JP2008171860A - Method of installing solar power generation system utilizing used solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of installing a solar power generation system utilizing a used solar cell module. <P>SOLUTION: Module systems 6(1) to 6(n) of the solar power generation system 1 includes a module consisting of used solar cell modules 2A-2C produced by different manufacturers. Released voltages are measured for each of the module systems 6(1) to 6(n) (ST1) to discriminate acceptable modules from unacceptable ones (ST2) on the basis of abnormalities of an electric wiring and electrodes. The I-V characteristic of each of the module systems and the I-V characteristic of a single solar cell module in the module system are measured (ST4), and the quality is determined on the basis of the degree of deterioration of output of the measured single solar cell module (ST5). The measured value of the I-V characteristic of the module is multiplied for the number of modules constituting the module system to calculate a value (ST7), the calculated value is compared to a measured value of the I-V characteristic of the entire module system to determine the quality of the module system (ST8). Thus, a solar power generation system consisting of acceptable used solar cell modules can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a construction method of a solar power generation system for reconstructing a solar power generation system by effectively using a used solar cell module that is a component part of the disassembled solar power generation system.

  A photovoltaic power generation system that is widely used in buildings such as ordinary houses is said to have a lifetime of 40 to 50 years, which is longer than the lifetime of buildings such as ordinary houses. Therefore, even when the building is demolished, the installed photovoltaic power generation system is expected to be sufficiently in a state where it can be used. Therefore, if the solar cell module of the disassembled solar power generation system is collected and reused to construct the solar power generation system, the system can be installed at low cost, and it is also desirable from the viewpoint of environmental protection.

  However, the present situation is that there is no market for buying and selling used solar cell modules of solar power generation systems. For this reason, the solar cell module of the disassembled photovoltaic power generation system must be discarded even though it can be used.

  When reusing a solar cell module, it is necessary to evaluate the performance of the solar cell module one by one to check whether it can be reused. However, in a general residential solar power generation system, there are several tens of solar cell modules, and it takes an enormous amount of time to measure all of them at, for example, an installation location. As a result, the price of a solar power generation system using a used solar cell module increases. Therefore, it is desirable to be able to efficiently check in a short time whether a used solar cell module can be reused.

  Moreover, when constructing a solar power generation system using a used solar cell module, the number of used solar cell modules that can be procured is limited. For this reason, it may be difficult to construct a solar power generation system using only the used solar cell modules with the same manufacturer.

  In view of such a point, an object of the present invention is to provide a solar power generation system using a used solar cell module that can efficiently check whether a used solar cell module can be reused in a short time. It is to propose a construction method.

  Moreover, the subject of this invention is proposing the solar power generation system which can construct a solar power generation system, and its construction method, even when the number of used solar cell modules with the same manufacturer is insufficient. It is in.

In order to solve the above-mentioned problem, the construction method of the photovoltaic power generation system using the used solar cell module of the present invention,
A module system is configured by connecting multiple used solar cell modules in series,
This module system is formed in multiple rows,
Connect each module system in parallel to the inverter,
For each module system, open circuit voltage is measured,
It is characterized in that the measured value of the open circuit voltage is compared with the catalog value, the module system having an abnormality in the open circuit voltage value is removed and replaced with a new module system.

  In the present invention, by measuring the open circuit voltage in units of a module system composed of a plurality of solar cell modules, it is possible to detect an abnormality in the electrical wiring of each module system, such as an electrode, and a module having such an abnormality. The system can be eliminated. As described above, the quality of the module system is determined as a unit, and the reusable module system is selected, so that the operation becomes simpler than the case of inspecting the solar cell modules one by one.

Here, in the present invention,
For each module system, measure the IV characteristics of any one used solar cell module in each module system,
Compare the measured IV characteristic value of each solar cell module with the catalog value,
It is characterized in that a module system to which a used solar cell module whose degree of decrease in module output is a predetermined value or more is connected is removed and replaced with a new module system.

In the present invention,
Measure the IV characteristics of each module system,
For each module system, calculate the IV characteristics when the measured I-V characteristic values of one used solar cell module are connected in series by the number of module system components,
For each module system, compare the calculated value of the IV characteristic of the entire module system with the measured value of the IV characteristic of the entire module system,
A feature is that a module system having a variation between these values equal to or greater than a predetermined value is removed and replaced with a new module system.

  In the present invention, by measuring the IV characteristics (maximum operating voltage, maximum operating current, maximum power, etc.), it is possible to eliminate a system including a solar cell module that has a large output drop and is unsuitable for reuse. Therefore, a reusable solar cell module can be accurately selected.

