KR101819328B1 - Photocoltaics system with snow removal function and photocoltaics method using the same - Google Patents
Photocoltaics system with snow removal function and photocoltaics method using the same Download PDFInfo
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- KR101819328B1 KR101819328B1 KR1020160041739A KR20160041739A KR101819328B1 KR 101819328 B1 KR101819328 B1 KR 101819328B1 KR 1020160041739 A KR1020160041739 A KR 1020160041739A KR 20160041739 A KR20160041739 A KR 20160041739A KR 101819328 B1 KR101819328 B1 KR 101819328B1
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- 238000010248 power generation Methods 0.000 claims abstract description 68
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/10—Cleaning arrangements
- H02S40/12—Means for removing snow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/049—Protective back sheets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
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- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
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Abstract
The present invention relates to a solar power generation system having a snow removal function and a solar power generation method using the solar power generation system. The solar power generation system having a snow removal function includes a heating film of carbon material which generates heat by receiving a voltage, A sensing module for sensing a snowfall amount and a solar radiation amount of the solar photovoltaic module, comparing the sensed snow amount and a solar radiation amount with respective predetermined threshold values, And a control panel for controlling the supply of the alternating voltage to the heat generating film or cutting off the supply of the heat generating film according to a result of the comparison, wherein the control panel is connected to the solar module, The heating film is turned on or turned off to supply the AC voltage to the heating film, It comprises a distribution board for controlling to. As described above, according to the present invention, it is possible to determine whether or not to remove snow from the solar module in consideration of the snow removal time, the snowfall amount, and the solar radiation amount. Particularly, the snow removal operation is interrupted between the sunset time and the sunrise time, and the power consumed for snow removal is compared with the generated power at the top of the photovoltaic module in the snow accumulation state, It is possible to increase the power efficiency because the snow removal is judged in consideration of the power relationship.
Description
The present invention relates to a solar power generation system having a snow removal function and a solar power generation method using the solar power generation system. More particularly, the present invention relates to a solar power generation system having a snow removal function for increasing solar power generation efficiency by removing snow, The present invention relates to a solar power generation method.
Recently, energy resources such as petroleum, coal and natural gas are expected to be depleted, and awareness of environmental pollution is rising. Especially, the solar power generation system is being developed through enormous support from many countries in the world, and many companies are entering into development projects.
However, solar power generation is a power generation technology that is sensitive to weather and climate change because it generates electricity by collecting sunlight. The power generation is high when the weather is clear and the solar radiation is large, but the power generation is low on the day when the weather is cloudy or bad weather occurs. Especially, when the snow is piled up on the solar module, the solar module can not concentrate the sunlight, so the power generation efficiency is very low. Therefore, it is essential to remove the snow cover of the solar module in order to increase the solar power generation efficiency.
However, most solar power plants are often operated by unmanned or small manpower, which makes it difficult to snow and there is a risk of safety accidents when snowing. In addition, in recent years, frequent snowfall has occurred, and snow is easily frozen due to moisture content, making snow removal difficult. In addition, in order to increase the power generation efficiency, there are more cases in which solar modules are installed in snowy areas such as roofs and lakes of snowy areas where snow removal is difficult.
The technology which is the background of the present invention is disclosed in Korean Patent Laid-Open No. 10-2013-0087171 (published on Aug. 20, 2013).
SUMMARY OF THE INVENTION It is an object of the present invention to provide a photovoltaic power generation system having a snow removal function for removing solar snow to improve efficiency of photovoltaic power generation, and a photovoltaic power generation method using the same.
According to an aspect of the present invention, there is provided a solar photovoltaic power generation system including a snow removing function, the solar power generation system including a heating film made of carbon to generate heat by receiving a voltage, A sensing module for sensing a snowfall amount and a solar radiation amount of the solar module, comparing the sensed snowfall amount and a solar radiation amount with respective predetermined threshold values, comparing a current time with a preset snow removal time, A control panel connected to the photovoltaic module and configured to turn on or off the switch according to the control signal to generate a shutdown control signal for controlling the supply of the alternating voltage to the heating film, and a distribution panel for controlling the supply of the AC voltage or the supply of AC voltage to the heating film.
