JP2009202697A - Photovoltaic power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photovoltaic power generation device capable of reducing influences of external causes under use environment accompanied with wind, waves, etc. <P>SOLUTION: The photovoltaic power generation device 1 includes a solar battery module 2 for generating power from solar light, a pedestal 3 having an upper face onto which the solar battery module 2 is provided, weight body 4 provided on the lower face of the pedestal 3 and below a center-of-gravity position of combination of the solar battery module 2 and pedestal 3 substantially in the vertical direction, a float body 5 provided in a lower face of the pedestal 3 and around the weight body 4, for providing buoyancy to the photovoltaic power generation device 1, and an outer wall portion 6 provided so as to cover the periphery of the lower face side of the pedestal 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solar power generation apparatus for water installation that is laid on the water of a lake, a dam, a water purification plant, or the like and generates generated power by sunlight.

  In the photovoltaic power generation apparatus, the output greatly depends on the area, and a large installation area is required to obtain a large amount of power. In order to secure the installation area of the solar power generation device, use of idle land in the city is being studied, but the land cost is high and it was difficult to secure the installation location in a wide area.

  Therefore, in recent years, water such as lakes and dams near the city center has been attracting attention as a place for installing a solar power generation device for high power use.

For example, Patent Document 1 discloses a solar power generation device that includes a float and a water purification mechanism.
JP-A-8-268383

  However, in the technique disclosed in Patent Document 1, the center of gravity collapses due to external factors such as wind and waves, and the photovoltaic power generation apparatus tends to overturn.

  The present invention has been devised to solve the problems in the conventional technology as described above, and an object of the present invention is to provide a photovoltaic power generation apparatus in which the influence of external factors such as wind and waves is reduced. That is.

The solar power generation device of one embodiment of the present invention is a solar power generation device installed on the water, a solar cell module that generates power by sunlight, a support base provided with the solar cell module on the upper surface, A weight body provided substantially vertically below the center of gravity of the solar cell module and the support base; and a lower surface of the support base and provided around the weight body; A floating body that provides buoyancy, and an outer wall provided to cover the outer periphery of the lower surface side of the support base,
It comprises.

  The inside of the outer wall portion on the water surface is preferably sealed from the outside so as to include air.

  The floating body is preferably provided along the outer periphery of the support base.

  It is preferable to further comprise a shaft connecting the weight body and the support base.

  The photovoltaic power generation apparatus which is one aspect of the present invention includes an outer wall portion provided to cover the outer periphery of the lower surface side of the support base together with the support base, the weight body, and the floating body. Since external factors such as wind and waves are controlled so as not to enter the outer wall portion, the overturning of the solar power generation device due to the external factors can be suppressed.

  Further, since the inside of the outer wall portion on the water surface is sealed from the outside so as to contain air, further buoyancy can be obtained by the air, so that the floating body can be reduced in size by the obtained buoyancy, and solar power generation The cost for the apparatus can be reduced.

  Since the floating body is provided along the outer periphery of the support base, the floating body has a structure that gives buoyancy to a portion far from the center of gravity of the solar power generation device (substantially central portion of the support base) The restoring force with respect to the force for rotating the device is maximized. Therefore, the solar power generation device can form a structure that is difficult to roll over.

  By further including a shaft that connects the weight body and the support base, the center of gravity of the solar power generation device including the weight body can be greatly lowered downward, and the solar power generation device is rotated. A large restoring force can be generated with respect to the force. Therefore, the solar power generation device can form a structure that is difficult to roll over.

  Although the solar power generation device of the embodiment of the present invention will be described based on the drawings, the present invention is not limited by these drawings.

  FIG. 1 is a cross-sectional view schematically showing a solar power generation device as an example of an embodiment of the present invention. FIG. 2 is a top view schematically showing a solar power generation device as an example of an embodiment of the present invention. FIG. 3 is a diagram showing an example of the structure of the solar cell module according to the present invention. 4 (a) and 4 (b) are bottom views showing an installation example of the floating body 5 in the solar power generation apparatus as an example of the embodiment of the present invention.

  DESCRIPTION OF SYMBOLS 1 is a solar power generation device, 2 is a solar cell module, 3 is a support stand, 4 is a weight body, 5 is a floating body, 6 is an outer wall part, 7 is the space enclosed by the support stand 3 and the outer wall part 6, 8 A shaft, 9 is a solar cell element, and A is a water surface.

  In addition, the electric power generated by the solar power generation device can be guided to the outside by a cable or the like (not shown). For example, power transmission to the outside means power transmission to another module or power transmission to land.

  A photovoltaic power generation apparatus 1 according to an example of an embodiment of the present invention includes a solar cell module 2, a support base 3, a weight body 4, a floating body 5, and an outer wall portion 6.

