Deterioration detection system, deterioration detection device, and deterioration detection method

Abstract

A deterioration detection system according to the present disclosure comprises: an optical fiber (10) laid along a wind turbine (30) for power generation; a communication unit (21) which transmits pulsed light to the optical fiber (10) and receives, from the optical fiber (10), an optical signal including information indicating vibration of the wind turbine; and a detection unit (22) which detects deterioration of the wind turbine (30) on the basis of the information included in the optical signal indicating the vibration of the wind turbine (30).

Description

[Technical Field]

[0001] The present disclosure relates to a deterioration detection system, a deterioration detection device, and a deterioration detection method for detecting deterioration of a power-generating wind turbine. [Background technology]

[0002] In recent years, development of offshore wind power generation has been progressing. In offshore wind power generation, wind turbines are installed offshore to generate electricity. On the other hand, in recent years, development has been progressing on a technology called optical fiber sensing, which uses optical fibers as sensors. One example of a technology for optical fiber sensing in the ocean is the technology disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2020-508464 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, in offshore wind power generation, the wind turbines used to generate power are installed offshore. Therefore, there is a demand for remote monitoring of wind turbines from land, etc., using optical fiber sensing, which enables remote monitoring, and for detecting deterioration of the wind turbines. However, the technology disclosed in Patent Document 1 is a technology for monitoring the buried state of undersea power cables or remote communication cables, and is not capable of detecting deterioration of wind turbines.

[0005] In view of the above-mentioned problems, an object of the present disclosure is to provide a deterioration detection system, a deterioration detection device, and a deterioration detection method that are capable of detecting deterioration of a wind turbine using optical fiber sensing. [Means for solving the problem]

[0006] A deterioration detection system according to one aspect includes: Optical fiber laid alongside wind turbines for power generation, a communication unit that transmits pulsed light to the optical fiber and receives an optical signal containing information indicating vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Equipped with.

[0007] A deterioration detection device according to one aspect includes: a communication unit that transmits pulsed light to an optical fiber laid along the power-generating wind turbine and receives an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Equipped with.

[0008] A deterioration detection method according to one aspect includes: A deterioration detection method using a deterioration detection device, a communication step of transmitting pulsed light to an optical fiber laid along the power-generating wind turbine and receiving an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection step of detecting deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Includes. [Effects of the Invention]

[0009] According to the above-described aspects, it is possible to provide an effect of providing a deterioration detection system, a deterioration detection device, and a deterioration detection method that are capable of detecting deterioration of a wind turbine by optical fiber sensing. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of the configuration of a deterioration detection system according to a first embodiment. [Figure 2]FIG. 3 is a diagram showing an example of a correspondence table according to the first embodiment. [Figure 3] 3 is a flowchart showing an example of a schematic operation flow of the deterioration detection system according to the first embodiment. [Figure 4] FIG. 10 is a diagram illustrating an example of the configuration of a deterioration detection system according to a second embodiment. [Figure 5] 10 is a flowchart showing an example of a schematic operation flow of a deterioration detection system according to a second embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of the configuration of a deterioration detection system according to another embodiment. [Figure 7] FIG. 10 is a diagram illustrating another example of the configuration of a deterioration detection system according to another embodiment. [Figure 8] FIG. 10 is a diagram illustrating an example of a correspondence table according to another embodiment. [Figure 9] FIG. 10 is a block diagram illustrating an example of the hardware configuration of a computer that realizes a deterioration detection device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the following description and drawings have been omitted and simplified as appropriate for clarity of explanation. In addition, in the following drawings, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary.

[0012] <First Embodiment> First, with reference to FIG. 1, a configuration example of a deterioration detection system according to the first embodiment will be described. As shown in Fig. 1, the deterioration detection system according to the first embodiment detects deterioration of a power-generating wind turbine 30 used in offshore wind power generation and the like, and includes an optical fiber 10, a communication unit 21, and a detection unit 22. Note that Fig. 1 assumes that the communication unit 21 and the detection unit 22 are provided separately. The detection unit 22 may be provided in a device separate from the communication unit 21, or may be provided on the cloud.

