JP6259266B2 - Solar panel shading system - Google Patents

Description

The present invention relates to a light shielding system for a solar panel that prevents a fire of the solar panel by shielding the surface of the solar panel when there is an abnormality in the solar panel.
In addition, when it says a solar panel in this specification etc., the required number of solar cells are put together, a solar cell module configured by protecting with a resin, tempered glass, or a metal frame, and a plurality of solar cell modules in series. It includes a solar cell string configured to be connected.

In a general residential solar power generation system, a solar panel is installed on the roof of a house, and the output from the solar panel is connected to a power conditioner via a relay terminal box, so that desired power can be obtained. (For example, refer patent document 1).
Recently, large-scale solar power generation with an output of more than 1 megawatt (1000 kilowatts) called a mega solar has been carried out.

JP 2013-110290 A

  When an abnormality occurs in the solar panel, inspection work is required, but power generation does not stop as long as sunlight continues to hit the solar panel. In particular, mega solar systems installed in remote areas are generally operated by unmanned operation, so that power generation continues in an abnormal state until the arrival of staff, and in some cases, problems such as fires become serious. Can be considered.

  The present invention has been made to solve such a problem, and provides a solar panel shading system capable of preventing an abnormality from becoming serious and causing a fire or the like when an abnormality occurs in the solar panel. The purpose is to provide.

( 1 ) A shading system for a solar panel according to the present invention includes a plurality of solar panels connected in series, and a bypass diode that bypasses the solar panel in which the current flowing through each solar panel is abnormal. Provided with a light shielding device that shields the panel surfaces of the plurality of solar panels, an abnormality detection unit that is installed for each solar panel and detects an abnormality of the solar panel, and an abnormality is detected by the abnormality detection unit. Control means for operating the light-shielding device when
The light-shielding device comprises a light-shielding curtain that covers the surface of each solar panel, and curtain unfolding means that unfolds the light-shielding curtain,
When the abnormality is detected by the abnormality detection means, the control means shields only the solar panel in which the abnormality is detected, and then confirms the failure of the bypass diode, and if a current flows through the bypass diode The bypass diode is determined to be normal and maintained in its state, and if no current flows through the bypass diode , the bypass diode is determined to be faulty and all the plurality of solar panels are shielded from light. The light shielding device is operated.

( 2 ) Further, the solar panel shading system according to the present invention includes a plurality of solar panels connected in series, and a bypass diode that bypasses the solar panels in which the current flowing through each solar panel is abnormal. A light-shielding device that shields the panel surfaces of a plurality of solar panels, an abnormality detection unit that is installed for each solar panel and detects the abnormality, and when an abnormality is detected by the abnormality detection unit Control means for operating the shading device,
The light shielding device comprises a light shielding agent containing a thixotropic light shielding agent, wherein a swellable layered clay mineral made of smectite or bentonite and a light shielding pigment are dispersed in water, and communicated with the light shielding agent containing portion. A radiation path forming member having a radiation nozzle at the tip and forming a radiation path from the light shielding agent storage part to the radiation nozzle, an on-off valve for opening and closing the radiation path in the radiation path forming member, and the light shielding agent Pressurizing means for applying a pressure for applying a radiation force to the light-shielding agent of the storage unit,
The control means controls opening / closing of the on-off valves so as to shield all the plurality of solar panels when an abnormality is detected by the abnormality detection means.

  In the present invention, a light-shielding device that shields the panel surface of the solar panel, an abnormality detection unit that detects an abnormality of the solar panel, a control unit that operates the light-shielding device when an abnormality is detected by the abnormality detection unit, With this, when an abnormality occurs in the solar panel, it is possible to stop the power generation by shielding the solar panel and prevent the occurrence of a fire.

