WO2014122705A1

WO2014122705A1 - Solar cell panel monitoring program, solar cell panel monitoring apparatus, and method for monitoring solar cell panel

Info

Publication number: WO2014122705A1
Application number: PCT/JP2013/006525
Authority: WO
Inventors: 徳幸斉藤; 大塚　潔; 浩本庄; 明忠連
Original assignee: 株式会社日立アドバンストデジタル
Priority date: 2013-02-08
Filing date: 2013-11-05
Publication date: 2014-08-14
Also published as: JP2014154728A; JP5607772B2

Abstract

The following are performed in this solar cell panel monitoring program: a state-information acquisition process for acquiring solar cell panel state information for individual solar cell panels, associating the information with the position of the solar cell panel, and storing the information in a storage unit; a panel group setting process (S11-S18) for determining at least one reference solar cell panel from a plurality of solar cell panels, bundling solar cell panels having state information for which the difference from the state information of the reference solar cell panel is within a prescribed range, and generating a same-trend panel group for each reference solar cell; and a failed-panel detection process for detecting as failed panels, among solar cell panels belonging to the same group, solar cell panels for which the time change in state information is greater than a preset threshold.

Description

Solar cell panel monitoring program, solar cell panel monitoring device, and solar cell panel monitoring method

The present invention relates to a solar cell panel monitoring program, a solar cell panel monitoring device, and a solar cell panel monitoring method, for example, a solar cell panel monitoring program, a solar cell panel monitoring device, and a solar cell power generation device that generates power using a plurality of solar cell panels. It can be used suitably for a solar cell panel monitoring method.

In recent years, attention has been focused on solar power generation devices that generate power using solar cell panels. This solar power generation device can increase the amount of power generation by arranging a plurality of solar battery panels in an array and taking a large light receiving area. However, the amount of power generated by the solar power generation device varies depending on the amount of solar radiation applied to the solar cell panel. For example, even if the same solar cell panel is used, the power generation amount varies if the region is different. In addition, the amount of solar radiation varies depending on the area due to the influence of the shadows of the clouds, the shadows of the columns arranged in the vicinity, the shadows of the roof, etc., resulting in variations in the power generation amount. Therefore, in the solar power generation device, even when a failure occurs in some of the solar battery panels, it is specified whether the decrease in the power generation amount is caused by the solar battery panel failure or the difference in the amount of solar radiation. There is a difficult problem. Therefore,

Patent Documents

1 and 2 disclose techniques for detecting defects in solar cell panels.

In Patent Document 1, the output amount of each energy conversion device is classified into a group based on a database that holds group information for grouping each energy conversion device according to the enjoyment state of solar energy. And in patent document 1, the output amount of the energy conversion apparatus which belongs to the same group is compared, the similarity of the output amount of each energy conversion apparatus is calculated | required, and based on similarity, with respect to each energy conversion apparatus A monitoring device that determines whether or not there is an abnormality is disclosed.

Patent Document 2 is a monitoring system for a photovoltaic power generation system that aggregates outputs from a plurality of solar cell panels and sends them to a power converter, and a connection box in which output electric paths from the plurality of solar cell panels are aggregated. A measuring device is provided to measure the amount of power generated by each solar cell panel. Further, in Patent Document 2, measurement data is transmitted by power line communication between a PLC modem of a slave unit connected to a measurement device and a PLC modem of a master unit provided on the power conversion device side. Collect measurement data for each battery panel.

Also, in Patent Document 2, the management device determines the presence or absence of abnormality based on the difference in the amount of power generated at the same time for each solar cell panel based on the measurement data for each solar cell panel. For example, an average value of the power generation amount of all the solar battery panels is obtained, and it is determined that it is normal if the difference from the average value is equal to or less than a predetermined threshold value, and abnormal if it is a low power generation amount that exceeds the threshold. . Furthermore, in Patent Document 2, when there is a relatively large difference in power generation between panels as a whole, an average value of power generation is obtained for each area where the sunshine conditions are approximated, and the difference exceeds the threshold in comparison with this. If the power generation amount is low, it is considered abnormal.

