JP2001257376A - Photovoltaic power generation system and solar battery panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power required for melting snow. SOLUTION: Solar battery strings 71 to 7n are arranged in parallel, along a direction which is almost a horizontal direction at the time of installing a solar battery panel 1. Control circuits 6 and 26 individually control the supply of power to the respective solar battery strings 71 to 7n according to with the travel of melting snow. Thus, snow melting advances. When only the snow at the upper part of the panel becomes melted, the supply of power for melting snow to the solar battery strings 71 to 7n positioned on the upper part of the panel is selectively made to stop.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar power generation system having a snow melting function and a solar cell panel used for the system.

[0002]

2. Description of the Related Art In recent years, a distributed power source based on photovoltaic power generation and a commercial power source have been linked to supply power to home appliances (loads) by photovoltaic power generation. If power cannot be provided by photovoltaic power generation alone, a system that supplies the power from the grid has been developed.
Such a system consists of: That is, a solar panel that converts sunlight energy into electric energy, a connection box configured so that output from the solar panel does not flow back to the solar panel, and synchronization of DC power from the solar panel with commercial power. A photovoltaic power generation system is composed of a power conversion device that converts AC power into a sufficient power and a protection device that detects an abnormality of a commercial power supply. Usually, the power converter and the protection device are integrated and called a power conditioner.

Some of such photovoltaic power generation systems have a snow melting function in which power is supplied from a system power supply to a solar cell panel and the heat generated by the power supply melts the snow on the solar cell panel.

[0004]

A solar power generation system having a snow melting function has the following problems. That is, the power supply operation is performed until all of the snow on the solar cell panel melts, but the power supply operation is uniformly performed on the entire solar cell panel during the snow melting period. Therefore, the power required for snow melting is not small, and it has been desired to reduce the power.

Accordingly, a primary object of the present invention is to reduce the power required to melt snow.

[0006]

In order to achieve the above-mentioned object, a photovoltaic power generation system according to the present invention comprises a photovoltaic power generation system having a plurality of photovoltaic cell rows in which photovoltaic cell modules are electrically connected to each other. A battery panel and snow melting power supply means for supplying electric power to each of the solar cell arrays to generate heat, and using the heat to melt snow on the solar cell panel; and Are arranged in parallel along the direction that is substantially horizontal, and the power supply to each solar cell array is individually controlled by the snow melting power supply means in accordance with the progress of snow melting.

[0007] In this case, there is provided detecting means for detecting the presence or absence of snow on the solar cell panel, and the snow melting power supply means supplies power to the solar cell array based on the detection result of the detecting means. Is preferred. Further, it is preferable that the detection means is provided for each area on the solar cell panel divided by the solar cell row.

The operation of the above configuration will be described below. The snow accumulated on the solar cell panel gradually melts from the upper part of the panel by supplying power to the solar cell panel, and finally the snow accumulation deposited on the lowermost part of the solar cell module is melted to complete the snow melting operation. It is considered that the reason why the solar cells are melted sequentially from the upper part is that the roof on which the solar cell panels are arranged is generally inclined.

If power is continuously supplied to the entire solar cell panel during the snow melting operation that is proceeding in this manner, power is also supplied to the panel upper side where the snow melting has been completed, resulting in wasteful power consumption. Will occur. Therefore,
In the present invention, by arranging the solar cell rows in parallel along the horizontal direction when the solar cell panel is installed, the solar cell panel is divided into a plurality of pieces along the vertical direction of the panel. As a result, when the melting of snow progresses and only the snow on the upper part of the panel is melted, power is selectively supplied to the solar cell row located at the lower part of the panel, while the solar cell row located at the upper part of the panel is selectively supplied. By stopping the power supply, the snow melting operation can be performed efficiently without consuming unnecessary power.

In this configuration, if the presence or absence of snow on the solar cell panel is detected by the detecting means and the power supply to the solar cell array is controlled based on the detection result, the efficiency is further improved (the power consumption is reduced). In addition, the snow melting operation can be automatically performed without making a judgment on the snow melting state by visual observation of the user. Furthermore, if the detecting means is provided for each area on the solar cell panel divided into one or a plurality of solar cell rows, it is possible to detect an appropriate amount of the snowmelt situation that sequentially progresses along the vertical direction of the panel. It becomes possible to detect accurately with the number of means.