It is explanatory drawing of the structure of the light-shielding system of the solar panel which concerns on one embodiment of this invention, Comprising: The whole string comprised with a several solar panel is illustrated. It is explanatory drawing about especially the structure of a string among solar panels. It is explanatory drawing of the light-shielding apparatus of the light-shielding system of the solar panel which concerns on one embodiment of this invention (the 1). It is explanatory drawing of the light-shielding apparatus of the light-shielding system of the solar panel which concerns on one embodiment of this invention (the 2). It is operation | movement explanatory drawing of the light-shielding apparatus of the light-shielding system of the solar panel which concerns on one embodiment of this invention. It is explanatory drawing of the one aspect | mode of the abnormality which generate | occur | produces in a solar panel. It is operation | movement explanatory drawing of the light-shielding system of the solar panel which concerns on one embodiment of this invention. It is another operation explanatory view of the shading system of the solar panel shown in FIG. It is explanatory drawing about the reason for performing the operation | movement shown in FIG. It is explanatory drawing of the other aspect of the light-shielding apparatus of the light-shielding system of the solar panel which concerns on one embodiment of this invention (the 1). It is explanatory drawing of the other aspect of the light-shielding apparatus of the light-shielding system of the solar panel which concerns on one embodiment of this invention (the 2). It is explanatory drawing of the other aspect (link-type light-shielding device) of the light-shielding device of the light-shielding system of the solar panel which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the link type light-shielding apparatus of FIG. It is explanatory drawing of the further another aspect (airbag type light-shielding device) of the light-shielding device of the light-shielding system of the solar panel which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the airbag type light-shielding apparatus of FIG. It is explanatory drawing of the light-shielding device (radiation-type light shielding device) of the light-shielding system of the solar panel which concerns on other embodiment of this invention. It is operation | movement explanatory drawing of the radiation-type light-shielding apparatus of FIG.

[Embodiment 1]
As shown in FIG. 1, a light shielding system 1 for a solar panel according to an embodiment of the present invention (hereinafter simply referred to as “light shielding system 1”) includes a light shielding device 3 that shields a panel surface of a solar panel 9. , An abnormality detection means 5 for detecting an abnormality of the solar panel 9 and a control means 7 for operating the light shielding device 3 when an abnormality is detected by the abnormality detection means 5.
Since the shading system 1 is used for the solar panel 9, the solar panel 9 will be first described before the shading system 1 is described.

<Solar panel>
As shown in FIG. 2, the solar panel 9 is a module (module) in which a plurality of cells 11 (solar cell elements) are collected into a single panel (module) and connected to the adjacent solar panel 9 or the like. A box 13 is provided.
In this Embodiment, as shown in FIG.1 and FIG.2, the string is comprised by connecting the four solar panels 9 installed in the mount frame 15 in series via the junction box 13. As shown in FIG. . As shown by a thick line in FIG. 2, the current flows through the cells 11 of each solar panel 9 to the adjacent solar panel 9.

Inside the junction box 13, when an abnormality occurs such as when a shadow such as a tree is applied to the cell 11 or when a failure or malfunction occurs, the current flowing through each solar panel 9 is A bypass diode 13a is provided that bypasses the solar panel in which an abnormality has occurred and prevents a decrease in power generation efficiency of the entire string.
The bypass diode 13a bypassing the solar panel will be described by taking as an example the solar panel 9 at the front stage, the solar panel 9 at the rear stage, and the solar panel 9 at the rear stage with respect to the flow of current. In normal times, the resistance value of the bypass diode 13a is set higher than the resistance value of the solar panel, so that the current generated by the solar panel 9 in the front stage flows to the solar panel 9 in the rear stage, Current does not flow.
On the other hand, for example, when a shadow is applied to the latter-stage solar panel 9, the resistance value of the latter-stage solar panel increases and becomes higher than the resistance value of the bypass diode 13a. It flows through the bypass diode 13a without flowing to the solar panel 9 at the subsequent stage, and further flows into the solar panel 9 at the subsequent stage.
Each solar panel 9 has its power generation measured by an ammeter (not shown).

  Next, each structure (the light-shielding device 3, the abnormality detection means 5, the control means 7) of the light-shielding system 1 of the solar panel which concerns on one embodiment of this invention is demonstrated in detail.

