JP2000307144A - Solar cell array, method of repairing the same, and solar cell power generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a solar cell array which is enhanced in output power efficiency as a whole improved in degree of freedom of design so as to be preferable in structure, by a method wherein a solar cell array includes at least a solar cell module that is different in a rated current. SOLUTION: Not only A-type modules but also B-type modules (working width 400 mm × length 2 m, rated output 54 W) which are different from the A-type modules in a rated current, cell area, and module area are arranged in excess spaces 101. As mentioned above, 3 B-type modules 3 can be additionally provided besides 48 of A-type modules. The T-type modules and the B-type module are electrically connected together to constitute the same string of solar cells, by which three strings which are each composed of 16 A-type modules connected in series plus one B-type module connected in series are arranged in parallel, so that 51 solar cell modules can be installed in total. As a result, a rated output power of 3042 W can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solar cell array and a solar cell power generation system using the solar cell array.

[0002]

2. Description of the Related Art As global environmental problems have become more serious, solar energy has recently attracted a great deal of attention as clean energy that does not generate harmful by-products such as thermal power generation and nuclear power generation. It became so. Recently, the interconnection system for photovoltaic power generation systems for ordinary houses has become cheaper than before, and it is expected that the system will become more popular in the future.

When building a solar power generation system,
The solar cell module is electrically connected so that a desired voltage is obtained according to the characteristics of the solar cell module to form a solar cell string, and the solar cell strings are connected in parallel so that a desired output capacity is obtained. And a solar cell array.

In a system interconnection system, a selectable range of the number of series solar cell modules is determined according to an input voltage of a system interconnection inverter which is an output destination of a solar cell. Based on these, determine the number of solar cell modules in series and the number of parallel solar cell strings so that the desired capacity is obtained,
A solar cell array was configured.

[0005]

By the way, considering the current housing situation in Japan, the amount of power generated when the power generated by solar cells is sold by grid connection is larger than the power capacity purchased. There are very few houses that have solar cell installation area on the roof that can be expected. For this reason, we want to install solar cells in the roof space where the solar cell array is installed, but there are restrictions due to the shape and size of the solar cell module, restrictions due to solar cell characteristics, restrictions due to inverter input voltage, etc. However, it is difficult to efficiently construct a solar cell array capable of obtaining desired power.

[0006] Now, as an example of a general house having the above situation, consider installing a solar cell module on the roof of a house as shown in FIG. The solar module to be used is a vertical roof type module A type having an open voltage of 2 V and a short circuit current of 5 A shown in FIG.

[0007] Consider a case of installing a vertically laid A-type solar cell module on the roof as shown in FIG.

The input voltage range of the inverter is limited, and the number of selectable series is limited to 15 to 20 due to the characteristics of the solar cell module. as a result,
The number of actually installable solar cell modules is 15,
One of the multiples of 16, 17, 18, 19, and 20 must be selected. Thus, the maximum number of solar cell modules that can be installed is 16 solar cell strings × 3 parallel = 48 solar cell strings.

However, the solar cell installation area of this roof is 8.4 m wide × 6 m high = 50.4 m ² , but since the external size of the A type module is 500 mm × 2 m, three solar cells are arranged in the vertical direction. Just fits, but the horizontal direction is 0.5m x 1
6 = 8 m and 0.4 m surplus, so surplus space 101
Occurs.

As a result, a solar cell module cannot be installed in the surplus space 101, and a non-solar cell module is usually installed in the space.

Usually, in these extra spaces, a dummy module having the same shape as the solar cell module and no solar cell is used, or a general roofing material such as metal of the same shape is installed. There is a problem that the difference in appearance is easy to see, which is not desirable in the roof design, and that the amount of power generation cannot be sufficiently used in the limited space to waste the space where the solar cell module can be installed. Was.

An object of the present invention is to provide a solar cell string in which modules having different current ratings are combined so that the output power of the entire solar cell array can be efficiently obtained in a limited area in which the solar cell module can be installed. It is another object of the present invention to provide a method of forming a solar cell array having a high degree of freedom in design, which enables a preferable structure in terms of design.

[0013]

Means for Solving the Problems In order to solve the above problems, the present inventors constructed a solar cell array in which at least one solar cell module having a different current rating was arranged, and maximized the output power of the solar cell array. By using a solar cell power generation system that supplies power to a load via a power conversion unit equipped with a power tracking device, the power generation as a whole can be improved in a solar cell array installed on a limited installation surface. Was found.

According to the present invention, as shown in FIG. 2, for example, only 48 A-type vertical solar cell modules can be installed so far. Considering that, in addition to the 48 conventional A-type modules, a narrow B-type module (FIG. 5) can be installed in the surplus space as shown in FIG.

[0015] As described above, although the same vertical type module of the A type and the B type is used, the current rating, the cell area,
By connecting photovoltaic modules with different module areas in series, it is possible to install the photovoltaic module without creating unnecessary extra space on the surface where the photovoltaic module can be installed.
Since the solar cell module can be installed on the entire roof surface, the degree of freedom in design is greatly increased, and the design and appearance are extremely excellent, and the output is increased.

By using the building material integrated solar cell module, it is possible to design a solar cell array which can be installed in a larger area and which has an excellent appearance with emphasis on design. It is not necessary to previously install a gantry or the like, and the solar cell module can be directly installed.

Further, from the viewpoint of sunlight reception, more solar radiation can be obtained by installing on the roof surface. In addition, since a solar cell array with excellent design can be designed, a roof with very high design can be obtained.

Although the output of the solar cell array fluctuates considerably depending on the amount of solar radiation, temperature, etc., the operating point voltage and operating point current of the solar cell array are fluctuated, and the power fluctuation at the time of the fluctuation is examined. Maximum power tracking control for tracking the operating point near or at the maximum power of the battery array, so-called MP
The maximum output of the solar cell array can always be obtained by using a solar power generation system in which the maximum power tracking device that performs PT control is mounted in the power conversion device.

The present invention is based on the following findings obtained from the study of the present inventors.

The characteristics of a general solar cell are generally represented by a current (I) -voltage (V) characteristic as shown in FIG. The current value at the intersection with the vertical axis is the short-circuit current (Isc), and the voltage value at the intersection with the horizontal axis is the open-circuit voltage (Voc). In the IV characteristic of the solar cell, the point at which operation in the IV line operates depends on the resistance value of the load. Several straight lines in FIG. 6 indicate operating points corresponding to some resistors (R1, R2, R3), the operating current at that time is called Iop, and the operating voltage is called Vop.

