JP2000227573A - Light condenser for solar light generation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high light condensability even in the case of a bad weather condition, such as in a slightly cloudy day, by arranging a concave mirror near the circumference of a solar battery array and arranging a reflection mirror which irradiates the reflected light from the concave mirror to a module of the solar battery array. SOLUTION: A homing device 1 for orienting the front surface of a homing stand 2 toward the sun the all times is arranged and the solar battery array 3 which is a DC generator including a module group and the connection wiring and protector thereof is arranged in the central part of the homing stand 2. The concave mirrors 4 formed to parabola surfaces are respectively installed at the plural positions, for example, four points, near the circumference of the solar battery array 3 of the homing stand 2. Further, reflected light regulators 6 are respectively arranged at supporting frames in correspondence to the respective concave mirrors 4. Reflection mirrors 7 for reflecting the reflected light from the concave mirrors 4 via these reflected light regulators 6 and irradiating the solar battery array 3 with the reflected light are disposed near the focal positions of the concave mirrors 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation concentrator capable of concentrating sunlight more efficiently.

[0002]

2. Description of the Related Art A solar cell array in which a plurality of modules each having a plurality of cells are arranged side by side may be mounted on a tracking device which constantly faces a light receiving surface to the sun for the purpose of efficiently condensing light. As described above, even when the solar cell array is mounted on the tracking device, there is a problem that the power generation capacity is inevitably reduced when it is slightly cloudy or cloudy. As a solution to this, it is conceivable to project the reflected light on a light receiving surface using a reflecting mirror or the like.

[0003]

However, since the reflected light projected from the reflecting mirror is obliquely incident on the light receiving surface, there is a problem that the light-collecting ability does not increase so much as the equipment becomes larger. An object of the present invention is to solve the above-mentioned problems and to provide a solar power generation light concentrating device capable of obtaining a high light condensing ability even in bad weather conditions such as light cloudiness.

[0004]

According to a first aspect of the present invention, a solar cell array is disposed on a tracking pedestal of a tracking device, and a concave mirror is disposed near the periphery of the solar cell array. A reflector for irradiating the solar cell array module with light reflected from the concave mirror is arranged near the focal position of the concave mirror.

[0005] According to the above structure, since the reflected light radiated from the concave mirror through the reflecting mirror can be received together with the sunlight directly incident on the light receiving surface of the solar cell array, the light condensing ability can be greatly improved. In particular, it is possible to effectively use the power generation capacity of the facility by increasing the power generation output during light cloudiness or cloudy weather.

According to a second aspect of the present invention, in the above configuration, a reflecting mirror is disposed via a reflected light adjusting device capable of changing an installation angle or an installation position, and a temperature for detecting a temperature of a module of the solar cell array is provided. And a reflection light control device for adjusting the amount of reflected light to the module by operating the reflection mirror adjustment device based on the detection value of the thermometer. According to the above configuration, when the temperature inside the module of the solar cell array rises due to an excessive amount of condensed light, for example, on a fine day, the output of the module decreases, so that the amount of reflected light irradiation is adjusted by the light receiving amount control device. Thus, the temperature inside the module can be prevented from rising, and the output can be prevented from decreasing.

