JP7421828B1 - Wind power generator monitoring system, wind power generation equipment, and wind power generator monitoring method - Google Patents

Abstract

An object of the present invention is to provide a wind power generator monitoring system, a wind power generation facility, and a wind power generator monitoring method that easily and reliably detect that a wind power generator has been struck by lightning. A monitoring system 2 for a wind power generator 1 that includes an infrared camera 20 that monitors the wind power generator 1 and an analysis device 21 that has a processing unit 210 that estimates temperature based on an image taken by the infrared camera 20. The processing unit 210 uses the estimated temperature of the estimated lightning strike position where the wind power generator 1 is estimated to have been struck by lightning, which is estimated based on the image, and the criteria for determining that the wind power generator 1 has been struck by lightning. It is determined whether the wind power generator 1 has been struck by lightning by comparing the temperature with the temperature. [Selection diagram] Figure 1

Description

Article 30, Paragraph 2 of the Patent Act applies WIND JOURNAL vol. 03 2022 AUTUMN, pages 28-29, August 31, 2022

The present invention relates to a wind power generator monitoring system, wind power generation equipment, and a wind power generator monitoring method. More specifically, the present invention relates to a wind power generator monitoring system, a wind power generation facility, and a wind power generator monitoring method for detecting that a wind power generator is struck by lightning.

Wind power generation is a power generation system in which the kinetic energy of the wind is converted into rotational energy of a windmill, and the rotational energy is converted into electrical energy by a generator. Since the kinetic energy of the wind is proportional to the area that receives the wind and is also proportional to the cube of the wind speed, it is important for wind power generators to receive the wind efficiently in the windy upper atmosphere using large wind turbines.

On the other hand, as wind power generators become larger and more sophisticated, the risk of wind power generators being struck by lightning increases. In cases where a wind power generator is struck by lightning and stops operating, the damage may have spread due to repeated lightning strikes before the damage caused by the lightning strike becomes apparent. For this reason, for example, Patent Document 1 uses two cameras that detect visible light to near-infrared light, one camera photographs lightning to determine the trajectory of the lightning, and the other camera A lightning detection system has been disclosed that detects that a wind turbine has been struck by lightning by photographing the wind turbine and estimating the position of the wind turbine (particularly the rotating blades) at the time of the lightning strike.

Japanese Patent Application Publication No. 2022-178068

However, the lightning detection system of Patent Document 1 uses two cameras, and depending on the environmental conditions of the wind turbine (wind direction, wind strength, etc.), it may be difficult to estimate the position of the blades. There are cases.

In view of the above circumstances, an object of the present invention is to provide a wind power generator monitoring system, wind power generation equipment, and a wind power generator monitoring method that easily and reliably detect that a wind power generator has been struck by lightning. do.

A wind power generator monitoring system according to a first aspect of the invention includes an infrared camera that monitors a wind power generator, and an analysis device that has a processing unit that estimates temperature based on an image taken by the infrared camera. The system includes a processing unit that calculates a temperature at an estimated location of a lightning strike where a lightning strike is estimated to have occurred in a wind power generator, which is estimated based on an image, and a reference temperature for determining that a lightning strike has occurred in a wind power generator. The feature is that a lightning strike on a wind power generator is determined by comparison.

According to this configuration, it is possible to detect that a wind power generator has been struck by lightning with just one camera, so it can be said to be simple. In addition, when a wind power generator is struck by lightning, the temperature at the lightning strike point of the wind power generator will change due to the lightning strike, so the processing unit will calculate the estimated temperature of the lightning strike position based on the image taken by the infrared camera and the wind power generator. By comparing the temperature with a reference temperature for determining whether a wind turbine has been struck by lightning, it is possible to reliably detect that a wind turbine has been struck by lightning.

Further, in the wind power generator monitoring system of the first invention, the processing unit sets the reference temperature to a temperature higher than a predetermined temperature with respect to the ambient temperature of the estimated lightning strike position, and when the estimated temperature is higher than the reference temperature. It can be determined that a wind power generator has been struck by lightning. According to this configuration, the lightning strike point of the wind power generator is heated by the lightning strike and its temperature rises, so the processing section sets the temperature to a predetermined temperature or higher based on the estimated temperature and the surrounding temperature of the estimated lightning strike position. By comparing the temperature with the reference temperature, it is possible to reliably detect that a wind power generator has been struck by lightning.

