JP2024077810A - Anomaly diagnosis system and method for wind power generation equipment - Google Patents

Abstract

[Problem] To provide an abnormality diagnosis system for a wind power generation device that can suppress a decrease in the operating rate of the wind power generation equipment. [Solution] The system includes a measurement data acquisition unit configured to acquire the measured wind speed, measured output, and measured values of the blade pitch angle of the wind power generation equipment, a planned output acquisition unit configured to acquire the planned output determined from the power curve and measured wind speed of the wind power generation equipment, a calculated wind speed calculation unit configured to calculate a calculated wind speed based on the measured output and the measured values of the blade pitch angle, and an abnormality diagnosis unit configured to perform an abnormality diagnosis of the wind power generation equipment based on a comparison between the measured output and the planned output and a comparison between the measured wind speed and the calculated wind speed. [Selected Figure] Figure 3

Description

This disclosure relates to an abnormality diagnosis system and an abnormality diagnosis method for wind power generation equipment.

Patent Document 1 describes how, when there is a strong wind in a wind power generation facility and the wind speed value exceeds a predetermined value, cutout control is performed to stop power generation by changing the pitch angle of the wind turbine blades in order to protect the equipment. It also describes that when the difference between the calculated wind speed value calculated based on the output of the wind power generation facility and the blade pitch angle and the measured value of the anemometer exceeds a predetermined value, it is determined that an anemometer abnormality has occurred and cutout control is performed.

JP 2008-184932 A

However, in wind power generation equipment, deterioration and failures may occur not only in the anemometer but also in the wind vane, thermometer, blade pitch mechanism, etc. For this reason, by diagnosing the condition of the wind power generation equipment more specifically, it becomes possible to operate the equipment in an appropriate operating mode that can suppress deterioration and failures according to the diagnosis results, and to repair appropriate parts at the appropriate time, thereby suppressing a decrease in the availability of the wind power generation equipment. In this regard, the abnormality diagnosis system for wind power generation equipment described in Patent Document 1 has room for improvement in terms of improving the availability of the wind power generation equipment.

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 suppress a decrease in the operating rate of the wind power generation facility.

In order 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 includes:
a measurement data acquisition unit configured to acquire a measured wind speed, which is a measured value of a wind speed of a wind power generation facility, a measured output, which is a measured value of a generator output of the wind power generation facility, and a measured value of a blade pitch angle of the wind power generation facility;
a planned output acquisition unit configured to acquire a planned output, which is a planned value of a generator output of the wind power generation facility determined from a power curve of the wind power generation facility and the measured wind speed acquired by the measurement data acquisition unit;
a calculated wind speed calculation unit configured to calculate a calculated wind speed, which is a calculated value of the wind speed of the wind power generation facility, based on the measurement output acquired by the measurement data acquisition unit and the measurement value of the blade pitch angle;
an abnormality diagnosis unit configured to perform an abnormality diagnosis of the wind power generation facility based on a comparison between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit, and a comparison between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit;
Equipped with.

In order to achieve the above object, a method for diagnosing an abnormality in a wind power generation facility according to at least one embodiment of the present disclosure includes:
a data acquisition step of acquiring a measured wind speed, which is a measured value of the wind speed of the wind power generation facility, a measured output, which is a measured value of the generator output of the wind power generation facility, and a measured value of the blade pitch angle of the wind power generation facility;
a planned output acquisition step of acquiring a planned output, which is a planned value of a generator output of the wind power generation facility determined from a power curve of the wind power generation facility and the measured wind speed acquired in the data acquisition step;
a calculated wind speed calculation step of calculating a calculated wind speed, which is a calculated value of the wind speed of the wind power generation facility, based on the measurement output acquired in the data acquisition step and the measurement value of the blade pitch angle;
an abnormality diagnosis step of diagnosing an abnormality of the wind power generation facility based on a comparison between the measured output acquired in the data acquisition step and the planned output acquired in the planned output acquisition step, and a comparison between the measured wind speed acquired in the data acquisition step and the calculated wind speed calculated in the calculated wind speed calculation step;
Equipped with.

According to at least one embodiment of the present disclosure, an abnormality diagnosis system and an abnormality diagnosis method for a wind power generation device are provided that can suppress a decrease in the operating rate of the wind power generation facility.

1 is a diagram for explaining an example of the configuration of a wind power generation facility that is a target of abnormality diagnosis by an abnormality diagnosis system according to the present disclosure. 2 is a diagram showing an example of a hardware configuration of an abnormality diagnosis system 40 for performing an abnormality diagnosis of the wind power generation facility 1 shown in FIG. 1 . 3 is a block diagram for explaining the functional configuration of an abnormality diagnosis system 40 shown in FIG. 2. FIG. 4 is a diagram showing a part of a flow of abnormality diagnosis by the abnormality diagnosis system 40 shown in FIGS. 2 and 3 . FIG. 5 is a diagram showing a continuation of a part of the abnormality diagnosis flow shown in FIG. 4 . FIG. 6 is a diagram showing a continuation of a part of the abnormality diagnosis flow shown in FIG. 5 . FIG. 7 is a diagram showing a continuation of a part of the abnormality diagnosis flow shown in FIG. 6 . FIG. 8 is a diagram showing a continuation of a part of the abnormality diagnosis flow shown in FIG. 7 . FIG. 4 is a diagram showing an example of a power curve. 4 is a diagram showing an example of correlation information R1 indicating the relationship between the generator output, the blade pitch angle, and the wind speed in the wind power generation facility 1. FIG. FIG. 13 is a diagram showing an example of the calculation contents of a calculated wind speed calculation unit 46. FIG. 13 is a diagram showing an example of the relationship between the average wind speed and the turbulence intensity threshold Itth. FIG. 11 is a diagram showing an example of the relationship between wind speed and target output for each of a normal operation mode and an output suppression mode. FIG. 11 is a diagram showing an example of the relationship between wind speed and target output for each of a normal operation mode and an output optimization mode. FIG. 11 is a diagram showing an example of the relationship between wind speed and target output for each of a normal operation mode and a load reduction mode. FIG. 11 is a diagram showing an example of the relationship between the output of the generator 11 and the target blade pitch angle for each of a normal operation mode and a load suppression mode. FIG. 11 is a diagram showing an example of the relationship between wind speed and target output for each of a normal operation mode and a power optimization load suppression mode. FIG. 11 is a diagram showing an example of the relationship between the output of the generator 11 and the target blade pitch angle for each of a normal operation mode and a power optimization load suppression mode.

Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the invention.
For example, expressions expressing relative or absolute configuration, such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial," not only express such a configuration strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions indicating that things are in an equal state, such as "identical,""equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained.
On the other hand, the expressions "comprise,""include,""have,""includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

FIG. 1 is a diagram for explaining an example of the configuration of a wind power generation facility 1 that is a target of abnormality diagnosis by an abnormality diagnosis system 40 according to the present disclosure.
1, the wind power generation facility 1 includes a support 2 erected on a foundation or the like, a nacelle 3 installed at the upper end of the support 2, and a wind turbine rotor 4 rotatably provided on one end side of the nacelle 3. The wind turbine rotor 4 includes a rotor head 5 and a plurality of wind turbine blades 6 radially attached to the rotor head 5. The wind power generation facility 1 also includes a blade pitch mechanism 12 for adjusting the pitch angle of each of the wind turbine blades 6 (hereinafter referred to as "blade pitch angle"), and a yaw rotation mechanism 14 for adjusting the yaw angle of the nacelle 3.

Inside the nacelle 3, a generator 11 is installed that is connected to the wind turbine rotor 4 via a gearbox 10. The rotation of the wind turbine rotor 4 is transmitted to the generator 11 via the gearbox 10 to drive the generator 11, which outputs electric power.

The wind power generation facility 1 includes an anemometer 7 that measures the speed of the wind passing through the wind power generation facility 1, a wind vane 8 that measures the direction of the wind passing through the wind power generation facility 1, a thermometer 9 that measures the temperature, a pitch angle sensor 15 that measures the blade pitch angle, a generator output meter 16 that measures the output of the generator 11, and a yaw angle sensor 18 that measures the yaw angle αz of the nacelle 3. The anemometer 7, the anemometer 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 anemometer 7 may be, for example, a cup-type or a windmill-type anemometer. The cup-type anemometer measures the number of revolutions of a cup rotating around a rotating shaft with a rotary encoder or the like to measure the wind speed, and the windmill-type anemometer measures the number of revolutions of a propeller-like blade rotating around a rotating shaft with a rotary encoder or the like to measure the wind speed. The wind vane 8 may be, for example, a potentiometer-type wind vane that converts changes in the direction of an arrow feather into changes in electrical resistance, and measures the angle of the wind flow with respect to a predetermined reference direction (for example, north) as the wind direction. The yaw angle sensor 18 measures, for example, the angle of the rotation axis of the wind turbine rotor 4 with respect to the above-mentioned predetermined reference direction as the yaw angle of the nacelle 3. Hereinafter, the output of the generator 11 will be referred to as the "generator output."

A control device 20 is provided in an appropriate location of the wind power generation facility 1 (for example, inside the nacelle 3 or inside the support 2, etc.) to perform various operational controls of the wind power generation facility 1. The control device 20 receives signals indicating the measured wind speed Vm, which is the wind speed measured by the anemometer 7, the wind direction αw, which is the wind direction measured by the wind vane 8, the air temperature measured by the air temperature gauge 9, the blade pitch angle θ, which is the blade pitch angle measured by the pitch angle sensor 15, the measured output Pm, which is the generator output measured by the generator output meter 16, the yaw angle αz of the nacelle 3 measured by the yaw angle sensor 18, etc.

The control device 20 controls the blade pitch mechanism 12 to adjust the blade pitch angle to a blade pitch angle that is considered optimal based on various conditions such as the measured wind speed Vm measured by the anemometer 7. When the measured wind speed Vm measured by the anemometer 7 exceeds a predetermined cutout wind speed, the control device 20 performs cutout control to control the blade pitch angle to the feather position and automatically stop the rotation of the wind turbine rotor 4.

The control device 20 is also configured to be capable of executing wind direction tracking control, which is a control for tracking the wind direction so that the orientation of the wind turbine rotor 4 faces the wind direction. Specifically, the wind direction tracking control is a control for calculating the wind direction deviation Δα, which is the difference between the wind direction αw measured by the anemometer 8 and the yaw angle αz measured by the yaw angle sensor, and controlling the yaw rotation mechanism 14 to reduce the absolute value of the wind direction deviation Δα (preferably to make it 0) and adjust the yaw angle of the nacelle 3 when the absolute value of the wind direction deviation Δα exceeds a threshold value Δαth. Here, the wind direction deviation Δα is the angle that the wind direction measured by the anemometer 8 makes with respect to the rotation axis of the wind turbine rotor 4, and is calculated, for example, by subtracting the yaw angle αz from the wind direction αw.

The control device 20 is configured to be able to communicate with the abnormality diagnosis system 40 via the communication network 21. The control device 20 transmits various measurement data measured by the wind power generation facility 1 to the abnormality diagnosis system 40, such as the measured wind speed Vm, which is the wind speed measured by the anemometer 7, the wind direction measured by the anemometer 8, the temperature measured by the thermometer 9, the blade pitch angle θ, which is the blade pitch angle measured by the pitch angle sensor 15, the generator output Pm, which is the generator output measured by the generator output meter 16, and the yaw angle αz of the nacelle 3 measured by the yaw angle sensor 18. The abnormality diagnosis system 40 stores the various measurement data transmitted from the control device 20 as time-series data and uses it to diagnose abnormalities in the wind power generation facility 1, as described below.

Figure 2 is a diagram showing an example of the hardware configuration of the abnormality diagnosis system 40 shown in Figure 1. Figure 3 is a block diagram for explaining the functional configuration of the abnormality diagnosis system 40 shown in Figure 2.

2, the abnormality diagnosis system 40 includes, for example, a processor 72, a RAM (Random Access Memory) 74, a ROM (Read Only Memory) 76, a HDD (Hard Disk Drive) 78, an input I/F 80, an output I/F 82, and a display 83, and is configured using a computer connected to each other via a bus 84. The hardware configuration of the abnormality diagnosis system 40 is not limited to the above, and may be configured by a combination of a control circuit and a storage device. The abnormality diagnosis system 40 is also configured by a computer executing a program that realizes each function of the abnormality diagnosis system 40. The functions of each part in the abnormality diagnosis system 40 described below are realized, for example, by loading a program stored in the ROM 76 into the RAM 74 and executing it with the processor 72, and by reading and writing data in the RAM 74 and the ROM 76. The hardware that constitutes the abnormality diagnosis system 40 may be concentrated in one place, or may be distributed across multiple places. Below, we will explain an example in which the abnormality diagnosis system 40 is installed at a location away from the wind power generation facility 1 and performs abnormality diagnosis of the wind power generation facility 1 remotely, but each function of the abnormality diagnosis system 40 may be realized by, for example, a control device 20 provided in the wind power generation facility 1.

As shown in FIG. 3, the abnormality diagnosis system 40 includes a measurement data acquisition unit 42, a planned output acquisition unit 44, a calculated wind speed calculation unit 46, an abnormality diagnosis unit 48, and a memory unit 50. The functions of each unit of the abnormality diagnosis system 40 will be explained below with reference to FIGS. 4 to 8, etc.

