JP5981325B2 - Solar power system - Google Patents

Description

  The present invention relates to a photovoltaic power generation system.

  With the recent trend of environmental protection, construction of a photovoltaic power generation system in which a plurality of solar cell arrays are integrated and installed on a large scale is underway. A solar power generation system having an output of 1000 kW or more is called a mega solar. In order to increase the power generation amount of the mega solar, it is effective to increase the power generation amount of each solar cell module constituting the solar cell array. As one form of the solar cell module in which the amount of power generation is increased, there is a double-sided light receiving solar cell module that can generate power by the incidence of light from both the front and back sides.

  Here, among the plurality of solar cell arrays, one of the solar cell arrays is arranged at a certain interval so that the other adjacent solar cell array is not shaded. The distance between the adjacent solar cell arrays is set so as not to be shaded from each other on the basis of the southern and middle altitudes of the winter solstice. On the other hand, during the summer solstice, direct sunlight is more likely to hit the installation surface such as the ground between the solar cell arrays, and thus light loss occurs.

  Therefore, in order to increase the power generation amount of the solar power generation system, there is a technology that increases the power generation amount by regularly reflecting sunlight incident on the periphery of the solar cell array toward the back surface of the double-sided light receiving solar cell module by a reflecting member. (For example, refer to Patent Document 1).

JP-A-11-330523

  However, in the technique of Patent Document 1, the height of the solar cell array is such that the entire back surface of the double-sided light receiving solar cell module is regularly reflected so that the incident angle and the reflection angle of sunlight are equal. In some cases, it becomes too high and the number of man-hours and materials used increase. Moreover, in the said technique, since arrangement | positioning of a reflection member was not fully examined, possibility that the light reflected several times instead of 1st reflection will inject into the back surface of a solar cell module is high.

  One object of the present invention is to provide a photovoltaic power generation system in which the amount of power generation is increased by efficiently causing reflected light to enter the back surface of the solar cell module.

Solar power generation system according to Ichikatachi state of the present invention, the installation at an angle θ (°) (θ <90 ° -γ) against a plane parallel to the installation surface having an angle gamma (°) with respect to the horizontal plane A plurality of solar cell modules of a double-sided light receiving type arranged away from the surface, and arranged on the installation surface, the first solar cell array and the second solar cell array installed side by side in one direction; The length of the surface of the first solar cell array and the surface of the second solar cell array along the inclination direction of the angle θ is L (m), respectively, and the first solar cell array The shortest distance in the vertical direction from the solar cell module to the installation surface of the solar cell module and the second solar cell array is a (m), the south-south altitude of the sun at the winter solstice is α (°), Β (° When the distance between the first solar cell array and the second solar cell array along the one direction satisfies Lsinθ · tanγ + Lsinθ / tan (α + γ), the angle γ satisfies γ ≦ 90 ° −β. When satisfying the above, the diffuse reflection member is moved from the position P on the installation surface crossing the perpendicular line along the vertical direction from the end of the first solar cell array on the second solar cell array side to the one direction side ( Lsinθ + acosγ) tanγ + (Lsinθ + acosγ) / tan (β + γ) and a position P1 separated from the position P by a distance of (Lsinθ + acosγ) tanγ + (Lsinθ + acosγ) / tan (α + γ). It is arranged only in the area between.

  According to the above-described solar power generation system, the diffuse reflection member is disposed only in a range where direct sunlight enters the installation surface throughout the year. Thereby, the light guide | induced to the back surface of a solar cell module from a diffused reflection member can be made to inject into the said back surface by the 1st reflected light which has energy with little attenuation by reflection. As a result, the amount of power generation can be increased efficiently while reducing the area of the diffuse reflection member.