[0013] The wind turbine 30 shown in FIG. 1 has a structure in which blades 32 and the like are assembled on a tower housing 31. When wind strikes the blades 32, the blades 32 rotate, and the rotation is transmitted to a speed increaser (not shown) via a rotating shaft 33 of the blades 32. The speed increaser amplifies the rotational energy of the rotation, and then a generator (not shown) converts the rotational energy into electrical energy. The power generated by the wind turbine 30 in this way is transmitted to an onshore power grid (not shown) via a power transmission cable 40 connected to the generator. However, the structure of the wind turbine 30 shown in FIG. 1 is just an example, and the structure of the wind turbine 30 is not limited to this.

[0014] In the area surrounding the wind turbine 30, the optical fiber 10 is laid along the tower housing 31 of the wind turbine 30. In the area outside the wind turbine 30, the optical fiber 10 is laid or buried on the seabed along the power transmission cable 40. One end of the optical fiber 10 is connected to the communication unit 21.

[0015] The communication unit 21 transmits pulsed light to the optical fiber 10. Then, backscattered light is generated as the pulsed light is transmitted through the optical fiber 10. The communication unit 21 receives the backscattered light from the optical fiber 10 as an optical signal.

[0016] The detection unit 22 can identify the position where the optical signal was generated (the distance of the optical fiber 10 from the communication unit 21) based on the time difference between the time when the pulsed light was transmitted from the communication unit 21 to the optical fiber 10 and the time when the optical signal was received by the communication unit 21 from the optical fiber 10. Therefore, the detection unit 22 can identify the optical signal generated by the wind turbine 30 by comparing the position where the optical signal was generated with a correspondence table such as that shown in Fig. 2. The correspondence table of Fig. 2 may be stored in advance in a memory or the like (not shown).

[0017] As described above, when generating power, the blades 32 of the wind turbine 30 rotate, and vibrations are generated due to the influence of this rotation. The vibrations generated by the wind turbine 30 are transmitted to the optical fiber 10. As a result, the characteristics (for example, wavelength) of the optical signal transmitted through the optical fiber 10 change.

[0018] Therefore, the detection unit 22 can detect the vibration of the wind turbine 30 by analyzing the characteristics of the optical signal generated by the wind turbine 30 among the optical signals received by the communication unit 21. This means that the optical signal generated by the wind turbine 30 contains information indicating the vibration of the wind turbine 30.

[0019] Here, the vibration state of the vibrations generated by the wind turbine 30 differs depending on whether the wind turbine 30 is deteriorated or not. Therefore, the detector 22 detects deterioration of the wind turbine 30 based on information indicating vibration of the wind turbine 30 that is included in the optical signal generated by the wind turbine 30 among the optical signals received by the communication unit 21.

[0020] An example of a method for detecting deterioration of the wind turbine 30 in the detection unit 22 will be described below. When the wind turbine 30 deteriorates, the amount of power generated falls outside a predetermined range, and the frequency of vibrations generated by the wind turbine 30 also fluctuates. Here, frequency means the number of vibrations per unit time. Therefore, it is believed that the amount of power generated by the wind turbine 30 is highly correlated with the frequency of the wind turbine 30.

[0021] Therefore, the detection unit 22 uses training data indicating the amount of power generated by the wind turbine 30 and the frequency of vibrations generated by the wind turbine 30 at that time to learn in advance the correspondence relationship between the amount of power generated by the wind turbine 30 and the frequency of vibrations generated by the wind turbine 30. At this time, the amount of power generated for the training data is measured on the wind turbine 30 side. The frequency for the training data is derived by the detection unit 22 by analyzing information indicating the vibrations of the wind turbine 30 that is included in the optical signal. Note that the detection unit 22 may use a learning model based on, for example, a convolutional neural network (CNN) during the above-mentioned learning. In this case, the learning model may be stored in advance in a memory (not shown) or the like.

