WO2019123883A1

WO2019123883A1 - Determining device, solar power generation system, determining method, and determining program

Info

Publication number: WO2019123883A1
Application number: PCT/JP2018/041672
Authority: WO
Inventors: 後藤勲; 下口剛史; 谷村晃太郎; 池上洋行
Original assignee: 住友電気工業株式会社
Priority date: 2017-12-22
Filing date: 2018-11-09
Publication date: 2019-06-27
Also published as: JPWO2019123883A1; DE112018006525T5; JP7157393B2; CN111566930A

Abstract

This determining device is provided with: an acquisition unit that acquires time-series output data, i.e., measurement results of an output of a power generation unit that includes a plurality of solar cells connected in series; and a determining unit that determines, on the basis of the output data acquired by means of the acquisition unit, abnormalities of respective solar cells.

Description

Judgment apparatus, photovoltaic power generation system, judgment method and judgment program

The present invention relates to a determination apparatus, a solar power generation system, a determination method, and a determination program.
This application claims priority based on Japanese Patent Application No. 2017-246522 filed on Dec. 22, 2017, the entire disclosure of which is incorporated herein.

Japanese Unexamined Patent Publication No. 2012-205078 (Patent Document 1) discloses the following monitoring system for solar power generation. That is, the monitoring system for solar power generation is a monitoring system for solar power generation that monitors the power generation status of the solar cell panel with respect to the solar power generation system that collects outputs from a plurality of solar cell panels and sends it to the power conversion device. A measuring device provided at a place where output electric paths from the plurality of solar cell panels are collected and measuring the amount of power generation of each solar cell panel, and connected to the measuring device; A lower communication device having a function of transmitting measurement data, an upper communication device having a function of receiving the measurement data transmitted from the lower communication device, and the solar cell panel via the upper communication device And a management device having a function of collecting each of the measurement data. The management apparatus determines the presence or absence of abnormality based on the difference in the amount of power generation at the same time point for each of the solar cell panels, or the maximum value or integration of the amount of power generation for a predetermined period of time for each of the solar cell panels Determine the presence or absence of abnormality based on the value.

Unexamined-Japanese-Patent No. 2012-205078

(1) The determination apparatus of the present disclosure includes an acquisition unit that acquires time-series output data that is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series, and the acquisition unit acquired by the acquisition unit And a determination unit that determines an abnormality of each of the plurality of solar cells based on the output data.

(4) A photovoltaic power generation system according to the present disclosure includes: one or more power generation units including a plurality of solar cells connected in series; a junction box for integrating output lines from the respective power generation units; A determination apparatus that acquires time-series output data that is a measurement result of an output of each power generation unit, and determines abnormality of each of the plurality of solar cells in the corresponding power generation unit based on the acquired output data And

(5) The determination method of the present disclosure is a determination method in a determination apparatus, which comprises: acquiring time series output data which is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series; Determining an abnormality of each of the plurality of solar cells based on the acquired output data.

(6) The determination program of the present disclosure is a determination program used in the determination apparatus, and the computer is configured to output time series output data as a measurement result of an output of a power generation unit including a plurality of solar cells connected in series. It is a program for functioning as an acquisition part to acquire and a judgment part which judges abnormalities of each of a plurality of photovoltaic cells based on the output data acquired by the acquisition part.

One aspect of the present disclosure can be implemented not only as a determination device including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the determination device.

Moreover, one aspect of the present disclosure can be realized not only as a photovoltaic power generation system including such a characteristic processing unit, but also as a method in which such characteristic processing is used as a step. In addition, one aspect of the present disclosure can be realized as a semiconductor integrated circuit that implements part or all of a solar power generation system.