<Shading device>
As shown in FIG. 1, the shading device 3 is installed on the upper side of each solar panel 9, and as shown in FIGS. 3 to 5, a shading curtain for covering and shielding the panel surface of the solar panel 9. 19, a winding shaft 21 that winds up the light-shielding curtain 19, a housing 23 (see FIG. 5) that houses the light-shielding curtain 19 in a wound state, and a motor that rotates the winding shaft 21 to deploy the light-shielding curtain 19 25.
Hereinafter, each part of the light-shielding device 3 will be described in detail.

≪Shading curtain≫
The light-shielding curtain 19 has a curtain shape with high light-shielding properties, and is large enough to cover the panel surface of the solar panel 9 when deployed. The light shielding curtain 19 is preferably a black system that absorbs light or a white system that reflects light.
Normally, the light-shielding curtain 19 is wound around the winding shaft 21 as shown in FIG. 3, and when an abnormality is detected, the winding shaft 21 is moved by the motor 25 as shown by the white arrow in FIG. The light shielding curtain 19 is unfolded by rotating in the direction.
A suspension weight 19a is attached to the tip of the light shielding curtain 19, and when the light shielding curtain 19 is deployed, the light shielding curtain 19 can be deployed without being pulled and loosened.

<< Case >>
The housing | casing 23 consists of a box shape which has the slit 23a, as shown in FIG.
As shown in FIG. 5 (a), the light-shielding curtain 19 in a wound state is housed inside the casing 23 at the normal time. When an abnormality is detected, the light-shielding curtain 19 is opened from the slit 23a as shown in FIG. 5 (b). It can be deployed. Although not shown in the drawings, it is preferable that the suspended weight 19a is fixed to be exposed outside the housing 23 and in contact with the slit 23a in a normal state.

≪Motor≫
The motor 25 expands the light shielding curtain 19 by rotating the winding shaft 21, and corresponds to the curtain unfolding means of the present invention.
As shown in FIGS. 3 and 4, the motor 25 is installed so that the winding shaft 21 can rotate.

<Abnormality detection means>
The abnormality detection means 5 is installed for each solar panel 9 as shown in FIG. 1 and is connected to the control means 7 so as to be communicable.
The abnormality detection means 5 has a function of detecting an abnormality of the solar panel 9 and a function of detecting that the abnormality of the solar panel 9 has been resolved.

Examples of abnormalities of the solar panel 9 include, for example, a decrease in power generation amount, spot-like heat generation, and that a certain solar panel 9 is generally hotter than other solar panels 9. . Below, the aspect of each said abnormality is demonstrated with the detection method.
A decrease in the amount of power generation refers to a case where the power generation amount is lower than that of a neighboring solar panel due to a failure. There is a possibility of fire due to overheating. A decrease in power generation can be detected by using an ammeter.
The spot-like heat generation is caused when, for example, a part of the cells 11 of the solar panel 9 (an example shown by hatching in FIG. 6) is not sufficiently exposed to light due to an obstacle, and the cell 11 cannot generate power. May cause a fire.
As a detection method, an infrared sensor, an infrared camera, or the like detects whether the temperature is high in a spot manner.

  It will be described that a certain solar panel 9 is generally hotter than other solar panels 9. Since the solar panel 9 converts sunlight into electric energy when generating electricity, the temperature is lower than the surroundings when operating normally. In the case where a plurality of solar panels 9 are arranged side by side, if the temperature of a certain solar panel 9 is higher than that of other solar panels 9, it may not generate power. In such a case, heat may be generated and a fire may occur. In order to detect whether the temperature is high, for example, it can be detected by a thermocouple or an infrared camera.

<Control means>
The control means 7 receives an abnormality signal output from the abnormality detection means 5 when an abnormality is detected by the abnormality detection means 5, and outputs a rotation signal for rotating the motor 25 as a light shielding device development signal. The motor 25 is controlled to rotate so that the light shielding curtain 19 is deployed.