Since the product of the current value (Iop) and the voltage value (Vop) at each operating point is the power supplied to the load, the power value (Pop) at a certain operating point (R2) is as shown in FIG. It is represented by the area of a rectangle shown by oblique lines inside.

FIG. 7 shows the power value corresponding to each point of the curve as a voltage function, and the power value becomes maximum at a certain operating point. This maximum value is called the maximum power (Pmax) that can be supplied to the load under a constant illuminance, and the current value and the voltage value corresponding to Pmax are the optimum operating current (Imp),
It is called the optimum operating voltage (Vmp).

Generally, various characteristic values relating to these IV characteristics are shown as values under the conditions of AM 1.5, 100 mV / cm ² and 25 ° C.

Here, when a solar cell array is constructed by combining solar cell strings having different solar cell characteristics,
A drop in output due to the inability to match the IV curve, a so-called “IV mismatch loss” occurs. Therefore, when a solar cell array has been configured, solar cell modules having the same output characteristics have been connected in series to form a solar cell string, and solar cell strings having the same output characteristics have been connected in parallel.

However, in a case where a solar cell array is formed by combining solar cell strings having different solar cell characteristics, and the deviation of the optimum operating voltage of each solar cell string is relatively small, the optimum operating voltage of the solar cell array is reduced. It is located between the optimal operating voltages of each solar cell string. Therefore, the amount of voltage deviation from the optimal operation voltage of the solar cell array viewed from the optimal operation voltage of each solar cell string is smaller than the voltage deviation between the solar cell strings. Therefore, the power reduction due to the IV mismatch can be suppressed to a level having no practical problem.

In particular, when the deviation of the optimum operating voltage of each solar cell string is small, the voltage (V) of the solar cell array
The power (P) characteristic curve has only one peak; Therefore, the IV mismatch loss is further suppressed, the power is hardly reduced, and a highly efficient solar cell array can be configured.

Further, by providing a system for supplying power to a load via a power converter equipped with a maximum power follower, a maximum output can always be obtained as a solar cell array.

For example, as shown in FIG.
Consider a solar cell array that incorporates a low-rated solar cell module with an open-circuit voltage of 1 V and a short-circuit current of 0.5 A into a solar cell array using a standard solar cell module with a V and short-circuit current of 1 A.

First, a solar cell string I in which five 1V and 1A solar cell modules and two 1V and 0.5A solar cell modules are connected in series,
In the case of a solar cell array (a) in which solar cell strings II in which seven solar cell modules of V and 1A are connected in series, the voltage (V) -power (P) characteristic of the entire solar cell array (a) is shown in FIG. It looks like 9.

At this time, the optimum operating voltage of the solar cell string I is 3.2719 V, and the optimum operating voltage of the solar cell string II is 5.1864 V. Therefore, the voltage difference between the solar cell strings is very high at 1.9145 V. large.
The optimum operating voltage of the solar cell array (a) is 5.390.
Since the voltage is 0 V, the “voltage shift amounts” between the solar cell array (a) and the respective optimum operating voltages of the solar cell strings I and II are 2.1181 V, respectively.
This is a solar cell array whose voltage is 3.4755 V and the “voltage shift amount” between the solar cell array (a) and each string is very large. Note that the maximum power is 6.9106W.

At this time, the IV mismatch loss is 14.38.
The solar cell array configuration is very large, 3%, and very inefficient.

As another example, Voc = 1V, Is
c = 1A standard solar cell module into 5 modules,
A solar cell string III in which two solar cell modules having a small current rating of Voc = 1V and Isc = 0.9A are connected in series, and a solar cell string I in which seven 1V and 1A solar cell modules are connected in series
In the case of the solar cell array (b) in which V is connected in parallel, the voltage-power characteristics of the entire solar cell array (b) are as shown in FIG.

At this time, the optimum operating voltage of the solar cell string III is 5.2344 V, and the optimum operating voltage of the solar cell string IV is 5.1864 V. Therefore, the voltage deviation between the respective solar cell strings is very low at 0.048 V. It is kept small. Further, since the optimum operating voltage of the solar cell array (b) is 5.2220 V, the “voltage shift amounts” between the solar cell array (b) and the optimum operating voltages of the solar cell strings III and IV are each 0. .
0124V and 0.0356V. The maximum power is 8.5224 W.

The IV mismatch loss at this time is 0.535
%, It can be seen that the array configuration is very efficient.

Comparing the above two examples, the solar cell array (b) has a much smaller "voltage shift amount" and a very small IV mismatch loss than the solar cell array (a). It can be seen that the solar cell array configuration is highly efficient.

As described above, by configuring the solar cell array within a range where the power peak is one, the difference in the current rating of the installed solar cell module can be excluded from the restrictions of the array configuration, and the cell area can be reduced. In addition, it is possible to install solar cells which are preferable in terms of design and module area. This method is effective to reduce the IV mismatch loss and to generate the output power of the entire array more efficiently, particularly when a device having a small current rating is incorporated in the solar cell array.

In the case of a solar cell having a low fill factor (FF), for example, in the case of an amorphous silicon solar cell, the shape of an IP characteristic curve near an optimum operating point is gentle, and in particular, a reduction in power is suppressed. Is more suitable.

Further, since solar cell modules having different current ratings can be installed on the same solar cell array, it is possible to install solar cells on the installation surface as much as possible without generating extra space on the installation surface of the solar cell array. In addition, in the case of a building material integrated solar cell such as a roofing material integrated solar cell, the solar cell module can be installed on the entire surface on which the solar cell can be installed, which is particularly preferable.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a solar cell array according to the present invention and a photovoltaic power generation system using the solar cell array will be described. Note that the present invention is not limited to this example.

An example of the configuration of the solar cell array according to the present invention will be described with reference to FIGS.

FIG. 12 shows a photovoltaic array 5-1 on the roof surface of a certain house (solar cell installation area length 6 m × width 7 m).
FIG. 2 mx 2 horizontal used here
In the case of the crystalline solar cell module (i) with an aluminum frame having a length of 12 m, there is an area in which 12
X An extra space 501 with a width of 1 m is generated.

According to the present invention, as shown in FIG.
X By installing three crystalline solar cell modules (ii) with an aluminum frame of 1 m width, a total of 15 solar cell modules (ii) can be installed, and the solar cell array 5-2 can be configured. The solar cell module (i) and the solar cell module (ii) are not only different in the area of the solar cell module but also in the current rating, the cell area, and the electric characteristics of the cell.