JP 2004-138293 A JP 2012-205078 A

However, in solar power generation devices, the solar radiation conditions may change after the device is installed. Therefore, when grouping using a fixed database is performed as in Patent Document 1, or when fixed area setting is performed as in Patent Document 2, an erroneous detection of a failure due to changes in solar radiation conditions occurs. There's a problem. For example, it is not possible to cope with changes in solar radiation conditions due to changes in solar radiation conditions due to time, changes in solar radiation conditions due to seasons, construction of new facilities, or acquired causes such as contamination of solar battery panels. There is.

One aspect of the present invention is a solar cell panel monitoring program that is executed by a solar cell panel monitoring device that includes a calculation unit that executes a program and a storage unit that holds state information of the solar cell panel. Status information acquisition processing for acquiring status information of a battery panel for each of the solar cell panels, storing the status information in the storage unit in association with a measurement time and a position of the solar cell panel, and a plurality of the solar cell panels At least one reference solar cell panel is determined, and the solar cell panels having the state information whose difference from the state information of the reference solar cell panel is within a predetermined range are bundled for each reference solar cell panel A panel group setting process for generating the same trend panel group and a time change of the state information among the solar cell panels belonging to the same group And failure panel detection processing for detecting the solar cell panel is larger than the order set threshold value as a failure panel, a solar cell panel monitoring program for.

Another aspect of the present invention is a solar cell panel monitoring apparatus that monitors characteristics of each solar cell panel with respect to a plurality of strings each including a plurality of solar cell panels connected in series. A storage unit that stores state information measured for each solar cell panel in association with a measurement time and a position of the solar cell panel, and determines at least one reference solar cell panel from a plurality of the solar cell panels, and the reference Same as the panel group setting unit that generates the same trend panel group for each reference solar cell panel by bundling the solar cell panels having the state information whose difference from the state information of the solar cell panel is within a predetermined range. Among the solar panels belonging to the group, the solar panel that has a time change of the state information larger than a preset threshold value fails A failure detecting unit that detects a panel, a solar panel monitoring device having a.

In another aspect of the present invention, a solar cell comprising a calculation unit and a storage unit for performing a characteristic monitoring process for each solar cell panel on a plurality of strings including a plurality of solar cell panels each connected in series. A solar cell panel monitoring method implemented using a battery panel monitoring device, wherein state information measured for each solar cell panel is stored in the storage unit in association with a measurement time and the position of the solar cell panel, The calculation unit analyzes the state information stored in the storage unit to determine at least one reference solar cell panel from the plurality of solar cell panels, and a difference from the state information of the reference solar cell panel is determined. Bundling the solar cell panels having the state information within a predetermined range to generate the same trend panel group for each reference solar cell panel, The solar cell panel monitoring method of analyzing the status information and detecting the solar cell panel in which the time change of the status information is greater than a preset threshold among the solar cell panels belonging to the same group as a failure panel It is.

According to the present invention, appropriate failure panel detection can be performed regardless of changes in solar radiation conditions.

1 is a block diagram of a photovoltaic power generator according to a first embodiment. 1 is a block diagram of a solar power generation unit according to a first embodiment. 1 is a block diagram of a management device according to a first exemplary embodiment; 3 is a graph illustrating an example of characteristics of the solar cell panel according to the first embodiment. It is the schematic which shows an example of the same tendency panel group in the solar power generation device concerning Embodiment 1. FIG. 3 is a flowchart illustrating an operation procedure of the management apparatus according to the first embodiment. 6 is a flowchart of a first grouping process performed by the management apparatus according to the first embodiment; 6 is a flowchart showing a procedure of second grouping processing of the management apparatus according to the first exemplary embodiment; 6 is a flowchart illustrating a procedure of a failure panel detection process of the management apparatus according to the first embodiment.

Embodiment 1
Hereinafter, embodiments will be described with reference to the drawings. Below, embodiment of this invention is described supposing a large-scale power generation facility among photovoltaic power generation devices. However, the present invention can also be applied to a small-scale household solar power generation device.

First, FIG. 1 shows a block diagram of a photovoltaic power generation apparatus 1 according to the first embodiment. As shown in FIG. 1, the photovoltaic power generation apparatus 1 according to the first embodiment includes power conditioners 101 to 10j (j is an integer indicating the number of power conditioners), panel units 111 to 11k (k is the number of panel units). The management device 20. In the example shown in FIG. 1, it is assumed that the same number of panel units 111 to 11k is provided for each power conditioner.