Further, in the wind power generator monitoring system of the first invention, the processing unit has a function of reporting lightning strike information to notify that a lightning strike has occurred when a wind power generator is struck by lightning. Can be done. According to this configuration, it is possible to reliably notify the operator that the wind power generator has been struck by lightning.

The wind power generator monitoring system of the first invention can set the reference temperature to a temperature that is 30 degrees or more higher than the surrounding temperature of the estimated lightning strike position. According to this configuration, the lightning strike point is heated by the lightning strike and becomes 30 degrees or more higher than the surrounding temperature of the estimated lightning strike position, so that it is possible to reliably detect that the wind power generator has been struck by lightning.

Further, in the wind power generator monitoring system of the first invention, the analysis device includes a storage unit that stores image information regarding images taken by an infrared camera, and an image generation function that generates a temperature distribution image based on the image information. , and a display section that displays the image generated by the image generation function. According to this configuration, the operator can visually check the state of lightning strikes on the wind power generator based on the temperature distribution image, so it is possible to reliably detect that a wind power generator has been struck by lightning. can. Furthermore, damage at the lightning strike point of the wind power generator can be inspected based on the temperature distribution of the wind power generator.

Furthermore, the wind power generator monitoring system of the first invention has a function in which the processing unit issues lightning strike information to notify that the wind power generator has been struck by lightning when the estimated temperature becomes equal to or higher than the reference temperature. , and a function of transmitting lightning strike information to the display section, and the display section may have a function of displaying an alert as an image based on the lightning strike information. According to this configuration, the operator can reliably detect that the wind power generator has been struck by lightning.

A wind power generation facility according to a second invention is characterized in that it includes a wind power generator and the wind power generator monitoring system according to the first invention.

A method for monitoring a wind power generator according to a third aspect of the invention includes the steps of estimating the temperature of the wind power generator based on an image taken by an infrared camera that monitors the wind power generator, and the step of estimating the temperature of the wind power generator based on the image taken by an infrared camera that monitors the wind power generator. The present invention is characterized by comprising the step of determining whether a wind power generator has been struck by lightning by comparing the temperature with a reference temperature for determining that a lightning strike has occurred.

Further, the method for monitoring a wind power generator according to the third aspect of the invention may further include the step of notifying that the wind power generator has been struck by lightning when the estimated temperature becomes equal to or higher than a reference temperature.

According to the present invention, it is possible to easily and reliably detect that a wind power generator has been struck by lightning.

It is a schematic diagram of the wind power generation facility of this embodiment. FIG. 1 is a schematic diagram of a wind power generator 1 according to the present embodiment. 1 is a schematic diagram of a monitoring system 2 for a wind power generator 1 according to the present embodiment. It is a lightning image obtained by the analysis device 21 of this embodiment. It is a flowchart of the monitoring method of the wind power generator 1 of this embodiment.

First, the wind power generation equipment of this embodiment will be explained with reference to the drawings. The wind power generation equipment of this embodiment includes a wind power generator 1 and a monitoring system 2 for the wind power generator 1, as shown in FIG.

<Wind generator>
As shown in FIG. 2, the wind power generator 1 includes a wind turbine 100 that receives wind, and a generator 11 that converts the rotational energy of the wind turbine 100 into electrical energy.

<Windmill>
As shown in FIG. 2, the wind turbine 100 includes a rotor, a nacelle 101, and a tower 102. The rotor includes three blades 1000 that receive wind, a hub 1001 that connects the bases of the three blades 1000, a rotor shaft (not shown) that is connected to the hub 1001 and rotates together with the blades 1000, and a rotor that rotates. It is composed of a speed increaser (not shown) that increases the rotation speed to the required rotation speed of the generator 11, and a main shaft (not shown) that transmits the increased rotation speed to the generator 11. The nacelle 101 houses a speed increaser, a main shaft, and a generator 11 therein. The tower 102 supports the rotor and the nacelle 101 by assembling the rotor and the nacelle 101 on the top thereof. Inside the tower 102, power cables, maintenance elevators, ladders, and the like are installed.

Note that although FIG. 2 illustrates a case where an upwind propeller type windmill with a horizontal rotation axis is employed as the windmill 100, the windmill employed in the wind power generation equipment of this embodiment is not particularly limited. Windmills include horizontal-axis windmills, vertical-axis windmills, and the like, depending on the direction of the rotation axis, and any of these windmills can be employed as the windmill for the wind power generation facility of this embodiment. In addition, in terms of operating principles, wind turbines include lift type wind turbines that rotate at high speed using the lifting force of the blades, and drag type wind turbines that rotate at low speed due to the pushing force of the wind, but these are adopted in the wind power generation equipment of this embodiment. The operating principle of the wind turbine is not particularly limited. Note that if the wind turbine is to be made larger, a propeller type horizontal axis wind turbine that is a lift type is preferable.