FIG. 1 is a diagram showing a configuration of a solar power generation system according to an embodiment of the present invention. FIG. 2 is a diagram showing the configuration of the PCS unit according to the embodiment of the present invention. FIG. 3 is a diagram showing a configuration of a current collection unit according to the embodiment of the present invention. FIG. 4 is a view showing a configuration of a solar cell unit according to the embodiment of the present invention. FIG. 5 is a diagram showing a configuration of a power generation state determination system according to the embodiment of the present invention. FIG. 6 is a diagram showing a configuration of a monitoring device in the power generation state determination system according to the embodiment of the present invention. FIG. 7 is a diagram showing a configuration of a determination device in the power generation state determination system according to the embodiment of the present invention. FIG. 8 is a diagram showing an example of monitoring information held by the determination device in the power generation state determination system according to the embodiment of the present invention. FIG. 9 is a diagram showing an example of time-series output data acquired by the acquisition unit in the determination apparatus according to the embodiment of the present invention. FIG. 10: is a figure which shows an example of the output data of the time series of each photovoltaic cell isolate | separated in the determination apparatus which concerns on embodiment of this invention. FIG. 11 is a flowchart that defines an operation procedure when the determination apparatus according to the embodiment of the present invention performs abnormality determination of a solar battery cell.

In recent years, techniques for monitoring a solar power generation system to determine abnormalities have been developed.

[Problems to be solved by the present disclosure]
A technique capable of improving the accuracy of abnormality determination of a photovoltaic power generation system beyond the technique described in Patent Document 1 is desired.

The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to provide a determination device capable of improving the accuracy of abnormality determination of a solar power generation system, a solar power generation system, a determination method, and a determination program. To provide.

[Effect of the present disclosure]
According to the present disclosure, it is possible to improve the accuracy of abnormality determination of the solar power generation system.

Description of an embodiment of the present invention
First, the contents of the embodiment of the present invention will be listed and described.

(1) A determination apparatus according to an embodiment of the present invention includes an acquisition unit that acquires time-series output data that is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series; And a determination unit that determines an abnormality of each of the plurality of solar cells based on the output data acquired by

With such a configuration, for example, without installing a thermometer and a solar radiation meter which measure the temperature of the solar battery cell, the power generation state can be grasped in the unit of the solar battery cell finer than the unit for measuring the output of the power generation unit Since it is possible, it is possible to detect an abnormality of the power generation unit in more detail. Therefore, the accuracy of the abnormality determination of the solar power generation system can be improved.

(2) Preferably, the determination unit calculates, based on the output data acquired by the acquisition unit, time-series output data related to each output of the plurality of solar cells, and the calculated output data And determine the abnormality of the corresponding solar battery cell.

Thus, since the output of each photovoltaic cell can be grasped | ascertained by the structure which calculates the time-sequential output data regarding each output of a photovoltaic cell, abnormality can be detected more correctly.

(3) Preferably, the acquisition unit acquires, as the output data, the measurement result for each of the power generation units in a junction box that integrates output lines from one or more of the power generation units.

With such a configuration, the configuration for measuring the output of the power generation unit can be simplified.

(3) A photovoltaic power generation system according to an embodiment of the present invention includes one or more power generation units including a plurality of solar cells connected in series, and a junction box for consolidating output lines from the respective power generation units. Acquiring time series output data which is a measurement result of the output of each power generation unit in the junction box, and based on the acquired output data, each abnormality of the plurality of solar cells in the corresponding power generation unit And a determination device for determining

(4) The determination method according to the embodiment of the present invention is the determination method in the determination apparatus, which is time-series output data which is a measurement result of the output of the power generation unit including a plurality of solar cells connected in series. And acquiring the abnormality of each of the plurality of solar cells based on the acquired output data.

(5) The determination program according to the embodiment of the present invention is a determination program used in the determination device, and when the computer is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series. It is a program for functioning as an acquisition part which acquires a series of output data, and a judgment part which judges abnormalities of each of a plurality of photovoltaic cells based on the output data acquired by the acquisition part.

Hereinafter, embodiments of the present invention will be described using the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters and description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

[Configuration of photovoltaic system]
FIG. 1 is a diagram showing a configuration of a solar power generation system according to an embodiment of the present invention.

Referring to FIG. 1, a solar power generation system 401 includes four power conditioning subsystem (PCS) units 80 and a cubicle 6. The cubicle 6 includes a copper bar 73.

In FIG. 1, four PCS units 80 are representatively shown. The number of PCS units 80 is not limited to four, and a larger or smaller number of PCS units 80 may be provided.

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

Referring to FIG. 2, PCS unit 80 includes four current collecting units 60 and PCS (power conversion device) 8. The PCS 8 includes a copper bar 7 and a power converter 9.

In FIG. 2, four current collection units 60 are representatively shown. The number of current collection units 60 is not limited to four, and a larger or smaller number of current collection units 60 may be provided.

