JP2003023170A - Solar generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate or save the supply of a snow melting power from an external power source, and to increase power generating efficiency. SOLUTION: At the time of opening a switching contact 3, a DC voltage from a solar battery module 1 set on the roof of a building is converted into an AC voltage by a two-way power converter 8, and a DC voltage from a solar battery module 2 set on the wall of the building is converted into an AC voltage by a one-way power generator 9, and supplied to a load L (in a normal operation mode). At the time of closing the switching contact 3, the DC voltage from the solar battery module 2 is converted into an AC voltage by the one-way power generator 9, and converted into an AC voltage by the two-way power converter 8, and a forward voltage is supplied through the switching contact 3 to the solar battery module 1 so that the solar module 1 can be heated (in a snow melting operation mode). Therefore, it is possible to supply the snow melting power without depending on the external power source, and to improve cost performance. Also, it is possible to use surface reflected lights or residual snow reflected lights for the power generation, and to increase the power generation quantity.

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, and more specifically, it is not necessary to supply electric power from an external power source when the temperature of a solar cell module is raised due to snow melting, or the amount of supply is reduced. The present invention relates to a solar power generation system capable of increasing power generation efficiency during solar power generation.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing an example of a conventional solar power generation system. This solar power generation system 700 is
The solar cell module 1 installed on the roof surface of the building, the one-way power converter 78 that converts the DC power generated by the solar cell module 1 into AC power, and the solar cell module 1 is heated for snow melting. Heater 41 and heater control circuit 72 for controlling electric power supplied to the heater 41
It has and.

AC power is supplied from a one-way power converter 78 to a load L such as an electric light, a refrigerator or an air conditioner. When the AC power from the one-way power converter 78 is not sufficient, the commercial AC power supply P supplies the AC power to the load L. On the other hand, when the AC power from the one-way power converter 78 remains, it is possible to flow the power backward to the commercial AC power supply P side.

The following conventional techniques are known in relation to snow melting on solar cells. (1) Japanese Unexamined Patent Publication No. 9-23019 discloses a technique in which a heater is not required by utilizing the heat generated when an electric current is applied to a solar cell for snow melting, and a technique in which a direct-current conversion is bidirectional and a load side and A technique is disclosed in which power can be supplied to the solar cell side by a single power conversion device. (2) Japanese Unexamined Patent Application Publication No. 2000-12886 discloses a technique for automatically melting snow deposited and adhered to a lower solar cell array with electric power generated by an upper solar cell array which is not covered with ice and snow. It is disclosed.

[0005]

In the above conventional solar power generation system 700, it is necessary to bear the fee for the snow melting power supplied from the commercial AC power source P, which is an uneconomical problem. Further, the conventional technique disclosed in Japanese Patent Laid-Open No. 9-23019 has an advantage that the configuration is simple, but has a problem that the snow melting power depends on the commercial AC power source P. Further, in the conventional technique disclosed in Japanese Patent Laid-Open No. 2000-12886, there is a problem that it is difficult to obtain snow melting power when the entire surface of the vertically extending solar cell array is covered with snow. Furthermore, in any of the above-mentioned conventional techniques, power is generated only by sunlight falling on the roof surface, so power is generated when the usable area of the roof is limited or when a part of the roof is in the shadow of another building or the like. There is a problem of reduced ability.

Therefore, an object of the present invention is to provide a solar power generation system which can eliminate or reduce the supply of snowmelt power from an external power source and can enhance the power generation efficiency.

[0007]

According to a first aspect of the present invention, when the angle perpendicular to the horizontal plane is a positive angle and the opposite angle is a negative angle,
A first solar cell module installed so that the angle of the light receiving surface is −45 ° or more and + 45 ° or less, and a second solar cell module installed so that the angle of the light receiving surface is + 70 ° or more and + 110 ° or less. A solar module comprising: a module; and a snow-melting power supply means for supplying generated power of the second solar cell module as snow-melting power for melting ice and snow adhering to the first solar cell module. Provide a power generation system. In the solar power generation system according to the first aspect, since the first solar cell module has a relatively small inclination angle (-45 ° or more and + 45 ° or less) with respect to the horizontal plane, ice and snow easily attach to the light receiving surface. on the other hand,
Since the second solar cell module has a relatively large inclination angle (+ 70 ° or more and + 110 ° or less) with respect to the horizontal plane, ice snow is likely to slide off due to gravity, and ice snow is unlikely to adhere to the light receiving surface. Therefore, by using the generated power of the second solar cell module as the snowmelt power for melting the snow and snow adhering to the first solar cell module, it is not necessary to supply the snowmelt power from the external power source or the supply thereof. The amount can be saved. In addition to the sunlight falling on the first solar cell module, the sunlight and reflected light (especially the reflected light from the water surface and remaining snow) that hits the second solar cell module can be used to generate power, so Can be improved.