Figure 4 is a diagram showing a part of the flow of abnormality diagnosis by the abnormality diagnosis system 40 shown in Figures 2 and 3. Figure 5 is a diagram showing a part of the continuation of the abnormality diagnosis flow shown in Figure 4. Figure 6 is a diagram showing a part of the continuation of the abnormality diagnosis flow shown in Figure 5. Figure 7 is a diagram showing a part of the continuation of the abnormality diagnosis flow shown in Figure 6. Figure 8 is a diagram showing a part of the continuation of the abnormality diagnosis flow shown in Figure 7.

As shown in FIG. 4, in S101, the measurement data acquisition unit 42 acquires time series data such as the measured wind speed Vm measured by the anemometer 7, the measured wind direction value measured by the wind vane 8, the measured air temperature value T measured by the thermometer 9, the blade pitch angle θ measured by the pitch angle sensor 15, the measured output Pm of the generator 11 measured by the generator output meter 16, and the yaw angle αz measured by the yaw angle sensor 18 from the control device 20 via the communication network 21.

In S102, the planned output acquisition unit 44 refers to the power curve Cp (see FIG. 9) acquired from the memory unit 50, identifies the planned output Pp, which is the planned value of the generator output corresponding to the measured wind speed Vm acquired by the measurement data acquisition unit 42, from the power curve Cp, and acquires the identified planned output Pp. As shown in FIG. 9, the power curve Cp is correlation information indicating the relationship between the wind speed and the predetermined planned value (planned output) of the generator output, and is stored in advance in the memory unit 50 and read out from the memory unit 50 in S102.

In S103, the abnormality diagnosis unit 48 compares the measured output Pm acquired in S101 with the planned output Pp acquired in S102, and calculates the difference ΔP between the measured output Pm and the planned output Pp. Here, the difference ΔP is a value obtained by subtracting the planned output Pp from the measured output Pm (=Pm-Pp). If the absolute value of the calculated difference ΔP is smaller than the threshold value ΔPth, in S104, the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state X described below. State X means that the wind power generation equipment 1 is in a normal state. If the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state X, it operates the wind power generation equipment 1 in the normal operation mode. That is, if the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be 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 the 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.

If the absolute value of the difference ΔP calculated in S103 is not smaller than the threshold ΔPth, the process proceeds to S105. As shown in FIG. 5, in S105, the calculated wind speed calculation unit 46 acquires and refers to correlation information R1 (see FIG. 10) indicating the relationship between the generator output, the blade pitch angle, and the wind speed in the wind power generation facility 1 from the storage unit 50, and calculates the calculated wind speed Vc, which is the calculated value of the wind speed, based on the measured output Pm acquired in S101, the measured value θ of the blade pitch angle, and the correlation information R1. For example, as shown in FIG. 11, the calculated wind speed calculation unit 46 may calculate the calculated wind speed Vc by adding the value output from the function F(P) by inputting the measured output Pm acquired in S101 into the predetermined function F(P) and the value output from the function F(θ) by inputting the measured value θ of the blade pitch angle acquired in S101 into the predetermined function F(θ).

In S106, the abnormality diagnosis unit 48 compares the measured wind speed Vm acquired in S101 with the calculated wind speed Vc calculated in S104, and calculates the difference ΔV between the measured wind speed Vm and the calculated wind speed Vc. Here, the difference ΔV is the measured wind speed Vm minus the calculated wind speed Vc (=Vm-Vc). If the absolute value of the calculated difference ΔV is smaller than the threshold value ΔVth, the process proceeds to S107, and if the absolute value of the difference ΔV is not smaller than the threshold value ΔVth, the process proceeds to S121.

In S107, the abnormality diagnosis unit 48 determines whether the temperature T acquired in S101 is lower than a threshold value Tthl (e.g., 10°C) and whether the difference ΔP calculated in S103 is greater than 0. If it is determined in S107 that the temperature T is lower than the threshold value Tthl and the difference ΔP is greater than 0, in S108 the abnormality diagnosis unit 48 determines that the state of the wind power generation facility 1 is state H described below. State H means a state in which the measured output Pm deviates from the planned output Pp due to the temperature T being lower than the threshold value Tthl and the air density being higher than normal.

When the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state H, the abnormality diagnosis unit 48 operates the wind power generation equipment 1 in the output suppression mode. That is, when the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state H, the abnormality diagnosis unit 48 transmits an output 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 the output suppression mode. When the control device 20 receives the output suppression mode instruction signal, the control device 20 operates the wind power generation equipment 1 in the output suppression mode. Note that the output suppression mode here is a mode in which the generator output is suppressed more than in the normal operation mode. The output suppression mode may be, for example, a mode in which the blade pitch angle is controlled to be more feather-side than in the normal operation mode. In the output suppression mode, the control device 20 may suppress the output of the generator 11 more than in the normal operation mode by making the target output of the generator 11 determined according to the wind speed smaller than in the normal operation mode, for example, as shown in FIG. 13.

If it is determined in S107 that the temperature T is not lower than the threshold value Tthl and that ΔP is not greater than 0, the process proceeds to S109.

In S109, the abnormality diagnosis unit 48 judges whether the temperature T acquired in S101 is higher than a threshold value Tthh (e.g., 20°C) and whether the difference ΔP calculated in S103 is smaller than 0. If it is judged in S109 that the temperature T is higher than the threshold value Tthh and the difference ΔP is smaller than 0, in S110, the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state I described below. State I means a state in which the measured output Pm deviates from the planned output Pp due to the temperature T being higher than the threshold value Tthh and the air density being lower than normal. When the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state I, the abnormality diagnosis unit 48 operates the wind power generation equipment 1 in the output optimization mode. That is, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state I, the abnormality diagnosis unit 48 transmits an output optimization 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 the output optimization mode. When the control device 20 receives the output optimization mode instruction signal, the control device 20 operates the wind power generation facility 1 in the output optimization mode. The output optimization mode here is an operation mode in which the generator output is increased by changing the blade pitch angle compared to the normal operation mode. The output optimization mode may be, for example, a mode in which the blade pitch angle is controlled to the finer side than the normal operation mode. However, in the output optimization mode, if the generator output does not increase even if the blade pitch angle is controlled to the finer side, the control device 20 may continue to operate the wind power generation facility 1 at the blade pitch angle at which the generator output is maximized. In the output optimization mode, the control device 20 may increase the output of the generator 11 compared to the normal operation mode by increasing the target output of the generator 11 determined according to the wind speed compared to the normal operation mode, as shown in FIG. 14, for example.