Further, the present invention provides a solar cell panel in which solar cell modules are arranged and arranged, and power is supplied to each of the solar cell modules to generate heat, and the heat is used to melt snow on the solar cell panel. The photovoltaic power generation system includes a snow melting power supply means for causing the solar cell module to short-circuit each of the solar cell modules individually with the snow melting power supply means in accordance with the progress of the snow melting.

In this configuration, there is provided short-circuit current detecting means for detecting a short-circuit current of each solar cell module short-circuited by the short-circuit means, and the short-circuit means detects the short-circuit current based on the detection result of the short-circuit current detecting means. It is preferable to perform a short-circuit operation for each battery module.

The operation of the above configuration will be described below. As described above, the snow accumulated on the solar cell panel gradually melts from the upper part of the panel due to the power supply to the solar cell panel, so during the snow melting operation, the power was continuously supplied to the entire solar cell panel. As a result, wasteful power consumption occurs. Therefore, in the present invention, short-circuit means for individually short-circuiting each of the solar cell modules with respect to the snow-melting power supply means in accordance with the progress of snow melting is provided. Thereby, when the melting of snow progresses and only the snow on the upper part of the panel is melted, the power supply to these solar cell modules can be stopped by short-circuiting the solar cell modules located on the upper part of the panel, Therefore, the snow melting operation can be performed efficiently without consuming unnecessary power.

In this case, since the short-circuit current of each solar cell module changes depending on the progress of snow melting, a short-circuit current detecting means for detecting the short-circuit current of the solar cell module is provided.
The short-circuit means is based on a detection result of the short-circuit current detection means,
If the short-circuit operation is performed for each solar cell module, the snow-melting operation is performed more efficiently (with reduced power consumption), and the snow-melting operation is automatically performed without the user visually checking the snow-melting state. be able to.

The snow melting power supply means is, for example, a power converter (usually incorporated in a power conditioner) capable of converting AC power taken from a system power supply into DC power for snow melting. Needless to say, this is not a limitation. Further, the detecting means for detecting the presence or absence of snow can be constituted by, for example, a temperature sensor or an optical sensor, but it is needless to say that the present invention is not limited to these. The short-circuit means can be composed of, for example, a mechanical switch, a relay, a semiconductor switch, or the like, but is not limited to these. The short-circuit current detecting means can be constituted by a general current sensor or a shunt resistor, but it is needless to say that the short-circuit current detecting means is not limited to these.

[0016]

(Embodiment 1) FIG. 1 shows an outline of a solar power generation system according to Embodiment 1 of the present invention. The solar power generation system includes a solar cell panel 1 and a connection box 2
And a power conditioner 3. Connection box 2
_Has diodes _41-n and switches _51-n . The diodes _{41 to n} function so that the DC power output from the solar cell panel 1 does not flow back to the solar cell panel 1. Switch 5 _{1 to n} is such that the snow melting power is supplied toward the solar cell panel 1 from the power conditioner 3, is implementing short circuit operation for diodes 4 _{1 ~n.}

The power conditioner 3 includes a power converter (not shown), a protection device (not shown), and a control circuit 6.
And The power converter, in normal operation,
The DC power from the solar cell panel 1 is converted into AC power synchronized with a commercial power supply. On the other hand, during the snow melting operation, AC power taken from the system power supply 9 is converted into DC power in order to supply DC power for snow melting to the solar cell panel 1. The protection circuit detects an abnormality of the system power supply 9.

The control circuit 6 performs various controls of the power conditioner 3 which converts solar cell power into AC power and flows backward to the system power supply 9. At this time, the control circuit 6 controls the switches ₅₁ to _n to open or outputs a signal. Further, during the snow melting operation, the control circuit 6 controls various operations of the power conditioner 3 which converts AC power taken from the system power supply 9 into DC power for snow melting and supplies the DC power to the solar cell panel 1. I have. At this time, the control circuit 6 controls the switches ₅₁ to _n to close.

The solar cell panel 1 is configured by arranging a plurality (= n) of solar cell arrays (generally called strings) ₇₁ to _n in parallel. Each of the solar cell columns _{71 to n} is configured by arranging a plurality of solar cell modules 8 in a row.
The respective solar cell modules 8 are connected in series with each other in the solar cell columns _{71 to n} . Each solar cell module 8 is configured by arranging a plurality of solar cells (not shown), which are the minimum units of solar cells, and sealing them in a plate shape with resin or glass. Diode _41-n and switch 5
_{1 to n} are provided for each of the solar cell columns ₇₁ to _n .