  As shown in FIG. 2, the solar cell module 2 is formed by arranging a plurality of solar cell elements that generate predetermined power. As the solar cell element, the type such as a polycrystalline silicon solar cell and a single crystal silicon solar cell is not limited.

  Examples of the solar cell module 2 include a configuration in which a plurality of solar cell elements are connected in series or in parallel and sealed with a resin between a translucent substrate and a back surface material.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the solar cell module 2, 11 is a translucent substrate, 12 is a light receiving surface side filler, 13 is a solar cell element, 14 is a back surface side filler, 15 is a back sheet, and 16 is a connection wiring.

  Hereinafter, each member will be described.

  As the translucent substrate 11, a substrate having high light transmittance made of glass, polycarbonate resin, or the like is used. As for the glass plate, white plate glass, tempered glass, double tempered glass, heat ray reflective glass and the like are used, but generally white plate tempered glass having a thickness of about 3 mm to 5 mm is used. On the other hand, when a substrate made of a synthetic resin such as polycarbonate resin is used, a substrate having a thickness of about 5 mm is often used.

  The light-receiving surface side filler 12 and the back surface side filler 14 are made of ethylene-vinyl acetate copolymer (EVA) or polyvinyl butyral (PVB), and are formed into a sheet shape having a thickness of about 0.4 to 1 mm by a T die and an extruder. The one molded into is used. These are heated and pressed under reduced pressure by a laminating apparatus, so that they are softened and fused to be integrated with other members.

  EVA or PVB may contain titanium oxide, pigment, or the like and be colored white or the like. However, in the light-receiving surface side filler 12 in the method for manufacturing a solar cell module according to the present invention, the solar cell element 13 is colored. It is transparent because the amount of light incident on it decreases and power generation efficiency decreases.

  Further, EVA or PVB used for the back surface side filler 14 may be transparent, or may be colored white or the like by containing titanium oxide, pigment, or the like in accordance with the surrounding installation environment where the solar cell module is installed.

  The solar cell element 13 is made of, for example, single crystal silicon or polycrystalline silicon having a thickness of about 0.3 to 0.4 mm and a size of about 150 mm square. Inside the solar cell element 13 is formed a PN junction in which a P layer containing a large amount of P-type impurities such as boron and an N layer containing a large amount of N-type impurities such as phosphorus are in contact. The electrode is formed of silver paste or the like by a screen printing method or the like. In addition, the surfaces of the electrodes provided on both surfaces thereof may be solder coated over almost the entire surface in order to easily attach the protection and connection tabs.

  As the back sheet 15, a weather-resistant fluorine-based resin sheet sandwiching an aluminum foil so as not to transmit moisture, a polyethylene terephthalate (PET) sheet deposited with alumina or silica, or the like is used.

  The connection wiring 16 electrically connects the solar cell elements, and is obtained by soldering a surface of the wiring material for connecting the solar cell elements such as copper foil by plating or dipping on the entire surface from about 20 to 70 μm. Is used. When a general 150 mm square polycrystalline silicon solar cell element is used, the connection wiring 16 has a width of about 1 to 3 mm and a length of about 260 to 290 mm.

  As for the support stand 3, the solar cell module 2 is provided in the upper surface. As the support 3, for example, a material having high stability against water, such as stainless steel, is used.

  The solar cell module 2 is fixed to the upper surface of the support base 3 by connecting parts such as bolts, for example.

  A weight body 4 and a floating body 5 are provided on the lower surface of the support base 3.

  In FIG. 1, the weight body 4 is connected to the support base 3 via the shaft 8, but the connection between the weight body 4 and the support base 3 is not limited to this.

  The weight body 4 is provided substantially vertically below the center of gravity where the solar cell module 2 and the support base 3 are combined. By forming such a configuration, the center of gravity can be further lowered while maintaining the balance of the photovoltaic power generation apparatus. The substantially vertical direction includes a slight deviation from the vertical direction, and a difference of ± 2 ° or less from the vertical direction with respect to the point where the lower surface of the support base and the vertical direction intersect is allowed.

  The fixing method of the shaft 8 and the support base 3 is not limited, For example, you may fix with a volt | bolt etc. and may be fixed by welding.

  As the material of the shaft 8, a material that has sufficient rigidity and is not deformed and destroyed even when the photovoltaic power generation device 1 moves up and down by wind or waves is used. Examples of the material include stainless steel and iron pillars coated with a material having low reactivity with water.

  The shaft 8 is preferably rod-shaped and longer than the height of the support 3. By securing such a length, the center of gravity of the solar power generation device 1 including the weight body 4 can be further lowered, so that a large restoration can be achieved with respect to the force for rotating the solar power generation device 1. Force can be generated, and the danger of rollover of the photovoltaic power generation apparatus 1 can be avoided.

