Theft prevention system, theft prevention method, and program

Abstract

To provide various techniques for preventing a theft of electric cables in a photovoltaic power generation facility.SOLUTION: There is provided a theft prevention system of electric cables in a photovoltaic power generation facility. The theft prevention system includes a power conditioner, a string part, and a processor. The power conditioner includes a resistance measurement part. The resistance measurement part can acquire measurement data. The measurement data is the data indicating a resistance value of a circuit including the string part. The string part includes a plurality of cell parts and is electrically connected to the power conditioner at least via the electric cables. The cell parts can acquire sunlight energy by conversion into a direct current. The processor acquires the measurement data from the resistance measurement part. Data related to a theft of the electric cables is output in response to a change in the resistance value indicated by the measurement data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anti-theft system, an anti-theft method, and a program. [Background technology]

[0002] As a conventional technique, there is known a technique for providing an anomaly detection system for photovoltaic power generation equipment that can reliably detect anomalies such as theft even at night, at low cost, and with a simple system configuration (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-131470 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, various techniques have been developed to prevent theft of electric cables in photovoltaic power generation facilities.

[0005] In view of the above circumstances, the present invention provides various techniques for preventing theft of electric cables in photovoltaic power generation facilities. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided an anti-theft system for an electric cable in a photovoltaic power generation facility. The anti-theft system includes a power conditioner, a string unit, and a processor. The power conditioner includes a resistance measurement unit. The resistance measurement unit is configured to be able to acquire measurement data. The measurement data is data indicating a resistance value of a circuit including the string unit. The string unit is configured to include a plurality of cell units and is electrically connected to the power conditioner at least via an electric cable, and the cell unit is configured to be able to convert solar energy into a direct current and acquire the same. The processor acquires the measurement data from the resistance measurement unit. Data regarding the theft of the electric cable is output according to a change in the resistance value indicated by the measurement data.

[0007] According to the present disclosure, it is possible to provide various techniques for preventing theft of electric cables in photovoltaic power generation facilities. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of a system configuration of an anti-theft system 1. FIG. [Diagram 2] 2 is a diagram illustrating an example of a hardware configuration of a power conditioner 20 and a client device 3. FIG. [Diagram 3] FIG. 2 is a diagram illustrating an example of an activity diagram according to the embodiment; [Figure 4] FIG. 1 is a diagram showing an overview of a photovoltaic power generation facility 2 according to the present embodiment. [Diagram 5] 13A and 13B are diagrams for explaining a technique for preventing theft of an electric cable in a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic features shown in the following embodiments can be combined with each other.

[0010] Incidentally, the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable recording medium, or may be provided so as to be downloadable from an external server, or may be provided so that the program is started on an external computer and its functions are realized on a client device (so-called cloud computing).

[0011] In addition, in this embodiment, the term "unit" may include, for example, a combination of hardware resources implemented by a circuit in the broad sense and software information processing that can be specifically realized by these hardware resources. In addition, in this embodiment, various information is handled, and this information is represented, for example, by physical values ​​of signal values ​​representing voltage and current, high and low signal values ​​as a binary bit collection consisting of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculation can be performed on the circuit in the broad sense.

[0012] In addition, a circuit in the broad sense is a circuit realized by at least appropriately combining a circuit, circuitry, a processor, a memory, etc. In other words, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.

[0013] 1. System configuration of anti-theft system 1 First, the system configuration of the anti-theft system 1 of this embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram showing an example of the system configuration of the anti-theft system 1. As shown in FIG. 1, the anti-theft system 1 includes a solar power generation facility 2, a client device 3, and a network N. The solar power generation facility 2 and the client device 3 are configured to be able to communicate with each other via the network N. There may be a plurality of solar power generation facilities 2 and client devices 3. The client device 3 is an example of an information processing device, and is not limited to this embodiment. The client device 3 may be any of a PC (Personal Computer), a tablet computer, a smartphone, and the like. Here, the system exemplified as the anti-theft system 1 is composed of one or more devices or components. Therefore, even the solar power generation facility 2 or the client device 3 alone is included in the system exemplified as the anti-theft system 1.

[0014] The photovoltaic power generation facility 2 is a facility capable of converting solar radiation into electrical energy and generating electricity. The photovoltaic power generation facility 2 includes at least a power conditioner 20. The power conditioner 20 is configured to be capable of converting a direct current acquired by a string unit 23 into an alternating current.

