JP3604948B2 - Solar cell array, repair method thereof, and solar cell power generation system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a solar cell array and a solar cell power generation system using the solar cell array.
[0002]
[Prior 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 produce harmful by-products such as thermal power and nuclear power. . 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.
[0003]
When constructing a photovoltaic power generation system, a photovoltaic string is configured by electrically connecting the photovoltaic modules so that a desired voltage is obtained according to the characteristics of the photovoltaic module, and a desired output capacity is obtained. The solar cell strings are connected in parallel so as to form a solar cell array.
[0004]
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, the number of series solar cell modules and the number of parallel solar cell strings were determined so as to obtain a desired capacity, and a solar cell array was configured.
[0005]
[Problems to be solved by the invention]
By the way, taking into account the current housing situation in Japan, the solar cell installation area where the power generation capacity to sell electricity generated by solar cells through grid interconnection can be expected to be larger than the power capacity to be purchased is estimated. We have to say that we have very few homes. For this reason, we want to install solar cells in the roof space where solar cell arrays are installed, but there are restrictions due to the shape and size of the solar cell module, restrictions due to solar cell characteristics, and restrictions due to inverter input voltage. 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 a 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 circuit voltage of 2 V and a short circuit current of 5 A shown in FIG.
[0007]
Consider a case in which a vertically-stacked A-type solar cell module is installed on the roof as shown in FIG.
[0008]
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 must be selected from multiples of 15, 16, 17, 18, 19, and 20. Thus, the maximum number of solar cell modules that can be installed is 16 solar cell strings × 3 parallel = 48 solar cell strings.
[0009]
However, the solar cell installation area of this roof is 8.4m wide x 6m long = 50.4m ² However, since the outer size of the A type module is 500 mm × 2 m, it can be justified by arranging three pieces in the vertical direction, but it becomes 0.5 m × 16 = 8 m in the horizontal direction, which is 0.4 m more. Occurs.
[0010]
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.
[0011]
Usually, in these extra spaces, a dummy module having the same shape as the solar cell module but not using solar cells, or a general roofing material such as metal of the same shape is installed. The above differences tend to occur, which is not preferable in the design of the roof, and there is a problem that the amount of power generation cannot be sufficiently used in a limited space in order to waste space for installing the solar cell module.
[0012]
An object of the present invention is to arrange 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 solar cell module installable area, Another object of the present invention is to provide a method for configuring a solar cell array having a high degree of freedom in design, which enables a preferable configuration in terms of design.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have at least one solar cell string, Solar cell area and Two types of solar cell modules with different current ratings Are connected in series. In addition, the voltage-power characteristic of the solar cell array constitutes a solar cell array having only one power peak, and the output power of the solar cell array is supplied to a load via a power conversion unit equipped with a maximum power follower. By using a solar cell power generation system that supplies solar cells, it has been discovered that the amount of power generation as a whole can be improved in a solar cell array installed on a limited installation surface.
[0014]
According to the present invention, for example, as shown in FIG. 2, up to 48 solar cell modules can be installed in a vertical roofing type A solar cell module until now. As shown in FIG. 3, in addition to the 48 conventional A-type modules, a narrow B-type module (FIG. 5) can be installed in a surplus space.
[0015]
As described above, although the same vertical type modules of the A type and the B type are used, by connecting the solar cell modules having different current ratings, cell areas, and module areas in series, unnecessary surplus space is provided on the surface where the solar cell modules can be installed. The solar cell module can be installed on the entire roof surface, so that the degree of freedom in design is greatly increased, the design and appearance are extremely excellent, and the output is increased.
[0016]
In addition, by using a building material integrated solar cell module, it is possible to install a solar cell array that can be installed in a larger area and emphasize the design, and it is possible to design a solar cell array with excellent appearance, Since the solar cell module can be directly installed without having to install it in advance, the workability is very excellent.
[0017]
Furthermore, from the viewpoint of sunlight reception, more solar radiation can be obtained by installing on the roof surface. In addition, since it is possible to design a solar cell array having an excellent design, a roof having a very high design can be obtained.
[0018]
Also, the output of the solar cell array fluctuates considerably depending on the amount of solar radiation, temperature, etc., and the operating point voltage and operating point current of the solar cell array are changed. The maximum power tracking control that tracks the operating point near the maximum power or the maximum power, that is, the maximum power tracking device that performs the so-called MPPT control is a photovoltaic power generation system mounted in the power conversion device, so that the maximum output of the solar cell array is always maintained. Can be obtained.
[0019]
The present invention is based on the following findings obtained from the study of the present inventors.
[0020]
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, at which point in the IV line the device operates is determined by 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.