An example of a light shielding method for the solar panel 9 using the light shielding system 1 according to the present embodiment configured as described above will be described with reference to FIG. In FIG. 7, the abnormality detection means 5 and the control means 7 are not shown.
In a normal time, as shown in FIG. 7A, power is generated by the solar panel 9, and the current value and the like are monitored by the abnormality detection means 5. If an abnormality occurs in one solar panel 9, this is detected as an abnormality by the abnormality detection means 5.

At the time of detecting an abnormality, the control means 7 deploys the light shielding curtain 19 by rotating the motor 25 of the light shielding means of the solar panel 9 where the abnormality is detected (see FIG. 7B).
By doing so, power generation of the solar panel 9 in which an abnormality has been detected is stopped, and the occurrence of a fire can be prevented in advance.

  In the above, an example is shown in which only the solar panel 9 in which an abnormality is detected is shielded from light. However, all the solar panels 9 other than the solar panel 9 in which an abnormality is detected may be shielded (FIG. 8). reference). The reason for this will be described below with reference to FIG.

FIG. 9 is a diagram for explaining the current flow of the string when the power generation amount of one solar panel 9 is reduced.
At normal times, current flows through the cells 11 of each solar panel 9 to the adjacent solar panels 9 (see FIG. 2).
On the other hand, when the solar panel 9 is shaded and the resistance value of the solar panel 9 increases (the power generation amount decreases at this time), the current generated from the other solar panels 9 is shaded. It flows through the bypass diode 13a having a resistance value smaller than that of the solar panel 9. That is, as shown in FIG. 9, the current is bypassed to the adjacent solar panel 9 without passing through the cell 11 of the solar panel 9 whose power generation amount has decreased. At this time, if the bypass diode 13a is out of order, the bypass diode 13a cannot be bypassed, and a current flows through the solar panel 9 having an increased resistance value. There is a risk of becoming.

In this case, even if only the solar panel 9 that has abnormally generated heat is blocked to stop power generation, the solar panel 9 having an increased resistance value as long as power is generated by another solar panel 9 (in detail, Since current continues to flow in the shadowed cell 11), abnormal heat generation continues and fire cannot be prevented.
That is, as shown in FIG. 8, the light shielding device 3 of each solar panel 9 is operated in conjunction with the case where it is necessary to stop the power generation in the entire string, that is, an abnormality occurs in the bypass diode 13a. This is the case.

  In addition, in order to light-shield all the solar panels 9, it does not operate the light-shielding device 3 provided in each solar panel 9 as mentioned above, For example, as shown in FIG. A light shielding device 3 having a size of 9 may be provided to shield light. In this case, as shown in FIG. 11, the light shielding device 3 may be provided separately from the solar panel 9.

As described above, in the present embodiment, an abnormality is detected by the light shielding device 3 that shields the panel surface of the solar panel 9, the abnormality detection unit 5 that detects abnormality of the solar panel 9, and the abnormality detection unit 5. And the control means 7 for operating the light shielding device 3 when the solar panel 9 is operated, the power generation is stopped by covering the solar panel 9 with the light shielding curtain 19 when an abnormality occurs during the power generation of the solar panel 9. It is possible to prevent a fire from occurring.
In the first embodiment according to the present invention, the case where only the solar panel 9 in which an abnormality has occurred is shielded from light and the case where the entire string including the solar panel 9 in which an abnormality has occurred has been described are described. You may combine. That is, when an abnormality occurs in the solar panel 9, first, the light shielding curtain 19 is deployed only on the solar panel 9. Next, an ammeter is provided in advance in the bypass diode 13a, and when one light shielding curtain 19 is deployed on the solar panel 9 in which an abnormality has occurred, the ammeter is connected to the bypass diode 13a. Check if current flows. Finally, if the current flows through the bypass diode 13a, the bypass diode 13a works normally. Therefore, this state is maintained. If the current does not flow through the bypass diode 13a, the bypass diode 13a is broken. Therefore, the light-shielding curtain 9 is developed over the entire string of solar panels 9.
As a method for detecting a failure of the bypass diode 13a, in addition to using an ammeter, there is a method of monitoring the solar panel 9 on which one light shielding curtain 19 is deployed with an infrared camera. That is, when the light shielding curtain 19 is deployed, the surface temperature (or the back surface temperature) of the solar panel 9 that is normally hidden by the light shielding curtain 19 decreases, but when the bypass diode 13a fails, the solar panel Accordingly, the failure of the bypass diode 13a is detected. Then, the light shielding curtain 19 may be developed over the entire string.

