

σ＝tan ^-1 (AX _X /AX _Y ), where AX _Y is The component on the Y axis, AX _X is Component on the X axis; determine the installation starting point A1 of a certain row of components on the slope, determine the direction of the horizontal line with the direction angle σ by the horizontal compass, and project the straight line formed on the slope, which is the direction determined by point A1 for The longitudinal installation direction of the photovoltaic module array;

e. The array spacing is the bottom edge of two adjacent rows of photovoltaic module arrays. distance in direction;

9) Components in vertical vector The actual projected length L _AX in the direction is calculated as follows:

Since the unit vector on the side of the photovoltaic module is Therefore, if the actual length of the side of the PV module is L _VL , then in The actual shadow length L _AX in the direction is:

10) The design method of the longitudinal row spacing of the photovoltaic module array is as follows:

a. According to the average solar altitude angle and direction angle data of m hours with sunshine conditions on a special day (usually the winter solstice day), determine the vertical vector of the shadow in sequence according to steps 7-9 Hourly average projection length on where i=1,2,..,m;

b. will each Sort in ascending order to form the sequence Arr;

c. Find the Tth variable in the sequence Arr according to the requirement of the minimum unshaded hours T of the module in a day in the design specification of the photovoltaic power station This value is the minimum value of the spacing between lines to meet the requirement of no occlusion.

the vector The calculation method is as follows:

a. Vector within slope s, so perpendicular to

b. Vector Again in the component facing face d, so perpendicular to

c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors;

d. Vector Once determined, calculate The orientation angle δ on the XY axis plane,

δ=tan ^-1 (SL _X /SL _Y ), where SL _Y is The component on the Y axis, SL _X is component on the x-axis;

e. Determine the installation starting point A1 of a row of photovoltaic modules on the slope, determine the direction of the horizontal line with a direction angle of δ with a horizontal compass, and project the line to the slope, that is, the direction determined by point A1 is The row-wise installation route of the row of photovoltaic module arrays;

The calculation steps of the included angle γ are as follows:

a. Get the normal vector of the slope s

b. Obtain the normal vector of the photovoltaic module facing the face d

c. By the geometric dihedral angle theorem: Among them: the symbol "." is the "quantity product" operation of the geometric vector, and the symbol "||" is the "modulus" operation of the geometric vector;

d. This γ can be used as the design requirement for the inclination angle required by the photovoltaic support;

The beneficial effect of the present invention is that the installation design method is a set of calculation methods for the specific installation parameters of photovoltaic modules, including the determination method of the row direction, longitudinal direction, and bracket inclination angle of the photovoltaic module array, as well as shadow analysis and spacing design methods:

(1) It is possible to calculate important parameters such as the row installation direction, the column installation direction, and the angle required for the bracket required for the installation design of photovoltaic modules on non-southern slopes, so as to accurately achieve the target orientation angle and target of the module. inclination;

(2) The shadow situation generated by the modules can be analyzed to realize the optimal design of the inter-row spacing of the modules; the invention has practical guiding significance for the design and development of mountain photovoltaic power stations.

Description of drawings

Figure 1 is the overall calculation flow chart.

Figure 2 is a schematic diagram of the space coordinate system.

Figure 3 is a schematic diagram of a simple photovoltaic bracket, in which: 1 is the photovoltaic module, 2 is the left bracket, 3 is the left bracket and the ground fixing device, 4 is the right side bracket, 5 is the right side bracket and the ground fixing device, γ is the angle between the photovoltaic module support and the slope.

Fig. 4 is a schematic diagram of a slope photovoltaic array.

detailed description

The present invention proposes a photovoltaic module installation design method for non-southern slopes, which specifically includes the determination method of the horizontal row orientation, vertical column orientation, and bracket inclination angle of the module array, as well as shadow analysis and spacing design methods. The following is combined with the accompanying drawings and Examples illustrate the present invention.

Figure 1 shows the overall calculation flow chart; the following is the installation and design steps of photovoltaic modules on non-southern slopes according to the flow chart:

1) First establish the space coordinate system shown in Figure 2, where the positive direction of the X-axis is due west, the positive direction of the Y-axis is due south, and X-Y constitutes a horizontal plane; the positive direction of the Z-axis is vertical upward, indicating height; this coordinate It conforms to the convention of going up north, down south, left west, right east; defining the direction angle φ, that is, the angle between a straight line on the X-Y plane in Figure 2 and the positive direction of the Y axis (south direction), which is stipulated to be clockwise from the south direction Positive direction, negative direction from south to counterclockwise, that is, due west is 90°, and due east is -90°; define inclination θ, that is, the angle between a certain plane in space and the X-Y plane in Figure 2;

2) Obtain the direction angle φ _s of the slope s through field measurement; obtain the inclination angle θ _s of the slope s through field measurement; calculate the unit normal vector of the slope s

