Anomaly detection system and method for wind power generation equipment

Abstract

To provide an abnormality diagnosis system for a wind power generation facility, which can suppress a decrease in the availability rate of the wind power generation facility.SOLUTION: An abnormality diagnosis system for a wind power generation facility is for performing abnormality diagnosis on the wind power generation facility. When defining an angle, which a wind direction makes with respect to the rotation axis of a wind turbine rotor in the wind power generation facility, as a wind direction deviation, the wind power generation facility is configured to rotate a nacelle so as to reduce the absolute value of the wind direction deviation, and the abnormality diagnosis system is configured to perform abnormality diagnosis on an anemometer of the wind power generation facility on the basis of at least one of the integrated value of an amount of rotation and the number of rotations of the nacelle over a specified period.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an abnormality diagnosis system and an abnormality diagnosis method for a wind power generation facility.

Background Art

[0002] Patent Document 1 describes that the shaft of a wind direction meter in a wind power generation facility is forcibly driven by a motor to detect the torque required for driving the shaft, and based on the detected value of the torque, it is determined whether icing has occurred on the wind direction meter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the wind power generation facility described in Patent Document 1, a dedicated motor is required to detect an abnormality in the wind direction meter, which complicates the configuration of the wind power generation facility and leads to increased costs.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide an abnormality diagnosis system and an abnormality diagnosis method for a wind power generation device that can diagnose an abnormality in a wind direction meter of a wind power generation facility with a simple configuration.

Means for Solving the Problems

[0006] To achieve the above object, an abnormality diagnosis system for a wind power generation facility according to at least one embodiment of the present disclosure is an abnormality diagnosis system for a wind power generation facility for performing an abnormality diagnosis of a wind power generation facility, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period.

[0007] To achieve the above objective, the method for diagnosing abnormalities in wind power generation equipment according to at least one embodiment of this disclosure is: If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind power generation facility based on at least one of the cumulative value of the amount of rotation of the nacelle and the number of rotations during a predetermined period. [Effects of the Invention]

[0008] According to at least one embodiment of this disclosure, an abnormality diagnosis system and method for a wind turbine are provided that can diagnose abnormalities in the wind vane of a wind turbine with a simple configuration. [Brief explanation of the drawing]

[0009] [Figure 1] This diagram illustrates an example of the configuration of a wind power generation facility that is subject to abnormality diagnosis by the abnormality diagnosis system disclosed herein. [Figure 2] This figure shows an example of the hardware configuration of an abnormality diagnosis system 40 for performing abnormality diagnosis on the wind power generation equipment 1 shown in Figure 1. [Figure 3] Figure 2 is a block diagram illustrating the functional configuration of the anomaly diagnosis system 40. [Figure 4] Figures 2 and 3 show a portion of the abnormality diagnosis flow performed by the abnormality diagnosis system 40. [Figure 5]This figure shows a continuation of the abnormality diagnosis flow shown in Figure 4. [Figure 6] This figure shows a continuation of the abnormality diagnosis flow shown in Figure 5. [Figure 7] This diagram illustrates the abnormality in wind direction tracking control caused by the sticking of the rotating part of the wind vane. [Figure 8] This figure shows an example of the relationship between average wind speed and the turbulence threshold, Itth. [Figure 9] This is a diagram to explain the wind direction deviation Δα. [Figure 10] This figure shows an example of the relationship between wind speed and target output for both the normal operation mode and the load suppression mode. [Figure 11] This figure shows an example of the relationship between the output of the generator 11 and the target blade pitch angle for both the normal operation mode and the load suppression mode. [Modes for carrying out the invention]

[0010] Hereinafter, several embodiments of this disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of the invention, but are merely illustrative examples. For example, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" should not only strictly describe such arrangements, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical," "equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. For example, expressions describing shapes such as squares or cylinders shall not only represent geometrically precise shapes such as squares or cylinders, but also shapes that include protrusions, chamfers, etc., to the extent that the same effect can be achieved. On the one hand, the expressions "comprising", "having", "including", or "possessing" a component do not exclude the presence of other components.

[0011] FIG. 1 is a diagram for explaining an example of the configuration of a wind power generation facility 1 which is the object of abnormality diagnosis by an abnormality diagnosis system 40 of the present disclosure. As shown in FIG. 1, the wind power generation facility 1 includes a support column 2 erected on a foundation or the like, a nacelle 3 installed at the upper end of the support column 2, and a windmill rotor 4 rotatably provided on one end side of the nacelle 3. The windmill rotor 4 includes a rotor head 5 and a plurality of windmill blades 6 radially attached to the rotor head 5. Further, the wind power generation facility 1 includes a blade pitch mechanism 12 for adjusting the pitch angle of each of the windmill blades 6 (hereinafter referred to as "blade pitch angle"), and a yaw turning mechanism 14 for adjusting the yaw angle of the nacelle 3.

[0012] Inside the nacelle 3, a generator 11 connected to the windmill rotor 4 via a speed increaser 10 is installed. By transmitting the rotation of the windmill rotor 4 to the generator 11 via the speed increaser 10 to drive the generator 11, electric power is output from the generator 11.

[0013] The wind power generation facility 1 includes a wind speed meter 7 that measures the wind speed V of the wind passing through the wind power generation facility 1, a wind direction meter 8 that measures a wind direction deviation Δα, which is the angle formed by the wind direction with respect to the rotation axis of the wind turbine rotor 4, a thermometer 9 that measures the air temperature T, a blade pitch angle sensor 15 that measures the blade pitch angle θ, and a yaw angle sensor 18 that measures the yaw angle αz of the nacelle 3. The wind speed meter 7, the wind direction meter 8, and the thermometer 9 are provided on the outer surface of the nacelle 3 (for example, the upper part of the nacelle 3, etc.). The wind speed meter 7 may be, for example, a cup-type or windmill-type wind speed meter. The cup-type wind speed meter measures the wind speed by measuring the rotation speed of wind cups (cups) rotating around the rotation axis with a rotary encoder or the like, and the windmill-type wind speed meter measures the wind speed V by measuring the rotation speed of propeller-shaped blades rotating around the rotation axis with a rotary encoder or the like. The wind direction meter 8 may be, for example, a potentiometer-type wind direction meter that converts the change in the direction of the vane rotating around the rotation axis into a change in electrical resistance. The yaw angle sensor 18 measures, for example, the angle formed by the rotation axis of the wind turbine rotor 4 with respect to the predetermined reference azimuth as the yaw angle αz of the nacelle 3. In the exemplary form shown in FIG. 1, since the wind direction meter 8 is fixed to the nacelle 3, as shown in FIG. 9, the wind direction deviation Δα (=αw - αz), which is the difference between the wind direction αw and the yaw angle αz of the nacelle 3, is measured. When the wind direction meter 8 is provided separately from the wind turbine (for example, fixed to the ground or the like) like a met mast, the wind direction deviation Δα may be obtained by finding the difference between the wind direction measured by the wind direction meter 8 and the yaw angle of the nacelle 3 measured by the yaw angle sensor 18.