The solar cell panel 1 is configured as described above. In particular, each of the solar cell columns _{71 to n} is arranged in parallel along a direction that is substantially horizontal when the solar cell panel 1 is installed. The arrangement of the solar cell arrays ₇₁ to _n is characteristic of the present embodiment.

In the drawings, reference symbol S denotes the solar cell panel 1.
It is snow piled up.

Hereinafter, a snow melting operation by the solar power generation system will be described. When the snow melting operation is started in a state where there is snow on the solar cell panel 1, first, the control circuit 6 closes all the switches ₅₁ to _n and then supplies the AC power taken from the system power supply 9. The power is converted into DC power for snow melting by a power converter and supplied to the solar cell panel 1. Then, the electric power for snow melting is supplied to all the solar cell columns ₇₁ to _n , and the snow on the solar cell panel 1 melts sequentially from the upper part of the panel.

[0023] Then, snow melting progresses, the panel is ready for snow and snow is melted on top of the solar cell string _71, the control circuit 6 which is informed the snow melting information from some snow melting information broadcasting source, the sun only open switch 5 ₁ connected to the battery array _71, thereby selectively stopping the supply of snow melting power to the solar battery array _71. In addition, as the above-mentioned snow melting information notification source, for example, a user who visually observes the snow melting state of the solar cell panel 1 can be cited. In this case, the user can notify the control circuit 6 of the snow melting information by inputting the snow melting information to an input device (not shown).

[0024] Then, proceeding further melting snow, the solar cell string ₇₁ in the panel uppermost one lower side of the solar battery array 7 ₂
That in a state of melting to snow and snow above, the control circuit 6, which is informed from some snow melting information broadcasting source further opens the switch 5 ₂ connected to the solar battery array 7 _2, thereby, the sun with cell column ₇₁ to stop the supply of the snow melting power to solar cell strings 7 _2.

[0025] As the progresses snow melting behavior in the manner described above, sequentially, we will stop the supply of snow melting power the solar cell column ₇ 1~n, snow at the bottom of the solar battery array 7 on the _n The control circuit 6, which has been notified that the melted snow has melted, stops the power supply to all the solar cell arrays ₇₁ to _n and ends the snow melting operation.

As described above, in the present embodiment, since the snow melting current can be selectively supplied _{to the} solar cell arrays ₇₁ to _n with snow, an accurate snow melting operation can be performed with minimum power consumption. be able to.

(Embodiment 2) FIG. 2 is a configuration diagram of a photovoltaic power generation system according to Embodiment 2 of the present invention. This photovoltaic power generation system is basically the same as that of the first embodiment, and the same or similar parts are denoted by the same reference numerals and description thereof will be omitted.

The present embodiment is characterized in that a snow sensor 10 as means for detecting snow melting information is provided. In addition, the snow sensor 10 of this embodiment is an example of a detecting unit. The snow sensor 10 includes one or more solar cell rows 7.
It is provided for each area on the solar cell panel 1 divided into 1 to _n . In this embodiment, a snow sensor 10 ₁ provided on the solar battery array 7 ₃ corresponding to the solar battery array 7 _1-3 from top to third stage, all the solar cell string of the lower than opposite the 7 _{4 to n,} and a snow sensor 10 ₂ which is provided at the bottom of the solar battery array 7 on _n.

The snow melting operation by the photovoltaic power generation system is basically the same as the snow melting operation of the first embodiment, a snow-melting state of snow on the solar cell string 7 _{1 to n,} snow sensor 10 _1, detected by 10 _2, and controls the supply of snow melting power for each solar battery string 7 _{1 to n} on the basis of the detection information. Thereby, the snow melting operation can be fully automated, and the snow melting can be performed efficiently. In the present embodiment, the two since the snow sensor 10 _1, 10 ₂ are provided, the upper solar battery array 7 _1-3 group, the lower solar cell string 7
_Although the supply control of the snow-melting power has been implemented in two groups of 4 to _n groups, more snow-cover sensors may be provided to control the supply of the snow-melting power more finely. Needless to say.