FIG. 3 is a diagram showing a configuration of a current collection unit according to the embodiment of the present invention.

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

In FIG. 3, four solar cell units 74 are representatively shown. The number of solar cell units 74 is not limited to four, and a larger or smaller number of solar cell units 74 may be provided.

FIG. 4 is a view showing a configuration of a solar cell unit according to the embodiment of the present invention.

Referring to FIG. 4, solar cell unit 74 includes four power generation units 78 and connection box 76. The power generation unit 78 has a solar battery cell. The junction box 76 has a copper bar 77.

In FIG. 4, four power generation units 78 are representatively shown. The number of power generation units 78 is not limited to four, and a larger or smaller number of power generation units 78 may be provided.

The power generation unit 78 is a string in which four

solar cells

79A, 79B, 79C, 79D are connected in series in this example. Hereinafter, each of

solar cell

79A, 79B, 79C, 79D is also called solar cell 79.

In FIG. 4, four solar cells 79 are representatively shown. The number of solar cells 79 is not limited to four, and a larger or smaller number of solar cells 79 may be provided.

In the solar power generation system 401, the output lines and the aggregation lines, ie, power lines from the plurality of power generation units 78 are electrically connected to the cubicle 6, respectively.

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

When receiving the 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.

Referring to FIGS. 3 and 4, integrated line 5 has a first end connected to copper bar 77 in the corresponding solar cell unit 74 and a second end connected to copper bar 72. Each aggregation line 5 is aggregated to the aggregation line 2 via the copper bar 72. Copper bar 72 is provided, for example, in the inside of current collection box 71.

With reference to FIGS. 1 to 4, in the photovoltaic power generation system 401, as described above, the output lines 1 from the plurality of power generation units 78 are aggregated into the aggregation line 5, and the aggregation lines 5 are aggregated into the aggregation line 2. And each aggregation line 2 is aggregated into an aggregation line 4. Each aggregation line 4 is electrically connected to the cubicle 6.

More specifically, each aggregation line 2 has a first end connected to the copper bar 72 in the corresponding current collection 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 conversion unit 9.

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

The aggregation line 4 has a first end connected to the power conversion unit 9 and a second end connected to the copper bar 73.

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

[Configuration of Power Generation State Determination System 301]
FIG. 5 is a diagram showing a configuration of a power generation state determination system according to the embodiment of the present invention.

Referring to FIG. 5, the solar power generation system 401 includes a power generation state determination system 301. The power generation state determination system 301 includes a determination device 101, a plurality of monitoring devices 111, and a collection device 151.

In FIG. 5, four monitoring devices 111 provided corresponding to one current collection unit 60 are representatively shown. The number of monitoring devices 111 is not limited to four, and a larger or smaller number of monitoring devices 111 may be provided. In addition, although the power generation state determination system 301 includes one collection device 151, a plurality of collection devices 151 may be included.

In the power generation state determination system 301, information of sensors in the monitoring device 111 which is a slave unit is periodically or irregularly transmitted to the collecting device 151.

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

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

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

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

aggregation lines

2 and 5.

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

[Configuration of Monitoring Device 111]
FIG. 6 is a diagram showing a configuration of a monitoring device in the power generation state determination system according to the embodiment of the present invention. In FIG. 6, the output line 1, the aggregate line 5 and the copper bar 77 are shown in more detail.

Referring to FIG. 6, output line 1 includes positive side output line 1p and negative side output line 1n. The consolidation line 5 includes a plus-side consolidation line 5p and a minus-side consolidation line 5n. The copper bar 77 includes a plus side copper bar 77p and a minus side copper bar 77n.

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

Positive side output line 1p has a first end connected to corresponding power generation unit 78 and a second end connected to positive side copper bar 77p. Negative side output line 1 n has a first end connected to corresponding power generation unit 78 and a second end connected to negative side copper bar 77 n.

The positive side aggregation line 5p has a first end connected to the positive side copper bar 77p and a second end connected to the positive side copper bar 72p in the current collection box 71. The minus side consolidation line 5n has a first end connected to the minus side copper bar 77n and a second end connected to the minus side copper bar 72n in the current collection 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. The monitoring device 111 may further include more or less current sensors 16 depending on the number of output lines 1.

Monitoring device 111 is provided, for example, in the vicinity of 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. The monitoring device 111 may be provided outside the connection box 76.