In a second aspect, the present invention provides a first solar cell module installed on a roof surface of a building, a second solar cell module installed on a wall surface of the building, and the second solar cell. The present invention provides a solar power generation system comprising: a snow melting power supply means for supplying power generated by the module as snow melting power for melting ice and snow adhering to the first solar cell module. In the solar power generation system according to the second aspect, since the first solar cell module is installed on the roof surface, ice and snow easily attach to the light receiving surface. On the other hand, since the second solar cell module is installed on the wall surface, there is a high possibility that ice and snow will slide down due to gravity, and ice and snow will not easily adhere to the light receiving surface. Therefore, by using the generated power of the second solar cell module as the snowmelt power for melting the snow and snow adhering to the first solar cell module, it is not necessary to supply the snowmelt power from the external power source or the supply thereof. The amount can be saved. In addition to the sunlight falling on the first solar cell module, the sunlight and reflected light (especially the reflected light from the water surface and remaining snow) that hits the second solar cell module can be used to generate power, so Can be improved.

According to a third aspect of the present invention, in the solar power generation system having the above-mentioned structure, the first solar cell module has the power generation state based on the difference between the power generation state of the second solar cell module and the power generation state of the second solar cell module. A solar power generation system comprising: an ice-snow detecting means for detecting ice-snow on a solar cell module of 1; and a control means for operating the snow-melting power supply means at the time of ice-snow detection. In the solar power generation system according to the third aspect, the difference between the power generation state of the first solar cell module and the power generation state of the second solar cell module in which ice and snow hardly adheres increases,
It is detected that ice and snow have adhered to the first solar cell module. That is, it is not necessary to separately provide an ice and snow sensor, and the cost can be reduced. From the standpoint of increasing the detection accuracy, it is preferable to adjust the detection reference according to the time zone (sun position). In addition, by automatically supplying snow melting power when ice and snow are detected, unmanned operation management and efficiency can be achieved.

According to a fourth aspect of the present invention, in the solar power generation system having the above-mentioned structure, the ice and snow detecting means includes the power generation pattern of the first solar cell module and the second power generation pattern.
The present invention provides a solar power generation system characterized by detecting the snow and ice by storing the power generation pattern of the solar cell module and periodically comparing the power generation patterns.
In the solar power generation system according to the fourth aspect, since the adhesion of ice and snow is detected by periodically comparing the power generation pattern of the first solar cell module with the power generation pattern of the second solar cell module, the sunlight intensity It is possible to reduce erroneous detection due to temporary fluctuation of

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this.

First Embodiment FIG. 1 is a block diagram showing a solar power generation system 100 according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a main part of the solar power generation system 100 of FIG. This solar power generation system 100 is installed on a roof surface of a building T and is a solar cell module 1 that generates power by sunlight falling on a light receiving surface.
And a solar cell module 2 that is installed on the wall surface of the building T and that generates electricity by sunlight reflected on the light-receiving surface and reflected light from the ground surface and the like. The inclination angle of the solar cell module 1 is
For example, + 20 ° with respect to the horizontal plane, and -45 ° or more +
It is 45 ° or less (no inclination is required). The inclination angle of the solar cell module 2 is generally + 90 ° with respect to the horizontal plane, and is + 70 ° or more and + 110 ° or less. From the viewpoint of increasing the amount of received light with respect to sunlight, it is preferable to install the solar cell modules 1 and 2 with the light-receiving surfaces facing the south side.

Further, a backflow prevention diode D1 for blocking a reverse current to the solar cell module 1, a switching contact 3 connected in parallel to the backflow prevention diode D1, and a backflow prevention diode for blocking a reverse current to the solar cell module 2. D2
And.