[0014] At an appropriate location of the wind power generation facility 1 (for example, inside the nacelle 3 or inside the support column 2, etc.), a control device 20 for performing various operation controls of the wind power generation facility 1 is provided. Signals indicating each of the wind speed V measured by the wind speed meter 7, the wind direction deviation Δα measured by the wind direction meter 8, the air temperature T measured by the thermometer 9, the blade pitch angle θ measured by the blade pitch angle sensor 15, and the yaw angle αz of the nacelle 3 measured by the yaw angle sensor 18 are input to the control device 20.

[0015] The control device 20 controls the blade pitch mechanism 12 to adjust the blade pitch angle to the optimal blade pitch angle based on various conditions such as the wind speed V measured by the anemometer 7. When the wind speed V measured by the anemometer 7 exceeds a predetermined cutout wind speed, the control device 20 performs cutout control, which controls the blade pitch angle to the feather position and automatically stops the rotation of the wind turbine rotor 4.

[0016] Furthermore, the control device 20 is configured to perform wind direction following control, which is a control that follows the wind direction so that the orientation of the wind turbine rotor 4 is directly aligned with the wind direction. Specifically, wind direction following control is a control that adjusts the yaw angle of the nacelle 3 by controlling the yaw rotation mechanism 14 to reduce (preferably to 0) the absolute value of the wind direction deviation Δα measured by the wind vane 8 when the absolute value of the wind direction deviation Δα exceeds a threshold Δαth.

[0017] The control device 20 is configured to communicate with the anomaly diagnosis system 40 via the communication network 21. The control device 20 transmits various measurement data measured by the wind power generation equipment 1 to the anomaly diagnosis system 40, such as wind speed V measured by the anemometer 7, wind direction deviation Δα measured by the wind vane meter 8, temperature T measured by the thermometer 9, blade pitch angle θ measured by the blade pitch angle sensor 15, and yaw angle αz measured by the yaw angle sensor 18. The anomaly diagnosis system 40 stores the various measurement data transmitted from the control device 20 as time-series data and uses it for anomaly diagnosis of the wind power generation equipment 1 as described later.

[0018] Figure 2 shows an example of the hardware configuration of the anomaly diagnosis system 40 shown in Figure 1. Figure 3 is a block diagram illustrating the functional configuration of the anomaly diagnosis system 40 shown in Figure 2.

[0019] As shown in Figure 2, the anomaly diagnosis system 40 is configured using a computer that includes, for example, a processor 72, RAM (Random Access Memory) 74, ROM (Read Only Memory) 76, HDD (Hard Disk Drive) 78, input I / F 80, output I / F 82, and display 83, all of which are connected to each other via a bus 84. The hardware configuration of the anomaly diagnosis system 40 is not limited to the above and may be configured with a combination of control circuits and storage devices. Furthermore, the anomaly diagnosis system 40 is configured by a computer executing programs that realize each function of the anomaly diagnosis system 40. The functions of each part of the anomaly diagnosis system 40 described below are realized, for example, by loading a program held in ROM 76 into RAM 74 and executing it with the processor 72, as well as by reading and writing data to RAM 74 and ROM 76. The hardware constituting the anomaly diagnosis system 40 may be centralized in one location or distributed across multiple locations. The following describes an example in which the abnormality diagnosis system 40 is located away from the wind power generation equipment 1 and abnormality diagnoses of the wind power generation equipment 1 are performed remotely. However, each function of the abnormality diagnosis system 40 may be implemented, for example, by the control device 20 provided by the wind power generation equipment 1.

[0020] As shown in Figure 3, the anomaly diagnosis system 40 includes a measurement data acquisition unit 42, a turning data calculation unit 44, an anomaly diagnosis unit 46, and a storage unit 50. The functions of each part of the anomaly diagnosis system 40 will be explained below using Figures 4 to 6, etc.

[0021] Figure 4 shows a portion of the abnormality diagnosis flow by the abnormality diagnosis system 40 shown in Figures 2 and 3. Figure 5 shows a portion of the continuation of the abnormality diagnosis flow shown in Figure 4. Figure 6 shows a portion of the continuation of the abnormality diagnosis flow shown in Figure 5.

[0022] As shown in Figure 4, in S101, the measurement data acquisition unit 42 acquires time-series data such as wind speed V measured by the anemometer 7, wind direction deviation Δα measured by the wind vane meter 8, temperature T measured by the thermometer 9, wing pitch angle θ measured by the wing pitch angle sensor 15, and yaw angle αz measured by the yaw angle sensor 18 from the control device 20 via the communication network 21.

[0023] In S102, the rotation data calculation unit 44 calculates the cumulative value ΣA of the rotation amount A of the nacelle's yaw rotation at predetermined intervals (for example, every hour) based on the time-series data of the yaw angle αz acquired in S101, and counts the number of times N the cumulative value ΣA exceeds the threshold Ath. Here, the cumulative value ΣA of the rotation amount A of the nacelle's yaw rotation calculated at predetermined intervals is, for example, the total rotation amount (deg) of the nacelle's yaw rotation in one hour if the predetermined interval is one hour, and means the value obtained by accumulating the magnitude (absolute value) of the angle at which the nacelle was rotated in each rotation operation of the nacelle over one hour. Furthermore, the number of times N the cumulative value ΣA exceeds the threshold Ath is the number of periods corresponding to the cumulative value ΣA that exceeded the threshold Ath when the cumulative value ΣA of the rotation amount A of the nacelle's yaw rotation is calculated at predetermined intervals.

[0024] In S103, if the number of times N the cumulative value ΣA exceeds the threshold Ath during a predetermined period (for example, a fixed period such as 6 hours) is less than a predetermined number Nth, that is, if the frequency N in which the cumulative value ΣA exceeds the threshold Ath is less than the threshold Nth, then in S104, the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state X as described below. State X means that the wind power generation equipment 1 is in a normal state and the wind vane 8 is normal. When the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state X, it operates the wind power generation equipment 1 in normal operation mode. That is, when the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state X, it transmits a normal operation mode instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to operate the wind power generation equipment 1 in normal operation mode. When the control device 20 receives the normal operation mode instruction signal, it operates the wind power generation equipment 1 in normal operation mode.