The power conditioners 101 to 10j add up the electric power generated by the corresponding panel units 111 to 11k and output them to the system wiring. Each of the panel units 111 to 11k has a string in which a plurality of solar battery panels are connected in series, and outputs electric power obtained from the string to the power conditioners 101 to 10j. Further, the panel units 111 to 11k output state information measured for each solar cell panel to the management device 20. The management apparatus 20 monitors a characteristic for every said solar cell panel with respect to the some string containing the some solar cell panel each connected in series. More specifically, the management device 20 detects a failure location of the solar cell panel based on the state information output from the panel units 111 to 11k. Hereinafter, each component will be described in more detail.

FIG. 2 shows a block diagram of the photovoltaic power generation unit according to the first embodiment. The configuration of the power conditioner 101 and the panel units 111 to 11k corresponding to the power conditioner 101, the power conditioners 102 to 10j, and the panel units 111 to 11k corresponding to these are substantially the same. Therefore, in FIG. 2, only the power conditioner 101 and the panel units 111 to 11k corresponding to the power conditioner 101 are shown.

As shown in FIG. 2, the solar power generation unit includes a power conditioner 101 and panel units 111 to 11k. The panel unit 111 includes solar cell panels P11 to P1m (m is an integer indicating the number of solar cell panels), a panel state measuring unit 121, and a connection box 131. The panel unit 112 includes solar cell panels P21 to P2m, a panel state measuring unit 122, and a connection box 132. The panel unit 11k includes solar cell panels Pk1 to Pkm, a panel state measuring unit 12k, and a connection box 13k. Since the panel units 111 to 11k have substantially the same configuration, the panel unit 111 will be described as an example.

Solar cell panels P11 to P1m constitute a string connected in series. Panel state measurement unit 121 acquires the output voltage and output current of each solar cell panel in units of panels by a monitor unit provided on the wiring connecting the solar cell panels. In addition, the panel state measurement unit 121 generates state information by associating the output voltage and output current with a panel ID that identifies the solar cell panel. The panel state measurement unit 121 outputs the generated state information to the management device 20. The connection box 131 outputs the electric power obtained from the string to the power conditioner 101 and prevents the current from flowing back from the other panel unit 11k.

FIG. 3 is a block diagram of the management apparatus 20 according to the first embodiment. As shown in FIG. 3, the management device 20 is a device capable of arithmetic processing, such as a computer. The management device 20 includes a processing unit 21, an operation unit 22, and a display unit 23. The processing unit 21 performs specific processing related to characteristic monitoring for each solar cell panel. The operation unit 22 is an interface through which a user gives an operation to the processing unit 21. The display unit 23 is an interface for presenting an operation screen of the processing unit 21 or a processing result to the user.

The processing unit 21 will be described more specifically. As illustrated in FIG. 3, the processing unit 21 includes a calculation unit 31, an input interface 32, and a storage unit 33. The arithmetic unit 31 performs arithmetic processing such as a CPU (Central Processing Unit), and executes a solar battery panel monitoring program (hereinafter referred to as a monitoring program) that performs specific processing of the present invention. The processing unit 21 includes processing functions such as a status information acquisition unit 311, a panel group setting unit 312, and a failure panel detection unit 313 by executing a monitoring program. The input interface 32 is a communication interface that acquires state information from the panel state measurement units 121 to 12 k and gives the state information to the calculation unit 31. The storage unit 33 stores data such as a monitoring program, individual panel status information, and panel group information.

The state information acquisition unit 311 acquires the state information of the solar cell panel for each solar cell panel via the input interface 32. And the status information acquisition part 311 produces | generates individual panel status information by matching status information with measurement time and the position of a solar cell panel. The status information acquisition unit 311 stores this individual panel status information in the storage unit 33.

The panel group setting unit 312 determines at least one reference solar cell panel from a plurality of solar cell panels, and bundles solar cell panels having state information in which a difference from the state information of the reference solar cell panel is within a predetermined range. The same tendency panel group is generated for each reference solar cell panel. Which solar cell panel is included in one same tendency panel group is stored in the storage unit 33 as panel group information. More specific processing of the panel group setting unit 312 will be described later.