[0021]
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 indicated by oblique lines in FIG. It is represented by the square area shown by.
[0022]
When the power value corresponding to each point of the curve is represented as a voltage function, it is as shown in FIG. 7, 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 called the optimum operation current (Imp) and the optimum operation voltage (Vmp), respectively.
[0023]
Generally, various characteristic values regarding these IV characteristics are AM1.5, 100 mV / cm. ² , 25 ° C.
[0024]
Here, when a solar cell array is configured by combining solar cell strings having different solar cell characteristics, a reduction in output due to inability to match IV curves, a so-called “IV mismatch loss” occurs. Therefore, in the case of configuring a solar cell array, 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.
[0025]
However, when a solar cell array is configured 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 It is located between the optimal operating voltages of the strings. Therefore, the amount of voltage deviation from the optimal operating voltage of the solar cell array viewed from the optimal operating 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.
[0026]
In particular, when the deviation of the optimum operating voltage of each solar cell string is small, the voltage (V) -power (P) characteristic curve of the solar cell array 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.
[0027]
Furthermore, by providing a system for supplying power to a load via a power converter equipped with a maximum power tracking device, a maximum output can be always obtained as a solar cell array.
[0028]
For example, as shown in FIG. 8, a solar cell array using a standard solar cell module having an open-circuit voltage of 1 V and a short-circuit current of 1 A is provided with a solar cell having a low open-circuit voltage of 1 V and a short-circuit current of 0.5 A. Consider a solar cell array incorporating a module.
[0029]
First, a solar cell string I in which five 1 V and 1 A solar cell modules and two 1 V and 0.5 A solar cell modules are connected in series, and a solar cell string in which seven 1 V and 1 A solar cell modules are connected in series In the case of the solar cell array (a) in which IIs are connected in parallel, the voltage (V) -power (P) characteristics of the entire solar cell array (a) are as shown in FIG.
[0030]
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 as large as 1.9145 V. Further, since the optimum operating voltage of the solar cell array (a) is 5.3900 V, the “voltage deviation amount” between the solar cell array (a) and the respective optimum operating voltages of the solar cell strings I and II is: Each of the solar cell arrays is 2.1181 V and 3.4755 V, and has a very large “voltage shift” between the solar cell array (a) and each string. Note that the maximum power is 6.9106W.
[0031]
At this time, the IV mismatch loss is as large as 14.383%, resulting in a solar cell array configuration with very low efficiency.
[0032]
As another example, a solar cell string III in which five standard solar cell modules with Voc = 1V and Isc = 1A are connected to two modules and two solar cell modules with small current ratings of Voc = 1V and Isc = 0.9A are connected in series. In the case of the solar cell array (b) in which solar cell strings IV in which seven solar cell modules of 1 V and 1 A are connected in series are connected in parallel, the voltage-power characteristics of the entire solar cell array (b) are as shown in FIG. Become.
[0033]
At this time, the optimal operating voltage of the solar cell string III is 5.2344 V, and the optimal operating voltage of the solar cell string IV is 5.1864 V. Therefore, the voltage deviation between the solar cell strings is suppressed to a very small value of 0.048 V. ing. Further, since the optimum operating voltage of the solar cell array (b) is 5.2220 V, the “voltage deviation amount” between the solar cell array (b) and the optimum operating voltages of the solar cell strings III and IV is 0 each. 0.0124V and 0.0356V. The maximum power is 8.5224W.
[0034]
At this time, the IV mismatch loss is suppressed to a very small value of 0.535%, which indicates that the array configuration is very efficient.
[0035]
Comparing the above two examples, the solar cell array (b) has a much smaller “voltage shift amount”, a very small IV mismatch loss, and a very high efficiency compared to the solar cell array (a). It can be seen that this is a good solar cell array configuration.
[0036]
In this way, by configuring the solar cell array within the range where the power peak is one, it is possible to remove the difference in the current rating of the installed solar cell module from the restrictions of the array configuration, and the cell area and module area Solar cells can be installed in different designs. 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.
[0037]
Further, 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 the IP characteristic curve near the optimum operating point is gentle, and in particular, power reduction is suppressed, and Are suitable.
[0038]
Furthermore, since the solar cell modules having different current ratings can be installed on the same solar cell array, the solar cell can be installed on the installation surface as much as possible without generating extra space on the installation surface of the solar cell array. In the case of a building material-integrated solar cell such as a roofing material-integrated solar cell, a solar cell module can be installed on the entire surface on which the solar cell can be installed, which is particularly preferable.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the solar cell array of the present invention and a solar power generation system using the solar cell array will be described. Note that the present invention is not limited to this example.