The solar module includes a first sealing material stacked on a backsheet, a heat generating film of carbon material stacked on top of the first sealing material, a second sealing material stacked on top of the heating film, A third sealing material stacked on top of the solar cell module, and a tempered glass stacked on top of the third sealing material.
The first to third sealing materials may be formed using a polyolefin elastomer.
The control panel determines whether or not the current time is included in the snow removal operation time, determines whether the sensed snowfall amount is greater than a predetermined first threshold value, and determines whether the sensed amount of solar radiation is greater than a predetermined second threshold value If the current time is included in the snow removal time and the sensed snowfall is greater than or equal to a predetermined first threshold value and the sensed amount of solar radiation is greater than or equal to a preset second threshold, The control unit generates a snow removal control signal for controlling an AC voltage to be supplied to the heat generating film. When the current time is not included in the snow removal operation time or the sensed snowfall amount is less than a predetermined first threshold value, A signal for generating a snow removal control signal for controlling the supply of AC voltage to the heating film is cut off It may include a.
Wherein the distribution panel is configured to connect the transformer and the heat generating film through a first switch and to supply the AC voltage generated by the transformer at the time of turning on to the heating film, And a first switch unit for intercepting the first switch unit.
The power distributing panel connects the inverter and the heat generating film through a second switch and receives an AC voltage generated from a transformer connected to the inverter when the lamp is turned on and supplies the AC voltage to the heating film. And a second switch unit for interrupting the supply of the voltage.
Wherein the control panel generates a power generation control signal for controlling whether or not the solar module is powered on, the power distribution panel connects the solar module and the inverter via a third switch, and in accordance with the power generation control signal, And a third switch unit for receiving the DC voltage generated from the solar module at the time of supplying the solar module to the inverter and stopping the power generation of the solar module at the time of turn-off.
In another aspect of the present invention, there is provided a solar power generation method using a solar power generation system, comprising the steps of sensing a snowfall amount and a solar radiation amount of a solar module including a heating film of carbon material, Comparing the sensed snowfall amount and the solar radiation amount with respective preset threshold values and comparing the current time with a predetermined snow removal time, controlling the supply of the AC voltage or cutting off the supply of heat to the heating film according to the comparison result Generating a control signal and controlling the switch to turn on or turn off according to the control signal to supply or block the AC voltage to the heating film.
As described above, according to the present invention, it is possible to determine whether or not to remove snow from the solar module in consideration of the snow removal time, the snowfall amount, and the solar radiation amount. In particular, it is possible to reduce unnecessary power consumption by stopping snow removal between sunrise time and sunrise time without solar radiation, and to compare the power consumed for snow removal and the generated power at the top of the solar module, The power efficiency can be improved. In addition, the power efficiency can be improved by considering the relation between the power used for snow removal and the generated power after snow removal through the irradiation amount to determine the snow removal.
The heating film of the carbon material according to the present invention can maintain the durability of the module during snow removal because there is no melting phenomenon in which a solid material absorbs energy and changes into a liquid state. In addition, a heat generating film formed using a carbon material has a weight less than that of a metal, minimizing a mechanical load applied to a mounting structure of the solar module, and has advantages of being more elastic and stronger than a metal material and having high durability. In particular, since the heat generating film of the carbon material according to the embodiment of the present invention has a high thermal conductivity, it has a high ability to discharge the heat of the solar module to the outside during solar power generation, thereby suppressing the temperature rise of the solar module .
The sealing material of the solar module according to the present invention is formed by using a polyolefin elastomer material, thereby improving the durability of the solar module and improving the electrical stability of the heating film and the back sheet through high insulation performance.