The snow sensors 10 ₁ and 10 ₂ include:
Temperature sensors and optical sensors can be used as examples, but it goes without saying that the present invention is not particularly limited to these sensors. Further, as shown in FIG. 3, current sensors ₁₁₁ to _n for monitoring the current values of the snow melting power supplied to the respective solar cell arrays ₇₁ to _n are provided, and the current sensors ₁₁₁ to _n function as snow sensors. It can also be done. That is, each of the solar cell arrays _{71 to n} does not generate an electromotive force in the snow- _covered state, but generates an electromotive force when the snow melting is completed. for that reason,
In the state where the snow melting power is supplied to each of the solar cell rows ₇₁ to _n ,
When the melting operation of the predetermined solar cell array 7 _x is completed and an electromotive force is generated, the current sensor 1 connected to the solar cell array 7 _x
The amount of current flowing through _1x changes. Therefore, the current change information is regarded as snow melting information, detected by the current sensor 11x, and reported to the control circuit 6, and the supply of the snow melting power is controlled based on the current change information.

The switches _{51 to n in the first and} second embodiments described above may be of any type, such as switch relays and semiconductor switches, as long as they can control the opening and closing of the circuit. Needless to say. It is needless to say that the switches _{51 to n} may be operated automatically or manually as long as they can be operated.

Further, only the switches _51-n may be mounted on a circuit board different from the connection box 2, and this switch mounting board may be connected to the mounting board of the connection box. that way,
It is not necessary to provide the dedicated connection box 2, and the connection box 2 according to the first and second embodiments can be configured only by adding the switch mounting board to the general-purpose connection box and connecting.

(Embodiment 3) FIG. 4 shows Embodiment 3 of the present invention.

This photovoltaic power generation system includes a solar cell panel 20, a connection box 21, and a power conditioner 22, and the basic operation thereof is the same as that of the first embodiment. The description thereof is omitted.

In this embodiment, first, there is no particular limitation on the arrangement direction of the solar cell arrays _{231 to n} constituting the solar cell panel 20. Therefore, in FIG. 4, as an example of an arbitrary arrangement direction, the solar cell arrays ₂₃₁ to _n are arranged along a substantially vertical direction when the solar cell panel 20 is installed.

The solar cell panel 20 thus configured
, The solar cell modules 24 constituting each of the solar cell columns ₂₃₁ to _n are connected in series with each other for each column,
Further, each solar cell module 24 includes a short-circuit switch 25. The switch 25 short-circuits the corresponding solar cell module 24 to control the supply of the snowmelt power to the solar cell module 24.
The short-circuit operation control for each switch 25 is performed by a control circuit 26 provided in the power conditioner 22.

It should be noted that in FIG.
_1~n a plurality (= m) is composed of a solar cell module 24, in order to distinguish each solar cell module 24, the solar cell module 24 provided on the solar cell string 23 _1, sequentially from the upper side, Solar cell module 24
_{1 (1 to m),} and similarly, the solar cell modules 24 provided in each of the solar cell rows ₂₃₂ to _n are sequentially named from upper side as solar cell modules 24 2 to _{n (2 to m).} ing.

Further, in order to distinguish each switch 25,
Solar cell row 23₁From the upper side to the switch 25 provided in
Sequentially, switch 25_{1 (1 to m-1)}Named similarly, each sun
Battery row 23_{2 to m-1}The switch 25 provided on the
Sequentially, switch 25_{2 to n (2 to m- 1)}It is named. In addition,
Switch 25_{1 to n (1 to m-1)}Is the solar cell module 24
_{1 to n (1 to m)}Is provided in correspondence with. However, at the bottom
Solar cell module 24 provided in_{1 to n (m)}Corresponding to
Switch may be provided. However, in this case, the solar cell
Row 23_{1 to n}Short-circuit all solar modules in one row
I will not do it.

Although the connection box 21 is shown in a simplified _diagram , the diode 2 provided for each of the solar cell rows ₂₃₁ to _n is provided.
7 1 to _n, and switches 28 1 to _n for controlling the supply of electric power for snow melting.