[0040]
An example of the solar cell array configuration of the present invention will be described with reference to FIGS.
[0041]
FIG. 12 is a top view in which the solar cell array 5-1 is installed on the roof surface of a certain house (solar cell installation area length 6 m × width 7 m). In the crystalline solar cell module (i) with an aluminum frame of 2 m × 2 m used here, there is an area where 12 sheets can be installed, but an extra space 501 of 6 m × 1 m is generated.
[0042]
According to the present invention, as shown in FIG. 13, by installing three crystalline solar cell modules (ii) with an aluminum frame of 2 m length × 1 m width different in module area in the surplus space 501, a total of 15 solar cells 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.
[0043]
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. The solar cell module can be installed in the entire area where the module can be installed.
[0044]
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-described solar cell array 5-2 as an example.
[0045]
The solar cell module is electrically connected to obtain a desired voltage to form a solar cell string, 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.
[0046]
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 difference in characteristics of each string, and further, a maximum power follower. The maximum power of the solar cell array 5-2 is always supplied to the load 507 via the power conversion device 506 equipped with. The load 507 includes an electric heat load, a motor load, a commercial AC system, and a combination thereof.
[0047]
(Solar cells)
The solar cell used in the solar cell array of the present invention is not particularly limited, and a silicon semiconductor can be a single crystal silicon semiconductor, a polycrystalline silicon semiconductor, a microcrystalline silicon semiconductor, an amorphous silicon semiconductor, or the like. A group III-V compound semiconductor, a group II-VI compound semiconductor, a group I-III-VI compound semiconductor, or the like can be used.
[0048]
(Solar cell module)
There is no particular limitation on the form of the solar cell module of the present invention, and there are various forms such as a building material integrated type such as a tiled roof type and a horizontal type, a replaceable type, a detachable type, and a conventional type with an aluminum frame. .
[0049]
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, and It has the function of. 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.
[0050]
In addition, the detachable and replaceable solar cell module is a type in which a failure occurs after the array is installed once, the failed solar cell module is removed, and it can be easily replaced with a new solar cell module, It is excellent in maintenance because it can be replaced one by one.
[0051]
(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 / parallel in order to obtain a desired voltage / current value.
[0052]
(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.
[0053]
In general, a solar cell module may be simply called a module, a solar cell string may be simply called a string, and a solar cell array may be simply called an array.
[0054]
(Bypass diode)
Assuming a partial shade for the solar cell module, when a certain solar cell or solar cell module is shaded and the current drops extremely below the current of other solar cells or solar cell modules, the solar cell To prevent reverse bias, a bypass diode is provided in the solar cell.
[0055]
As the type of the bypass diode of the present invention, a cuprous oxide rectifier, a selenium rectifier, a point contact diode, a bond type diode, an alloy (alloy) type junction diode, a diffusion type junction diode, a growth type junction diode, etc. can be applied without limitation. is there.
[0056]
(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 reverse flow 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 solar cell string in a connection box.
[0057]
As the kind of the blocking diode of the present invention, a cuprous oxide rectifier, a selenium rectifier, a point contact diode, a bond type diode, an alloy (alloy) type junction diode, a diffusion type junction diode, a growth type junction diode and the like can be applied without limitation. is there.
[0058]
(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 (including eaves, ridges, kerabas, etc., including each part of the roof) including base materials, shingles, tiles, etc., outer walls, verandas, balconies, balconies, carports, soundproof walls, solar cell stand, etc. And all places where the solar cell module can be installed, and from the viewpoint of effective use of sunlight, a roof surface is particularly preferred.
[0059]
(Power converter)
The power converter is not particularly limited, and includes a DC / DC converter using a self-extinguishing type switching device such as a power transistor, a power MOSFET, an IGBT, and a GTO, and a self-excited DC / AC inverter. This power converter can control power flow, input / output voltage, output frequency, and the like by controlling ON / OFF of a gate path.
[0060]
(Maximum power tracking device)
In the solar cell array, the power generation amount of 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 depending on 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. Further, following the maximum power is called MPPT control, and the device is also called an MPPT control device.
[0061]
(Junction box)
This is a device that collects the current of each solar cell string and supplies it to the power converter.
[0062]
【Example】
Hereinafter, embodiments of the solar cell array of the present invention and a solar power generation system using the solar cell array will be described. Note that the present invention is not limited to this example.
[0063]
(Example 1)
1 shows an example of a solar cell array configuration and output characteristics of the array of the present invention.