According to the embodiment of the present invention, since the power used for snow removal can be supplied in the direction of the transformer, the inverter, the distributing box, and the solar module, it is unnecessary to install a separate transmission line connected from the transformer to the distribution board. System construction is easy.
1 is a view for explaining a solar power generation system having a snow removal function according to an embodiment of the present invention.
2 is a configuration diagram of the control panel shown in Fig.
3 is a view for explaining the distribution board shown in Fig.
Fig. 4 is a view for explaining the solar module shown in Fig. 1. Fig.
FIG. 5 is a flowchart illustrating a solar power generation method according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.
1 to 4, a photovoltaic power generation system according to an embodiment of the present invention will be described. FIG. 1 is a view for explaining a solar power generation system having a snow removal function according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of the control panel shown in FIG. Fig. 3 is a view for explaining the distribution panel shown in Fig. 1, and Fig. 4 is a view for explaining the solar module shown in Fig.
1, a solar power generation system having a snow removal function according to an embodiment of the present invention includes a
First, the
Specifically, the SenSeng module can sense the amount of snow on the upper surface of the
Meanwhile, the
Next, the
As shown in FIG. 2, the
First, the determination unit 210 determines whether the current time is included in the snow removal time. At this time, the snow removal operation time can be preset to a time zone between sunrise time and sunset time. In addition, since the sunrise time and the sunset time vary with a year, the snow removal time can be set differently at a constant date interval.
Then, the determination unit 210 determines whether the sensed snowfall amount is greater than a predetermined first threshold value. At this time, the first threshold value may be set in consideration of the electric power used for removing the snow on the upper surface of the
In addition, the determination unit 210 determines whether the sensed amount of solar radiation is greater than a predetermined second threshold. At this time, the second threshold value may be set in consideration of electric power used for snow removal on the upper surface of the
Next, the signal generation unit 220 generates a snow removal control signal using the determination result of the determination unit 210.
Specifically, if the current time is included in the snow removal time, the sensed snowfall is greater than or equal to a preset first threshold, and the sensed solar radiation is greater than or equal to a predetermined second threshold, And generates a snow removal control signal for controlling the AC voltage to be supplied to the
On the other hand, if the current time is not included in the snow removal operation time, or if the sensed snowfall amount is smaller than the predetermined first threshold value or the sensed amount of solar radiation is smaller than the predetermined second threshold value, And generates a snow removal control signal for controlling the supply of AC voltage to the
The signal generator 220 may generate a power generation control signal for controlling whether the
Meanwhile, the signal generator 220 is connected to the
Next, the
3, the
First, the first switch unit 310 connects the
Next, the
Next, the
According to an embodiment of the present invention, the
Next, the
4, the
First, the
Next, the
Next, the
According to an embodiment of the present invention, a heat generating sheet includes a first member formed of polyethylene terephthalate, a carbon material heating element stacked on top of the first member, and a second member formed of polyethylene terephthalate laminated on a carbon material heating element. Member structure.
Next, the
Next, the
Next, the third sealing material 460 is stacked on top of the
Next, the tempered
Next, the inverter (Inverter) 500 receives the DC voltage generated by the
The
Next, a solar power generation method using a solar power generation system according to an embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart illustrating a solar power generation method according to an embodiment of the present invention.