  Next, according to the present invention, as the module system, at least a first module system including only a used solar cell module of a first manufacturer and a second solar cell module of a second manufacturer different from the first manufacturer are used. By connecting module systems other than the first module system having the highest voltage among the module systems to the power conditioner via the booster circuit, the voltage of each module system is configured. Is adjusted.

  In the present invention, a photovoltaic power generation system is constructed by combining module systems of used solar cell modules from different manufacturers by adjusting the voltage with a booster circuit. Usually, a solar power generation system is constructed using a module system of solar cell modules of the same manufacturer. However, there are not always the required number of used solar cell modules of the same manufacturer. Moreover, the used solar cell module of a specific manufacturer may remain in stock without being used due to insufficient number. According to the present invention, problems caused by using such a used solar cell module can be solved.

  In the present invention, whether or not a used solar cell module can be reused is determined based on a module system having a configuration in which a plurality of used solar cell modules are connected in series. Therefore, the sorting operation can be performed efficiently in a short time.

  Further, in the present invention, only the used solar cell modules of the same manufacturer are used in the module system, and the photoelectric conversion unit of the photovoltaic power generation system is constructed using the used solar cell modules of different manufacturers between the module systems. ing. Therefore, it is possible to solve the problem that the solar power generation system cannot be constructed because the inventory of a specific type of used solar cell module is small.

  Embodiments of the present invention will be described below with reference to the drawings.

(Solar power system)
FIG. 1A shows a photovoltaic power generation system constructed using a used solar cell module. The photovoltaic power generation system 1 includes a photoelectric conversion unit 3 having a configuration in which used solar cell modules 2A to 2C having a certain size that generate electricity by photoelectric conversion are arranged in a matrix, a connection box 4, and a power conditioner 5. I have. Each module system 6 (1), 6 (2)... 6 (n) is formed by connecting a plurality of used solar cell modules 2 in series. These module systems 6 (1) to 6 (n) are connected in parallel to the power conditioner 5 through the connection box 4.

  Among the plurality of rows of module systems 6 (1) to 6 (n), the module system 6 (1) is formed by connecting only the used solar cell modules 2A manufactured by Company A in series. (2) is formed by connecting only the used solar cell modules 2B manufactured by company B in series, and the module system 6 (n) is configured by connecting only the used solar cell modules 2C manufactured by company C in series. Formed. Other module systems that are not shown in the figure are formed by connecting used solar cell modules of either company B or company C in series.

  Here, the module system 6 (1) including the used solar cell module 2A manufactured by Company A is the module system having the highest voltage. Booster circuits 7 (2) -7 (n) are connected to the other module systems 6 (2) -6 (n), respectively, and these module systems 6 (2) -6 (n) The voltage is adjusted to the voltage of the module system 6 (1).

  On the other hand, FIG. 1B shows a general new photovoltaic power generation system. As shown in this figure, the solar power generation system is constructed using only solar cell modules (for example, a solar cell module manufactured by Company A) having the same manufacturer.

  In the case of using a used solar cell module, there are restrictions on the number and types of used solar cell modules to be provided. Therefore, there are problems such as the generation of used solar cell modules that cannot be used due to the shortage. In the solar power generation system 1 of this example, it is possible to use a used solar cell module efficiently by combining used solar cell modules of different manufacturers.

  Next, FIG. 2 is a schematic flowchart showing a method for determining the quality of the photovoltaic power generation system 1 constructed using the used solar cell module 2. As main deterioration factors of the used solar cell modules 2A to 2C, there can be mentioned abnormalities of electric lines such as electric wiring and electrodes, and deterioration of the glass surface and filler of the used solar cell module. In the former case, both the open circuit voltage and module output of the used solar cell modules 2A to 2C are lowered. In the latter case, only the module output decreases without decreasing the open circuit voltage.

  Therefore, in the performance pass / fail judgment method of this example, the open circuit voltage is measured for each of the module systems 6 (1) to 6 (n), and compared with the catalog value (step ST1), abnormalities such as electrical wiring and electrodes are detected. The quality is determined based on the presence or absence of (step ST2). The defective module system having an abnormality is removed and sent for repair (step ST3).

  Next, the IV characteristics (maximum operating voltage, maximum operating current, maximum power, etc.) of each module system 6 (1) -6 (n), and any module system 6 (1) -6 (n) A module that measures the IV characteristics (maximum operating voltage, maximum operating current, maximum power, etc.) of a used solar cell module and compares the measured IV characteristics of each used solar cell module with the catalog value. The degree of output decrease is examined (step ST4). A quality determination is made based on the degree of decrease in module output (step ST5), and the module system including the used solar cell modules 2A to 2C having a large degree of output decrease is removed and sent for repair (step ST6).