[0022] When detecting deterioration of the wind turbine 30, the detection unit 22 first derives the frequency of the vibrations generated by the wind turbine 30 based on information indicating the vibrations of the wind turbine 30 that is included in the optical signal generated by the wind turbine 30. Next, the detection unit 22 derives the amount of power generation that corresponds to the derived frequency from a pre-learned correspondence. Next, the detection unit 22 determines whether the derived amount of power generation is outside a predetermined range, and if it is outside the predetermined range, determines that the wind turbine 30 has deteriorated.

[0023] Next, with reference to FIG. 3, an example of a schematic flow of operations of the deterioration detection system according to the first embodiment will be described. As shown in FIG. 3, first, the communication unit 21 transmits pulsed light to the optical fiber 10 (step S11), and receives backscattered light corresponding to the pulsed light from the optical fiber 10 as an optical signal (step S12).

[0024] Thereafter, the detection unit 22 detects deterioration of the wind turbine 30 based on information indicating vibration of the wind turbine 30 that is included in the optical signal generated by the wind turbine 30 among the optical signals received by the communication unit 21 (step S13). At this time, the method of detecting deterioration of the wind turbine 30 may be a method that uses the correspondence relationship between the amount of power generated by the wind turbine 30 and the frequency of vibration, as described above.

[0025] As described above, according to the first embodiment, the communication unit 21 transmits pulsed light to the optical fiber 10, and receives backscattered light corresponding to the pulsed light as an optical signal from the optical fiber 10. The detection unit 22 detects deterioration of the wind turbine 30 based on information indicating vibrations of the wind turbine 30, which information is included in the optical signal received by the communication unit 21. This makes it possible to remotely monitor the wind turbine 30 on land, etc., and detect deterioration of the wind turbine 30 by optical fiber sensing.

[0026] <Embodiment 2> Next, with reference to FIG. 4, an example of the configuration of a deterioration detection system according to the second embodiment will be described.

[0027] As shown in FIG. 4, the deterioration detection system according to the second embodiment differs from the configuration of the first embodiment shown in FIG. 1 in that a notification unit 23 is added.

[0028] When the detection unit 22 determines that the wind turbine 30 has deteriorated, the notification unit 23 notifies a predetermined notification destination that the wind turbine 30 has deteriorated. The predetermined notification destination may be, for example, a terminal installed at the electric power company that manages the wind turbine 30, or a terminal carried by a responsible worker at the electric power company. The notification method may be, for example, a method of displaying a GUI (Graphical User Interface) screen on a display or monitor of the notification destination terminal, or a method of outputting an audio message from a speaker of the notification destination terminal.

[0029] Next, with reference to FIG. 5, an example of a schematic flow of operations of the deterioration detection system according to the second embodiment will be described. As shown in FIG. 5, first, the processes of steps S21 to S23, which are similar to steps S11 to S13 in FIG. 3 of the first embodiment, are performed. In step S23, if the detection unit 22 determines that the wind turbine 30 has deteriorated (Yes in step S23), the notification unit 23 notifies a predetermined notification destination that the wind turbine 30 has deteriorated (step S24).

[0030] As described above, according to the second embodiment, when the detection unit 22 determines that the wind turbine 30 has deteriorated, the notification unit 23 notifies a predetermined notification destination that the wind turbine 30 has deteriorated. This makes it possible to notify the power company or the like that manages the wind turbine 30 that the wind turbine 30 has deteriorated. Other effects are the same as those of the first embodiment described above.

[0031] <Other embodiments> In the above-described embodiment, the communication unit 21 and the detection unit 22 are provided separately, but this is not limiting. The communication unit 21 and the detection unit 22 may be provided in the same device. Fig. 6 shows an example configuration of a deterioration detection system in which the communication unit 21 and the detection unit 22 are provided inside the deterioration detection device 20. Note that the deterioration detection system shown in Fig. 6 may also include an alarm unit 23 inside the deterioration detection device 20, as in the second embodiment described above.