It is the top view which looked at the photovoltaic power generation system concerning a 1st embodiment of the present invention from the upper part. It is a perspective view which expands and shows the 1st solar cell array, the 2nd solar cell array, and a diffuse reflection member among the photovoltaic power generation systems concerning a 1st embodiment of the present invention. It is a side view which expands and shows the 1st solar cell array, the 2nd solar cell array, and a diffuse reflection member among the photovoltaic power generation systems concerning a 1st embodiment of the present invention. It is a figure which shows the solar cell module used for the solar energy power generation system which concerns on 1st Embodiment of this invention, (a) shows the top view seen from the surface side, (b) is A- of FIG. 4 (a). Sectional drawing in A 'line is shown. It is a model figure which shows the direction and luminous intensity of reflected light when the light which injected into the diffuse reflection member is diffused and reflected. It is a perspective view which expands and shows the 1st solar cell array, 2nd solar cell array, and diffused reflection member which used the mount of the shape different from FIG. 2 among the photovoltaic power generation systems which concern on 1st Embodiment of this invention. It is a side view for demonstrating the distance between the 1st solar cell array of the photovoltaic power generation system which concerns on 1st Embodiment of this invention, and a 2nd solar cell array. It is a side view for demonstrating the position where direct sunlight injects into the installation surface 2 of the solar energy power generation system which concerns on 1st Embodiment of this invention, and the position which arrange | positions a diffuse reflection member. It is a side view which shows the incident light and reflected light to the solar energy power generation system which concern on 1st Embodiment of this invention. It is a side view which shows the solar energy power generation system which concerns on 2nd Embodiment of this invention. It is a side view which shows the solar energy power generation system which concerns on 2nd Embodiment of this invention. It is drawing explaining the electrical connection of the photovoltaic power generation system which concerns on 3rd Embodiment of this invention, (a) is a perspective view which shows a photovoltaic power generation system, (b) is in a photovoltaic power generation system. It is a model figure which shows the electrical connection path | route of a solar cell module. It is a figure which shows the solar cell module used for the solar energy power generation system which concerns on 4th Embodiment of this invention, and is sectional drawing which shows the site | part corresponded to FIG.4 (b).

  A photovoltaic power generation system according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the solar power generation system 1 according to the first embodiment includes a plurality of solar cell arrays 3 on an installation surface 2 that is a site. Further, as shown in FIG. 2, the solar cell array 3 includes a gantry 4 and a double-sided light receiving solar cell module 20 fixed on the gantry 4. Moreover, as shown in FIG. 2 and FIG. 3, the photovoltaic power generation system 1 is installed between two solar cell arrays 3 arranged side by side in the direction of the meridian in adjacent solar cell arrays 3. It has a diffuse reflection member 5 disposed on the surface 2. Next, members constituting the solar power generation system 1 will be described.

<Solar cell module>
The solar cell module 20 is a double-sided light-receiving solar cell module that can make light incident from the front and back sides contribute to power generation. For example, as shown in FIG. 4, the solar cell module 20 includes a rectangular solar cell panel 21 and a frame 22 arranged on the outer periphery of the solar cell panel 21.

  The solar cell module 20 has a substantially plate shape and can generate electric power by photoelectrically converting light received from the main surfaces on both sides, and corresponds to the solar cell module surface 20A and the back surface of the solar cell module surface 20A. Module back surface 20B. The solar cell panel 21 includes, in order from the solar cell module surface 20A side, a plurality of solar cells 26, a filler 24, a transparent back surface protection member 27, and a plurality of solar cells 26 connected by a translucent substrate 23, a filler 24, and an inner lead 25. A terminal box 28 is provided.

  The translucent substrate 23 functions as a substrate for the solar cell module. Examples of such translucent substrate 23 include tempered glass or white plate glass.

  The pair of fillers 24 have a function of sealing the solar battery cells 26 and transmitting light. Examples of such filler 24 include thermosetting resins such as ethylene vinyl acetylate copolymer.

  The inner lead 25 has a function of electrically connecting adjacent solar cells 26 to each other. As such an inner lead 25, for example, a copper foil coated with solder for connecting to the solar battery cell 26 can be cited.

  The solar battery cell 26 has a function of converting light incident from both the front and back surfaces into electricity. Such a solar battery cell 26 has, for example, a substrate made of single crystal silicon, polycrystalline silicon, or the like, and electrodes provided on the front surface (upper surface) and the rear surface (lower surface) of the substrate. The solar battery cell 26 having a single crystal silicon substrate or a polycrystalline silicon substrate has a quadrangular shape. At this time, the magnitude | size of the one side of the photovoltaic cell 26 should just be 100-200 mm, for example. In the solar cell 26 having such a silicon substrate, for example, an electrode located on the surface of one solar cell 26 and an electrode located on the back surface of the other solar cell 26 among the adjacent solar cells 26. Are electrically connected by an inner lead 25. Thereby, the some photovoltaic cell 26 is arranged so that it may be connected in series.