According to a third aspect of the present invention, a tracking device is installed near the periphery of a solar cell array installed on a fixed base, and a tracking mirror of the tracking device is provided with a concave mirror and a focus mirror near the focal position of the concave mirror. A reflector that is disposed and reflects the reflected light from the concave mirror, and a reflector adjustment device that can adjust the angle of the reflector so as to reflect the reflected light from the concave mirror and irradiate the solar cell array, The tracking device and the reflector adjusting device are configured to be driven and controlled such that the reflected light from the reflector is always irradiated to the solar cell array module. According to the above configuration, since the reflected light emitted from the concave mirror via the reflecting mirror can be received together with the sunlight directly incident on the light receiving surface of the solar cell array, it is possible to greatly improve the light collecting ability, In particular, the power generation capacity of the facility can be effectively exhibited by increasing the power generation capacity during light cloudiness or cloudy weather. Further, since only the concave mirror is driven for tracking, it becomes possible with a small tracking device.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a thermometer for detecting a temperature of a module of the solar cell array, and a reflecting mirror adjusting device is operated based on a detected value of the thermometer. And a reflected light control device for adjusting the amount of reflected light to the light receiving surface. According to the above configuration, when the temperature inside the module of the solar cell array rises due to an excessive amount of condensed light, for example, on a fine day, the output of the module decreases, so that the amount of reflected light irradiation is adjusted by the light receiving amount control device. Thus, the output can be prevented from lowering.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, a first embodiment of a concentrator for photovoltaic power generation according to the present invention will be described with reference to FIGS. As shown in FIG. 1, a tracking device 1 for always directing the tracking gantry 2 toward the sun is disposed. As shown in FIG. 2, a module 3 is provided at the center of the tracking gantry 2.
The solar cell array 3 which is a DC power generation device including the group a, its connection wiring, and a protection device is arranged. The concave mirrors 4 formed on the parabolic surface are respectively installed at a plurality of positions near the periphery of the solar cell array 3 of the tracking gantry 2, for example, at four positions as shown in the figure. Further, the support frame 5 includes
A reflected light adjusting device 6 is arranged corresponding to each concave mirror 4, and a reflecting mirror 7 that reflects the reflected light from the concave mirror 4 and irradiates the solar cell array 3 via the reflected light adjusting device 6.
Are provided near the focal position of the concave mirror 4. The reflecting mirror 7 may be a plane mirror, a concave mirror or a convex mirror. Further, as shown in FIG. 4, a convex or concave or frosted glass irregular reflection surface 7a is formed in the peripheral portion,
You may comprise so that only the effective reflection surface 7b of a center part may reflect normally.

Therefore, the tracking device 1 allows the solar cell array 3 to receive the light DR directly from the sun and to receive the reflected light RR of the concave mirror 4 through the reflecting mirror 7, especially in cloudy weather or light cloudy weather. In addition, the power output of the solar cell array 3 can be greatly increased.

Further, as shown in FIG. 3, the reflected light adjusting device 6 adjusts the front-back (or left-right) position of the reflecting mirror 7 so that reflected light exceeding the effective reflecting surface 7b is incident.
The amount of reflected light RR can be adjusted by reducing the amount of reflected light RR. The solar cell array 3 is provided with a thermometer 8 for measuring the temperature of the module 3a (the internal temperature is optimal, but the internal temperature may be estimated from the surface temperature). Reflected light adjusting device 6 based on the value
And a reflected light control device 9 that adjusts the amount of reflected light RR applied to the solar cell array 3 is provided. That is, when the internal temperature of the module 3a of the solar cell array 3 rises, not only does the output decrease, but also the deterioration, cracking, and failure of the material such as deterioration of insulation resistance and disconnection of the interconnector may occur. For this reason, in the reflected light control device 9, when the temperature of the module 3a exceeds a certain value, the reflected light adjusting device 6 moves the reflecting mirror 7 backward, for example, so that the reflected light from the concave mirror 4 becomes wider than the effective reflection surface 7b. The module 3a is moved to a distant position, thereby reducing the amount of the reflected light RR to suppress a rise in the temperature inside the module 3a.

As a modified example of the reflected light adjusting device 6, as shown in FIG. 5, a reflected light adjusting device 6 'for adjusting the mounting angle of the reflecting mirror 7 may be used. In this case, the amount of the reflected light RR is an on-off operation because the local light reception of the module 3a may cause damage to the device.

According to the first embodiment, the tracking device 1 can always receive the direct light DR from an efficient angle and can receive the reflected light received by the concave mirror 4 through the reflecting mirror 7. In particular, it is possible to generate a high output power by increasing the amount of received light when light cloudy or cloudy.

The temperature inside the module 3a is detected by the thermometer 8, and the reflected light controller 9 drives the reflected light adjusting device 6 to move the reflecting mirror 7, thereby controlling the amount of the reflected light RR. Therefore, it is possible to suppress a rise in the temperature inside the module 3a, and to prevent a deterioration, a crack, or a failure of a material such as a decrease in output, a deterioration in insulation resistance, a disconnection of an interconnector, and the like.

FIG. 6 shows a second embodiment, in which the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the first embodiment, since the solar cell array 3 and the concave mirror 4 are arranged on the same tracking gantry 2, the tracking device 1 tends to be large, but in the second embodiment, the solar cell By fixing the array 3 and mounting only the concave mirror 4 on the tracking gantry 12 of the tracking device 11,
The size of the tracking device 11 can be reduced.

