JP2006332113A - Concentrating solar power generation module and solar power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a concentrating solar power generation module in which decrease in quantity of incident light to a solar cell due to transmission and reflection loss of a secondary optical system can be reduced, heat resistant performance required for the secondary optical system can be reduced, decrease in power generation due to alignment error, tracking error and light intensity distribution can be reduced, and thickness of the module can be reduced. <P>SOLUTION: In a secondary optical system installed between a primary optical system and a solar cell, an opening is arranged to have a center at a part where the intensity of light condensed by the primary optical system becomes strongest. Light entering the opening impinges on the solar cell as it is, light not entering the opening is refracted by the secondary optical system on the periphery of the opening before impinging on the light receiving surface of the solar cell. Since the profile of effective condensing surface of the primary optical system and the profile of the opening in the secondary optical system are substantially similar to the profile of effective light receiving surface of the solar cell, transmission and reflection loss in the secondary optical system can be minimized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technology of a concentrating solar power generation module and a concentrating solar power generation device, and more specifically to a condensing optical system of a concentrating solar cell module.

  As a solar power generation device, a non-condensing fixed structure in which a solar power generation module having a structure in which solar cells are spread without gaps is fixedly installed on a roof or the like on the south surface is generally used. On the other hand, in order to reduce the amount of use of solar cells having a large cost ratio in the solar power generation device, sunlight is condensed on the small solar cells using a primary optical system such as a lens or a reflecting mirror, In recent years, a concentrating tracking solar power generation apparatus that tracks the sun so that the focal point is always on a solar battery cell has attracted attention.

In the concentrating and tracking solar power generation apparatus, the primary optical system and the solar battery cell caused by the difference in the alignment error between the primary optical system and the solar battery cell, the solar tracking error, and the coefficient of thermal expansion of the material constituting the module There is a problem that the amount of incident light on the solar battery cell is reduced due to the positional deviation, and there is a problem that the output of the solar battery cell is lowered due to the in-plane light intensity distribution due to chromatic aberration of the primary optical system.
In order to improve these problems, a secondary optical system is generally provided between a primary optical system such as a Fresnel lens and a solar battery cell. As the secondary optical system, a biconvex lens or a plano-convex lens is used. As shown in FIG. 8, the biconvex lens 2 is installed at a position away from the solar battery cell 3, the sunlight 10 is condensed by the primary optical system 1, and the condensed light 11 is both the secondary optical system. The light 12 is incident and refracted on the convex lens 2 and the condensed light 12 is incident on the solar battery cell 3. Patent Document 1 discloses a structure using a convex lens as a secondary optical system immediately above the surface of a solar battery cell. Further, in Patent Document 2 and Patent Document 3, the light collected by the primary optical system is taken into the secondary optical system made of a translucent material disposed immediately above the solar battery cell and totally reflected by the side surface. A structure that collects on the surface of a solar cell is disclosed.
US Pat. No. 5,167,724 JP 2002-289897 A JP 2003-258291 A

However, when a biconvex lens or a plano-convex lens is used for the secondary optical system, the problem of chromatic aberration is worsened, or the incident light quantity of the solar battery cell is reduced due to reflection / transmission loss of these secondary optical systems. There is.
In the method disclosed in Patent Document 1, since all the light incident on the solar cell passes through the secondary optical system, there is a reflection / transmission loss due to the secondary optical system, and the incident light amount of the solar cell decreases. There is a problem such as.
The methods disclosed in Patent Document 2 and Patent Document 3 are effective in solving the problems of alignment error, chromatic aberration, and light intensity distribution. However, in order to totally reflect the side surface of the secondary optical system, It is necessary to increase the incident angle. For this purpose, it is necessary to design the focal length of the primary optical system to be long and to install the secondary optical system and the solar cell away from the primary optical system accordingly. As a result, the thickness of the photovoltaic power generation module Will become thicker. Increasing the thickness and the weight of the solar cell module leads to an increase in the size of the tracking system on which the concentrating solar power generation module is mounted, leading to an increase in the cost of the concentrating tracking solar power generation apparatus. Furthermore, in this method, there is a problem that the amount of light incident on the solar cell is reduced due to reflection loss at the incident / exit end face of the secondary optical system and transmission loss in the secondary optical system.
Furthermore, in the method using the secondary optical system shown in Patent Document 2 and Patent Document 3, since sunlight received at high density by the primary optical system is directly received, it is used for the secondary optical system. The material is required to have high heat resistance, resulting in a problem that the cost of the apparatus is increased.