Next, the snow melting operation of the solar power generation system will be described. When the snow melting operation is started in a state where there is snow on the solar cell panel 20, first, the control circuit 26 closes the switch 28 on the side of the connection box 21 and the switches _{251 to n (n} ) on the side of each solar cell module 24. ₁ to _m-1) are all opened. Then, the AC power taken from the system power supply 9 is converted into DC power for snow melting by a power converter and supplied to the solar cell panel 1. Then, all the solar cell modules 24 constituting the solar cell columns _{71-n
For 1 to n (1 to m)} , DC power for snow melting is supplied in series connection state for each row. Then, the snow on the panel 1 melts sequentially from the upper part of the panel.

[0041] Then, snow melting progresses, the panel is ready for snow and snow is melted onto the solar cell module 24 _{1 ~n} located at the top _(1), is informed the snow melting information from some snow melting information broadcasting source The control circuit 26 includes a switch 25 provided corresponding to the solar cell module 24 _{1 to n (1).}
Only _{1 to n (1)} are closed and these solar cell modules 24 _{1
To n (1)} . As a result, the supply of the snow melting power to the solar cell modules _{241 to n (1)} is selectively stopped.

Then, the melting of the snow further progresses, and the snow that has accumulated on the solar cell modules _{241 to n (2)} located below the solar cell modules _{241 to n (1)} at the top of the panel melts. Control circuit 26 that is informed that
Further closes the switches _{251 to n (2)} provided corresponding to the solar cell modules _{241 to n (2)} , thereby, together with the solar cell modules _{241 to n (1)} , 24 The supply of the snow melting power to 1 _{to n (2)} is selectively stopped.

As the snow melting operation proceeds as described above, the solar cell modules 24 are sequentially arranged from the upper side.
_{1 to n (1 to m)} continue to stop the supply of snow melting power to the control circuit 26 that the snow was snow on the bottom of the solar cell module 24 n _{(1 to m)} is melted, which is informed Is switch 2
8 is opened, and the supply of electric power for snow melting is stopped to end the snow melting operation.

As described above, in the present embodiment, the snow melting current can be selectively supplied _{to the} solar cell modules 24 1 to _{n (1 to m)} with snow. An accurate snow melting operation can be performed with power consumption. Moreover, as in Embodiment 1, the solar cell array 2
Even when 31 to _n are arranged not in the horizontal direction but in the vertical direction, the selective supply of the electric power for snow melting can be realized. Furthermore, each solar cell module 24
_Since the supply of electric power for snow melting can be controlled every 1 to _{n (1 to m)} , the electric power supply can be more finely controlled.

In the present embodiment, the above-mentioned snow melting information notification source includes, for example, detecting means such as an optical sensor and a temperature sensor. In addition, a user who visually observes the snow melting state of the solar cell panel 20 from the user is provided. Information.

(Embodiment 4) FIG. 5 is a configuration diagram of a photovoltaic power generation system according to Embodiment 4 of the present invention. This photovoltaic power generation system is basically the same as that of the third embodiment, and the same or similar parts are denoted by the same reference numerals and description thereof will be omitted.

In this embodiment, each solar cell module 2
A short-circuit current sensor 30, which is means for detecting short-circuit currents of _{41 to n (1 to m)} , is provided. The short-circuit current sensor 30 detects a snow-melting state. The short-circuit current sensor 30 may be provided in one or more solar cell modules 24 1 to _{n (1 to m)} . In this embodiment, since the snowmelt progress state may be sequentially detected along the vertical direction,
As described above, the short-circuit current sensor 30 is provided along the vertical direction of the solar cell arrays _{231 to n} . Therefore, the short-circuit current sensor 30 includes at least one of the solar cell arrays 2
31 to _n . Therefore, in this embodiment, it is provided a short-circuit current sensor 30 to the solar cell string 23 _n. The short-circuit current sensor 30 is connected to each solar cell module 24
_The switch 25 _{n (1 to m-1)} provided corresponding to _{n (1 to m-1)} is provided at a position where a current flowing through the switch 25 _{n (1 to m-1)} can be detected. The short-circuit current sensors 30 are sequentially arranged from the upper side.
₁ to _m-1 .