Further, when a propeller-type windmill which is a horizontal axis windmill and is a lift type is used, the windmill may be of either an upwind type or a downwind type. In the upwind system, the rotating surface of the rotor is located on the windward side, and in the downwind method, the rotating surface of the rotor is located on the leeward side. From the perspective of increasing the size of the wind turbine, an upwind system is preferable because it is less susceptible to wind disturbances caused by the tower. In the upwind system, stable output can be obtained by equipping the nacelle 101 with a yaw drive device for directing the rotating surface of the rotor upwind and a pitch drive device for controlling the output.

The material of the blades 1000 constituting the rotor is not particularly limited, and examples thereof include steel, glass fiber reinforced plastic, and carbon fiber reinforced plastic. The material of the nacelle 101 is not particularly limited, but examples thereof include steel, aluminum, and copper. The material of the tower 102 is not particularly limited, but examples include steel and concrete.

Although the above example shows a case where the windmill 100 has three blades 1000, the number of blades 1000 is not limited. In the case of a propeller-type wind turbine 100, the number of blades 1000 is preferably three from the viewpoint of rotor stability.

<Generator>
As the generator 11, various generators having a mechanism capable of converting rotation of a rotor into electric power can be employed. Examples include induction generators, synchronous generators, and direct drive generators connected directly to the rotor without a speed increaser.

<Wind generator monitoring system>
As shown in FIG. 3, the monitoring system 2 for the wind power generator 1 is capable of monitoring the wind power generator 1 and photographing surrounding images including the wind power generator 1 and its surroundings (the sky, surrounding buildings, mountains, etc.). The present invention includes an infrared camera 20 that can be used as an infrared camera, and an analysis device 21 that analyzes images taken by the infrared camera 20.

<Infrared camera>
The infrared camera 20 has a function of photographing a lightning strike as an image, and has a function of supplying information regarding the photographed image (hereinafter referred to as image information) to the analysis device 21.

This infrared camera 20 includes an infrared lens 200, an infrared detector 201, an amplifier (not shown), and an A/D converter (not shown). Infrared rays consist of near infrared rays with a wavelength of 0.78 to 2.5 μm, middle infrared rays with a wavelength of 2.5 to 8 μm, and far infrared rays with a wavelength of 8 to 100 μm. In the wind power generation equipment of this embodiment, it is necessary to detect as an image that lightning has struck the wind power generator 1, so the infrared camera 20 preferably has a far-infrared sensitivity range.

The infrared lens 200 forms an image of the received infrared light, and is selected according to the sensitivity wavelength range of the infrared camera 20. Examples of materials for the infrared lens 200 include silica glass for near-infrared rays, and germanium, silicon, and chalcogenide for mid- and far-infrared rays.

The infrared detector 201 converts received infrared light into an analog electrical signal. The infrared detector 201 is selected according to the sensitivity wavelength range of the infrared camera 20, and includes a quantum type element and a thermal type element. Examples of quantum elements include those whose light-receiving surface material is InGaAs with a sensitivity wavelength range of 0.6 to 1.7 μm, and those whose light-receiving surface material is InSb with a sensitivity wavelength range of 1.5 to 5.1 μm. can be mentioned. Examples of the thermal element include a thermopile array element with a sensitivity wavelength range of 1 to 18 μm and a microbolometer element with a sensitivity wavelength range of 3 to 18 μm.

The amplifier amplifies analog electrical signals converted from infrared rays. The A/D converter converts an amplified analog electrical signal into a digital electrical signal.

The image information described above includes a digital electrical signal amplified by an amplifier. Of course, in addition to the digital electrical signal, the image information may include an analog electrical signal converted by the infrared detector 201. Furthermore, even when the device does not have an amplifier or has an amplifier, an analog electric signal converted by the infrared detector 201 may be included in the image information instead of a digital electric signal. Further, in the case where the infrared camera 20 has a temperature information acquisition function etc. that estimates (or calculates) the temperature of the object photographed in the image (that is, the photographed position) based on the photographed image, In this case, the image information may include information regarding the estimated (or calculated) temperature.