In addition, the kind of the photovoltaic cell 26 will not be restrict | limited especially if it has the function to photoelectrically convert the light which injected from both front and back. For example, a thin film solar cell made of thin film silicon, amorphous silicon, or CIGS material may be employed. As the thin film solar cell described above, for example, a glass substrate on which a photoelectric conversion layer such as an amorphous silicon layer, a CIGS layer, or a CdTe layer and a transparent electrode are appropriately laminated can be used. Such a thin film solar cell is obtained by patterning and integrating a photoelectric conversion layer and a transparent electrode on a glass substrate. Therefore, the thin film solar cell does not use the inner lead 25. Note that the thin film solar cell has a strip shape. In the case of a thin film solar cell, the area of each element needs to be the same. Therefore, for example, when a thin film solar cell is used for the pentagonal first solar cell module 1, the width of each solar cell is set so that the areas of the electrically connected solar cells are the same. May be used after adjusting. Furthermore, the solar battery cell 26 may be of a type in which a thin film of amorphous silicon is formed on a single crystal or polycrystalline silicon substrate.

  The transparent back surface protection member 27 has a function of protecting the solar cell module back surface 20 </ b> B of the solar cell module and transmitting light incident from the solar cell module back surface 20 </ b> B to the solar cells 26. The transparent back surface protection member 27 is bonded to the filler 24 located on the solar cell module back surface 20B side. As such a transparent back surface protection member 27, a transparent PEN film, PET film, etc. other than tempered glass and white plate glass can be used.

  The terminal box 28 takes out the output obtained by the solar battery cell 26 to the outside. The terminal box 28 is preferably arranged at a position not facing the solar battery cell 26 so as not to block light incident from the back surface. The terminal box 28 includes a box, a terminal plate disposed in the box, and an output cable for leading power to the outside of the box. Examples of the material of the box include modified polyphenylene ether resin (modified PPE resin) and polyphenylene oxide resin (PPO resin).

<Stand>
The gantry 4 is a frame that supports the solar cell module 20. As shown in FIG. 3, the gantry 4 can fix the solar cell module 20 at a desired angle θ (°) with respect to the installation surface 2. The rail material that supports the solar cell module 20 of the gantry 4 may have a structure that does not block the reflected light 10 from the diffuse reflection member 5 as much as possible. The angle θ with respect to the installation surface 2 of the solar cell module 20 may be such that the angle of the solar cell module 20 with respect to the horizontal surface 6 is less than 90 ° when the angle of the installation surface 2 is γ (°). That is, it is only necessary to satisfy the relationship of 0 ° ≦ θ <90 ° −γ.

  As shown in FIG. 2, the gantry 4 may be supported at the four corners by columns 4a, but may have a structure that is supported by a single column 4b as shown in FIG. As the gantry 4, for example, a light metal such as an aluminum alloy or an iron material protected by hot dip galvanizing can be used. Such a gantry 4 can be installed on an installation surface 2 such as the ground or a flat roof of a building.

<Diffusion reflection member>
The diffuse reflection member 5 is a member having a higher reflectance than the installation surface 2 and a property of diffusing and reflecting incident light 9. The diffuse reflection member 5 can be fixed on the installation surface 2 using a peg or the like. As shown in FIG. 5, the reflected light 10 from the diffuse reflection member 5 includes a regular reflection component 10 a having substantially the same incident angle and reflection angle, and a diffuse reflection component 10 b that diffuses and reflects in various directions. . FIG. 5 shows the luminous intensity 11 obtained by the light reflected by the diffuse reflection member 5. As shown in FIG. 5, the reflected light 10 has a luminous intensity 11 in which the diffuse reflection component 10b in the vicinity of the regular reflection component 10a is larger than the diffuse reflection component 10b reflected at a position away from the regular reflection component 10a. .

  For such a diffuse reflection member 5, a member having a higher reflectance than the installation surface 2 may be used. For example, an aluminum oxide plate having a reflectance of 80 to 85% and a white paint having a reflectance of about 70 to 85% are used. A coated plate material or a cloth material in which a polyester fabric having a reflectance of 75 to 85% is coated with polyvinyl chloride, rubber, or the like may be used. The installation surface 2 is gravel, concrete surface, grassland, or the like. In addition, the reflectance of gravel and concrete surface is 15 to 30%, and the reflectance of grassland is about 10%.

  Next, the structure of the photovoltaic power generation system 1 will be described with reference to the drawings.

  The solar power generation system 1 has two solar cell arrays 3 arranged in one direction in the direction of the meridian as shown in FIGS.