3) Knowing the target orientation angle φ _d and the target inclination angle θ _d of the photovoltaic module to be installed, calculate the unit normal vector of the module facing the surface d

4) Within the slope, the photovoltaic modules are regularly arranged in parallel rows (as shown in Figure 3), defining the unit row vector on the slope surface When the bottom edge or bottom horizontal support of each row of photovoltaic modules is along the vector When laying in the determined direction, it can meet the requirements of the target orientation angle φ _d and the target inclination angle θ _d of the photovoltaic modules to be installed; then the vector The calculation method is as follows:

a. Vector within slope s, so perpendicular to

b. Vector And in the photovoltaic module facing the plane d, so perpendicular to

c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors;

d. Vector Once determined, calculate The orientation angle δ on the XY axis plane,

δ=tan ^-1 (SL _X /SL _Y ), where SL _Y is The component on the Y axis, SL _X is component on the x-axis;

e. Determine the installation starting point A1 of a row of photovoltaic modules on the slope, determine the direction of the horizontal line with a direction angle of δ with a horizontal compass, and project the line to the slope, that is, the direction determined by point A1 is The row-wise installation route of the row of photovoltaic module arrays.

5) After the direction of the photovoltaic module is determined, the angle γ between the photovoltaic module and the slope surface under the condition of satisfying the target direction angle φ _d and the target inclination angle θ _d of the photovoltaic module to be installed is calculated below. This included angle γ is determined by the photovoltaic module The bracket is realized; the calculation steps of the included angle γ are as follows:

a. Get the normal vector of the slope s

b. Get the normal vector of the component facing face d

c. By the geometric dihedral angle theorem: Among them: the symbol "." is the "quantity product" operation of the geometric vector, and the symbol "||" is the "modulus" operation of the geometric vector;

d. This γ can be used as the design requirement for the inclination angle required by the photovoltaic support;

6) After the photovoltaic module stands on the slope at an angle γ, the unit vector of the side of the photovoltaic module The calculation method is as follows:

a. Since the photovoltaic module is rectangular, the side vector perpendicular to the base vector

b. Due to the side vector The PV modules are facing inwards of face d, so perpendicular to

c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors;

7) After the photovoltaic module stands on the slope at an included angle γ, the calculation method of its shadow vector is as follows:

a. According to the known sun altitude angle α and direction angle φ _r , describe the sun ray unit vector in the coordinate system of Figure 2

In the formula: the negative sign indicates that the vector is sent from the sun and points to the slope;

b. Let the side of the photovoltaic module be the unit vector The edge light passing through the uppermost end of the photovoltaic module is irradiated on the slope through the top of the side, and the light path between the top of the side edge and the slope is k, expressed as a vector Let the shadow vector formed by the photovoltaic module on the slope be The direction is from the bottom of the side of the photovoltaic module to the end of the shadow. Then the side vector of the photovoltaic module Optical path vector shadow vector Form a vector triangle:

Also, since the shadow is on the slope, the shadow vector Necessary and slope normal vector vertical:

Combine the above two equations to obtain the shadow vector

8) Vertical vector of photovoltaic module array The calculation method is as follows:

a. Vertical vector of photovoltaic module array perpendicular to the component row vector

b. Vertical vector of photovoltaic modules is also on the slope s, so the normal vector perpendicular to the slope s

c. Due to the vector perpendicular to and so:

d. Vector Once determined, it can be calculated Direction angle σ on the XY axis plane:

σ＝tan ^-1 (AX _X /AX _Y ), where AX _Y is The component on the Y axis, AX _X is Component on the X axis; determine the installation starting point A1 of a certain row of components on the slope, determine the direction of the horizontal line with the direction angle σ by the horizontal compass, and project the straight line formed on the slope, which is the direction determined by point A1 for The longitudinal installation direction of the photovoltaic module array;

e. The array spacing is the bottom edge of two adjacent rows of component arrays. distance in direction;

9) Photovoltaic modules in vertical vector The actual projected length L _AX in the direction is calculated as follows:

Since the unit vector on the side of the photovoltaic module is Therefore, if the actual length of the side of the PV module is L _VL , then in The actual shadow length L _AX in the direction is:

10) The design method of the longitudinal row spacing of the photovoltaic module array is as follows:

a. According to the average solar altitude angle and direction angle data of m hours with sunshine conditions on a special day (usually the winter solstice day), determine the vertical vector of the shadow in sequence according to steps 7-9 Hourly average projection length on where i=1,2,..,m;

b. will each Sort in ascending order to form the sequence Arr;

c. Find the Tth variable in the sequence Arr according to the requirement of the minimum unshaded hours T of the module in a day in the design specification of the photovoltaic power station This value is the minimum value of the spacing between lines to meet the requirement of no occlusion.