[0015] 2. Hardware Configuration Next, the hardware configuration of this embodiment will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the hardware configuration of the power conditioner 20 and the client device 3.

[0016] 2.1.Hardware configuration of the power conditioner 20 2, the power conditioner 20 includes a processor 201, a storage unit 202, a communication unit 203, a resistance measurement unit 204, a signal generation unit 205, and a signal detection unit 206, and these components are electrically connected via a communication bus inside the power conditioner 20. The power conditioner 20 executes processing according to the embodiment.

[0017] The processor 201 processes and controls the overall operation related to the power conditioner 20. The processor 201 is, for example, a central processing unit (CPU). The processor 201 reads out a predetermined program stored in the storage unit 202 and executes processing based on the program, thereby realizing various functions related to the power conditioner 20, for example, the processing shown in FIG. 3 described later. The processor 201 is not limited to being single, and may be implemented with multiple processors 201 for each function. Also, a combination of these may be used.

[0018] The storage unit 202 stores various information defined by the above description. This can be implemented, for example, as a storage device such as a solid state drive (SSD) that stores various programs and the like related to the power conditioner 20 executed by the processor 201, and as a memory such as a random access memory (RAM) that stores temporarily required information (arguments, arrays, etc.) related to the calculation of the programs. The storage unit 202 stores various programs and variables related to the power conditioner 20 executed by the processor 201, and data and the like used when the processor 201 executes processing based on the programs.

[0019] The communication unit 203 is preferably a wired communication means such as USB, IEEE1394, Thunderbolt (registered trademark), wired LAN network communication, etc., but may also include wireless LAN network communication, mobile communication such as LTE / 3G / 4G / 5G, BLUETOOTH (registered trademark) communication, etc. as necessary. In other words, it is more preferable to implement it as a collection of multiple communication means. In other words, the power conditioner 20 may communicate various information from the outside via the communication unit 203.

[0020] The resistance measurement unit 204 is configured to be able to acquire measurement data, and the measurement data is data indicating a resistance value of a circuit including the power conditioner 20 to the string unit 23 under normal conditions (a state in which the electric cable is not disconnected). Upon receiving an operation command from the processor 201, the resistance measurement unit 204 starts applying a voltage and measures a current value, thereby measuring a combined resistance of the entire circuit. The entire circuit is an electric circuit configured to include all the string units 23 electrically connected to the power conditioner 20, and is, for example, an electric circuit including at least the resistance measurement unit 204 of the power conditioner 20, the current collection box 21, the connection box 22, and the string unit 23. In the case of a photovoltaic power generation facility 2 that does not include the current collection box 21 or the connection box 22, the current collection box 21 or the connection box 22 is omitted.

[0021] The signal generating unit 205 is configured to generate a signal to be transmitted through the electric cable. The signal is configured of a continuous pulse wave or a continuous high-frequency wave defined by a voltage. The frequency and voltage value of the signal can be any value. That is, the waveform of the signal may be arbitrarily shaped according to an instruction from the processor 201. The signal branches at branching points provided in the power conditioner 20, the current collecting box 21, and the connection box 22 and travels. When the signal reaches an end of the electric cable C1, C2, C3, such as a broken part, it is reflected at the free end.

[0022] The signal detection unit 206 is configured to be able to acquire data on the reflected wave of the generated signal. The signal detection unit 206 is configured to be able to detect the signal reflected by the free end and acquire data on the voltage value of the reflected signal.

[0023] 2.2. Hardware configuration of client device 3 2, the client device 3 has a processor 31, a storage unit 32, a communication unit 33, an input unit 34, and an output unit 35, and these components are electrically connected inside the client device 3 via a communication bus. The client device 3 executes the process according to the embodiment. For the processor 31, the storage unit 32, and the communication unit 33 of the client device 3, please refer to the processor 201, the storage unit 202, and the communication unit 203 of the power conditioner 20. The client device 3 may be used by the owner of the solar power generation facility 2, or may be used by an employee of a company that sells the solar power generation facility 2 or the power conditioner 20.