  The present invention has been made in view of the above points, and it is possible to reduce a decrease in the amount of incident light on a solar battery cell due to transmission / reflection loss of the secondary optical system, to reduce heat resistance performance required for the secondary optical system, and to alignment errors. An object of the present invention is to provide a module structure capable of reducing a decrease in the amount of power generation due to tracking error, chromatic aberration, and light intensity distribution, reducing the thickness of the module, and simplifying the production of a large array.

In order to solve the above-mentioned problems, in the present invention, a primary optical system that condenses sunlight and a secondary optical system that condenses sunlight irradiated from the primary optical system and irradiates solar cells. And a concentrating solar power generation module including solar cells that receive sunlight irradiated from the primary optical system and the secondary optical system, wherein the secondary optical system has an opening. Structure.
According to this configuration, a part of the light condensed by the primary optical system passes through the opening provided in the secondary optical system, so that there is no reflection / transmission loss due to the secondary optical system. Therefore, the loss of solar energy in the optical system can be reduced.

In the present invention, the opening is provided at a position where a straight line connecting the optical center and the focal point of the primary optical system passes.
According to this configuration, since the opening of the secondary optical system is located at the portion where the light intensity density is maximized, the reflection / transmission loss due to the secondary optical system can be reduced and the material of the secondary optical system is required. Heat resistance is alleviated. The primary optical system may have a plurality of focal points depending on the design, but in this case as well, by providing an opening in the secondary optical system portion where the light intensity density is maximized corresponding to at least each focal point, The effect of the invention can be expected.

According to the invention, the opening connects an arbitrary point A on the outer periphery of the effective light collecting surface of the primary optical system and an arbitrary point B on the outer periphery of the effective light receiving surface of the solar battery cell. A straight line AB is provided at a position passing through the opening.
In this configuration, the effective light collection surface is a surface on which light incident on the surface is refracted as designed, and refers to a portion that functions as an optical system. According to this configuration, since all of the light collected by the primary optical system that can be directly incident on the solar cell passes through the opening in the secondary optical system, the secondary optical system It becomes possible to reduce transmission / reflection loss in the system. The opening is preferably as small as possible within the above range, and all the light that has passed through the opening can be incident on the light receiving surface of the solar battery cell. In addition, when the design is made so that all of the sensitivity wavelength light of the solar cell condensed by the primary optical system is incident on the effective light receiving surface of the solar cell, the tracking angle of the tracking system is shifted, and the solar cell When the light is irradiated outside the effective light receiving surface, the secondary optical system is refracted in the direction of the effective light receiving surface of the solar battery cell.

Further, in the present invention, the effective condensing surface of the secondary optical system is provided at the periphery of the opening, and is configured to receive the sensitivity wavelength light of the solar battery cell refracted by the primary optical system. .
According to this structure, the light which does not include the sensitivity wavelength light of the solar battery cell among the light condensed by the primary optical system is not refracted by the secondary optical system and does not enter the solar cell light receiving surface. For this reason, it can suppress that lights other than the sensitivity wavelength light of a photovoltaic cell enter into a photovoltaic cell light-receiving surface, and it becomes possible to reduce a temperature rise. In general, a material used for a lens has a smaller refractive index in a longer wavelength region and a smaller refraction angle in the primary optical system, and therefore passes outside the secondary optical system. Since this long wavelength light causes a rise in the temperature of the solar battery cell in particular, it is desirable not to enter the solar battery surface.

In the present invention, the shape of the effective condensing surface of the primary optical system, the shape of the opening of the secondary optical system, and the shape of the effective light receiving surface of the solar cell are perpendicular to the optical axis. When projected onto the surface along the optical axis, the shapes were substantially similar to each other.
According to this configuration, since the light collected by the primary optical system is efficiently incident on the solar battery cell through the opening of the secondary optical system, loss due to reflection and transmission of the secondary optical system is reduced. be able to. In this configuration, the perfect similarity is more preferable, but the effect of the present invention is effective if it is substantially similar.