[0032] Although the embodiment described above monitors only one wind turbine 30, multiple wind turbines 30 may be monitored. FIG. 7 illustrates a configuration example of a deterioration detection system that detects deterioration of each of two wind turbines, 30A and 30B. In the deterioration detection system illustrated in FIG. 7, the detector 22 can identify the optical signals generated by the wind turbines 30A and 30B by comparing them with a correspondence table such as that illustrated in FIG. 8. Therefore, the detector 22 detects deterioration of the wind turbine 30A based on information indicating the vibration of the wind turbine 30A contained in the optical signal generated by the wind turbine 30A, and detects deterioration of the wind turbine 30B based on information indicating the vibration of the wind turbine 30B contained in the optical signal generated by the wind turbine 30B. The correspondence table illustrated in FIG. 8 may be stored in advance in a memory (not illustrated) or the like. The deterioration detection system illustrated in FIG. 8 may also include a notification unit 23 within the deterioration detection device 20.

[0033] In the above-described embodiment, the optical fiber 10 is laid or buried along the power transmission cable 40 in areas other than the wind turbine 30. Therefore, vibrations generated in the power transmission cable 40 are also transmitted to the optical fiber 10. Therefore, optical signals generated at positions along the power transmission cable 40 contain information indicating the vibration of the power transmission cable 40. The detection unit 22 can identify the optical signals generated at positions along the power transmission cable 40 by checking correspondence tables such as those shown in FIG. 2 and FIG. 8. The vibration state of the vibrations generated in the power transmission cable 40 also differs depending on whether the power transmission cable 40 is deteriorated. Therefore, the detection unit 22 may detect deterioration of the power transmission cable 40 based on information indicating the vibration of the power transmission cable 40, which is contained in the optical signals generated at positions along the power transmission cable 40.

[0034] For example, the detection unit 22 preliminarily derives a normal range of the frequency of vibrations generated in the power transmission cable 40. When detecting deterioration of the power transmission cable 40, the detection unit 22 first derives the frequency of the vibrations generated in the power transmission cable 40 based on information indicating the vibrations of the power transmission cable 40 that is contained in an optical signal generated at a position along the power transmission cable 40. Next, the detection unit 22 determines whether the derived frequency is outside the preliminarily derived normal range, and if it is outside the normal range, determines that the power transmission cable 40 has deteriorated.

[0035] <Hardware configuration of the deterioration detection device according to the embodiment> Next, with reference to FIG. 9, an example of the hardware configuration of a computer 50 that realizes the deterioration detection device 20 according to the above-described other embodiment (FIG. 6) will be described.

[0036] 9, the computer 50 includes a processor 51, a memory 52, a storage 53, an input / output interface (input / output I / F) 54, and a communication interface (communication I / F) 55. The processor 51, the memory 52, the storage 53, the input / output interface 54, and the communication interface 55 are connected by a data transmission path for transmitting and receiving data to and from each other.

[0037] The processor 51 is, for example, an arithmetic processing device such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 52 is, for example, a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The storage 53 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. The storage 53 may also be a memory such as a RAM or a ROM.

[0038] A program is stored in the storage 53. When the program is loaded into a computer, it includes a set of instructions (or software code) that causes the computer 50 to perform one or more functions of the deterioration detection device 20 described above. The components of the deterioration detection device 20 described above may be realized by the processor 51 reading and executing a program stored in the storage 53. Furthermore, the storage function of the deterioration detection device 20 described above may be realized by the memory 52 or the storage 53.

[0039] The above-described programs may also be stored on non-transitory computer-readable media or tangible storage media. By way of example and not limitation, computer-readable media or tangible storage media include RAM, ROM, flash memory, SSD or other memory technology, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc), Blu-ray® disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices. The programs may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagated signals.