[0024] The input unit 34 may be included in the housing of the client device 3 or may be externally attached. For example, the input unit 34 may be implemented as a touch panel integrated with the output unit 35. If it is a touch panel, the user can input a tap operation, a swipe operation, or the like. Of course, a switch button, a mouse, a keyboard, or the like may be adopted instead of the touch panel. That is, the input unit 34 accepts an input based on an operation performed by the user. The input is transferred as a command signal to the processor 31 via a communication bus, and the processor 31 can execute a predetermined control or calculation as necessary.

[0025] The output unit 35 can function as a display unit of the client device 3. The output unit 35 may be included in the housing of the client device 3 or may be externally attached. The output unit 35 displays a screen of a Graphical User Interface (GUI) that can be operated by a user. This is preferably implemented by using display devices such as a CRT display, a liquid crystal display, an organic EL display, and a plasma display depending on the type of the client device 3.

[0026] 3. Operation flow of the anti-theft system 1 An example of a preferable information processing executed by the anti-theft system 1 of this embodiment will be described. In this embodiment, when the electric cables C1, C2, and C3 are stolen, it is assumed that the criminal will cut the electric cables C1, C2, and C3. Therefore, in the electric circuit of this embodiment, a change occurs due to the cutting of the electric cables C1, C2, and C3.

[0027] In this specification, various pieces of information transmitted and received via the network N, the communication unit 203 and the communication unit 33 are stored in the storage unit 202 and the storage unit 32.

[0028] In this specification, the term "acquire" is a concept that includes both the manner in which data or the like is received from another device and the manner in which data or the like is generated by oneself.

[0029] 3.1. Overview of information processing Next, the information processing from the start of acquisition of measurement data to determining the states of the electric cables C1, C2, and C3 and outputting data related to the theft of the electric cables C1, C2, and C3 will be described with reference to Fig. 3. Fig. 3 is a diagram showing an example of an activity diagram according to this embodiment.

[0030] In A1, the processor 201 of the power conditioner 20 judges whether or not the switching condition is satisfied. The processor 201 starts acquiring measurement data from the resistance measuring unit 204 or the signal detecting unit 206 by satisfying a predetermined switching condition. This predetermined switching condition is a condition for starting measurement from the resistance measuring unit 204 or the signal detecting unit 206, and is a condition designed to be satisfied when the electric energy generated through the string unit 23 is small. For example, the predetermined switching condition is satisfied when the voltage caused by the power generation falls below a predetermined value range, when the time of sunset or sundown has passed, when the time set by the user has arrived, when the user switches at his / her own discretion, etc. This makes it possible to prevent a high voltage load from being applied to the theft-only circuit.

[0031] In A2, the processor 201 switches so as to electrically connect the string unit 23 to the theft-only circuit based on the instruction to switch the circuit. This theft-only circuit is a circuit that enables functions including the resistance measurement unit 204, the signal generation unit 205, and the signal detection unit 206.

[0032] At A3, the processor 201 acquires measurement data from the resistance measuring unit 204 or the signal detecting unit 206. In A4, the processor 201 determines whether or not an abnormality has occurred based on the measurement data. A3 and A4 will be described in detail with reference to FIG.

[0033] If the processor 201 determines in A5 that no abnormality has occurred, the process proceeds to A3. If the processor 201 determines that an abnormality has occurred, the process proceeds to A6. At A6, the processor 201 transmits, via the communication unit 203 and the network N, to the client device 3, a notification that an abnormality has occurred. At A7, the processor 31 of the client device 3 receives, via the network N and the communication unit 33, a notification from the power conditioner 20 that an abnormality has occurred. In A8, the processor 31 outputs a notification that an abnormality has occurred from the output unit 35. The form of the output may be an email, a telephone call, an instant message, or any other form that allows the user to recognize the output.

[0034] 3.2 Details of data processing Next, details of A3 and A4, which have not been described above, will be described with reference to Fig. 4. Fig. 4 is a diagram showing an outline of a photovoltaic power generation facility 2 in this embodiment. The photovoltaic power generation facility 2 in Fig. 4 includes a power conditioner 20, a current collection box 21, a connection box 22, and a string unit 23. The power conditioner 20 is as described above in Section "2.1".

[0035] The current collecting box 21 is for further collecting electricity collected by each of the multiple connection boxes 22. The current collecting box 21 includes a reverse current prevention diode 210. The reverse current prevention diode 210 is a diode that prevents a reverse current flow in the circuit.