In the present invention, the secondary optical system is attached to a light-shielding plate that shields the light collected by the primary optical system from being directly irradiated to portions other than the vicinity of the solar battery cell. did.
According to this configuration, in the concentrating solar power generation module, light concentrated at a high density is irradiated to a region other than the solar battery cell due to the condensing shift, and members such as wiring and bypass diodes deteriorate. In order to hold the secondary optical system on the light-shielding plate provided to solve such a problem, a special member for holding the secondary optical system is not required, so the secondary optical system is low-cost. Can be provided.

Further, in the present invention, a plurality of the concentrating solar power generation modules are repeatedly arranged in the same plane, and the primary optical system and the secondary optical system are respectively formed in a plurality of integrated arrays. And a plate-like secondary optical system array.
According to this configuration, the primary optical system and the secondary optical system at the time of manufacturing the concentrating solar power generation module can be easily aligned and the number of man-hours can be reduced. Since the primary optical system and the secondary optical system are similarly deformed so as to follow the deformation of the module even when the module is twisted or bent due to wind pressure or the like by fixing the same to the same housing, Optical deviation due to module deformation is unlikely to occur.
Moreover, in this invention, it was set as the structure which mounts the said concentrating solar power generation module in a solar tracking apparatus.
According to this configuration, since a high-power and light-weight concentrating solar cell module is used, it is possible to manufacture a concentrating and tracking solar power generation system with a low driving load and high efficiency and at low cost.

  According to the module structure of the present invention, reduction in the amount of incident light on the solar cell due to transmission / reflection loss of the secondary optical system is reduced, heat resistance performance required for the secondary optical system is reduced, alignment error, tracking error, light It is possible to reduce the decrease in power generation amount due to the intensity distribution and to reduce the thickness of the module.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, only a part of the concentrating solar power generation device is shown, and not all of the device is shown.
FIG. 1 shows a schematic overall view of a concentrating and tracking solar power generation system.
The concentrating solar power generation module 20 is mounted on a tracking drive system 21 that can be driven so that the light receiving surface always faces the sun in accordance with the movement of the sun.
The tracking drive system 21 is composed of two separate tracking drive devices, an azimuth axis for directing the module light-receiving surface toward the sun's azimuth and a tilt axis for tilting the module light-receiving surface at the sun's altitude. Can be tracked with high accuracy. As the tracking drive system, the module is installed so that the tilting axis that tilts to the latitude angle every day according to the solar altitude that varies from day to day, and the concentrating photovoltaic module surface is parallel to the tilting axis direction. A system composed of a two-axis drive device in which the module is rotated around the tilt axis is also common, and such a system may be used.

As a power system for the drive system, a motor and a speed reducer are used to rotate a gear at a predetermined rotational speed to drive it in a predetermined direction, and a hydraulic pump and a hydraulic cylinder are used to adjust the cylinder to a predetermined length. Thus, there is a method of driving in a predetermined direction, and either method may be used.
As a control system (not shown) for controlling the operation of the tracking drive system, a solar orbit is calculated in advance by a clock mounted inside the control system, and a concentrating solar power generation module is installed in that direction. Generally, there are a method for controlling the solar direction and a method for monitoring and controlling the sun direction as needed by attaching a solar sensor such as a photodiode to the system, and either method may be used.

The concentrating solar power generation module 20 is configured by arranging a plurality of units in which a primary optical system, a secondary optical system, and solar cells are arranged as a pair, in order to obtain necessary current and voltage. An appropriate number of individual solar cells are electrically connected.
One unit has a size of several tens of mm to several hundreds of mm, and the size of the entire arrayed module is about several m.
The external size of the solar cell used in the concentrating solar power generation system needs to be as small as possible from the viewpoint of reducing the solar cell material used, which is one purpose of the concentrating system. Things are used.