Further, a voltage detector 4 for detecting a DC voltage V1 from the solar cell module 1, a voltage detector 5 for detecting a DC voltage V2 from the solar cell module 2, and a voltage pattern of the DC voltages V1 and V2. And a temperature sensor 7 for detecting the surface temperature of the solar cell module 1 or the outside air temperature of the building T. The temperature sensor 7
Is preferably attached to the reinforcing plate lining the solar cell module 1 so as not to get wet by rain or snow. Further, the DC voltage V2 is preferably taken out from the uppermost cell of the solar cell module 2 in which ice and snow hardly adhere to the light receiving surface even during heavy snow.

Furthermore, the first port 8a is connected to the cathode of the backflow prevention diode D1, the second port 8b is connected to the commercial AC power source P side, and the DC voltage input to the first port 8a is converted into an AC voltage. And then the second port 8b
The bidirectional power converter 8 for converting the AC voltage output from the second port 8b into the DC voltage and outputting the DC voltage from the first port 8a, and the input port 9a including the backflow prevention diode D.
The one-way power converter 9 which is connected to the cathode of No. 2 and whose output port 9b is connected to the commercial AC power source P side and which converts the DC voltage input to the input port 9a into an AC voltage and outputs it from the output port 9b. To have. The bidirectional power conversion device 8 and the unidirectional power conversion device 9 may be integrated into the power conversion unit 10 of one unit.

FIG. 3 is a flow chart showing a solar power generation process with a snow melting function by the solar power generation system 100. In step S1, the control circuit 6 opens the switching contact 3 in the open state. As a result, the normal operation mode is set, and AC power is supplied from the bidirectional power conversion device 8 and the unidirectional power conversion device 9 to the load L such as a light, a refrigerator, and an air conditioner.
When the AC power from the bidirectional power converter 8 and the unidirectional power converter 9 is insufficient, the commercial AC power source P supplies the AC power to the load L. On the other hand, when the AC power from the bidirectional power conversion device 8 and the unidirectional power conversion device 9 is excessive, it is possible to flow the power backward to the commercial AC power supply P. In step S2, the control circuit 6 resets the timer that measures the elapsed time. Step S3
Then, the DC voltage V1 from the solar cell modules 1 and 2
When the waiting time required for V2 to stabilize has elapsed, the process proceeds to step S4. The waiting time is, for example, 30 seconds. In step S4, for example, after waiting for the sampling timing every 10 seconds, the process proceeds to steps S5 and S5 '.

Next steps S5 to S8 and step S
5'-S8 'are processes performed in parallel at the same time. In step S5, the control circuit 6 stores the voltage value of the DC voltage V1 from the solar cell module 1 in the power generation voltage pattern storage unit 6M. In step S6, the control circuit 6 integrates the stored voltage values. In step S7, the process proceeds to step S8 if the predetermined integration time has elapsed, and returns to step S4 if it has not elapsed. The integrated time is, for example, 10 minutes. In step S8, the control circuit 6
The voltage value average A is calculated by time-averaging the integrated voltage values. In steps S5 'to S8', the DC voltage V2 from the solar cell module 2 is subjected to the same processing as steps S5 to S8 to calculate the average voltage value B.

In step S9, the differential voltage is calculated by the average voltage value B-average voltage value A. Then, if the differential voltage ≧ α, it is determined that ice and snow may be attached to the solar cell module 1, and the process proceeds to step S10.
If it is not the differential voltage ≧ α, the process returns to step S2. The threshold value α for snow and snow determination is empirically determined according to the degree to which the voltage value average A when ice and snow adheres to the solar cell module 1 becomes smaller than the voltage value average B.

In step S10, the control circuit 6 determines whether or not the temperature detected by the temperature sensor 7 is within the snow melting compatible temperature range. If the temperature is within the snow melting compatible temperature range, the process proceeds to step S11, and the snow melting compatible temperature is determined. If it is not within the range, the process returns to step S2. When the temperature sensor 7 detects the surface temperature of the solar cell module 1, the snow melting compatible temperature range is, for example, a range of -1 ° C or more and + 7 ° C or less. That is, when the surface temperature is higher than + 7 ° C., it is highly possible that the differential voltage has increased due to adhered substances (dead leaves, dust, etc.) other than ice and snow, and therefore the snow melting process does not proceed. If there is snow, the surface temperature will be approximately 0 ° C, so the lower limit temperature is
-1 to 0 ° C is preferable. When the temperature sensor 7 detects the outside air temperature, the snow melting compatible temperature range is, for example, + 7 ° C.
The range is as follows. The temperature sensor 7 may be omitted and the process in step S10 may be omitted.