[0036] The junction box 22 is for collecting the power generated via the string units 23. The junction box 22 is electrically connected to the multiple string units 23. The junction box 22 also includes a reverse current prevention diode 220. The reverse current prevention diode 220 is a diode that prevents a reverse current flow in the circuit.

[0037] The current collection box 21 and the connection box 22, or only the current collection box 21, may be omitted in the photovoltaic power generation facility 2. In that case, the string unit 23 is connected to the power conditioner 20 without going through the omitted device.

[0038] The string unit 23 is configured to electrically connect a plurality of panel units 230 in series.

[0039] The panel section 230 is configured to electrically connect a plurality of cluster sections 231 in series.

[0040] Each of the cluster units 231 is configured so that one cell string circuit 232 and one bypass circuit 234 correspond one-to-one.

[0041] The cell string circuit 232 is configured to electrically connect a plurality of (for example, 10 to 25) cell units 233 in series.

[0042] The cell unit 233 is configured to convert solar energy into direct current and acquire it. The cell unit 233 is a basic unit of parts that make up a solar cell. The cell unit 233 is electrically connected to the power conditioner 20 at least via an electric cable described later.

[0043] The bypass circuit 234 is electrically connected in parallel with the cell string circuit 232 and includes a bypass diode 235 .

[0044] The bypass diode 235 is configured as a diode that passes a current through the bypass circuit 234 when the cell string circuit 232 is broken or does not generate power and becomes a resistor. When the cell string circuit 232 is not short-circuited, the bypass diode 235 functions as a resistor as a whole circuit, and therefore the resistance value of the bypass diode 235 is measured by the resistance measuring unit 204. The bypass diode 235 is configured of a Schottky diode or the like.

[0045] The photovoltaic power generation facility 2 includes electric cables C1, C2, and C3. The electric cables C1, C2, and C3 are configured to be able to transmit a direct current generated in the cell unit 233 to the power conditioner 20 through at least the electric cables C1, C2, and C3. The electric cables C1, C2, and C3 are configured by a PV cable, a CV cable, an HCV cable, or the like.

[0046] The electric cables C1, C2, and C3 include, for example, an upstream electric cable C1, a midstream electric cable C2, and a downstream electric cable C3. The upstream electric cable C1 electrically connects the power conditioner 20 and the current collection box 21. The midstream electric cable C2 electrically connects the current collection box 21 and the junction box 22. The downstream electric cable C3 electrically connects the junction box 22 and the string section 23. In this case, the upstream electric cable C1 and the midstream electric cable C2 are examples of a first electric cable, and the downstream electric cable C3 is an example of a second electric cable.

[0047] When the solar power generation equipment 2 does not have a current collection box, the upstream electric cable electrically connects the power conditioner 20 and the junction box, and the downstream electric cable electrically connects the junction box and the string unit 23. When the solar power generation equipment 2 does not have a current collection box, the upstream electric cable is an example of a first electric cable, and the downstream electric cable is an example of a second electric cable. Also, when the solar power generation equipment 2 does not have a current collection box and a junction box, the electric cables electrically connect the power conditioner 20 and the string unit 23.

[0048] The processor 201 outputs data on the theft of the electric cable according to the change in the resistance value indicated by the measurement data. Specifically, the data on the theft of the electric cable is output from the change in the resistance value using the following three types of methods. Note that the data on the theft of the electric cable includes data indicating that the electric cable is highly likely to have been cut, data indicating that there is a high possibility that a suspicious person is present in the photovoltaic power generation facility 2, and the like. This makes it possible to output data on the theft of the electric cable from data on at least the resistance value of the entire circuit alone.

[0049] As a first method of using the resistance value, the fact that the resistance value changes temporarily and greatly when the electric cables C1, C2, and C3 are cut is utilized. For example, the processor 201 may determine that the electric cables have been cut when it detects that the resistance value changes temporarily and greatly. More specifically, for example, the processor 201 may output a notification that the electric cables have been cut when the resistance value temporarily diverges to infinity or when it detects that the resistance value temporarily becomes 0. In this way, by determining that at least the resistance value has changed significantly, data related to the theft of the electric cables can be output.

