JPWO2019163562A1 - Photovoltaic power generation failure judgment device, photovoltaic power generation failure judgment method, program, recording medium - Google Patents

Abstract

SOLUTION: An acquisition unit for acquiring various amount information indicating various amounts of electricity output from a solar cell, and a third for determining whether or not a value related to the various amounts of electricity shows a predetermined tendency with respect to a predetermined value. 1 determination unit, a calculation unit for calculating the time of the predetermined tendency or a time point showing the predetermined tendency, a determination result of the first determination unit, a calculation result of the calculation unit, a predetermined threshold value, and the like. A second determination unit for determining the state of the solar cell is provided based on the above. According to the present invention, it is possible to determine whether or not the solar cell is out of order with a simple configuration. [Selection diagram] Fig. 1

Description

The present invention relates to a photovoltaic power generation failure determination device, a photovoltaic power generation failure determination method, a program, and a recording medium.

For example, a system for detecting and classifying abnormalities in solar cells is known.

Japanese Unexamined Patent Publication No. 2012-156343

In Patent Document 1, the output voltage and output current of a solar cell during power generation are detected, and the detected voltage value / current value and the measurement data of the external environment measurement unit are used to perform numerical calculation and abnormality of the solar cell characteristic formula. A system is disclosed in which a threshold value for detecting a state is calculated, and the type of abnormal state of the solar cell is classified by using the calculation result of the characteristic formula and the threshold value.

However, this technique has a problem that the cost for installing the external environment measuring instrument increases because at least the external environment measuring instrument is required.

The main invention for solving the above-mentioned problems is an acquisition unit that acquires various amount information indicating various amounts of electricity output from the solar cell, and a value related to the various amounts of electricity shows a predetermined tendency with respect to a predetermined value. A first determination unit for determining whether or not, a calculation unit for calculating the time of the predetermined tendency or a time point showing the predetermined tendency, a determination result of the first determination unit, and a calculation result of the calculation unit. And a second determination unit that determines the state of the solar cell based on a predetermined threshold value.

Other features of the invention will become apparent with reference to the accompanying drawings and the description herein.

According to the present invention, it is possible to determine whether or not the solar cell is out of order with a simple configuration.

It is a figure which shows an example of the structure of a photovoltaic power generation system. It is a figure which conceptually shows the communication state between a string monitoring device and a management device. It is a figure which shows an example of the structure of the string monitoring apparatus. It is a figure which shows an example of the hardware composition of the 1st communication device. It is a figure which shows an example of the software structure of the 1st communication apparatus. It is a figure which shows an example of the hardware configuration of a management device. It is a figure which shows an example of the software structure of the 2nd communication device. It is a figure which shows an example of the voltage load situation when a string is normal. It is a figure which shows an example of the voltage load situation at the time of a string failure. It is a figure which shows another example of the voltage load situation at the time of a string failure. It is a figure which shows an example of the hardware composition of the photovoltaic power generation failure determination apparatus. It is a figure which shows an example of the software structure of the photovoltaic power generation failure determination apparatus. It is a table which shows an example of a string arrangement management table. It is a table which shows an example of the electric quantity table. It is a table which shows an example of the average electric quantity table. It is a table which shows an example of the rate of change table. It is a table which shows an example of a threshold value table. It is a table which shows an example of the count value table. It is a table which shows an example of a time ratio table. It is a flow chart which shows an example of the operation procedure of the photovoltaic power generation failure determination apparatus in this embodiment. It is a flow chart which shows an example of the operation procedure of the photovoltaic power generation failure determination apparatus in this embodiment.

The description of the present specification and the accompanying drawings will clarify at least the following matters. In addition, it should be noted
In FIGS. 1 to 19, the same items will be described with the same numbers.

=== Configuration of photovoltaic power generation system 100 ===
The photovoltaic power generation system 100 in which the photovoltaic power generation failure determination device 10 determines a failure will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram showing an example of the configuration of the photovoltaic power generation system 100. As shown in FIG.
The photovoltaic power generation system 100 is, for example, a power conditioner 110 (PCS: Power Co.
nditioning System), current collector box 120, junction box 121, and solar cell module 131.
, 132 string 130 and string monitoring device 140 (SSU: String)
Sensor Unit), management device 150 (MU: Management Unit), and network device 1
It is configured to include 60 (NW: Network Device).

The power conditioner 110 is a device that converts the electric power transmitted from the current collector box 120 from direct current to alternating current. The electric power output from the power conditioner 110 is supplied to the electric power system.

The current collector box 120 is a member to which a plurality of junction boxes 121 are electrically connected. Junction box 121
Is a member to which a plurality of strings 130 are electrically connected. The DC power transmitted from each string 130 is transmitted to the power conditioner 110 via the junction box 121 and the current collector box 120.

The string 130 is a unit of a solar cell module configured by connecting a plurality of solar cell modules 131 and 132 in series. In FIG. 1, the solar cell module 131 shows a solar module in which the string monitoring device 140 is installed, and the solar cell module 132 shows a solar module in which the string monitoring device 140 is not installed. Further, in FIGS. 1 to 20, for example, "1-1" attached to the string 130.
A number such as "-1" indicates a string ID which is an identifier that uniquely identifies each string 130. In the following, for example, the string 130 having the number "1-1-1" is referred to as "1-1-1 string 130". In addition, a plurality of strings 130 connected to the junction box 121 may be collectively referred to as all strings 130 and described.
The solar cell modules 131 and 132 are composed of a plurality of solar cell modules in which the light receiving surfaces are arranged in a plane facing upward and the surface side is protected by resin, tempered glass, or the like.

The string monitoring device 140 measures or calculates the current, voltage, or impedance (hereinafter, referred to as “electrical quantities”) of a predetermined string 130, and has a function of wirelessly communicating with another string monitoring device 140 and the management device 150. Has. As shown in FIG.
The string monitoring device 140 is connected between a plurality of solar cell modules connected in series. Thereby, the current flowing in the string 130 and the voltage in the string 130 can be measured. The first communication device 144 of the string monitoring device 140 transmits various quantity information indicating the measured electric quantities to the management device 150. The configuration of the string monitoring device 140 will be described in detail later.

The management device 150 is a device that transfers various quantity information received from the string monitoring device 140 to the photovoltaic power generation failure determination device 10 via the network device 160. Management device 150
The configuration of is described in detail later.

