JP2023009783A - Determination device and determination method - Google Patents

Abstract

To easily detect distortion occurring on a panel surface of a power generation unit in a photovoltaic power generation system at low cost.SOLUTION: A determination device is used in a photovoltaic power generation system including a power generation unit including a solar cell panel, and includes an acquisition unit that acquires measurement information indicating a measurement result of the output current of the power generation unit, and a determination unit for calculating a statistical value which is a value in at least any one of a first time zone, a second time zone and a third time zone in a time order per day based on the measurement information acquired by the acquisition unit, the value being based on the output current of a target power generation unit which is the power generation unit to be determined, and the determination unit performing determination processing for determining distortion of the surface of the solar cell panel in the target power generation unit based on the calculated statistical value.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a determination device and a determination method.

In recent years, techniques have been developed to detect physical phenomena such as deformation of buildings or parts. For example, International Publication No. 2018/047833 (Patent Document 1) discloses the following sensor structure. That is, the sensor structure is composed of a first conductive material and includes a plurality of high-resistance partial current-carrying sections 95T that are spaced apart from each other, and a second conductive material that has a smaller electrical resistivity than the first conductive material. each of which is arranged to connect the paired high-resistance partial current-carrying sections 95T and has a plurality of low-resistance partial current-carrying sections 95Q arranged at intervals from each other, the high-resistance section A physical phenomenon is detected by a change in electrical resistance in a range including both the energized section 95T and the low-resistance partial energized section 95Q.

International Publication No. 2018/047833

In a photovoltaic power generation system, the frame on which the power generation unit is installed or the panel surface of the power generation unit itself may be distorted due to the influence of an earthquake, snowfall, typhoon, or the like. In order to detect such strain, it is conceivable to actually visually inspect the power generating unit during a field survey, or to install a sensor that detects a physical phenomenon, such as a strain sensor, on the frame. However, such a method has problems such as requiring much labor and increasing costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a determination device and a device capable of easily and inexpensively detecting distortion occurring on a panel surface of a power generation unit in a photovoltaic power generation system. It is to provide a judgment method.

A determination device of the present disclosure is a determination device used in a photovoltaic power generation system including a power generation unit including a solar cell panel, the acquisition unit acquiring measurement information indicating the measurement result of the output current of the power generation unit; A value based on the output current of the target power generation unit, which is the power generation unit to be determined, based on the measurement information acquired by the acquisition unit, and is a first time zone and a second time in a day in chronological order. calculating a statistic value that is a value in at least one of the time period and the third time period, and determining the distortion of the surface of the solar cell panel in the target power generation section based on the calculated statistic value and a determination unit that performs determination processing.

A determination method of the present disclosure is a determination method in a determination device used in a photovoltaic power generation system including a power generation unit including a solar cell panel, the step of acquiring measurement information indicating a measurement result of an output current of the power generation unit; , a value based on the output current of the target power generation unit, which is the power generation unit to be determined, based on the acquired measurement information, and is a first time zone, a second time zone, and a second time zone in a day in chronological order. calculating a statistical value that is a value in at least one of the three time periods; and determining the distortion of the surface of the solar cell panel in the target power generation section based on the calculated statistical value. and performing processing.

The present disclosure can be implemented not only as a determination device including such a characteristic processing unit, but also as a program for causing a computer to execute such characteristic processing. Also, the present disclosure can be implemented as a semiconductor integrated circuit that implements part or all of the determination device, or as a determination system that includes the determination device.

Advantageous Effects of Invention According to the present disclosure, it is possible to easily and at low cost detect distortion occurring in a panel surface of a power generation unit in a photovoltaic power generation system.

FIG. 1 is a diagram showing the configuration of a photovoltaic power generation system according to an embodiment of the present disclosure. FIG. 2 is a diagram showing the configuration of a PCS unit according to the embodiment of the present disclosure. FIG. 3 is a diagram showing the configuration of a current collecting unit according to an embodiment of the present disclosure. FIG. 4 is a diagram showing the configuration of a solar cell unit according to an embodiment of the present disclosure. FIG. 5 is a diagram showing the configuration of a monitoring system according to an embodiment of the present disclosure. FIG. 6 is a diagram showing the configuration of a monitoring device in the monitoring system according to the embodiment of the present disclosure. FIG. 7 is a diagram showing the configuration of a determination device in the monitoring system according to the embodiment of the present disclosure. FIG. 8 is a diagram illustrating an example of monitoring information held by a determination device in the monitoring system according to the embodiment of the present disclosure; FIG. 9 is a diagram for explaining first weather determination processing by the weather determination unit in the determination device according to the embodiment of the present disclosure. FIG. 10 is a diagram for explaining second weather determination processing by the weather determination unit in the determination device according to the embodiment of the present disclosure. FIG. 11 is a diagram showing temporal changes in the output power of the power generation unit in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 12 is a diagram for explaining a phenomenon caused by distortion in the central portion of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 13 is a diagram for explaining a phenomenon caused by distortion at the edge on the west side of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 14 is a diagram for explaining a phenomenon caused by distortion at the edge on the east side of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 15 is a diagram for explaining a phenomenon caused by distortion at both ends of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. FIG. 16 is a list of phenomena corresponding to the locations of distortion shown in FIGS. 12 to 15 . FIG. 17 is a flowchart that defines an operation procedure when the determination device according to the embodiment of the present disclosure performs distortion determination processing.

First, the contents of the embodiments of the present disclosure will be listed and described.
(1) A determination device according to an embodiment of the present disclosure is a determination device used in a photovoltaic power generation system including a power generation unit including a solar cell panel, and is measurement information indicating a measurement result of an output current of the power generation unit. and a value based on the output current of the target power generation unit, which is the power generation unit to be determined, based on the measurement information acquired by the acquisition unit, in chronological order of one day calculating a statistical value that is a value in at least one of a first time period, a second time period, and a third time period; and based on the calculated statistical value, the solar cell in the target power generation unit a determination unit that performs determination processing for determining distortion of the surface of the panel.

With such a configuration, it is possible to detect the strain on the panel surface of the power generation unit without actually visually inspecting the power generation unit by field survey or without attaching a strain sensor or the like to the frame. Therefore, it is possible to easily detect the distortion occurring in the panel surface of the power generation unit in the photovoltaic power generation system at low cost.

In addition, with the configuration using the statistical value based on the output current of the target power generation unit in at least one of the first time zone, the second time zone, and the third time zone, the output power of the target power generation unit Even if there is distortion to the extent that no clear change appears, it is possible to detect the distortion at an early stage.

(2) Preferably, in the photovoltaic power generation system, a connection unit is provided to aggregate output lines from the plurality of power generation units, and the determination unit includes the first time period, the second time period and the second time period. a reference value based on the output currents of the plurality of power generation units belonging to the connection section in at least one of three time periods; and the statistical value of the target power generation section belonging to the connection section. The determination process is performed based on the result of comparison with.