[0064]
FIG. 1 is a perspective conceptual view of a general house provided with a roof on which a solar cell array of the present invention is installed, FIG. 2 is a conceptual view of the roof south side on which a solar cell array 1 is arranged by a conventional installation method, and FIG. FIG. 4 is a conceptual diagram of the southern surface of the roof where the solar cell array 2 installed by 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. 5 shows a conceptual diagram of a solar cell module constituting the solar cell array of FIGS. 2 and 3.
[0065]
The roof south side shown in Fig. 1 is 6m long x 8.4m wide = 50.4m ² Of the solar cell module can be installed.
[0066]
Here, a solar cell array configuration based on the conventional installation method shown in FIG. 2 will be considered.
[0067]
In the case of installing a vertically-floating amorphous silicon solar cell module A type with a working width of 500 mm x a length of 2 m (rated output: 60 W) on the south side of the roof, a total of 48 can be installed, 3 rows vertically and 16 rows horizontally. is there. When the input voltage range of the inverter to be used is 250 to 350 V, considering the voltage of the solar cell module, 48 modules can be installed in “A type module 16 series × 3 parallel”, 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.
[0068]
Next, as shown in FIG. 3, using the means of the present invention, not only the A-type module but also the B-type module having different current ratings, cell areas and module areas (working width 400 mm × length 2 m, rated output 54 W) Are arranged in the surplus space 101. In this way, three B type modules can be additionally installed in addition to the 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.
[0069]
Now, 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% with respect to 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 A, respectively. The rated value of the open-circuit voltage (Voc) is 20 V in each case. Using these rated values, a simulation of the array output actually installed under certain solar radiation and temperature conditions is performed.
[0070]
First, a simulation is performed for 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 parallel is 2980 W.
[0071]
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.
[0072]
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. Is voltage, the vertical axis is power on the left side, and the current is on the right side. In the figure, (b) shows a string of “A type module 16 series + B type module 1 series”, and (a) shows a (V)-(P) characteristic of the solar cell array 2 in which the strings are connected in three parallel. . In the figure, (d) is a string of "A type module 16 series + B type module 1 series", and (c) is a (V)-(I) characteristic of the solar cell array 2 in which the strings are connected in three parallel. It is.
[0073]
The optimum operating voltages (Vmp) of (a) and (b) 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. At this time, the total output of the entire solar cell array 2 is 314.5 W.
[0074]
Therefore, a conventional solar cell array 1 composed of only A-type modules and a B-type module having different current rating, cell area, cell electrical characteristics, and module area are arranged in a surplus space and connected in series with the A-type module. Comparing the solar cell array 2 according to the present invention, the output of the solar cell array 2 increased by 155 W as compared with the solar cell array 1.
[0075]
That is, although the conventional method has a surplus space in which the solar cell module cannot be installed even though there is an installable area, a solar module in which a B type module having a different current rating, cell area, and module area is connected in series with the A type module is provided. It can be seen that by configuring the battery string, the solar cell module can be installed in the surplus space, and the overall output has greatly increased.
[0076]
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 easily flows to some of the solar cell modules in the same solar cell string. . However, by arranging the bypass diode in each of the solar cell modules, it was possible to prevent a reverse bias from flowing. Similarly, when the voltage of each solar cell string falls into an extremely different state, a reverse current tends to flow. However, the blocking current is prevented by arranging a blocking diode in each solar cell string as shown in FIG. I was able to do it.
[0077]
The solar cell array 2 thus configured can arrange a solar cell string in which solar cell modules having different current ratings, cell areas, and module areas are connected in series, and an area where the solar cell modules can be installed. And the solar cell output capacity 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.
[0078]
(Example 2)
5 shows another example of the solar cell array configuration and the output characteristics of the array of the present invention.
[0079]
FIG. 15 is a schematic perspective view of a general house having a roof on which the solar cell array of the present invention is installed, FIG. 16 is a conceptual diagram of the southern surface of the roof on which the solar cell array 3 is arranged by a conventional installation method, and FIG. FIG. 18 is a conceptual view of the southern surface of the roof where the solar cell array 4 installed by using the means according to the present invention is arranged. FIG. 18 is a graph showing the output characteristics of the solar cell array 4 of FIG. 19 shows a conceptual diagram of a solar cell module constituting the solar cell array of FIGS. 16 and 17.
[0080]
The roof south surface shown in FIG. 15 is 5.55 m long × 8 m wide = 44.4 m. ² Solar cell module installation area.
[0081]
Here, a solar cell array configuration based on the conventional installation method shown in FIG. 16 is considered.
[0082]
When installing a roof type amorphous silicon solar cell module D type with a working width of 400 mm x a length of 2.5 m (rated output: 60 W) on the south side of the roof, a total of 39 sheets, 13 rows vertically and 3 rows, are installed. It is possible. When the input voltage range of the inverter to be used is 250 to 350 V, in consideration of the voltage of the solar cell module, 39 D-type modules 13 series × 3 parallel can be installed, and a rated output of 2340 W can be obtained. However, in this case, a surplus space 601 in which the solar cell module cannot be installed occurs.
[0083]
Next, as shown in FIG. 17, using the means of the present invention, not only D-type modules but also C-type modules having different current ratings, cell areas and module areas (working width 320 mm × length 2.5 m, rated output 54 W ) Is arranged in the surplus space 601. As described above, 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 14 series × 2 parallel” and “(D-type module 11 series + C-type module 3 series) × 1 parallel” Thus, 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.
[0084]
Now, the C type module is a horizontal roofing type module having the same shape as the D type module, but the cell area is 90% and the module area is 80% with respect to 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. The rated value of the open-circuit voltage (Voc) is 20 V in each case. Using these rated values, a simulation of the array output actually installed under certain solar radiation and temperature conditions is performed.
[0085]
First, a simulation is performed on 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 this string is arranged in three rows is 2421.4 W.
[0086]
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.
[0087]
FIG. 18 shows a voltage (V) -power (P) characteristic and a voltage (V) -current (I) characteristic of the solar cell array 4 shown in FIG. Is voltage, the vertical axis is power on the left side, and the current is on the right side. In the figure, (b) is a string of "D type module 14 series", (c) is a string of "(D type module 11 series + C type module 3 series)", and (a) is a string of the three strings. It is a (V)-(P) characteristic of the whole solar cell array 4 connected. 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.
[0088]
The optimal operating voltage (Vmp) in (a) is 208.32 V, and is located between Vmp = 207.46 V in (b) and 209.56 V in (c). The "voltage shift amounts" are very small, 0.86 V and 1.24 V, respectively. 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.
[0089]
Therefore, the solar cell array 3 according to the present invention in which the conventional solar cell array 3 composed of only the D type modules and the C type modules having different current ratings, cell areas, and module areas are arranged in a surplus space and connected in series with the D type modules. 4, the output of the solar cell array 4 increased by 159.3 W as compared with the solar cell array 3.
[0090]
That is, although there is an extra space in which the solar cell module cannot be installed in the conventional method while there is an installable area, the C type module differs from the D type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. It can be seen that, by configuring the solar cell string in which the solar cell modules are connected in series, the solar cell module can be installed in the surplus space, and the overall output is greatly increased.
[0091]
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 easily flows to some of the solar cell modules in the same solar cell string. . However, by arranging the bypass diode in each of the solar cell modules, it was possible to prevent a reverse bias from flowing. Similarly, when the voltage of each solar cell string falls into an extremely different state, a reverse current tends to flow. However, the blocking current is prevented by arranging a blocking diode in each solar cell string as shown in FIG. I was able to do it.
[0092]
The solar cell array 4 configured in this manner can arrange a solar cell string in which solar cell modules having different current ratings, cell areas, and module areas are connected in series, and an area where the solar cell modules can be installed. And the solar cell output capacity 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.
[0093]
( Comparison Example 3)
An example of the configuration of the solar cell array of the present invention and the output characteristics of the array will be described below using a simplified model.
[0094]
As shown in FIG. 20, the installation surface used in this embodiment uses a model roof whose installation surface is 400 mm wide × 340 mm long. Also, the modules used are the E-type module and the F-type module shown in FIG.
[0095]
The solar cell array 5 shown in FIG. 21 is an arrangement diagram in which only the E-type module (outside dimensions: 200 mm in width × 50 mm in length, open voltage: 1 V, short-circuit current: 1 A) is installed by a conventional installation method. In this case, a surplus space 701 where the solar cell module cannot be installed occurs.
[0096]
Next, as shown in FIG. 22, using the means of the present invention, not only an E type module but also an F type module having different current rating and module area (outer size: 200 mm wide × 40 mm long, open voltage: 1 V, short circuit (Current: 0.9 A) is placed in the surplus space 701, one F-type module and one E-type module are connected in parallel, and they are connected in series. Further, a string connected in series with four E-type modules is formed. In addition, a string is formed by connecting six E-type modules in series, and the solar cell array 6 is formed by connecting these two strings in parallel. Thus, the extra space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating the extra space. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0097]
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 using the above rated values as in the first embodiment, the maximum output power of the solar cell array 5 ( Pmax) is 7.4506 W, the Pmax of the solar cell array 6 is 7.7593 W, and the IV mismatch loss is 9.4%. Compared with the conventional solar cell array 5, the solar cell array 6 using the means of the present invention has the following advantages. The output power increased by 0.3087 W (about 4%). Also, there was only one power peak.
[0098]
That is, although there is an extra space where the solar cell module cannot be installed in the conventional method even though there is an installable area, the F type module differs from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. Are arranged in series and in parallel, so that the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.
[0099]
( Comparison Example 4)
As shown in FIG. 23, using the means of the present invention, not only the E-type modules but also the F-type modules having different current ratings and module areas are arranged in the surplus space 701 on the same installation surface as in the third embodiment. One type module and one E type module are connected in parallel, and two strings are formed by connecting them in series with five E type modules. The solar cell array 7 is configured by connecting these two strings in parallel. Thus, the extra space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating the extra space. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0100]
As a result of simulating the array output of the solar cell array 7 under a certain solar radiation and temperature condition using the above-described rated values in the same manner as in Example 1, the Pmax was 7.7427 W, and the IV mismatch loss was 8.305%. As compared with the conventional solar cell array 5 (maximum output power (Pmax) 7.4506 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.
[0101]
That is, although there is an extra space where the solar cell module cannot be installed in the conventional method even though there is an installable area, the F type module differs from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. Are arranged in series and in parallel, so that the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.
[0102]
(Example 5)
As shown in FIG. 24, using the means of the present invention, not only the E-type module but also a G-type module having different current rating and module area (outer size: 200 mm in width × 90 mm in height) on the same installation surface as in Example 3. , 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 Make up the two. A solar cell array 8 as shown in FIG. 24 is configured by connecting these two strings in parallel. Thus, the extra space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating the extra space. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0103]
As a result of simulating the output of the solar cell array 8 under certain solar radiation and temperature conditions using the above rated values in the same manner as in Example 1, the Pmax was 7.7488 W, and the IV mismatch loss was 8.233%. As compared with the conventional solar cell array 5 (maximum output power (Pmax) 7.4506 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.
[0104]
That is, although the conventional method has an installable area, there is a surplus space where the solar cell module cannot be installed, but the G type module differs from the E type module in current rating, cell area, cell electrical characteristics, and module area. Are connected in series, the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.
[0105]
(Example 6)
As shown in FIG. 25, using the means of the present invention, not only the E-type modules but also the G-type modules having different current ratings and module areas are arranged in the surplus space 701 on the same installation surface as in the third embodiment. Two strings in which one type module and five E-type modules are connected in series are formed, and the solar cell array 9 is formed by connecting these two strings in parallel. Thus, the extra space 701 is generated in the conventional method shown in FIG. 21, but the solar cell can be installed without generating the extra space. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0106]
As a result of simulating the array output of the solar cell array 9 under certain solar radiation and temperature conditions using the above rated values in the same manner as in Example 1, Pmax was 7.7427 W, and IV mismatch loss was 8.305%. As compared with the conventional solar cell array 5 (maximum output power (Pmax) 7.4506 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.
[0107]
That is, although the conventional method has an installable area, there is a surplus space where the solar cell module cannot be installed, but the G type module differs from the E type module in current rating, cell area, cell electrical characteristics, and module area. Are connected in series, so that the solar cell module can be installed in the surplus space, and the overall output can be greatly increased.
[0108]
( Comparison Example 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.
[0109]
Since two modules of the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 26, when replacing with a new solar cell module, the present invention is not simply replaced with a new E-type module. H type module (external size: 200 mm wide x 50 mm long, open voltage: 1 V, short circuit current: 1.2 A) having the same outer dimensions, higher power generation efficiency, and large current rating and output power using the means The solar cell array 10 was constructed by replacing and repairing and re-arranging, and connecting in parallel two strings: a string in which six E-type modules were connected in series and a string in which two H-type modules and four E-type modules were connected in series. . 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.
[0110]
As a result of simulating the array output of the solar cell array 10 under certain solar radiation and temperature conditions using the above rated values as in Example 1, Pmax was 7.6079 W, and IV mismatch loss was 1.183%. As compared with 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.
[0111]
As described above, by using the means according to the present invention, even when the solar cell module fails, the solar cell 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 configuring the solar cell array 10 by connecting the modules in series, 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 and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0112]
( Comparison Example 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.
[0113]
Since two modules of the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 27, when replacing with a new solar cell module, the present invention is not simply replaced with a new E-type module. Replacement and replacement of H-type modules with the same external dimensions and higher power generation efficiency, higher current rating and higher output power using the above means, and re-arranged them, connecting five E-type modules and one H-type module in series Two strings were formed and 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.
[0114]
As a result of simulating the output of the solar cell array 11 under certain solar radiation and temperature conditions using the above rated values in the same manner as in Example 1, the Pmax was 7.60313 W, and the IV mismatch loss was 1.269%. As compared with 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.
[0115]
As described above, by using the means according to the present invention, even when the solar cell module fails, the solar cell 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 configuring the solar cell array 11 by connecting the modules in series, 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 and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0116]
( Comparison Example 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.
[0117]
Since two of the modules in the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 28, when replacing a new solar cell module, the present invention is not simply replaced with a new E-type module. The above-mentioned means are used to replace and repair 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 that fits in the surplus space 701, and re-arranging the module. A string in which six type modules and one H-type module are connected in series, and a string in which one H-type module, four E-type modules, and two F-type modules are connected in series are connected in parallel. The battery array 12 was 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.
[0118]
As a result of simulating the array output of the solar cell array 12 under certain solar radiation and temperature conditions using the above rated values as in Example 1, the Pmax was 8.6259 W, and the IV mismatch loss was 1.328%. As compared with 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.
[0119]
From the above, using the means according to the present invention, even when the solar cell module breaks down, replace it 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 is small but adaptable to the surplus space, and connecting the respective solar cell modules in series / parallel to form the solar cell array 12, the output power is higher than that of the previous solar cell array 5 having only the E-type module. Can be greatly increased. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0120]
( Comparison Example 10)
Since two modules in the solar cell array 5 shown in FIG. 21 have failed, as shown in FIG. 29, when replacing a new solar cell module, the present invention is not simply replaced with a new E-type module. The above-mentioned means are used to replace and repair 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 that fits in the surplus space 701, and re-arranging the module. Two strings in which five type modules, one H type module, and one F type module were connected in series were formed and connected in parallel to form a solar cell array 13. 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.
[0121]
As a result of simulating the array output of the solar cell array 13 under certain solar radiation and temperature conditions using the above rated values as in Example 1, the Pmax was 8.5945 W and the IV mismatch loss was 1.688%. As compared with 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.
[0122]
From the above, using the means according to the present invention, even when the solar cell module breaks down, replace it 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 is small but adaptable to the surplus space, and connecting the respective solar cell modules in series / parallel to form the solar cell array 13, the output power is higher than that of the previous solar cell array 5 having only the E-type module. Can be greatly increased. In addition, the use of the replaceable solar cell module not only facilitates replacement and additional arrangement and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0123]
( Comparison Example 11)
As shown in FIG. 30, on the same installation surface as in Example 3, using the means of the present invention, not only E-type modules but also F-type modules having different current ratings and module areas, and six E-type modules were used. A string connected in series and a string formed by connecting eight F-type modules in series were formed, and the two strings were connected in parallel to form a solar cell array 14. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0124]
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.
[0125]
As a result of simulating the array output of the solar cell array 14 under certain solar radiation and temperature conditions using the above rated values as in Example 1, Pmax was 7.6280 W, and IV mismatch loss was 6.927%. In comparison with the conventional solar cell array 5 (maximum output power (Pmax) 7.4506 W) And thick The output power of the solar cell array 14 also increased by 0.1774 W (about 2.4%). Also, there is only one power peak.
[0126]
That is, although there is an extra space where the solar cell module cannot be installed in the conventional method even though there is an installable area, the F type module differs from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. Are arranged in series, the surplus space can be reduced, and the overall output can be greatly increased.
[0127]
(Example 12)
Figure 31 As shown in the figure, on the same installation surface as in Example 3, 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. Two strings were formed by connecting four type modules in series, and the two strings were connected in parallel to form a solar cell array 15. The voltage of each solar cell string falls within the input voltage range of the inverter. Further, a bypass diode is arranged in each solar cell module.
[0128]
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.
[0129]
As a result of simulating the array output of the solar cell array 15 under certain solar radiation and temperature conditions using the above rated values as in Example 1, Pmax was 8.1138 W, and IV mismatch loss was 1.000%. As compared with 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.
[0130]
That is, although there is an extra space where the solar cell module cannot be installed in the conventional method even though there is an installable area, the F type module differs from the E type module in the current rating, the cell area, the electric characteristics of the cell, and the module area. Are arranged in series and in parallel, the surplus space can be reduced, and the overall output can be greatly increased.
[0131]
( Comparison Example 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.
[0132]
Since one module of the solar cell array 5 shown in FIG. 21 has failed, as shown in FIG. 32, when replacing with a new solar cell module, the present invention is not simply replaced 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, higher power generation efficiency, higher current rating and higher output power using the means described in One solar cell array 16 was formed by connecting two strings of one string and five E-type modules connected in series. 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.
[0133]
As a result of simulating the array output of the solar cell array 16 under certain solar radiation and temperature conditions using the above rated values in the same manner as in Example 1, the Pmax was 7.5257 W, and the IV mismatch loss was 0.648%. As compared with 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.
[0134]
As described above, by using the means according to the present invention, even when the solar cell module fails, the solar cell 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 configuring the solar cell array 16 by connecting the modules in series / parallel, 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 and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0135]
( Comparison Example 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.
[0136]
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, the present invention is not simply replaced 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, higher power generation efficiency, higher current rating and higher output power, and A string in which five sheets 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 falls within the input voltage range of the inverter, and each solar cell module is provided with a bypass diode.
[0137]
As a result of simulating the array output of the solar cell array 17 under certain solar radiation and temperature conditions using the above-mentioned rated values as in Example 1, the Pmax was 7.5257 W and the IV mismatch loss was 0.648%. As compared with 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.
[0138]
As described above, by using the means according to the present invention, even when the solar cell module fails, the solar cell 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 configuring the solar cell array 17 by connecting the modules in series, 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 and repair as described above, but also greatly increases the output power by using the means of the present invention. It became possible to increase.
[0139]
The above-described embodiments are examples of preferred embodiments of the present invention, but 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]
【The invention's effect】
As described above, the solar cell array configuration method of the present invention has the following effects.
[0141]
At least one solar cell string includes two types of solar cell modules having different current ratings. By using a solar cell array, 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, and the degree of freedom in design becomes 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 as much as possible without waste, and as much as possible in the limited space of the installable area The output of the solar cell array can be increased.
[0142]
Furthermore, the array configuration is such that 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. Good output can be obtained.
[0143]
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, an optimal solar cell array can be obtained. By performing replacement arrangement or additional arrangement on the solar cell module, repair can be performed, and output power can be significantly increased. Naturally, not only in the case of failure, but also replacing / additional arrangement of some solar cell modules of the existing solar cell array with the optimum solar cell module by using the means of the present invention to increase output. Is also possible.
[Brief description of the drawings]
FIG. 1 is a conceptual 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 southern surface of a roof 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.
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 roof layout diagram in 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 a 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. Examples 5, 6, 12 and Comparative Examples 3, 4, 7 to 11, 13, 14 It is a conceptual diagram of the installation surface and the solar cell module used in FIG.
FIG. 21 is a layout view of a roof on which a conventional solar cell array is installed.
FIG. Comparison FIG. 11 is a roof layout diagram in which a solar cell array according to a third embodiment is installed.
FIG. 23 Comparison FIG. 13 is a layout plan of a roof on which a solar cell array according to a 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 diagram of a roof on which a solar cell array according to a sixth embodiment is installed.
FIG. 26 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 7.
FIG. 27 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 8.
FIG. 28 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 9.
FIG. 29 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 10.
FIG. 30 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 11.
FIG. 31 is a layout view of a roof on which a solar cell array of Example 12 is installed.
FIG. 32 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 13.
FIG. 33 Comparison It is a roof arrangement | positioning figure which installed the solar cell array of Example 14.

Claims (13)

In 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, at least one solar cell string is formed by connecting two types of solar cell modules having different solar cell areas and current ratings in series. And a voltage-power characteristic of the solar cell array having only one power peak. 2. The solar cell array according to claim 1, wherein each solar cell string includes at least two or more types of solar cell modules having different current ratings, and each solar cell string has the same electrical characteristics. The solar cell array according to claim 1 or 2, wherein the different solar cell module of the current rating, which is different from the solar cell module of solar cells electrical characteristics. The solar cell array according to any one of claims 1 to 3, wherein the solar cell modules having different current ratings are solar cell modules having different solar cell module areas. The solar cell array according to any one of claims 1-4, wherein the solar cell module is an amorphous silicon solar cell module. The solar cell array according to any one of claims 1 to 5, wherein a bypass diode is arranged in each solar cell of the solar cell module. The solar cell array according to any one of claims 1 to 6, wherein the solar cell module is a building material integrated solar cell module. The solar cell array according to any one of claims 1 to 7, wherein the solar cell module is a replaceable solar cell module. The solar cell array according to any one of claims 1 to 8, which is installed on a roof surface. The solar cell array according to any one of claims 1 to 9, which 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. How to repair a solar array. A solar cell power generation system, comprising: supplying power output from the solar cell array according to any one of claims 1 to 9 to a load via power conversion means. The solar cell power generation system according to claim 11 , wherein a backflow preventing blocking diode is disposed between each solar cell string and the power converter. 13. The solar cell power generation system according to claim 11 , wherein a maximum power follower is mounted on the power converter.

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