In step S11, the control circuit 6 switches the switching contact 3 to the closed state and uses the second port 8b of the bidirectional power converter 8 as an input port and the first port 8a.
Is controlled as an output port. Then, the DC voltage V2 from the solar cell module 2 is converted into an AC voltage by the unidirectional power converter 9, which is the bidirectional power converter 8.
Is converted into a DC voltage by the forward voltage, and the forward voltage is supplied to the solar cell module 1 via the switching contact 3, and the solar cell module 1 generates heat. Thereby, the solar cell module 1
The ice and snow adhering to the top melts. In step S12, the control circuit 6 waits until the snow melting processing time of, for example, several minutes to several tens of minutes elapses, and then returns to step S1. This snow melting treatment time is empirically set according to the region and snow quality so that the amount of snowfall is sufficiently melted.

According to the solar power generation system 100 according to the first embodiment described above, the power generated by the solar cell module 2 is supplied as snow melting power for melting the ice and snow adhering to the solar cell module 1, so that it is commercially available. The supply of snow melting power from the AC power supply P is unnecessary or can be saved. Also,
During normal operation, power is generated not only by the sunlight falling on the solar cell module 1 but also by the sunlight and reflected light that strikes the solar cell module 2. Therefore, the efficiency of power generation is improved especially when the reflectance is high due to water surface reflection or residual snow reflection. Can be higher

Instead of or in addition to the DC voltages V1 and V2 from the solar cell modules 1 and 2, a shunt resistance or an ammeter is used to measure the current, and the solar cell module 1 is calculated by including the current. The presence or absence of ice and snow may be determined. In this case, even if the voltage characteristic or the current characteristic changes due to the influence of temperature, the adhesion of ice and snow can be correctly detected.

-Second Embodiment- FIG. 4 is a configuration diagram showing a solar power generation system 200 according to a second embodiment of the present invention. This solar power generation system 2
At 00, the solar cell module developed on the roof surface is divided into an upper solar cell module 1u and a lower solar cell module 1d. In general, since the roof surface has an inclination, when the amount of snow is relatively small or when the snow melts due to solar heat, the snow adhering to the solar cell module 1u may slide down toward the solar cell module 1d due to gravity. There are many.

In the control circuit 26, the voltage detected by the voltage detector 4u, that is, the average voltage value of the DC voltage V1u from the solar cell module 1u, is detected by the voltage detector 4d, that is, the DC voltage V1d from the solar cell module 1d.
Of the solar cell modules 1u and 1d when the voltage value is higher than the average voltage value of
It is determined that only the ice and snow is attached to only one of them, and the switching contact 3d is switched to the closed state while keeping the switching contact 3u in the open state.

Then, the DC voltage V1u from the solar cell module 1u is converted into an AC voltage by the bidirectional power converter 8u, and the DC voltage V2 from the solar cell module 2 is converted into an AC voltage by the one-way power converter 9. , The combined AC voltage is converted into a DC voltage by the bidirectional power converter 8d, and the forward voltage is supplied to the solar cell module 1d via the switching contact 3d.
Heats up. As a result, the ice and snow adhering to the solar cell module 1d is melted. The bidirectional power converter 8
The u, 8d and the one-way power converter 9 may be integrated into one unit of the power converter 20.

According to the solar power generation system 200 according to the second embodiment described above, ice and snow adhering to the solar cell module 1d below the roof surface is covered by the upper solar cell module 1u and the wall surface not covered with ice and snow. Since the generated power of the solar cell module 2 melts, the snow melting efficiency can be further improved.

-Third Embodiment- FIG. 5 is a configuration diagram showing a solar power generation system 300 according to a third embodiment of the present invention. This solar power generation system 3
At 00, the control circuit 36 controls the bypass circuit 31 to be in the path state (solid line) for supplying the DC voltage from the solar cell module 1 to the one-way power converter 39 during normal operation. At this time, the DC voltages V1 and V2 from the solar cell modules 1 and 2 are converted into AC voltages by the one-way power converter 39 and supplied to the load L side.