In this way, by comparing the reference value based on the output currents of the plurality of power generation units belonging to the connection section and the statistical value based on the output current of the target power generation unit, the phenomenon of the statistical value caused by distortion can be easily identified. can do.

(3) More preferably, in the determination process, the determination unit compares whether the statistical value in the first time period or the third time period is smaller than the reference value in the corresponding time period. I do.

For example, when the longitudinal direction of the solar cell panel is provided along the east-west direction, and when the edge of the solar cell panel on the west side or the east side is distorted, the first time zone or the third time zone During the time period, the statistical value based on the output current of the target power generation unit is smaller than the reference value. Therefore, with the configuration as described above, it is possible to easily determine whether or not the edge portion on the west side or the east side of the solar cell panel is distorted.

(4) More preferably, in the determination process, the determination unit determines whether the statistical value in each time slot of the first time slot and the third time slot is smaller than the reference value in the corresponding time slot. and whether the statistical value in the second time period is greater than the reference value in the second time period.

For example, when the longitudinal direction of the solar cell panel is along the east-west direction, and when the central portion in the longitudinal direction of the solar cell panel is distorted, the first time period and the third time period In the period, the statistical value based on the output current of the target power generation unit is smaller than the reference value, and in the second time period, the statistical value is larger than the reference value. Therefore, with the configuration as described above, it is possible to easily determine whether or not the central portion in the longitudinal direction of the solar cell panel is distorted.

(5) More preferably, in the determination process, the determination unit compares whether the statistical value in the second time period is smaller than the reference value in the second time period.

For example, when the longitudinal direction of the solar cell panel is along the east-west direction, and when distortion occurs at both ends of the solar cell panel on the west and east sides, in the second time zone, the target A statistical value based on the output current of the power generation unit is smaller than the reference value. Therefore, with the configuration as described above, it is possible to easily determine whether or not the both ends of the solar cell panel on the west and east sides are distorted.

(6) More preferably, the determination unit determines the type of distortion of the power generation unit based on a comparison result in the determination process.

The difference between the statistic value based on the output current of the target power generation unit and the reference value changes according to the type of distortion in each of the first time period, the second time period, and the third time period. Therefore, as described above, the type of distortion of the power generation section can be easily determined by using the result of comparison between the statistical value and the reference value in each time period.

(7) More preferably, the determination unit selects at least one of distortion in the east edge, distortion in the west edge, and distortion in the central portion of the surface of the solar cell panel as the type of distortion in the power generation unit. judge one.

With such a configuration, it is possible for the administrator or the like to grasp the location where the distortion occurs and take more appropriate measures.

(8) Preferably, the determination unit determines the maximum value in one day of a maximum value among the power generation units, which is the maximum value among the plurality of power generation units based on the output current of the power generation unit, and the power generation unit The judging process is selectively performed for days on which the temporal change in the inter-part maximum value satisfies a predetermined condition.

With such a configuration, for example, the statistical value based on the output current of the target power generation unit, such as a day when the output power fluctuates little throughout the day and the solar power generation system can generate power equal to or higher than the standard performance value Since the determination process can be performed on a day when the phenomenon due to distortion is likely to appear, more accurate determination results can be obtained.

(9) A determination method according to an embodiment of the present disclosure is a determination method in a determination device used in a photovoltaic power generation system including a power generation unit including a solar cell panel, wherein the measurement result of the output current of the power generation unit is a value based on the output current of the target power generation unit, which is the power generation unit to be determined, based on the acquired measurement information, the first hour in time order of one day calculating a statistical value that is a value in at least one of a time period, a second time period, and a third time period; and based on the calculated statistical value, the solar cell panel in the target power generation unit. and performing a determination process for determining the distortion of the surface of the .

With such a method, it is possible to detect the strain on the panel surface of the power generation unit without actually visually observing the power generation unit by field survey or without attaching a strain sensor or the like to the frame. Therefore, it is possible to easily detect the distortion occurring in the panel surface of the power generation unit in the photovoltaic power generation system at low cost.

In addition, by using a statistical value based on the output current of the target power generation unit in at least one of the first time period, the second time period, and the third time period, the output power of the target power generation unit Even if there is distortion to the extent that no clear change appears, it is possible to detect the distortion at an early stage.

Embodiments of the present disclosure will be described below with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. Moreover, at least part of the embodiments described below may be combined arbitrarily.

<Configuration and basic operation>
[Configuration of photovoltaic power generation system]
FIG. 1 is a diagram showing the configuration of a photovoltaic power generation system according to an embodiment of the present disclosure.

Referring to FIG. 1 , solar power generation system 401 includes four PCS (Power Conditioning Subsystem) units 80 and cubicles 6 . Cubicle 6 includes copper bars 73 .

Although four PCS units 80 are representatively shown in FIG. 1, more or fewer PCS units 80 may be provided.

FIG. 2 is a diagram showing the configuration of a PCS unit according to the embodiment of the present disclosure.

Referring to FIG. 2, PCS unit 80 includes four power collection units 60 and PCS (power converter) 8 . PCS 8 includes copper bar 7 and power converter 9 .

FIG. 2 representatively shows four collector units 60, but more or fewer collector units 60 may be provided.

FIG. 3 is a diagram showing the configuration of a current collecting unit according to an embodiment of the present disclosure.

Referring to FIG. 3 , current collection unit 60 includes four solar cell units 74 and current collection box 71 . A current collection box 71 has a copper bar 72 .

FIG. 3 representatively shows four solar cell units 74, but more or fewer solar cell units 74 may be provided.

FIG. 4 is a diagram showing the configuration of a solar cell unit according to an embodiment of the present disclosure.

Referring to FIG. 4 , solar cell unit 74 includes four power generation sections 78 and junction box (connection section) 76 . The power generation unit 78 has a solar cell panel. Junction box 76 has copper bars 77 .

Although four power generation units 78 are representatively shown in FIG. 4, more or less power generation units 78 may be provided.

The power generation unit 78 is a string in which four solar panels 79A, 79B, 79C, and 79D are connected in series in this example. Each of the solar cell panels 79A, 79B, 79C, and 79D is also referred to as a solar cell panel 79 hereinafter.

Although four solar panels 79 are representatively shown in FIG. 4, more or fewer solar panels 79 may be provided.

In the photovoltaic power generation system 401 , output lines and aggregate lines, that is, power lines, from the plurality of power generation units 78 are electrically connected to the cubicle 6 respectively.

More specifically, the output line 1 of the power generation section 78 has a first end connected to the power generation section 78 and a second end connected to the copper bar 77 . Each output line 1 is aggregated into an aggregate line 5 via a copper bar 77 . Copper bar 77 is provided inside junction box 76, for example.

Upon receiving sunlight, the power generation unit 78 converts the energy of the received sunlight into DC power and outputs the converted DC power to the output line 1 .

3 and 4, aggregate line 5 has a first end connected to copper bar 77 in a corresponding solar cell unit 74 and a second end connected to copper bar 72 . Each aggregate line 5 is aggregated into an aggregate line 2 via a copper bar 72 . Copper bar 72 is provided, for example, inside collector box 71 .