  It is important that the weight 4 has a weight at which the position of the center of gravity of the photovoltaic power generator 1 is below the lower end of the support 3. By securing such a weight, the center of gravity of the photovoltaic power generation device 1 including the weight body 4 can be further lowered, so that a large restoration can be achieved with respect to the force for rotating the photovoltaic power generation device 1. Force can be generated, and the danger of rollover of the photovoltaic power generator 1 can be avoided. Moreover, since the inclination | tilt angle of the solar cell module 2 with respect to the water surface A does not change a lot before and after floating on water, the solar power generation device 1 which has desired generated electric power is obtained.

  Examples of the floating body 5 include a plastic tank in which air is sealed inside a waterproof resin. The floating body 5 may be a foamed resin material whose surface is covered with a waterproof resin film. The floating body 5 is connected to the support base 3 by sticking with an adhesive or the like, or fastening with a bolt or the like.

  The shape of the floating body 5 may be any shape that does not greatly change the cross-sectional area above and below the water surface A. Thereby, even if it is a case where the vertical motion of the water surface A arises, since a buoyancy does not change a lot, the solar power generation device 1 is stably hold | maintained on the water surface A.

  The floating body 5 is preferably provided on the outer peripheral side of the support base 3. Thereby, it becomes a structure which gives buoyancy intensively to the part far from the center of gravity of the photovoltaic power generation device 1, and the restoring force with respect to the force for rotating the photovoltaic power generation device 1 is maximized. Difficult structures can be realized.

  Specifically, the floating body 5 provided on the outer peripheral side of the support base 3 is, for example, a floating body continuously provided on the outer peripheral side of the support base 3 (see FIG. 4A), the outer peripheral side of the support base 3 Among them, floating bodies provided at the four corners of the support base 3 can be mentioned. Here, the “outer periphery side” means the vicinity of the outer periphery.

  The outer wall 6 is provided so as to cover the outer periphery on the lower surface side of the support 3. Thereby, since it controls so that the external factor in use environments, such as a wind and a wave, does not enter into an outer wall part, it becomes possible to suppress the pressure rise inside an outer wall. As a result, rollover of the solar power generation device can be suppressed. In addition, as the outer wall part 6, the thing of the material which has high stability with respect to water, such as stainless steel, is used, for example. Further, the outer wall 6 and the support 3 are fastened by, for example, bolts, and further, a sealing material such as silicone is provided between the outer wall 6 and the support 3 to improve the airtightness in the space. Can be improved.

  The inside of the outer wall 6 on the water surface A is preferably sealed from the outside so as to include air 7. Since further buoyancy is obtained by the air 7 inside the outer wall portion 6, the floating body can be reduced in size by the obtained buoyancy, and the cost of the solar power generation device can be reduced.

  In FIG. 1, the outer wall 6 is shown as a separate body from the support 3, but is preferably a part of the support 3. Since the outer wall portion 6 is a part of the support base 3, air can be sufficiently retained in the outer wall portion, and a process of fixing the outer wall portion 6 to the support base 3 with, for example, a bolt becomes unnecessary.

It is sectional drawing which shows an example of embodiment of the solar power generation device for water installation of this invention. FIG. 2 is a top view schematically showing a solar power generation device as an example of an embodiment of the present invention. It is a figure which shows an example of the structure of the solar cell module which concerns on this invention. (A) And (b) is a bottom view which shows the example of installation of the floating body in the solar power generation device of an example of the embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar power generation device 2 Solar cell module 3 Support stand 4 Weight body 5 Floating body 6 Outer wall part 7 Space 8 surrounded by the support stand 3 and the outer wall part 6 Shaft 9 Solar cell element 11 Translucent substrate 12 Light-receiving surface side sealing Stop material 13 Solar cell element 14 Back surface side sealing material 15 Back surface material 16 Connection wiring A Water surface

Claims (4)

A solar power generation device installed on the water,
A solar cell module that generates power by sunlight;
A support base provided with the solar cell module on the upper surface;
A weight body provided on the lower surface of the support base, substantially vertically below the center of gravity of the solar cell module and the support base,
A floating body that is provided on the lower surface of the support base and around the weight body, and that provides buoyancy to the solar power generation device;
An outer wall provided to cover the outer periphery of the lower surface side of the support base;
A solar power generation apparatus comprising:   The solar power generation device according to claim 1, wherein the inside of the outer wall portion on the water surface is sealed from the outside so as to include air.   The solar power generation apparatus according to claim 1, wherein the floating body is provided along an outer periphery of the support base.   The solar power generation device according to any one of claims 1 to 3, further comprising a shaft that connects the weight body and the support base.

Images