If it is determined in S109 that the temperature T is not higher than the threshold value Tthh and that ΔP is not smaller than 0, then in S111, the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state Z described below. State Z means that there is no abnormality in the anemometer 7, but some unknown event that prevents the proper operation of the wind power generation equipment 1 has occurred. When the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state Z, for example, it may transmit an operation stop instruction signal to the control device 20 via the communication network 21 to instruct the control device 20 to automatically stop the operation of the wind power generation equipment 1, or may transmit a notification indicating a request to dispatch an inspector to the wind power generation equipment 1. The abnormality diagnosis unit 48 may transmit the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 (see FIG. 2) provided in the abnormality diagnosis system 40. When the control device 20 receives the operation stop 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 facility 1 may include, for example, control to change the blade pitch angle to the feather position to stop power generation by the generator 11.

As shown in FIG. 6, in S121, it is determined whether the difference ΔP calculated in S103 is greater than 0. If it is determined in S121 that the difference ΔP is greater than 0, in S122, the abnormality diagnosis unit 48 determines whether the wind speed turbulence strength It is greater than or equal to a threshold value Itth. The wind speed turbulence strength (wind speed turbulence intensity) is the ratio of the standard deviation of the wind speed to the average wind speed, and is calculated based on the measured wind speed obtained in S101. Also, as shown in FIG. 12, the threshold value Itth may decrease as the wind speed increases.

If it is determined in S122 that the wind speed disturbance strength It is equal to or greater than the threshold Itth, then in S123, the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state G, as described below. State G means a state in which the measured output Pm is in excess of the planned output Pp due to the large strength of the wind speed disturbance (overperformance). If the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state G, it operates the wind power generation equipment 1 in the load suppression mode. That is, if the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state G, 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 the load suppression mode. If the control device 20 receives the load suppression mode instruction signal, it operates the wind power generation equipment 1 in the load suppression mode. The load suppression mode here is 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 be, for example, a mode in which the blade pitch angle is controlled to be more feather-side than in the normal operation mode. Specifically, in the load suppression mode, the control device 20 may suppress the wind load caused by the strength of the wind speed turbulence more than in the normal operation mode, for example, by independently controlling the blade pitch angle of each of the multiple wind turbine blades 6. In the load suppression mode, the control device 20 may reduce the target output of the generator 11 determined according to the wind speed, as shown in FIG. 15, for example, as compared to the normal operation mode, and may close the target blade pitch angle determined according to the output of the generator 11 to the feather side more than in the normal operation mode, as shown in FIG. 16, for example., to suppress the wind load acting on the wind turbine blades 6 more than in the normal operation mode.

If it is determined in S122 that the wind speed turbulence strength It is not equal to or greater than the threshold Itth, then in S124 the abnormality diagnosis unit 48 determines whether the air temperature T acquired in S101 is equal to or less than the threshold Tth0. Here, the threshold Tth0 is a temperature indicating the freezing point of water, and may be, for example, 0°C or a temperature close to 0°C. Note that the threshold Tth0 is a temperature lower than the threshold Tthl.

If it is determined in S124 that the temperature T is equal to or lower than the threshold value Tth0, in S125, the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state A described below. State A means that the anemometer 7 is iced (including a state in which the anemometer 7 is snowed on due to snowfall), and in this state, the rotation resistance of the anemometer 7 increases, and the rotating part may be stuck and unable to rotate. If the operation of the wind power generation equipment 1 is continued based on the measurement value of the anemometer 7 in a state in which the anemometer 7 is iced and cannot measure the wind speed accurately, safety stop control such as stopping operation due to high wind speed (for example, cutout control that stops the operation of the wind power generation equipment 1 when the wind speed exceeds the cutout wind speed) cannot be performed, and there is a concern that the machine may break down or the safety function may be deteriorated.

Therefore, when the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state A, it may send a notification to inform the user that the anemometer 7 is in an icy state. The abnormality diagnosis unit 48 may send the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 (see FIG. 2) provided in the abnormality diagnosis system 40. Furthermore, when the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state A, it may operate the wind power generation equipment 1 in the calculated wind speed operation mode. That is, when the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state A, it may send a calculated wind speed 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 the calculated wind speed operation mode. When the control device 20 receives the calculated wind speed operation mode instruction signal, it operates the wind power generation equipment 1 in the calculated wind speed operation mode. Furthermore, in this case, the control device 20 stops the operation of the wind power generation equipment 1 when the calculated wind speed Vc exceeds the cutout wind speed.

The calculated wind speed operation mode here is a mode in which the calculated wind speed Vc described above is used as the wind speed used to control the blade pitch angle instead of the measured wind speed Vm measured by the anemometer 7. That is, in the calculated wind speed operation mode, the control device 20 controls the blade pitch mechanism 12 to adjust the blade pitch angle to a blade pitch angle that is considered optimal based on the calculated wind speed Vc. In addition, when the calculated wind speed Vc exceeds a predetermined cutout wind speed in the calculated wind speed operation mode, the control device 20 executes cutout control to control the blade pitch angle to the feather position and stop power generation of the generator 11.

If it is determined in S124 that the temperature T is not equal to or lower than the threshold value Tth0, then in S126 the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state B described below. State B means that the anemometer 7 or the thermometer 9 shows signs of a malfunction. In the case of state B, if the operation of the wind power generation equipment 1 is continued in a state where the wind speed cannot be measured accurately, safety stop control such as stopping operation due to high wind speed (for example, cutout control that stops the operation of the wind power generation equipment 1 when the wind speed exceeds the cutout wind speed) cannot be performed, and there is a concern that the machine may break down or safety functions may be deteriorated.

Therefore, when the abnormality diagnosis unit 48 judges that the state of the wind power generation equipment 1 is state B, it issues a notification to inform that the anemometer 7 or the thermometer 9 shows signs of failure, and recommends maintenance of the anemometer 7 and the thermometer 9. The notification recommending maintenance here may be, for example, a notification recommending planned replacement or planned repair of the anemometer 8 and the thermometer 9 within a predetermined period (for example, within one month). The abnormality diagnosis unit 48 may issue the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 (see FIG. 2) provided in the abnormality diagnosis system 40. In addition, if the above-mentioned difference ΔV is minor, the wind power generation equipment 1 may be operated in the calculated wind speed operation mode, as in the case of state A. In this case, the control device 20 stops the operation of the wind power generation equipment 1 when the calculated wind speed Vc exceeds the cut-out wind speed.

As shown in FIG. 7, in S131, the abnormality diagnosis unit 48 judges whether or not there is an abnormality in the above-mentioned wind direction tracking control. Specifically, for example, if the absolute value of the wind direction deviation Δα does not fall below the threshold value αth even when the wind direction tracking control is performed for a predetermined time t1 (for example, a certain period of time such as 10 minutes) or more, that is, if the state in which the absolute value of the wind direction deviation Δα exceeds the threshold value αth even when the wind direction tracking control is performed continues for a predetermined period of time t1 or more, the abnormality diagnosis unit 48 judges that there is an abnormality in the wind direction tracking control. Also, for example, if the absolute value of the wind direction deviation Δα falls below the threshold value αth within a predetermined time by performing the wind direction tracking control, the abnormality diagnosis unit 48 judges that there is no abnormality in the wind direction tracking control.