The snow melting operation of this solar power generation system is basically the same as the snow melting operation of the third embodiment, except that each of the solar cell modules 24 _{n (1 to m)} constituting the solar cell array 23 _n is operated. The short-circuit current is measured by the short-circuit current sensor 30 _{1 to m-1.}
, The snow melting state on the solar cell panel 20 is grasped based on the detection information, and the supply of DC power for snow melting is controlled. Thereby, the snow melting operation can be fully automated, and the snow melting can be performed efficiently. In the present embodiment, the short-circuit current sensors _{301 to m -1} are provided in the solar cell array _23n . However, more short-circuit current sensors are provided to more finely control the supply of the snow-melting power. Needless to say, this may be done.

The short-circuit current sensors _{301 to m-1} can be constituted by a general current sensor, a shunt resistor or the like.

The state of snow melting based on the short-circuit current detected by the short _- circuit current sensors _{301 to m-1} is determined as follows. First, after the start of the supply of the snow melting power _to all the solar cell modules 24 1 to _{n (1 to m)} , when a predetermined time elapses, first, the switch 25 _n located at the uppermost position By closing ₍₁₎ , the uppermost solar cell module 24 _{n (1)} is short-circuited, and only the supply of the snow melting power to the solar cell module 24 _{n (1)} is selectively stopped. In this state, switch 2
Examining the value of the short-circuit current short-circuit current sensor 30 ₁ is detected corresponding to 5 n ₍₁₎ in the control circuit 26 in the following manner.

Assuming that the current generated by the power conditioner 22 is I, the current I / n flows through n solar cell arrays ₂₃₁ to n having the same configuration and connected in parallel with each other. Become. Then, in the solar cell string 23 _n, for each solar cell are connected in series, the current supplied to the solar battery array 23n from the power conditioner 22,
All are the same and I / n.

[0052] In contrast, Shorting solar cell module 24 n ₍₁₎ to close the switch 25 n _(1), around the short-circuit current sensor 30 _1, two current loops shown in FIG. 5 L
₁ (current value = I ₁ ) and L ₂ (current value = I ₂ ) are formed,
A current (I ₁ + I ₂ ) is supplied from these current loops L ₁ and L ₂ .

[0053] Therefore, comparing the increment ΔI of generating the current I of the power conditioner 22, the increment Δ of the detection current in the short circuit current sensor 30 ₁ and (I ₁ + I _2). When Δ (I ₁ + I ₂ )> ΔI and Δ (I ₁ + I ₂ ) −ΔI> (predetermined threshold X), it is determined that the snow on the solar cell module 24 _{n (1)} is melting. Judgment is made, and otherwise, it is judged that it has not melted yet.

As described above, the control circuit 26
Module 24_{n (1)}Snow conditions, and thus the top sun
Battery module 24_{1 to n (1)}Judging the overall snowmelt situation
You. And when it is judged that snow melting has not been completed
Is the switch 25 again_{n (1)}Open the solar module
Le 24_{n (1)}Is resumed, and the above operation is repeated.
On the other hand, if it is determined that snow melting has been completed,
Closer 25_{1 to n (1)}By closing the whole, the top solar power
Pond module 24_{1 to n (1)}Short-circuit the whole and
The supply of electric power for snowmelt to the snow is stopped. And the lower position
Solar cell module 24_{1 to n (2)}Snow melting elapsed time
Starts the next stage of snow melting completion judgment processing
I do. The next stage of snowmelt completion determination processing is based on the solar cell model described above.
Jules 24 _{1 to n (1)}The process is the same as
Therefore, the description is omitted.

In this way, it is possible to determine the snow melting state of all the solar cell modules 24 1 to _{n (1 to m)} .
Note that the snowmelt progresses and further snow falls in a state where the supply of the snowmelt current to the solar cell modules _{241 to n (1 to x)} from the top to the X-th stage stops falling, and these solar cell modules ₂₄₁ to _{n ( When} snowfall occurs on 1 to _x) , power generation in these solar cell modules 24 1 to _{n (1 to x)} stops again. In such a situation, the direction of the detected current is reversed in the short-circuit current sensor 30 _x that is currently determining the snow melting situation. Therefore, if this is detected, it is determined that snow has occurred again in the upper solar cell modules _{241 to n (1 to x)} after the melting of snow. Then, the switches ₂₅₁ to _{n (1 to x)} are opened to stop the short circuit, and the snow melting operation for the solar cell modules _{241 to n (1 to x)} is restarted.

In the third and fourth embodiments described above, the arrangement positions of the connection box 21 and the switches 25 _{1 to n (1 to m−1)} are not limited to the positions shown in the drawings. Nor.
Further, it goes without saying that the switches _{251 to n (1 to m-1)} and the switches _{281 to n} can be constituted by, for example, changeover switches, push button switches, relays, and the like.

In the description of each embodiment described above, each control means for controlling snow melting is incorporated in the control circuits 6 and 26. However, as shown in FIG. The means are separated from the control circuits 6 and 26 and separately provided as independent devices as power conditioners 3 and 2.
Needless to say, it may be provided outside the device 2. In FIG. 6, as an example, the switch 25 according to the fourth embodiment is used.
_{1 to n (1 to m-1)} short-circuit control and short-circuit current monitoring control
And is provided separately.

[0058]

As described above, according to the present invention,
The snow melting operation could be performed efficiently without consuming unnecessary power. Further, the snowmelt operation can be performed more efficiently by detecting the snowmelt state by the detecting means. Furthermore, if the snowmelt situation is detected by the short-circuit current of the solar cell module, the snowmelt situation can be automatically detected,
The snow melting operation can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a solar power generation system according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating a configuration of a solar power generation system according to Embodiment 2 of the present invention.

FIG. 3 is a diagram showing a modification of the second embodiment.

FIG. 4 is a diagram illustrating a configuration of a solar power generation system according to Embodiment 3 of the present invention.

FIG. 5 is a diagram showing a configuration of a solar power generation system according to Embodiment 4 of the present invention.

FIG. 6 is a diagram showing a configuration of an example of a modified example of the present invention.

[Explanation of symbols]

1,20 solar panel 2,21
Connection box 3, 22 Power conditioner 4, 27 1- _n diode 51- _n , 2
8 1- _n switch 6, 26 control circuit 7 1- _n
Solar cell row 8 Solar cell module 10 ₁ , 10 ₂
Snow sensor 11 1 to _n Current sensor 23 1 _{to n}
Solar cell row 24 1 to _{n (1 to m)} solar cell module 25 _{1 to n (1 to m-1)} switch 30 _{1 to m-1}
Short-circuit current sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Toyoura 10 Ohana, Todo-cho, Hanazono-ku, Kyoto-shi, Kyoto Prefecture (72) Inventor Masao Mabuchi 10-Omuran, Todocho, Hanazono-ku, Kyoto-shi, Kyoto F term (reference) in the company 5F051 JA11

Claims (7)

[Claims] 1. A solar cell panel having a plurality of solar cell arrays in which solar cell modules are electrically connected to each other and arranged in a row, and supplying power to each of the solar cell rows to generate heat, and using the heat to generate heat. And a snow melting power supply means for melting snow on the solar cell panel, wherein the solar cell rows are arranged in parallel along a direction that is substantially horizontal when the solar cell panel is installed, and the snow melting power supply means is provided. , The power supply to each solar cell array is individually controlled in accordance with the progress of snow melting. 2. The photovoltaic power generation system according to claim 1, further comprising a detection unit for detecting the presence or absence of snow on the solar cell panel, wherein the snow melting power supply unit detects a detection result of the detection unit. A photovoltaic power generation system for controlling power supply to the photovoltaic array based on 3. The photovoltaic power generation system according to claim 2, wherein said detection means is provided for each region on said solar cell panel divided into one or a plurality of said solar cell columns. Solar power system. 4. A solar cell panel in which solar cell modules are arranged and arranged, and a power supply for supplying snow to each of the solar cell modules to generate heat, and using the heat to melt snow on the solar cell panel. And a short-circuiting means for individually short-circuiting each of the solar cell modules to the snow-melting power supply means in accordance with the progress of snow melting. 5. The photovoltaic power generation system according to claim 4, further comprising: a short-circuit current detecting unit that detects a short-circuit current of each of the solar cell modules short-circuited by the short-circuit unit. A photovoltaic power generation system that performs a short-circuit operation for each solar cell module based on a detection result of a short-circuit current detection unit. 6. A solar cell module comprising a plurality of solar cell arrays connected and arranged in a row, and the solar cell arrays are arranged in parallel along a horizontal direction at the time of installation. Solar panel. 7. A solar cell panel comprising short-circuit means for individually short-circuiting a plurality of solar cell modules.