<Analysis device>
The analysis device 21 includes a processing section 210, a storage section 211, and a display section 212. The analysis device 21 is installed, for example, in a monitoring facility remote from the wind power generator 1, and can remotely monitor the wind power generator 1.

The processing unit 210 has a function of determining whether or not the wind power generator 1 has been struck by lightning, and notifying information about the lightning strike when the wind power generator 1 has been struck by lightning.

The processing unit 210 has a lightning strike determination function that determines whether the wind power generator 1 has been struck by lightning based on image information. Specifically, the processing unit 210 estimates the position where a lightning strike is estimated to have occurred in the wind power generator 1 (hereinafter sometimes referred to as the estimated lightning strike position) based on the image information, and calculates the estimated lightning strike position. It has a lightning strike determination function that compares the estimated temperature, which is the temperature at the location, with a reference temperature and determines that a lightning strike has occurred if the estimated temperature is higher than the reference temperature.

This lightning strike determination function has a lightning strike position estimation function that estimates an estimated lightning strike position and a reference temperature determination function that determines a reference temperature, which are prerequisites for the lightning strike determination function.

The lightning strike position estimation function can estimate the estimated lightning strike position by superimposing an image of the wind power generator 1 obtained from the image information and a lightning strike image obtained from the image information. That is, the lightning strike position estimation function can estimate the estimated lightning strike position by overlapping the lightning strike trajectory and the image of the wind power generator 1 and from the position where the two overlap. For example, it is possible to obtain an image as shown in Fig. 5 as a lightning image, so by overlapping this lightning image with the image of the wind power generator 1 at the timing when this lightning image was obtained, the estimated lightning strike position can be determined. It can be estimated.

Note that the image of the wind power generator 1 used by the lightning strike position estimation function may be the image of the infrared camera 20 alone, or may be used in addition to or in place of the image of the infrared camera 20. An image taken by a camera (visible light camera) that photographs the same position as 20 may also be used.

The reference temperature determination function has a function of determining a reference temperature that is a reference for determining the presence or absence of a lightning strike, based on the temperature around the estimated lightning strike position. Specifically, when the estimated lightning position is determined by the lightning position estimation function, the reference temperature determination function calculates the temperature around the estimated lightning position (in other words, the temperature of the wind turbines around the estimated lightning position) based on the image information. 1 temperature). It also has a function of determining an average temperature from the estimated ambient temperature and setting a temperature higher than this average temperature (for example, a temperature 30 degrees or more higher than the average temperature) as a reference temperature.

Note that as the ambient temperature that serves as a reference for determining the reference temperature, the average temperature of the wind power generator 1 around the estimated lightning strike position can be adopted as described above, but it is not necessarily limited to such an average temperature. I can't. For example, it may be the average value of the temperatures of several points that are a predetermined distance from the estimated lightning strike position, or the temperature of any one of the temperatures of one or several points that are a predetermined distance from the estimated lightning strike location (e.g. , the highest temperature, the lowest temperature, the median temperature, etc.) may be used as the reference temperature for determining the reference temperature.

Further, the surrounding range used when calculating the average temperature around the estimated lightning strike position, that is, the area around which the average temperature is calculated, and the distance from the estimated lightning strike position are not particularly limited. For example, the temperature within a radius of 500 mm or more to 5000 mm or less centered on the estimated lightning strike position can be set as the area for calculating the surrounding average temperature.

When the reference temperature determination function determines the reference temperature, the lightning strike determination function compares this reference temperature with the estimated temperature of the estimated lightning strike position, and when the estimated temperature is equal to or higher than the reference temperature, the lightning strike determination function determines the reference temperature. It is determined that wind power generator 1 has been struck by lightning.

The reason why the lightning strike determination function can determine a lightning strike using the above method is as follows.
First, lightning rapidly increases the temperature of the surrounding area (air, steam, rain droplets, etc.) along the path that the lightning passes, so if an image of the wind power generator 1 and its surroundings is taken using the infrared camera 20, , it is possible to understand the trajectory of lightning. Then, by superimposing the image of the lightning trajectory and the image of the wind power generator 1 at the timing when the lightning trajectory was photographed (or the image of the wind generator 1 in a state where there was no lightning strike), the wind power It is possible to estimate the location where the generator 1 may have been struck by lightning. On the other hand, if the wind power generator 1 is struck by lightning, the parts of the wind power generator 1 where the lightning struck (for example, the rotor blades 1000, the nacelle 101, etc.) will be heated by the lightning, so the lightning strike will affect other parts of the wind power generator 1. The temperature will rise significantly. Therefore, by using the image information and the temperature information obtained from the image information, it is possible to determine whether the wind power generator 1 has been struck by lightning, and if the wind power generator 1 has been struck by lightning, the estimated location of the lightning strike. becomes possible to estimate. That is, when the estimated temperature at the estimated lightning strike position becomes equal to or higher than the reference temperature, it can be determined that a lightning strike has occurred at the estimated lightning strike position in the wind power generator 1.