1 to 4, in solar power generation system 401, each output line 1 from a plurality of power generation units 78 is aggregated into aggregate line 5, and each aggregate line 5 is aggregated into aggregate line 2, as described above. , each aggregated line 2 is aggregated into an aggregated line 4 , and each aggregated line 4 is electrically connected to a cubicle 6 .

More specifically, each aggregate line 2 has a first end connected to the copper bar 72 of the corresponding current collecting unit 60 and a second end connected to the copper bar 7 . In PCS 8 , internal line 3 has a first end connected to copper bar 7 and a second end connected to power converter 9 .

In the PCS 8, the power conversion unit 9, for example, outputs the DC power generated in each power generation unit 78 via the output line 1, the copper bar 77, the aggregate line 5, the copper bar 72, the aggregate line 2, the copper bar 7 and the internal line 3. , it converts the received DC power into AC power and outputs it to the aggregation line 4 .

Aggregate line 4 has a first end connected to power converter 9 and a second end connected to copper bar 73 .

In the cubicle 6 , the AC power output from the power converter 9 in each PCS 8 to each aggregate line 4 is output to the grid via the copper bar 73 .

[Surveillance system configuration]
FIG. 5 is a diagram showing the configuration of a monitoring system according to an embodiment of the present disclosure.

Referring to FIG. 5, monitoring system 301 is used in photovoltaic power generation system 401 . The monitoring system 301 includes one or more determination devices 101 , multiple monitoring devices 111 , and multiple collection devices 151 . In FIG. 5, the monitoring system 301 includes one determination device 101 as an example.

FIG. 5 representatively shows four monitoring devices 111 provided corresponding to one current collecting unit 60, but more or fewer monitoring devices 111 may be provided.

In the monitoring system 301, sensor information in the monitoring device 111, which is a child device, is transmitted to the collecting device 151 regularly or irregularly.

The monitoring device 111 is provided in the current collecting unit 60, for example. More specifically, four monitoring devices 111 are provided corresponding to the four solar cell units 74, respectively. Each monitoring device 111 is, for example, electrically connected to a corresponding output line 1 and aggregate line 5 .

The monitoring device 111 measures the current of each output line 1 in the corresponding solar cell unit 74 using a sensor. Also, the monitoring device 111 measures the voltage of each output line 1 in the corresponding solar cell unit 74 using a sensor.

The collection device 151 is provided near the PCS8, for example. More specifically, the collection device 151 is provided corresponding to the PCS 8 and electrically connected to the copper bar 7 via the signal line 46 .

The monitoring device 111 and the collection device 151 transmit and receive information by performing power line communication (PLC: Power Line Communication) via the integrated lines 2 and 5 .

More specifically, each monitoring device 111 transmits monitoring information indicating current and voltage measurements of the corresponding output line. The collection device 151 collects measurement results of each monitoring device 111 .

[Configuration of monitoring device]
FIG. 6 is a diagram showing the configuration of a monitoring device in the monitoring system according to the embodiment of the present disclosure. In FIG. 6 output line 1, aggregate line 5 and copper bar 77 are shown in more detail.

Referring to FIG. 6, output line 1 includes a plus side output line 1p and a minus side output line 1n. Aggregate line 5 includes a plus side aggregate line 5p and a minus side aggregate line 5n. Copper bars 77 include plus side copper bars 77p and minus side copper bars 77n.

Although not shown, copper bars 72 in current collection box 71 shown in FIG. 3 include plus side copper bars 72p and minus side copper bars 72n corresponding to plus side aggregate line 5p and minus side aggregate line 5n, respectively.

The plus side output line 1p has a first end connected to the corresponding power generation section 78 and a second end connected to the plus side copper bar 77p. The negative output line 1n has a first end connected to the corresponding power generation section 78 and a second end connected to the negative copper bar 77n.

The plus side aggregate line 5 p has a first end connected to the plus side copper bar 77 p and a second end connected to the plus side copper bar 72 p in the current collection box 71 . The negative aggregate line 5n has a first end connected to the negative copper bar 77n and a second end connected to the negative copper bar 72n in the collector box 71 .

The monitoring device 111 includes a detection processing unit 11 , four current sensors 16 , a voltage sensor 17 and a communication unit 14 . Note that the monitoring device 111 may have more or less current sensors 16 depending on the number of output lines 1 .

Monitoring device 111 is provided, for example, near power generation unit 78 . Specifically, the monitoring device 111 is provided, for example, inside a connection box 76 provided with a copper bar 77 to which the output line 1 to be measured is connected. Note that the monitoring device 111 may be provided outside the connection box 76 .

Monitoring device 111 is, for example, electrically connected to plus-side aggregate line 5p and minus-side aggregate line 5n via plus-side power supply line 26p and minus-side power supply line 26n, respectively. Each of the plus-side power supply line 26p and the minus-side power supply line 26n is also referred to as a power supply line 26 hereinafter.

Each monitoring device 111 transmits monitoring information indicating the measurement result of the corresponding power generation unit 78 via the power line connected to itself and the collecting device 151 .

Specifically, the communication unit 14 in the monitoring device 111 can perform power line communication via an aggregate line with the collection device 151 that collects the measurement results of the plurality of monitoring devices 111 . More specifically, the communication section 14 can transmit and receive information via the aggregate lines 2 and 5 . Specifically, the communication unit 14 performs power line communication with the collection device 151 via the power line 26 and the aggregate lines 2 and 5 .

The detection processing unit 11 is set, for example, to create monitoring information indicating the measurement results of the current and voltage of the corresponding output line 1 at predetermined time intervals.

A current sensor 16 measures the current in the output line 1 . More specifically, the current sensor 16 is, for example, a Hall element type current probe. The current sensor 16 uses power received from a power supply circuit (not shown) of the monitoring device 111 to measure the current flowing through the corresponding negative output line 1n and outputs a signal indicating the measurement result to the detection processing unit 11 . The current sensor 16 may measure the current flowing through the plus side output line 1p.

A voltage sensor 17 measures the voltage of the output line 1 . More specifically, voltage sensor 17 measures the voltage between plus side copper bar 77p and minus side copper bar 77n and outputs a signal indicating the measurement result to detection processing unit 11 .

For example, the detection processing unit 11 performs signal processing such as averaging and filtering on the measurement signals received from the current sensors 16 and the voltage sensors 17 at predetermined time intervals, and converts the signals into digital signals.

The detection processing unit 11 obtains the measured value indicated by each created digital signal, the ID of the corresponding current sensor 16 (hereinafter also referred to as current sensor ID), the ID of the voltage sensor 17 (hereinafter also referred to as voltage sensor ID), and the ID of its own monitoring device 111 (hereinafter also referred to as a monitoring device ID).

The detection processing unit 11 creates a monitoring information packet in which the source ID is the monitoring device ID of itself, the destination ID is the ID of the collection device 151, and the data portion is the monitoring information. The detection processing unit 11 then outputs the created monitoring information packet to the communication unit 14 . Note that the detection processing unit 11 may include a sequence number in the monitoring information packet.