The failure panel detection unit 313 detects, as a failure panel, a solar cell panel in which the time change of the state information is greater than a preset threshold among the solar cell panels belonging to the same group. When a failure panel is detected, the failure panel detection unit 313 stores the position information of the solar cell panel determined to be a failure panel in the storage unit 33 and displays it on the display unit 23. More specific processing of the failure panel detection unit 313 will be described later.

In the solar power generation device 1 according to the first exemplary embodiment, the solar cell panels are grouped based on the power generation amount for each solar cell panel and the time series information of the power generation tendency, and a failure of the solar cell panel is detected for each group. Therefore, a graph showing an example of the characteristics of the solar cell panel is shown in FIG. In the example shown in FIG. 4, the horizontal axis indicates time, and the vertical axis indicates voltage or current. Moreover, in the example shown in FIG. 4, the characteristic of the two solar cell panels which belong to one string was shown.

As shown in FIG. 4, the solar cell panel has a smaller variation in output voltage than the output current. Further, the output current of the solar cell panel greatly increases and decreases with time. This is because the amount of solar radiation changes with time. That is, the amount of power generated by the solar cell panel greatly depends on the magnitude of the output current. Therefore, in the solar power generation device 1 according to the first exemplary embodiment, the determination threshold value TH is provided for the output current, and a period in which the output current exceeds the determination threshold value TH is used as an effective power generation period.

Subsequently, the same tendency panel group in the photovoltaic power generation apparatus 1 according to the first embodiment will be described. The schematic of an example of the same tendency panel group of the solar power generation device 1 concerning Embodiment 1 is shown in FIG. The example shown in FIG. 5 has a panel unit of 4 rows and 3 columns, and further has a solar cell panel in which each panel unit is arranged in 5 rows and 5 columns. As shown in FIG. 5, in the solar power generation device 1 according to the first exemplary embodiment, the same tendency panel group is set according to the power generation tendency of the solar battery panel. Therefore, the solar panel belonging to the same tendency panel group is a panel unit. May exist beyond the boundaries of In the example shown in FIG. 5, PG1 to PG10 are shown as the same trend panel group.

Then, the operation | movement procedure of the management apparatus 20 of the solar power generation device 1 concerning Embodiment 1 is demonstrated concretely. The flowchart which shows the operation | movement procedure of the management apparatus 20 of the solar power generation device 1 concerning Embodiment 1 in FIG. 6 is shown.

As shown in FIG. 6, the management device 20 of the photovoltaic power generation apparatus 1 according to the first embodiment acquires state information from the panel state measurement units 121 to 12k and generates individual panel state information with the start of processing. (Step S1). The state information acquisition process in step S1 is a process performed in the state information acquisition unit 311. The state information acquisition unit 311 acquires the state information of the solar cell panel for each solar cell panel, generates information associating the state information with the measurement time and the position of the solar cell panel as individual panel state information, The individual panel state information is stored in the storage unit 33.

Subsequently, when there is an instruction to create the same trend panel group (YES in step S2), the management apparatus 20 creates the same trend panel group by the same trend panel group setting process in steps S3 and S4. On the other hand, when there is no instruction to create the same trend panel group (NO branch of step S2), the management device 20 does not create the same trend panel group, but performs a step based on the already set same trend panel group. The failure panel detection process of S5 is created. In addition, when the same tendency group has not been created by steps S2 and S3, the failure panel detection process is performed based on a preset temporary same tendency panel group. Further, there are various issuing methods such as issuing the same trend panel group creation instruction in step S2 by an operation by a user, or issuing periodically by a timer. That is, in the solar power generation device 1 according to the first exemplary embodiment, the panel group setting process in steps S3 and S4 is repeatedly executed according to preset conditions. Note that the panel group setting unit 312 performs the panel group setting process in steps S3 and S4.

Further, as shown in FIG. 6, the panel group setting process can be divided into a first grouping process (step S3) and a second grouping process (step S4). In the first grouping process, a correlation coefficient of state information between a reference solar battery panel selected from a plurality of solar battery panels and another solar battery panel is obtained, and the same trend panel group is generated based on the correlation coefficient. . In the second grouping process, solar cell panels that could not be included in any of the same trend panel groups in the first grouping process are included in any of the same trend panel groups. The panel group setting process in steps S3 and S4 is performed for each power conditioner, and is repeatedly performed until the processes for all power conditioners are completed. And in the solar power generation device 1 concerning Embodiment 1, in the failure panel detection process of step S5, a failure panel is detected by comparing the output of a solar cell panel within the same tendency panel group. This failure panel detection process is a process performed by the failure panel detection unit 313. Hereinafter, each process of steps S3 to S5 will be described in more detail.