[0040] The input / output interface 54 is connected to a display device 541, an input device 542, a sound output device 543, etc. The display device 541 is a device that displays a screen corresponding to drawing data processed by the processor 51, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor. The input device 542 is a device that accepts operational inputs from an operator, such as a keyboard, a mouse, or a touch sensor. The display device 541 and the input device 542 may be integrated and realized as a touch panel. The sound output device 543 is a device that outputs sound corresponding to audio data processed by the processor 51, such as a speaker.

[0041] The communication interface 55 transmits and receives data to and from an external device. For example, the communication interface 55 communicates with the external device via a wired communication path or a wireless communication path.

[0042] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure.

[0043] For example, some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes. (Appendix 1) Optical fiber laid alongside wind turbines for power generation, a communication unit that transmits pulsed light to the optical fiber and receives an optical signal containing information indicating vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; A deterioration detection system comprising: (Appendix 2) the optical fiber is laid along a tower housing of the wind turbine. 10. The deterioration detection system of claim 1. (Appendix 3) The detection unit A correspondence relationship between the amount of power generated by the wind turbine and its frequency is learned in advance; deriving a frequency of vibrations generated in the wind turbine based on information indicating the vibrations of the wind turbine; determining that the wind turbine has deteriorated when the amount of power generation corresponding to the frequency of vibrations generated in the wind turbine falls outside a predetermined range; 3. The deterioration detection system according to claim 1 or 2. (Appendix 4) In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. 4. The deterioration detection system according to any one of claims 1 to 3. (Appendix 5) the detection unit further detects deterioration of the power transmission cable based on information indicating vibration of the power transmission cable, the information being included in the optical signal. 10. The deterioration detection system of claim 4. (Appendix 6) the optical fiber is laid along the plurality of wind turbines, the detection unit detects deterioration of each of the plurality of wind turbines based on information indicating vibration of each of the plurality of wind turbines, the information being included in the optical signal; 6. The deterioration detection system according to any one of appendices 1 to 5. (Appendix 7) The wind turbine may further include a notification unit that notifies a predetermined notification destination that the wind turbine has deteriorated when the detection unit determines that the wind turbine has deteriorated. 7. The deterioration detection system according to any one of claims 1 to 6. (Appendix 8) a communication unit that transmits pulsed light to an optical fiber laid along the power-generating wind turbine and receives an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; A deterioration detection device comprising: (Appendix 9) the optical fiber is laid along a tower housing of the wind turbine. 9. The deterioration detection device according to claim 8. (Appendix 10) The detection unit A correspondence relationship between the amount of power generated by the wind turbine and its frequency is learned in advance; deriving a frequency of vibrations generated in the wind turbine based on information indicating the vibrations of the wind turbine; determining that the wind turbine has deteriorated when the amount of power generation corresponding to the frequency of vibrations generated in the wind turbine falls outside a predetermined range; 10. The deterioration detection device according to claim 8 or 9. (Appendix 11) In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. 11. A deterioration detection device according to any one of appendices 8 to 10. (Appendix 12) the detection unit further detects deterioration of the power transmission cable based on information indicating vibration of the power transmission cable, the information being included in the optical signal. 12. The deterioration detection device of claim 11. (Appendix 13) the optical fiber is laid along the plurality of wind turbines, the detection unit detects deterioration of each of the plurality of wind turbines based on information indicating vibration of each of the plurality of wind turbines, the information being included in the optical signal; 13. The deterioration detection device according to any one of appendices 8 to 12. (Appendix 14) The wind turbine may further include a notification unit that notifies a predetermined notification destination that the wind turbine has deteriorated when the detection unit determines that the wind turbine has deteriorated. 14. The deterioration detection device according to any one of appendixes 8 to 13. (Appendix 15) A deterioration detection method using a deterioration detection device, a communication step of transmitting pulsed light to an optical fiber laid along the power-generating wind turbine and receiving an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection step of detecting deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; A deterioration detection method comprising: (Appendix 16) the optical fiber is laid along a tower housing of the wind turbine. 16. The degradation detection method of claim 15. (Appendix 17) In the detecting step, A correspondence relationship between the amount of power generated by the wind turbine and its frequency is learned in advance; deriving a frequency of vibrations generated in the wind turbine based on information indicating the vibrations of the wind turbine; determining that the wind turbine has deteriorated when the amount of power generation corresponding to the frequency of vibrations generated in the wind turbine falls outside a predetermined range; 17. The degradation detection method according to claim 15 or 16. (Appendix 18) In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. 18. A deterioration detection method according to any one of appendices 15 to 17. (Appendix 19) the detecting step further detects deterioration of the power transmission cable based on information indicating vibration of the power transmission cable that is included in the optical signal. 19. The degradation detection method of claim 18. (Appendix 20) the optical fiber is laid along the plurality of wind turbines, In the detection step, deterioration of each of the plurality of wind turbines is detected based on information indicating vibration of each of the plurality of wind turbines, the information being included in the optical signal. 20. A degradation detection method according to any one of appendices 15 to 19. (Appendix 21) The system further includes a notification step of, when it is determined that the wind turbine has deteriorated in the detection step, notifying a predetermined notification destination that the wind turbine has deteriorated. 21. A deterioration detection method according to any one of appendices 15 to 20. [Explanation of symbols]