(First embodiment)
FIG. 2 shows a first embodiment of the concentrating solar power generation module of the present invention. FIG. 2 is a schematic cross-sectional view of one unit of the concentrating solar power generation module. In this embodiment, the primary optical system 1 that condenses the sunlight 10, the secondary optical system 2 that receives and refracts the sunlight 10 collected by the primary optical system 1, and the sunlight 10. Is converted so that each lens surface or light receiving surface is parallel to each other. The sunlight 10 is incident from a direction perpendicular to the primary optical system 1 that is the light receiving surface of the concentrating solar power generation module, that is, from a direction parallel to the optical axis 40 of the optical system, and is incident on the direction indicated by 11 by the primary optical system. The light is refracted and collected in the direction of the solar battery cell 3. The primary optical system 1 is designed to focus at a point beyond the solar battery cell 3 on the optical axis 40 of the present optical system, and the focal point at each wavelength of sunlight 10 is positioned on the optical axis. To do. In the secondary optical system 2, an opening 50 is provided at a position where a straight line connecting the optical center of the primary optical system 1 and the focal point passes, so that the sun out of the light refracted by the primary optical system 1 Light in the sensitivity wavelength region of the battery cell 3 is directly incident on the effective light receiving surface of the solar cell 3 through the opening 50, or is incident on the effective condensing surface 2a of the secondary optical system 2 and is refracted. It is designed to enter the effective light receiving surface of the cell 3.

FIG. 3 is a light intensity distribution of the refracted light 11 passing through a line 3a-3b perpendicular to the optical axis. Generally, in the sensitivity wavelength region of a solar cell, the refractive index of the primary optical system material decreases as the wavelength increases, so that the refractive angle in the primary optical system 1 decreases, so-called chromatic aberration exists, and the light intensity is primary optical. Near the center of the system 1, that is, near the optical axis 40 is the maximum. In the present embodiment, an opening 50 is provided in a portion through which the optical axis 40 of the secondary optical system 2 passes, and the light intensity shown in FIG. 3 among the light collected by the primary optical system 1 is maximum. This portion of light passes through the opening 50 of the secondary optical system 2 and directly enters the solar cell 3.
Thereby, it is possible to reduce the reflection loss and transmission loss of the secondary optical system 2 in the portion with the strongest light intensity. Since the total reflection / transmission loss at the front and back surfaces of the secondary optical system 2 is about 10%, the solar cell power generation loss is reduced as compared with the case where a secondary optical system without an opening is provided. It can be greatly reduced. Further, since the high-density light condensed by the primary optical system 1 passes through the opening 50 of the secondary optical system 2, the heat resistance required for the material of the secondary optical system 2 is reduced. There is.

  As described above, since the refractive index of the material of the primary optical system 1 is smaller at the long wavelength than at the short wavelength, the light refracted in the primary optical system 1 is the short wavelength light 13 as shown in FIG. Although it is strongly refracted toward the solar cell 3, the long wavelength light 14 cannot enter the solar cell 3 without the secondary optical system 2 because the refraction angle in the primary optical system 1 is small. . The effective condensing surface 2a of the secondary optical system 2 is provided on the entire portion other than the opening 50 of the secondary optical system 2, and all the light incident on the secondary optical system 2 is refracted, and the solar battery cell 3 The effective light receiving surface is irradiated. In this way, it is possible to improve the problem of chromatic aberration of the optical system. Further, even when an alignment shift occurs due to the tracking error of the tracking system, the shifted light is refracted by the secondary optical system 2 toward the solar battery cell 3 and can be guided to the effective light receiving surface of the solar battery cell 3. . Further, regarding the problem of the light intensity distribution shown in FIG. 3, when the secondary optical system 2 is not provided, the light that protrudes outside the solar battery cell is reflected by the secondary optical system 2 so that the light intensity in the light receiving surface of the solar battery cell 3 is reduced. By designing to irradiate the weak part, the problem of light intensity distribution can be improved.

  Examples of the primary optical system 1 constituting this embodiment include a biconvex lens, a plano-convex lens, and a Fresnel lens. However, the light receiving surface is flat because of its weight, cost, and ease of handling in the usage environment. A Fresnel lens having a substantially triangular cross section on the side is desirable. Further, the primary optical system 1 may be an array having a plurality of the same optical systems arranged and integrally formed. As a material of this lens, a material having a high transmittance of light of sensitivity wavelength of the solar battery cell and having weather resistance is preferable. For example, white plate glass generally used for solar cell modules, weather resistant grade acrylic, polycarbonate and the like can be mentioned. The material of the primary optical system 1 is not limited to these, and may be composed of a multilayer of these materials. Moreover, in these materials, it is also possible to add an appropriate ultraviolet absorber for the purpose of preventing ultraviolet degradation of the material inside the concentrating solar power generation module and ultraviolet degradation of the primary optical system 1. . Moreover, in order to reduce the light reflectance in the sensitivity wavelength region of the solar battery cell 3, an appropriate antireflection film or the like can be provided. Furthermore, it is possible to provide a UV reflection film, an infrared reflection film, or the like that reflects light having a wavelength other than the sensitivity wavelength region of the solar battery cell 3.