As shown in FIG. 5, the
Next, the
Next, if the current time is included in the snow removal operation time, the sensed snowfall amount is equal to or greater than a preset first threshold value, and the sensed amount of solar radiation is greater than or equal to a preset second threshold value, (S530). The control signal is a control signal for controlling the AC voltage to be supplied to the
On the other hand, if the current time is not included in the snow removal operation time, or if the sensed snowfall amount is smaller than the preset first threshold value or the sensed amount of solar radiation is smaller than the predetermined second threshold value, (S535). In this case, the heating control signal for controlling the supply of the AC voltage to the
For example, it is assumed that the sensed snowfall amount is greater than a predetermined first threshold value, and that the sensed solar radiation amount is larger than a predetermined second threshold value, but the current time is not included in the snow removal time. Then, the
Next, the
Then, the
Specifically, the
In addition, the
Then, the
Meanwhile, according to the embodiment of the present invention, the
For example, when a snow removal control signal for supplying an AC voltage to the
On the contrary, when the snow removing control signal for interrupting the supply of the AC voltage to the
As described above, according to the embodiment of the present invention, it is possible to determine whether or not to remove snow from the solar module in consideration of the snow removal time, the snowfall amount, and the solar radiation amount. In particular, it is possible to reduce unnecessary power consumption by stopping snow removal between sunrise time and sunrise time without solar radiation, and to compare the power consumed for snow removal and the generated power at the top of the solar module, The power efficiency can be improved. In addition, the power efficiency can be improved by considering the relation between the power used for snow removal and the generated power after snow removal through the irradiation amount to determine the snow removal.
In addition, the heat generating film of the carbon material according to the embodiment of the present invention can maintain the durability of the module during the snow removal operation because there is no melting phenomenon in which the solid material absorbs energy and changes into a liquid state. In addition, a heat generating film formed using a carbon material has a weight less than that of a metal, minimizing a mechanical load applied to a mounting structure of a solar cell module, and has advantages of high elasticity and strength and high durability. In particular, since the heat generating film of the carbon material according to the embodiment of the present invention has a high thermal conductivity, it has a high ability to discharge the heat of the solar module to the outside during solar power generation, thereby suppressing the temperature rise of the solar module .
Next, the sealing material of the solar module according to the embodiment of the present invention is formed using the polyolefin elastomer material, thereby improving the durability of the solar module and improving the electrical stability of the heating film and the back sheet through high insulation performance There are advantages to be able to.
According to the embodiment of the present invention, since the power used for snow removal can be supplied in the direction of the transformer, the inverter, the distributing box, and the solar module, it is unnecessary to install a separate transmission line connected from the transformer to the distribution board. System construction is easy.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.
100: sensing module 200: control panel
210: determination unit 220:
300: Distribution board 310: First switch unit
320: second switch unit 330: third switch unit
400: solar module 410: back sheet
420: first sealing material 430: exothermic film
440: second sealing material 450: solar cell module
460: Third sealing material 470: Tempered glass
500: inverter 600: transformer
Claims (14)
A sensing module for sensing a snowfall amount and a solar radiation amount of the solar module,
Comparing the sensed snowfall amount and the solar radiation amount with respective predetermined threshold values, comparing the current time with a predetermined snowing running time, and controlling the supply of the AC voltage to the heating film or cutting off the supply of the heating film according to the comparison result A control panel for generating a control signal, and
And a distribution panel connected to the solar module and controlling the supply of the AC voltage or the supply of the AC voltage to the heating film by turning the switch on or off according to the control signal,
The control panel,
Determining whether or not the current time is included in the snow removal operation time, determining whether the sensed snowfall amount is greater than a predetermined first threshold value, and determining whether the sensed amount of solar radiation is greater than a predetermined second threshold value Wealth, and
If it is determined that the current time is included in the snow removal operation time and the sensed snowfall amount is equal to or greater than a predetermined first threshold value and the sensed solar radiation amount is greater than or equal to a predetermined second threshold value, And if the current time is not included in the snow removal time or the sensed snowfall amount is less than a predetermined first threshold value or the sensed amount of solar radiation is smaller than a preset second threshold value, And a signal generating section for generating a snow removal control signal for controlling the supply of the AC voltage to the film to be cut off,
The distribution board,
A transformer and a heating film are connected to each other through a first switch, an AC voltage generated in the transformer is supplied to the heating film from the transformer when the transformer is turned on, 1 switch section,
And an AC voltage generated in a transformer connected to the inverter when the inverter is turned on is received from the inverter and supplied to the heating film. And a second switch unit for shutting down the solar cell.