[0044] 10 Optical Fiber 20 Deterioration detection device 21 Communications Department 22 Detection unit 23 Information Department 30,30A,30B windmill 31 Tower Case 32 blades 33 Rotation axis 40 Power Transmission Cable 50 Computers 51 processors 52 memory 53 Storage 54 Input / Output Interface 541 Display device 542 Input Device 543 Sound Output Device 55 Communication Interface

Claims

1. Optical fiber laid alongside wind turbines for power generation, a communication unit that transmits pulsed light to the optical fiber and receives an optical signal containing information indicating vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Equipped with In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. Deterioration detection system.

2. the optical fiber is laid along a tower housing of the wind turbine. The deterioration detection system according to claim 1 .

3. a communication unit that transmits pulsed light to an optical fiber laid along the power-generating wind turbine and receives an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection unit that detects deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Equipped with In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. Deterioration detection device.

4. the optical fiber is laid along a tower housing of the wind turbine. The deterioration detection device according to claim 3 .

5. The detection unit A correspondence relationship between the amount of power generated by the wind turbine and its frequency is learned in advance; deriving a frequency of vibrations generated in the wind turbine based on information indicating the vibrations of the wind turbine; determining that the wind turbine has deteriorated when the amount of power generation corresponding to the frequency of vibrations generated in the wind turbine falls outside a predetermined range; The deterioration detection device according to claim 3 or 4.

6. the detection unit further detects deterioration of the power transmission cable based on information indicating vibration of the power transmission cable, the information being included in the optical signal. The deterioration detection device according to claim 3 .

7. the optical fiber is laid along the plurality of wind turbines, the detection unit detects deterioration of each of the plurality of wind turbines based on information indicating vibration of each of the plurality of wind turbines, the information being included in the optical signal; The deterioration detection device according to any one of claims 3 to 6.

8. The wind turbine may further include a notification unit that notifies a predetermined notification destination that the wind turbine has deteriorated when the detection unit determines that the wind turbine has deteriorated. The deterioration detection device according to any one of claims 3 to 7.

9. A deterioration detection method using a deterioration detection device, a communication step of transmitting pulsed light to an optical fiber laid along the power-generating wind turbine and receiving an optical signal containing information indicating the vibration of the wind turbine from the optical fiber; a detection step of detecting deterioration of the wind turbine based on information indicating vibration of the wind turbine contained in the optical signal; Including, In a portion other than the wind turbine, the optical fiber is laid along a power transmission cable connected to the wind turbine. Deterioration detection method.

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