  Taking the case where the photovoltaic power generation system 1 is installed in the northern hemisphere as an example, the solar cell array 3 located on the south side when the sun goes south is referred to as a first solar cell array 3A. From the first solar cell array 3A The solar cell array 3 located on the north side is also referred to as a second solar cell array 3B. Moreover, let the main surface on the side facing the sun which consists of the several solar cell module 20 of 3 A of 1st solar cell arrays be the 1st surface 3A1, and let the main surface of the back side of 1st surface 3A1 be the 1st back surface 3A2. Similarly, a main surface composed of a plurality of solar cell modules 20 on the side facing the sun of the second solar cell array 3B is a second surface 3B1, and a main surface on the back side of the second surface 3B1 is a second back surface 3B2.

  Next, various numerical values and positions used in the following description will be described. First, as shown in FIG. 7, the first solar cell array 3 </ b> A has a first height 3 </ b> A <b> 1 (corresponding to a seventh position P <b> 7, which will be described later) and a vertical direction toward the installation surface 2. When one imaginary line S1 is arranged, the intersection of the first imaginary line S1 and the installation surface 2 is defined as a position P. When the first solar cell array 3A is viewed from the side, the first imaginary line S1 is substantially at the same position as the column 4a that supports the ridge side of the first solar cell array 3A. Further, as shown in FIG. 8, the second virtual line S2 drawn perpendicularly from the seventh position P7, which is the position of the maximum height of the first surface 3A1 of the first solar cell array 3A, toward the installation surface 2 is provided. When arranged, the intersection of the second virtual line S2 and the installation surface 2 is defined as a position P4.

In addition, the angle and size of each member of the photovoltaic power generation system 1 and the sun's south and middle altitude are
Angle of installation surface 2 with respect to the horizontal plane: γ (°)
Angle with respect to installation surface 2 of solar cell module 20: θ (°)
Length of first surface of first solar cell array: L
Length of second surface of second solar cell array: L
Shortest distance in the vertical direction from the solar cell module 20 to the installation surface 2 of the first solar cell array: a
Shortest distance in the vertical direction from the solar cell module 20 to the installation surface 2 of the second solar cell array: a
Southern Mid-Altitude of the winter solstice: α (°)
Mid-sea altitude of the sun during the summer solstice: β (°)
Represented by

As shown in FIG. 7, the second solar cell array 3B is separated from the first solar cell array 3A in order to avoid a decrease in the amount of power generated due to the shadow of the first solar cell array 3A being applied to the second surface 3B1. Arranged. The distance corresponds to the distance D when viewed in the direction along the installation surface 2. The distance D can be determined with reference to the winter middle solstice altitude α at which the south-middle altitude decreases and the shadow becomes longer as shown in FIG. The distance D corresponds to the total distance of the distance D1 and the distance D2, as shown in FIG. At this time, the distance D1 and the distance D2 are the distance D1 = Lsinθ · tanγ and the distance D2 = Lsinθ / tan (α + γ), respectively. Therefore, the distance D is equal to the distance D =
First distance D1 + second distance D2 = Lsin θ · tan γ + L sin θ / tan (α + γ).

  When the distance between the first solar cell array 3A and the second solar cell array 3B is the distance D, direct sunlight from the winter solstice is installed along a line in the direction 7 in the south of the winter solstice as shown in FIG. The light enters the second position P2 of the surface 2. Further, as shown in FIG. 8, the direct sunlight in the summer solstice enters the range from the first position P1 to the third position P3 through the first range 8a along the line 8 in the south-south direction of the summer solstice. In addition, the altitude of the sun varies in the range from the southern middle altitude α (°) of the winter solstice to the southern middle altitude β (°) of the summer solstice. Therefore, the region where the direct sunlight is incident on the installation surface 2 moves between the first position P1 and the second position P2 in accordance with the yearly change of the solar south-middle altitude.