[0050] As a second method of using the resistance value, the change in the magnitude of the resistance value indicated by the measurement data depending on the cut locations of the electric cables C1, C2, and C3 is utilized. When the resistance value caused by the bypass diodes 235 included in the string unit 23 decreases, the processor 201 outputs data related to the theft of the electric cables C1, C2, and C3. For example, when the upstream electric cable C1 is cut, the processor 201 detects a decrease in the resistance value caused by the bypass diodes 235 included in all the string units. In this case, the processor 201 outputs data related to the theft of the upstream electric cable C1. In addition, when a certain midstream electric cable C2 is cut, the processor 201 detects a decrease in the resistance value caused by the bypass diodes 235 included in the multiple string units 23 that are subordinate to the junction box 22 for the junction box 22 subordinate to the midstream electric cable C2. In this case, the processor 201 outputs data related to the theft of the midstream electric cable C2. When a downstream electric cable C3 is cut, the processor 201 detects a decrease in resistance caused by the bypass diode 235 included in the string unit 23 subordinate to the downstream electric cable C3. In this case, the processor 201 outputs data related to the theft of the downstream electric cable C3. For example, when there are ten cluster units 231 subordinate to a certain junction box, and the resistance of the bypass diode included in each cluster unit 231 is 10Ω, when a downstream electric cable C3 is cut, the processor 201 detects a decrease in resistance of about 100Ω. This makes it possible to estimate which electric cable is likely to be stolen, based on data indicated by a resistance measuring unit provided in the power conditioner, without providing a similar device in the string unit 23, the junction box 22, or the like.

[0051] The first and second methods may be combined. For example, when the processor 201 detects a temporary large change in the resistance value and then detects a decrease in the resistance value caused by the bypass diode 235 included in any of the cell string circuits 232, the processor 201 may output data related to the theft of the electric cable.

[0052] As a third method for using the resistance value, it is possible to utilize the fact that it is assumed that multiple electric cables are cut when the electric cables are stolen. The processor 201 outputs data regarding the theft of the electric cables when a change in the resistance value exceeding a predetermined range (a change in the resistance value per bypass diode 235, per current collector box 21, per connection box 22, per string section 23, a change in the resistance value set by the user such as 100Ω or more, etc.) occurs a predetermined number of times (e.g., two or more times, but may also include only one time) within a predetermined time (e.g., within five minutes). This makes it possible to prevent erroneous detection more effectively than when theft is determined from only one location.

[0053] Next, an example of outputting data related to the theft of an electric cable by a signal will be described. First, the processor 201 generates a signal in the electric cable from the signal generating unit 205. The signal is reflected at a cut point of any of the electric cables C1, C2, and C3, and is input to the signal detecting unit 206. In the theft-only circuit of this embodiment, the signal is not reflected when there is no abnormality in the electric cable (normal state), and is reflected and detected by the signal detecting unit 206 when the electric cable is cut. The processor 201 acquires data of the reflected signal at the signal detecting unit 206. When the electric cable is broken at multiple branch destinations from the power conditioner 20 to the string unit 23, the processor 201 acquires data of multiple reflected signals. The processor 201 outputs data related to the theft of the electric cable based on the data of the reflected signal.

[0054] In an example using a signal, the disconnection location of the electric cable can also be specified. That is, the processor 201 may output data related to the theft of the electric cable based on data on the phase of the reflected signal, which changes depending on the location where an abnormality has occurred in the electric cable. For example, it is assumed that the signal generating unit 205 generates a continuous wave signal with a wavelength of 20 m. When the signal detecting unit 206 detects a signal with a wavelength phase shifted by 1 / 2 (λ / 2), the processor 201 determines that the power cable is disconnected at a location obtained by multiplying 10 m by an integer equal to or greater than 0 and adding 5 m from the power conditioner 20. In addition, when the disconnection location of the power cable cannot be specified by only one type of wavelength, the processor 201 may specify the disconnection location of the power cable by causing the signal generating unit 205 to generate a plurality of signals with different wavelengths. This makes it possible to output data related to whether the electric cable has been disconnected and the location where it has been disconnected.

[0055] According to the present disclosure, it is possible to provide various techniques for preventing theft of electric cables in photovoltaic power generation facilities.

[0056] [others] In the modified example, various techniques for preventing theft of an electric cable other than those described in the embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram for explaining the technique for preventing theft of an electric cable in the modified example. The solar power generation facility in the modified example includes a server device 4, a fence 5, and a resistance measurement unit 6. The server device 4 and the resistance measurement unit 6 are configured to be able to transmit and receive data to and from each other via a network N.