The management device 150 constitutes, for example, a multi-hop wireless communication network (hereinafter, referred to as “multi-hop network”) with the string monitoring device 140. In a multi-hop network, for example, radio waves in a frequency band such as 2.4 GHz band or 920 MHz band are used, and communication is performed in accordance with a wireless communication standard such as IEEE802.15.4. The optimum frequency band and wireless communication standard are appropriately selected according to the reach of radio waves, the distance between adjacent string monitoring devices 140, and the like. The connection form of the multi-hop network is not necessarily limited, for example, a tree type in which the string monitoring device 140 is hierarchically connected with the management device 150 as the root, and a star type in which a plurality of string monitoring devices 140 are directly connected to the management device 150. ..

FIG. 2 is a diagram conceptually showing the communication status between the string monitoring device 140 and the management device 150. As shown in FIG. 2, the management device 150 and the string monitoring device 140 have a management device ID and a string monitoring device ID, which are identifiers uniquely identified in the multi-hop network in order to construct the multi-hop network. It is given to each. The management device ID and the string monitoring device ID are, for example, physical addresses uniquely assigned to each, for example, a MAC address. The management device 150 and the string monitoring device 140 store the management device ID and the string monitoring device ID assigned to them, respectively.

Although the management device 150 and the string monitoring device 140 are described as wireless communication in the present embodiment, a network may be constructed by wired communication using a communication cable such as an optical cable.

The network device 160 is a device for connecting the management device 150 to the network 170. The network device 160 is a wired or wireless relay device, such as a switching hub or a router. The network 170 is, for example, the Internet or a dedicated line, and the photovoltaic power generation failure determination device 10 and the network device 160 are communicably connected via the network 170. The network device 160 may be, for example, a power plant monitoring device or a monitoring camera having a relay function.

In the above description, it has been described that the photovoltaic power generation failure determination device 10 is connected to the management device 150 via the network 170 and the network device 160, but the present invention is not limited to this. For example, the photovoltaic power generation system 100 may be configured such that the photovoltaic power generation failure determination device 10 receives various amounts of information directly from the management device 150 without going through the network 170 and the network device 160. In this case, the photovoltaic power generation failure determination device 10
For example, it is provided in the enclosure 180. Even in this case, the network is not limited to wireless communication, and may be constructed by a wired communication network using a communication cable such as an optical cable.

Hereinafter, the string monitoring device 140, the management device 150, and the photovoltaic power generation failure determination device 10 in the present embodiment will be described in detail.

== Configuration of string monitoring device 140 ==
The string monitoring device 140 will be described as follows with reference to FIGS. 3, 4, and 5.

FIG. 3 is a diagram showing an example of the configuration of the string monitoring device 140. As shown in FIG.
The string monitoring device 140 includes a voltage detector 141, a current detector 142, an AD converter 143, and a first communication device 144. The string monitoring device 140 is supplied with drive power from the current lines (positive side line and negative side line) of the string 130. The string monitoring device 140 may be provided with an emergency auxiliary power supply.

The voltage detector 141 is provided to measure, for example, the voltage value between the positive side line and the negative side line of the current line. The voltage detector 141 has, for example, a circuit that amplifies the measured voltage value (analog signal) and outputs it to the AD converter 143.

The current detector 142 has, for example, an element that detects a current flowing through a current line, and has a circuit that amplifies the detected current value (analog signal) and outputs it to the AD converter 143.

The AD converter 143 is a device that converts an analog signal indicating various amounts of electricity (voltage value, current value) input from each of the voltage detector 141 and the current detector 142 into a digital signal and outputs the analog signal to the first communication device 144. Is.

The first communication device 144 is a device for communicating with the management device 150 and other string monitoring devices 140 via a multi-hop network. FIG. 4 is a diagram showing an example of the hardware configuration of the first communication device 144. As shown in FIG. 4, the hardware of the first communication device 144 includes a processor 1441, a memory 1442, a timing device 1443, and a communication circuit 14.
44 and. The processor 1441 is, for example, an MPU (Micro Process i).
ng Unit), CPU (Central Processing Unit), etc. The memory 1442 includes, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), and an NVRAM (Non Vo).
latile RAM) and so on. The processor 1441 and the memory 1442 are the first communication device 1.
44 has a role to function as an information processing device. Programs and data such as firmware are stored in the memory 1442. The timekeeping device 1443 is, for example, RTC (
It is configured using Real Time Clock) and outputs time information. The communication circuit 1444
For example, it includes a high-frequency amplifier circuit, a modulation / demodulation circuit (frequency conversion circuit, filter circuit, oscillation circuit, orthogonal demodulation circuit, orthogonal modulation circuit, etc.), an AD converter, a DA converter, and the like.

FIG. 5 is a diagram showing an example of the software configuration of the first communication device 144. As shown in FIG. 5, the software of the first communication device 144 can realize the functions of the multi-hop communication unit 144a and the various quantity information transmission unit 144b. These functions are, for example, the first communication device 144.
This is realized by the processor 1441 of the above reading and executing the program stored in the memory 1442. Note that these functions may be realized by hardware such as ASIC.

The multi-hop communication unit 144a is a function for communicating with other string monitoring devices 140 and management devices 150 via a multi-hop network. The multi-hop communication unit 144a includes, for example, a route control function, an access control function, a channel estimation / allocation function, an error control function, a flow control function, a congestion control function, a QoS management function, and the like for performing communication. When the multi-hop communication unit 144a receives a packet of a destination other than itself via the multi-hop network, for example, the route control function selects a route, and the received packet is selected by another string monitoring device 140 on the selected route. And has a function of transferring to the management device 150.

The quantity information transmission unit 144b is a function for transmitting the electrical quantities input from the AD converter 143 as quantity information to the management device 150 via the multi-hop network.
The quantity information transmission unit 144b transmits the quantity information to the management device 150 at predetermined time intervals (for example, every 60 seconds).

== Configuration of management device 150 ==
The management device 150 will be described as follows with reference to FIGS. 6 and 7.

FIG. 6 is a diagram showing an example of the hardware configuration of the management device 150. As shown in FIG. 6, the management device 150 is configured to include the second communication device 151. Second communication device 151
Has an interface such as a wireless LAN adapter or a NIC for connecting to the network 170, and is connected to the network 170 via the network device 160.
The second communication device 151 communicates with the string monitoring device 140 via the multi-hop network.

As shown in FIG. 6, the hardware of the second communication device 151 includes a processor 1511, a memory 1512, a timing device 1513, and a communication circuit 1514. Since each component is the same as that of the first communication device 144, the description thereof will be omitted.

FIG. 7 is a diagram showing an example of the software configuration of the second communication device 151. As shown in FIG. 7, the software of the second communication device 151 can realize the functions of the multi-hop communication unit 151a and the determination device transmission unit 151b. These functions are, for example, the second communication device 151.
This is realized by the processor 1511 of the above reading and executing the program stored in the memory 1512. Note that these functions may be realized by hardware such as ASIC.

The multi-hop communication unit 151a is a function for communicating with the string monitoring device 140 via the multi-hop network. The multi-hop communication unit 151a includes, for example, a route control function, an access control function, a channel estimation / allocation function, an error control function, a flow control function, a congestion control function, a QoS management function, and the like for performing communication. The determination device transmission unit 151b is a function for communicating with the photovoltaic power generation failure determination device 10 via the network device 160.

== Configuration of photovoltaic power generation failure determination device 10 ==
The configuration of the photovoltaic power generation failure determination device 10 will be described as follows with reference to FIGS. 8 to 19.

The photovoltaic power generation failure determination device 10 is a string 130 in the photovoltaic power generation system 100.
String 130 due to failure, deterioration of power generation due to deterioration over time or adhesion of dirt, or the influence of shadows
It is a device that determines the state of a predetermined string 130 by utilizing the phenomenon that various amounts of electricity output from the device fluctuate.

The string 130 includes a solar cell module 131 in which the string monitoring device 140 is installed, a solar cell module 132 in which the string monitoring device 140 is not installed, and the string 130.
Is configured to include. Here, the outline of the voltage fluctuation of the string 130 when the string 130 fails will be described with reference to FIGS. 8 to 10. String 1 as shown in FIG.
If 30 is not out of order, the voltage of the solar cell module 131 and the solar cell module 13
It shows substantially the same voltage value as the voltage of 2. On the other hand, when the solar cell module 131 of the string 130 fails as shown in FIG. 9, the voltage of the solar cell module 131 is, for example, "0V".
Shows a voltage value close to or close to it. That is, the string monitoring device 140 transmits "0V" or a voltage value close to it to the management device as various quantity information. Further, when the solar cell module 132 fails as shown in FIG. 10, the voltage component of the solar cell module 132 is shared by the other solar cell module 132 and the solar cell module 131. That is, the string monitoring device 140 transmits the voltage value obtained by adding the voltage component of the failed solar cell module 132 to the voltage component shared before the failure to the management device 150 as various amount information. In this way, the photovoltaic power generation failure determination device 10 determines the failure state of the string 130 by capturing the phenomenon that the various amounts of electricity measured by the string monitoring device 140 change when the solar cell modules 131 and 132 fail. To do. In the following, the voltage value of the solar cell module 131 measured by the string monitoring device 140 will be referred to as a module voltage value.

Further, the photovoltaic power generation failure determination device 10 catches the phenomenon that the current value measured by the string monitoring device 140 becomes small, and determines the power generation reduction state and the state affected by the shadow in the string 130. In the following, the value of the current measured by the string monitoring device 140 will be referred to as a string current value.

In the following, the photovoltaic power generation failure determination device 10 is a plurality of solar cell modules 131, 1.
Although it is explained that the failure determination is performed in units of strings consisting of 32, the present invention is not limited to this. For example, the failure determination may be performed for each solar cell module constituting the string 130, or for each junction box, current collector box, or power conditioner. In this case, the description of the string 130 in the following description is described in the solar cell module 131,
It shall be applied in place of 132, the junction box 121, the current collector box 120 or the power conditioner 110.

FIG. 11 is a diagram showing an example of the hardware configuration of the photovoltaic power generation failure determination device 10. As shown in FIG. 11, the hardware of the photovoltaic power generation failure determination device 10 includes the processor 11 and
The memory 12, the storage device 13, the input device 14, the output device 15, and the third communication device 16 are included. The processor 11 is, for example, an MPU, a CPU, or the like. The memory 12 is, for example, a RAM, a ROM, an NVRAM, or the like. The storage device 13 is, for example, a RAM, a ROM, an NVRAM, or the like. The input device 14 is a user interface that receives operation input from the user, and is, for example, an operation input device (keyboard, mouse, touch panel, etc.), a voice input device (microphone, etc.), and the like. The output device 15 is a user interface that provides various information to the user, and is, for example, a display device (liquid crystal monitor, etc.).
, Audio output device (speaker, etc.), etc. The third communication device 16 is an interface for connecting to the network 170, for example, a wireless LAN adapter and a NIC (Network).
Interface Card) and so on.

FIG. 12 is a diagram showing an example of the software configuration of the photovoltaic power generation failure determination device 10. As shown in FIG. 12, the software of the photovoltaic power generation failure determination device 10 includes an acquisition unit 10a, an average value calculation unit 10b, a change rate calculation unit 10c, a first determination unit 10d, and a time calculation unit 10e. It has the functions of a time ratio calculation unit 10f, a second determination unit 10g, and a failure determination unit 10h. For these functions, for example, the processor 11 of the photovoltaic power generation failure determination device 10 has the memory 12
It is realized by reading and executing the program stored in. In addition, these functions may be realized by hardware such as ASIC. Further, the processor 11 may be realized by reading and executing a program stored in an external storage medium.

Note that FIG. 12 shows that the photovoltaic power generation failure determination device 10 realizes each function with one information processing device (computer), but the present invention is not limited to this. For example, each of the above-mentioned functions may be distributed and realized by two or more information processing devices. In the following, as an example, each function will be realized by one information processing device.

The photovoltaic power generation failure determination device 10 stores various amount information input via the third communication device 16, various information calculated by each of the above-mentioned functions, and various information input from an external device (not shown). Has a function to record in.

Specifically, the storage device 13 includes a string arrangement management table 10i showing an example in which the string ID as shown in FIG. 13 and the physical address (for example, MAC address) of the string monitoring device 140 are associated with each other. An electrical quantity table 10j showing an example in which the string ID as shown in FIG. 14 and the quantity information of each string 130 are associated with each other, and a time ID and an average electrical quantity indicating the time as shown in FIG. 10k, an average electrical quantity table showing an example in which is associated with, and a change rate table 10L showing an example in which the time ID, string ID, and each rate of change are associated as shown in FIG. The threshold table 10m showing an example in which the threshold ID and the threshold are associated with each other as shown, and the time ID and string I as shown in FIG.
A count value table 10n showing an example in which D and each count value are associated with each other, and a time ratio table showing an example in which the string ID, the current abnormal time ratio, and the voltage abnormal time ratio as shown in FIG. 19 are associated with each other. 10p and are stored.

Hereinafter, each function of the photovoltaic power generation failure determination device 10 will be described in detail.

The acquisition unit 10a is a function of acquiring various quantity information indicating various electrical quantities output from the string 130 via the management device 150. Further, when it is necessary to access a publicly available database such as the Japan Meteorological Agency database 200, it has a function of acquiring predetermined information from the database.

The average value calculation unit 10b is a function of calculating the string average electric quantity value indicating the average of the electric quantities output from each of all the strings 130 at a predetermined time. The string average electric quantity values include, for example, a string average current value indicating an average of current values and a string average voltage value indicating an average of voltage values. The average value calculation unit 10b may have a function of calculating the median value of each module voltage value or string current value of all strings 130, in addition to the function of calculating the string average electric quantity value. .. In the following description, it will be described that the average value calculation unit 10b calculates the string average electric amount value and realizes other functions by using the string average electric amount value. Instead, the median may be used to implement other functions.

At a predetermined time, the rate of change calculation unit 10c divides the electrical quantity values in the predetermined string 130 by the string average quantity values based on the string ID and various information associated with the time ID to obtain the rate of change. It is a function to calculate. The rate of change includes a current rate of change calculated by dividing the string current value by the string average current value and a voltage change rate calculated by dividing the module voltage value by the module average voltage value. Change rate calculation unit 10c
With the function of, the current value or voltage value of a predetermined string 130 can be converted into a relative value in relation to the current value or voltage value of all strings 130, so that the determination accuracy can be improved.

The first determination unit 10d is a function of comparing the rate of change with a predetermined determination threshold value. The determination threshold value includes a current abnormality determination threshold value to be compared with the current change rate and a voltage abnormality determination threshold value to be compared with the voltage change rate. The determination threshold value is not limited to a predetermined value, and the determination threshold value may be arbitrarily set.

The time calculation unit 10e is a function of calculating the time of each of the states where there is a possibility of failure or the state where there is no possibility of failure based on the comparison result between the rate of change and the determination threshold value. To give a specific example, when the first determination unit 10d determines that the current change rate is larger than the current abnormality determination threshold value, the time calculation unit 10e quantifies the state in which there is a possibility of failure. Add a predetermined value to the value. When the first determination unit 10d determines that the current change rate is equal to or less than the current abnormality determination threshold value, a predetermined value is added to the current normal count value that quantifies the state in which there is no possibility of failure. For the voltage change rate, a predetermined value is added to the voltage failure count value and a predetermined value is added to the voltage normal count value under the same conditions. Here, the predetermined value is a value corresponding to the data sample time interval, and for example, "10" is set when the above-mentioned determination is performed every 10 minutes.
The time calculation unit 10e stores each count value in the storage device in association with the string ID and the time ID.

The time ratio calculation unit 10f is a function of calculating the ratio of each count value calculated by the time calculation unit 10e to a predetermined period. This ratio includes the current abnormal time ratio to the current failure count value, the current normal time ratio to the current normal count value, the voltage abnormal time ratio to the voltage failure count value, and the voltage normal time ratio to the voltage normal count value. included. In the following, the state determination will be performed using the current abnormal time ratio and the voltage abnormal time ratio, but the state determination may be executed using the current normal time ratio and the voltage normal time ratio.

To give a specific example, when the predetermined time is 600 minutes (10 hours) from 8:00 to 18:00 and the current failure count value is "300", the current abnormal time ratio is calculated to be 50%. ..
Similarly, when the predetermined time is 600 minutes and the voltage failure count value is "240", the voltage abnormality time ratio is calculated to be 40%.

The second determination unit 10g is a function of comparing either one of the voltage abnormal time ratio and the current abnormal time ratio with a predetermined threshold value. The second determination unit 10g transmits the comparison result to the failure determination unit 10h. With this function, it is possible to determine the continuation state of the relative magnitude (rate of change) of the electric quantity values in the predetermined string 130 with respect to the string average quantity values. In this way, by making a judgment using the condition related to time, it is possible to avoid judging that the decrease in the amount of electricity due to the influence of the shadow is a failure.

The failure determination unit 10h is a predetermined string 130 based on the comparison result of the second determination unit 10g.
It is a function to judge the state of.

Instead of the rate of change calculated by the function of the rate of change calculation unit 10c described above, the current abnormal time ratio or the voltage abnormal time ratio may be calculated by using the current value or the voltage value as it is.

Further, the photovoltaic power generation failure determination device 10 may further include a solar radiation stability determination unit (not shown). The solar radiation stability determination unit is a function of determining whether or not the string average current value is larger than the solar radiation stable current value, which is a predetermined constant. As a result, it is possible to determine the failure in a situation where the solar radiation is stable. The same value may be set for the solar radiation stable current value throughout the day, or a different value may be set for each predetermined time of the day.

In addition, the photovoltaic power generation failure determination device 10 acquires weather information from, for example, a database of the Japan Meteorological Agency (not shown) and extracts various amounts of electricity at a sunny time to determine a failure in a situation where sunlight is stable. It may be configured to be executable.

== Judgment procedure of photovoltaic power generation failure judgment device 10 ==
An example of the state determination flow of the photovoltaic power generation failure determination device 10 will be described below with reference to FIGS. 20A and 20B. 20A and 20B show the photovoltaic power generation failure determination device 10.
It is a flow chart which shows an example of the state determination procedure of. In the following description, when each function is the subject, it means that the processor 11 reads the program and realizes a predetermined function.

In the photovoltaic power generation failure determination device 10, when the state of the predetermined string 130 changes, the electric quantity values of the predetermined string 130 become larger or smaller than the electric quantity values indicated by the other strings 130. Take advantage of the phenomenon of breakdown. Hereinafter, the determination procedure of the photovoltaic power generation failure determination device 10 will be specifically described.

The photovoltaic power generation failure determination device 10 repeatedly executes the following processes S11 to S31 for all strings (S10). In the following, as an example, a predetermined string 130 for identifying a failure will be described as a 1-1-1 string 130.

First, the acquisition unit 10a acquires the quantity information output from the 1-1-1 string 130 via the management device 150, and stores the quantity information in the storage device 13 in association with the string ID.

Next, the average value calculation unit 10b calculates the string average current value of all the strings 130 connected to the junction box 121 at a predetermined time (for example, between 8:00 and 18:00) (S).
12). Further, the string average voltage value of all the strings 130 is calculated (S13).
..

Specifically, the mean value calculation unit 10b sums all the electric quantity values at a predetermined date and time associated with each of the string IDs shown in FIG. The string average current value and the string average voltage value are calculated by dividing the total by the number of all strings 130. The average value calculation unit 10b stores the calculated string average current value and string average voltage value in the storage device 13 in association with the time ID.

Next, the rate of change calculation unit 10c calculates the rate of change in the current by dividing the string current value of the 1-1-1 string 130 by the string average current value as a percentage (S14).
That is, the current change rate is obtained by converting the string current value into a value relative to the string average current value. This makes it possible to determine the state by making a relative comparison of various amounts of electricity. Similarly, the voltage change rate is calculated by dividing the module voltage value by the module average voltage value (S18).

Next, the first determination unit 10d compares the current change rate with the predetermined current abnormality determination threshold value (S15). Then, when the time calculation unit 10e determines that the current change rate is larger than the current abnormality determination threshold value (S15: YES), the time calculation unit 10e adds a predetermined value to the current failure count value (S).
16). Further, when the time calculation unit 10e determines that the current change rate is equal to or less than the current abnormality determination threshold value (S15: NO), the time calculation unit 10e adds a predetermined value to the current normal count value (S17).

Next, the first determination unit 10d compares the voltage change rate with the predetermined voltage abnormality determination threshold value (S19). Similarly to the above, when the voltage change rate is determined to be larger than the voltage abnormality determination threshold value (S19: YES), the time calculation unit 10e adds a predetermined value to the voltage failure count value (S20). Further, when the voltage change rate is determined to be equal to or lower than the voltage abnormality determination threshold value (S19: NO), the time calculation unit 10e adds a predetermined value to the voltage normal count value (S21).

As a result, it is possible to know a value obtained by integrating the time indicating a state in which it can be determined that there is no failure (a state indicating a normal value) and a value obtained by integrating the time indicating a state in which a failure is possible. In other words,
It can be seen what kind of tendency the current change rate and the voltage change rate show with respect to a predetermined threshold value.
In the following description, the integrated value of the time indicating each state is referred to as the integrated time.

The above-mentioned processing from S12 to S21 is performed during the period from sunrise to sunset (for example, 8:00 to 18).
When) Repeat. As a result, in the period from sunrise to sunset, the accumulated time indicating the state at which there is a possibility of failure can be known.

Here, the processing of the first determination unit 10d and the time calculation unit 10e described above will be specifically described below, for example, assuming that the data sample time interval is 10 minutes.

The first determination unit 10d has a current change rate “91%” at 12:00 shown in FIG. 16 and a current abnormality determination threshold value (for example, threshold value ID “1”) “90 associated with the threshold value ID shown in FIG.
In this case, since the current change rate (91%) is larger than the current abnormality determination threshold value (90%), the time calculation unit 10e adds "10" minutes to the current normal count value. As shown in FIG. 18, the current normal count value is stored in the storage device 13 for each string, whereby the integrated time indicating the normal state of the 1-1-1 string 130 can be known.

Further, the first determination unit 10d has a current change rate of “80%” at 14:00 shown in FIG.
And the current abnormality determination threshold value (for example, threshold value ID “1”) associated with the threshold value ID shown in FIG.
Compare with "90%". In this case, the current change rate (80%) is the current abnormality determination threshold value (90).
%) Or less, so the time calculation unit 10e adds "10" minutes to the current abnormality count value. As a result, the integrated time indicating the state in which the 1-1-1 string 130 may fail can be known.

The process of calculating the voltage normal count value and the voltage abnormality count value (for example, the threshold ID “2”) from the relationship between the voltage change rate and the voltage abnormality determination threshold is the current from the relationship between the current change rate and the current abnormality determination threshold. Since it is the same as the above-described process for calculating the normal count value and the current abnormality count value, the description thereof will be omitted. However, in the process of calculating the voltage normal count value and the voltage abnormality count value, a value exceeding 100% such as “105%” may be adopted as the voltage abnormality determination threshold value. This is because the 1-1-1 string 130 may have failed even when the module voltage value shows a value larger than the module average voltage value (FIG. 10).
reference). In this case, in S19, if the voltage change rate (for example, 115%) is larger than the voltage abnormality determination threshold value (105%), "10" is added to the voltage abnormality count value, and the voltage change rate (for example)
For example, if 103%) is equal to or less than the voltage abnormality judgment threshold value (105%), the voltage normal count value is set to ".
Add 10 "minutes.

Proceed to S22 and use the current failure count value and voltage failure count value to 1-1.
The process of determining the state of the -1 string 130 will be described below.

The time ratio calculation unit 10f calculates the ratio of the time during which the 1-1-1 string 130 may be out of order to the period from sunrise to sunset. Specifically, the time ratio calculation unit 10f divides the current failure count value by the check period (for example, the period from 8:00 to 18:00) to calculate the current abnormal time ratio (S22). Further, the time ratio calculation unit 10f divides the voltage failure count value by the check period to calculate the voltage abnormal time ratio (S23).

Specifically, the processing of the time ratio calculation unit 10f is described. After the check period ends (for example, 18:10), the current failure count value “420” shown in FIG. 18 is set to the check period “60”.
The value divided by 0 "minutes is indicated as a percentage to calculate the current abnormal time ratio" 70 "%. Similarly, the voltage failure count value" 360 "minutes at 18:00 shown in FIG. 18 is checked for the check period" 600 ". The value divided by "minutes" is indicated as a percentage to calculate the voltage abnormal time ratio "60"%.

Next, the second determination unit 10g determines the voltage abnormal time ratio, the current abnormal time ratio, and the predetermined first.
-Compare with the third threshold (S24, S27, S29). Then, the failure determination unit 10h determines the state of the 1-1-1 string 130 based on the determination result by the second determination unit 10g (S25, S26, S28, S30, S31). Hereinafter, a specific description will be given.

First, in the processing of the second determination unit 10g and the failure determination unit 10h, a procedure for determining that the 1-1-1 string 130 is in a failure state will be described.

The second determination unit 10g compares the voltage abnormal time ratio “V1” shown in FIG. 19 with the first threshold value (for example, threshold value ID “3”) “90%” shown in FIG.

When the voltage abnormal time ratio is smaller than the first threshold value (S24: NO), the module voltage value of the 1-1-1 string 130 is relatively higher than the module average voltage value of all strings 130 in the second determination unit 10g. 1-1-1 string 130 because the situation is not small
Determines that there is no failure, and shifts the process to S27.

On the other hand, when the voltage abnormal time ratio is equal to or higher than the first threshold value (S24: YES), the second determination unit 1
0g is 1- because the module voltage value of 1-1-1 string 130 is too small or too large (see FIG. 10) than the module average voltage value of all strings 130 (see FIG. 10). 1-1 It is determined that the string 130 may have failed, and the process is shifted to S25.

Then, the failure determination unit 10h determines whether or not the power generation reduction flag described later is in the ON state on the past day (S25). If the power generation reduction flag is already in the ON state on the past day (S25: YES), it is determined that the 1-1-1 string 130 has not failed, and the process is shifted. On the other hand, when the power generation reduction flag is not in the ON state on the past day (S2).
5: NO), 1-1-1 string 130 is determined to be out of order, and the process shifts to S26. The failure determination unit 10h shifts the process by turning on the failure flag indicating the failure state (S26).

In this way, in the failure determination unit 10h, when the power generation reduction flag has already been turned on in the past day, the power generation of the 1-1-1 string 130 is reduced due to aged deterioration or dirt adhesion. It is determined that a certain condition is given priority over the state of failure.

However, in the second determination unit 10g, for example, when the voltage abnormality time ratio is equal to or higher than the first threshold value (
S24: YES), it may be determined that the product is in a failed state without going through the processing of S25.

Next, in the processing of the second determination unit 10g and the failure determination unit 10h, a procedure for determining that the 1-1-1 string 130 is in a state in which the power generation is reduced due to aged deterioration or the like will be described.

In the second determination unit 10g, when the voltage abnormality time ratio is smaller than the first threshold value (S24: NO).
, The current abnormal time ratio “A1” shown in FIG. 19 and the second threshold value (for example, threshold ID “” shown in FIG.
4 ”)“ 90% ”and is compared (S27).

When the current abnormal time ratio is smaller than the second threshold value (S27: NO), the second determination unit 10g is in a situation where the string current value of the 1-1-1 string 130 is not smaller than the string average current value of all strings 130. , Therefore, it is determined that the 1-1-1 string 130 has not failed and that the power generation has not decreased due to aged deterioration or the like, and the process is shifted to S29.

On the other hand, when the current abnormal time ratio is equal to or higher than the second threshold value (S27: YES), the second determination unit 1
For 0 g, since the string current value continues to be too small than the string average current value, it is determined that the 1-1-1 string 130 is in a state in which power generation is reduced due to aged deterioration or the like, and processing is performed. Move to S28.

Then, when it is determined that the power generation of the 1-1-1 string 130 is in a reduced state, the failure determination unit 10h turns on the power generation reduction flag indicating that the power generation is in a reduced state.
And shift the process (S28).

As described above, the failure determination unit 10h determines that the power generation is reduced in the state where the module voltage value of the 1-1-1 string 130 is normal and only the string current value is reduced. judge. That is, the failure determination unit 10h determines a phenomenon in which the change in the module voltage value is small and the change in the string current value is large when the solar cell module 131 has deteriorated over time.

Next, in the processing of the second determination unit 10g and the failure determination unit 10h, a procedure for determining that the 1-1-1 string 130 is in a shaded state will be described.

In the second determination unit 10g, when the current abnormal time ratio is smaller than the second threshold value (S27: NO).
, The current abnormal time ratio “A1” shown in FIG. 19 and the second threshold value (for example, threshold ID “” shown in FIG.
4 ")" 90% "and a third threshold (eg, threshold D" 5 ")" 30% "are compared (S).
29).

When the current abnormal time ratio is equal to or less than the second threshold value and is equal to or greater than the third threshold value (S29: Y).
ES), the second determination unit 10g determines that the situation where the string current value of the 1-1-1 string 130 is smaller than the string average current value of all the strings 130 is experienced for a predetermined time. In this case, the second determination unit 10g is in a state in which the 1-1-1 string 130 is not in a failed state and the power generation is not reduced due to aged deterioration or the like, and the string current value is temporarily lowered. Is determined to be. The second determination unit 10g determines that this state is due to the influence of the shadow, and shifts the process to S30.

When the current abnormal time ratio is smaller than the third threshold value (S29: NO), the second determination unit 10g has a situation where the string current value of the 1-1-1 string 130 is smaller than the string average current value of all strings 130. Since it continues, it is determined that the 1-1-1 string 130 is normal, and the process shifts to S31.

Then, when it is determined that the string current value of the 1-1-1 string 130 is temporarily lowered due to the influence of a shadow or the like, the failure determination unit 10h turns on the shadow flag and shifts the process (S30). ). Further, when the failure determination unit 10h determines that the 1-1-1 string 130 is normal, the failure determination unit 10h turns on the normal flag and shifts the process (S31).

As described above, the above processes S11 to S31 are repeatedly executed for all strings (S10).

By executing the above-mentioned process, the cause of the change in the module voltage value and the string current value is temporarily affected by the shadow, whether the predetermined string 130 is out of order or the power generation is reduced. Whether or not it is present can be determined easily and appropriately.

=== Summary ===
As described above, the acquisition unit 10a for acquiring various amount information indicating the various amounts of electricity output from the solar cell, and the second determination of whether or not the various amounts of electricity show a predetermined tendency with respect to a predetermined value. 1 determination unit 10d, a calculation unit (average value calculation unit 10b, change rate calculation unit 10c, time calculation unit 10e) for calculating a time when a predetermined tendency occurs or a time point showing a predetermined tendency, and a first determination unit 10d. The determination result, the calculation result of the calculation unit (average value calculation unit 10b, change rate calculation unit 10c, time calculation unit 10e), and predetermined threshold values (current abnormality determination threshold value, voltage abnormality determination threshold value, first threshold value, second threshold value). , A third threshold value), and a second determination unit 10g for determining the state of the solar cell based on. According to this embodiment, it is possible to determine whether or not the string 130 is out of order by a simple configuration without using an external device such as an external environment measuring instrument.

Further, the average value calculation unit 10b in the photovoltaic power generation failure determination device 10 according to the present embodiment is
The average electric amount indicating the average of the electric amounts output from each of the plurality of strings 130 is calculated, and the ratio of the electric amounts output from the predetermined string 130 among the plurality of strings 130 to the average electric amount. The first determination unit 10d calculates the various quantity change rate indicating the above, and the first determination unit 10d cannot normally output the electric quantity by the predetermined string 130 based on the magnitude relationship between the various quantity change rate and the predetermined value. It is determined whether or not a predetermined tendency indicating that is shown. According to the present embodiment, the current value or voltage value of a predetermined string 130 can be converted into a relative value in relation to the current value or voltage value of all strings 130, so that the determination accuracy can be improved.

Further, in the photovoltaic power generation failure determination device 10 according to the present embodiment, the first determination unit 10d is
Based on the magnitude relationship between the voltage change rate and the predetermined threshold value, it is determined whether or not the predetermined string 130 shows a predetermined tendency indicating that the electric quantities cannot be output normally, and the time ratio calculation unit 1
0f calculates the voltage abnormality time ratio, and when the second determination unit 10g determines that the voltage abnormality time ratio is equal to or higher than the first threshold value, the second determination unit 130 determines that the predetermined string 130 is in a failure state. According to this embodiment, for example, a situation in which the voltage is too large or too small for a certain period of time from sunrise to sunset is captured, and a failure situation as shown in FIG. 9 or 10 is easily determined. can do.

Further, in the photovoltaic power generation failure determination device 10 according to the present embodiment, the first determination unit 10d is
Whether or not the predetermined string 130 shows a predetermined tendency indicating that the electric quantities cannot be output normally based on the magnitude relationship between at least one of the voltage change rate or the current change rate and the predetermined threshold value. The time ratio calculation unit calculates the voltage abnormal time ratio, calculates the current abnormal time ratio, and the second determination unit 10g determines that the voltage abnormal time ratio is smaller than the first threshold value. When it is determined that the abnormal time ratio is equal to or higher than the second threshold value, the predetermined string 130
Is determined to be in a low power generation state. According to the present embodiment, it can be easily determined that the string 130 is not out of order, but that the power generation is reduced due to the influence of aging deterioration, dirt, and the like. As a result, it can be easily determined that the situation does not require human response immediately, and unnecessary confirmation work can be suppressed, so that human cost can be suppressed.

Further, in the photovoltaic power generation failure determination device 10 according to the present embodiment, the second determination unit 10g is
When it is determined that the voltage abnormal time ratio is equal to or higher than the first threshold value, and when it is determined that the current abnormal time ratio is equal to or higher than the second threshold value at a predetermined time point prior to the determination time, the predetermined string 130 Is determined to be in a low power generation state. As a result, it can be easily determined that the situation does not require human response immediately, and unnecessary confirmation work can be suppressed, so that human cost can be suppressed.

Further, in the photovoltaic power generation failure determination device 10 according to the present embodiment, the first determination unit 10d is
Whether or not the predetermined string 130 shows a predetermined tendency indicating that the electric quantities cannot be output normally based on the magnitude relationship between at least one of the voltage change rate or the current change rate and the predetermined threshold value. When the determination is made, the time ratio calculation unit 10f calculates the voltage abnormal time ratio, the current abnormal time ratio is calculated, and the second determination unit 10g determines that the current abnormal time ratio is smaller than the second threshold value. When it is determined that the current abnormal time ratio is equal to or less than the second threshold value and equal to or greater than the third threshold value smaller than the second threshold value, it is determined that the predetermined string 130 is shaded. According to this embodiment, it can be easily determined that the power generation of the string 130 is not reduced due to the influence of failure, deterioration over time, or the like. As a result, it is possible to easily determine the situation in which no human response is required, and thus unnecessary confirmation work can be suppressed, so that human cost can be suppressed.

Further, the photovoltaic power generation failure determination device 10 according to the present embodiment does not have to have the function of the rate of change calculation unit 10c. In this case, the first determination unit 10d and the time ratio calculation unit 10f execute the process by using the voltage value and the current value instead of the voltage change rate and the current change rate.

It should be noted that the above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention also includes an equivalent thereof.

10 Photovoltaic power generation failure judgment device 10a Acquisition unit 10b Mean value calculation unit 10c Change rate calculation unit 10d First judgment unit 10e Time calculation unit 10f Time ratio calculation unit 10g Second judgment unit 10h Failure judgment unit

Claims (13)

An acquisition unit that acquires various amount information indicating the amount of electricity output from the solar cell,
A first determination unit that determines whether or not the values related to the various amounts of electricity show a predetermined tendency with respect to a predetermined value.
A calculation unit that calculates the time for the predetermined tendency or the time point for showing the predetermined tendency.
Based on the determination result of the first determination unit, the calculation result of the calculation unit, and a predetermined threshold value,
A second determination unit that determines the state of the solar cell,
A photovoltaic power generation failure determination device characterized by being equipped with. The calculation unit
Calculate the average amount of electricity indicating the average amount of electricity output from each of the plurality of solar cells.
The rate of change in the amount of electricity output from the predetermined solar cell among the plurality of solar cells, which indicates the ratio of the amount of electricity to the average amount of electricity, is calculated.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit according to claim 1, wherein the first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the various quantity change rate and the predetermined threshold value. Photovoltaic power generation failure judgment device. The electric quantities include a first quantity indicating a voltage.
The quantity change rate includes the voltage change rate corresponding to the first quantity.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the voltage change rate and the predetermined threshold value.
The calculation unit calculates the first time ratio indicating the ratio of the first time having the predetermined tendency determined by the first determination unit to the predetermined period.
The photovoltaic power generation failure determination device according to claim 2, wherein the second determination unit determines that the solar cell is in a failure state when the first time ratio is determined to be equal to or higher than the first threshold value. .. The electric quantities include a first quantity indicating a voltage and a second quantity indicating a current.
The various quantity change rate includes a voltage change rate corresponding to the first various quantities and a current change rate corresponding to the second various quantities.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the voltage change rate or at least one of the current change rates and the predetermined threshold value.
The calculation unit
In the first determination unit, the first time ratio indicating the ratio of the first time, which is the predetermined tendency, which is determined based on the magnitude relationship between the voltage change rate and the predetermined threshold value, to the predetermined period is calculated. ,
In the first determination unit, a second time ratio indicating a ratio of the second time having the predetermined tendency to a predetermined period, which is determined based on the magnitude relationship between the current change rate and the predetermined threshold value, is calculated.
When the second determination unit determines that the first time ratio is smaller than the first threshold value and determines that the second time ratio is equal to or higher than the second threshold value, the solar cell is in a state of reduced power generation. The photovoltaic power generation failure determination device according to claim 2 or 3, wherein it is determined to be present. When the second determination unit determines that the first time ratio is equal to or higher than the first threshold value, the second time ratio is equal to or higher than the second threshold value at a predetermined time point prior to the determination time. The photovoltaic power generation failure determination device according to claim 4, wherein the solar cell is determined to be in a low power generation state. The electric quantities include a first quantity indicating a voltage and a second quantity indicating a current.
The various quantity change rate includes a voltage change rate corresponding to the first various quantities and a current change rate corresponding to the second various quantities.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the voltage change rate or at least one of the current change rates and the predetermined threshold value.
The calculation unit
The first determination unit calculates the first hour ratio indicating the ratio of the first time having the predetermined tendency, which is determined based on the magnitude relationship between the voltage change rate and the predetermined threshold value, to the predetermined period. And
In the first determination unit, a second time ratio indicating a ratio of the second time having the predetermined tendency to the predetermined period, which is determined based on the magnitude relationship between the current change rate and the predetermined threshold value, is calculated. ,
When the second determination unit determines that the second time ratio is smaller than the second threshold value, the second time ratio is equal to or less than the second threshold value and smaller than the second threshold value. Is,
The photovoltaic power generation failure determination device according to any one of claims 2 to 5, wherein it is determined that the solar cell is shaded. The electric quantities include a first quantity indicating a voltage.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the first quantities and the predetermined threshold value.
The calculation unit calculates a third time ratio indicating the ratio of the third time having the predetermined tendency determined by the first determination unit to the predetermined period.
The photovoltaic power generation failure determination device according to claim 1, wherein the second determination unit determines that the solar cell is in a failure state when the third time ratio is determined to be equal to or higher than the fourth threshold value. .. The electric quantities include a first quantity indicating a voltage and a second quantity indicating a current.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the first quantity or at least one of the second quantities and the predetermined threshold value.
The calculation unit
The first determination unit calculates a third hour ratio indicating the ratio of the third time, which is the predetermined tendency, determined based on the magnitude relationship between the first quantities and the predetermined threshold value, to a predetermined period. And
In the first determination unit, the fourth hour ratio indicating the ratio of the fourth time, which is the predetermined tendency, which is determined based on the magnitude relationship between the second quantities and the predetermined threshold value, to the predetermined period is calculated. And
When the second determination unit determines that the third time ratio is smaller than the fourth threshold value and determines that the fourth time ratio is equal to or higher than the fifth threshold value, the solar cell is in a state of reduced power generation. The solar power generation failure determination device according to claim 7, wherein it is determined to be present. The electric quantities include a first quantity indicating a voltage and a second quantity indicating a current.
The predetermined tendency indicates that the solar cell is not able to output various amounts of electricity normally.
The first determination unit determines whether or not the predetermined tendency is exhibited based on the magnitude relationship between the first quantity or at least one of the second quantities and the predetermined threshold value.
The calculation unit
The first determination unit calculates a third hour ratio indicating the ratio of the third time, which is the predetermined tendency, determined based on the magnitude relationship between the first quantities and the predetermined values, to a predetermined period. And
The fourth hour ratio indicating the ratio of the fourth hour having the predetermined tendency to the predetermined period, which is determined by the first determination unit based on the magnitude relationship between the second quantity and the predetermined value, is determined. Calculate and
When the second determination unit determines that the fourth time ratio is smaller than the fifth threshold value, the fourth time ratio is equal to or less than the fifth threshold value and smaller than the fifth threshold value. Is,
The photovoltaic power generation failure determination device according to claim 7 or 8, wherein it is determined that the solar cell is shaded. The photovoltaic power generation failure determination device according to any one of claims 1 to 8, wherein the first determination unit and the second determination unit perform determination during a time from sunset to sunrise. .. The computer
The acquisition step to acquire the quantity information indicating the quantity of electricity output from the solar cell,
A first determination step for determining whether or not the values related to the electric quantities show a predetermined tendency with respect to a predetermined value, and
A calculation step for calculating the time for the predetermined tendency or the time point for showing the predetermined tendency,
A second determination step for determining the state of the solar cell based on the determination result in the first determination step, the calculation result in the calculation step, and a predetermined threshold value.
Solar power generation failure judgment method to realize On the computer
An acquisition function that acquires various amount information indicating the amount of electricity output from the solar cell,
A first determination function for determining whether or not the values related to the electric quantities show a predetermined tendency with respect to a predetermined value, and
A calculation function for calculating the time of the predetermined tendency or the time point of showing the predetermined tendency,
A second determination function for determining the state of the solar cell based on the determination result in the first determination function, the calculation result in the calculation function, and a predetermined threshold value.
A program to realize. On the computer
An acquisition function that acquires various amount information indicating the amount of electricity output from the solar cell,
A first determination function for determining whether or not the values related to the electric quantities show a predetermined tendency with respect to a predetermined value, and
A calculation function for calculating the time of the predetermined tendency or the time point of showing the predetermined tendency,
A second determination function for determining the state of the solar cell based on the determination result in the first determination function, the calculation result in the calculation function, and a predetermined threshold value.
A computer-readable recording medium that records programs to achieve this.

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