In FIG. 8, the distance between the position P and the fourth position P4 is the third distance D3, the distance between the fourth position P4 and the first position P1 is the fourth distance D4, and the fourth position P4 and the fourth position When the distance between the two positions P2 is the fifth distance D5, each distance is
Third distance D3 = (L · sinθ + a · cosγ) · tanγ
Fourth distance D4 = (L · sin θ + a · cos γ) / tan (β + γ)
5th distance D5 = (L · sinθ + a · cosγ) / tan (α + γ)
Can be expressed as

Here, the sixth distance D6 from the position P to the first position P1 is the total distance of the third distance D3 and the fourth distance D4, and the seventh distance D7 from the position P to the second position P2 is: Since this is the total distance of the third distance D3 and the fifth distance D5, each distance is
6th distance D6 = (L · sin θ + a · cos γ) · tan γ + (L · sin θ + a · cos γ) / tan (β + γ)
7th distance D7 = (L · sin θ + a · cos γ) · tan γ + (L · sin θ + a · cos γ) / tan (α + γ)
Can be expressed as

  The above equation is established when the incident angle of sunlight on the installation surface 2 is 90 ° or less. Therefore, the range of the angle γ of the installation surface with respect to the horizontal plane is such that the incident angle of sunlight on the installation surface 2 is 90 ° or less at the south to mid altitude β of the summer solstice. That is, the range of the angle γ is 0 ° ≦ γ ≦ 90 ° −β.

  The diffuse reflection member 5 is disposed on the installation surface 2 in a region between the first position P1 and the second position P2, which is a region where direct sunlight enters when viewed throughout the year.

  Next, the effect of this embodiment is demonstrated. Generally, the energy of reflected light attenuates geometrically as reflection is repeated a plurality of times. For example, when the diffuse reflection member 5 having a reflectance of 70% is used, direct sunlight with an incident energy of 100% is attenuated to 70% energy by the first reflection, and 49% by the second reflection. It is attenuated to 34% energy by the third reflection. As described above, since the energy of the reflected light after the second time is attenuated rapidly, the reflected light after the second time hardly contributes to the photoelectric conversion, and the increase in the power generation amount becomes small.

  On the other hand, the solar power generation system 1 according to the present embodiment diffuses and reflects on the installation surface 2 between the first position P1 and the second position P2 where direct sunlight enters the installation surface 2 when viewed through one year. The member 5 is arranged. As a result, as shown in FIG. 9, the first reflected light 10 with high energy can be easily guided to the first back surface 3A2 of the first solar cell array 3A and the second back surface 3B2 of the second solar cell array. As a result, in the present embodiment, it is possible to efficiently increase the amount of power generation while reducing the installation area of the diffuse reflection member 5. As described above, in the present embodiment, the arrangement of the diffuse reflection member 5 with respect to the first solar cell array 3A and the second solar cell array 3B is determined in consideration of the south and middle altitudes of the summer solstice and the winter solstice. 5, the reflected light reflected by the diffuse reflection member 5 can be efficiently incident on the back surface of each solar cell module 20.

  Furthermore, in this embodiment, by using the diffuse reflection member 5, the reflected light 10 is easily diffused and reflected in directions other than regular reflection as shown in FIG. Accordingly, even when the first back surface 3A2 of the first solar cell array 3A or the second back surface 3B2 of the second solar cell array 3B is not positioned in the direction of regular reflection of the incident light 9, there is little attenuation 1 The second reflection is incident on the first back surface 3A2 and the second back surface 3B2, and the power generation amount can be increased efficiently.

  In the present embodiment, since the diffuse reflection member 5 capable of diffusely reflecting the light is used, the first back surface 3A2 and the second back surface 3B2 that are not positioned in the direction of regular reflection of the incident light 9 are also diffused. A reflection component is incident. Thereby, the reflected light 10 can be guided to the back surface 20 </ b> B of the solar cell module 20 without depending on the height of the gantry 4. As a result, in this embodiment, the length of the column 4a of the gantry 4 can be shortened to improve the workability and shorten the construction period. In addition, the materials used for the columns 4a and the diffuse reflection member 5 can be reduced.

(Second Embodiment)
As shown in FIGS. 10 and 11, the photovoltaic power generation system 1 according to the present embodiment has an angle φ (° larger than the angle γ (°) with respect to the first reflecting surface 5a along the installation surface 2 and the horizontal plane. 1) in that the diffuse reflection member 5 having the second reflection surface 5b that is incident on the first back surface 3A1 of the solar cell module 20 of the first solar cell array 3A is used. Is different. Furthermore, the diffuse reflection member 5 in the present embodiment has a third reflection surface 5c that makes light incident on the second surface 3B1 including the plurality of solar cell modules 20 of the second solar cell array 3B.

  In the following description, the point at which the third virtual line S3 extending the second surface 3B1 of the second solar cell array 3B in FIG. 11 intersects the installation surface 2 is referred to as a fifth position P5.