[0057] The server device 4 has a processor 41, a storage unit 42, and a communication unit 43, and these components are electrically connected via a communication bus inside the server device 4. The server device 4 executes the process according to the embodiment. For the processor 41, the storage unit 42, and the communication unit 43 of the server device 4, please refer to the processor 201, the storage unit 202, and the communication unit 203 of the power conditioner 20.

[0058] The fence 5 in the modified example includes a net portion 50 and an electric wire portion 51. The net portion 50 is configured by crossing wires in a mesh pattern to prevent people from passing through. The electric wire portion 51 is configured of a single-core or two-core electric wire, and is fixed to the net portion 50 with a cable tie or the like. The electric wire portion 51 may be installed on the ground at a location where a gate is located without being fixed to the net portion 50. The electric wire portion 51 is electrically connected to the resistance measurement portion 6. If the electric wire portion 51 is a two-core electric wire, the end may be short-circuited for earthing.

[0059] The resistance measuring unit 6 is configured to be able to acquire data indicating the resistance value of the electric wire part 51. Upon receiving an operation command from the processor 41, the resistance measuring unit 6 starts applying a voltage and measures a current value, thereby measuring the resistance of the electric wire part 51. The resistance measuring unit 6 has a function capable of communicating with the communication unit 43 of the server device 4 via the network N, and is configured to be able to transmit data indicating the resistance value to the server device 4.

[0060] The resistance measurement unit 6 has a function capable of communicating with the communication unit 43 of the server device 4 via the network N, and transmits data indicating the resistance value to the server device 4. Based on the data indicating the resistance value, when the processor 41 detects that the resistance value has diverged to infinity or that the resistance value has become 0, the processor 41 sends a notification to the client device 3 that there is a high possibility that the PV cable will be stolen.

[0061] [Appendix 1] An anti-theft system for an electric cable in a solar power generation facility, comprising: The device includes a fence unit, an electric wire unit, a resistance measuring unit, and a processor, The fence portion is configured to surround a solar power generation facility, The electric wire unit is configured to surround the solar power generation facility together with the fence unit, and at least a portion of the electric wire unit is fixed to the fence unit, The resistance measuring unit is configured to be able to measure a resistance value of the electric wire portion, The processor outputs data regarding the theft of the electric cable when it detects that the resistance value diverges to infinity or when it detects that the resistance value becomes zero. Anti-theft system.

[0062] [Appendix 2] 2. The anti-theft system according to claim 1, The electric wire portion is composed of a one-core or two-core electric wire. Anti-theft system.

[0063] The solar power plant includes an imaging unit 7. Various cameras are used for the imaging unit 7, such as a fixed camera and a PTZ (Panoramac Tilt Zoom) camera. In a solar power plant, the imaging unit 7 is preferably a PTZ camera, and the entire power plant is preferably monitored by sequentially enlarging the images using the PTZ camera. The imaging unit 7 is configured to be able to transmit image data to the server device 4. The image data may be digital data showing one or more images obtained by shooting, and may include either or both of still images and moving images. The form of the image data may be determined according to the file format of the image file generated by storing the image data, and is not limited to encoded data.

[0064] The processor 41 performs image processing on the image data acquired from the imaging unit 7. The processor 41 detects a predetermined situation based on the result of the image processing. The predetermined situation is a situation where there is a high possibility that the fence 5 may be broken, a situation where a suspicious person is seen, etc. The situation where there is a high possibility that the fence 5 may be broken is a situation where a suspicious person is detected to have a tool for breaking the fence such as a nipper, a situation where a movement of the suspicious person's joints is detected to break the fence 5, etc. The situation where a suspicious person is seen is a situation where a vehicle for taking out an electric cable such as a car or a motorcycle is detected, a situation where a suspicious person is detected to peer into the solar power generation facility from outside the fence 5, etc. The processor 41 transmits a notification to the client device 3 that these situations have been detected. The notification may include a photo or a short video. A machine learning algorithm such as a neural network (NN) may be used to detect the predetermined situation.