Further, the control circuit 36 controls the bypass circuit 31 so that the rectified voltage from the rectifier circuit 32 is sent to the solar cell module 1 during the snow melting process (dotted line). At this time, the DC voltage from the solar cell module 2 is converted into an AC voltage by the one-way power converter 39 and rectified by the rectifier circuit 32, so that the solar cell module 1
Forward voltage is supplied to the solar cell module 1 to generate heat. As a result, the ice and snow adhering to the solar cell module 1 is melted.

According to the solar power generation system 300 of the third embodiment described above, by using the bypass circuit 31 and the rectifier circuit 32, an expensive bidirectional power converter (see FIG. 1).
No. 8) is unnecessary, and the cost can be reduced.

-Fourth Embodiment- FIG. 6 is a configuration diagram showing a solar power generation system 400 according to a fourth embodiment of the present invention. This solar power generation system 4
In 00, a heater 41 for heating the solar cell module 1 for snow melting and a heater control circuit 42 for controlling the operation of the heater 41 are provided.

During normal operation, the control circuit 46 converts the DC voltages V1 and V2 from the solar cell modules 1 and 2 into an AC voltage by the one-way power converter 49, and supplies the AC voltage to the load L side. To control.

During the snow melting process, the ice and snow adhering to the solar cell module 1 is melted using the electric power generated by the solar cell module 2. That is, the heater control circuit 42 supplies the snow melting power based on the AC voltage sent from the one-way power converter 49 to the heater 41.

According to the solar power generation system 400 of the fourth embodiment described above, since the solar cell module 1 is heated by the heater 41 during snow melting, it is necessary to supply a forward voltage for snow melting to the solar cell module 1. Disappears.

-Fifth Embodiment- FIG. 7 is a configuration diagram showing a solar power generation system 500 according to a fifth embodiment of the present invention. This solar power generation system 5
00 is the solar cell module 50u installed above the roof surface, the solar cell module 50d installed below the roof surface, and the solar cell module 2 installed on the wall surface.
And a one-way power converter 59 for converting a DC voltage into an AC voltage.

In the solar battery module 50u, a solar battery cell 51u is provided with a heater 52u and a bypass diode 5.
3u series circuits are connected in parallel. The solar cell module 50d includes a solar cell 51d, a heater 52
It is configured by connecting a series circuit of d and the bypass diode 53d in parallel.

In the solar power generation system 500, when the light receiving surfaces of the solar cell modules 50u, 50d, 2 are exposed to light, the DC voltage obtained by summing the electromotive force of each solar cell module is input to the one-way power converter 59. It is converted to an AC voltage and supplied to the load L side. If ice or snow adheres to one or both of the solar cell modules 50u and 50d, the heater 5 of the solar cell module will be
The series circuit of 2 and the bypass diode 53 is energized by a DC voltage from another solar cell module, and the heat of the heater 52 melts the ice and snow adhering to the solar cell module.

According to the solar power generation system 500 of the fifth embodiment described above, the generated power of the solar cell module (for example, 50u, 2) not covered with ice and snow is utilized,
Ice and snow attached to other solar cell modules (for example, 50d) will be automatically melted.

-Sixth Embodiment- FIG. 8 is a configuration diagram showing a solar power generation system 600 according to a sixth embodiment of the present invention. This solar power generation system 6
In 00, in the solar battery module 60u installed above the roof surface, a parallel circuit of the heater 52u and a thermostat 61u and a series circuit of the bypass diode 53u are connected in parallel with the solar battery cell 51u. In the thermostat 61u, the surface temperature of the solar cell module 60u is in a snow melting compatible temperature range (eg, -1
Within the range of ℃ to +7 ℃ below)
If it is not within the snowmelt compatible temperature range, it will be in the closed state. Further, in the solar cell module 60d installed below the roof surface, a parallel circuit of the heater 52d and the thermostat 61d and a series circuit of the bypass diode 53d are connected in parallel with the solar cell 51d. The thermostat 61d is in the open state when the surface temperature of the solar cell module 60d is within the snow melting compatible temperature range, and is in the closed state when it is not within the snow melting compatible temperature range. Therefore, when ice or snow adheres to one or both of the solar cell modules 60u and 60d, if the surface temperature is within the snow melting compatible temperature range, the series circuit of the heater 52 and the bypass diode 53 of the solar cell module, It is energized by a DC voltage from another solar cell module, and the heat of the heater 52 melts the ice and snow adhering to the solar cell module. On the other hand, if the surface temperature is not within the snow-melting compatible temperature range, the thermostat 61 conducts, so that no current flows through the heater 52.