As described above, the solar cell module (i) and the solar cell module (ii) having different electric characteristics are connected in series to form a solar cell string, and the solar cell array in which these are connected in parallel is installed. In this configuration, the solar cell module can be installed in the entire area where the solar cell module can be installed.

Next, FIG. 14 shows an example of the configuration of a photovoltaic power generation system to which the present invention is applied, taking the above-mentioned solar cell array 5-2 as an example.

The solar cell module is electrically connected to form a solar cell string so as to obtain a desired voltage, and the solar cell strings are connected in parallel so as to obtain a desired output capacity to form a solar cell array 5-2. Constitute.

The output power of each solar cell string in the solar cell array 5-2 is collected in a junction box 505 via a blocking diode for preventing a reverse current caused by the amount of solar radiation and a characteristic difference between each string. The maximum power of the solar cell array 5-2 is always supplied to the load 507 via the power converter 506 equipped with the power follower. The load 507 includes an electric heat load, a motor load, a commercial AC system, and a combination thereof.

(Solar Cell) The solar cell used in the solar cell array of the present invention is not particularly limited. As the silicon semiconductor, a monocrystalline silicon semiconductor, a polycrystalline silicon semiconductor,
A microcrystalline silicon semiconductor, an amorphous silicon semiconductor, or the like can be used. As the compound semiconductor, a III-V compound semiconductor, a II-VI compound semiconductor, an I-III-V
Group I compound semiconductors and the like can be used.

(Solar Cell Module) The form of the solar cell module of the present invention is not particularly limited, and may be a building material integrated type such as a tiled roof type or a horizontal type, a replaceable type, a detachable type, or a conventional aluminum frame. There are various forms such as attached type.

It should be noted that the building material-integrated solar cell module referred to here is not a type in which a gantry or the like is installed on an existing roof and the solar cell module is mounted thereon, but the solar cell module itself functions as a roof material. In addition, it has the function of a solar cell. Therefore, the solar cell module can also function as a roof, so that the total cost can be reduced, and since the appearance can be processed into the same shape as the conventional roof, the existing building can be used. There is no sense of incompatibility with the object, and the design freedom can be increased.

Also, the detachable and replaceable solar cell module means that once an array is installed, a failure occurs,
A type in which a failed solar cell module can be removed and replaced with a new solar cell module easily. It can be replaced one by one, and is excellent in maintainability.

(Solar Cell String) The solar cell string of the present invention refers to a group in which the solar cell modules are connected in series and parallel in order to obtain a desired voltage / current value.

(Solar Cell Array) The solar cell array of the present invention refers to the entirety of the solar cell strings connected in parallel in order to obtain a desired voltage / current value.

In general, a solar cell module is simply a module, a solar cell string is simply a string,
The solar cell array may be simply referred to as an array.

(Bypass Diode) A partial shade is assumed for a solar cell module, and when a certain solar cell or solar cell module is shaded, the current is extremely lower than the current of another solar cell or solar cell module. In order to prevent a reverse bias from being applied to the solar cell in such a case, a bypass diode is provided in the solar cell.

The types of bypass diodes of the present invention include, but are not limited to, cuprous oxide rectifiers, selenium rectifiers, point contact diodes, bond diodes, alloy (alloy) junction diodes, diffusion junction diodes, and growth junction diodes. Applicable.

(Blocking Diode) When the voltages of a plurality of solar cell strings are extremely different due to a solar radiation condition such as a partial shade or the like, a backflow may flow to a solar cell string having an extremely low voltage. In order to prevent the backflow, a blocking diode is provided in each junction box in each solar cell string.

The types of blocking diodes of the present invention include, but are not limited to, cuprous oxide rectifiers, selenium rectifiers, point contact diodes, bond diodes, alloy (alloy) junction diodes, diffusion junction diodes, and growth junction diodes. Applicable.

(Installation Surface) The installation surface in the present invention is not particularly limited, and refers to all surfaces and places where solar cells can be installed. Specifically, roofs (eaves, buildings,
It is all places where solar cell modules can be installed, such as roofs, verandas, balconies, carports, soundproof walls, or solar cell mounts, etc., from the viewpoint of effective use of sunlight. And particularly preferably a roof surface.

(Power Converter) The power converter is not particularly limited, and includes a power transistor and a power MOSFET.
DC / DC converter using self-extinguishing type switching device such as T, IGBT, GTO, etc., self-excited DC / AC
There are inverters, etc. This power converter can control power flow, input / output voltage, output frequency, and the like by controlling ON / OFF of a gate path.

(Maximum power tracking device)
The amount of power generated by each solar cell string varies depending on various conditions such as solar radiation and temperature. As a result, the maximum output operating voltage of the solar cell array changes due to the difference in the ratio of the amount of power generated by each solar cell string, but the operating point of the solar cell array is controlled so that the output of the solar cell array is maximized. And is usually mounted in the power converter.
Also, the maximum power following is called MPPT control,
The device is also called an MPPT control device.

(Connection Box) This is a device that collects the current of each solar cell string and supplies it to the power converter.

[0062]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a solar cell array according to the present invention and a solar power generation system using the solar cell array will be described below. Note that the present invention is not limited to this example.

(Example 1) An example of a solar cell array configuration and output characteristics of the array according to the present invention will be described.

FIG. 1 is a schematic perspective view of a general house provided with a roof on which the solar cell array of the present invention is installed. FIG. 2 is a conceptual view of the southern surface of the roof on which the solar cell array 1 is arranged by a conventional installation method. FIG. 3 is a conceptual diagram of the southern surface of the roof on which the solar cell array 2 installed using the means according to the present invention is arranged;
FIG. 4 is a graph showing the output characteristics of the solar cell array 2 of FIG. 3 and each of the solar cell strings constituting the same, and FIG.
4 is a conceptual diagram of a solar cell module constituting the solar cell array of FIG. 3.

The south side of the roof shown in FIG. 1 has a height of 6 m and a width of 8.4.
It has a solar cell module installation surface of m = 50.4 m ² .

Here, a solar cell array configuration based on the conventional installation method shown in FIG. 2 will be considered.