For example, the monitoring device 111 is electrically connected to the plus-side consolidation line 5p and the minus-side consolidation line 5n via the plus-side power supply line 26p and the minus-side power supply line 26n, respectively. Hereinafter, each of positive side power supply line 26p and negative side power supply line 26n is also referred to as power supply line 26.

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

In detail, the communication unit 14 in the monitoring device 111 can perform power line communication via the aggregation line with the collection device 151 that collects measurement results of the plurality of monitoring devices 111. More specifically, the communication unit 14 can transmit and receive information via the

aggregation lines

2 and 5. Specifically, the communication unit 14 performs power line communication with the collection device 151 via the power supply line 26 and the

aggregation lines

2 and 5.

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

The current sensor 16 is, for example, a Hall element type current probe, and measures the current of the output line 1. More specifically, the current sensor 16 measures the current flowing through the corresponding negative side output line 1 n using the power received from the power supply circuit (not shown) of the monitoring device 111, and detects the signal indicating the measurement result. Output to The current sensor 16 may measure the current flowing through the positive side output line 1p.

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

Detection processing unit 11 converts, for example, signals obtained by performing signal processing such as averaging and filtering on each measurement signal received from each current sensor 16 and voltage sensor 17 at predetermined time intervals, into a digital signal.

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

The monitoring information may include the calculated power. More specifically, detection processing unit 11 calculates the generated power corresponding to current sensor 16 by multiplying the measurement value of current sensor 16 by the measurement value of voltage sensor 17 for each current sensor 16, for example. And include the calculated generated power in the monitoring information.

The detection processing unit 11 creates a monitoring information packet whose transmission source ID is its own monitoring device ID, whose transmission destination ID is the ID of the collection device 151, and whose data portion is monitoring information. Then, the detection processing unit 11 outputs the created monitoring information packet to the communication unit 14. The detection processing unit 11 may include the 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 back to FIG. 5, the collection device 151 can transmit and receive information via the

aggregation lines

2 and 5. Specifically, for example, 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.

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

[Configuration and operation of determination device]
FIG. 7 is a diagram showing a configuration of a determination device in the power generation state determination system according to the embodiment of the present invention.

Referring to FIG. 7, the determination apparatus 101 includes a determination unit 81, a communication processing unit 84, a storage unit 85, and an acquisition unit 86.

In the storage unit 85 of the determination apparatus 101, for example, the ID of the monitoring apparatus 111 to be managed, that is, the monitoring apparatus ID is registered. Further, in the storage unit 85, the correspondence 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 collection device 151, and processes the acquired monitoring information. Determination device 101 may be configured to be incorporated in collection device 151, for example.

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

The communication processing unit 84 performs monitoring information collection processing at designated daily processing timing, for example, at midnight every day. If the determination device 101 is built in the collection device 151, monitoring information can be easily collected at shorter intervals.

More specifically, when the daily processing timing comes, the communication processing unit 84 refers to each monitoring device ID registered in the storage unit 85, corresponds to each monitoring device ID referred to, and performs 24 hours of daily processing timing. A monitoring information request for requesting monitoring information including the reception time belonging to the previous day processing timing (hereinafter also referred to as a processing day) is transmitted to the collection apparatus 151.

When receiving the monitoring information request 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 in accordance with the received monitoring information request.

FIG. 8 is a diagram showing an example of monitoring information held by the determination device in the power generation state determination system according to the embodiment of the present invention.

Referring to FIG. 8, when communication processing unit 84 receives one or more pieces of monitoring information from collection device 151 as a response to a monitoring information request, communication processing unit 84 stores the received monitoring information in storage unit 85 and also notifies processing completion. Are output to the acquisition unit 86.

The acquisition unit 86 acquires time-series output data that is a measurement result of the output of the power generation unit 78.

More specifically, when the acquisition unit 86 receives the process completion notification from the communication processing unit 84, the acquisition unit 86 refers to the correspondence R1 registered in the storage unit 85, and the time series of the current value and the voltage value included in the monitoring information. Output data for each current sensor ID is acquired from the storage unit 85 and output to the determination unit 81.

That is, the acquisition unit 86 acquires, as the output data, the measurement result for each of the power generation units 78 in the connection box 76 that aggregates output lines from the plurality of power generation units 78, and outputs the acquired output data to the determination unit 81.

FIG. 9 is a diagram showing an example of time-series output data acquired by the acquisition unit in the determination apparatus according to the embodiment of the present invention. FIG. 9 shows the current value I1 of the current sensor 16 whose current sensor ID shown in FIG. 8 is IDB1. In FIG. 9, the horizontal axis indicates time, and the vertical axis indicates current value.

Determination unit 81 calculates output data related to the output of each of the plurality of solar battery cells 79 based on the output data acquired by acquisition unit 86, and based on the calculated output data, the corresponding solar battery cells 79 Determine the abnormality.

More specifically, determination unit 81 determines, based on time series output data of power generation unit 78 received from acquisition unit 86 (hereinafter also referred to as string output data), a plurality of solar battery cells 79 in power generation unit 78. Output data (hereinafter also referred to as cell output data) related to each output of is calculated. Then, determination unit 81 determines an abnormality of corresponding solar battery cell 79 based on the calculated cell output data.

That is, for each power generation unit 78, the determination unit 81 separates string output data into time-series output data of each of the plurality of photovoltaic cells 79.

Specifically, time-series output data of the current value and the voltage value of each of the photovoltaic cells 79 is given, for example, as learning data from the user to determination unit 81. Then, the determination unit 81 estimates a parameter of the Hidden Markov Model from the given learning data using the Baum-Welch algorithm, and generates a Hidden Markov Model.

The determination unit 81 obtains each cell output data separated from the string output data by inputting the string output data received from the acquisition unit 86 into the generated hidden Markov model.

Then, the determination unit 81 classifies each obtained cell output data by performing clustering determination by machine learning using k-means, for example.

More specifically, determination unit 81 determines, for example, for each cell output data, the cell output data of

solar cell

79A, 79B, 79C based on the frequency indicated by the cell output data and the waveform of the cell output data. And 79D, which one of the output data corresponds to.

FIG. 10: is a figure which shows an example of the output data of the time series of each photovoltaic cell isolate | separated in the determination apparatus which concerns on embodiment of this invention.

Referring to FIG. 10, for example, the string output data whose current sensor ID is IDB1 is the cell output data of solar battery cell 79A, the cell output data of solar battery cell 79B, the cell output data of solar battery cell 79C and the solar battery It is separated into cell output data of the cell 79D.

In addition, as a method of separating string output data into cell output data, determination section 81 Hiroshi Okuno and two others, "Proposal of audio stream separation method and preliminary experiment of simultaneous recognition of plural voices," Information Processing Society of Japan Journal vol. 38, No. 3, March 1997, P.I. 510-523 (non-patent document 1) or Yukihiro Morita, 4 others, "Separation of speech of multiple speakers", Japanese Acoustical Society Kyushu Branch, 2nd Lecture for students, P. 27-30 (Non-Patent Document 2) or “Disaggregation to estimate power consumption of equipment”, NIKKEI ELECTRONICS, April 2015, P. The method described in 81-85 (Non-patent Document 4) may be used.

Then, the determination unit 81 calculates the generated power of each solar battery cell 79. More specifically, determination unit 81 calculates the generated power of each solar battery cell 79 by multiplying the current value and the voltage value of the obtained cell output data.

Determination unit 81 compares the calculated generated power of each solar battery cell 79 according to a predetermined method, and determines, for example, a small solar battery cell 79 of the generated power as abnormal.

More specifically, determination unit 81 calculates, for example, an average value of generated power of four solar battery cells 79, and determines that solar battery cell 79 having generated power smaller than the calculated average value by a predetermined value or more is abnormal.

Specifically, among the cell output data of each of the solar cells 79 shown in FIG. 10, the solar cell 79D has a smaller current value than the

solar cells

79A, 79B, 79C, and hence the generated power is the smallest.

Determination unit 81 determines that solar battery cell 79D is abnormal if the power generated by solar battery cell 79D is smaller than the average value of

solar battery cells

79A, 79B, 79C, 79D by a predetermined value or more.

Alternatively, the determination unit 81 may determine that among the solar battery cells 79, the solar battery cells 79 that are generated power smaller than the generated power of the solar battery cell 79 having the largest generated power by a predetermined value or more are abnormal.
[Flow of operation]
Each device in the power generation state determination system 301 includes a computer, and an arithmetic processing unit such as a CPU in the computer reads and executes a program including a part or all of each step of the following flowchart from a memory (not shown). The programs of the plurality of devices can be installed from the outside. The programs of the plurality of apparatuses are distributed as stored in the recording medium.