First, FIG. 7 shows a flowchart showing the processing procedure of the first grouping process in step S3. As shown in FIG. 7, the first grouping process is performed for each type of solar cell panel specification. Therefore, in the first grouping process, the loop process is performed a number of times according to the number of types of solar cell panel specifications, and the processes of steps S11 to S18 are performed in each loop process. This process is performed in the panel group setting unit 312 of the management apparatus 20.

The panel group setting unit 312 registers the solar cell panels having the same specifications in the first temporary panel group PGP (step S11). Subsequently, the panel group setting unit 312 extracts, from the first temporary panel group PGP, a solar cell panel having the maximum power generation amount (hereinafter referred to as the maximum power generation panel MP) as a reference solar cell panel (step S12). Subsequently, the panel group setting unit 312 calculates the correlation coefficient of the panels in the first temporary panel group PGP (step S13).

For example, when the correlation coefficient K is a time series current value of the reference solar cell panel and Yi is a time series current value of the solar cell panel for which the correlation coefficient K is calculated, Equations (1) to (3) ) Is calculated based on the equation.

Subsequently, the panel group setting unit 312 determines whether there is a solar cell panel having a correlation coefficient K with the maximum power generation panel MP of 0.95 or more (step S14). In this step S14, when it is determined that there is a solar cell panel having a correlation coefficient K of 0.95 or more (YES branch of step S14), the solar cell panels having a correlation coefficient K of 0.95 or more are grouped. The same tendency panel group is generated (step S15). On the other hand, if it is determined in step S14 that there is no solar cell panel having a correlation coefficient K of 0.95 or more (NO branch of step S14), the maximum power generation panel MP is assigned to the second temporary panel group PGN. Register (step S16).

Subsequently, the panel group setting unit 312 determines whether there is a solar cell panel having a correlation K with the maximum power generation panel MP of less than 0.95 (step S17). In this step S17, when it is determined that there is a solar cell panel having a correlation coefficient K with the maximum power generation panel MP of less than 0.95 (YES branch of step S17), the correlation coefficient K is less than 0.95. The first temporary panel group PGP is reconfigured with the panel (step S18), and the process of step S12 is performed again. On the other hand, if it is determined in step S17 that there is no solar cell panel having a correlation coefficient K with the maximum power generation panel MP of less than 0.95 (NO branch of step S17), another loop process is not processed. If so, another loop process is performed, and if there is no unexecuted loop process, the first grouping process is terminated.

That is, in the first grouping process, one same tendency panel group is generated by bundling solar cell panels having a correlation coefficient with one reference solar cell panel within a predetermined range. In the first grouping process, a solar cell panel having the maximum power generation amount is determined as another reference solar cell panel from other solar cell panels that do not belong to the same tendency panel group, and another reference solar cell panel Another same tendency panel group is generated by bundling solar cell panels having state information whose difference from the state information is within a predetermined range.

Next, details of the second grouping process will be described. This second grouping process is also performed by the panel group setting unit 312. FIG. 8 is a flowchart showing the procedure of the second grouping process of the management apparatus according to the first embodiment. In addition, the solar cell panel which became unclassified in the 1st grouping process shall be judged as a failure panel with respect to an unclassified solar cell panel, assuming that the output characteristics are significantly different from other solar cell panels. You can also. In such a case, the second grouping process is not necessarily performed.

As shown in FIG. 8, the panel group setting unit 312 determines whether there is a solar cell panel registered in the second temporary panel group PGN with the start of the second grouping process (step). S21). In step S21, when it is determined that there is no solar cell panel registered in the second temporary panel group PGN (NO branch in step S21), the panel group setting unit 312 performs the second grouping process. finish. On the other hand, when it is determined in step S21 that there is a solar cell panel registered in the second temporary panel group PGN (YES branch in step S21), the panel group setting unit 312 determines that the second panel group PGN is present. Execute loop processing according to the number of panels registered in. This loop process includes the processes of steps S22 to S24.