If it is determined in S131 that there is an abnormality in the wind direction tracking control, then in S132 the abnormality diagnosis unit 48 determines whether the absolute value of the wind direction deviation Δα does not change for a predetermined time t2 (for example, a fixed time such as 10 minutes) or more even when the wind direction tracking control is performed. If it is determined in S131 that there is an abnormality in the wind direction tracking control, the process proceeds to S141. If it is determined in S132 that the absolute value of the wind direction deviation Δα does not change for a predetermined time t2 or more, then in S133 the abnormality diagnosis unit 48 determines whether the temperature T measured by the thermometer 9 is equal to or lower than the threshold value Tth0.

If it is determined in S133 that the temperature T measured by the thermometer 9 is equal to or lower than the threshold value Tth0, then in S134, the abnormality diagnosis unit 48 determines that the state of the wind power generation facility 1 is state C described below. State C means that the anemometer 8 is iced (including a state in which the anemometer 8 is snowed on by snowfall), and in this state, the rotational resistance of the anemometer 8 increases, and the rotating part may be stuck and unable to rotate. If the rotating part of the anemometer 8 is stuck in a state in which there is a deviation in the direction of the anemometer 8's feathers relative to the rotation axis of the wind turbine rotor 4, the deviation will not decrease even if the nacelle 3 is rotated by the wind direction tracking control, and the wind direction tracking control will continue indefinitely. Note that the yaw angle of the nacelle 3 has limit angles in both the clockwise and counterclockwise directions around a predetermined reference direction, so in the wind direction tracking control, when the yaw angle of the nacelle 3 reaches the limit angle, the nacelle's rotation direction is changed to the opposite direction to continue wind direction tracking.

In the case of state C, if the operation of the wind power generation equipment 1 is continued in a state where the accurate wind direction cannot be measured, the operation with the wind turbine rotor 4 facing the wind direction (operation with the wind direction deviation Δα at 0 or close to 0) will not be possible, and there is a concern of mechanical failure and deterioration of safety functions. For this reason, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state C, it may send a notification to inform the user that the anemometer 8 is in an icy state. The abnormality diagnosis unit 48 may send the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 (see FIG. 2) provided in the abnormality diagnosis system 40. In addition, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state C, it may automatically stop the operation of the wind power generation equipment 1. That is, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state C, it may send an operation stop 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 operation stop command signal, it stops the operation of the wind power generation facility 1. The control by the control device 20 to stop the operation of the wind power generation facility 1 may include, for example, control to change the blade pitch angle to the feather position to stop power generation by the generator 11.

If it is determined in S132 that the wind direction deviation Δα has changed within a predetermined time by performing wind direction tracking control, then in S135 the abnormality diagnosis unit 48 determines the state of the wind power generation equipment 1 to be state Y described below. State Y means that the anemometer 8 is deteriorated, and although the operation of the wind power generation equipment 1 can be continued, it is desirable to replace the anemometer 8. Therefore, when the abnormality diagnosis unit 48 determines the state of the wind power generation equipment 1 to be state Y, it transmits a notification recommending planned replacement of the anemometer 8 within a predetermined period (for example, within one month). The abnormality diagnosis unit 48 may transmit the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 provided in the abnormality diagnosis system 40.

If it is determined in S133 that the temperature T measured by the thermometer 9 is not equal to or lower than the threshold value Tth0, then in S136 the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state D, as described below. State D is a state in which the anemometer 8 shows signs of failure, and if operation of the wind power generation equipment 1 is continued, the signal indicating the wind direction deviation Δα will not be stable, causing the yaw rotation of the nacelle 3 to continue, raising concerns that the equipment controlling the yaw rotation of the nacelle 3 may fail. In addition, it will no longer be possible to operate the wind turbine rotor 4 facing directly into the wind direction (operation with the wind direction deviation Δα at or near zero), raising concerns that this could lead to mechanical failure or a deterioration in safety functions.

For this reason, when the abnormality diagnosis unit 48 judges the state of the wind power generation facility 1 to be state D, it issues a notification to inform the user that the wind vane 8 shows signs of failure, and recommends maintenance of the wind vane 8. The notification recommending maintenance here may be, for example, a notification recommending planned replacement or planned repair of the wind vane 8 within a predetermined period (for example, within one month). The abnormality diagnosis unit 48 may issue the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 provided in the abnormality diagnosis system 40. In addition, when it is difficult to continue the operation of the wind power generation facility 1 due to a failure of the wind vane 8, for example, the operation of the wind power generation facility 1 may be automatically stopped. That is, an operation stop instruction signal for instructing the control device 20 to stop the operation of the wind power generation facility 1 may be transmitted to the control device 20 via the communication network 21. When the control device 20 receives the operation stop instruction signal, it stops the operation of the wind power generation facility 1. The control by the control device 20 to stop the operation of the wind power generation facility 1 may include, for example, control to change the blade pitch angle to the feather position to stop power generation by the generator 11.

As shown in FIG. 8, in S141, it is determined whether or not there is an abnormality in the pitch control. For example, the abnormality diagnosis unit 48 classifies data consisting of a combination of the ever-changing wind speed and the output of the generator 11 into wind speed sections, and determines that there is an abnormality in the pitch control if the peak-to-peak value of the generator output in the time series data of the generator output classified into wind speed sections is greater than the threshold value specified for each wind speed section. Furthermore, the abnormality diagnosis unit 48 determines that there is no abnormality in the pitch control if the peak-to-peak value of the generator output in the time series data of the generator output classified into wind speed sections is not greater than the threshold value specified for each wind speed section.

If it is determined in S141 that there is an abnormality in the pitch control, in S142 the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state E, as described below. State E means that the blade pitch mechanism 12 has worn down and deteriorated, and the blade pitch angle cannot be controlled to the optimal blade pitch angle according to the wind speed, resulting in a decrease in output performance. If the deterioration of the blade pitch mechanism 12 is left unattended, there is a concern that the degree of damage to the equipment will progress and become severe.