FIG. 11 is a flowchart that defines an operation procedure when the determination apparatus according to the embodiment of the present invention performs abnormality determination of a solar battery cell.

Referring to FIG. 11, determination apparatus 101 waits until the daily processing timing arrives (NO in step S101).

Then, when the daily processing timing arrives (YES in step S101), the determination device 101 receives the current value and the voltage value for each power generation unit 78 in the processing day from the collection device 151 (step S102).

Next, the determination device 101 separates, for each power generation unit 78, time-series data of the received current value, that is, string output data into cell output data of each solar battery cell 79 (step S103).

Next, the determination device 101 classifies cell output data of each of the separated photovoltaic cells 79. That is, the determination device 101 determines, for each of the separated cell output data, which photovoltaic cell 79 the output data corresponds to is output data (step S104).

Next, the determination device 101 calculates the generated power using the current value and the voltage value in the cell output data of each of the separated photovoltaic cells 79 (step S105).

Next, the determination device 101 compares the calculated generated power of each of the photovoltaic cells 79 to determine an abnormality (step S106).

Next, the determination apparatus 101 stands by until a new daily processing timing arrives (step S101).

In the determination apparatus according to the embodiment of the present invention, the determination unit 81 calculates cell output data of each solar battery cell 79 based on the string output data of the power generation unit 78, and the abnormality of each solar battery cell 79. Although it is described that the present invention is not limited to this. The determination unit 81 may be configured to determine the abnormality of each of the solar cells 79 from the string output data of the power generation unit 78 without calculating the cell output data of each of the solar cells 79.

Further, in the determination apparatus according to the embodiment of the present invention, the acquiring unit 86 is configured to acquire the measurement result of each power generation unit 78 in the connection box 76, but the present invention is not limited to this. The acquisition unit 86 may be configured to measure the current value and the voltage value in the current collection box 71, the PCS 8 or the cubicle 6, and acquire the measurement result.

Further, in the determination apparatus according to the embodiment of the present invention, the determination unit 81 is configured to compare the generated power of the respective solar battery cells 79 to determine an abnormality, but the present invention is not limited to this. The determination unit 81 may be configured to determine the abnormality by comparing the current value or the voltage value of each solar battery cell 79.

By the way, the technique which can improve the precision of abnormality determination of a solar energy power generation system beyond the technique of patent document 1 is desired.

In the determination apparatus according to the embodiment of the present invention, the acquisition unit 86 acquires time-series output data that is the measurement result of the output of the power generation unit 78 including the plurality of solar cells 79 connected in series. The determination unit 81 determines the abnormality of each of the plurality of solar cells 79 based on the output data acquired by the acquisition unit 86.

With such a configuration, for example, without installing a thermometer and a solar radiation meter measuring the temperature of the solar battery cell 79, the power generation state is grasped in units of the solar battery cell 79 finer than the unit for measuring the output of the power generation unit 78 Therefore, the abnormality of the power generation unit 78 can be detected in more detail.

Therefore, in the determination device according to the embodiment of the present invention, it is possible to improve the accuracy of the abnormality determination of the solar power generation system.

Further, in the determination apparatus according to the embodiment of the present invention, the determination unit 81 calculates, based on the output data acquired by the acquisition unit 86, time series output data regarding each output of the plurality of photovoltaic cells 79. Then, based on the calculated output data, the abnormality of the corresponding photovoltaic cell 79 is determined.

Thus, since the output of each photovoltaic cell 79 can be grasped by the configuration in which the time-series output data regarding the respective outputs of the photovoltaic cells 79 are calculated, it is possible to detect an abnormality more accurately.

Further, in the determination apparatus according to the embodiment of the present invention, the acquisition unit 86 acquires, as output data, the measurement result of each power generation unit 78 in the junction box 76 that combines output lines from one or more power generation units 78. .

With such a configuration, the configuration for measuring the output of the power generation unit 78 can be simplified.