The communication unit 14 transmits the monitoring information packet received from the detection processing unit 11 to the collection device 151 .

Referring again to FIG. 5, collection device 151 is capable of transmitting and receiving information via aggregation lines 2 and 5 . Specifically, the collection device 151 performs power line communication with the monitoring device 111 via the signal line 46 and the aggregation lines 2 and 5, and receives monitoring information packets from the plurality of monitoring devices 111, for example.

The collection device 151 has a counter and a storage unit, and upon receiving a monitoring information packet from the monitoring device 111, acquires the monitoring information from the received monitoring information packet and acquires the count value of the counter as the reception time. After including the reception time in the monitoring information, the collection device 151 saves the monitoring information in a storage unit (not shown).

[Configuration of determination device]
FIG. 7 is a diagram showing the configuration of a determination device in the monitoring system according to the embodiment of the present disclosure.

Referring to FIG. 7 , determination device 101 includes distortion determination section 81 , weather determination section 82 , communication processing section (acquisition section) 84 , and storage section 85 . Distortion determination unit 81, weather determination unit 82, and communication processing unit 84 are implemented by processors such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), for example. Storage unit 85 is, for example, a nonvolatile memory.

For example, the ID of the monitoring device 111 to be managed, that is, the monitoring device ID, is registered in the storage unit 85 of the determination device 101 . Further, in the storage unit 85, a correspondence relationship R1 between the monitoring device ID and the ID of each sensor included in the monitoring device 111 having the monitoring device ID, that is, the current sensor ID and the voltage sensor ID is registered.

The determination device 101 is, for example, a server, periodically acquires monitoring information from the collecting device 151, and processes the acquired monitoring information. For example, the determination device 101 receives monitoring information from some or all of the plurality of collecting devices 151 and sequentially processes the corresponding monitoring information for each PCS unit 80 . Note that the determination device 101 may be configured to be built in the collection device 151, for example.

More specifically, the communication processing unit 84 in the determination device 101 transmits and receives information to and from other devices such as the collection device 151 via the network.

The communication processing unit 84 acquires measurement information (hereinafter also referred to as “monitoring information”) indicating the measurement results of the output current and output voltage of each power generation unit 78 at a designated daily processing timing, for example, midnight every day. do. If the determination device 101 is incorporated in the collection device 151, monitoring information can be easily collected at shorter intervals.

More specifically, when the daily processing timing arrives, the communication processing unit 84 refers to each monitoring device ID registered in the storage unit 85, corresponds to each of the referenced monitoring device IDs, and stores the data within 24 hours of the daily processing timing. A monitoring information request is sent to the collection device 151 for requesting monitoring information including the reception times belonging to the previous to the daily processing timing (hereinafter also referred to as processing day).

When the monitoring information request is received from the determination device 101, the collection device 151 transmits one or more pieces of monitoring information satisfying the content of the monitoring information request to the determination device 101 according to the received monitoring information request.

FIG. 8 is a diagram illustrating an example of monitoring information held by a determination device in the monitoring system according to the embodiment of the present disclosure;

8, the monitoring information includes a monitoring device ID, a current sensor ID of each current sensor 16 in monitoring device 111, a current value that is a measurement value of each current sensor 16, and a voltage sensor ID of voltage sensor 17. , the voltage value that is the measurement value of the voltage sensor 17, and the reception time. The reception time is the time when the collection device 151 receives the monitoring information transmitted from the monitoring device 111 .

When receiving one or a plurality of pieces of monitoring information from the collecting device 151 as a response to the monitoring information request, the communication processing unit 84 stores the received monitoring information in the storage unit 85 and outputs a processing completion notification to the weather determination unit 82. do.

Referring to FIG. 7 again, upon receiving the processing completion notification from the communication processing unit 84, the weather determination unit 82 determines that the weather on the processing day satisfies a predetermined condition based on the measurement result indicated by the monitoring information of each power generation unit 78. Weather determination processing is performed to determine whether or not, and the determination result of the weather determination processing is output to the distortion determination unit 81 . For example, when the weather determination unit 82 determines that the processing day is fine by the weather determination processing, the weather determination unit 82 outputs to the distortion determination unit 81 a determination result indicating that the weather on the processing day satisfies a predetermined condition.

When receiving from the weather determination unit 82 a determination result indicating that the weather on the processing day satisfies a predetermined condition, the distortion determination unit 81 generates power based on the output current of each power generation unit 78 stored in the storage unit 85. A distortion determination process for determining distortion on the panel surface is performed in the section 78 .

Specifically, the distortion determination unit 81 calculates, for each connection box 76, a statistical value based on the output currents of the plurality of power generation units 78 belonging to the connection box 76 at the same reception time. Then, the distortion determination unit 81 performs distortion determination processing on the power generation unit 78 using the calculated statistical value and the value based on the output current of the power generation unit 78 to which the connection box 76 belongs, and communicates the determination result. 84 is notified.

[Weather Judgment Processing by Weather Judgment Unit]
(First weather determination process)
FIG. 9 is a diagram for explaining first weather determination processing by the weather determination unit in the determination device according to the embodiment of the present disclosure. In FIG. 9, the horizontal axis indicates time and the vertical axis indicates output power.

Referring to FIG. 9, upon receiving the processing completion notification from communication processing unit 84, weather determination unit 82 performs the first weather determination based on the output current and output voltage indicated by the monitoring information acquired by communication processing unit 84. process.

More specifically, the weather determination unit 82 refers to the correspondence relationship R1, and obtains from the storage unit 85 the current value that is the measurement value of each current sensor 16 and the corresponding voltage sensor 17 measurements are obtained.

Then, weather determination unit 82 multiplies each of the acquired multiple sets of current values and voltage values by the current value and the voltage value to obtain the output power of each of multiple power generation units 78 at the reception time included in the monitoring information. Calculate

In addition, for example, the weather determination unit 82 specifies the maximum value of the calculated output power of each of the plurality of power generation units 78 (hereinafter also referred to as the “maximum value between power generation units”) for each reception time, and A graph Gp1 is created to show temporal changes in the identified maximum value between power generation units.

Then, the weather determination unit 82 refers to the created graph Gp1 and determines whether or not the maximum value between power generation units satisfies the first predetermined condition. Specifically, the weather determination unit 82 checks whether the maximum value of the graph Gp1, that is, the maximum value in one day among the maximum values among the power generation units at each time is equal to or greater than a predetermined threshold value Pt. If the maximum value of Gp1 is greater than or equal to the predetermined threshold value Pt, it is determined that the first predetermined condition is satisfied.

The threshold Pt is, for example, a value based on the reference performance value of the output power of the entire photovoltaic power generation system 401 .

(Second weather determination process)
FIG. 10 is a diagram for explaining second weather determination processing by the weather determination unit in the determination device according to the embodiment of the present disclosure. In FIG. 10, the horizontal axis indicates time, and the vertical axis indicates severity of weather change.