That is, the solar cell array 3 is mounted on the fixed base 1.
The concave mirror 4 is arranged on a tracking gantry 12 of a tracking device 11 which is installed on the camera 3 and is arranged at four locations around the mirror. Further, the tracking base 12 is provided with a reflected light adjusting device 6 and a reflecting mirror 7 via a support frame (not shown). According to the above configuration, the same effects as those of the first embodiment can be obtained, and the tracking device 11 can be used.
Can be reduced in size.

[0017]

As described above, according to the first aspect of the present invention, it is possible to receive the reflected light emitted from the concave mirror via the reflecting mirror together with the sunlight directly incident on the light receiving surface of the solar cell array. Therefore, the light-gathering ability can be greatly improved, and the power-generating capacity of the facility can be effectively used by increasing the power generation output particularly in light cloudy or cloudy weather.

According to a second aspect of the present invention, in the above configuration, according to the reflected light adjusting device in which the installation angle or the installation position can be changed, the amount of condensed light is too large in a sunny day or the like, and the module of the solar cell array is When the internal temperature increases, the output decreases. Therefore, by adjusting the irradiation amount of the reflected light by the received light amount control device, it is possible to prevent the internal temperature of the module from increasing and prevent the output from decreasing.

According to the third aspect of the present invention, since the reflected light irradiated from the concave mirror through the reflecting mirror can be received together with the sunlight directly incident on the light receiving surface of the solar cell array, the condensing ability can be improved. The power generation capacity can be significantly improved, and the power generation capacity of the facility can be effectively exhibited by increasing the power generation capacity particularly in light cloudiness or cloudy weather. Further, since only the concave mirror is driven for tracking, it becomes possible with a small tracking device.

Further, according to the invention described in claim 4,
When the temperature inside the module of the solar cell array rises due to too much condensed light, such as on a sunny day, the output of the module decreases, so that the output of the reflected light is adjusted by the light receiving amount control device to prevent the output from decreasing. be able to.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a concentrator for photovoltaic power generation according to the present invention.

FIG. 2 is a perspective view showing a tracking gantry of the concentrator for photovoltaic power generation.

FIG. 3 is an explanatory diagram showing functions of a reflected light adjusting device of the concentrating device for photovoltaic power generation.

FIG. 4 is a perspective view showing a modification of the reflecting mirror of the concentrator for photovoltaic power generation.

FIG. 5 is an explanatory view showing a modification of the reflected light adjusting device of the concentrating device for photovoltaic power generation.

FIG. 6 is a configuration diagram showing a second embodiment of the concentrator for photovoltaic power generation according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tracking device 2 tracking gantry 3 solar cell array 3 a module 4 concave mirror 5 supporting frame 6 reflected light adjusting device 7 reflecting mirror 8 thermometer 9 reflected light control device 11 tracking device 12 tracking gantry 13 fixed gantry

Claims (4)

[Claims] 1. A solar cell array is arranged on a tracking base of a tracking device, and a concave mirror is arranged near the periphery of the solar cell array. Reflected light from the concave mirror is reflected near a focal position of the concave mirror. A concentrator for photovoltaic power generation, wherein a reflecting mirror for irradiating the module is arranged. 2. A thermometer for detecting a temperature of a module of a solar cell array, wherein a reflecting mirror is disposed via a reflected light adjusting device capable of changing an installation angle or an installation position, and based on a detection value of the thermometer. The condensing device for photovoltaic power generation according to claim 1, further comprising a reflected light control device that operates the reflecting mirror adjusting device to adjust the amount of reflected light to the module. 3. A tracking device is installed in the vicinity of a solar cell array installed on a fixed base, and a concave mirror is disposed on the tracking base of the tracking device, and a reflection from the concave mirror is disposed near a focal position of the concave mirror. A reflecting mirror for reflecting light, and a reflecting mirror adjusting device capable of adjusting the angle of the reflecting mirror so as to reflect the reflected light from the concave mirror and irradiate the solar cell array, are arranged; A concentrating device for photovoltaic power generation, wherein the device is configured to be driven and controlled such that light reflected from a reflecting mirror is constantly irradiated to a module of a solar cell array. 4. A thermometer for detecting a temperature of a module of a solar cell array, and a reflected light control device for operating a reflecting mirror adjusting device based on a detected value of the thermometer to adjust the amount of reflected light to a light receiving surface. 4. The concentrator for photovoltaic power generation according to claim 3, wherein: