JP2010287608A - Apparatus, system and method for detecting degradation of photovoltaic power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for detecting degradation of a photovoltaic power generator, which detects degradation and faults for each module of the photovoltaic power generator in real time by a simple apparatus. <P>SOLUTION: The apparatus for detecting degradation of a photovoltaic power generator includes: a measuring means 7 for measuring a prescribed measurement value for each of the plurality of modules 5 configuring the photovoltaic power generator 2; a memory 8 for storing a prescribed reference value; and a decision means 9 for determining the degradation degree of a specified module 10 included in the plurality of modules 5 on the basis of the measurement value and the reference value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a deterioration detection device for a solar power generation device, a deterioration detection system for a solar power generation device, and a solar power generation that detect deterioration and failure of each module, which is an element constituting the solar power generation device, with a simple mechanism. The present invention relates to a device deterioration detection method.

  In recent years, photovoltaic power generation apparatuses have begun to spread in commercial facilities and general houses in order to cope with problems such as an increase in energy demand, a decrease in fossil fuels, and prevention of global warming.

  FIG. 12 is a block diagram of a general photovoltaic power generation apparatus.

  The photovoltaic power generation apparatus 800 includes a module 802 that is a unit composed of a plurality of cells 803, an array 801 in which a plurality of modules 802 are arranged in an array, a power conditioner 804 that converts a direct current into an alternating current, and a load 805. A power generation amount measuring device 806 is provided. The cell 803 is a minimum power generation unit for power generation using sunlight, which is made of a material such as crystalline silicon, thin film silicon, or a compound. A module 802 is configured by combining a plurality of cells 803. The module 802 is one power generation unit in an actual solar power generation device, and a plurality of modules 802 are connected in series or in parallel according to specifications, and the solar power generation device installed in a commercial facility or a general house An array 801 that is a power generation unit is configured.

  The modules 802 are connected in series or in parallel by current output and input, and the current generated by the module 802 is combined in the entire array 801 and used in the load 805.

  The power conditioner 804 converts the direct current from the array 801 into alternating current so that it can be used as electric power in a commercial facility or a general house. In response to the alternating current converted by the power conditioner 804, the load 805 can perform an operation based on electric power. If necessary, a power generation amount measuring device 806 that measures the power generation amount of the entire array 801 may be provided.

  By the way, a solar power generation device is very expensive, and has not spread to commercial facilities and ordinary houses. For this reason, in order to promote the spread of solar power generation devices to commercial facilities and ordinary houses, measures have become established that enable surplus power generated and generated to be sold at attractive prices.

  On the other hand, since a solar power generation device is installed on the roof or wall of a commercial facility or a general house, it is easily affected by the natural environment. For example, the solar power generation device 800 may be deteriorated due to high temperature, low temperature, wind and rain, disaster, salt damage, and the like. When the solar power generation device 800 is deteriorated in this way, a sufficient amount of power generation cannot be obtained, and the solar power generation device installed at an expensive cost becomes less attractive, which may hinder the spread.

  For this reason, the technique which performs the self-diagnosis of the array which is the maximum power generation unit of a solar power generation device is proposed (for example, refer patent document 1).

On the other hand, the self-diagnosis using the array as a unit as in Patent Document 1 has a problem that it is not possible to specify which of the modules constituting the array has deteriorated. In order to cope with this problem, a technique for diagnosing a failure or deterioration of a module constituting the array has been proposed (see, for example, Patent Documents 2 and 3).
JP-A-8-64653 JP 2008-91807 A JP 2009-21341 A

  Since Patent Document 1 can only detect deterioration or failure in units of arrays as described above, it cannot identify which of a plurality of modules included in the array has deterioration or failure. For this reason, unless a special engineer is dispatched to the installation site, it is impossible to identify and cope with the problem.

  In Patent Documents 2 and 3, a specialist engineer visits the installation location and diagnoses a failure or deterioration for each module. Therefore, deterioration or failure for each module can be determined only at the timing of maintenance.

  On the other hand, in commercial buildings and general houses, receiving a diagnosis of a solar power generation device by a specialized engineer is not a good compromise in terms of cost. For this reason, the techniques of Patent Documents 1 to 3 are not apparatuses or systems that sufficiently consider the cost. If the cost associated with detection of deterioration and failure is high, there is a risk that the spread of solar power generation devices to commercial facilities and general homes may be hindered.

  In addition, since it is expected to sell power from the installed solar power generation device, it requires real-time diagnosis of the solar power generation device. Have problems that can not.

  Patent Documents 2 and 3 detect module deterioration and failure from the relationship between the generated voltage value and the generated current value for each module and the relationship between the test signal and the output.

  However, it is known that the photovoltaic power generation module changes the power that can be generated depending on the temperature, and the technologies disclosed in Patent Documents 2 and 3 detect deterioration and failure using the power that takes temperature into consideration. There are no problems.

  Summarizing the above, Patent Documents 1 to 3 describe that (1) deterioration and failure of each module in real time cannot be detected, and (2) the cost of deterioration and failure detection is high, Dissemination to general homes is hindered, (3) Because detection by specialized engineers is premised on, handling in commercial facilities and general homes is difficult, (4) Degradation and failure detection accuracy is insufficient, etc. Have a problem.

  The present invention solves the above problems (1) to (4) and is a simple device that detects deterioration and failure of each module of the solar power generator in real time. It aims at providing the degradation detection system of a photovoltaic power generation apparatus, and the degradation detection method of a photovoltaic power generation apparatus.

  In view of the above problems, the degradation detection device for a solar power generation device of the present invention stores a measurement unit that measures a predetermined measurement value and a predetermined reference value for each of a plurality of modules constituting the solar power generation device. And a determination unit that determines a degree of deterioration of the specific module included in the plurality of modules based on the storage unit and the measurement value and the reference value.

  The degradation detection device for a photovoltaic power generation device of the present invention can detect degradation and failure in real time for each module. Further, since the detection result is output to, for example, a management center or the like, a warning of deterioration or failure is processed in real time. At this time, it is not necessary to dispatch a special engineer to the actual installation location, and it is not necessary for the subject who has installed the solar power generation device to perform the detection work. For this reason, the problem of a solar power generation device is detected in real time, without burdening the installer of a solar power generation device.

  Moreover, since the problem of a solar power generation device is detected in real time, the secured amount of power generation by the solar power generation device is improved, and motivation for the spread of the solar power generation device is improved.

  A degradation detection device for a solar power generation device according to a first aspect of the present invention stores a measurement unit that measures a predetermined measurement value and a predetermined reference value for each of a plurality of modules constituting the solar power generation device. And a determination unit that determines the degree of deterioration of the specific module included in the plurality of modules based on the measurement value and the reference value.

  With this configuration, it is possible to detect defects and deterioration in units of a plurality of modules constituting the solar power generation device. By detecting deterioration in finer units, the accuracy of repairs and treatments can be increased, and repair costs can be reduced. Also, real-time detection is possible.

  In the deterioration detection device for a solar power generation device according to the second invention of the present invention, in addition to the first invention, the predetermined measurement values are a generated current value generated by the specific module and the temperature of the specific module. Includes at least one of the measured temperature values.

  With this configuration, it is possible to detect the deterioration of the module in consideration of weather conditions.

  In the deterioration detection device for a photovoltaic power generation apparatus according to the third invention of the present invention, in addition to the first or second invention, when the reference value is an ideal current value that can be generated by the specific module, the determination means Calculates a difference value between the generated current value and the ideal current value of the specific module based on the measured temperature value, and determines that the specific module is in a deteriorated state if the difference value is equal to or greater than a predetermined value.

  With this configuration, the deterioration state of each module can be determined after comparison with the specifications of each module.

  In the deterioration detection device for a photovoltaic power generation apparatus according to the fourth invention of the present invention, in addition to the third invention, the determination means calculates and specifies a corrected ideal current value obtained by correcting the ideal current value with the measured temperature value. A difference value between the generated current value of the module and the corrected ideal current value is calculated, and if the difference value is equal to or greater than a predetermined value, the specific module is determined as a deteriorated state.

  With this configuration, it is possible to determine the deterioration state for each module in consideration of the power generation state that can change depending on the temperature.

  In the deterioration detection device for a solar power generation device according to the fifth aspect of the present invention, in addition to any one of the first to fourth aspects, the reference value is an average value of the generated current values of the plurality of modules. In some cases, the determination unit calculates a difference value between the generated current value and the average value of the specific module, and determines that the specific module is in a deteriorated state if the difference value is equal to or greater than a predetermined value.

  With this configuration, it is possible to determine the deterioration state of a module not based on an absolute reference but based on a relative relationship with a plurality of modules.

  In the deterioration detection device for a solar power generation device according to the sixth invention of the present invention, in addition to any of the first to fifth inventions, the determination means may be configured such that the generated current value of the specific module is equal to or less than a predetermined value. The specific module is determined as a failure state.

  With this configuration, a module whose power generation state is extremely poor can be immediately determined as a failure, and a smooth connection to repair or replacement of the failed module becomes possible.

  In addition to any one of the first to sixth inventions, the deterioration detection device for a solar power generation device according to the seventh invention of the present invention further includes a cumulative value storage unit that stores the measured values over a predetermined period. The determination means determines that the change in the generated current value of the specific module in the predetermined period is larger than the expected change in the ideal current value or the corrected ideal current value in the predetermined period, and the difference between the changes is equal to or greater than the predetermined value. The specific module is determined as a deteriorated state.

  With this configuration, it is possible to determine the deterioration state of the module based on the secular change. By using the secular change as a reference, the deterioration state of the module can be determined with higher accuracy and a state in accordance with actual use.

  In the deterioration detection device for a solar power generation device according to the eighth aspect of the present invention, in addition to any one of the first to sixth aspects, the determination means may determine whether the accumulated value of the generated current value of the specific module in a predetermined period is When the difference between the accumulated current values is smaller than the accumulated value of the ideal current value or the corrected ideal current value in the predetermined period and the accumulated value is equal to or larger than the predetermined value, the specific module is determined as the deteriorated state.

  With this configuration, it is possible to determine the deterioration state of the module based on the secular change. By using the secular change as a reference, the deterioration state of the module can be determined with higher accuracy and a state in accordance with actual use.

  In the deterioration detection device for a solar power generation device according to the ninth aspect of the present invention, in addition to any one of the first to sixth aspects, the storage unit stores the sunshine hours in a predetermined period of the specific module. The determination means determines that a difference value between a multiplication value of the generated current value of the specific module and the sunshine time in a predetermined period and an ideal current value in the predetermined period or a multiplication value of the corrected ideal current value and the sunshine time is a predetermined value or more. In this case, the specific module is determined as a deteriorated state.

  With this configuration, it is possible to determine the deterioration state of the module with high accuracy considering that the amount of power generation varies depending on the sunshine duration.

  In the deterioration detection device for a solar power generation device according to the tenth invention of the present invention, in addition to any of the third to ninth inventions, the determination means may include the specific module at a predetermined number of times at a plurality of different timings. When determining that it is in a deteriorated state, the determining means determines the specific module as a deteriorated module.

  With this configuration, determination accuracy and reliability with respect to a determination result are improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In addition, the module in this specification is a unit composed of a plurality of cells in the solar power generation device, and is a part sometimes called a panel. However, it is not limited to a detailed meaning, and indicates each of a plurality of units constituting a solar power generation apparatus installed in a commercial facility or a general house.

(Embodiment 1)
First, the outline | summary of the degradation detection apparatus of the solar power generation device in Embodiment 1 is demonstrated.

(Overview)
FIG. 1 is a block diagram of a deterioration detection device for a photovoltaic power generator according to Embodiment 1 of the present invention. In addition, FIG. 1 has shown a part of solar power generation device and the degradation detection apparatus of a solar power generation device in the same drawing.

  The solar power generation device 2 includes an array 4, a plurality of modules 5 that constitute the array 4, and a cell 6 that is a minimum power generation unit that constitutes each of the plurality of modules 5. Although a power conditioner and the like are originally provided, they are omitted for convenience of explanation.

  A deterioration detection device 3 of a solar power generation device (hereinafter referred to as “deterioration detection device” for the sake of simplicity) is connected to the solar power generation device 2 and includes a plurality of modules 5 included in the solar power generation device 2. Detect degradation.

  For each of the plurality of modules 5, the deterioration detection device 3 includes a measuring unit 7 that measures a predetermined measurement value, a storage unit 8 that stores a predetermined reference value, and a plurality of modules based on the measurement value and the reference value. Determination means 9 for determining the degree of deterioration of the included specific module.

  Here, the lower left module included in the array 4 is defined as a specific module 10.

  The measuring unit 7 measures at least one of a generated current value generated by each of the plurality of modules 5 and a measured temperature value that is a temperature of each of the plurality of modules 5. At this time, the measuring means 7 may be provided in each of the plurality of modules 5 or may be provided collectively for the plurality of modules. The measuring unit outputs the generated current value and the measured temperature value measured by each of the plurality of modules 5 to the determining unit 9.

  The storage unit 8 stores a reference value serving as a predetermined reference for the determination unit 9 to determine the deterioration state of the specific module 10. In FIG. 1, the storage unit 8 is described as an element different from the determination unit 9, but may be an element included in the determination unit 9.

  The determination unit 9 reads the reference value from the storage unit 8. Further, the generated current value and the measured temperature value of the specific module 10 are read from the measuring means 7.

  The determination means compares the generated current value, which is a measured value, with a reference value. At this time, the generated current value and the reference value may be simply compared, or may be compared based on the measured temperature value. Alternatively, the determination unit 9 may compare the generated current value with the reference value after correcting either the generated current value or the reference value with the measured temperature value. In order to make a comparison with the generated current value, the reference value is also preferably an ideal current value that can be generated by the specific module 10. Since the determination is performed in consideration of the measured temperature value, module deterioration detection that is not easily influenced by the weather or weather conditions is performed.

  The determination unit 9 determines deterioration / failure of the specific module 10 based on the comparison between the generated current value and the reference value. The determination unit 9 outputs a determination result.

  In addition, since the determination means 9 can determine immediately if the measurement means 7 obtains a measured value, the deterioration detection apparatus 3 can detect deterioration of a module in real time. Further, if the measurement means 7 continuously measures the measurement value, the determination means 9 can also continuously determine the degree of deterioration of the module. For this reason, the deterioration detection device 3 can always detect the deterioration of the module.

  At this time, the determination means 9 determines each of the plurality of modules 5 as a specific module to be determined in order or in parallel, and detects which of the plurality of modules 5 has deteriorated or failed. To do. In the solar power generation device 2, an ID number indicating a position is often given to each of the plurality of modules 5 included in the array 4. The determination unit 9 determines deterioration / failure after reading the ID number of the specific module to be determined. As a result, the determination unit 9 can determine the deterioration / failure of the module specified by the ID number and output the determination result. That is, the deterioration detection device 3 can specify which module has an abnormality among the plurality of modules included in the array 4.

  The determination result is communicated to the installer or the management center by wired communication or wireless communication.

  When the installer or the management center receives the determination result, the installer or the management center responds according to the determination result. For example, the installer or the management center makes arrangements for repairing or replacing a deteriorated or malfunctioning module, or performs a process of separating the degraded or malfunctioning module from the solar power generation device 2. To do.

  As described above, the deterioration detection device 3 is less susceptible to the weather and weather conditions, and can detect the deterioration of the module whose position is specified in real time.

  Next, the detail of each part is demonstrated.

(Measuring means)
First, the measuring means 7 will be described.

  The measuring means 7 measures a predetermined measurement value for each of the plurality of modules 5. The predetermined measured value includes at least one of a generated current value generated by each of the plurality of modules 5 and a measured temperature value that is a temperature of each of the plurality of modules 5. Further, the measurement value may include the sunshine hours in each of the plurality of modules 5.

  The measuring means 7 uses a current measuring device and a temperature measuring device installed in each of the plurality of modules 5 (the two devices may be integrated or separated) to generate power from the module 5. Measure the current value and measurement temperature value. For example, the current measuring device is connected to an input / output signal line that connects a module of the plurality of modules 5 to another module, thereby measuring a generated current value that is actually generated by the module.

  A contact thermometer or a non-contact thermometer is used as the temperature measuring device.

  The temperature measuring device measures the temperature at a position determined by the specification among various positions such as the surface of the module, the inside of the module, the vicinity of the center of the module, and the vicinity of the end of the module. Alternatively, the temperature measuring device measures an average value of temperatures at all positions such as the surface of the module, the inside of the module, the vicinity of the center of the module, and the vicinity of the end of the module as a measured temperature value.

  The measuring means 7 may measure the sunshine hours in each of the plurality of modules 5. Sunlight hours are measured using a luminometer.

  The measuring means 7 measures the generated current value and the measured temperature value using such a current measuring device or temperature measuring device. Further, the measuring means 7 may store these measured values in a storage device including a semiconductor memory, a magnetic memory, an optical disk, and the like.

  The measuring unit 7 outputs the measured value to the determining unit 9. At this time, the measuring unit 7 may output the measured value to the determining unit 9 itself, or may output the measured value based on a request from the determining unit 9.

  Note that the measurement means 7 does not always have to measure the measurement values for all of the plurality of modules 5 included in the array 4. The measuring means 7 may select one of the plurality of modules 5 and measure the measured value according to the specification or the administrator's setting.

  The array 4 includes a plurality of modules 5, and each of the plurality of modules 5 is assigned an identifier indicating a position in the array 4. The measuring means 7 identifies the identifier of the specific module 10 in accordance with the measurement of the generated current value and the measured temperature value of the specific module 10. By reading the identifier, it is easy for the installer or administrator to determine which position in the array 4 the deterioration is detected for.

  The measuring means 7 outputs the identifier of the specific module together when outputting the measured value. As a result, when the measurement value is stored in the storage unit 8, the measurement value is stored together with an identifier indicating the position of the module in the array 4. Similarly, when the determination means 9 determines the degree of deterioration of a specific module, it can be determined after identifying the module at which position by the identifier indicating the position in the array 4.

(Memory part)
Next, the storage unit 8 will be described.

  The storage unit 8 stores a reference value. The storage unit 8 includes various devices that can store electronic data, such as a semiconductor memory, an optical disk, a magnetic disk, and a hard disk drive. The storage unit 8 may be an element different from the measurement unit 7 and the determination unit 9 or may be an integral element. For example, the storage unit 8 may store the measurement value measured by the measurement unit 7 together with the reference value.

  The storage unit 8 outputs the stored reference value to the determination unit 9. At this time, the storage unit 8 may output the reference value to the determination unit 9 itself, or may output the reference value based on a request from the determination unit 9.

  The reference value includes an ideal ideal current value inherently included in the specific module 10 to be determined by the determination unit 9 for determining the degree of deterioration. The ideal current value can be obtained from, for example, a data sheet provided by a module or array manufacturer of the photovoltaic power generation apparatus. FIG. 2 is an explanatory diagram for explaining a data sheet according to Embodiment 1 of the present invention, and FIG. 2 shows an example of the data sheet.

  In many cases, data sheets describe ideal current values that can be generated according to the type of module. For example, as shown in FIG. 2, the minimum value (Min), the intermediate value (Typ), and the maximum value (Max). ).

  The ideal current value indicates a current value at which the specific module 10 can generate electricity ideally, and the degree of deterioration of the specific module 10 is determined based on a deviation state between the ideal current value and the generated current value actually generated. it can.

  The storage unit 8 may store a corrected ideal current value obtained by correcting the ideal current value with the measured temperature value. Or you may memorize | store the average value and total value of the electric power generation current value measured by each of the some module 5 with which the array 4 is provided.

  This is because the determination means may determine the degree of deterioration of the specific module 10 based on the corrected ideal current value, the average value of the generated current values, the total value of the generated current values, and the like.

  In addition, the memory | storage part 8 may be installed close to the installation place of the solar power generation device 2, and may be installed separately. For example, the memory | storage part 8 may be installed in the management center which manages the solar power generation apparatus installed in many places collectively.

(Judgment means)
Next, the determination means 9 will be described.

  The determination unit 9 determines the degree of deterioration of the specific module 10 based on the measurement value and the reference value. In general, when the measured generated current value of the specific module 10 has a predetermined deviation or more from the ideal current value, the determination unit 9 determines the specific module 10 as a deteriorated state. Or the determination means 9 determines the specific module 10 as a failure state.

  Note that at least one of the measurement unit 7 and the determination unit 9 can identify an identifier that specifies the position of the specific module 10 among the plurality of modules 5 included in the array 4. Therefore, the determination unit 9 can output the determination result of the deterioration degree of the specific module 10 after specifying the position of the module 10 in the plurality of modules 5. As a result, the installer or administrator of the solar power generation apparatus can immediately determine which position in the array 4 the module has deteriorated or failed, and can easily cope with the deterioration or failure. . For example, when it is necessary to replace a faulty module, the module to be replaced is easily specified because it is known which position the module has failed. Therefore, the installer or manager can immediately replace and repair only the identified module.

  The determination means 9 can determine from various viewpoints by customizing the reference value. Each will be described below.

(Judgment method 1)
The determination unit 9 calculates a difference value between the generated current value of the specific module 10 and the ideal current value. Furthermore, the determination means 9 compares this difference value with a predetermined threshold value. If the difference value is equal to or greater than the predetermined threshold, the determination unit 9 determines the specific module as a deteriorated state. In addition to the fact that the difference value is equal to or greater than the predetermined threshold value, the determination means 9 determines that the specific module 10 is in a deteriorated state, taking into account the condition that the generated current value is equal to or less than the ideal current value. You may do it.

  The ideal current value is often provided as a specification shown in FIG. 2 by a manufacturer that manufactures a module or array of the photovoltaic power generation apparatus 2. The manufacturer manufactures only the module and sells it to the contractor, and the contractor connects the necessary number of modules in series and in parallel and installs it in a commercial facility or a general house.

  The detection result of the deterioration detection device 3 is used by the installer or manager of the solar power generation device 2 (the contractor may also serve as the manager). If the installer or manager compares the generated current value of each module included in the actually installed solar power generation device 2 with the ideal current value, the module will be inferior to the specifications provided by the manufacturer. Recognized as degraded.

(Judgment method 2)
The determination means 9 corrects the ideal current value shown in the data sheet of FIG. 2 with the measured temperature value, and calculates a corrected ideal current value. Since the ideal current value shown in the data sheet is a generated current value at a predetermined temperature (usually based on room temperature), the current value that can be generated by the module may change depending on the temperature change of the module. . For example, it is known that as the temperature of the module rises, the current value that can be generated by the module becomes smaller than the ideal current value based on room temperature.

  Considering this, since the ideal current value is a current value that can be generated at room temperature, it is not possible to determine the degree of deterioration of the module simply by comparing the generated current value of the module with the ideal current value. It can be said that the comparison with the ideal current value is also a simple process, so it is possible to decide whether to use the ideal current value and the corrected ideal current value for comparison according to the request of the installer or administrator. Just fine).

  Therefore, the determination unit 9 calculates a corrected ideal current value obtained by correcting the ideal current value with the measured temperature value, and uses the corrected ideal current value for comparison with the generated current value. That is, the reference value is a corrected ideal current value. The corrected ideal current value may be stored in the storage unit 8 or may be held by the determination unit 9.

  The corrected ideal current value may be obtained by multiplying the ideal current value by the measured temperature value by a predetermined formula, or may be obtained by a correspondence table. Alternatively, as shown in FIG. 3, a corrected ideal current value may be obtained according to a correction function that corrects the ideal current value according to temperature. FIG. 3 is a graph showing the relationship between the corrected ideal current value and the temperature in the first embodiment of the present invention.

  Although FIG. 3 shows an example, the corrected ideal current value at room temperature (temperature indicating the ideal current value shown in the data sheet) is maximized, and the corrected ideal current value decreases as the temperature rises from room temperature. As the value decreases, the corrected ideal current value decreases. That is, the corrected ideal current value in consideration of the external environment with respect to the solar power generation device 2 is obtained.

  Of course, the graph of FIG. 3 is an example, and the graph may have a curve (straight line) in which the corrected ideal current value decreases as the temperature increases.

  The determination unit 9 calculates a corrected ideal current value using the ideal current value and the measured temperature value stored in the storage unit 8, and compares the corrected ideal current value with the generated current value to determine the degree of deterioration of the module. To detect.

  The determination unit 9 reads the generated current value and the measured temperature value of the specific module 10. Further, the ideal current value is read out. A corrected ideal current value is calculated using the read measured temperature value and ideal current value. Next, the determination unit 9 calculates a difference value between the generated current value and the corrected ideal current value. At this time, when the difference value is equal to or greater than a predetermined threshold, the determination unit 9 determines the specific module 10 as a deteriorated state. Note that the determination unit 9 may determine that the generated current value is smaller than the corrected ideal current value and the difference value is equal to or greater than a predetermined threshold value as a condition for deterioration.

  Here, the ideal current value is corrected using the measured temperature value, but the generated current value is corrected using the measured temperature value, and the generated current value corrected by the measured temperature value is compared with the ideal current value. Based on the above, the determination unit 9 may determine the deterioration state of the specific module 10.

(Judgment method 3)
At least one of the determination unit 9 and the measurement unit 7 calculates an average value of the generated current values of all (or a majority) of the plurality of modules 10. The storage unit 8 stores this average value as a reference value. Alternatively, the determination unit 9 determines the deterioration state of the joule 10 using the average value calculated by the measurement unit 7 or using the average value calculated by itself.

  Each of the plurality of modules 5 included in the array 4 has an ideal current value described in the data sheet. The deterioration detection device 3 detects the deterioration state for each module with reference to this ideal current value (or corrected ideal current value). However, it may be preferable to determine the deterioration state for each module not by comparison with such an absolute value but by relative comparison between a plurality of modules. For example, when years have passed since the installation of the solar power generation device 2 and the solar power generation device 2 as a whole has deteriorated over time, the deterioration is detected by comparing individual modules with absolute values. Not appropriate. This is because many modules included in the array 4 may be detected as a deteriorated state.

  In the photovoltaic power generation apparatus 2 that is premised on deterioration over time, it is more appropriate to detect the deterioration state based on the quality of the module among the plurality of modules 5.

  The determination unit 9 calculates a difference value between the generated current value of the specific module 10 and the average value.

  The determination unit 9 determines that the specific module 10 is in a deteriorated state when the difference value is equal to or greater than a predetermined threshold value. At this time, the degradation condition may be that the generated current value of the specific module 10 is smaller than the average value and the difference value is equal to or greater than a predetermined threshold value.

  As described above, it is also preferable to determine the deterioration state of the specific module 10 by relative positioning among the plurality of modules 5 included in the array 4.

  Note that the determination unit 9 may use a current value (current value in the power conditioner) generated by the entire array 4 as a comparison reference instead of the average value of the generated current values of the plurality of modules.

(Judgment method 4)
When the generated current value of the specific module 10 is equal to or less than a predetermined value, the determination unit 9 determines the specific module 10 as a failure state. Regardless of the comparison with the ideal current value or the corrected ideal current value, the specific module 10 that does not generate the minimum power generation amount is considered to be in a failure state. For this reason, when the current value corresponding to the minimum power generation amount is determined as a predetermined value, the determination unit 9 determines that the specific module 10 is in a failure state when the generated current value is equal to or less than the predetermined value.

  Further, as shown in FIG. 4, the determination means 9 compares the generated current value with a predetermined value at each of a plurality of different timings, and determines when the comparison result equal to or less than the predetermined value is equal to or greater than the predetermined number of times. The means 9 may determine that the specific module is in a failure state.

  FIG. 4 is an explanatory diagram for determining a failure state in the first embodiment of the present invention.

  As shown in FIG. 4, the determination unit 9 compares the generated current value of the specific module 10 with a predetermined value over six times from timing t1 to t6. Only at the timing t4, the generated current value exceeds the predetermined value. However, at other timings, the generated current value is below a predetermined value. Thus, since the generated current value is less than the predetermined value in the majority of the comparison times, the determination unit 9 determines that the specific module 10 is in a failure state.

  As described above, when the generated current value of the specific module 10 is equal to or less than the predetermined value, the determination unit 9 determines that the specific module 10 is in a failure state.

(Determination method # 5)
The determination means 9 not only determines the deterioration state of the specific module 10 by determination at a specific timing or determination at a plurality of timings, but also determines the deterioration of the specific module 10 based on the change of the specific module 10 in a predetermined period. Determine the state. By determining based on the change in the generated current value over a predetermined period, determination with higher accuracy is performed.

  Only by comparing the generated current value and the reference value at a certain timing, the determination result may vary depending on external factors such as weather conditions, external conditions, internal conditions, and errors. Variations in this determination result can be reduced by comparison at a plurality of timings. However, it is often more appropriate for the deterioration of the module to be determined by the aging deterioration with the passage of time than by the generated current value at the specific time.

  In determination method No. 5, the determination unit 9 determines the deterioration state of the specific module 10 based on the difference between the change in the generated current value over a predetermined period and the predicted change in the ideal current value or the corrected ideal current value.

  The degradation detection device 3 further includes a cumulative value storage unit 20 that stores measurement values such as a generated current value and a measured temperature value over a predetermined period. The cumulative value storage unit 20 stores a cumulative value of the generated current value in a predetermined period and a change curve of the generated current value in the predetermined period. FIG. 5 is a block diagram of the deterioration detection apparatus for the photovoltaic power generation apparatus according to Embodiment 1 of the present invention. The deterioration detection device 3 includes a cumulative value storage unit 20.

  The determination unit 9 reads the accumulated value of the generated current value of the specific module 10 stored in the accumulated value storage unit 20 or the generated current value at every predetermined timing. The determination means 9 plots the generated current value for each predetermined timing on the graph. At this time, the generated current value is plotted over a predetermined period. Further, the determination unit 9 plots an expected change curve of the ideal current value (or corrected ideal current value) stored in the storage unit 8 over a predetermined period on a graph. It should be noted that the change curve of the generated current value and the change curve of the ideal current value may be calculated by the determination unit 9, or may be stored after being calculated by the storage unit 8 and the cumulative storage unit 20.

  Thus, the determination means 9 plots the generated current value change curve and the ideal current value change curve (or the corrected ideal current value change curve) on a graph. The plotted graph is as shown in FIG. FIG. 6 is a graph showing a time change curve of the generated current value and the ideal current value in the first embodiment of the present invention.

  As shown in FIG. 6, the generated current value may gradually decrease during the predetermined period due to the aging of the specific module 10. In addition, it is expected that the ideal current value of the module itself will decrease due to aging after shipment from the factory. The change in the ideal current value during the predetermined period can be obtained from the data sheet shown in FIG. The determination unit 9 compares the change curve of the generated current value with the change curve of the ideal current value. At this time, as shown in FIG. 6, when the change curve of the generated current value has a large divergence (difference) with respect to the change curve of the ideal current value, the specific module 10 causes aged deterioration. It is thought that there is.

  For this reason, the determination unit 9 that detects the state of FIG. 6 determines the specific module 10 as a deteriorated state. That is, the determination unit 9 determines the specific module 10 as a deteriorated state when the change in the generated current value in the predetermined period is larger than the expected change in the ideal current value in the predetermined period. .

  As described above, it is also preferable that the determination unit 9 determines the deterioration state of the specific module 10 in consideration of the time factor.

  In FIG. 6, the change in the ideal current value is used as the criterion for determination. However, the change in the corrected ideal current value corrected by the measured temperature value may be used as the criterion for determination.

(Determination method 6)
The determination unit 9 determines the deterioration state of the specific module 10 based on the cumulative value of the generated current value of the specific module 10 stored in the cumulative value storage unit 20.

  FIG. 7 is a graph comparing the accumulated value of the generated current value and the accumulated value of the ideal current value in the first embodiment of the present invention.

  The determination unit 9 reads the accumulated value of the generated current value of the specific module 10 from the accumulated value storage unit 20. In addition, the determination unit 9 reads out the accumulated value of the ideal current value or the corrected ideal current value from the storage unit 8 (or reads out the ideal current value or the corrected ideal current value and performs an accumulation operation over a predetermined period). These accumulated values are accumulated values in a predetermined period.

  The accumulated value of the ideal current values shown in the graph of FIG. 7 is obtained by multiplying data obtained from the data sheet and a predetermined period. As the time increases, the cumulative value of the ideal current value increases.

  On the other hand, the accumulated value of the generated current value also increases as the time increases. It is as the graph of FIG. Here, as shown in FIG. 7, the increase rate of the accumulated value of the generated current value deteriorates with time, and a difference from the accumulated value of the ideal current value may occur. If this difference is greater than or equal to a predetermined value, the determination unit 9 determines that the specific module 10 is in a deteriorated state. This is because it is clear over a predetermined period that the generated current value does not produce the original power generation amount.

  The cumulative value storage unit 20 may be integrated with or separate from the storage unit 8.

  In FIG. 7, the change in the ideal current value is used as a criterion for determination. However, the change in the corrected ideal current value corrected by the measured temperature value may be used as the criterion for determination.

  As in the determination methods 5 and 6, determining the deterioration state of the module based on the change in the predetermined period or the accumulated value can easily detect the aged deterioration that is likely to occur in the module.

(Judgment method 7)
The determination unit 9 may determine the deterioration state of the module in consideration of the sunshine time.

  The storage unit 8 stores sunshine hours in a predetermined period. This sunshine time may be a result of measuring the actual sunshine time in a predetermined period using an illuminometer, or a result calculated based on accumulated weather data.

  In the former case, the measuring means 7 measures the sunshine time in addition to the generated current value and temperature, and stores the measured value in the storage unit 8. By storing the sunshine hours over a predetermined period, the accumulated value of the sunshine hours in the predetermined period is stored. In the latter case, the storage unit 8 stores general sunshine hours calculated from the past predetermined years (for example, one month in July is 300 hours, etc.).

  The generated current value of the specific module 10 also depends on the sunshine time. For this reason, the determination means 9 determines the deterioration state of the specific module 10 after considering the element of the sunshine time in consideration of the generated current value and the ideal current value.

  The determination unit 9 multiplies the accumulated value (or average value) of the generated current values in the predetermined period by the accumulated value (or average value) of the sunshine hours in the predetermined period. This multiplication result is taken as a first multiplication result.

  Similarly, the determination unit 9 multiplies the cumulative value (or average value) of ideal current values (or corrected ideal current values) in a predetermined period by the cumulative value (or average value) of sunshine hours in the predetermined period. This multiplication result is taken as a second multiplication result.

  The determination unit 9 compares the first multiplication result and the second multiplication result to calculate a difference value. When the difference value is equal to or greater than a predetermined threshold, the determination unit 9 determines that the specific module 10 is in a deteriorated state. At this time, the weighting condition may be that the first multiplication result is smaller than the second multiplication result.

  Further, by using both the sunshine duration and the measured temperature value as correction elements for the generated current value and the ideal current value, it is possible to detect the deterioration of the module more reflecting the weather conditions and external conditions.

  For example, after multiplying the sunshine duration and the measured temperature value by both the generated current value and the ideal current value, the respective multiplication results are compared. The determination means 9 determines the deterioration state of the module based on the comparison result.

  In all of the determination methods 1 to 7 described above, the determination unit 9 determines each module of the plurality of modules 5 included in the array 4 as the specific module 10 each time, and is included in the array 4. Judgment of deterioration state is performed for all modules. Alternatively, the deterioration state of all necessary modules is determined.

  Moreover, the determination means 9 determines the deterioration state of the specific module at a plurality of different timings in each of the above determination methods. At this time, the specific module may be determined to be a degraded module when the number of times determined to be in a degraded state at a plurality of timings is equal to or greater than a predetermined number. That is, in addition to the determination result using the above-described determination method at a certain timing being in a deteriorated state, the determination result using the above-described determination method at another timing is in a deteriorated state. It is determined that the specific module 10 is in a true deterioration state. That is, only a determination result at a certain timing may be used, or a total result of determination results at a plurality of timings may be used.

  As described above, the deterioration or failure of the specific module 10 can be determined more accurately by detecting the deterioration state over a plurality of times.

  As described above, the degradation detection apparatus for the photovoltaic power generation apparatus according to Embodiment 1 can detect the degradation state of the modules included in the array in consideration of actual weather conditions and external conditions. Moreover, since the measurement means and the determination means can always operate, the deterioration detection device can detect the deterioration state of the module in real time, and it is necessary for a specialized engineer to handle it on site with a dedicated device for detection. Absent. Moreover, since the identifier given to the module can be included in the determination result, the installer or the administrator can easily grasp at which position the module is deteriorated.

  Note that part or all of the degradation detection apparatus described in the first embodiment may be configured by hardware or software. In the case of software, the central processing unit reads the program and data stored in the memory, performs a predetermined calculation (the calculation according to the determination method described in the first embodiment), and detects deterioration. . Moreover, you may implement | achieve as a method. In this case, for each of the plurality of modules constituting the solar power generation device, a predetermined measurement value is measured, a predetermined reference value stored in the storage unit is read, and a plurality of values are determined based on the measurement value and the reference value. The degree of deterioration of a specific module included in the module is determined.

(Embodiment 2)
Next, a second embodiment will be described.

  FIG. 8 is a block diagram of a deterioration detection device for a solar power generation device according to Embodiment 2 of the present invention. FIG. 8 shows a part of the solar power generation device and the deterioration detection device.

  The deterioration detection device 30 includes an output unit 40 as compared with the deterioration detection device 3 described in the first embodiment.

  The output unit 40 outputs at least one of the measurement value measured by the measurement unit 7 and the determination result determined by the determination unit 9. For example, the output means 40 outputs data such as the generated current value, measured temperature value, and sunshine duration for each module measured by the measuring means 7. Alternatively / in combination, the output unit 40 outputs the determination result of deterioration / non-deterioration for each module determined by the determination unit 9. At this time, after specifying the module by the identifier, the output means 40 outputs the measurement value and the determination result.

  The output means 40 outputs a measurement value and a determination result by at least one of wired communication and wireless communication. For example, the output means 40 outputs measurement values and determination results through the Internet line or telephone line. Alternatively, it is output using Bluetooth, OFDM communication, wireless LAN, etc. if it is a short distance, and is output using FM communication, AM communication, short wave communication, etc. if it is a long distance. Further, the output means 40 may output measurement values and determination results in mixed communication that is partially wired communication and partially wireless communication. The output means 40 is intended to output measurement values and determination results for necessary processing, and the communication means is not limited.

  When the output means 40 outputs the measurement value obtained by the measurement means 7, the storage unit 8 and the determination means 9 included in the deterioration detection device 3 are provided at positions separated from the measurement means 7 and the output means 40. May be.

  That is, the measurement means 7 and the output means 40 are installed in the place where the solar power generation device 2 is installed. Since the memory | storage part 8 and the determination means 9 should just determine the deterioration state of a module using the measured value received from the output means 40, the determination means 9 (and the memory | storage part 8) are installation places of the solar power generation device 2. It may be installed in a place separated from In this case, the measuring means 7 and the output means 40 are installed at each of the plurality of installation locations where the solar power generation apparatus is installed. At each of the plurality of installation locations, the measurement unit 7 measures the measurement value for each module, and the output unit 40 outputs the measurement result to the deterioration detection device installed at another location.

  FIG. 9 is a block diagram of a deterioration detection device for a solar power generation device according to Embodiment 2 of the present invention. In FIG. 9, the solar power generation device 2 is installed in three places. Each of the three solar power generation apparatuses 2 is assigned an identifier as a solar power generation apparatus. In FIG. 9, identifiers “A”, “B”, and “C” are assigned from the left. ing.

  Each of the three photovoltaic power generators 2 is provided with a measuring means 7 and an output means 40. Each of the three measuring means 7 measures a generated current value, a measured temperature value, and a sunshine time for each module included in the corresponding photovoltaic power generation apparatus, and degrades these measured values via the output means 40. It outputs to the detection apparatus 50. At this time, identifiers “A”, “B”, and “C” are assigned to each of the solar power generation devices 2, and identifiers are also assigned to each of a plurality of modules included in the solar power generation device 2. Has been. For example, the identifier of a certain module of the leftmost solar power generation device 2 in FIG. 9 is represented as “A: 5-1”. The output means 40 outputs the measured value of the module indicated by the identifier of “A: 5-1” (indicating that it is a module in the fifth column and first row of the solar power generation device A) to the deterioration detection device 50. To do.

  The degradation detection device 50 can obtain information on measured values that specify modules in different solar power generation devices 2 installed in a plurality of installation locations in this way. Based on the information of the measured value, the deterioration state of the module is determined using various reference values (reference values described in the first embodiment) stored in the storage unit 8. At this time, since the position of the determination target module is specified from both the installation location and the arrangement position in the array, the deterioration detection device 50 can detect the deterioration state after specifying the module. Note that the determination method by the determination means 9 is as described in the first embodiment.

  For example, when the photovoltaic power generation apparatus 2 is installed in a plurality of places and there is a management center that detects the deterioration state of each module of the plurality of photovoltaic power generation apparatuses, the management center is shown in FIG. The deterioration detecting device 50 to be installed is installed, and the measuring unit 7 and the output unit 9 are installed for each place where the solar power generation device is installed. The deterioration detection device 50 installed in the management center includes a determination unit 9 and a storage unit 8, and can perform deterioration detection for a plurality of photovoltaic power generation devices in a concentrated manner.

  Since the output means 40 can output the measurement value of the measurement means 7 to the management center by wire or wirelessly, the deterioration state of the module included in the photovoltaic power generation apparatus is intensively identified at the management center (the position of the module is specified). Can be detected).

  In addition, when the output means 40 outputs a determination result, the memory | storage part 8 and the determination means 9 are installed in the installation place of each solar power generation device 2. FIG. At this time, the output means 40 outputs the determination result in each solar power generation device 2 to the management center. The management center centrally determines and manages module repairs and responses based on the determination results obtained.

  In this way, the output unit 40 can realize individual or concentrated deterioration management and recovery processing of the photovoltaic power generation apparatus.

  As described above, the degradation detection apparatus for the photovoltaic power generation apparatus according to Embodiment 2 can perform individual management and intensive management by the output means.

(Embodiment 3)
Next, Embodiment 3 will be described.

  FIG. 10 is a block diagram of a degradation detection system for a solar power generation device according to Embodiment 3 of the present invention.

  The degradation detection system includes a warning generation device 81 that issues a warning based on the determination result from the degradation detection device 70 described in the first and second embodiments, a management center 80 that receives the warning, and a photovoltaic power generation device (or And a repair center 83 for repairing the solar power generation device and the module in response to a report from the management center 80.

  The deterioration detection device 70 determines the deterioration state of the specific module 10 included in the solar power generation device 2 by the procedure described in the first and second embodiments. The output means 40 outputs this determination result. The warning generator 81 receives the determination result. When the received determination result includes information indicating that it is in a deteriorated state, the warning generation device 81 issues a warning. The warning can be an audio alarm or a visual alarm such as light, image, text, email. Any of these or a combination thereof may be used.

  The management center 80 receives the warning. The management center 80 that has received the warning considers that a problem has occurred, and notifies the repair center 83 that a problem has occurred in the solar power generation device. At this time, the management center 80 can notify the repair center 83 after identifying which solar power generation device is located and which module in the solar power generation device has a problem.

  The management center 80 has a treatment device 82, and the treatment device 82 performs a predetermined treatment on the photovoltaic power generation apparatus separately / in conjunction with the repair center. For example, the solar power generation device is automatically stopped. For example, when the repair by the repair center 83 is not in time, the treatment device 82 can perform the treatment first, so that inconvenience to the installer of the solar power generation device can be solved at an early stage.

  In addition, each of the management center 80, the repair center 83, the solar power generation device 2, and the deterioration detection device 70 is preferably connected by various networks such as an Internet line, an intranet line, a telephone line, an ISDN line, and a wireless communication line. It is. This is because it gives a sense of security to the installer of the solar power generation device. By giving such a sense of security, there is also an advantage that the spread of the photovoltaic power generation device is facilitated.

  As described above, the degradation detection system for a solar power generation apparatus according to Embodiment 3 gives a sense of security to the installer of the solar power generation apparatus.

(Embodiment 4)
Next, a fourth embodiment will be described.

  FIG. 11 is a block diagram of a degradation detection device for a solar power generation device according to Embodiment 4 of the present invention.

  In the fourth embodiment, the deterioration detection device detects the deterioration of the power conditioner 90 that converts the direct current output from the array 4 of the solar power generation device into an alternating current.

  The inverter 90 is connected to the array 4.

  The power conditioner 90 is normally selected corresponding to the maximum current value (and the minimum current value) generated by the number of the modules 4 included in the array 4 or the array 4 and the connection method. For this reason, the optimal power conditioner 90 should be selected by the installer who installs a solar power generation device.

  However, problems such as deterioration and failure also occur in the power conditioner 90 due to selection mistakes and other factors. If such deterioration or failure of the power conditioner 90 is left unattended, there arises a problem that the power generation efficiency of the entire photovoltaic power generation apparatus is lowered.

  The measuring means 91 measures at least one of the temperature value and the current value of the power conditioner 90. This is because if the temperature or current value of the power conditioner 90 is abnormal, the power conditioner 90 is considered to have deteriorated or broken down. The measuring unit 91 outputs the temperature value and current value of the power conditioner 90 to at least one of the storage unit 8 and the determining unit 9. At this time, the output unit 92 outputs the measured temperature value or current value to at least one of the storage unit 8 and the determination unit 9. As with the output unit 40, the output unit 92 uses a wired or wireless unit.

  When the temperature value of the power conditioner 90 is equal to or higher than a predetermined value, the determination unit 9 determines that the power conditioner 90 is in a deteriorated state. Or the determination means 9 determines the power conditioner 90 as a deterioration state, when the electric current value of the power conditioner 90 is more than predetermined value or less than predetermined value. By such determination by the determination unit 9, the deterioration state or failure state of the power conditioner 90 is discovered early.

  The determination unit 9 determines that the power conditioner 90 is in a deteriorated state or a failure state when the temperature value of the power conditioner 90 is equal to or higher than a predetermined value over a predetermined time. Alternatively, when the current value in the power conditioner 90 (this is the total value generated by the array 4) is equal to or greater than a predetermined value or less than a predetermined value for a predetermined time or more, the power conditioner 90 is in a deteriorated state. It is determined that there is a fault condition. Alternatively, the determination unit 9 may detect a deterioration state or a failure state of the power conditioner 90 by combining the temperature value and the current value.

  Here, the output means 40 outputs the determination result as in the case of the third embodiment. The determination result includes at least one of deterioration of the specific module, deterioration of the entire array 4, and deterioration of the power conditioner 90. The management center 80 receives the determination result in the same manner as in the third embodiment and notifies the repair center 83 to prompt the repair of the module, the array 4 and the power conditioner 90, or to the extent possible. Or repair it.

  As a result, not only the deterioration of the module and the array, but also the deterioration of the power conditioner 90 can be detected at an early stage, and the problem of the solar power generation apparatus can be quickly dealt with.

  As described above, the deterioration detection device and the deterioration detection system of the photovoltaic power generation apparatus described in Embodiments 1 to 4 are examples for explaining the gist of the present invention, and modifications and modifications within the scope not departing from the gist of the present invention. including.

It is a block diagram of the degradation detection apparatus of the solar power generation device in Embodiment 1 of this invention. It is explanatory drawing explaining the data sheet in Embodiment 1 of this invention. It is a graph which shows the relationship between the correction | amendment ideal electric current value and temperature in Embodiment 1 of this invention. It is explanatory drawing which determines the failure state in Embodiment 1 of this invention. It is a block diagram of the degradation detection apparatus of the solar power generation device in Embodiment 1 of this invention. It is a graph which shows the time change curve of the electric power generation electric current value in Embodiment 1 of this invention, and an ideal electric current value. It is a graph which compares the cumulative value of the electric power generation current value in Embodiment 1 of this invention with the cumulative value of an ideal electric current value. It is a block diagram of the degradation detection apparatus of the solar power generation device in Embodiment 2 of this invention. It is a block diagram of the degradation detection apparatus of the solar power generation device in Embodiment 2 of this invention. It is a block diagram of the degradation detection system of the solar power generation device in Embodiment 3 of this invention. It is a block diagram of the degradation detection apparatus of the solar power generation device in Embodiment 4 of this invention. It is a block diagram of a common solar power generation device.

DESCRIPTION OF SYMBOLS 2 Solar power generation device 3 Degradation detection apparatus 4 Array 5 Module 6 Cell 7 Measuring means 8 Storage part 9 Judgment means 10 Specific module 20 Cumulative value storage part 40 Output means

Claims (16)

Measuring means for measuring a predetermined measurement value for each of a plurality of modules constituting the installed photovoltaic power generation device,
A storage unit for storing a predetermined reference value;
A deterioration detection device for a photovoltaic power generation apparatus, comprising: a determination unit that determines a degree of deterioration of a specific module included in the plurality of modules based on the measurement value and the reference value.   The deterioration detection device for a solar power generation device according to claim 1, wherein the predetermined measurement value includes at least one of a generated current value generated by the specific module and a measured temperature value which is a temperature of the specific module. When the reference value is an ideal current value that can be generated by the specific module,
The determination means calculates a difference value between the generated current value of the specific module and the ideal current value based on the measured temperature value, and when the difference value is a predetermined value or more, the specific module The degradation detection apparatus of the solar power generation device of Claim 1 or 2 which determines as a degradation state.   The determination unit calculates a corrected ideal current value obtained by correcting the ideal current value with the measured temperature value, calculates a difference value between the generated current value of the specific module and the corrected ideal current value, and calculates the difference value. The deterioration detection device for a solar power generation device according to claim 3, wherein when the value is equal to or greater than a predetermined value, the specific module is determined as a deterioration state. When the reference value is an average value of the generated current values of each of the plurality of modules,
The determination unit calculates a difference value between a generated current value of the specific module and the average value, and determines the specific module as a deteriorated state when the difference value is equal to or greater than a predetermined value. To 4. The deterioration detection device for a solar power generation device according to any one of 4 to 4.   6. The deterioration detection of the photovoltaic power generation apparatus according to claim 1, wherein the determination unit determines the specific module as a failure state when the generated current value of the specific module is equal to or less than a predetermined value. apparatus. A cumulative value storage unit for storing the measurement value over a predetermined period;
In the determination unit, a change in the generated current value of the specific module in the predetermined period is larger than an expected change in the ideal current value or the corrected ideal current value in the predetermined period, and a difference in change is a predetermined value. In the case of the above, the deterioration detection device for a solar power generation device according to any one of claims 1 to 6, wherein the specific module is determined as a deterioration state.   The determination unit is configured such that the accumulated value of the generated current value of the specific module in the predetermined period is smaller than the ideal current value or the corrected ideal current value in the predetermined period, and the difference between the accumulated values is equal to or greater than a predetermined value. If it is, the deterioration detection device for a solar power generation device according to any one of claims 1 to 6, wherein the specific module is determined as a deterioration state. The storage unit stores sunshine hours in the predetermined period of the specific module,
The determination means includes a multiplication value of the generated current value of the specific module and the sunshine time in the predetermined period, and a multiplication value of the ideal current value or the corrected ideal current value and the sunshine time in the predetermined period. The deterioration detection device for a solar power generation device according to any one of claims 1 to 6, wherein the specific module is determined as a deterioration state when the difference value of is not less than a predetermined value.   10. The method according to claim 3, wherein when the determination unit determines that the specific module is in a deteriorated state at a predetermined number of times at a plurality of different timings, the determination unit determines the specific module as a deterioration module. The deterioration detection apparatus of the solar power generation device of description.   The degradation detection apparatus of the solar power generation device according to any one of claims 1 to 10, further comprising output means for outputting at least one of a measurement value of the measurement means and a determination result of the determination means.   The deterioration detection device for a solar power generation device according to claim 11, wherein the output means outputs at least one of the measurement value and the determination result by at least one of wired communication and wireless communication.   The identification module includes an identifier that identifies a position in the plurality of modules, and at least one of the measurement unit and the determination unit identifies an identifier of the specific module. The degradation detection apparatus of the solar power generation device in any one. The measurement means further measures at least one of a temperature and a current value of a power conditioner that converts a direct current generated by the plurality of modules into an alternating current,
The deterioration detection device for a solar power generation device according to any one of claims 1 to 13, wherein the determination unit determines a degree of deterioration of the power conditioner based on at least one of a temperature and a current value of the power conditioner. A degradation detection device for a solar power generation device according to any one of claims 1 to 14,
A warning generator that issues a warning based on the determination result of the determination means;
A degradation detection system for a solar power generation apparatus, comprising: a treatment device that performs a predetermined treatment on the specific module based on the warning. For each of a plurality of modules constituting the installed photovoltaic power generation apparatus, a predetermined measurement value is measured,
Read a predetermined reference value stored in the storage unit,
A method for detecting deterioration of a photovoltaic power generation apparatus that determines a degree of deterioration of a specific module included in the plurality of modules based on the measured value and the reference value.

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