9 and 10, when weather determination unit 82 determines in the above-described first weather determination process that the maximum value between power generation units satisfies the first predetermined condition, the maximum value between power generation units on the processing day. A second weather determination process is performed to determine whether or not the temporal change in value satisfies a second predetermined condition.

More specifically, the weather determination unit 82 creates a graph showing temporal changes in the slope of the graph Gp1 by time-differentiating the waveform of the graph Gp1 shown in FIG. Then, the weather determination unit 82 further time-differentiates the waveform of the graph, thereby creating a graph Gd showing the temporal change in the slope of the graph, as shown in FIG. 10 . That is, the weather determination unit 82 creates a graph Gd showing the severity of weather changes by performing two time differentiations on the waveform of the graph Gp1 shown in FIG.

Then, the weather determination unit 82 checks whether each of the absolute maximum value and the minimum absolute value of the values indicated by the created graph Gd is equal to or less than a predetermined threshold value Dt. Then, when both the absolute value of the maximum value and the absolute value of the minimum value are equal to or less than the threshold value Dt, the weather determination unit 82 determines that the temporal change in the maximum value among the power generation units on the processing day satisfies the second predetermined condition. judge.

The threshold Dt is, for example, a value set based on the reference performance value of the output power of the entire photovoltaic power generation system 401 and a predetermined rate of change.

In this way, the weather determination unit 82 performs the weather processing determination, so that the output power fluctuates little throughout the day and the photovoltaic power generation system 401 generates power equal to or greater than the standard performance value. It is possible to check whether it is a day (hereinafter also referred to as a “clear day”).

Note that, in the second weather determination process, the weather determination unit 82 performs time differentiation once on the waveform instead of performing time differentiation twice on the waveform shown by the graph Gp1, and uses the calculation result to perform a predetermined The configuration may be such that the condition is determined.

In addition, the weather determination unit 82 uses a high-pass filter or the like instead of time-differentiating the waveform shown in the graph Gp1 once or twice to extract a portion of the waveform showing a large temporal change, The configuration may be such that the predetermined condition is determined using the extraction result.

Further, the weather determination unit 82 may be configured to perform other weather determination processing in addition to the first weather determination processing and the second weather determination processing described above. For example, the weather determination unit 82 calculates the average value of the output power of the top quarter of the output powers of the plurality of power generation units 78 for each of the morning, daytime, and evening time zones. Then, if at least one of the calculated average values for each time period is equal to or less than a predetermined threshold value, the weather determination unit 82 may determine that the weather on the processing day does not satisfy the predetermined condition.

By making such determination, for example, it is possible to prevent erroneous determination that the processing day is a sunny day due to a large value of the output power of only one power generation unit 78 .

[Distortion Judgment Processing by Distortion Judging Unit]
(Description of assignment)
FIG. 11 is a diagram showing temporal changes in the output power of the power generation unit in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 11, the horizontal axis indicates time, and the vertical axis indicates output power.

Referring to FIG. 11, a graph Gp2a indicated by a solid line shows a temporal change in the output power of power generation unit 78 on the processing day when the panel surface is distorted. A graph Gp2b indicated by a dashed line indicates a temporal change in output power on a processing day of the normal power generation unit 78 with no distortion.

As shown in the graphs Gp2a and Gp2b, there is no clear difference in the temporal change in the output power between the distorted power generation unit 78 and the normal power generation unit 78. Therefore, the output power of each power generation unit 78 is Even if attention is paid to , it is difficult to specify the power generating section 78 in which distortion occurs.

On the other hand, when distortion occurs to the extent that a clear difference appears in the output power compared to the normal power generation section 78, the power generation section 78 in which the distortion occurs can be specified by paying attention to the output power. However, since the strain is severe at this stage, secondary disasters such as ground faults, electric shock accidents, and fires may occur, and early detection of strain is desired.

(Phenomenon depending on the location where strain occurs)
(Example 1) When distortion occurs in the central portion FIG. 12 is a diagram for explaining a phenomenon caused by distortion in the central portion of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 12, the horizontal axis indicates time, and the vertical axis indicates the difference in output current.

Here, it is assumed that the solar cell panel 79 in each power generation section 78 is provided so that the longitudinal direction thereof extends along the east-west direction. Referring to FIG. 12, when the panel surface of power generation unit 78 is distorted or dented in the central portion in the longitudinal direction, the plurality of power generation units 78 belonging to junction box 76 to which power generation unit 78 is connected may be damaged. The difference between the statistic value of the output current (hereinafter also referred to as “statistic value between power generation units”) and the output current of the power generation unit 78 transitions as shown in graph Gx1. The power generating section 78 in which distortion occurs in the central portion of the panel surface is hereinafter also referred to as "central distorted power generating section 78". The inter-power generating unit statistical value is the median value or average value of the output currents of the plurality of power generating units 78, or the like.

Here, the time from morning to evening in one day is divided into morning (first time zone), daytime (second time zone), and evening (third time zone) arranged chronologically. Specifically, daytime is a time period that includes two hours before and after Nanchu time, morning is a time period from sunrise to just before daytime, and evening is daytime. It is the time period from immediately after the period to the time of sunset.

Note that the daytime time zone is not limited to the time zone of two hours before and after Nanchu time, but may be, for example, one hour before or after Nanchu time or three hours before or after Nanchu time, in which solar power generation system 401 is provided. It may vary depending on the location, season, etc.

The output current of the central distortion power generation section 78 in each time period in the morning and in the evening becomes a value smaller than the statistical value between the power generation sections in the corresponding time period. In addition, the output current of the central distortion power generation section 78 in the daytime becomes a value larger than the statistical value between the power generation sections in the daytime.

On the other hand, the difference between the output current of normal power generating section 78 without distortion and the inter-power generating section statistical value transitions as shown in graph Gx2. In other words, the output current of the normal power generation section 78 has a value equivalent to the statistical value between the power generation sections in all the time zones of morning, daytime and evening.

(Example 2) When distortion occurs at the western edge FIG. 13 is a diagram for explaining a phenomenon caused by distortion at the western edge of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. be. In FIG. 13, the horizontal axis indicates time, and the vertical axis indicates the difference in output current.

Referring to FIG. 13 , when the western edge of the panel surface of power generation unit 78 is distorted, such as when the western edge of the panel surface of power generation unit 78 is lower than in the normal case, the panel surface of power generation unit 78 is deformed. The difference between the inter-power generating unit statistical value of the junction box 76 to which the power generating unit 78 is connected and the output current of the power generating unit 78 transitions as shown in the graph Gx3. The power generating section 78 in which distortion occurs at the western edge of the panel surface is hereinafter also referred to as the "west end distorted power generating section 78".

That is, the output current in the morning of the western end distortion power generation section 78 is smaller than the statistical value between the power generation sections in the morning. In addition, the output current of the western end distortion power generation unit 78 in each time period of daytime and evening is equivalent to the statistical value between power generation units in the corresponding time period.

(Example 3) When distortion occurs at the east end FIG. 14 is a diagram for explaining a phenomenon caused by distortion at the east end of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. be. In FIG. 14, the horizontal axis indicates time, and the vertical axis indicates the difference in output current.

Referring to FIG. 14, when the east end of the panel surface of power generation unit 78 is distorted, such as when the east end of the panel surface of power generation unit 78 is lower than in the normal case, the The difference between the statistical value between the power generation units of the junction box 76 to which the power generation unit 78 is connected and the output current of the power generation unit 78 transitions as shown in the graph Gx4. The power generation section 78 in which distortion occurs at the edge on the east side of the panel surface is hereinafter also referred to as the "east end distorted power generation section 78".

That is, the output current of the east end distortion power generation section 78 in each time period in the morning and in the daytime has a value equivalent to the statistical value between power generation sections in the corresponding time period. In addition, the output current of the east-end distortion power generation unit 78 in the evening has a smaller value than the statistical value between the power generation units in the evening.

(Example 4) When Distortion Occurs at Both Ends FIG. 15 is a diagram for explaining a phenomenon caused by distortion at both ends of the panel surface in the photovoltaic power generation system according to the embodiment of the present disclosure. In FIG. 15, the horizontal axis indicates time, and the vertical axis indicates the difference in output current.

Referring to FIG. 15, distortion occurs at both the east and west ends of the panel surface of power generation unit 78, such as lowering both the east and west ends of the panel surface of power generation unit 78 compared to the normal case. If the power generation unit 78 is connected, the difference between the power generation unit statistical value of the connection box 76 to which the power generation unit 78 is connected and the output current of the power generation unit 78 transitions as shown in the graph Gx5. The power generation section 78 in which distortion occurs at both ends of the panel surface is hereinafter also referred to as a "both-ends distortion power generation section 78".

That is, the output current of the both-ends strain power generation section 78 in each time period in the morning and evening is slightly smaller than or equal to the statistical value between the power generation sections in the corresponding time period. In addition, the output current of the both-ends strain power generation section 78 in the daytime is smaller than the statistical value between the power generation sections in the daytime.

FIG. 16 is a list of phenomena corresponding to the locations of distortion shown in FIGS. 12 to 15 .

Referring to FIG. 16, the difference between the output current of power generation unit 78 in which distortion occurs and the statistical value between power generation units is the location of distortion, that is, the type of distortion, in each of the morning, daytime, and evening time zones. Varies depending on Therefore, the distortion determination unit 81 in the determination device 101 can determine the type of distortion of the panel surface of the power generation unit 78 by confirming the difference in each time period. Details of the distortion determination processing by the distortion determination unit 81 will be described below.

(Details of distortion determination processing)
The distortion determination unit 81 selectively performs distortion determination processing on days when the weather on the processing day satisfies a predetermined condition. For example, as described above, when distortion determination unit 81 receives from weather determination unit 82 a determination result indicating that the weather on the processing day satisfies the predetermined condition, that is, when the processing date is a fine day, output of power generation unit 78 . Based on the current, distortion determination processing is performed to determine the distortion of the panel surface of the power generation unit 78 .

Specifically, the distortion determination unit 81 calculates, for example, a statistical value between power generation units of the connection box 76 to which the power generation unit 78 to be determined is connected, for each reception time. Then, distortion determination unit 81 calculates a time average value of statistical values between power generation units in at least one time period of morning, daytime, and evening, for example.

Moreover, the distortion determination unit 81 calculates the time average value of the output current of the power generation unit 78 to be determined in at least one of the morning, daytime, and evening time zones. Then, the distortion determination unit 81 confirms the magnitude relationship between the calculated time average value of the statistical value between the power generation units and the calculated time average value of the output current of the power generation unit 78 to be determined.

Here, when the distortion determination unit 81 calculates the time average value of the statistical values between the power generation units and the time average value of the output current of the power generation unit 78 to be determined in each of the morning, daytime, and evening time zones, More detailed contents of the distortion determination process will be described.

More specifically, the distortion determination unit 81 determines, for example, the time average value of the statistical values between the power generation units at each reception time included in the morning (hereinafter also referred to as the “first reference value C1”) and the The time average value of the output current of the power generation unit 78 in the morning (hereinafter also referred to as "first target value E1") is compared.

Similarly, for example, during the daytime, the distortion determination unit 81 also calculates the time average value of the statistical values between the power generation units at each reception time included in the second time period (hereinafter also referred to as "second reference value C2"). is compared with the time average value of the output current of the power generation unit 78 to be determined in the second time period (hereinafter also referred to as “second target value E2”).

Similarly, in the evening, for example, the distortion determination unit 81 similarly determines the time average value of the statistical values between the power generation units at each reception time included in the evening (hereinafter also referred to as the “third reference value C3”), and the determination The time average value of the output current in the evening of the target power generation unit 78 (hereinafter also referred to as "third target value E3") is compared.

Hereinafter, each of the first reference value C1, the second reference value C2 and the third reference value C3 is also simply referred to as "reference value C". Further, each of the first target value E1, the second target value E2 and the third target value E3 is also simply referred to as "target value E".

The distortion determination unit 81 can determine the type of distortion based on the comparison result of the magnitude relationship described above. For example, the distortion determination section 81 uses, for example, two thresholds Th1 and Th2 in the magnitude comparison. Assume that the threshold Th1 is a negative value and the threshold Th2 is a positive value.

Specifically, the value obtained by subtracting the first reference value C1 from the first target value E1, the value obtained by subtracting the second reference value C2 from the second target value E2, and the third reference value C3 from the third target value E3 Assume that the subtracted values are all within the range from threshold Th1 to threshold Th2. That is, when the following equations (11) to (13) are satisfied, the strain determination unit 81 determines that the power generation unit 78 to be determined is a normal power generation unit with no distortion, as shown in the graph Gx2 in FIG. 78.
Th1 ≤ E1-C1 ≤ Th2 (11)
Th1≦E2−C2≦Th2 (12)
Th1 ≤ E3-C3 ≤ Th2 (13)

Further, the value obtained by subtracting the first reference value C1 from the first target value E1 is equal to or less than the threshold Th1, the value obtained by subtracting the second reference value C2 from the second target value E2 is equal to or greater than the threshold Th2, and the third target value Assume that the value obtained by subtracting the third reference value C3 from E3 is equal to or less than the threshold Th1. That is, when the following equations (21) to (23) are satisfied, the distortion determination unit 81 causes distortion in the central portion of the panel surface of the power generation unit 78 to be determined, as shown in the graph Gx1 in FIG. determined to be
E1-C1≤Th1 (21)
Th2≦E2−C2 (22)
E3-C3≤Th1 (21)

Further, the value obtained by subtracting the first reference value C1 from the first target value E1 is less than or equal to the threshold value Th1, the value obtained by subtracting the second reference value C2 from the second target value E2, and the third reference value from the third target value E3. Assume that all the values obtained by subtracting the value C3 are within the range from the threshold Th1 to the threshold Th2. That is, when the following equations (31) to (33) are satisfied, the distortion determination unit 81 determines that the distortion at the west end of the panel surface of the power generation unit 78 to be determined is shown in the graph Gx3 in FIG. is determined to occur.
E1-C1≤Th1 (31)
Th1≤E2-C2≤Th2 (32)
Th1≤E3-C3≤Th2 (33)

Further, the value obtained by subtracting the first reference value C1 from the first target value E1 and the value obtained by subtracting the second reference value C2 from the second target value E2 are both within the range of the threshold Th1 and the threshold Th2, and the third Assume that the value obtained by subtracting the third reference value C3 from the target value E3 is equal to or less than the threshold Th1. That is, when the following equations (41) to (43) are satisfied, the distortion determination unit 81 determines that the distortion at the east end of the panel surface in the power generation unit 78 to be determined is shown in the graph Gx4 in FIG. is determined to occur.
Th1 ≤ E1-C1 ≤ Th2 (41)
Th1≤E2-C2≤Th2 (42)
E3-C3≤Th1 (43)

Moreover, the distortion determining section 81 can determine a combination of two or more of the distortion at the edge on the east side of the panel surface, the edge on the west side, and the distortion at the central portion. For example, the distortion determining section 81 can determine the distortion at both ends on the east side and the west side of the panel surface.

Specifically, the value obtained by subtracting the first reference value C1 from the first target value E1 and the value obtained by subtracting the third reference value C3 from the third target value E3 are both within the range of the threshold Th1 to the threshold Th2. , the value obtained by subtracting the second reference value C2 from the second target value E2 is equal to or less than the threshold Th1. That is, when the following equations (51) to (53) are satisfied, the distortion determination unit 81 determines that both the east and west ends of the panel surface of the power generation unit 78 to be determined are as shown in the graph Gx5 of FIG. It is determined that distortion occurs in
Th1 ≤ E1-C1 ≤ Th2 (51)
E2-C2≤Th1 (52)
Th1≤E3-C3≤Th2 (53)

In the morning and daytime, there may be times that are not included in either time zone, or there may be times that are included in both time zones. Also, between the daytime and the evening, there may be times that are not included in either time zone, or times that are included in both time zones.

Moreover, the distortion determination unit 81 may use, as the target value E, a statistical value other than the time average value, such as the median value of the output current of the power generation unit 78 to be determined in each time period.

Further, instead of using the output current itself as a value based on the output current of each power generation unit 78, the distortion determination unit 81 is configured to perform distortion determination processing using, for example, output power as a value based on the output current. may That is, the distortion determination section 81 may calculate the statistical value of the output power of the plurality of power generation sections 78 as the inter-power generation section statistical value. In this case, the distortion determination unit 81 uses, as the target value E, the median value or the average value of the output power of the power generation unit 78 to be determined in each time period.

Moreover, the determination device 101 may be configured without the weather determination unit 82 . In this case, the distortion determination unit 81 may, for example, display graphs showing the difference between the statistical values of the output currents of the plurality of power generation units 78 and the output current of the power generation unit 78 to be determined, as shown in FIGS. The waveform is smoothed by using a low-pass filter or by extracting a moving average value, and distortion is determined using the smoothed waveform. This makes it possible to obtain an accurate determination result in the distortion determination process even if the processing day is not a sunny day.

[Warning of distortion judgment result]
When the communication processing unit 84 receives notification of the result of the distortion determination process from the distortion determination unit 81, for example, based on the content of the notification, it determines whether or not to output an alarm.

For example, when the communication processing unit 84 receives notification that the power generation unit 78 to be determined is a normal power generation unit 78 with no distortion, the communication processing unit 84 determines not to output an alarm.

On the other hand, when the communication processing unit 84 receives a notification that the power generation unit 78 to be determined is distorted, it outputs an alarm to the administrator or the like. For example, the communication processing unit 84 displays the ID of the power generation unit 78, the type of distortion, and the like on a monitor or transmits them by e-mail.

Note that the distortion determination unit 81 may be configured so as not to determine the type of distortion. In this case, the distortion determination unit 81 notifies the communication processing unit 84 of the determination result indicating the presence or absence of distortion, for example. Then, when the communication processing unit 84 receives the notification of the determination result that the distortion has occurred from the distortion determination unit 81, for example, the ID of the abnormal power generation unit 78 is displayed on the monitor or sent by e-mail. do.

<Flow of operation>
Each device in the monitoring system 301 has a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads out from the memory and executes a program including part or all of each step of the following flowcharts. Programs for these multiple devices can each be installed from the outside. Programs for these devices are stored in recording media and distributed.

FIG. 17 is a flowchart that defines an operation procedure when the determination device according to the embodiment of the present disclosure performs distortion determination processing.

Referring to FIG. 17 , first, communication processing unit 84 acquires one or a plurality of pieces of monitoring information, and then stores each acquired piece of monitoring information in storage unit 85 and outputs a processing completion notice to weather determination unit 82 . (Step S10).

Next, upon receiving the processing completion notification from the communication processing unit 84, the weather determination unit 82 determines the output current and output voltage of each of the plurality of power generation units 78 based on the output current and output voltage indicated by the monitoring information acquired by the communication processing unit 84. A graph Gp1 is created that shows the temporal change in the maximum value among the power generation units, which is the maximum value of the output power.

Then, the weather determination unit 82 determines whether or not the maximum value between power generation units satisfies a first predetermined condition by confirming whether or not the maximum value of the created graph Gp1 is equal to or greater than a predetermined threshold value Pt. A first weather determination process is performed (step S11).

Next, when the maximum value between power generation units satisfies a first predetermined condition, weather determination unit 82 time-differentiates the waveform of graph Gp1 twice, for example. Then, the weather determination unit 82 confirms whether each of the absolute value of the maximum value and the absolute value of the minimum value indicated by the waveform obtained by the two-time time differentiation is equal to or less than a predetermined threshold value Dt. A second weather determination process is performed to determine whether or not the temporal change in the maximum value between departments satisfies a second predetermined condition (step S12).

Next, the strain determination unit 81 determines that the inter-power generation unit maximum value satisfies the first predetermined condition and the temporal change in the inter-power generation unit maximum value satisfies the second predetermined condition, that is, the processing date. Assume that the weather determination unit 82 has received a determination result indicating that the weather satisfies a predetermined condition. In this case, the distortion determining unit 81 calculates inter-power-generating-unit statistical values, which are statistical values of the output currents of the plurality of power-generating units 78, for each of the morning, daytime, and evening time zones. A time average value, that is, a reference value C is calculated (step S13).

Next, the distortion determination unit 81 calculates the time average value of the output current of the power generation unit 78 to be determined, that is, the target value E for each of the morning, daytime, and evening time slots (step S14).

Next, the distortion determination unit 81 determines the type of distortion of the power generation unit 78 to be determined by comparing the reference value C with the target value E for each of the morning, daytime, and evening time zones. The determination result is notified to the communication processing unit 84 (step S15).

Next, when the communication processing unit 84 receives notification of the result of the distortion determination process from the distortion determination unit 81, for example, based on the content of the notification, it determines whether or not to output an alarm. For example, when the communication processing unit 84 receives notification that there is a distorted power generation unit 78, it outputs an alarm to the administrator or the like (step S16).

Note that the calculation of the reference value C by the distortion determination unit 81 (step S13) may be performed after the calculation of the target value E (step S14).

Further, the distortion determination unit 81 calculates the time average value of the statistical values between the power generation units and the time average value of the output current of the power generation unit 78 to be determined for one or two of the morning, daytime, and evening time zones. It may be configured to calculate.

For example, the distortion determination unit 81 calculates the reference value C and the target value E for the morning time zone of the morning, daytime, and evening, and determines whether the target value E in the morning is smaller than the reference value C in the morning. By comparing , it can be determined whether or not the western edge of the panel surface of the power generation section 78 is distorted.

Further, for example, the distortion determination unit 81 calculates the reference value C and the target value E for the evening time zone among the morning, daytime, and evening, and determines whether the target value E for the evening is smaller than the reference value C for the evening. By comparing whether or not there is any distortion, it is possible to determine whether or not the east end of the panel surface of the power generation section 78 is distorted.

Further, for example, the distortion determination unit 81 calculates the reference value C and the target value E for the daytime time zone of the morning, daytime, and evening, and determines whether the target value E for the daytime is smaller than the reference value C for the daytime. By comparing whether or not there is any distortion, it is possible to determine whether or not there is distortion at both side end portions of the panel surface of the power generation section 78 .

In addition, the distortion determination unit 81 is not limited to the configuration of comparing the magnitude relationship between the target value E and the reference value C, and uses the target value E in at least one of the morning, daytime, and evening time zones. Another method may be used to determine the distortion of the panel surface of the power generation unit 78 .

By the way, in a photovoltaic power generation system, the frame on which the power generation unit is installed or the panel surface of the power generation unit itself may be distorted due to the influence of an earthquake, snowfall, typhoon, or the like. In order to detect such strain, it is conceivable to actually visually inspect the power generating unit during a field survey, or to install a sensor that detects a physical phenomenon, such as a strain sensor, on the frame. However, such a method has problems such as requiring much labor and increasing costs.

On the other hand, with the determination device 101 and the determination method according to the embodiment of the present disclosure, the distortion generated on the panel surface of the power generation unit 78 in the photovoltaic power generation system 401 can be easily and It can be detected at low cost.

The above-described embodiments should be considered as illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the scope of the claims rather than the above description, and is intended to include all changes within the meaning and scope of equivalents of the scope of the claims.

The above description includes the features appended below.
[Appendix 1]
A determination device used in a photovoltaic power generation system comprising a power generation unit including a solar panel,
an acquisition unit that acquires measurement information indicating a measurement result of the output current of the power generation unit;
Based on the measurement information acquired by the acquisition unit, a value based on the output current of the target power generation unit, which is the power generation unit to be determined, in a first time period in a day, a second calculating a statistic value that is a value in at least one of the time period and the third time period, and determining the distortion of the surface of the solar cell panel in the target power generation unit based on the calculated statistic value and a determination unit that performs determination processing to
The statistical value is the output current or output power of the target power generation unit,
The solar panel is provided such that the longitudinal direction of the solar panel extends along the east-west direction,
The judging device, wherein the judging unit judges which of the western edge, the eastern edge, the western and eastern edges, and the central portion in the longitudinal direction is where the distortion occurs in the solar cell panel. .

1 output line 2,4,5 aggregate line 3 internal line 6 cubicle 7 copper bar 8 PCS
9 power conversion unit 11 detection processing unit 14 communication unit 16 current sensor 17 voltage sensor 26 power supply line 46 signal line 60 current collection unit 71 current collection box 72, 73, 77 copper bar 74 solar cell unit 76 junction box (connection part)
78 power generation unit 79, 79A to 79D solar cell panel 80 PCS unit 81 distortion determination unit 82 weather determination unit 84 communication processing unit (acquisition unit)
85 storage unit 101 determination device 111 monitoring device 151 collection device 301 monitoring system 401 solar power generation system

Claims (9)

A determination device used in a photovoltaic power generation system comprising a power generation unit including a solar panel,
an acquisition unit that acquires measurement information indicating a measurement result of the output current of the power generation unit;
Based on the measurement information acquired by the acquisition unit, a value based on the output current of the target power generation unit, which is the power generation unit to be determined, in a first time period in a day, a second calculating a statistic value that is a value in at least one of the time period and the third time period, and determining the distortion of the surface of the solar cell panel in the target power generation unit based on the calculated statistic value A determination device comprising a determination unit that performs determination processing to determine whether the In the photovoltaic power generation system, a connection unit is installed to aggregate output lines from the plurality of power generation units,
The determination unit determines a value based on output currents of the plurality of power generation units belonging to the connection unit in at least one of the first time period, the second time period, and the third time period. 2 . The determination device according to claim 1 , wherein the determination process is performed based on a comparison result between a reference value that is , and the statistical value of the target power generation unit belonging to the connection unit. 3. The determination unit according to claim 2, wherein in the determination process, the statistic value in the first time slot or the third time slot is smaller than the reference value in the corresponding time slot. judgment device. In the determination process, the determination unit compares whether the statistical value in each time slot of the first time slot and the third time slot is smaller than the reference value in the corresponding time slot, and 4. The determination device according to claim 2, wherein a comparison is made as to whether or not said statistical value in a second time period is greater than said reference value in said second time period. 5. The judging unit according to any one of claims 2 to 4, wherein in the judging process, the statistical value in the second time period is compared with the reference value in the second time period. or the determination device according to item 1. The determination device according to any one of claims 3 to 5, wherein the determination unit determines the type of distortion of the power generation unit based on a comparison result in the determination process. wherein the determination unit determines at least one of distortion at the east edge, distortion at the west edge, and distortion at the central portion of the surface of the solar cell panel as the type of distortion of the power generation unit. Item 7. The determination device according to item 6. The determination unit determines a maximum value in one day of a maximum value among the power generation units, which is a maximum value among the plurality of power generation units, of the value based on the output current of the power generation unit, and a time of the maximum value among the power generation units. 8. The determination device according to any one of claims 1 to 7, wherein said determination processing is selectively performed for days on which a change in subject satisfies a predetermined condition. A determination method in a determination device used in a photovoltaic power generation system including a power generation unit including a solar cell panel,
a step of acquiring measurement information indicating a measurement result of the output current of the power generation unit;
Based on the acquired measurement information, values based on the output current of the target power generation unit, which is the power generation unit to be determined, are the first time zone, the second time zone, and the third time zone in chronological order of one day. calculating a statistical value that is a value in at least one of the time slots;
and performing a determination process of determining the distortion of the surface of the solar cell panel in the target power generation unit based on the calculated statistical value.

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