[0025] In S103, if the number of times N the cumulative value ΣA over a predetermined period (e.g., a fixed time such as 6 hours) exceeds the threshold Ath is not less than a predetermined number Nth, that is, if the frequency N in which the cumulative value ΣA exceeds the threshold Ath is not less than the threshold Nth, the process proceeds to S105. As shown in Figure 5, in S105, the abnormality diagnosis unit 46 determines whether the wind direction deviation Δα does not change for a predetermined time t1 (e.g., a fixed time such as 10 minutes) or more even when wind direction tracking control is performed. If in S105 it is determined that the wind direction deviation Δα does not change for a predetermined time t1 or more even when wind direction tracking control is performed, the process proceeds to S106. If in S105 it is determined that the wind direction deviation Δα has changed within the predetermined time t1 as a result of performing wind direction tracking control, the process proceeds to S111.

[0026] In S106, the abnormality diagnosis unit 46 determines whether the temperature T obtained in S101 is less than or equal to the threshold Tth0. Here, the threshold Tth0 is the temperature that indicates the freezing point of water, and may be, for example, 0°C or a temperature near 0°C.

[0027] In S106, if it is determined that the temperature T is below the threshold Tth0, then in S107, the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state A as described below. State A means that the wind vane 8 is covered in ice (including the state in which the wind vane 8 is covered in snow due to snowfall), and in this state, the rotational resistance of the wind vane 8 increases, and there is a possibility that the rotating part is stuck and unable to rotate relative to the nacelle. For example, as shown in Figure 7, if the rotating part of the wind vane 8 is stuck while there is a deviation in the direction of the wind vane 8's vanes relative to the rotation axis of the wind turbine rotor 4, the deviation will not decrease even if the nacelle 3 is yaw turned by wind direction following control, and the wind direction following control will continue indefinitely. Note that the yaw angle of the nacelle 3 has limit angles in both clockwise and counterclockwise directions around a predetermined reference direction, so in wind direction following control, when the yaw angle of the nacelle 3 reaches the limit angle, the direction of rotation of the nacelle is changed to the opposite direction to continue wind direction following. In state A, if the wind power generation equipment 1 continues to operate while the wind direction cannot be accurately measured, it will become impossible to operate the wind turbine rotor 4 with the wind direction directly facing it (operation with the wind direction deviation Δα at or near zero), raising concerns about machine failure and a decrease in safety functions.

[0028] Therefore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state A, it may automatically send a notification to indicate that the wind vane 8 is in an icing state. The abnormality diagnosis unit 46 may send the notification outside the abnormality diagnosis system 40, or it may be displayed on, for example, a display unit 83 (see Figure 2) provided by the abnormality diagnosis system 40. Furthermore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state A, it may automatically stop the operation of the wind power generation equipment 1. That is, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state A, it may send a stop-operation instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to stop the operation of the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it stops the operation of the wind power generation equipment 1. The control by the control device 20 to stop the operation of the wind power generation equipment 1 may include, for example, a control to stop the power generation of the generator 11 by changing the blade pitch angle to the feather position.

[0029] In S106, if the temperature T measured by the thermometer 9 is determined to be not below the threshold Tth0, then in S108, the abnormality diagnosis unit 46 determines the state of the wind power generation equipment 1 to be state B as described below. State B means that signs of malfunction have appeared in the wind vane 8 or thermometer 9. In state B, if the operation of the wind power generation equipment 1 continues, the signal indicating the wind direction deviation Δα will not stabilize, causing the yaw rotation operation of the nacelle 3 to continue, and there is a concern that the yaw rotation mechanism 14 for controlling the yaw rotation of the nacelle 3 will fail. In addition, it will not be possible to operate the wind turbine rotor 4 facing the wind direction (operation with the wind direction deviation Δα at or near zero), raising concerns about machine failure and a decrease in safety functions.

[0030] Therefore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state B, it automatically sends a notification to inform the system that there are signs of a malfunction in the wind vane 8 or thermometer 9, and recommends maintenance of the wind vane 8 and thermometer 9. The notification recommending maintenance here may be a notification recommending planned replacement or planned repair, such as replacing or repairing parts of the wind vane 8 and thermometer 9 within a predetermined period (e.g., within one month). The abnormality diagnosis unit 46 may also send the notification outside the abnormality diagnosis system 40, or it may be displayed on a display unit 83 provided by the abnormality diagnosis system 40. If it is difficult to continue operating the wind power generation equipment 1 due to a malfunction of the wind vane 8, the operation of the wind power generation equipment 1 may be automatically stopped. That is, a stop-operation instruction signal may be sent to the control device 20 via the communication network 21 to instruct the control device 20 to stop operating the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it stops operating the wind power generation equipment 1. The control device 20 that stops the operation of the wind power generation equipment 1 may include, for example, control to change the blade pitch angle to the feather position to stop power generation by the generator 11 and control to stop the rotational movement of the yaw rotation mechanism 14.

[0031] If, in S105, it is determined that the wind direction deviation Δα has changed within a predetermined time t1 due to wind direction tracking control, then in S111, it is determined whether the wind direction deviation Δα has taken both positive and negative values ​​within the predetermined time t1 due to wind direction tracking control. If, in S111, it is determined that the wind direction deviation Δα has taken both positive and negative values ​​within the predetermined time t2 due to wind direction tracking control, the process proceeds to S113. If, in S111, it is determined that the wind direction deviation Δα has not taken either a positive or negative value or both within the predetermined time t2 due to wind direction tracking control, the process proceeds to S112.

[0032] In S112, the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state F as described below. State F means that there is an abnormality in the wiring of the wind vane 8. If the operation of the wind power generation equipment 1 continues in this state, the signal indicating the wind direction deviation Δα will not be stable, causing the yaw rotation of the nacelle 3 to continue, and there is a concern that the yaw rotation mechanism 14, which controls the yaw rotation of the nacelle 3, will fail. In addition, it will not be possible to operate the wind turbine rotor 4 facing the wind direction (operation with the wind direction deviation Δα to be 0 or near 0), raising concerns about machine failure and a decrease in safety functions.