Note that, in the above description, when the solar panel 9 is spotted by the shadow of an obstacle, the light shielding curtain 19 is deployed to stop power generation.
In the case of an obstruction caused by an obstacle, it is desirable to automatically restart power generation when the obstruction no longer shades.
Therefore, after a certain cell 11 generates heat abnormally and covers the solar panel 9 with the light shielding curtain 19, the temperature of the cell 11 is measured, and when the temperature drops to a predetermined value, the light shielding curtain 19 is stored. Power generation may be resumed.
Thereafter, if the solar panel 9 does not generate abnormal heat, the power generation is continued as it is, and if the abnormal heat is generated again, the solar panel 9 may be covered with the light-shielding curtain 19 again.
Although the case where spot-like heat_generation | fever was detected was demonstrated above, it is applicable not only to it but when the solar panel 9 is entirely higher temperature than the adjacent solar panel 9. FIG. That is, a plurality of solar panels are monitored with a thermocouple or an infrared camera, and when there is a solar panel 9 whose temperature is generally higher than that of the adjacent solar panel 9, the light shielding curtain 19 is deployed on the entire string. When the temperature difference between the adjacent solar panels 9 disappears, the light shielding curtain 19 is stored.

What is necessary is just to measure the temperature of the solar panel 9 of the state covered with the light-shielding curtain 19 with an infrared sensor, an infrared camera, etc. from the panel back surface side of the solar panel 9. FIG.
The abnormality detection means 5 has a function of detecting that the abnormal heat generation of the solar panel 9 has been eliminated, and outputs an abnormality cancellation signal to the control means 7 when the abnormality elimination is detected. Then, the control means 7 that has received the abnormality release signal outputs a reverse rotation signal for reversely rotating the motor 25 as a light shielding device housing signal, thereby controlling the motor 25 in reverse rotation, and the light shielding curtain 19 is attached to the housing 23. Just store it.
At this time, the motor 25 corresponds to the curtain storage means of the present invention.

In the above description, the motor-type device that rotates or reversely rotates the winding shaft 21 with the motor 25 is described as an example of the light-shielding device 3, but the configuration of the light-shielding device is not limited to this.
For example, a link type as shown in FIG. 12 (link type light shielding device 27) or an airbag type (airbag type light shielding device 35) as shown in FIG. 14 may be used.
Hereinafter, the link type light shielding device 27 and the airbag type light shielding device 35 will be described in detail.

<Link type shading device>
As shown in FIG. 12, the link type light shielding device 27 includes a link mechanism 29, a rotation motor 31 that operates the link mechanism 29, and a winding spring that urges the winding shaft 21 to rotate in the winding direction. (Not shown).
FIG. 12 is a view showing the internal structure of the housing 23 of the link type light shielding device 27 and includes a partial cross-sectional view. In FIG. 12, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals.

The link mechanism 29 is installed on both sides of the light-shielding curtain 19 and is connected to an upper link member 29a having one end rotatably fixed to the housing 23, and the other end and one end of each upper link member 29a being rotatably connected. The lower link member 29b and a connecting link member 29c that is rotatably connected to the other end and both ends of each lower link member 29b.
The connection link member 29c is attached along one end of the light shielding curtain 19, and the light shielding curtain 19 is pulled out by the movement of the connection link member 29c.

  As shown in FIG. 13 (a), the link mechanism 29 is normally folded and stored in the curtain storage unit, and when the abnormality is detected, the link mechanism 29 is moved from the state shown in FIG. 13 (a) to the upper link member. 29a is rotated around one end fixed to the housing 23, and the space between the upper link member 29a and the lower link member 29b is opened, and the connecting link member 29c is moved (see FIG. 13B). When the angle formed by the upper link member 29a and the lower link member 29b is 180 °, the moving distance of the connecting link member 29c is maximized, and the entire panel surface of the solar panel 9 is covered with the light shielding curtain 19. In addition, illustration of the housing | casing 23 is abbreviate | omitted in FIG.