Further, in the solar power generation system according to the embodiment of the present invention, connection box 76 integrates output lines from power generation units 78. The determination device 101 acquires time-series output data that is a measurement result of the output of each power generation unit 78 in the connection box 76, and based on the acquired output data, the plurality of photovoltaic cells 79 in the corresponding power generation unit 78. Determine each anomaly.

Therefore, in the solar power generation system according to the embodiment of the present invention, it is possible to improve the accuracy of the abnormality determination of the solar power generation system.

Further, in the determination method in the determination apparatus according to the embodiment of the present invention, first, time series output data which is a measurement result of the output of the power generation unit 78 including the plurality of solar cells 79 connected in series is acquired. Next, based on the acquired output data, the abnormality of each of the plurality of photovoltaic cells 79 is determined.

Therefore, in the determination method according to the embodiment of the present invention, it is possible to improve the accuracy of the abnormality determination of the solar power generation system.

It should be understood that the above embodiments are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

The above description includes the features described below.
[Supplementary Note 1]
An acquisition unit that acquires time-series output data that is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series;
A determination unit that determines an abnormality of each of the plurality of solar cells based on the output data acquired by the acquisition unit;
The power generation unit is a string in which a plurality of solar cells are connected in series,
The determination apparatus according to claim 1, wherein the output of the power generation unit is generated power, current or voltage of the power generation unit.

[Supplementary Note 2]
One or more power generation units including a plurality of solar cells connected in series;
A junction box for collecting output lines from each of the power generation units;
Acquiring time series output data which is the measurement result for each of the power generation units in the connection box;
A determination device that determines an abnormality of each of the plurality of solar cells in the corresponding power generation unit based on the acquired output data;
The power generation unit is a string in which a plurality of solar cells are connected in series,
The solar power generation system whose output of the said electric power generation part is the electric power generated by the said electric power generation part, an electric current, or a voltage.

1

output line

2, 4, 5 aggregate line 3 internal line 6 cubicle 7 copper bar 8 PCS
9 power conversion unit 14 communication unit 16 current sensor 17 voltage sensor 26 power supply line 60 current collection unit 71

current collection box

72, 73, 77 copper bar 74 solar battery unit 76 connection box 78 power generation unit 79 solar battery cell 80 PCS unit 81 judgment Unit 84 Communication processing unit 85 Storage unit 86 Acquisition unit 101 Determination device 111 Monitoring device 151 Collection device 301 Power generation state determination system 401 Solar power generation system

Claims

An acquisition unit that acquires time-series output data that is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series;
A determination unit that determines an abnormality of each of the plurality of solar cells based on the output data acquired by the acquisition unit;
The determination unit calculates, based on the calculated output data, time-series output data related to the output of each of the plurality of solar cells based on the output data acquired by the acquisition unit. The determination apparatus which determines the abnormality of the said photovoltaic cell.
The determination device according to claim 1, wherein the acquisition unit acquires, as the output data, the measurement result for each of the power generation units in a junction box that aggregates output lines from one or more of the power generation units.
One or more power generation units including a plurality of solar cells connected in series;
A junction box for collecting output lines from each of the power generation units;
The output data of time series which is the measurement result of the output of each power generation unit in the junction box is acquired, and each abnormality of the plurality of solar cells in the corresponding power generation unit is acquired based on the acquired output data. A determination device for determining
The determination apparatus calculates, based on the acquired output data, time-series output data regarding each output of the plurality of solar cells, and, based on the calculated output data, the corresponding photovoltaic cell Photovoltaic system to determine abnormalities.
It is a determination method in the determination apparatus, and
Acquiring time series output data which is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series;
Determining an abnormality of each of the plurality of solar cells based on the acquired output data.
In the step of determining the abnormality, time-series output data related to each of the plurality of solar cells is calculated based on the acquired output data, and the corresponding output is calculated based on the calculated output data. The judgment method which judges the abnormality of a photovoltaic cell.
A determination program used in the determination apparatus,
Computer,
An acquisition unit that acquires time-series output data that is a measurement result of an output of a power generation unit including a plurality of solar cells connected in series;
A determination unit that determines an abnormality of each of the plurality of solar cells based on the output data acquired by the acquisition unit;
A program to function as
The determination unit calculates, based on the calculated output data, time-series output data related to the output of each of the plurality of solar cells based on the output data acquired by the acquisition unit. The determination program which determines the abnormality of the said photovoltaic cell.