  As the solar cell 3 constituting this embodiment, an inorganic solar cell made of Si, GaAs, CuInGaSe, CdTe or the like, or an organic solar cell such as a dye-sensitized solar cell is used. As the structure of the solar battery cell, a single junction type cell, a monolithic multi-junction type cell, a mechanical stack cell in which various solar cells having different sensitivity regions are connected, or the like is used. As the concentrating solar power generation module, since high efficiency is particularly required, it is preferable to use an InGaP / GaAs / Ge3 junction solar cell or a mechanical stack cell.

  Examples of the secondary optical system 2 include a biconvex lens, a plano-convex lens, a Fresnel lens, a substantially triangular prism, and the like having an opening. From the viewpoint of weight and cost, the Fresnel lens and the cross section are triangular. A prism having a shape is desirable. Moreover, as a material of this lens, what has a high transmittance | permeability in the sensitivity wavelength range of the photovoltaic cell 3 and a weather resistance is good, for example, glass, an acryl, a polycarbonate etc. are mentioned. Since the opening 50 is provided in the portion of the secondary optical system 2 where the light intensity density is high, the heat resistance required for the material is relaxed, and it is possible to use a resin such as acrylic. The material of the secondary optical system 2 is not limited to these, and may be composed of a multilayer of these materials. Moreover, in these materials, it is also possible to add an appropriate ultraviolet absorber for the purpose of preventing ultraviolet degradation of the material inside the concentrating solar power generation module and ultraviolet degradation of the secondary optical system 2. . Moreover, in order to reduce the light reflectance in the sensitivity wavelength region of the solar battery cell 3, an appropriate antireflection film or the like can be provided. Furthermore, a UV reflection film that reflects light having a wavelength other than the sensitivity wavelength region of the solar battery cell 3, an infrared reflection film, or the like can be provided.

  The effective condensing surface of the secondary optical system 2 is desirably a region through which light in the sensitivity wavelength region of the solar battery cell 3 passes on the light receiving surface of the secondary optical system 2. The sunlight collected by the primary optical system 1 causes chromatic aberration as shown in FIG. 4, and with respect to the total amount of light at that position as it moves away from the optical axis 40 within the light receiving surface of the secondary optical system 2. The proportion of long-wavelength light increases, and the light in the sensitivity wavelength region of the solar battery cell 3 does not exist when it is far away from a certain point. By setting the effective condensing surface of the secondary optical system 2 to this position, light with a wavelength longer than the sensitivity wavelength region is not incident on the solar battery cell 3 and the efficiency of the solar battery cell 3 is reduced. The causative temperature rise can be reduced.

  The secondary optical system 2 is designed and attached between the primary optical system 1 and the solar battery cell 3 so that the refracted light 12 enters the solar battery cell 3. In order to hold the secondary optical system 2, it is possible to provide a special holding unit, but it is preferable that the secondary optical system 2 is preferably attached to a light shielding plate that is generally attached to a concentrating solar power generation module. . As shown in FIG. 5, members such as wirings 52 for connecting the solar cells in series and parallel exist around the solar cells 3. The surface of the wiring or the like is covered with an organic material or the like to ensure insulation, and this covered portion has low heat resistance. Even when the focused spot 18 is shifted due to a situation in which a large tracking shift occurs and sunlight is incident obliquely on the primary optical system as indicated by reference numeral 17, the light is not directly applied to the wiring or the like. A light shielding plate 51 made of metal or the like is disposed. By attaching the secondary optical system 2 to the light shielding plate 51, it is not necessary to provide a special member for holding the secondary optical system 2 with the introduction of the secondary optical system 2, and the secondary optical system 2 can be provided at low cost. It becomes possible.

(Second Embodiment)
FIG. 6 shows a second embodiment of the concentrating solar power generation module of the present invention. FIG. 6 is a bird's-eye view of one unit of the concentrating solar power generation module.
When L is a straight line connecting an arbitrary point A on the outer periphery of the effective light-collecting surface of the primary optical system and an arbitrary point B on the outer periphery of the effective light-receiving surface of the solar battery cell, point A and point No matter where B is set on the outer circumference, the straight line L passes through the opening 50 and the shape of the opening 50 becomes the smallest in the installation surface of the secondary optical system 2. Provided.