[0065] [Appendix 3] An anti-theft system for an electric cable in a solar power generation facility, comprising: An imaging unit and a processor, The imaging unit is configured to acquire image data by imaging a fence of the solar power generation facility, When the processor detects a predetermined situation based on the acquired image data, the processor outputs data related to the theft of the electric cable. Anti-theft system.

[0066] [Appendix 4] 4. The anti-theft system according to claim 3, The predetermined situation is a situation where there is a high possibility that the fence may be broken or a situation where a suspicious person is seen, etc. Anti-theft system.

[0067] The anti-theft method includes each process executed by the processor of the anti-theft system 1. The program is a program that causes a computer to function as the processor of the anti-theft system 1.

[0068] Furthermore, the present invention may be provided in the following manner.

[0069] (1) An anti-theft system for an electric cable in a solar power generation facility comprising: a power conditioner; a string unit; and a processor; the power conditioner comprises a resistance measuring unit, the resistance measuring unit is configured to be able to acquire measurement data, the measurement data being data indicating a resistance value of a circuit including the string unit, the string unit is configured to include a plurality of cell units and is electrically connected to the power conditioner at least via the electric cable, the cell units are configured to be able to acquire solar energy by converting it into direct current, and the processor acquires the measurement data from the resistance measuring unit and outputs data regarding the theft of the electric cable in accordance with a change in the resistance value indicated by the measurement data.

[0070] (2) In the anti-theft system described in (1) above, the processor outputs a notification that the electrical cable has been cut when the resistance value indicated by the measurement data diverges to infinity or when it detects that the resistance value has temporarily become zero.

[0071] (3) In the anti-theft system described in (1) above, the string unit includes a cell string circuit and a bypass circuit, the cell string circuit is configured to electrically connect a plurality of the cell units in series, the bypass circuit includes a bypass diode and is electrically connected in parallel with the cell string circuit, the bypass diode is configured as a diode that passes current through the bypass circuit when the cell string circuit is broken or does not generate power and becomes a resistance, and the processor outputs data regarding the theft of the electric cable when a resistance value caused by the bypass diode included in the string unit decreases.

[0072] (4) The anti-theft system described in (3) above, further comprising a junction box, wherein the electric cable includes a first electric cable and a second electric cable, the first electric cable electrically connects the power conditioner to one or more of the junction boxes at least via the first electric cable, and the second electric cable electrically connects the junction box to one or more of the string units at least via the second electric cable, and the processor outputs data regarding the theft of the first electric cable when it detects a decrease in resistance value caused by one or more bypass diodes included in a plurality of the string units subordinate to the power conditioner, and outputs data regarding the theft of the second electric cable when it detects a decrease in resistance value caused by one or more bypass diodes included in one of the string units.

[0073] (5) In the anti-theft system described in (1) above, the processor outputs data regarding the theft of the electric cable when a change in resistance value exceeding a predetermined range occurs a predetermined number of times within a predetermined time.

[0074] (6) In the anti-theft system described in (1) above, the processor starts acquiring the measurement data from the resistance measuring unit when a predetermined switching condition is satisfied, and the switching condition is that the voltage resulting from power generation falls below a predetermined value range.

[0075] (7) An anti-theft system for an electric cable in a solar power generation facility, comprising: a power conditioner, a cell unit, and a processor, wherein the power conditioner comprises a signal generating unit and a signal measuring unit, wherein the signal generating unit is configured to generate a signal that is transmitted through the electric cable, the signal measuring unit is configured to acquire data on reflected waves of the generated signal, the cell unit is configured to convert solar energy into a direct current and acquire the direct current, the electric cable is configured to transmit the direct current generated in the cell unit to the power conditioner at least through the electric cable, and the processor generates a signal from the signal generating unit into the electric cable, acquires data on the signal reflected through the electric cable at the signal measuring unit, and outputs data regarding the theft of the electric cable based on the data of the reflected signal.

[0076] (8) In the anti-theft system described in (7) above, the processor outputs data regarding the theft of the electric cable based on data on the phase of the reflected signal, which changes depending on the location where an abnormality has occurred in the electric cable.

[0077] (9) An anti-theft method, comprising each process executed by the processor of the anti-theft system described in any one of (1) to (8) above.

[0078] (10) A program for causing a computer to function as the processor of the anti-theft system according to any one of (1) to (8) above. Of course, this is not the case.