Example

In a mountainous photovoltaic power station to be built, the orientation of a certain slope area is 60° south by east, that is, φ _s = -60°; the inclination angle of the slope is 30°, that is, θ _s = 30°; the target orientation of the array is obtained from the previous design The surface is 15° east by south, that is, Φ _d =-15°; the target inclination is 30°, that is, θ _d =30°. The design steps are as follows:

1. First define the spatial coordinate system shown in Figure 2 for the slope to be analyzed.

2. From the normal vector of the slope s

calculated According to the axis definition, this vector points up-south-east.

3. The normal vector from the component towards the face d

calculated According to the axis definition, this vector points up-south-east.

4. Compute the row vector direction for the component array installation:

a. Calculate the vector

b. Calculate Direction angle δ on the XY axis plane:

δ＝tan ^-1 (SL _X /SL _Y )＝-37.50°; Determine the installation starting point of a certain row of components on the slope, use the horizontal compass to determine the direction of the horizontal line with the direction angle of -37.50°, and project it to the slope The straight line formed, that is, the direction determined by the starting point of the installation is The installation route of the component array for this row.

5. Calculate the angle γ between the photovoltaic module support and the slope surface under the condition of satisfying the target orientation angle and target inclination angle. This included angle γ is realized by the photovoltaic module support; γ is calculated as follows:

Figure 3 shows a simple photovoltaic support, where 1 is the photovoltaic module, 2 is the left support, 3 is the left support and the ground fixing device, 4 is the right support, and 5 is the right support and the ground. Fixing device, γ is the bracket angle. Among them, the included angle γ between the photovoltaic module support and the slope is 22.06°. The specific implementation form of the bracket may be different.

6. Unit vector on the side of the component The calculation of:

7. The description of the shadow calculation method is only based on the sun conditions at a certain moment: Assume that the altitude angle of the sunlight at this time is 44.2°, that is, α=44.2°; the sun direction angle is 50° south by east, that is, φ _r =-50°.

a. First calculate the unit direction vector of the sun ray

The vector points in the down-northwest direction;

b. According to the shaded triangle vector equation, calculate:

shadow:

For different sun heights and directions, The calculation method is the same.

8. Vertical vector of component array The calculation of:

a. This vector points down-northeast.

b. Vector Once determined, it can be calculated The direction angle σ on the XY axis plane, σ=tan ^-1 (AX _X /AX _Y )=-132.74°; determine the installation starting point A1 of a row of components on the slope, and use the horizontal angle measuring device to determine the direction angle as -132.74 ° horizontal straight line direction, the straight line formed by projection to the slope surface is the direction determined by A1 point The longitudinal orientation of the array of components mounted.

9. Calculate the projection of the photovoltaic module in the vertical vector at this time The length in the direction, assuming that the actual length of the side of the photovoltaic module is 150cm, then in The actual shadow length L _AX in the direction is:

10. The longitudinal row spacing design method of photovoltaic module array is as follows:

a. According to the average sun altitude and direction angle data of m hours with sunshine conditions on a special day (usually the winter solstice day), determine the average projection length of the shadow on the column vector for each hour according to steps 7-9 where i=1,2,..,m;

b. will each Sort in ascending order to form the sequence Arr;

c. According to the requirements of the photovoltaic power plant design specification for the minimum number of unshaded hours T in a day, for example, T=6, then find the sixth variable in the sequence Arr This value is the minimum value of the spacing between lines to meet the requirement of no occlusion.

Claims (3)