The panel group setting unit 312 extracts a solar cell panel to be processed (hereinafter referred to as a processing target panel) from the second panel group PGN with the start of the loop processing. Subsequently, the panel group setting unit 312 calculates a correlation coefficient K between the processing target panel and the maximum power generation panel of the same trend panel group having the same specification for each maximum power generation panel (step S23). Subsequently, the panel group setting unit 312 registers the processing target panel in the same tendency panel group to which the maximum power generation panel having the largest correlation coefficient belongs. Then, the panel group setting unit 312 ends the second grouping process in response to the completion of the processes in steps S22 to S24 for all the solar battery panels registered in the second temporary panel group PGN. To do.

That is, in the second grouping process, a solar panel that does not belong to any of the same trend panel groups is included in the same trend panel group including the reference solar cell panel having the closest state information (the largest correlation coefficient K). Register with.

Next, the failure panel detection process will be described. The failure panel detection process is a process performed by the failure panel detection unit 313. FIG. 9 is a flowchart showing a procedure of failure panel detection processing of the management apparatus 20 according to the first embodiment.

As shown in FIG. 9, the failure panel detection unit 313 performs the processes of steps S31 to S36 for each tendency panel group. With the start of the failure panel detection process for one same tendency panel group, the failure panel detection unit 313 continuously outputs the output current for each of the solar panels in the same tendency panel group to be processed as the determination threshold TH or higher. A period is extracted (step S31). Subsequently, the failure panel detection unit 313 calculates a difference in power generation amount between the maximum power generation panel and another solar cell panel for each output continuous period (step S32).

Subsequently, the failure panel detection unit 313 verifies the magnitude of the difference in step S32 for each solar cell panel in the same trend panel group to be processed. In this verification process, first, it is determined whether or not the difference in power generation amount is equal to or greater than a failure threshold (step S33). If it is determined in step S33 that the difference in power generation amount is greater than or equal to the failure threshold (YES in step S33), the verified solar cell panel is registered as a failure panel (step S34). On the other hand, if it is determined in step S33 that the difference in power generation amount is less than the failure threshold (NO branch in step S33), it is determined whether or not the difference in power generation amount is greater than or equal to the output decrease threshold (step S35). ). If it is determined in step S35 that the difference in power generation amount is equal to or greater than the output decrease threshold (YES in step S35), the verified solar cell panel is registered as an output decrease panel (step S36). On the other hand, if it is determined in step S35 that the difference in power generation amount is less than the output decrease threshold (NO branch in step S35), it is determined that the verified solar cell panel is operating normally, Continue to verify battery panels.

That is, the failure panel detection unit 313 determines a solar cell panel in which the difference in power generation amount from the reference solar cell panel is equal to or greater than a first threshold (for example, a failure threshold) as a failure panel, and A solar battery panel in which the difference in power generation amount is equal to or greater than a second threshold (for example, output reduction threshold) that is smaller than the failure threshold is determined as an output reduction panel.

Then, the failure panel detection unit 313 identifies the same tendency panel group to be verified in response to performing the processing of steps S33 to S36 for all the solar cell panels included in the same tendency panel group to be verified. The same trend panel group. In addition, the failure panel detection unit 313 ends the processing for all the same trend panel groups in response to the end of the processing in steps S31 to S36.

From the above description, the solar power generation device 1 according to the first exemplary embodiment includes a plurality of failure detection targets in the first grouping process (for example, step S3) and the second grouping process (for example, step S4). A reference solar cell panel is selected from the solar cell panels. And the solar power generation device 1 sets the solar cell panel which has the status information in which the correlation coefficient K with the status information of a reference | standard solar cell panel is in a predetermined | prescribed range to one same tendency panel group. That is, the solar power generation device 1 can generate the same tendency panel group including solar cell panels having a high correlation regardless of the installation location and installation status of the panel unit.

That is, in the solar power generation device 1 according to the first exemplary embodiment, by performing the first grouping process, the solar term panels having the same power generation tendency are grouped according to the installation state of the solar battery panel or the sunshine condition. The And in the solar power generation device 1 concerning Embodiment 1, a failure panel can be detected with high precision by comparing the power generation amount relatively within the same tendency panel group.