[0079] Finally, although various embodiments of the present invention have been described, these are presented as examples and are not intended to limit the scope of the invention. The novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The embodiments and their modifications are included within the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0080] 1: Anti-theft system 2: Solar power generation equipment 20: Power conditioner 201: Processor 202: Storage section 203: Communications Department 204: Resistance measurement unit 205: Signal generating section 206: Signal detection unit 22: Junction box 220: Reverse current prevention diode 23: String section 230: Panel section 231: Cluster section 232: Cell string circuit 233: Cell section 234: Bypass circuit 235: Bypass diode C1: Upstream electrical cable C2: Medium current electric cable C3: Downstream electric cable

Claims

1. An anti-theft system for an electric cable in a solar power generation facility, comprising: The power conditioner includes a power conditioner, a string unit, and a processor. The power conditioner includes a resistance measuring unit, The resistance measurement unit is configured to be able to acquire measurement data, the measurement data is data indicating a resistance value of a circuit including the string unit, The string unit is configured to include a plurality of cell units and is electrically connected to the power conditioner at least via the electric cable, The cell unit is configured to convert solar energy into direct current and obtain the direct current, The processor, acquiring the measurement data from the resistance measuring unit; outputting data related to the theft of the electric cable in response to a change in the resistance value indicated by the measurement data; Anti-theft system.

2. 2. The anti-theft system according to claim 1, When the processor detects that the resistance value indicated by the measurement data diverges to infinity or that the resistance value temporarily becomes zero, the processor outputs a notification that the electric cable has been cut. Anti-theft system.

3. 2. The anti-theft system according to claim 1, the string unit includes a cell string circuit and a bypass circuit, the cell string circuit is configured to electrically connect a plurality of the cell units in series, the bypass circuit includes a bypass diode and is electrically connected in parallel with the cell string circuit; the bypass diode is configured as a diode that passes a current through the bypass circuit when the cell string circuit is disconnected or does not generate power and becomes a resistor; The processor outputs data related to the theft of the electric cable when a resistance value caused by the bypass diode included in the string unit decreases. Anti-theft system.

4. 4. The anti-theft system according to claim 3, Equipped with a junction box, The electrical cable includes a first electrical cable and a second electrical cable, The first electric cable electrically connects the power conditioner and one or more of the connection boxes via at least the first electric cable, the second electric cable electrically connects the connection box and one or more of the string units via at least the second electric cable; The processor, When detecting a decrease in resistance value caused by one or more bypass diodes included in the plurality of string units subordinate to the power conditioner, outputting data related to the theft of the first electric cable; when detecting a decrease in resistance value caused by one or more bypass diodes included in one of the string units, outputting data related to the theft of the second electric cable. Anti-theft system.

5. 2. The anti-theft system according to claim 1, the processor outputs data related to the theft of the electric cable when a change in resistance value exceeding a predetermined range occurs a predetermined number of times within a predetermined time. Anti-theft system.

6. 2. The anti-theft system according to claim 1, The processor starts acquiring the measurement data from the resistance measurement unit when a predetermined switching condition is satisfied, the switching condition being that a voltage caused by power generation falls below a predetermined value range. Anti-theft system.

7. An anti-theft system for an electric cable in a solar power generation facility, comprising: The power conditioner includes a cell unit and a processor. The power conditioner includes a signal generating unit and a signal measuring unit, The signal generating unit is configured to generate a signal to be transmitted through the electric cable, The signal measurement unit is configured to be able to acquire data on a reflected wave of the generated signal, The cell unit is configured to convert solar energy into direct current and obtain the direct current, The electric cable is configured to transmit the DC current generated in the cell unit to the power conditioner at least through the electric cable, The processor, generating a signal from the signal generating unit into the electric cable; The signal measurement unit acquires data of the signal reflected through the electric cable, outputting data related to the theft of the electric cable based on data of the reflected signal; Anti-theft system.

8. 8. The anti-theft system according to claim 7, The processor outputs data related to the theft of the electric cable based on data of the phase of the reflected signal, the phase data changing depending on the location of the abnormality in the electric cable. Anti-theft system.

9. 1. An anti-theft method, comprising: The anti-theft system according to any one of claims 1 to 8, further comprising: Anti-theft methods.

10. A program, A program for causing a computer to function as the processor of the anti-theft system according to any one of claims 1 to 8.

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