In addition, when the estimated temperature at the estimated lightning strike position is equal to or higher than the reference temperature and the lightning strike determination function determines that the wind power generator 1 has been struck by lightning, the processing unit 210 informs the operator or manager that a lightning strike has occurred. , and has a lightning alert function that notifies other external parties. The method by which the lightning alert function notifies the occurrence of a lightning strike is not particularly limited. For example, when the lightning detection function determines that there has been a lightning strike, it may sound an alarm to notify workers and managers of the occurrence of lightning, and it may also notify contractors and managers of lightning strikes by email, SNS, etc. method etc. can be adopted.

The analysis device 21 includes a storage section 211 in addition to the processing section 210 described above. This storage unit 211 has a function of storing image information supplied from the infrared camera 20. The storage unit 211 also stores information such as a reference temperature that serves as a reference for the occurrence of a lightning strike on the wind power generator 1, the ambient temperature used when calculating the reference temperature, the estimated location and temperature of the estimated lightning strike, and the information about the occurrence of a lightning strike. Information such as the time of occurrence can be stored.

The display unit 212 has an image generation function that generates an image based on image information supplied from the infrared camera 20. Further, the display unit 212 can receive a warning (lightning information) from the lightning warning function of the processing unit 210 and display an alarm as an image. Thereby, for example, an operator of a monitoring facility can visually detect that the wind power generator 1 has been struck by lightning. In this case, if the alarm is displayed as an image along with the temperature distribution image, it will be easier for administrators to understand the lightning strike situation, and if the temperature distribution images before and after the time of the lightning strike are displayed together with the alarm, the administrator, etc. Lightning strikes are easier to recognize.

Further, if the storage unit 211 and the display unit 212 are provided, after detecting that the wind power generator 1 has been struck by lightning, for example, an operator of a monitoring facility can notify the operator that the wind power generator 1 has been struck by lightning. It becomes easier to understand. In other words, based on the image information stored in the storage unit 211, the lightning strike on the wind power generator 1 can be visually confirmed on the display unit 212, so that it is possible to visually confirm that the wind power generator 1 has been struck by lightning. Workers, etc. can reliably detect it. Furthermore, it is possible to estimate whether or not damage has occurred at the lightning strike point of the wind power generator 1 from the state of the temperature distribution of the wind power generator 1. Then, if it is determined that the damage caused by the lightning strike is large, the lightning strike location can be quickly inspected and the damage can be repaired quickly.

<How to monitor wind power generators>
Next, a method for monitoring the wind power generator 1 according to the present embodiment will be described with reference to the drawings.

FIG. 5 is a flowchart showing a method for monitoring the wind power generator 1 of this embodiment. As shown in FIG. 5, first, the wind power generator 1 is monitored with the infrared camera 20 (step S1). Note that if another camera is used, monitoring with the other camera is also performed at the same time.

Then, the processing unit 210 estimates the temperature of the wind power generator 1 based on the image taken by the infrared camera 20 (step S2).

Next, it is determined whether the trajectory of lightning (that is, the presence of a tail of a high-temperature region that can be determined to be lightning) can be seen on the display unit 212 (step S3). If the trajectory of the lightning cannot be determined (NO in step S3), the process returns to monitoring the wind power generator 1 using the infrared camera 20 (step S1). If the trajectory of the lightning can be grasped (YES in step S3), the estimated lightning strike position is estimated (step S4).

Next, a reference temperature is set based on the temperature around the estimated lightning strike position. For example, a temperature that is 30 degrees or more higher than the average temperature around the estimated lightning strike position is set as the reference temperature (step S5).

