JP2005223164A - Photovoltaic power generation system and installation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar light power generation system and its installation method capable of realizing solar light power generation installation hardly having installation azimuth dependency, and of hereby effectively utilizing the house top of a building or the like because a yearly power generation amount is increased, e.g., by 120 % (this changes depending on points) compared with one side face light reception south directed optimum inclination-equipped installation, although the yearly power generation amount is decreased as an installation azimuth is shifted from the south in optimum inclination-installation (e.g., 30°) of a conventional one side face light reception solar cell. <P>SOLUTION: A double-sided light reception solar cell is installed at an inclination angle where the total sum of a yearly power generation amount by surface light reception and rear surface light reception is maximum. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a photovoltaic power generation system and an installation method thereof.

  Conventional solar cells generally have a method in which a single-sided light receiving module that generates power by receiving light from a light receiving surface is installed at an optimum southward inclination angle. In this method, the annual power generation amount decreases as the installation azimuth angle deviates from the south, and when it faces the east or west surface, it decreases to about 70% of that at the south surface installation. Therefore, when installing solar cells on the building rooftop, etc., the orientation of the building etc. is restricted, and if the installation orientation deviates from the south direction, or the south direction is concerned, the number of installed modules is not limited. The landscape is also disadvantageous. Such a conventional technique is disclosed in Japanese Patent Laid-Open No. 2002-76415.

JP 2002-76415 A

  The present invention greatly relaxes the above-mentioned restrictions on installation, and makes it possible to effectively use the space regardless of the direction of the building or the like.

  In addition, when the double-sided solar cell is installed at the optimum inclination angle defined by a normal single-sided solar cell, a large annual power generation of about 15% (depending on the location) can be obtained compared to the single-sided solar cell. With the amount of power generation increase, there is no merit of applying a double-sided solar cell that is more expensive than a single-sided solar cell. The present invention provides a photovoltaic power generation system that maximizes the capability of a double-sided light receiving solar cell and a method for installing the photovoltaic power generation system.

  The present invention relates to a solar power generation system including a double-sided solar cell module that generates power by receiving light from the front surface and the back surface. The double-sided light receiving solar cell module is installed at an inclination angle that maximizes the sum (hereinafter referred to as a double-sided solar cell optimum inclination angle).

  In addition, the photovoltaic power generation system of the present invention maintains the installation azimuth angle of the double-sided solar cell module installed at the optimum inclination angle of the double-sided solar cell, while maintaining the annual power generation amount almost constant. The installation azimuth angle is set according to the installation conditions.

  Moreover, the photovoltaic power generation system of the present invention is characterized in that, in the above-described photovoltaic power generation system, a fence-integrated or handrail-integrated double-sided light receiving module is vertically installed around the facility location.

  Moreover, the solar power generation system of this invention has arrange | positioned the said double-sided light reception solar cell module on a building roof as a facility place, It is characterized by the above-mentioned.

  Furthermore, the present invention relates to a method for installing a solar power generation system including a double-sided light receiving solar cell module that generates power by receiving light from the front and back surfaces. The double-sided light-receiving solar cell module is installed at an inclination angle (hereinafter referred to as a double-sided light-receiving solar cell optimum inclination angle) that maximizes the sum of the annual power generation.

  Further, in the installation method of the photovoltaic power generation system of the present invention, the installation azimuth angle of the double-sided solar cell module installed at the optimum inclination angle of the double-sided solar cell, while maintaining the annual power generation amount almost constant, The installation azimuth angle is set according to the installation conditions of the facility location.

  The solar power generation system installation method of the present invention is characterized in that, in the solar power generation system installation method described above, a fence-integrated or handrail-integrated double-sided light receiving module is vertically installed around the facility location. It is.

  Moreover, in the installation method of the solar power generation system of this invention, the said double-sided light reception solar cell module is arrange | positioned as a facility place on a building roof.

  According to the present invention, it is possible to provide a solar power generation facility that maximizes the annual power generation generated by the double-sided light-receiving solar cell, and about 120% when the single-sided light-receiving solar cell is installed at an optimum inclination toward the south (varies depending on the installation point). Annual power generation.

  In addition, according to the present invention, when the building is installed on the roof, etc., there is almost no azimuth angle dependency of the annual power generation amount, so that the solar cell can be installed in alignment with the direction of the building regardless of the direction of the building, and the space can be used effectively. At the same time, it is possible to improve the landscape of the building rooftop including solar power generation facilities. Furthermore, by combining with a building rooftop integrated double-sided light receiving power generation facility disclosed in JP-A-2002-76415, a fence-integrated double-sided light receiving photovoltaic power generation facility to be installed around the building rooftop and a roof space portion in a building direction. It is possible to install a solar power generation facility with a double-sided light receiving optimum tilt mount installed together, and to provide a solar power generation facility that can make maximum use of the building roof space.