[0033] Therefore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state F, it will send a notification recommending maintenance of the wind vane 8. This notification recommending maintenance may be a notification recommending planned replacement or repair of parts of the wind vane 8 within a predetermined period (for example, within one month). The abnormality diagnosis unit 46 may also send the notification outside the abnormality diagnosis system 40, or it may be displayed on a display unit 83 provided by the abnormality diagnosis system 40. If it becomes difficult to continue operating the wind power generation equipment 1 due to a malfunction of the wind vane 8, the operation of the wind power generation equipment 1 may be automatically stopped. That is, a stop-operation instruction signal may be sent to the control device 20 via the communication network 21 to instruct the control device 20 to stop operating the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it will stop operating the wind power generation equipment 1. The control device 20 that stops the operation of the wind power generation equipment 1 may include, for example, control that changes the blade pitch angle to the feather position to stop the power generation of the generator 11.

[0034] In S113, it is determined whether the current wind direction measured using the wind vane 8 is a specific wind direction unique to the wind power generation facility 1 or a specific wind direction unique to the wind farm site including the wind power generation facility 1. Here, "specific wind direction" refers to a specific wind direction that tends to cause greater wind direction turbulence due to site conditions, and is investigated in advance for each wind power generation facility 1 or for each wind farm site including the wind power generation facility 1, and is stored in the storage unit 50 in association with the wind power generation facility 1 or the wind farm site. In S113, it is read from the storage unit 50 and compared with the wind direction measured by the wind vane 8.

[0035] In S113, if the current wind direction measured using the wind vane 8 is determined to be a specific wind direction unique to the wind power generation equipment 1 or a specific wind direction unique to the wind farm site including the wind power generation equipment 1, then in S114, the abnormality diagnosis unit 46 determines the state of the wind power generation equipment 1 to be state D. State D means that the nacelle is rotating frequently due to the current wind direction being a specific wind direction unique to the wind power generation equipment 1 or a specific wind direction unique to the wind farm site including the wind power generation equipment 1. In state D, there is a concern that frequent yaw rotation may cause a failure in the yaw rotation mechanism 14. In addition, there is a concern that fatigue load may accumulate, leading to premature deterioration or failure of other mechanical parts. Furthermore, the increased unnecessary yaw rotation will increase power consumption.

[0036] Therefore, when the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state D, it operates the wind power generation equipment 1 in load suppression mode. That is, when the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state D, it transmits a load suppression mode instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to operate the wind power generation equipment 1 in load suppression mode. When the control device 20 receives the load suppression mode instruction signal, it operates the wind power generation equipment 1 in load suppression mode. The load suppression mode here refers to a mode in which the wind load acting on the wind turbine blades 6 is suppressed more than in the normal operation mode. The load suppression mode may also be a mode in which the blade pitch angle is controlled to the feather side more than in the normal operation mode. In load suppression mode, the control device 20 may, for example as shown in Figure 10, reduce the target output of the generator 11, which is determined according to the wind speed, to a smaller value than in the normal operation mode, and, for example as shown in Figure 11, close the target blade pitch angle, which is determined according to the output of the generator 11, to the feather side more than in the normal operation mode, thereby suppressing the output of the generator 11 more than in the normal operation mode. Furthermore, in order to confirm the validity of the determination of state D and to set the amount of suppression, the influence of the topography and the magnitude of wind direction changes at the location where the wind power generation equipment 1 is installed may be checked, and the setting values ​​for load suppression may be optimized.

[0037] Furthermore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state D, it may automatically stop the operation of the wind power generation equipment 1. That is, it may send a stop-operation instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to stop the operation of the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it stops the operation of the wind power generation equipment 1. The control by the control device 20 to stop the operation of the wind power generation equipment 1 may include, for example, a control that changes the blade pitch angle to the feather position to stop the power generation of the generator 11.

[0038] In S115, the abnormality diagnosis unit 46 determines whether the wind speed turbulence intensity It is greater than or equal to the threshold Itth. The wind speed turbulence intensity (wind speed turbulence strength) is the ratio of the standard deviation of the wind speed to the average wind speed, and is calculated based on the wind speed time series data acquired in S101. Also, as shown in Figure 8, the threshold Itth may decrease as the wind speed increases.

[0039] In S115, if it is determined that the wind speed turbulence intensity It is greater than or equal to the threshold Itth, then in S116, the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state E as described below. State E means that yaw turns are frequently performed due to a situation in which wind conditions are temporarily turbulent, such as a typhoon or a bomb cyclone. In state E, there is a concern that frequent yaw turns may cause a failure in the yaw turning mechanism 14. In addition, there is a concern that fatigue loads may accumulate, leading to premature deterioration or failure of other mechanical parts. Furthermore, the increased unnecessary yaw turning motion will increase power consumption.

[0040] Therefore, when the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state E, it operates the wind power generation equipment 1 in load suppression mode. That is, when the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state E, it transmits a load suppression mode instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to operate the wind power generation equipment 1 in load suppression mode. When the control device 20 receives the load suppression mode instruction signal, it operates the wind power generation equipment 1 in load suppression mode. The load suppression mode here refers to a mode in which the wind load acting on the wind turbine blades 6 is suppressed more than in the normal operation mode. The load suppression mode may also be a mode in which the blade pitch angle is controlled to the feather side more than in the normal operation mode. In load suppression mode, the control device 20 may, for example as shown in Figure 11, close the target blade pitch angle, which is determined according to the output of the generator 11, to the feather side more than in the normal operation mode in the high wind speed range, thereby suppressing the output of the generator 11 and the wind load acting on the wind turbine blades 6 more than in the normal operation mode. Furthermore, in order to confirm the validity of the determination of state E and to set the amount of suppression, the influence of the terrain at the location where the wind power generation equipment 1 is installed and the magnitude of wind direction changes may be checked, and the setting values ​​for load suppression may be optimized. Also, if it is a transient event associated with the passage of a typhoon or low pressure system, the system may be returned to normal operation mode after the condition improves.

[0041] Furthermore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state E, it may automatically stop the operation of the wind power generation equipment 1. That is, it may send a stop-operation instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to stop the operation of the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it stops the operation of the wind power generation equipment 1. The control by the control device 20 to stop the operation of the wind power generation equipment 1 may include, for example, a control that changes the blade pitch angle to the feather position to stop the power generation of the generator 11.