  As shown in FIG. 11, the reflected light 10 from the diffuse reflection member 5 closer to the first solar cell array 3A than the fifth position P5 is reflected once again at any location, and the light traveling direction vector is If not changed, the light does not enter the second back surface 3B2 of the second solar cell array 3B. In addition, during the summer solstice shown in FIG. 8, the specular reflection component having high energy in the reflected light may be diffused into the atmosphere without being incident on the first solar cell array 3A and the second solar cell array 3B. is there.

  Therefore, in the present embodiment, as shown in FIG. 11, in the diffuse reflection member 5 closer to the first solar cell array 3 </ b> A than the fifth position P <b> 5, the angle with respect to the horizontal surface 6 is made larger than the installation surface 2. The second reflecting surface 5b facing the first back surface 3A1 is provided. Accordingly, the diffuse reflection member 5 is provided with a third reflection surface 5c that connects the first reflection surface 5a and the second reflection surface 5b. Thereby, among the reflected light 10 reflected by the second reflecting surface 5b, the regular reflection component 10a at the time of the summer solstice described above can easily enter the first back surface 3A1 of the first solar cell array 3A. In addition, the regular reflection component 10a out of the reflected light 10c reflected by the third reflection surface 5c is likely to enter the second back surface 3B2 of the second solar cell array 3B. As a result, the power generation amount of the solar power generation system 1 is further increased.

  In the present embodiment, as shown in FIG. 11, the second reflecting surface 5b and the third reflecting surface 5c are preferably provided closer to the first solar cell array 3A than the fifth position P5, so that the first position P1. And the fifth position P5. More specifically, since the distance between the position P and the first position P1 is D6, the sixth distance D6 is the sixth distance D6 = (L · sin θ + a · cos γ) · tan γ + (L · sin θ + a · cos γ) / tan (Β + γ).

Further, since the ninth distance D9 between the position P and the fifth position P5 is obtained by subtracting the eighth distance D8 from the distance D, it can be expressed by the following equation. The eighth distance D8 is a distance between the fifth position P5 and the sixth position P6. Accordingly, the eighth distance D8 is equal to the eighth distance D8 = a.
Cosγ / tanθ−a · sinγ, the ninth distance D9 is the ninth distance D9 = distance D−the eighth distance D8 = L · sinθ · tanγ + L · sinθ / tan (α + γ) − (a · cosγ / tan θ−a · sin γ).

The condition of the angle ψ (°) of the third inclined surface 5c for the regular reflection component 10a of the reflected light 10 to enter the second surface 3B1 of the second solar cell array 3B from the third inclined surface 5c at the summer solstice. Is
ψ> (θ−β) / 2.

(Third embodiment)
Next, as shown in FIG. 12, the photovoltaic power generation system 1 according to the present embodiment is electrically connected in series in a direction orthogonal to the inclination direction of the solar cell module when viewed from the normal direction of the installation surface 2. A plurality of solar cell modules 20 connected to each other. The solar power generation system 1 includes a power conditioner 12 and is connected to a load 14 via a distribution line 13 as shown in FIG.

  For example, as shown to Fig.12 (a), the 2nd solar cell array 3B has three solar cell modules 20d of the 4th solar cell module 20d, the 5th solar cell module 20e, and the 6th solar cell module 20f in the inclination direction. In the second solar cell array 3B, the fourth solar cell module 20d positioned below the inclination and the sixth solar cell module 20f positioned above the inclination are reflected on the reflected light 10 incident on the second back surface 3B2. Distribution is possible. As a result, a difference occurs in the amount of current generated by power generation between the fourth solar cell module 20d and the sixth solar cell module 20f. On the other hand, the fourth solar cell modules 20d, the fifth solar cell modules 20e, and the sixth corresponding battery modules 20f that are adjacent to each other in the direction orthogonal to the inclination direction of the second solar cell array 3B are reflected light at the time of south and middle. Since the ten routes are substantially the same, the power generation amount approximates.

  Therefore, in the present embodiment, as shown in FIG. 12B, the solar cell modules 20 adjacent in the direction orthogonal to the inclination direction of the first solar cell array 3A and the second solar cell array 3B are electrically connected in series. Connected. Thereby, it becomes possible to connect the solar cell modules 20 having substantially the same amount of power generation. As a result, a decrease in the power generation amount of the solar cell string caused by the solar cell module 20 having a low power generation amount as a reference in the same solar cell string is reduced.