  In the present embodiment, the shape of the effective condensing surface of the primary optical system 1, the shape of the opening 50 of the secondary optical system 2, and the shape of the effective light receiving surface of the solar battery cell 3 are rectangular similar shapes. The area of the opening 50 of the secondary optical system 2 is minimized under the condition that the relative positions and lens shapes of the primary optical system 1, the secondary optical system 2, and the solar battery cell 3 are designed by optical design. The shape is determined as follows. The distance of the secondary optical system 2 from the primary optical system 1 is determined together with the lens design of the secondary optical system 2 so that the light refracted by the secondary optical system 2 is irradiated into the light receiving surface of the solar battery cell 3. The shape is determined so that the area of the opening 50 is minimized at the determined position.

The shortest wavelength light of the sensitivity wavelength of the solar battery cell 3 is designed to pass through the opening 50 of the secondary optical system 2 and to enter the effective light receiving surface of the solar battery cell 3. The external dimensions of the effective condensing surface of the secondary optical system 2 are determined by the same method as in the first embodiment, and light including the sensitivity wavelength of the solar battery cell 3 among the sunlight refracted by the primary optical system 1. Only the light is incident on the effective condensing surface of the secondary optical system 2 and is refracted and is incident on the effective light receiving surface of the solar battery cell 3. With this structure, extra light is not incident on the solar battery cell 3, and the temperature rise can be minimized. In the present embodiment, the outer shape of the effective condensing surface of the secondary optical system 2 is the shape of the effective condensing surface of the primary optical system 1, the shape of the opening 50 of the secondary optical system 2, and the solar battery cell. 3 and the shape of the effective light receiving surface.
In this embodiment, the shape of the effective condensing surface of the primary optical system 1, the shape of the opening of the secondary optical system 2, and the shape of the effective light receiving surface of the solar cell 3 are rectangular, but the shape is Although not limited to a rectangle, for example, a circle or a polygon is used. However, when a plurality of concentrating solar power generation module units are used side by side, the primary optical system 1 is used to spread the primary optical system without gaps. A rectangular shape is desirable as the outer shape.

According to the present embodiment, since all the sunlight that is collected by the primary optical system 1 and can be directly incident on the solar battery cell 3 passes through the opening of the secondary optical system 2, the secondary optical system. The transmission / reflection loss at 2 is reduced. Further, since the portion having a high light density passes through the opening 50, the heat resistance required as a material for the secondary optical system 2 can be reduced. If the shape of the effective condensing surface of the primary optical system 1, the shape of the opening of the secondary optical system 2, and the shape of the effective light receiving surface of the solar cell 3 are similar, the effect is greater. If it is substantially similar, the effect can be produced. For example, with respect to the effective condensing surface of the rectangular primary optical system 1 and the opening of the secondary optical system 2, the effective light receiving surface of the solar battery cell 3 is slightly changed to have a rectangular corner curvature. However, almost the same effect can be expected, and the effect is only reduced as the shape deviates from the similar shape.
In addition, the secondary optical system 2 is held on the light-shielding plate as in the first embodiment.

(Third embodiment)
FIG. 7 shows a third embodiment of the concentrating solar power generation module of the present invention. The individual module units are the same as those in the second embodiment, but may be in other forms. In this figure, the concentrating solar power generation modules are arranged in 2 × 2 in the same plane, and the primary optical system 1 and the secondary optical system 2 are each molded in a 2 × 2 arrangement. The plate-shaped primary optical system 1 array and the plate-shaped secondary optical system 2 array are formed. The number of arrangements of the primary optical system 1 and the secondary optical system 2 is not particularly limited. Since the primary optical system 1 and the secondary optical system 2 are each in the form of an array and the area increases, the primary optical system 1 and the secondary optical system 2 are used when the concentrating solar power generation module is assembled. This makes it easy to check the misalignment, and the alignment work becomes easy. In addition, since the array of the primary optical system 1 and the array of the secondary optical system 2 are fixed to the same housing, the primary deformation system is deformed due to the twist and deflection caused by the wind pressure of the concentrating solar power generation module. Since the optical system 1 and the secondary optical system 2 follow and deform in the same manner, relative positional deviation due to module deformation is less likely to occur, and the occurrence of optical axis deviation can be suppressed.