For this reason, when the abnormality diagnosis unit 48 judges the state of the wind power generation facility 1 to be state E, it issues a notification to inform the user that the blade pitch mechanism 12 is worn and deteriorated, and to recommend maintenance of the worn part of the blade pitch mechanism 12. The notification recommending maintenance here may be, for example, a notification recommending planned replacement or planned repair to replace or repair the worn part of the blade pitch mechanism 12 within a predetermined period (for example, within one month, etc.). The abnormality diagnosis unit 48 may issue the notification to the outside of the abnormality diagnosis system 40, or may display the notification on, for example, a display 83 (see FIG. 2) provided in the abnormality diagnosis system 40. Note that, when the deterioration of the blade pitch mechanism 12 progresses to an unacceptable level, the operation of the wind power generation facility 1 may be stopped (an operation stop instruction signal for instructing the control device 20 to stop the operation of the wind power generation facility 1 may be transmitted to the control device 20 via the communication network 21). Furthermore, when the deterioration of the blade pitch mechanism 12 is mild, the wind power generation equipment 1 may be operated in the above-mentioned load suppression mode in order to suppress the progression of the deterioration of the blade pitch mechanism 12. That is, when the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state E, the abnormality diagnosis unit 48 may transmit 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 the above-mentioned load suppression mode. When the control device 20 receives the load suppression mode instruction signal, it operates the wind power generation equipment 1 in the load suppression mode.

If it is determined in S141 that there is no abnormality in the pitch control, in S143 the abnormality diagnosis unit 48 determines whether the wind speed turbulence strength It is equal to or greater than the threshold value Itth. The determination method in S143 is the same as the determination method in S122, so a description thereof will be omitted.

If it is determined in S143 that the wind speed disturbance strength It is equal to or greater than the threshold Itth, then in S144, the abnormality diagnosis unit 48 determines the state of the wind power generation equipment 1 to be state F, as described below. State F means a state in which the measured output Pm is less than the planned output Pp due to the large strength of the wind speed disturbance (performance degradation). If the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state F, it may operate the wind power generation equipment 1 in the output optimization load suppression mode. That is, if the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state F, it may transmit an output optimization 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 the output optimization load suppression mode. If the control device 20 receives the output optimization load suppression mode instruction signal, it operates the wind power generation equipment 1 in the output optimization load suppression mode. The output optimization load suppression mode may be, for example, a mode in which the blade pitch angle is controlled to be finer than in the normal operation mode to increase the generator output while suppressing the wind load acting on the wind turbine blades 6 more than in the normal operation mode by independently controlling the blade pitch angle of each of the multiple wind turbine blades 6. In the output optimization load suppression mode, the control device 20 may increase the target output of the generator 11 determined according to the wind speed more than in the normal operation mode, as shown in FIG. 17, and may suppress the wind load acting on the wind turbine blades 6 while increasing the output of the generator 11 by opening the target blade pitch angle determined according to the output of the generator 11 to the finer side than in the normal operation mode, as shown in FIG. 18.

If it is determined in S122 that the strength of the wind speed disturbance It is not equal to or greater than the threshold Itth, then in S145 the abnormality diagnosis unit 48 determines that the state of the wind power generation equipment 1 is state J. State J means that the anemometer is showing signs of failure. In the case of state J, if the operation of the wind power generation equipment 1 is continued in a state where the wind speed cannot be measured accurately, safety stop control such as stopping operation due to high wind speed (for example, cutout control that stops the operation of the wind power generation equipment 1 when the wind speed exceeds the cutout wind speed) cannot be performed, and there is a concern that the machine may break down or safety functions may be deteriorated.

For this reason, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state J, it issues a notification to inform the user that the anemometer 7 is showing signs of a malfunction, and recommends maintenance of the anemometer 7. The notification recommending maintenance here may be, for example, a notification recommending planned replacement or planned repair of a part or repair of the anemometer 7 within a specified period (e.g., within one month, etc.). Furthermore, when the abnormality diagnosis unit 48 judges the state of the wind power generation equipment 1 to be state J, it may operate the wind power generation equipment 1 in the above-mentioned output optimization mode or normal operation mode based on the calculated wind speed.

The present disclosure is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications.
In some embodiments, the accuracy of each threshold value may be improved by performing supervised machine learning on the above-mentioned threshold values (Itth, Pth, Tth0, Tthh, Tthl) stored in the storage unit 50. In other words, the relationship between each value to be compared with the threshold value and whether or not the operation mode (normal operation mode, output suppression mode, output optimization mode, or calculated wind speed operation mode) needs to be changed may be input by a human being after an abnormality diagnosis by the abnormality diagnosis system 40, and the threshold values may be repeatedly corrected.

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

[1] An abnormality diagnosis system for a wind power generation facility according to at least one embodiment of the present disclosure (e.g., the abnormality diagnosis system 40 described above) includes:
a measurement data acquisition unit (e.g., the above-mentioned measurement data acquisition unit 42) configured to acquire a measured wind speed (e.g., the above-mentioned measured wind speed Vm) which is a measurement value of the wind speed of the wind power generation facility, a measured output (e.g., the above-mentioned measured output Pm) which is a measurement value of the generator output of the wind power generation facility, and a measured value of the blade pitch angle of the wind power generation facility (e.g., the above-mentioned measured value of the blade pitch angle θ);
a planned output acquisition unit (e.g., the above-mentioned planned output acquisition unit 44) configured to acquire a planned output (e.g., the above-mentioned planned output Pp), which is a planned value of a generator output of the wind power generation facility determined from a power curve (e.g., the above-mentioned power curve Cp) of the wind power generation facility and the measured wind speed acquired by the measurement data acquisition unit;
a calculated wind speed calculation unit (e.g., the above-mentioned calculated wind speed calculation unit 46) configured to calculate a calculated wind speed (e.g., the above-mentioned calculated wind speed Vc) that is a calculated value of the wind speed of the wind power generation facility based on the measurement output acquired by the measurement data acquisition unit and the measurement value of the blade pitch angle;
an abnormality diagnosis unit (e.g., the above-mentioned abnormality diagnosis unit 48) configured to perform an abnormality diagnosis of the wind power generation facility based on a comparison between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit, and a comparison between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit;
Equipped with.

In the abnormality diagnosis system for wind power generation equipment described in [1] above, abnormality diagnosis of the wind power generation equipment is performed not only based on a comparison between the measured wind speed and the calculated wind speed, but also based on a comparison between the measured output and the planned output, making it possible to diagnose abnormalities of the wind power generation equipment more specifically than in Patent Document 1, which performs abnormality diagnosis of the wind power generation equipment based only on a comparison between the measured output and the planned output. For example, when the difference between the measured output and the planned output is sufficiently small, it is considered that an appropriate generator output according to the wind speed is obtained, so even if the difference between the measured wind speed and the calculated wind speed is relatively large, it is considered that no abnormality that would hinder the safe continuation of operation of the wind power generation equipment has occurred, and it is possible to continue operation of the wind power generation equipment. Therefore, it is possible to suppress a decrease in the operating rate of the wind power generation equipment based on the diagnosis result of the abnormality diagnosis unit.

[2] In some embodiments, in the abnormality diagnosis system for a wind power generation facility described in [1] above,
The abnormality diagnosis unit is configured to determine that there is no abnormality in the wind power generation equipment when the absolute value of the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than a threshold value.