[0042] In S115, if it is determined that the wind speed turbulence intensity It is not equal to or greater than the threshold Itth, then in S117, the abnormality diagnosis unit 46 determines the state of the wind power generation equipment 1 to be state C as described below. State C is a state in which signs of failure have appeared in the wind direction indicator 8 due to wear of the potentiometer inside the wind direction indicator 8. If the operation of the wind power generation equipment 1 is continued in state C, the signal indicating the wind direction deviation Δα will not be stable, causing the yaw rotation operation of the nacelle 3 to continue, and there is a concern that the yaw rotation mechanism 14 for controlling the yaw rotation of the nacelle 3 will fail. In addition, it will not be possible to operate the wind turbine rotor 4 facing the wind direction (operation with the wind direction deviation Δα at or near zero), raising concerns about machine failure and a decrease in safety functions.

[0043] Therefore, if the abnormality diagnosis unit 46 determines that the state of the wind power generation equipment 1 is state C, it will send a notification to inform the system that there are signs of a malfunction in the wind vane 8 and recommend maintenance of the wind vane 8. The notification recommending maintenance here may be a notification recommending planned replacement or planned repair, such as replacing or repairing parts of the wind vane 8 within a predetermined period (for example, within one month). The abnormality diagnosis unit 46 may send the notification outside the abnormality diagnosis system 40, or it may be displayed on a display unit 83 provided in the abnormality diagnosis system 40. If it is difficult to continue operating the wind power generation equipment 1 due to a malfunction of the wind vane 8, the operation of the wind power generation equipment 1 may be automatically stopped. That is, a stop-operation instruction signal may be sent to the control device 20 via the communication network 21 to instruct the control device 20 to stop operating the wind power generation equipment 1. When the control device 20 receives the stop-operation instruction signal, it stops operating the wind power generation equipment 1. The control device 20 that stops the operation of the wind power generation equipment 1 may include, for example, control that changes the blade pitch angle to the feather position to stop the power generation of the generator 11.

[0044] This disclosure is not limited to the embodiments described above, but also includes modified forms of the embodiments described above, as well as forms that combine these forms as appropriate.

[0045] In some embodiments, for example in S102, it is not necessary to count the number of times N the cumulative value ΣA exceeds the threshold Ath. In this case, for example in S103, it may be determined whether or not the cumulative value ΣA exceeds the threshold Ath, and if the cumulative value ΣA does not exceed the threshold Ath, the process may proceed to S104, and if the cumulative value ΣA exceeds the threshold Ath, the process may proceed to S105.

[0046] In some embodiments, for example, in S102, it is not necessary to calculate the cumulative value ΣA of the nacelle rotation amount. In this case, the abnormality diagnosis system 40 may, for example, count the number of nacelle rotations during a predetermined period in S102, determine in S103 whether the number of nacelle rotations during the predetermined period exceeds a threshold, proceed to S104 if the number of nacelle rotations during the predetermined period does not exceed the threshold, and proceed to S105 if the number of nacelle rotations during the predetermined period exceeds the threshold.

[0047] The contents described in each of the above embodiments can be understood, for example, as follows:

[0048] [1] An anomaly diagnosis system for wind power generation equipment according to at least one embodiment of the present disclosure (e.g., the anomaly diagnosis system 40 described above) An anomaly diagnosis system for wind power generation equipment, for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation (for example, the wind direction deviation Δα mentioned above), then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the amount of rotation of the nacelle over a predetermined period (e.g., 1 hour) (e.g., the cumulative value ΣA mentioned above) and the number of rotations.

[0049] According to the abnormality diagnosis system for wind power generation equipment described in [1] above, since the abnormality diagnosis of the wind vane is performed based on at least one of the cumulative value of the nacelle rotation amount and the number of rotations over a predetermined period, a dedicated motor is not required to detect abnormalities in the wind vane compared to the abnormality diagnosis method of Patent Document 1, and abnormalities in the wind vane of wind power generation equipment can be diagnosed with a simple configuration. Furthermore, if at least one of the cumulative value of the nacelle rotation amount and the number of rotations over a predetermined period is sufficiently small, it is considered that the control that reduces the absolute value of the wind direction deviation (wind direction following control) is being performed appropriately, and no abnormality has occurred in the wind vane, so it is possible to continue operating the wind power generation equipment. For this reason, it is possible to suppress the decrease in the operating rate of the wind power generation equipment based on the diagnosis results of the abnormality diagnosis unit.

[0050] [2] In some embodiments, the abnormality diagnosis system for wind power generation equipment described in [1] above, The abnormality diagnosis system is configured to calculate the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and to diagnose the wind vane as normal if the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is smaller than a second threshold (e.g., the predetermined number of times Nth mentioned above).

[0051] According to the abnormality diagnosis system for wind power generation equipment described in [2] above, by setting appropriate first and second thresholds to determine whether the control that reduces the absolute value of the wind direction deviation (wind direction following control) is being performed appropriately, it is possible to accurately determine that there is no abnormality in the wind vane. Therefore, it is possible to suppress the decrease in the operating rate of the wind power generation equipment based on the diagnosis results of the abnormality diagnosis unit.

[0052] [3] In some embodiments, the abnormality diagnosis system for wind power generation equipment described in [1] or [2] above, The abnormality diagnosis system is configured to shut down the operation of the wind power generation facility if all of the following conditions (a), (b), and (c) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (b) The wind direction deviation does not change for a predetermined time (for example, the predetermined time t1 described above). (c) The measured temperature in the wind power generation facility (for example, the temperature T mentioned above) is below the temperature at which water freezes (for example, the threshold Tth0 mentioned above).

[0053] In the above-mentioned wind power generation facility, if all conditions (a), (b), and (c) are met, it means that the wind vane is covered in ice. In this case, if the wind power generation facility continues to operate in a state where accurate wind direction cannot be measured, it will not be possible to operate the wind turbine rotor in a way that is directly aligned with the wind direction (operation that makes the wind direction deviation 0 or close to 0), which raises concerns about machine failure and a decrease in safety functions. For this reason, as described in [3] above, if all conditions (a), (b), and (c) are met, the operation of the wind power generation facility can be stopped to suppress damage to the wind power generation facility. In addition, the occurrence of serious accidents caused by damage to the wind power generation facility can be suppressed and public safety can be ensured.

[0054] [4] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [3] above, The anomaly diagnosis system is configured to issue a notification recommending maintenance of the wind vane and thermometer of the wind power generation equipment if all of the following conditions (a), (b), and (d) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (b) The wind direction deviation does not change for a predetermined time (for example, the predetermined time t1 described above). (d) The measured temperature in the wind power generation facility (e.g., the temperature T mentioned above) is not below the temperature that indicates the freezing point of water (e.g., the threshold Tth0 mentioned above).