(Fourth embodiment)
As shown in FIG. 13, the solar power generation system 1 according to this embodiment is the embodiment described above in that the back surface 20B of the transparent back surface protection member 27 of the solar cell module 20 of the second solar cell array 3B has an uneven portion. Is different.

  The south-middle altitude of the sun changes depending on the season, and the reflected light 10 from the diffuse reflection member 5 may enter the transparent back surface protection member 27 at a large angle. For example, since the critical angle between air and glass is about 45 °, when the reflected light 10 from the diffuse reflecting member 5 is incident on the glass at an angle larger than 45 °, the reflected light 10 is Total reflection will occur.

  On the other hand, in this embodiment, as shown in FIG. 13, the total reflection of incident light can be reduced by providing irregularities on the solar cell module back surface 20B side of the transparent back surface protection member 27. Thereby, the reflected light 10 is likely to enter the solar battery cell 26, and the amount of power generation is further increased.

  As such a transparent back surface protection member 27, for example, tempered glass or white plate glass provided with an emboss on the back surface 20B side may be used. Moreover, you may use for the transparent back surface protection member 27 transparent films, such as a PEN film or PET film in which the unevenness | corrugation was formed.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to the said embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of this invention. Needless to say, the present invention includes various combinations of the above-described embodiments.

1: Solar power generation system 2: Installation surface 3: Solar cell array 3A: First solar cell array 3A1: First surface 3A2: First back surface 3B: Second solar cell array 3B1: Second surface 3B2: Second back surface 4 : Stand 4a: Column 4b: Column 5: Diffuse reflecting member 5a: First reflecting surface 5b: Second reflecting surface 5c: Third reflecting surface 6: Horizontal surface 7: South-middle direction of winter solstice 8: South-middle direction of summer solstice 8a: First range 9: Incident light 10: Reflected light 10a: Regular reflection component 10b: Diffuse reflection component 11: Luminance 12: Power conditioner 13: Distribution line 14: Load 20: Solar cell module 20A: Solar cell module surface 20B : Solar cell module back surface 20a-20f: 1st-6th solar cell module 21: Solar cell panel 22: Frame 23: Translucent substrate 24: Filler 25: Inner lead 26: Solar cell 2 : Transparent back protective member 28: terminal box 29: Frame S1 to S3: first to third virtual line P: Position P1 to P7: first to seventh position D: distance D1 to D9: first to ninth distance

Claims (4)

A plurality of double-sided light receiving suns arranged at an angle θ (°) (θ <90 ° −γ) away from the installation surface with respect to a plane parallel to the installation surface having an angle γ (°) with respect to a horizontal plane A first solar cell array and a second solar cell array that have a battery module and are arranged side by side in one direction;
A diffuse reflection member disposed on the installation surface,
The lengths of the surface of the first solar cell array and the surface of the second solar cell array along the inclination direction of the angle θ are respectively L (m), the solar cell module of the first solar cell array, and the first 2 The shortest vertical distance from the solar cell module to the installation surface of the solar cell array is a (m), the altitude of the sun in the winter solstice is α (°), the south in the sun at the summer solstice When the altitude is β (°), the interval along the one direction between the first solar cell array and the second solar cell array satisfies Lsinθ · tanγ + Lsinθ / tan (α + γ) and the angle γ is When satisfying γ ≦ 90 ° −β,
The diffuse reflection member is (Lsinθ + acosγ) tanγ + (Lsinθ + acosγ) from the position P on the installation surface that intersects the vertical line along the vertical direction from the end of the first solar cell array on the second solar cell side. ) / tan and position P1 at a distance of (β + γ), in the one direction side from the position P (Lsinθ + acosγ) tanγ + (Lsinθ + acosγ) / tan (α between a position apart P2 distance + gamma) regions only A solar power generation system is arranged.   The diffuse reflection member emits light to the first reflection surface along the installation surface and the back surfaces of the plurality of solar cell modules of the first solar cell array inclined at an angle larger than an angle γ with respect to a horizontal plane. The photovoltaic power generation system according to claim 1, further comprising an incident second reflecting surface.   The photovoltaic power generation system according to claim 1, wherein the diffuse reflection member is made of a white material.   At least one of the first solar cell array and the second solar cell array is arranged side by side along the one direction when viewed in plan from the normal direction of the installation surface. The photovoltaic power generation system according to any one of claims 1 to 3, comprising the plurality of solar cell modules electrically connected in series in another direction different from one direction.

Images