Then, the processing unit 210 compares the estimated temperature at the estimated lightning strike position with a reference temperature (step S6). If the estimated temperature is lower than the reference temperature (NO in step S6), the process returns to monitoring the wind power generator 1 using the infrared camera 20 (step S1). If the estimated temperature is equal to or higher than the reference temperature (YES in step S6), it is determined that the wind power generator 1 has been struck by lightning (step S7). Finally, an alarm is displayed on the display unit 212 to notify that the wind power generator 1 has been struck by lightning (step S8). When the notification ends, the wind power generator 1 is monitored again using the infrared camera 20 (step S1).

Although the wind power generation equipment and the method for monitoring the wind power generator 1 according to the present embodiment have been described above, specific aspects of the present invention are not limited to the above embodiments. For example, in the monitoring system 2 for the wind power generator 1, the imaging area of the infrared camera 20 (that is, the attitude and position of the infrared camera 20) may be fixed, or the direction of the infrared camera 20 may be changed. Good too. For example, a pan head for adjusting the attitude of the infrared camera 20 can be provided. If such a pan head is provided, it becomes possible to change the direction in which the infrared camera 20 photographs, for example, horizontally, vertically, diagonally upward, or diagonally downward. According to this, based on the signal from the processing unit 210, the wind power generator 1 can be monitored by adjusting the direction of the infrared camera 20 to match the changing blade 1000. In addition, when monitoring with another camera is also performed at the same time, the other camera is also installed on the pan head so that the other camera photographs the same position as the infrared camera 20.

In addition, in the wind power generation equipment of this embodiment, one wind power generator 1 is provided with a monitoring system 2 for one wind power generator 1, but for example, if a plurality of wind power generators 1 and a wind power generation It can be configured with a plurality of infrared cameras 20 (and/or a plurality of other cameras) each monitoring the machine 1, and in this case, it is not necessary to have a plurality of analysis devices 21, and the analysis devices 21 can be integrated into one. be able to.

The wind power generator monitoring system, wind power generation equipment, and wind power generator monitoring method of the present invention are suitable for offshore wind farms where access and maintenance work is difficult.

1 Wind power generator 2 Wind power generator monitoring system 20 Infrared camera 21 Analysis device 210 Processing section 211 Storage section 212 Display section

Claims (9)

A wind power generator monitoring system comprising: an infrared camera that takes images of the surrounding area including the wind power generator; and an analysis device that has a processing unit that estimates temperature based on the surrounding image taken by the infrared camera,
The processing unit includes:
The temperature is estimated by comparing the estimated temperature of the estimated lightning strike position where the wind power generator is estimated to have been struck by lightning, which is estimated based on surrounding images , with a reference temperature for determining that the wind power generator has been struck by lightning . A monitoring system for a wind power generator, characterized in that it is determined that the wind power generator has been struck by lightning when the temperature is higher than a reference temperature . The processing unit includes:
The reference temperature is set to a temperature higher than a predetermined temperature with respect to the ambient temperature of the estimated lightning strike position,
The wind power generator monitoring system according to claim 1, wherein it is determined that the wind power generator has been struck by lightning when the estimated temperature becomes equal to or higher than the reference temperature. The processing unit includes:
3. The wind power generator monitoring system according to claim 2, further comprising a function of issuing lightning strike information to notify that a lightning strike has occurred when the wind power generator is struck by lightning. The reference temperature is
The temperature is 30 degrees or more higher than the surrounding temperature of the estimated lightning strike position,
The wind power generator monitoring system according to claim 2, characterized in that: The analysis device includes:
a storage unit that stores image information regarding peripheral images taken by the infrared camera;
an image generation function that generates a temperature distribution image based on the image information;
The wind power generator monitoring system according to claim 1, further comprising a display unit that displays an image generated by the image generation function. The processing unit includes:
a function of issuing lightning strike information to notify that a lightning strike has occurred in the wind power generator when the estimated temperature is equal to or higher than the reference temperature;
and a function of transmitting the lightning information to the display section,
The display section is
The wind power generator monitoring system according to claim 5, further comprising a function of displaying an alert image based on the lightning strike information. A wind power generation facility comprising a wind power generator and the wind power generator monitoring system according to any one of claims 1 to 6. estimating the temperature of the wind power generator based on a surrounding image including the wind power generator taken by an infrared camera ;
a step of comparing the estimated temperature with a reference temperature for determining that the wind power generator has been struck by lightning, and determining whether the wind power generator has been struck by lightning. Monitoring method. The method for monitoring a wind power generator according to claim 8, further comprising the step of notifying that the wind power generator has been struck by lightning when the estimated temperature becomes equal to or higher than the reference temperature.

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