[0055] In the above-mentioned wind power generation facility, if all of conditions (a), (b), and (d) are met, it means that signs of malfunction have appeared in the wind vane or thermometer. In this case, if the operation of the wind power generation facility is continued, the signal indicating the wind direction deviation will not be stable, causing the nacelle to continue yaw rotation, and there is a concern that the equipment for controlling the nacelle's yaw rotation will fail. In addition, it will become impossible to operate the wind turbine rotor facing the wind direction, raising concerns about mechanical failure and a decrease in safety functions. For this reason, as described in [4] above, if all of conditions (a), (b), and (d) are met, a notice recommending maintenance of the wind vane and thermometer of the wind power generation facility can be issued, thereby suppressing damage to the wind power generation facility. In addition, the occurrence of serious accidents caused by damage to the wind power generation facility can be suppressed, and public safety can be ensured. Furthermore, the workload on workers can be reduced by avoiding sudden construction work.

[0056] [5] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [4] above, The abnormality diagnosis system is configured to shut down the operation of the wind power generation facility if all of the following conditions (a), (b), and (d) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (b) The wind direction deviation does not change for a predetermined time (for example, the predetermined time t1 described above). (d) The measured temperature in the wind power generation facility (e.g., the temperature T mentioned above) is not below the temperature that indicates the freezing point of water (e.g., the threshold Tth0 mentioned above).

[0057] In the above-mentioned wind power generation facility, if all conditions (a), (b), and (d) are met, it means that signs of malfunction have appeared in the wind vane or thermometer. In this case, if the operation of the wind power generation facility is continued, the signal indicating the wind direction deviation will not be stable, causing the nacelle to continue yaw rotation, and there is a concern that the equipment for controlling the nacelle's yaw rotation will fail. In addition, it will become impossible to operate the wind turbine rotor facing the wind direction, raising concerns about machine failure and a decrease in safety functions. For this reason, as described in [5] above, if all conditions (a), (b), and (d) are met, the operation of the wind power generation facility can be stopped to suppress damage to the wind power generation facility. In addition, the occurrence of serious accidents caused by damage to the wind power generation facility can be suppressed and public safety can be ensured. In addition, the workload on workers can be reduced by avoiding sudden construction work.

[0058] [6] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [5] above, The anomaly diagnosis system is configured to issue a notification recommending maintenance of the wind vane when the following conditions (a) and (e) are met and condition (f) is not met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (e) The wind direction deviation changes within a predetermined time (for example, the predetermined time t1 described above). (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time (for example, the predetermined time t1 mentioned above).

[0059] In the above-mentioned wind power generation facility, if conditions (a) and (e) are met but condition (f) is not met, it means that there is a problem with the wiring of the wind vane. In this case, if the operation of the wind power generation facility is continued, the signal indicating the wind direction deviation will not be stable, which may cause the nacelle to continue yaw rotation, and there is a concern that the yaw rotation mechanism that controls the nacelle's yaw rotation may fail. In addition, it will become impossible to operate the wind turbine rotor facing the wind direction, which may lead to mechanical failure and a decrease in safety functions. For this reason, as described in [6] above, if conditions (a) and (e) are met but condition (f) is not met, a notice recommending maintenance of the wind vane can be issued, thereby performing maintenance on the wind vane and suppressing damage to the wind power generation facility. In addition, the occurrence of serious accidents caused by damage to the wind power generation facility can be suppressed and public safety can be ensured. In addition, the workload on workers can be reduced by avoiding sudden construction work.

[0060] [7] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [6] above, The abnormality diagnosis system calculates the cumulative value of the yaw rotation of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds the first threshold is less than the second threshold, the wind power generation equipment is operated in normal operation mode. The abnormality diagnosis system is configured to operate the wind power generation equipment in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment more than the normal operating mode when all of the following conditions (a), (e), (f), and (g) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (e) The wind direction deviation changes within a predetermined time (for example, the predetermined time t1 described above). (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time (for example, the predetermined time t1 mentioned above). (g) The abnormality diagnosis system compares the wind direction measured by the wind vane with a specific wind direction, and the wind direction measured by the wind vane matches the specific wind direction.

[0061] In the above-mentioned wind power generation facility, if all of conditions (a), (e), (f), and (g) are met, it means that the nacelle is frequently rotating due to the wind direction being a specific wind direction unique to the wind power generation facility or a specific wind direction unique to the site of the wind farm including the wind power generation facility (a specific wind direction in which wind direction turbulence tends to be large due to the location conditions of the wind power generation facility). In this case, there is a concern that frequent yaw rotation may cause failure of the yaw rotation mechanism. In addition, there is a concern that the accumulation of fatigue load may lead to premature deterioration or failure of other mechanical parts. Furthermore, the increased unnecessary yaw rotation will increase power consumption. For this reason, as described in [7] above, if all of conditions (a), (e), (f), and (g) are met, operating the wind power generation facility in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation facility compared to the normal operating mode can suppress the occurrence of damage caused by fatigue load and suppress the decrease in the operating rate of the wind power generation facility. Furthermore, it can help prevent serious accidents caused by damage to wind power generation equipment, thereby ensuring public safety.

[0062] [8] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [7] above, The abnormality diagnosis system calculates the cumulative value of the yaw rotation of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds the first threshold is less than the second threshold, the wind power generation equipment is operated in normal operation mode. The abnormality diagnosis system is configured to operate the wind power generation equipment in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment more than the normal operating mode when all of the following conditions (a), (e), (f), (h), and (i) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (e) The wind direction deviation changes within a predetermined time (for example, the predetermined time t1 described above). (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time (for example, the predetermined time t1 mentioned above). (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction, (i) The intensity of wind turbulence (e.g., the turbulence intensity It) calculated based on the wind speed measured by the anemometer of the wind power generation facility is greater than or equal to the third threshold (e.g., the threshold Itth).