When a vertically-floating amorphous silicon solar cell module A type having a working width of 500 mm and a length of 2 m (rated output: 60 W) is installed on the south side of the roof, the vertical length is 3 mm.
A total of 48 sheets of 16 sheets can be installed on the step and side. When the input voltage range of the inverter to be used is 250 to 350 V, considering the voltage of the solar cell module,
Forty-eight modules of “A type module 16 series × 3 parallel” can be installed, and a rated output of 2880 W can be obtained. However, in this case, a surplus space 101 in which the solar cell module cannot be installed occurs.

Next, as shown in FIG. 3, using the means of the present invention, not only the A-type module but also a B-type module having a different current rating, cell area and module area (working width 400 mm × length 2 m, rating The output 54W) is arranged in the surplus space 101. In this way, three B type modules can be additionally installed in addition to 48 A type modules. By electrically connecting these A-type modules and B-type modules to form the same solar cell string, “(A-type module 16 series + B-type module 1 series) × 3 parallel” can be obtained, for a total of 51 solar cell modules Can be installed. The voltage of each solar cell string falls within the input voltage range of the inverter. As a result, a rated output of 3042 W can be obtained.

The B-type module is a vertical-roof type module having the same shape as the A-type module, but has a cell area of 90% and a module area of 80% of the A-type module. The short-circuit current (Isc) of each of the A-type and B-type modules is 5 A and 4.5, respectively.
A. The open circuit voltage (Voc) is 20V
Is the rated value. Using these rated values, a simulation of the array output actually installed under certain solar radiation and temperature conditions is performed.

First, a simulation is performed on the solar cell array 1 of the conventional installation method shown in FIG. Note that a bypass diode is arranged in each solar cell module. In this simulation, no IV mismatch loss including the bypass diode loss occurs.
The output of the string of “A type module 16 series” is 993.4 W, and the total output of the entire solar cell array 1 in which the strings are arranged in three parallel is 2980 W.

Next, a simulation is performed on the solar cell array 2 in the installation method using the means of the present invention shown in FIG. Note that a bypass diode is arranged in each solar cell module. In this simulation, the IV mismatch loss including the bypass diode loss is considered.

FIG. 4 shows a voltage (V) -power (P) characteristic and a voltage (V) -current (I) characteristic of the solar cell array 2 shown in FIG. 3 and each of the solar cell strings constituting the same. The horizontal axis represents voltage, the vertical axis represents power on the left side, and the current on the right side. (B) in the figure is “A type module 16 series + B
(A) of the string of “type module 1 series” shows (V)-(P) characteristics of the solar cell array 2 in which the strings are connected in three parallel. Also, (d) in FIG.
(C) of the string of “type module 16 series + B type module 1 series” shows the (V)-(I) characteristics of the solar cell array 2 in which the strings are connected in three parallel.

The optimum operating voltage (Vm) of (a) and (b)
p) are 253.600 V and 253.640 V, respectively, and the “voltage shift amount” is 0.040 V, which is almost the same. In addition, there is only one power peak, and the IV mismatch loss of the solar cell array 2 at this time is 0.426%, which is a very efficient solar cell array configuration. The total output of the entire solar cell array 2 at this time is 314.5 W.

Therefore, the conventional solar cell array 1 composed of only the A type module and the B type module having different current rating, cell area, cell electric characteristics and module area are arranged in the extra space, and are connected in series with the A type module. When comparing the connected solar cell array 2 according to the present invention, the solar cell array 2
The power increased by 55 W.

That is, in the conventional method, there was an extra space in which the solar cell module could not be installed even though there was an installation area, but the A type module was connected in series with the B type module having different current rating, cell area and module area. It can be seen that, by configuring the connected solar cell strings, the solar cell modules can be installed in the surplus space, and the overall output has greatly increased.

In addition, it is considered that the B type module having a small current rating may be in a partial shade state depending on the location conditions. At this time, a reverse bias is applied to some of the solar cell modules in the same solar cell string. Easy to flow. However, by arranging the bypass diode in each solar cell module, it was possible to prevent a reverse bias from flowing. Similarly, if the voltage of each solar cell string falls into an extremely different state,
Although a reverse current is about to flow, each solar cell string
By arranging the blocking diode as in 4,
Backflow was prevented.

The solar cell array 2 thus configured can arrange solar cell strings in which solar cell modules having different current ratings, cell areas, and module areas are connected in series. By effectively utilizing the installation area, the output capacity of the solar cell can be greatly increased. Further, in solar cell array design, the degree of freedom in design has been greatly increased, and more solar cell modules can be installed, so that the overall output can be greatly increased.

(Example 2) Another example of the configuration of the solar cell array of the present invention and the output characteristics of the array will be described.

FIG. 15 is a perspective conceptual view of a general house provided with a roof on which the solar cell array of the present invention is installed, and FIG. 16 is a conceptual view of the southern surface of the roof where the solar cell array 3 is arranged by a conventional installation method. FIG. 17 is a conceptual diagram of the roof south surface on which the solar cell array 4 installed by using the means according to the present invention is arranged, and FIG. 18 shows the output characteristics of the solar cell array 4 of FIG. 17 and each solar cell string constituting the same. The graph and FIG. 19 are conceptual diagrams of the solar cell modules constituting the solar cell arrays of FIGS. 16 and 17.

The south side of the roof shown in FIG.
It has a solar cell module installable area of 8m in width = 44.4m ² .

Here, a solar cell array configuration based on the conventional installation method shown in FIG. 16 will be considered.

In the case where an amorphous silicon solar cell module D having a working width of 400 mm × length 2.5 m (rated output: 60 W) is installed on the south side of the roof, a total of 39 rows of 13 rows and 39 rows are provided. Can be installed. When the input voltage range of the inverter to be used is 250 to 350 V, considering the voltage of the solar cell module,
39 "D type modules 13 series x 3 parallel" can be installed, and a rated output of 2340W can be obtained. However, in this case, a surplus space 601 in which the solar cell module cannot be installed occurs.

Next, as shown in FIG. 17, using the means of the present invention, not only a D-type module but also a C-type module having a different current rating, cell area and module area (working width 320 mm × length 2.5 m, Rated output 54W)
In the surplus space 601. In this manner, three C-type modules can be additionally installed in addition to 39 D-type modules. By connecting these C-type modules and D-type modules to form the same solar cell string, “D-type module 1
4 series × 2 parallel ”and“ (D type module 11 series + C type module 3 series) × 1 parallel ”, and a total of 42 solar cell modules can be installed. The voltage of each solar cell string falls within the input voltage range of the inverter. As a result, a rated output of 2502 W can be obtained.

The C type module is a horizontal roofing type module having the same shape as the D type module. However, the cell area is 90% and the module area is 80% of the D type module. The short-circuit current (Isc) of each of the C-type and D-type modules is 4.5 A and 5 A, respectively.
A. The open circuit voltage (Voc) is 20V
Is the rated value. Using these rated values, a simulation of the array output actually installed under certain solar radiation and temperature conditions is performed.

First, a simulation is performed for the solar cell array 3 of the conventional installation method shown in FIG. Note that a bypass diode is arranged in each solar cell module. In this simulation, no IV mismatch loss including the bypass diode loss occurs. The output of the string of “D-type module 13 series” is 807.2 W, and the total output of the entire solar cell array 3 in which the strings are arranged in parallel is 2421.4 W
It is.

Next, a simulation is performed on the solar cell array 4 in the installation method using the means of the present invention shown in FIG. Note that a bypass diode is arranged in each solar cell module. In this simulation, the IV mismatch loss including the bypass diode loss is considered.

FIG. 18 shows the solar cell array 4 shown in FIG.
And the voltage (V) of each solar cell string that constitutes it-
The graph shows a power (P) characteristic and a voltage (V) -current (I) characteristic, wherein the horizontal axis represents voltage, the vertical axis represents power on the left side, and the right side represents current. (B) in the figure is "D type module 14 series"
(C) of the string of “(D type module 11
Series + C type module 3 series) "
(A) is the (V)-(P) characteristic of the entire solar cell array 4 in which the three strings are connected in parallel. In the drawing, (e) is a string of “D-type module 14 series”, (f) is a string of “(D-type module 11 series + C-type module 3 series)”, and (d) is the three strings. Are the (V)-(P) characteristics of the entire solar cell array 4 in which are connected in parallel.

The optimum operating voltage (Vmp) in FIG.
At 8.32V, located between Vmp = 207.46V in (b) and 209.56V in (c);
"Voltage shift amount" with the solar cell array 4 is 0.86 each.
V and 1.24 V are very small. Also,
There is only one power peak. The IV mismatch loss at this time is suppressed to 0.324%, which is a very efficient solar cell array configuration. The total output of the solar cell array 4 at this time is 2580.7 W.

Therefore, according to the present invention, the conventional solar cell array 3 composed of only the D-type module and the C-type module having different current rating, cell area and module area are arranged in the extra space and connected in series with the D-type module. When the solar cell array 4 was compared, the output of the solar cell array 4 increased by 159.3 W as compared with the solar cell array 3.

That is, in the conventional method, there is a surplus space in which the solar cell module cannot be installed even though there is an installation area, but the C type differs from the D type module in the current rating, the cell area, the cell electrical characteristics, and the module area. It can be seen that, by configuring the solar cell string in which the type module and the type module are connected in series, the solar cell module can be installed in the surplus space, and the overall output is greatly increased.

In addition, it is considered that a C-type module having a small current rating may be in a partial shade state depending on the location conditions. At this time, a reverse bias is applied to some of the solar cell modules in the same solar cell string. Easy to flow. However, by arranging the bypass diode in each solar cell module, it was possible to prevent a reverse bias from flowing. Similarly, if the voltage of each solar cell string falls into an extremely different state,
Although a reverse current is about to flow, each solar cell string
By arranging the blocking diode as in 4,
Backflow was prevented.

In the solar cell array 4 configured as described above, it is possible to arrange solar cell strings in which solar cell modules having different current ratings, cell areas, and module areas are connected in series. By effectively utilizing the installation area, the output capacity of the solar cell can be greatly increased. Further, in solar cell array design, the degree of freedom in design has been greatly increased, and more solar cell modules can be installed, so that the overall output can be greatly increased.

(Embodiment 3) An example of the structure of a solar cell array according to the present invention and output characteristics of the array will be described below using a simplified model.

As shown in FIG. 20, the installation surface used in this embodiment is 400 mm wide × 340 mm long.
Use a model roof of the size. The modules used are the E-type module and the F-type module shown in FIG.

The solar cell array 5 shown in FIG. 21 is an E type module (external size: 200 mm in width) by a conventional installation method.
X 50 mm, open voltage: 1 V, short circuit current: 1 A). In this case, a surplus space 701 where the solar cell module cannot be installed occurs.

Next, as shown in FIG. 22, using the means of the present invention, not only the E type module but also the current rating
F type modules with different module areas (outside dimensions: 200 mm wide x 40 mm long, open voltage: 1 V, short circuit current:
0.9A) in the extra space 701, one F-type module and one E-type module are connected in parallel,
Connect them in series. Further, a string connected in series with four E-type modules is formed. In addition, a string consisting of six E-type modules connected in series is constructed,
The solar cell array 6 is configured by connecting these two strings in parallel. As a result, a surplus space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating a surplus space. Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

Using the above rated values, similar to the first embodiment,
As a result of simulating the array output of the solar cell array 5 and the solar cell array 6 under certain solar radiation and temperature conditions, the maximum output power (Pmax) of the solar cell array 5 is 7.4506 W, and the Pmax of the solar cell array 6 is 7.7
At 593 W, the IV mismatch loss was 9.4%, and the output power of the solar cell array 6 using the means of the present invention increased by 0.3087 W (about 4%) as compared with the conventional solar cell array 5. Also, there was only one power peak.

That is, in the conventional method, there was a surplus space in which the solar cell module could not be installed even though there was an installable area, but the F type was different from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. By constructing a solar cell string in which type modules are connected in series / parallel, the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.

(Embodiment 4) As shown in FIG. 23, using the means of the present invention, not only E-type modules but also F-type modules having different current ratings and module areas are used on the same installation surface as in Example 3. Two strings are arranged in the surplus space 701, one F-type module and one E-type module are connected in parallel, and they are connected in series with five E-type modules. The solar cell array 7 is configured by connecting these two strings in parallel. As a result, a surplus space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating a surplus space.
Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

Using the above rated values, as in the first embodiment,
As a result of simulating the array output of the solar cell array 7 under certain solar radiation and temperature conditions, Pmax was 7.7.
427 W, the IV mismatch loss is 8.305%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.4)
506 W), the output power of the solar cell array 7 using the means of the present invention increased by 0.2921 W (about 4%). Also, there is only one power peak.

That is, in the conventional method, there is a surplus space in which the solar cell module cannot be installed even though there is an installable area, but the F type is different from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. By constructing a solar cell string in which type modules are connected in series / parallel, the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.

(Embodiment 5) As shown in FIG. 24, using the means of the present invention on the same installation surface as in Embodiment 3, not only E-type modules but also G-type modules having different current ratings and module areas ( Outside dimensions: width 200 mm x length 90
mm, open-circuit voltage: 1 V, short-circuit current: 1.9 A) are arranged in a surplus space 701, and a string in which two G-type modules and four E-type modules are connected in series, and a string in which six E-type modules are connected in series Are configured. The solar cell array 8 as shown in FIG. 24 is configured by connecting these two strings in parallel. As a result, a surplus space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating a surplus space. Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

Using the above rated values, as in the first embodiment,
As a result of simulating the output of the solar cell array 8 under certain solar radiation and temperature conditions, Pmax was 7.7.
488 W, the IV mismatch loss is 8.233%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.4)
506 W), the output power of the solar cell array 8 using the means of the present invention increased by 0.2982 W (about 4%). Also, there is only one power peak.

That is, in the conventional method, there is a surplus space in which the solar cell module cannot be installed even though there is an installable area, but the G type is different from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. Solar cell array 8 in which type modules are connected in series
With this configuration, the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.

(Embodiment 6) As shown in FIG. 25, using the means of the present invention, not only E-type modules but also G-type modules having different current ratings and module areas are mounted on the same installation surface as in Example 3. The solar cell array 9 is configured by arranging two strings in which one G-type module and five E-type modules are connected in series, and the two strings are connected in parallel. As a result, a surplus space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating a surplus space. Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

Using the above rated values, as in the first embodiment,
As a result of simulating the output of the solar cell array 9 under certain solar radiation and temperature conditions, Pmax was 7.7.
427 W, the IV mismatch loss is 8.305%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.4)
506 W), the output power of the solar cell array 9 using the means of the present invention increased by 0.2921 W (about 4%). Also, there is only one power peak.

That is, in the conventional method, there is a surplus space where the solar cell module cannot be installed even though there is an installable area, but G is different from the E type module in current rating, cell area, cell electric characteristics, and module area. Solar cell array 9 in which type modules are connected in series
With this configuration, the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.

(Embodiment 7) In this embodiment, an example of a method for repairing a solar cell array will be described. The solar cell module in this example is a replaceable module.

Since two modules in the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 26, when replacing a new solar cell module, it is not necessary to simply replace it with a new E type module. By using the means of the present invention, an H-type module having the same outer dimensions, higher power generation efficiency, high current rating and large output power (external dimensions:
(200 mm wide x 50 mm long, open voltage: 1 V, short-circuit current: 1.2 A) Replaced and repaired, re-arranged, a string of 6 E-type modules in series, 2 H-type modules, and 4 E-type modules Two of the strings connected in series were connected in parallel to form a solar cell array 10. The voltage of each solar cell string falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.

Using the above rated values, similar to the first embodiment,
As a result of simulating the array output of the solar cell array 10 under certain insolation and temperature conditions, Pmax was 7.
6079W, the IV mismatch loss is 1.183%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 10 using the means of the present invention increased by 0.1573 W (about 2%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, it is replaced with an H-type module having the same outer dimensions as the E-type module, a higher current rating, and a larger output power. Solar cell module 10
With this configuration, the output power can be increased as compared with the previous solar cell array 5 including only the E type module. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement as described above and enables repairs, but also uses the means of the present invention to greatly increase output power. It became possible to increase.

Embodiment 8 In this embodiment, an example of a method for repairing a solar cell array will be described. The solar cell module in this example is a replaceable module.

Since two modules of the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 27, when replacing a new solar cell module, it is not necessary to simply replace it with a new E-type module. Using the means of the present invention, replace and replace the H type module having the same outer dimensions, higher power generation efficiency, and higher current rating and output power, and replace it with five E type modules and one H type module. Were connected in series, and the strings were connected in parallel to form a solar cell array 11. The voltage of each solar cell string falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.

Using the above rated values, similar to the first embodiment,
As a result of simulating the array output of the solar cell array 11 under certain solar radiation and temperature conditions, Pmax was 7.
6013W, the IV mismatch loss is 1.269%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 11 using the means of the present invention increased by 0.1507 W (about 2%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, it is replaced with an H type module having the same outer dimensions as the E type module, a higher current rating, and a larger output power. Solar cell array 11
With this configuration, the output power can be increased as compared with the previous solar cell array 5 including only the E type module. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement as described above and enables repairs, but also uses the means of the present invention to greatly increase output power. It became possible to increase.

(Embodiment 9) In this embodiment, an example of a method for repairing a solar cell array will be described. The solar cell module in this example is a replaceable module.

Since two modules of the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 28, when replacing a new solar cell module, it is not necessary to simply replace it with a new E type module. By using the means of the present invention, an H-type module having the same external dimensions and higher power generation efficiency, a large current rating and a large output power, and an F-type module having a size suitable for the surplus space 701 are exchanged and repaired. Fix, E type module 6
And a string in which one H-type module is connected in series, and one H-type module and four E-type modules
And a string in which two F-type modules were connected in series, and they were connected in parallel to form a solar cell array 12. The voltage of each solar cell string falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.

Using the above rated values, similar to the first embodiment,
As a result of simulating the array output of the solar cell array 12 under certain solar radiation and temperature conditions, Pmax is 8.
6259W, the IV mismatch loss is 1.328%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 12 using the means of the present invention increased by 1.1753 W (about 16%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, the module is replaced with an H-type module having the same outer dimensions as the E-type module, a higher current rating, and a larger output power. By adding an F-type module that has a small current rating but fits the surplus space, and connecting each solar cell module in series / parallel to form the solar cell array 12, the previous solar cell array 5 having only the E-type module can be used. Compared with this, the output power can be greatly increased. Also,
By using the replaceable solar cell module, not only is it possible to easily perform replacement and additional arrangement and repair as described above, but also by using the means of the present invention together,
The output power can also be greatly increased.

Embodiment 10 Since two modules of the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 29, when replacing with a new solar cell module,
Rather than simply replacing with a new E-type module,
Using the means of the present invention, an H-type module having the same external dimensions and higher power generation efficiency, a large current rating and a large output power, and a size suitable for the surplus space 701
Replaced and repaired the type module, re-arranged it, configured two strings in which five E-type modules, one H-type module, and one F-type module were connected in series, connected them in parallel, and assembled the solar cell array 13. Configured.
The voltage of each solar cell string falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.