In the solar module,
A first sealing material stacked on top of a backsheet,
A heating film of the carbon material laminated on the upper side of the first sealing material,
A second sealing material laminated on top of the heating film,
A solar cell module stacked on top of the second sealing material,
A third sealing material stacked on top of the solar cell module, and
And a snow removing function including tempered glass laminated on top of the third sealing material.
Wherein the first to third sealing members
A photovoltaic power generation system having a snow removal function formed using a polyolefin elastomer.
The control panel,
Generating a power generation control signal for controlling whether or not the solar module is generated,
The distribution board,
A DC voltage generated in the solar module is supplied from the solar module to the inverter in accordance with the power generation control signal, And a third switch unit for stopping the power generation of the photovoltaic module when the photovoltaic module is turned off.
Sensing a snowfall amount and a solar radiation amount of a solar module including a heat generating film of carbon material which generates heat by receiving a voltage,
Comparing the sensed snowfall amount and the insolation amount with predetermined threshold values and comparing the current time with a predetermined snow removal time,
Generating a snow removal control signal for controlling the supply of the alternating voltage to the heating film or cutting off the supply of the heating film according to the comparison result; and
Controlling the switch to turn on or turn off according to the control signal to supply or block the AC voltage to the heating film,
Wherein the comparing the current time with a predetermined snow removal time comprises:
Determining whether or not the current time is included in the snow removal operation time, determining whether the sensed snowfall amount is greater than a predetermined first threshold value, determining whether the sensed amount of solar radiation is greater than a predetermined second threshold value,
Wherein the step of generating the snow removal control signal comprises:
If it is determined that the current time is included in the snow removal operation time and the sensed snowfall amount is equal to or greater than a predetermined first threshold value and the sensed solar radiation amount is greater than or equal to a predetermined second threshold value, A snow removal control signal for controlling the supply of snow,
If the current time is not included in the snow removal operation time, or if the sensed snowfall amount is smaller than a preset first threshold value or the sensed amount of solar radiation is smaller than a predetermined second threshold value, Generates a snow removal control signal,
The step of controlling the supply of the AC voltage or blocking the supply of the AC voltage includes:
The AC voltage generated in the transformer when the first switch is turned on is received from the transformer and is supplied to the heating film, the supply of the AC voltage is cut off when the first switch is turned off,
And a snow removing function for receiving the AC voltage generated in the transformer when the second switch is turned on from the inverter, supplying the AC voltage to the solar module, and cutting off the supply of the AC voltage when the second switch is turned off.
In the solar module,
A first sealing material stacked on top of a backsheet,
A heating film of the carbon material laminated on the upper side of the first sealing material,
A second sealing material laminated on top of the heating film,
A solar cell module stacked on top of the second sealing material,
A third sealing material stacked on top of the solar cell module, and
And a snow removing function including tempered glass laminated on top of the third sealing material.
Wherein the first to third sealing members
A solar power generation method comprising a snow removing function formed by using a polyolefin elastomer.
The step of controlling the supply of the AC voltage or blocking the supply of the AC voltage includes:
Generating a power generation control signal for controlling whether or not the solar module is generated, and
A DC voltage generated in the photovoltaic module is supplied from the photovoltaic module to the inverter when the third switch is turned on according to the power generation control signal, and the power generation of the photovoltaic module is stopped when the third switch is turned off Further comprising the step of:
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KR101020751B1 (en) * | 2010-06-10 | 2011-03-09 | 주식회사 에스에너지 | Snow removal apparatus for photovoltaic system |
JP2015082611A (en) * | 2013-10-23 | 2015-04-27 | 三菱化学株式会社 | Snow-melting sheet with integrated solar cell and method for installing snow-melting sheet with integrated solar cell |
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KR101020751B1 (en) * | 2010-06-10 | 2011-03-09 | 주식회사 에스에너지 | Snow removal apparatus for photovoltaic system |
JP2015082611A (en) * | 2013-10-23 | 2015-04-27 | 三菱化学株式会社 | Snow-melting sheet with integrated solar cell and method for installing snow-melting sheet with integrated solar cell |
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