  In addition, when the present invention is applied to a snowfall area, the inclination angle that can prevent snow accumulation on the solar cell module is about 60 °, but the optimum inclination angle of the double-sided light-receiving solar cell of the present invention is equivalent to this angle or Therefore, according to the photovoltaic power generation system and its installation method of the present invention, it is possible to obtain an annual power generation amount of about 125% with respect to a single-sided light receiving solar cell while preventing snow on the solar cell. It becomes.

  Examples of the present invention will be described below. FIG. 1 shows a double-sided solar cell module (a) applied to the present invention in comparison with a conventional single-sided solar cell module (b). The double-sided light-receiving solar cell module has a structure in which a string in which double-sided light-receiving solar cells 1 are connected in series with a ribbon wire 7 is sealed between a surface glass protective material 3 and a transparent backsheet 4 with a sealing material 6. The solar cell module (+) terminal 8 and (−) terminal 9 are provided. On the other hand, the conventional single-sided light-receiving solar cell module is different only in that the single-sided light-receiving solar cell 2 is used as a solar cell and the white or other opaque backsheet 5 is used as a backsheet.

FIG. 2 shows a solar cell module mounting system. The gantry 11 is assembled on the foundation 12, and the solar cell modules 10 are mounted side by side with an inclination angle (θ) on the gantry. The equipment composed of the foundation 12, the gantry 11, the solar cell module 10 and the like is called a solar cell array. In the prior art, a single-sided light receiving type is used for the solar cell module, and the solar cell module 10 has an optimum southward inclination (for example, θ =
30 °). When the double-sided light receiving solar cell module is installed on a stand, the installation method is exactly the same.

  FIG. 3 is a diagram showing the relationship between the installation azimuth angle / inclination angle of the solar cell and the annual movement of the sun. In the double-sided light receiving solar cell, it can be seen that in the summer, in the morning and evening when the solar altitude is low, direct light enters in addition to scattered light and reflected light even when it is installed facing south. Further, when the azimuth advances from the south to the east (or west), direct light in the afternoon (or morning) is irradiated on the back side in addition to the summer.

  Fig. 4 shows a simulation of the total amount of annual power generation from the front-surface incident light and back-surface incident light of the double-sided solar cell module at the location of Sapporo City (latitude 43.03, longitude 141.21). The result is shown. In this calculation, the installation direction is south (the direction of the front surface of the double-sided light receiving module), and the inclination angle is changed. In addition, the conversion efficiency of double-sided solar cells has different properties between front and back irradiation. The ratio of conversion efficiency during backside irradiation to conversion efficiency during front surface irradiation (bifaciality: Bifaciality is defined in 3 cases from 0.7 to 1.0. The vertical axis in the figure is a numerical value normalized by the annual power generation when the single-sided light receiving solar cell module having the same conversion efficiency as the front surface efficiency of the double-sided light receiving solar cell module is installed at an optimal inclination (40 °). Show. As can be seen from the figure, regardless of the bifaciality in this range, the maximum annual power generation can be obtained at an inclination angle of 60 °, and when the bifaciality is 80%, the annual power generation of 120% with the optimal inclination installation of the single-sided light receiving module. It can be seen that the quantity is obtained. In the solar cell array shown in FIG. 2, the present invention is installed such that the inclination angle θ is near the optimum inclination angle at which the maximum annual power generation amount at the double-sided solar cell at that point is obtained.

  FIG. 5 shows the case where the azimuth angle is swung from south (0 °) to east-west (± 90 °) under the conditions of the optimum double-sided light receiving inclination angle (60 °) and bifaciality 80% obtained in the above simulation. The result of simulating the change of annual power generation is shown. As can be seen from the figure, there is almost no change up to the azimuth angle of ± 45 °, and the decrease is only about 5% even at ± 90 °. That is, it is understood that the present invention can provide a solar power generation facility that can obtain the maximum annual power generation amount regardless of the installation direction by installing the double-sided light receiving solar cell at the optimum double-sided light receiving inclination angle calculated at the installation point.

  FIG. 6 shows the optimum inclination installation (30 °) and vertical installation (90 °) of the single-sided light receiving solar cell and the optimum inclination of the double-sided light receiving solar cell at the position of the simulation point Mito city (latitude 36.22, longitude 140.28). It shows the result of calculating the installation orientation dependence of the annual power generation for the four cases of installation (50 °) and vertical installation. Regarding the vertical installation method of the double-sided light receiving solar cell, as shown in Japanese Patent Laid-Open Nos. 2001-358353 and 2002-76415, as can be seen from FIG. The annual power generation is almost constant regardless of the installation azimuth. Therefore, for example, a building roof fence-integrated double-sided light receiving photovoltaic power generation facility can generate a maximum annual power generation amount regardless of the direction of the building. On the other hand, when the optimum inclination angle of a double-sided solar cell (in this case 50 °) is installed, if the azimuth is within ± 45 ° from true south, the annual power generation is constant and the single-sided solar cell is optimal for the south A value close to 120% at the time of tilt installation is shown. That is, if the present invention is applied, a large-capacity solar cell is formed by combining a double-sided light-receiving solar cell with a fence-integrated type and a stand-mounted type (double-sided light receiving optimum inclination installation) regardless of the building orientation in a limited space such as a building rooftop. Photovoltaic facilities can be installed.