  The primary optical system 1 and the secondary optical system 2 may be integrally formed at the time of molding, or individually molded ones may be joined and integrated by post-processing. Further, the secondary optical system 2 may be a complete plate-like one in which the individual secondary optical systems 2 may be integrated by the connecting portion 53, and the individual secondary optical systems 2 are connected to each other without a gap. But you can. In terms of followability to module deformation, it is desirable that the secondary optical system 2 has a complete plate shape that is connected without a gap. Further, as a preferred example, the light shielding plate 51 described in the first embodiment has a structure in which a plurality of openings 50 are provided on a single plate corresponding to the array, and each of the openings 50 has a secondary optical system 2. It can be set as the structure which installs.

It is a schematic whole figure of a condensing tracking type solar power generation device. It is a schematic sectional drawing of the concentrating solar power generation module which concerns on the 1st Embodiment of this invention. It is intensity distribution of the condensed light. It is a figure which shows the relationship of chromatic aberration. It is a figure by which the secondary optical system is hold | maintained at the light-shielding plate. It is a schematic bird's-eye view of the concentrating photovoltaic power generation module which concerns on the 2nd Embodiment of this invention. It is a schematic bird's-eye view of the concentrating photovoltaic power generation module which concerns on the 3rd Embodiment of this invention. It is a schematic sectional drawing of the conventional concentrating solar power generation module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary optical system 2 Secondary optical system 2a Effective condensing surface 3 of a secondary optical system 3 Solar cell 3a-3b Line 10 perpendicular | vertical with respect to an optical axis Sunlight 11 perpendicularly incident on a primary optical system 11 Primary Light incident perpendicularly to the optical system, condensed light 12 Light refracted by the secondary optical system 13 Short wavelength light condensed by the primary optical system 14 Long wavelength light 15 condensed by the primary optical system Short wavelength light 16 refracted by the secondary optical system Long wavelength light refracted by the secondary optical system 17 Sunlight incident obliquely on the primary optical system 18 Light incident obliquely on the primary optical system and refracted 20 Concentrating solar power generation module 21 Tracking drive system 40 Optical axis 50 of this optical system Opening 51 Shading plate 52 Wiring material 53 Connecting portion A A point on the outer periphery in the effective condensing surface of the primary optical system B Solar cell Point L on the outer circumference of the effective light receiving surface of the straight line connecting point A and point B

Claims (8)

A primary optical system for condensing sunlight, a secondary optical system for condensing sunlight irradiated from the primary optical system and irradiating the solar cell, and the primary optical system and the secondary optical system A concentrating solar power generation module comprising solar cells that receive sunlight irradiated from
The concentrating solar power generation module, wherein the secondary optical system has an opening. The concentrating solar power generation module according to claim 1, wherein the opening is provided at a position where a straight line connecting the optical center and the focal point of the primary optical system passes. In the opening, a straight line AB connecting an arbitrary point A on the outer periphery of the effective light collection surface of the primary optical system and an arbitrary point B on the outer periphery of the effective light receiving surface of the solar battery cell passes through the opening. The concentrating solar power generation module according to claim 1, wherein the concentrating solar power generation module is provided at a position. The effective light condensing surface of the secondary optical system is provided at the periphery of the opening, and the sensitivity wavelength light of the solar battery cell refracted by the primary optical system is incident thereon. 4. The concentrating solar power generation module according to any one of 3 above. The shape of the effective condensing surface of the primary optical system, the shape of the opening of the secondary optical system, and the shape of the effective light receiving surface of the solar battery cell are perpendicular to the optical axis. 5. The concentrating solar power generation module according to claim 1, wherein when projected along, the shapes are substantially similar to each other. 6. 2. The secondary optical system is attached to a light-shielding plate that shields light collected by the primary optical system so that light other than the vicinity of the solar battery cell is not directly irradiated. 6. The concentrating solar power generation module according to any one of items 1 to 5. A plurality of concentrating solar power generation modules according to any one of claims 1 to 6 are repeatedly arranged in the same plane, and the primary optical system and the secondary optical system are respectively integrated in multiple arrays. A concentrating solar power generation module comprising a plate-like primary optical system array and a plate-like secondary optical system array. A concentrating solar photovoltaic power generation device, wherein the concentrating solar power generation module according to any one of claims 1 to 7 is mounted on a solar tracking device.

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