As described above, the connection link member 29c is attached to one end of the light shielding curtain 19, and the connection link member 29c moves overcoming the urging force in the winding direction of the winding spring, so that the light shielding curtain 19 is pulled out. It is. By doing in this way, the light-shielding curtain 19 is unfolded without being pulled and slackened in the longitudinal direction.
The rotation motor 31 is installed so as to be able to rotate the upper link member 29 a by being driven, and is driven and controlled by the control means 7.
Note that the abnormality detection means 5 outputs an abnormality cancellation signal to the control means 7 when abnormality elimination is detected. Then, the control means 7 that has received the abnormality release signal outputs a reverse rotation signal for reversely rotating the motor 25 as a light shielding device accommodation signal, thereby controlling the reverse rotation of the motor 25, folding the link mechanism 29, and linking the link mechanism 29 The light shielding curtain 19 may be stored in the housing 23 of the light shielding device 27.

<Airbag type shading device>
As shown in FIG. 14, the airbag-type light-shielding device 35 includes a bellows-shaped light-shielding curtain 37, an airbag 39 having a bellows-like shape and attached to both sides of the light-shielding curtain 37, and gas filled with each airbag 39. It has a cylinder 41 that is connected via an air supply pipe so as to be able to supply air, and a valve 43 that is provided between the airbag 39 and the cylinder 41 and controls gas supply by opening and closing. FIG. 14 is a view showing the internal structure of the casing 23 of the airbag-type light shielding device 35, and includes a partial cross-sectional view.

  The opening and closing of the valve 43 is controlled by the control means 7. The valve 43 is normally closed, and when an abnormality is detected, the valve 43 is opened by a valve opening signal as a light shielding device deployment signal output from the control means 7.

As shown in FIG. 15A, the light shielding curtain 37 and the air bag 39 are stored in the housing 23 in a folded state during normal storage.
When an abnormality is detected, the gas is supplied into the airbag 39, so that the airbag 39 is inflated and the light shielding curtain 37 is deployed as shown in FIG.

In the above description, air is supplied to the airbag 39 by opening the valve 43. However, a fan may be provided instead of the cylinder 41 and the valve 43, and air may be supplied by operating the fan.
Further, when the air bag 39 is provided with exhaust means such as an exhaust fan and the abnormality is resolved, the control means 7 outputs a valve close signal for closing the valve 43 to close the valve 43 and By exhausting the gas in the airbag 39 by the exhaust means and returning the airbag 39 to a size that can be stored in the casing 23, the light shielding curtain 37 and the airbag 39 are automatically stored in the casing 23. The light shielding device 35 may be returned to the normal state.

[Embodiment 2]
In Embodiment 1 described above, the light shielding device of the light shielding system 1 for the solar panel according to the present invention has been described using a curtain-shaped device such as the light shielding curtain 19 or the light shielding curtain 37 as an example. The light shielding method of the optical panel is not limited to these, and may be shielded by radiating a light shielding agent to the solar panel 9, for example.
Below, after demonstrating the light-shielding agent to be radiated | emitted, the radiation-type light-shielding apparatus 51 which can implement | achieve the above light-shielding methods is demonstrated in detail based on FIG. 16 and FIG.

<Light shielding agent>
The light-shielding agent is used to shield the light incident on the solar panel 9 by radiating and applying to the surface of the solar panel 9, and the swellable layered clay mineral and the light-shielding pigment are mixed with water. And is thixotropic.

Examples of the swellable layered clay mineral include smectite and bentonite.
Smectite and bentonite become thixotropic substances by dispersing in water.
“Thixotropy” is a property exhibited by an intermediate substance between a plastic solid such as a gel and a non-Newtonian liquid such as a sol, and the viscosity changes with time. Specifically, by applying a predetermined shearing force by stirring or shaking, the viscosity decreases and becomes liquid, while the viscosity decreases and the mixture is left for a certain period of time. , A characteristic in which the viscosity gradually increases and finally becomes solid.