  FIG. 7 shows a case where the above-mentioned embodiment is installed on the roof of a building, and (a) a conventional installation example of a single-sided light-receiving solar cell and (b) a comparison example of the double-sided light-receiving solar cell installation method of the present invention. It is. In this case, it is assumed that the direction of the building is deviated by 45 ° from true south. In FIG. 1A, the single-sided solar cell array 14 is arranged on the building rooftop 13 in the south direction. Therefore, the array which can be installed is also limited in arrangement, and the array is different from the direction of the building, which is not preferable in view of the landscape. On the other hand, in the embodiment of the present invention shown in FIG. (B), the double-sided light receiving fence integrated solar cell array 15 has no orientation dependency and can be installed in a space around the building. In addition to the array 15, the double-sided light receiving stand installation solar cell array 16 is installed in the vicinity of the double-sided light receiving optimum inclination angle along the building installation direction. As a result, the array 16 has no azimuth dependency, so the maximum annual power generation amount can be obtained, and by using both methods in combination, it is possible to effectively utilize the limited building rooftop and obtain the maximum power generation capacity. It becomes possible.

The figure explaining the structure of the double-sided light reception solar cell module to which this invention is applied. The figure explaining the structure of the mount installation solar cell array to which this invention is applied. The figure explaining how the back surface of the double-sided solar cell module used in the present invention receives direct light in the season. The figure explaining the inclination angle dependence of the annual power generation amount of the double-sided light receiving solar cell which is the base of the present invention. The figure explaining the azimuth | direction dependence of the annual power generation amount in the optimal inclination angle of the double-sided light reception solar cell used as the base of this invention. The figure explaining the azimuth | direction dependence of the annual electric power generation in the characteristic inclination angle of the double-sided light reception solar cell used as the base of this invention, and a single-sided light reception solar cell. The figure explaining that a double-sided light reception solar cell can be effectively installed on a building roof as an Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Double-sided light reception photovoltaic cell, 2 ... Single-sided light reception photovoltaic cell, 3 ... Solar cell module glass protective material, 4 ... Solar cell module transparent back sheet, 5 ... Solar cell module white back sheet, 6 ... Sealing material, 7 DESCRIPTION OF SYMBOLS Ribbon electric wire, 8 ... Solar cell module (+) terminal, 9 ... Solar cell module (-) terminal, 10 ... Solar cell module, 11 ... Mount, 12 ... Foundation, 13 ... Building rooftop, 14 ... Single-sided light receiving solar cell array 15 ... Double-sided light receiving fence integrated solar cell array, 16 ... Fixed installation double-sided light receiving solar cell array.

Claims (8)

In a solar power generation system including a double-sided light-receiving solar cell module that generates power by receiving light from the front surface and the back surface,
The double-sided light-receiving solar cell at an inclination angle (hereinafter referred to as a double-sided light-receiving solar cell optimum inclination angle) that maximizes the sum of annual power generation by front-side light reception and annual power generation by back-side light reception of the double-sided light-receiving solar cell module A photovoltaic power generation system characterized by installing modules. The solar power generation system of claim 1,
The installation azimuth of the double-sided solar cell module installed at the optimum inclination angle of the double-sided solar cell was set according to the installation conditions of the facility location while keeping the annual power generation amount almost constant. A solar power generation system characterized by that. In the photovoltaic power generation system according to claim 1 or claim 2,
A photovoltaic power generation characterized in that a fence-integrated or handrail-integrated double-sided light receiving module is vertically installed around a facility location, and the double-sided photovoltaic module shown in claim 1 or 2 is installed at the facility location. system. In the photovoltaic power generation system according to claim 2 or claim 3,
The solar power generation system, wherein the double-sided light-receiving solar cell module is arranged on a building roof as the facility location. In the installation method of the solar power generation system including the double-sided solar cell module that generates power by receiving light from the front surface and the back surface,
The double-sided light-receiving solar cell at an inclination angle (hereinafter referred to as a double-sided light-receiving solar cell optimum inclination angle) that maximizes the sum of annual power generation by front-side light reception and annual power generation by back-side light reception of the double-sided light-receiving solar cell module A method for installing a photovoltaic power generation system, characterized by installing a module. In the installation method of the solar power generation system of Claim 5,
The installation azimuth of the double-sided solar cell module installed at the optimum inclination angle of the double-sided solar cell was set according to the installation conditions of the facility location while keeping the annual power generation amount almost constant. The installation method of the solar power generation system characterized by the above-mentioned. In the installation method of the solar power generation system of Claim 5 or Claim 6,
A photovoltaic power generation characterized in that a fence-integrated or handrail-integrated double-sided light receiving module is vertically installed around a facility location, and the double-sided photovoltaic module shown in claim 1 or 2 is installed at the facility location. How to install the system. In the installation method of the solar power generation system of Claim 6 or Claim 7,
The solar power generation system installation method, wherein the double-sided solar cell module is arranged on a building roof as the facility location.

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