  Next, a value obtained by multiplying the measured values of the IV characteristics of the used solar cell modules 2A to 2C by the number of modules constituting the module systems 6 (1) to 6 (n) is calculated, Compared with the measured values of the IV characteristics of the module systems 6 (1) to 6 (n) including the used solar cell modules 2A to 2C, the variation between them is examined (step ST7). A pass / fail judgment is made based on this variation (step ST8), and a module system having a large variation is sent to a detailed inspection process to investigate the cause (step ST9).

  By performing the above pass / fail determination, the performance of the photovoltaic power generation system 1 including the used solar cell modules 2A to 2C can be secured.

  Here, usually, it is necessary to measure one by one for each used solar cell module 2A to 2C, and to perform pass / fail judgment, but in a general residential solar power generation system, the number of modules becomes several tens, It takes an enormous amount of time to measure everything at the installation site, which is not efficient. According to the pass / fail determination of this example, since the performance is determined for each module system, the number of measurements can be greatly reduced, and the determination time can be shortened.

  As described above, in this example, the used solar cell modules 2A to 2C used for the solar power generation system 1 constructed using the used solar cell modules 2A to 2C or the solar power generation system 1 under construction. Is determined in units of module systems 6 (1) to 6 (n) having a configuration in which a plurality of used solar cell modules 2A to 2C are connected in series. Therefore, the performance evaluation of the solar power generation system 1 constructed using the used solar cell modules 2A to 2C can be efficiently performed.

  Moreover, when the number of used solar cell modules 2A to 2C of the same manufacturer is insufficient and the entire photoelectric conversion unit 3 cannot be constructed, the used solar cell modules 2A to 2C of the same manufacturer are used in each module system. The photoelectric conversion unit 3 of the photovoltaic power generation system 1 can be constructed using the used solar cell modules 2A to 2C from different manufacturers among the module systems. Therefore, the problem that the photovoltaic power generation system 1 cannot be constructed because the used solar cell modules 2 of the same manufacturer are small is also solved.

(a) is a schematic block diagram of the photovoltaic power generation system constructed | assembled using the used solar cell module, (b) is a schematic block diagram of the conventional new photovoltaic power generation system. It is a flowchart which shows the performance quality determination procedure of each module system | strain of the photovoltaic power generation system installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar power generation system 2A-2C Used solar cell module 3 Photoelectric conversion part 4 Control part 5 Charging part 6 (1) -6 (n) Module system 7 (2)-7 (n) Booster circuit

Claims (5)

A module system is configured by connecting multiple used solar cell modules in series,
This module system is formed in multiple rows,
Connect each module system in parallel to the inverter,
For each module system, open circuit voltage is measured,
Compare the measured value of open-circuit voltage with the catalog value, remove the module system with abnormal open-circuit voltage value, and replace it with a new module system. Construction method. For each module system, measure the IV characteristics of any one used solar cell module in each module system,
Compare the measured IV characteristic value of each solar cell module with the catalog value,
The used solar cell module according to claim 1, wherein a module system to which a used solar cell module whose degree of decrease in module output is equal to or greater than a predetermined value is removed and replaced with a new module system. The construction method of the solar power generation system used. Measure the IV characteristics of each module system,
For each module system, calculate the IV characteristics when the measured I-V characteristic values of one used solar cell module are connected in series by the number of module system components,
For each module system, compare the calculated value of the IV characteristic of the entire module system with the measured value of the IV characteristic of the entire module system,
The method for constructing a solar power generation system using a used solar cell module according to claim 2, wherein a module system having a variation between them that exceeds a predetermined value is removed and replaced with a new module system. . As the module system,
Comprising at least a first module system consisting only of used solar cell modules of the first manufacturer and a second module system consisting only of used solar cell modules of a second manufacturer different from the first manufacturer;
A module system other than the first module system having the highest voltage among the module systems is connected to the power conditioner via a booster circuit to adjust the voltage of each module system. The construction method of the solar power generation system using the used solar cell module of any one of Claim 1 thru | or 3 to do. A solar power generation system using a used solar cell module constructed by the construction method according to claim 3,
A plurality of the module systems; and
A power conditioner in which these module systems are connected in parallel;
Within each module system, only used solar cell modules from the same manufacturer are used,
These module systems are configured using at least a first module system configured using a used solar cell module of a first manufacturer and a used solar cell module of a second manufacturer different from the first manufacturer. And the second module system
Among these module systems, except for the first module system having the highest voltage, the voltage of each module system is adjusted by connecting to the power conditioner through a booster circuit. system.

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