According to the solar power generation system 600 of the sixth embodiment described above, when the surface temperature is within the snow melting compatible temperature range, the power generation of the solar cell module (for example, 60u, 2) not covered with ice and snow. The electric power is used to automatically melt the ice and snow adhering to the other solar cell module (for example, 60d). If the surface temperature is not within the snow melting compatible temperature range, no current will flow through the heater 52.
It is possible to prevent the inconvenience of wasting snow melting power when dead leaves, dust, and the like adhere to the solar cell module.

[0040]

According to the solar power generation system of the present invention, ice and snow adhering to a solar cell module installed on an installation surface with a small inclination (generally a roof surface) is installed on an installation surface with a large inclination (generally a wall surface). Since the generated power of the generated solar cell module is used for melting, the snow melting power does not have to depend on a paid external power source, which is economical. In addition, since the reflected light from the water surface and the reflected light from the remaining snow can be used for power generation, the power generation amount can be increased even when the total amount of sunlight falling on the roof is small.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a solar power generation system according to a first embodiment.

FIG. 2 is a perspective view showing a main part of the solar power generation system in FIG.

FIG. 3 is a flowchart showing a solar power generation process with a snow melting function by the solar power generation system of FIG.

FIG. 4 is a configuration diagram showing a solar power generation system according to a second embodiment.

FIG. 5 is a configuration diagram showing a solar power generation system according to a third embodiment.

FIG. 6 is a configuration diagram showing a solar power generation system according to a fourth embodiment.

FIG. 7 is a configuration diagram showing a solar power generation system according to a fifth embodiment.

FIG. 8 is a configuration diagram showing a solar power generation system according to a sixth embodiment.

FIG. 9 is a configuration diagram showing an example of a conventional solar power generation system.

[Explanation of symbols]

100, 200, 300 Solar power generation system 400, 500, 600 Solar power generation system 1, 1u, 1d, 50u, 50d Solar cell module 60u, 60d, 2 Solar cell module 3, 3u, 3d Switching contact 4, 4u, 4d, 5 Voltage detector 6, 26, 36, 46 Control circuit 6M, 26M Power generation voltage pattern storage unit 7 Temperature sensor 8, 8u, 8d Bidirectional power converter 9, 39, 49, 59 Unidirectional power converter 10, 20 Power converter Parts D1, D1u, D1d, D2, backflow prevention diode 31 bypass circuit 32 rectifier circuit 41, 52u, 52d heater 42 heater control circuit 51u, 51d solar cell 53u, 53d bypass diode 61u, 61d thermostat L load P commercial AC power supply V1 , V1u, V1d, V2 DC voltage

Claims (4)

[Claims] 1. When the angle in the direction perpendicular to the horizontal plane is a positive angle and the angle in the opposite direction is a negative angle, the angle of the light receiving surface is −45 ° or more and + 45 ° or less. The second solar cell module installed so that the angle of the light receiving surface is + 70 ° or more and + 110 ° or less, and the generated power of the second solar cell module is 1. A solar power generation system, comprising: a snow melting power supply means for supplying snow melting power for melting ice and snow attached to the first solar cell module. 2. A first solar cell module installed on a roof surface of a building, a second solar cell module installed on a wall surface of the building, and a power generated by the second solar cell module being the first solar cell module. And a snow-melting power supply means for supplying as snow-melting power for melting the ice and snow adhering to the solar cell module. 3. The solar power generation system according to claim 1 or 2, wherein the first power generation state of the first solar cell module is based on a difference between a power generation state of the second solar cell module and the power generation state of the second solar cell module. 2. A solar power generation system comprising: an ice-snow detecting means for detecting ice-snow on the solar cell module, and a control means for operating the snow-melting power supply means at the time of ice-snow detection. 4. The solar power generation system according to claim 3, wherein the ice and snow detection means stores a power generation pattern of the first solar cell module and a power generation pattern of the second solar cell module, and generates the powers thereof. A solar power generation system characterized by detecting ice and snow by periodically comparing patterns.