The reason why the light-shielding agent has thixotropy is to prevent it from falling off when it is applied by spraying onto an inclined glass surface such as the solar panel 9.
In order to give viscosity so that it does not flow down, in the case of smectite, it is preferable to disperse it in water at a ratio of 1.5 wt% to 40 wt%. This is because if it is less than 1.5% by weight, the viscosity will be low and it will flow down when applied.
On the other hand, if it exceeds 40% by weight, a large shearing force is required to make it liquid, so that it is difficult to mix the light-shielding pigment with water in which smectite is dispersed.

  Examples of the light-shielding pigment include titanium oxide, magnesium oxide, ferric oxide, carbon black and the like.

As described above, the light-shielding agent of the present embodiment is configured by dispersing a swellable layered clay mineral and a light-shielding pigment in water.
If it is the above light-shielding agents, it will be in the state where viscosity is high in the storage state, but it will be in the liquid state which viscosity reduced by applying a pressure etc. to this and applying a shear force. By becoming liquid, radiation becomes possible and can be sprayed onto the surface of the target.
And after apply | coating to the surface of a target object, since viscosity remains high and it stays on the target object surface without flowing down, the light-shielding effect can be maintained.

Next, each structure of the radiation-type light shielding device 51 for radiating the light shielding material will be described.
As shown in FIG. 16, the radiation-type light shielding device 51 of the present embodiment includes a light-shielding agent housing portion 53 that houses a light-shielding agent, and a radiation nozzle 55 that communicates with the light-shielding agent housing portion 53 and has a radiation nozzle 55 at the tip. A pipe 57 that forms a radiation path from the storage section 53 to the radiation nozzle 55, an on-off valve 59 that is provided in the middle of the pipe 57 to open and close the radiation path, and radiates the light shielding agent in the light shielding agent storage section 53. And pressurizing means 61 for applying pressure for applying force, and the control means 7 controls the opening and closing of the on-off valve 59.
16 and 17, illustration of the abnormality detection unit is omitted, and illustration of the control unit 7 is omitted in FIG. 17. 16 and 17, the same reference numerals are given to the same components as those in FIG.

<Light shielding agent storage>
The light-shielding agent storage unit 53 stores the above-described light-shielding agent, and specifically includes, for example, a stationary storage tank.

<Piping>
The pipe 57 communicates with the light shielding agent storage portion 53 and has a radiation nozzle 55 at the tip thereof to form a radiation path from the light shielding agent storage portion 53 to the radiation nozzle 55.

<Open / close valve>
The on-off valve 59 is a valve that is provided in the middle of the pipe 57 to open and close the radiation path.

<Pressurizing means>
The pressurizing means 61 applies a pressure for applying a liquid discharge radiation force to the light shielding agent in the light shielding agent storage unit 53, and is, for example, an air compressor.

<Control means>
The control means 7 can control the opening / closing of the opening / closing valve 59.

The operation of the radiation shielding device 51 configured as described above will be described.
When the abnormality detection means 5 detects an abnormality, it outputs an abnormality signal to the control means 7, and the control means 7 that has received the abnormality signal outputs a valve opening signal to the on-off valve 59 and pressurizes the pressure means. A signal is output. As a result, the on-off valve 59 is opened, and the pressure serving as the radiation force is applied to the light-shielding agent storage portion 53 when the pressurizing means 61 is activated. When pressure is applied while the on-off valve 59 is open, the light shielding agent starts moving toward the pipe 57, and the viscosity of the light shielding agent decreases due to this movement. Radiation is enabled by the reduced viscosity, and the light shielding agent is emitted from the radiation nozzle 55 (see FIG. 17B). In FIG. 17B, the radiated light shielding agent is indicated by gray shading.
The emitted light shielding agent adheres to the solar panel 9 and shields light incident on the solar panel 9. When the light-shielding agent attached to the surface of the solar panel 9 is left for a predetermined time, the viscosity gradually increases and finally becomes solid, so that the surface of the solar panel 9 is stably covered.