According to the abnormality diagnosis system for wind power generation equipment described in [2] above, if the absolute value of the difference between the measured output and the planned output is smaller than the threshold value, it is considered that an appropriate generator output according to the wind speed is obtained, so even if the difference between the measured wind speed and the calculated wind speed is relatively large, it is possible to determine that there is no abnormality in the wind power generation equipment and continue operating the wind power generation equipment. Therefore, it is possible to suppress a decrease in the operating rate of the wind power generation equipment based on the diagnosis results of the abnormality diagnosis unit.

[3] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to the above [1] or [2],
The measurement data acquisition unit is configured to acquire a measurement value of an air temperature (e.g., the above-mentioned air temperature T),
the abnormality diagnosis unit is configured to operate the wind power generation facility in a normal operation mode when an absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP described above) is smaller than a first threshold value (e.g., the threshold value Pth described above);
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is suppressed more than in the normal operation mode when all of the following conditions (a), (b), and (c) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (for example, the absolute value of the difference ΔP described above) is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(c) The measured value of the air temperature acquired by the measurement data acquisition unit is lower than a third threshold value (e.g., the above-mentioned threshold value Tthl), and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the above-mentioned difference ΔP) is greater than 0.

In the above wind power generation equipment, when condition (a) is satisfied, it means that the measured output is in a state deviating from the normal range based on the planned output (the absolute value of the difference between the measured output and the planned output is not smaller than the first threshold). In addition, when conditions (b) and (c) are satisfied, although no failure or the like that would cause an impediment to the continued operation of the wind power generation equipment has occurred, it is considered that a state has occurred in which the measured output deviates from the planned output due to the temperature being lower than the third threshold and the air density being higher than normal. For this reason, as described in [3] above, when all of conditions (a), (b), and (c) are satisfied, the wind power generation equipment is operated in an operation mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment, thereby suppressing the occurrence of damage caused by fatigue loads and suppressing a decrease in the operating rate of the wind power generation equipment. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment can be suppressed, and public safety can be ensured.

[4] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [3] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature (e.g., the above-mentioned air temperature T),
the abnormality diagnosis unit operates the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit (e.g., the absolute value of the difference ΔP described above) is smaller than a first threshold value (e.g., the threshold value ΔPth described above);
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is increased by changing the blade pitch angle compared to the normal operation mode when all of the following conditions (a), (b), and (d) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (for example, the absolute value of the difference ΔP described above) is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is smaller than a second threshold value (e.g., the above-mentioned difference ΔVth).
(d) The measured value of the air temperature acquired by the measurement data acquisition unit is higher than a fourth threshold value (e.g., the above-mentioned threshold value ΔTthh), and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the above-mentioned difference ΔP) is smaller than 0.

In the above wind power generation equipment, when condition (a) is satisfied, it means that the measured output is out of the normal range based on the planned output (the absolute value of the difference between the measured output and the planned output is not smaller than the first threshold). When conditions (b) and (d) are satisfied, it is considered that although no failure or the like that would cause an impediment to the continued operation of the wind power generation equipment has occurred, the measured output deviates from the planned output due to the temperature being equal to or higher than the fourth threshold and the air density being lower than normal. For this reason, as described in [4] above, when all of conditions (a), (b), and (d) are satisfied, the wind power generation equipment is operated in an operation mode in which the generator output is made larger than in the normal operation mode by changing the blade pitch angle, thereby suppressing the decrease in generator output caused by high temperature and low air density while suppressing the decrease in the availability of the wind power generation equipment.

[5] In some embodiments, in the abnormality diagnosis system for a wind power generation facility described in [3] above,
The measurement data acquisition unit is configured to acquire a measurement value of an air temperature (e.g., the above-mentioned air temperature T),
the abnormality diagnosis unit operates the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit (e.g., the absolute value of the above-mentioned ΔP) is smaller than a first threshold value (e.g., the above-mentioned ΔPth);
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is increased by changing the blade pitch angle compared to the normal operation mode when all of the following conditions (a), (b), and (d) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (for example, the absolute value of the above-mentioned ΔP) is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(d) the measured value of the air temperature acquired by the measurement data acquisition unit is higher than a fourth threshold value (e.g., the above-mentioned threshold value Tthh) that is higher than the third threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the above-mentioned difference ΔP) is smaller than 0.

In the above wind power generation equipment, when condition (a) is satisfied, it means that the measured output is out of the normal range based on the planned output (the absolute value of the difference between the measured output and the planned output is not smaller than the first threshold). When conditions (b) and (d) are satisfied, it is considered that although no failure or the like that would cause an impediment to the continued operation of the wind power generation equipment has occurred, the measured output deviates from the planned output due to the temperature being equal to or higher than the fourth threshold and the air density being lower than normal. For this reason, as described in [4] above, when all of conditions (a), (b), and (d) are satisfied, the wind power generation equipment is operated in an operation mode in which the generator output is made larger than in the normal operation mode by changing the blade pitch angle, thereby suppressing the decrease in generator output caused by high temperature and low air density while suppressing the decrease in the availability of the wind power generation equipment.

[6] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [5] above,
The abnormality diagnosis unit is configured to stop operation of the wind power generation facility and/or send a notification indicating a request to dispatch an inspector to the wind power generation facility when both of the following conditions (a) and (b) are met and neither of the conditions (c) and (d) are met:
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the above-mentioned difference ΔV) is smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(c) The measured value of the air temperature acquired by the measurement data acquisition unit is lower than a third threshold value (e.g., the above-mentioned threshold value Tthl), and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the above-mentioned difference ΔP) is greater than 0.
(d) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or greater than a fourth threshold value (e.g., the above-mentioned threshold value Tthh), and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the above-mentioned difference ΔP) is less than 0.

In the above wind power generation facility, when conditions (a) and (b) are satisfied, it means that the measured output deviates from the normal range based on the planned output, even though the difference between the measured wind speed and the calculated wind speed is relatively small. In addition, in this case, when neither conditions (c) nor (d) are satisfied, it is considered that the state in which conditions (a) and (b) are satisfied is not caused by the temperature deviating from the normal range (the range between the third threshold and the fourth threshold). Therefore, when both conditions (a) and (b) are satisfied and neither conditions (c) and (d) are satisfied, it is considered that some unknown event that prevents the proper operation of the wind power generation facility is occurring, and therefore, as described in [6] above, the operation of the wind power generation facility is stopped and/or a notification requesting the dispatch of an inspector to the wind power generation facility is sent, thereby suppressing damage to the wind power generation facility and/or conducting a detailed inspection of the wind power generation facility.