1. A photovoltaic module installation design method for non-southern slopes, characterized in that it specifically includes the determination method of the row direction, longitudinal direction, and support inclination angle of the photovoltaic module array, as well as shadow analysis and spacing design methods. The installation and design steps of photovoltaic modules on south-facing slopes are as follows: 1) First establish a spatial coordinate system, where the positive direction of the X-axis is due west, the positive direction of the Y-axis is due south, and X-Y constitutes a horizontal plane; the positive direction of the Z-axis is vertical upward, indicating height; this coordinate system conforms to the north-to-south The convention of left-west-right-east; secondly, define the direction angle φ, that is, the angle between a straight line μ on the X-Y plane and the south direction of the Y axis. Negative direction, that is, the due west direction is 90°, and the due east direction is -90°; define the inclination angle θ, that is, the angle between a certain plane in space and the X-Y plane; 2) Obtain the direction angle φ _s of the slope s through on-the-spot measurement; obtain the inclination θ _s of the slope s; calculate the unit normal vector of the slope s 3) Knowing the target orientation angle φ _d and the target inclination angle θ _d of the photovoltaic module to be installed, calculate the unit normal vector of the module facing the surface d 4) In the slope, the photovoltaic modules are regularly arranged in parallel rows, defining the unit row vector on the slope surface When the bottom edge or bottom horizontal support of each row of photovoltaic modules is along the vector When laying in the determined direction, the requirements of the target direction angle φ _d and target inclination angle θ _d for installing photovoltaic modules are met, and the vector calculation; 5) After the direction of the photovoltaic module is determined, the angle γ between the photovoltaic module support and the slope surface is calculated under the condition that the target direction angle φ _d and the target inclination angle θ _d of the installed photovoltaic module are met. This angle γ is determined by the photovoltaic module Implemented by component brackets; 6) The photovoltaic module stands behind the slope at the angle γ between the photovoltaic module support and the slope surface, and the unit vector of the side of the photovoltaic module The calculation method is as follows: a. Since the photovoltaic module is rectangular, the side vector perpendicular to the base vector b. Due to the side vector The PV modules are facing inwards of face d, so perpendicular to c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors; 7) The photovoltaic module stands behind the slope at the angle γ between the photovoltaic module support and the slope, and the calculation method of its shadow vector is as follows: a. According to the known sun altitude angle α and direction angle φ _r , describe the sun ray unit vector in the coordinate system of Figure 2 In the formula: the negative sign indicates that the vector is sent from the sun and points to the slope; b. Let the side of the component be the unit vector Then the edge light passing through the uppermost end of the component is irradiated on the slope through the top of the side edge, and the light path between the top of the side edge and the slope is k, which is expressed as a vector Let the shadow vector formed by the photovoltaic module on the slope be The direction is from the bottom end of the side of the photovoltaic module to the end of the shadow; then the side vector of the photovoltaic module Optical path vector shadow vector Form a vector triangle: Also, since the shadow is on the slope, the shadow vector Necessary and slope normal vector vertical: Combine the above two equations to obtain the shadow vector 8) Vertical vector of photovoltaic module array The calculation method is as follows: a. Vertical vector of photovoltaic module array Vertical to the PV module row vector b. Vertical vector of photovoltaic modules is also on the slope s, so the normal vector perpendicular to the slope s c. Due to the vector perpendicular to and so: d. Vector Once determined, it can be calculated Direction angle σ on the XY axis plane: σ＝tan ^-1 (AX _X /AX _Y ), where AX _Y is The component on the Y axis, AX _X is The component on the X-axis; determine the installation starting point A1 of a row of photovoltaic modules on the slope, determine the direction of the horizontal line with the direction angle σ with the horizontal compass, and project the straight line to the slope, which is determined by point A1 Direction is The vertical installation direction of the photovoltaic module array; e. The array spacing is the bottom edge of two adjacent rows of photovoltaic module arrays. distance in direction; 9) Components in vertical vector The actual projected length L _AX in the direction is calculated as follows: Since the unit vector on the side of the photovoltaic module is Therefore, if the actual length of the side of the PV module is L _VL , then in The actual shadow length L _AX in the direction is: 10) The design method of the longitudinal row spacing of the photovoltaic module array is as follows: a. According to the average solar altitude angle and direction angle data of m hours of sunshine conditions on the special date of winter solstice, determine the vertical vector of the shadow in sequence according to steps 7-9 Hourly average projection length on where i=1,2,..,m; b. will each Sort in ascending order to form the sequence Arr; c. Find the Tth variable in the sequence Arr according to the requirement of the minimum unshaded hours T of the module in a day in the design specification of the photovoltaic power station This value is the minimum value of the spacing between lines to meet the requirement of no occlusion. 2. According to claim 1, a photovoltaic module installation design method for non-southern slopes, characterized in that the vector The calculation method is as follows: a. Vector within slope s, so perpendicular to b. Vector Again in the component facing face d, so perpendicular to c. due to perpendicular to and so The symbol "×" is the "cross product" operation of geometric vectors; d. Vector Once determined, calculate The orientation angle δ on the XY axis plane, δ=tan ^-1 (SL _X /SL _Y ), where SL _Y is The component on the Y axis, SL _X is component on the x-axis; e. Determine the installation starting point A1 of a row of photovoltaic modules on the slope, determine the direction of the horizontal line with a direction angle of δ with a horizontal compass, and project the line to the slope, that is, the direction determined by point A1 is The row-wise installation route of the row of photovoltaic module arrays. 3. According to claim 1, a photovoltaic module installation design method for non-south-facing slopes, characterized in that the calculation steps of the angle γ between the photovoltaic module support and the slope are as follows: a. Get the normal vector of the slope s b. Obtain the normal vector of the photovoltaic module facing the face d c. By the geometric dihedral angle theorem: Among them: the symbol "." is the "quantity product" operation of the geometric vector, and the symbol "||" is the "modulo value" operation of the geometric vector; d. This γ is used as the design requirement for the inclination angle that the photovoltaic support needs to form.