Using the above rated values, as in the first embodiment,
As a result of simulating the array output of the solar cell array 13 under certain solar radiation and temperature conditions, Pmax was 8.
5945W, the IV mismatch loss is 1.688%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 13 using the means of the present invention increased by 1.1439 W (about 15%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, it is replaced with an H-type module having the same external dimensions as the E-type module, a higher current rating, and a larger output power. By adding an F-type module that has a small current rating but fits the surplus space, and connecting the respective solar cell modules in series / parallel to form a solar cell array 13, the solar cell array 5 having only the previous E-type module can be used. Compared with this, the output power can be greatly increased. Also,
By using the replaceable solar cell module, not only is it possible to easily perform replacement and additional arrangement and repair as described above, but also by using the means of the present invention together,
The output power can also be greatly increased.

(Embodiment 11) As shown in FIG. 30, using the means of the present invention, not only an E-type module but also an F-type module having a different current rating and module area on the same installation surface as in the third embodiment. A string in which six E-type modules were connected in series and a string in which eight F-type modules were connected in series were used, and the two strings were connected in parallel to form a solar cell array 14. Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

As a result, a surplus space 701 having a length of 40 mm has been generated in the conventional method, but can be reduced to a surplus space 702 having a length of 30 mm.

Using the above rated values, as in the first embodiment,
As a result of simulating the array output of the solar cell array 14 under certain solar radiation and temperature conditions, Pmax was 7.
6280 W, the IV mismatch loss is 6.927%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 14 using the means of the present invention is 0.1774 W (about 2.4%).
Also increased. Also, there is only one power peak.

That is, in the conventional method, there was a surplus space in which the solar cell module could not be installed even though there was an installable area, but the F type having a different current rating, cell area, cell electrical characteristics, and module area from the E type module. Solar cell array 1 in which type modules are connected in series
By constructing No. 4, the surplus space can be reduced, and further, the overall output can be greatly increased.

(Embodiment 12) As shown in FIG. 25, using the means of the present invention, not only E-type modules but also F-type modules having different current ratings and module areas are used on the same installation surface as in Example 3. Two strings composed of three E-type modules and four F-type modules connected in series were used, and the two strings were connected in parallel to form a solar cell array 15. Note that the voltage of each solar cell string falls within the input voltage range of the inverter. In addition, a bypass diode is arranged in each solar cell module.

As a result, a surplus space 701 having a length of 40 mm has been generated in the conventional method, but can be reduced to a surplus space 702 having a length of 30 mm.

Using the above rated values, similar to the first embodiment,
As a result of simulating the array output of the solar cell array 15 under certain solar radiation and temperature conditions, Pmax is 8.
1138 W, the IV mismatch loss is 1.000%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 15 using the means of the present invention increased by 0.6632 W (about 9%). Also, there is only one power peak.

That is, in the conventional method, there is a surplus space in which the solar cell module cannot be installed even though there is an installable area, but the F type is different from the E type module in the current rating, cell area, cell electric characteristics, and module area. By configuring the solar cell array 15 in which the type modules are connected in series / parallel, the excess space can be reduced, and the overall output can be greatly increased.

(Embodiment 13) In this embodiment, an example of a method for repairing a solar cell array will be described. The solar cell module in this example is a replaceable module.

Since one of the modules in the solar cell array 5 shown in FIG. 21 has failed, as shown in FIG. 32, when replacing a new solar cell module, it is not necessary to simply replace it with a new E type module. A string in which six E-type modules are replaced and repaired and replaced with an H-type module having the same outer dimensions and higher power generation efficiency, a higher current rating and a higher output power using the means of the present invention, Two strings of one H-type module and five E-type modules connected in series were connected in parallel to form a solar cell array 16. The voltage of each solar cell string falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.

Using the above rated values, similar to the first embodiment,
As a result of simulating the output of the solar cell array 16 under certain solar radiation and temperature conditions, Pmax was 7.
5257W, the IV mismatch loss is 0.648%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 16 using the means of the present invention increased by 0.0751 W (about 1%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, it is replaced with an H type module having the same outer dimensions as the E type module, a higher current rating, and a larger output power. Solar cell array 1
With the configuration 6, the output power can be increased as compared with the previous solar cell array 5 including only the E type module. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement as described above and enables repairs, but also uses the means of the present invention to greatly increase output power. It became possible to increase.

(Embodiment 14) In this embodiment, an example of a method for repairing a solar cell array will be described. The solar cell module in this example is a replaceable module.

Since one of the modules in the solar cell array 5 shown in FIG. 21 has failed, as shown in FIG. 33, when replacing a new solar cell module, it is not necessary to simply replace it with a new E type module. A string in which six E-type modules are replaced and repaired and replaced with an H-type module having the same outer dimensions and higher power generation efficiency, a higher current rating and a higher output power using the means of the present invention, A string in which five E-type modules and one H-type module were connected in series was connected in parallel to form a solar cell array 17. The voltage of each solar cell string is within the input voltage range of the inverter,
Each solar cell module is provided with a bypass diode.

Using the above rated values, as in the first embodiment,
As a result of simulating the array output of the solar cell array 17 under certain solar radiation and temperature conditions, Pmax was 7.
5257W, the IV mismatch loss is 0.648%, and the conventional solar cell array 5 (maximum output power (Pmax) 7.
4506 W), the output power of the solar cell array 17 using the means of the present invention increased by 0.0751 W (about 1%). Also, there is only one power peak.

As described above, by using the means according to the present invention, even when the solar cell module breaks down, it is replaced with an H-type module having the same outer dimensions as the E-type module, a higher current rating, and a larger output power. Solar cell modules connected in series to form a solar cell array 17
With this configuration, the output power can be increased as compared with the previous solar cell array 5 including only the E type module. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement as described above and enables repairs, but also uses the means of the present invention to greatly increase output power. It became possible to increase.

Although the above-described embodiments are only examples of preferred embodiments of the present invention, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0140]

As described above, the solar cell array forming method of the present invention has the following effects.

By using a solar cell array including at least one solar cell module having a different current rating, a solar cell array including a solar cell string in which solar cell modules having different cell areas and module areas are connected in series can be assembled. The degree of freedom in design is extremely high. As a result, in the past, there were many places where solar cell modules could not be installed in the installable area, but it was possible to spread the solar cells without waste as much as possible, and as much as possible in the limited space of the installable area The output of the solar cell array can be increased.