Moreover, in the solar power generation device 1 according to the first exemplary embodiment, the grouping process is performed for each specification of the solar cell panel in the first grouping process. Here, the specification defines the power generation characteristics of the solar panel. If solar panels with different specifications are classified only by the power generation tendency, a slight environmental change (for example, the shadow caused by the flow of clouds). ), The amount of power generation becomes significantly different from that of other panels in the same group, and erroneous detection of a faulty panel may occur. However, such erroneous detection can be reduced by performing the grouping process for each specification of the solar cell panel.

Moreover, the solar power generation device 1 concerning Embodiment 1 registers the solar cell panel which has a high correlation in the same tendency panel group, and determines state information per solar cell panel. Therefore, the solar power generation device 1 can detect a decrease in output due to a change in installation environment. For example, it is possible to detect a decrease in the amount of power generated due to contamination of the solar cell panel. Since the dirt can be removed by cleaning, the output decrease period of the solar cell panel can be shortened by detecting the output decrease due to such a cause. For example, in a large-scale solar power generation device such as a mega solar, there is a large demand for increasing the power generation amount to the limit by managing the decrease in the power generation amount in units of panels, and in the unit of panels by the solar power generation device 1 The detection of output drop is important.

Moreover, in the solar power generation device 1 according to the first exemplary embodiment, by performing the second grouping process, all the solar battery panels belong to one of the same tendency panel groups. That is, in the photovoltaic power generation apparatus 1 according to the first embodiment, by performing the second grouping process, there is no solar cell panel on which the determination of whether or not there is a failure alone. Can be detected. For example, even if the installation state is such that only one solar panel is shaded, there is no solar panel that can be used to determine whether or not there is a failure. can do.

Moreover, the solar power generation device 1 concerning Embodiment 1 can reconfigure | reconfigure the solar cell panel contained in a reference | standard solar cell panel and the same tendency panel group according to a panel group creation instruction | indication. Thereby, even if it is a case where the time transition of the solar radiation amount of a solar cell panel changes, the solar power generation device 1 is the time of solar radiation amount for the same tendency panel group containing the solar cell panel which shows the same electric power generation amount change tendency. It can be generated in response to transition changes.

Moreover, since the photovoltaic power generation apparatus 1 according to the first embodiment generates the same tendency panel group as described above, the photovoltaic power generation apparatus 1 has a high correlation with the power generation tendency of the solar panel registered in the same tendency panel group. Therefore, the solar power generation device 1 can perform failure detection with high accuracy by comparing the power generation amount between the solar battery panels in the same tendency panel group. Moreover, since the failure detection with high accuracy can be performed, not only the failure of the solar battery panel but also the output decrease that is a sign of failure can be detected.

In the description of the above embodiment, the reference solar cell panel having the maximum power generation amount is selected from the first temporary panel group, and the solar cell panels having a high correlation coefficient with the reference solar cell panel are bundled to have the same tendency. An example of setting a panel group has been described. However, the method for determining the solar cell panel to be registered in the same trend panel group can take other methods.

For example, a waveform analysis used in speech recognition technology or the like is applied to a time series graph of power generation amount or a time series graph of output current amount, and a solar cell having a high similarity in power generation tendency using the analysis result A panel can be made into one same tendency panel group. A process such as Fourier transform is applied to the time series graph of the power generation amount or the time series graph of the output current amount, and a solar cell panel having a high similarity in power generation tendency according to the processing result is regarded as one same tendency panel group. You can also The shape of the time series graph of power generation amount or time series graph of output current amount is regarded as a figure, and a solar cell panel having a high similarity in power generation tendency according to the similarity of the figure is made into one same tendency panel group You can also. A power generation amount or output current amount integrated graph is generated as a time series graph of power generation amount or a time series graph of output current amount, and the similarity in power generation tendency is high according to the similarity of the slope of the integrated graph A solar panel can be made into one same tendency panel group.

In the above description, the hardware functions realized based on the monitoring program have been described. This monitoring program can be stored and supplied to a computer using various types of non-transitory computer-readable media. Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROM (Read Only Memory) CD-R, CD -R / W, including semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)). The program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

This application claims priority based on Japanese Patent Application No. 2013-023662 filed on Feb. 8, 2013, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation device 101-10j Power conditioner 111-11k Panel unit 20 Management apparatus 21 Processing part 22 Operation part 23 Display part 31 Calculation part 32 Input interface 33 Storage part 311 Status information acquisition part 312 Panel group setting part 313 Fault panel detection Part 121 to 12k Panel state measurement part 131 to 13k Connection box P11 to P1m, P21 to P2m, Pk1 to Pkm Solar panel PG1 to PG10 Same trend panel group

Claims

A solar cell panel monitoring program that is executed by a solar cell panel monitoring device having a calculation unit that executes a program and a storage unit that holds state information of the solar cell panel,
State information acquisition processing for acquiring the state information of the solar cell panel for each solar cell panel and storing the state information in the storage unit in association with the measurement time and the position of the solar cell panel;
At least one reference solar cell panel is determined from a plurality of the solar cell panels, and the solar cell panels having the state information whose difference from the state information of the reference solar cell panel is within a predetermined range are bundled. Panel group setting processing for generating the same trend panel group for each reference solar panel,
A failure panel detection process for detecting, as a failure panel, the solar cell panel in which the time change of the state information is greater than a preset threshold among the solar cell panels belonging to the same group,
A solar panel monitoring program.
The solar cell panel monitoring program according to claim 1, wherein the panel group setting process is repeatedly executed according to preset conditions.
The solar cell panel monitoring program according to claim 1 or 2, wherein the panel group setting process determines a solar cell panel having a maximum power generation amount among the plurality of solar cell panels as the reference solar cell panel.
The panel group setting process determines, as another reference solar cell panel, a solar cell panel having the maximum power generation amount from other solar cell panels not belonging to the same trend panel group,
4. The solar cell according to claim 3, wherein the solar cell panels having the status information whose difference from the status information of the other reference solar cell panel is within a predetermined range are bundled to generate another same tendency panel group. Panel monitoring program.
The said panel group setting process registers the solar cell panel which does not belong to any of the said same tendency panel group into the said same tendency panel group in which the reference | standard solar cell panel which has the said nearest state information is contained. Solar panel monitoring program.
The panel group setting process calculates a difference between the reference solar cell panel and the other solar cell panel based on a correlation coefficient between the state information of the reference solar cell panel and the state information of the other solar cell panel. The solar cell panel monitoring program according to any one of claims 1 to 5.
The solar panel monitoring program according to any one of claims 1 to 6, wherein the panel group setting process performs the same tendency panel group setting process for each specification of the plurality of solar panels.
The said failure panel detection process detects the said failure panel based on the electric power generation amount of the said solar cell panel in the output continuous period when the output current of the said solar cell panel becomes more than the preset determination threshold value. The solar cell panel monitoring program according to claim 1.
In the failure panel detection process, the solar cell panel in which the difference in the amount of power generation with the reference solar cell panel is equal to or greater than a first threshold is determined as the failure panel, and the power generation amount with the reference solar cell panel The solar cell panel monitoring program according to claim 8, wherein the solar cell panel in which the difference is equal to or greater than a second threshold value that is smaller than the first threshold value is determined as an output reduction panel.
A solar panel monitoring device that monitors characteristics of each solar cell panel with respect to a plurality of strings each including a plurality of solar cell panels connected in series,
A storage unit that holds state information measured for each solar cell panel in association with a measurement time and the position of the solar cell panel,
At least one reference solar cell panel is determined from a plurality of the solar cell panels, and the solar cell panels having the state information whose difference from the state information of the reference solar cell panel is within a predetermined range are bundled. A panel group setting unit that generates the same trend panel group for each reference solar panel;
A failure detection unit that detects the solar cell panel as a failure panel in which time change of the state information is greater than a preset threshold among the solar cell panels belonging to the same group;
A solar battery panel monitoring device.
The sun which performs the characteristic monitoring process for every said solar cell panel with respect to several string containing the several solar cell panel each connected in series using a solar cell panel monitoring apparatus provided with a calculating part and a memory | storage part A battery panel monitoring method comprising:
The state information measured for each solar cell panel is stored in the storage unit in association with the measurement time and the position of the solar cell panel,
The calculation unit analyzes the state information stored in the storage unit, determines at least one reference solar cell panel from the plurality of solar cell panels, and a difference from the state information of the reference solar cell panel is Bundling the solar cell panels having the state information within a predetermined range to generate the same trend panel group for each reference solar cell panel,
The arithmetic unit analyzes the state information for each group and detects the solar cell panel in which the time change of the state information is larger than a preset threshold among the solar cell panels belonging to the same group as a failure panel. To monitor solar panel.