[0063] In the above-mentioned wind power generation equipment, if all of conditions (a), (e), (f), (h), and (i) are met, it means that yaw rotation is frequently performed due to conditions that cause temporary wind disturbances such as typhoons and bomb cyclones. In this case, there is a concern that frequent yaw rotation may cause failure of the yaw rotation mechanism. In addition, there is a concern that the accumulation of fatigue load may lead to premature deterioration or failure of other mechanical parts. Furthermore, the increased unnecessary yaw rotation will increase power consumption. For this reason, as described in [8] above, when all of conditions (a), (e), (f), (h), and (i) are met, operating the wind power generation equipment in an operating mode that suppresses the wind load acting on the wind turbine blades more than in the normal operating mode can suppress the occurrence of damage caused by fatigue load and prevent a decrease in the operating rate of the wind power generation equipment. Furthermore, it is possible to suppress the occurrence of serious accidents caused by damage to the wind power generation equipment and ensure public safety. In addition, it is possible to reduce the workload on workers by avoiding sudden construction work.

[0064] [9] In some embodiments, in the abnormality diagnosis system for wind power generation equipment described in any of [1] to [8] above, The anomaly diagnosis system is configured to issue a notification recommending maintenance of the wind vane if all of the following conditions (a), (e), (f), (h), and (j) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (e) The wind direction deviation changes within a predetermined time (for example, the predetermined time t1 described above). (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time (for example, the predetermined time t1 mentioned above). (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction, (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility (for example, the turbulence intensity It mentioned above) is not equal to or greater than the third threshold (for example, the threshold Itth mentioned above).

[0065] In the above-mentioned wind power generation equipment, if all conditions (a), (e), (f), (h), and (j) are met, it indicates that the wind vane is showing signs of malfunction due to wear of the potentiometer inside the wind vane. In this case, if the operation of the wind power generation equipment continues, the signal indicating the wind direction deviation will not stabilize, causing the nacelle to continue its yaw rotation, and there is a concern that the yaw rotation mechanism 14 for controlling the nacelle's yaw rotation will fail. In addition, it will become impossible to operate the wind turbine rotor facing the wind direction, raising concerns about mechanical failure and a decrease in safety functions. For this reason, as described in [9] above, if all conditions (a), (e), (f), (h), and (j) are met, operating the wind power generation equipment in an operating mode that suppresses the wind load acting on the wind turbine blades more than in the normal operating mode can suppress the occurrence of damage caused by fatigue loads, while also suppressing a decrease in the operating rate of the wind power generation equipment. Furthermore, it is possible to suppress the occurrence of serious accidents caused by damage to the wind power generation equipment and ensure public safety. Furthermore, it can reduce the workload on workers by avoiding unexpected construction work.

[0066]

[10] In some embodiments, in an abnormality diagnosis system for wind power generation equipment described in any of [1] to [9] above, The abnormality diagnosis system is configured to shut down the operation of the wind power generation facility if all of the following conditions (a), (e), (f), (h), and (j) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle (e.g., the cumulative amount ΣA mentioned above) at predetermined intervals (e.g., every hour), and the frequency (e.g., the number of times N mentioned above) at which the calculated cumulative amount exceeds a first threshold (e.g., the threshold Ath mentioned above) is not less than a second threshold (e.g., the predetermined number of times Nth mentioned above). (e) The wind direction deviation changes within a predetermined time (for example, the predetermined time t1 described above). (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time (for example, the predetermined time t1 mentioned above). (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction, (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility (for example, the turbulence intensity It mentioned above) is not equal to or greater than the third threshold (for example, the threshold Itth mentioned above).

[0067] In the above-mentioned wind power generation equipment, if all conditions (a), (e), (f), (h), and (j) are met, it indicates that the wind vane is showing signs of malfunction due to wear of the potentiometer inside the wind vane. In this case, if the operation of the wind power generation equipment is continued, the signal indicating the wind direction deviation will not stabilize, causing the nacelle to continue its yaw rotation, and there is a concern that the yaw rotation mechanism 14, which controls the nacelle's yaw rotation, will fail. In addition, it will become impossible to operate the wind turbine rotor facing the wind direction, raising concerns about machine failure and a decrease in safety functions. For this reason, as described in [9] above, by stopping the operation of the wind power generation equipment when all conditions (a), (e), (f), (h), and (j) are met, it is possible to suppress the occurrence of damage caused by fatigue loads, etc., while suppressing a decrease in the operating rate of the wind power generation equipment. In addition, it is possible to suppress the occurrence of serious accidents caused by damage to the wind power generation equipment, etc., and ensure public safety. In addition, it is possible to reduce the workload on workers by avoiding sudden construction work.

[0068]

[11] A method for diagnosing abnormalities in a wind power generation facility according to at least one embodiment of the present disclosure, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation (for example, the wind direction deviation Δα mentioned above), then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes the step of diagnosing an abnormality in the wind vane of the wind power generation facility based on at least one of the cumulative value of the amount of rotation of the nacelle over a predetermined period (e.g., 1 hour) (e.g., the cumulative value ΣA mentioned above) and the number of rotations.

[0069] According to the wind turbine abnormality diagnosis method described in

[11] above, since the wind vane abnormality diagnosis is performed based on at least one of the cumulative value of the nacelle rotation amount and the number of rotations over a predetermined period, compared to the abnormality diagnosis method of Patent Document 1, a dedicated motor is not required to detect abnormalities in the wind vane, and abnormalities in the wind vane of a wind turbine can be diagnosed with a simple configuration. Furthermore, if at least one of the cumulative value of the nacelle rotation amount and the number of rotations over a predetermined period is sufficiently small, it is considered that the control that reduces the wind direction deviation (wind direction following control) is being performed appropriately, and no abnormality has occurred in the wind vane, so it is possible to continue operating the wind turbine. For this reason, it is possible to suppress the decrease in the operating rate of the wind turbine based on the diagnosis results of the abnormality diagnosis unit. [Explanation of Symbols]

[0070] 1. Wind power generation facilities 2 pillars 3 Nasser 4 Wind turbine rotors 5 rotorheads 6 windmill blade 7 Anemometer 8 Wind vane 9 Thermometer 10 Speed ​​increaser 11 Generators 12. Wing pitch mechanism 14. Yaw rotation mechanism 15. Wing pitch angle sensor 18 Yaw angle sensor 20 Control device 21 Communication Networks 40 Anomaly Diagnosis System 42 Measurement data acquisition unit 44 Turning data calculation unit 46. ​​Department of Abnormal Diagnosis 50 Storage section 72 processors 74 RAM 76 ROM 78 HDD 80 Input Interfaces 82 Output Interfaces 83 Display 84 Bus

Claims

1. An anomaly diagnosis system for wind power generation equipment, for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The abnormality diagnosis system is configured to shut down the operation of the wind power generation equipment when all of the following conditions (a), (b), and (c) are met, and is an abnormality diagnosis system for wind power generation equipment. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (c) The measured temperature at the wind power generation facility is below the temperature at which water freezes.

2. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The anomaly diagnosis system for a wind turbine is configured to issue a notification recommending maintenance of the wind vane and thermometer of the wind turbine when all of the following conditions (a), (b), and (d) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (d) The measured temperature at the wind power generation facility is not below the temperature at which water freezes.

3. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The aforementioned abnormality diagnosis system is configured to shut down the operation of the wind power generation equipment when all of the following conditions (a), (b), and (d) are met, and is an abnormality diagnosis system for wind power generation equipment. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (d) The measured temperature at the wind power generation facility is not below the temperature at which water freezes.

4. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The anomaly diagnosis system for wind power generation equipment is configured to issue a notification recommending maintenance of the wind vane when the following conditions (a) and (e) are met and condition (f) is not met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time.

5. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The abnormality diagnosis system calculates the cumulative value of the yaw rotation of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds a first threshold is less than that of a second threshold, the wind power generation equipment is operated in normal operation mode. The abnormality diagnosis system is configured to operate the wind power generation equipment in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment more than the normal operating mode when all of the following conditions (a), (e), (f), and (g) are met, for use in a wind power generation equipment. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (g) The abnormality diagnosis system compares the wind direction measured by the wind vane with a specific wind direction, and the wind direction measured by the wind vane matches the specific wind direction.

6. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The abnormality diagnosis system calculates the cumulative value of the yaw rotation of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds a first threshold is less than that of a second threshold, the wind power generation equipment is operated in normal operation mode. The abnormality diagnosis system for a wind power generation facility is configured to operate the wind power generation facility in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation facility more than the normal operating mode when all of the following conditions (a), (e), (f), (h), and (i) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (i) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is equal to or greater than the third threshold.

7. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The anomaly diagnosis system for a wind turbine is configured to issue a notification recommending maintenance of the wind vane when all of the following conditions (a), (e), (f), (h), and (j) are met. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is not equal to or greater than the third threshold.

8. An abnormality diagnosis system for wind power generation equipment for performing abnormality diagnosis of wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis system is configured to diagnose abnormalities in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations over a predetermined period. The aforementioned abnormality diagnosis system is configured to shut down the operation of the wind power generation equipment when all of the following conditions (a), (e), (f), (h), and (j) are met, and is an abnormality diagnosis system for wind power generation equipment. (a) The abnormality diagnosis system calculates the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative amount exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis system compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is not equal to or greater than the third threshold.

9. The abnormality diagnosis system for a wind power generation facility according to any one of claims 1 to 8, wherein the abnormality diagnosis system is configured to calculate the cumulative amount of yaw rotation of the nacelle at predetermined intervals, and diagnoses the wind vane as normal when the frequency with which the calculated cumulative amount exceeds a first threshold is less than a second threshold.

10. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The above-mentioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, which shuts down the operation of the wind power generation facility when all of the following conditions (a), (b), and (c) are met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (c) The measured temperature at the wind power generation facility is below the temperature at which water freezes.

11. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The aforementioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, which issues a notification recommending maintenance of the wind vane and thermometer of the wind power generation facility when all of the following conditions (a), (b), and (d) are met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (d) The measured temperature at the wind power generation facility is not below the temperature at which water freezes.

12. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The above-mentioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, which shuts down the operation of the wind power generation facility when all of the following conditions (a), (b), and (d) are met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (b) The wind direction deviation does not change for a predetermined period of time or longer. (d) The measured temperature at the wind power generation facility is not below the temperature at which water freezes.

13. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The aforementioned abnormality diagnosis method is a method for diagnosing abnormalities in wind power generation equipment, which issues a notification recommending maintenance of the wind vane when the following conditions (a) and (e) are met and condition (f) is not met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time.

14. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds the first threshold is less than the second threshold, the wind power generation equipment is operated in normal operation mode. The above-mentioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, wherein when all of the following conditions (a), (e), (f), and (g) are met, the wind power generation facility is operated in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation facility more than the normal operating mode. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (g) The abnormality diagnosis method involves comparing the wind direction measured by the wind vane with a specific wind direction, and confirming that the wind direction measured by the wind vane matches the specific wind direction.

15. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and if the frequency with which the calculated cumulative value exceeds the first threshold is less than the second threshold, the wind power generation equipment is operated in normal operation mode. The above-mentioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, wherein when all of the following conditions (a), (e), (f), (h), and (i) are met, the wind power generation facility is operated in an operating mode that suppresses the wind load acting on the wind turbine blades of the wind power generation facility more than the normal operating mode. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis method compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (i) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is equal to or greater than the third threshold.

16. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The aforementioned abnormality diagnosis method is a method for diagnosing abnormalities in wind power generation equipment, which issues a notification recommending maintenance of the wind vane when all of the following conditions (a), (e), (f), (h), and (j) are met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis method compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is not equal to or greater than the third threshold.

17. A method for diagnosing abnormalities in wind power generation equipment, If the angle that the wind direction makes with respect to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, then the wind power generation facility is configured to rotate the nacelle in such a way as to reduce the absolute value of the wind direction deviation. The abnormality diagnosis method includes a step of diagnosing an abnormality in the wind vane of the wind turbine based on at least one of the cumulative value of the nacelle's rotation amount and the number of rotations during a predetermined period. The aforementioned abnormality diagnosis method is a method for diagnosing abnormalities in a wind power generation facility, which shuts down the operation of the wind power generation facility when all of the following conditions (a), (e), (f), (h), and (j) are met. (a) The abnormality diagnosis method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and the frequency at which the calculated cumulative value exceeds the first threshold is not less than the second threshold. (e) The wind direction deviation changes within a predetermined time. (f) The wind direction deviation takes both positive and negative values ​​within a predetermined time. (h) The abnormality diagnosis method compares the wind direction measured using the wind vane with a specific wind direction, and if the wind direction measured using the wind vane does not match the specific wind direction. (j) The intensity of wind turbulence calculated based on the wind speed measured by the anemometer of the wind power generation facility is not equal to or greater than the third threshold.

18. The abnormality diagnosis method for a wind power generation facility according to any one of claims 10 to 17, wherein the method calculates the cumulative value of the yaw rotation amount of the nacelle at predetermined intervals, and diagnoses the wind vane as normal if the frequency of the calculated cumulative value exceeding a first threshold is less than a second threshold.

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