Further, an array configuration in which the power peak of the current-power characteristics of the entire solar cell array is one, and the amount of current deviation between each solar cell string and the solar cell array is reduced, thereby minimizing output loss. And an efficient output can be obtained.

In addition, by using the replaceable solar cell module, even if a part of the solar cell module should be broken, it can be easily replaced, and by using the means of the present invention, the solar cell array can be easily replaced. Repair and replacement can be performed by performing replacement arrangement or additional arrangement on the most suitable solar cell module, and the output power can be greatly increased. As a matter of course, not only in the case of failure, but also replacing / additional arrangement of a part of the existing solar cell array with the optimum solar cell module using the means of the present invention to increase the output. Is also possible.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a general house having a roof on which a solar cell array is installed.

FIG. 2 is a conceptual diagram of a roof south surface on which a conventional solar cell array is arranged.

FIG. 3 is a conceptual diagram of a roof south surface on which a solar cell array of the present invention is arranged.

FIG. 4 is a graph showing output characteristics of the solar cell array of FIG. 3 and each solar cell string constituting the solar cell array.

FIG. 5 is a conceptual diagram of a solar cell module constituting the solar cell array of FIGS. 2 and 3.

FIG. 6 is a graph showing current (I) -voltage (V) characteristics of a solar cell.

FIG. 7 is a graph showing voltage (V) -power (P) characteristics of a solar cell.

FIG. 8 is a layout view of a roof on which a solar cell array according to the present invention is installed.

9 is a graph showing output characteristics of the solar cell array of FIG. 8 and each solar cell string constituting the solar cell array.

FIG. 10 is a layout view of a roof on which a solar cell array according to the present invention is installed.

11 is a graph showing output characteristics of the solar cell array of FIG. 10 and each solar cell string constituting the solar cell array.

FIG. 12 is a layout view of a roof on which a conventional solar cell array is installed.

FIG. 13 is a layout view of a roof on which a solar cell array according to the present invention is installed.

FIG. 14 is a configuration diagram of a solar cell power generation system of the present invention.

FIG. 15 is a schematic perspective view of a general house having a roof on which a solar cell array is installed.

FIG. 16 is a conceptual diagram of a roof south surface on which a conventional solar cell array is arranged.

FIG. 17 is a conceptual diagram of a roof south surface on which the solar cell array of the present invention is arranged.

18 is a graph showing output characteristics of the solar cell array of FIG. 17 and each solar cell string constituting the solar cell array.

FIG. 19 is a conceptual diagram of a solar cell module constituting the solar cell array of FIGS. 16 and 17.

FIG. 20 is a conceptual diagram of an installation surface and a solar cell module used in Examples 3 to 14.

FIG. 21 is a roof layout diagram in which a conventional solar cell array is installed.

FIG. 22 is a layout diagram of a roof on which the solar cell array according to the third embodiment is installed.

FIG. 23 is a layout view of a roof on which the solar cell array according to the fourth embodiment is installed.

FIG. 24 is a layout view of a roof on which the solar cell array according to the fifth embodiment is installed.

FIG. 25 is a layout view of a roof on which the solar cell array according to the sixth embodiment is installed.

FIG. 26 is a layout view of a roof on which the solar cell array according to the seventh embodiment is installed.

FIG. 27 is a layout view of a roof on which a solar cell array according to an eighth embodiment is installed.

FIG. 28 is a layout view of a roof on which the solar cell array according to the ninth embodiment is installed.

FIG. 29 is a layout view of a roof on which the solar cell array according to the tenth embodiment is installed.

FIG. 30 is a layout view of a roof on which the solar cell array according to the eleventh embodiment is installed.

FIG. 31 is a layout view of a roof on which the solar cell array according to the twelfth embodiment is installed.

FIG. 32 is a layout view of a roof on which the solar cell array according to the thirteenth embodiment is installed.

FIG. 33 is a layout view of a roof on which the solar cell array of Example 14 is installed.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hidehisa Makita 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Makoto Sasaoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Co., Ltd. F-term (reference) 5F051 BA03 BA12 JA06 JA07

Claims (17)

[Claims] 1. A solar cell array in which a plurality of solar cell strings electrically connected to a plurality of solar cell modules are connected in parallel, wherein the solar cell array includes at least one solar cell module having a different current rating. Solar array. 2. The solar cell array according to claim 1, comprising at least one solar cell string in which at least one solar cell module having a different current rating is electrically connected. 3. The solar cell according to claim 2, wherein each solar cell string comprises at least two types of solar cell modules having different current ratings, and each solar cell string has the same electrical characteristics. array. 4. The solar cell string according to claim 1, wherein each of the solar cell strings comprises a solar cell module having the same current rating.
The solar cell array as described in the above. 5. The voltage-power characteristic of the solar cell array has one power peak.
The solar cell array as described in the above. 6. The solar cell array according to claim 1, wherein the solar cell modules having different current ratings are solar cell modules having different solar cell areas. 7. The solar cell array according to claim 1, wherein said solar cell modules having different current ratings are solar cell modules having different solar cell electric characteristics. 8. The solar cell array according to claim 1, wherein the solar cell modules having different current ratings are solar cell modules having different solar cell module areas. 9. The solar cell array according to claim 1, wherein said solar cell module is an amorphous silicon solar cell module. 10. The solar cell array according to claim 1, wherein a bypass diode is arranged in each solar cell of the solar cell module. 11. The solar cell module according to claim 1, wherein the solar cell module is a building material-integrated solar cell module.
11. The solar cell array according to 10. 12. The solar cell module according to claim 1, wherein the solar cell module is a replaceable solar cell module.
12. The solar cell array according to 11. 13. The solar cell array according to claim 1, which is installed on a roof surface. 14. A solar cell array according to claim 1, wherein the solar cell module is replaced with a solar cell module having the same or substantially the same outer dimensions, shape, and appearance, and having higher power generation efficiency and higher output power. Repair method of solar cell array. 15. A solar cell power generation system, wherein the output power of the solar cell array according to claim 1 is supplied to a load via a power conversion means. 16. The solar cell power generation system according to claim 15, wherein a backflow preventing blocking diode is disposed between each solar cell string and the power converter. 17. The solar cell power generation system according to claim 15, wherein a maximum power follower is mounted on the power converter.