  As described above, in the present embodiment, as in the first embodiment, it is possible to stop the power generation by shielding the solar panel 9, and when the solar panel 9 has an abnormality during the power generation, In addition, a fire can be prevented.

  In addition, if the light-shielding agent that flows down the surface of the solar panel 9 is collected and circulated so that it can be emitted again, the amount of the light-shielding agent to be used can be reduced.

  The above has described an example in which the entire string is used as the radiation range. However, the radiation range is not limited to this mode. For example, a radiation nozzle 55 corresponding to each solar panel 9 is provided to radiate a light shielding agent. Good. At this time, as in the first embodiment, the light shielding agent may be emitted only from the radiation nozzle 55 corresponding to the solar panel 9 in which an abnormality has occurred, or the light shielding agent is emitted from the radiation nozzle 55 corresponding to the entire string. May be.

DESCRIPTION OF SYMBOLS 1 Shading system of solar panel 3 Shading apparatus (Embodiment 1)
DESCRIPTION OF SYMBOLS 5 Abnormality detection means 7 Control means 9 Solar panel 11 Cell 13 Junction box 13a Bypass diode 15 Mount 19 Light shielding curtain 19a Hanging weight 21 Winding shaft 23 Case 23a Slit 25 Motor 27 Link type light shielding device (of Embodiment 1) Other aspects)
DESCRIPTION OF SYMBOLS 29 Link mechanism 29a Upper link member 29b Lower link member 29c Connection link member 31 Rotation motor 35 Airbag type light-shielding device (further aspect of Embodiment 1)
37 light shielding curtain 39 air bag 41 cylinder 43 valve 51 radiation-type light shielding device (Embodiment 2)
53 Light-shielding agent storage part 55 Radiation nozzle 57 Piping 59 On-off valve 61 Pressurizing means

Claims (2)

A plurality of solar panels connected in series, and a bypass diode that bypasses the solar panels in which an abnormality has occurred, and the current flowing through each solar panel shields the panel surface of the plurality of solar panels. An apparatus, an abnormality detection unit that is installed for each solar panel and detects an abnormality of the solar panel, and a control unit that operates the light shielding device when an abnormality is detected by the abnormality detection unit,
The light-shielding device comprises a light-shielding curtain that covers the surface of each solar panel, and curtain unfolding means that unfolds the light-shielding curtain,
When the abnormality is detected by the abnormality detection means, the control means shields only the solar panel in which the abnormality is detected, and then confirms the failure of the bypass diode, and if a current flows through the bypass diode The bypass diode is determined to be normal and maintained in its state, and if no current flows through the bypass diode , the bypass diode is determined to be faulty and all the plurality of solar panels are shielded from light. A shading system for a solar panel, wherein the shading device is operated. A light shielding device that includes a plurality of solar panels connected in series, and a bypass diode that bypasses the solar panel in which an abnormality has occurred in a current flowing through each solar panel, and shields the panel surface of the plurality of solar panels. And an abnormality detection unit that is installed for each solar panel and detects the abnormality, and a control unit that operates the light-shielding device when an abnormality is detected by the abnormality detection unit,
The light shielding device comprises a light shielding agent containing a thixotropic light shielding agent, wherein a swellable layered clay mineral made of smectite or bentonite and a light shielding pigment are dispersed in water, and communicated with the light shielding agent containing portion. A radiation path forming member having a radiation nozzle at the tip and forming a radiation path from the light shielding agent storage part to the radiation nozzle, an on-off valve for opening and closing the radiation path in the radiation path forming member, and the light shielding agent Pressurizing means for applying a pressure for applying a radiation force to the light-shielding agent of the storage unit,
The said control means controls the opening / closing of the said on-off valve so that all the said solar panels may be light-shielded when abnormality is detected by the said abnormality detection means, The light-shielding system of the solar panel characterized by the above-mentioned.

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