[7] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [6] above,
The measurement data acquisition unit is configured to acquire a measurement value of an air temperature (e.g., the above-mentioned air temperature T),
the abnormality diagnosis unit is configured to operate the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit (e.g., the absolute value of the above-mentioned difference ΔP) is smaller than a first threshold value (e.g., the above-mentioned threshold value ΔPth);
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment more than in the normal operation mode when all of the following conditions (a), (e), (f), and (g) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (for example, the absolute value of the difference ΔP described above) is not smaller than the first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(f) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(g) The strength of turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit (e.g., the above-mentioned turbulence strength It) is equal to or greater than a fifth threshold (e.g., the above-mentioned threshold Itth).

In the above wind power generation facility, if all of conditions (a), (e), (f), and (g) are met, it is considered that the measured output is in excess of the planned output due to the strength of the wind speed turbulence (over-performance). For this reason, as described in [7] above, by operating the wind power generation facility in an operation mode that suppresses the wind load acting on the wind turbine blades of the wind power generation facility more than in the normal operation mode when all of conditions (a), (e), (f), and (g) are met, it is possible to suppress the occurrence of damage caused by fatigue loads while suppressing a decrease in the operating rate of the wind power generation facility. In addition, it is possible to suppress the occurrence of serious accidents caused by damage to the wind power generation facility, thereby ensuring public safety.

[8] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [7] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature (e.g., the above-mentioned air temperature T),
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operating mode in which the blade pitch angle is adjusted based on the calculated wind speed when all of the following conditions (a), (e), (f), (h), and (i) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(f) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit (e.g., the above-mentioned turbulence strength It) is not greater than a fifth threshold (e.g., the above-mentioned threshold Itth).
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than a temperature indicating the freezing point of water (for example, the above-mentioned threshold value Tth0).

In the above wind power generation equipment, if all of the conditions (a), (e), (f), (h), and (i) are satisfied, it means that the anemometer is in an icy state (including a state in which the anemometer is icy due to snowfall). If the operation of the wind power generation equipment is continued based on the measurement value of the anemometer in a state in which the anemometer is icy and cannot measure the wind speed accurately, safety stop control such as stopping operation due to high wind speed (for example, cut-out control that stops the operation of the wind power generation equipment when the wind speed exceeds the cut-out wind speed) cannot be performed, so there is a concern that the machine may break down or the safety function may be deteriorated. For this reason, as described in [8] above, if all of the conditions (a), (e), (f), (h), and (i) are satisfied, the wind power generation equipment may be operated in an operation mode that adjusts the blade pitch angle based on the calculated wind speed, thereby suppressing damage to the wind power generation equipment and suppressing a decrease in the availability rate of the wind power generation equipment. In addition, the occurrence of serious accidents due to damage to the wind power generation equipment, etc., may be suppressed, and public safety may be ensured.

[9] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [8] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
The abnormality diagnosis unit is configured to send a notification recommending maintenance of the anemometer and thermometer of the wind power generation equipment when all of the following conditions (a), (e), (f), (h), and (j) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(f) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit (e.g., the turbulence strength It mentioned above) is not greater than a fifth threshold (e.g., the threshold Itth mentioned above).
(j) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than a temperature indicating the freezing point of water.

In the above wind power generation equipment, if all of the conditions (a), (e), (f), (h), and (j) are met, it means that the anemometer or thermometer shows signs of failure. In this case, if the operation of the wind power generation equipment 1 is continued in a state where the wind speed cannot be measured accurately, safety stop control such as stopping operation due to high wind speed (for example, cut-out control that stops the operation of the wind power generation equipment when the wind speed exceeds the cut-out wind speed) cannot be performed, so there is a concern that the machine may break down or the safety function may be deteriorated. For this reason, as described in [9] above, if all of the conditions (a), (e), (f), (h), and (j) are met, a notification is sent to recommend maintenance of the anemometer and thermometer of the wind power generation equipment, thereby suppressing damage to the wind power generation equipment and suppressing a decrease in the operating rate of the wind power generation equipment. In addition, the occurrence of serious accidents due to damage to the wind power generation equipment, etc. can be suppressed, and public safety can be ensured. In addition, the workload of workers can be reduced by avoiding unexpected construction work.

[10] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [9] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
The abnormality diagnosis unit is configured to stop operation of the wind power generation facility when all of the following conditions (a), (e), (k), (i), (l), and (m) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than a temperature indicating the freezing point of water (for example, the above-mentioned Tth0).
(l) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the absolute value of the wind direction deviation (for example, the above-mentioned wind direction deviation Δα) exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.

In the above wind power generation equipment, if all of the conditions (a), (e), (k), (i), (l), and (m) are met, it means that the anemometer is in a state of ice. In this case, if the wind power generation equipment continues to operate while the wind direction cannot be measured accurately, it will not be possible to operate the wind turbine rotor facing the wind direction (operation with the wind direction deviation at 0 or close to 0), and there is a concern that the machine may break down or safety functions may be deteriorated. For this reason, as described in [10] above, if all of the conditions (a), (e), (k), (i), (l), and (m) are met, damage to the wind power generation equipment can be suppressed by stopping the operation of the wind power generation equipment. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment, etc. can be suppressed, and public safety can be ensured.

[11] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [10] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
The abnormality diagnosis unit is configured to send a notification to inform the user that the wind vane of the wind power generation equipment is in an iced state when all of the following conditions (a), (e), (k), (i), (l), and (m) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than a temperature indicating the freezing point of water (for example, the above-mentioned temperature ΔTth0).
(l) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the absolute value of the wind direction deviation (for example, the above-mentioned wind direction deviation Δα) exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.

In the above wind power generation facility, if all of conditions (a), (e), (k), (i), (l), and (m) are satisfied, it means that the anemometer is in an icy state. In this case, as described in [11] above, by sending a notification to inform the wind power generation facility that the anemometer is in an icy state, it is possible to know that the anemometer is in an icy state and take appropriate measures.

[12] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [11] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
The abnormality diagnosis unit is configured to send a notification recommending maintenance of the wind vane of the wind power generation equipment when all of the following conditions (a), (e), (k), (l), (m), and (n) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the absolute value of the wind direction deviation (for example, the above-mentioned wind direction deviation Δα) exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.
(n) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than the temperature indicating the freezing point of water.

In the above wind power generation equipment, if all of the conditions (a), (e), (k), (l), (m) and (n) are met, the wind vane is showing signs of failure, and if operation of the wind power generation equipment 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, the wind turbine rotor will not be able to be operated facing the wind direction, and there is a concern that the machine will break down and safety functions will be reduced. For this reason, if all of the conditions (a), (e), (k), (l), (m) and (n) are met as described in [12] above, a notification recommending maintenance of the wind vane of the wind power generation equipment can be sent, and the wind vane can be replaced to prevent damage to the wind power generation equipment. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment can be prevented, and public safety can be ensured.

[13] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [12] above,
The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
The abnormality diagnosis unit is configured to stop operation of the wind power generation facility when all of the following conditions (a), (e), (k), (l), (m), and (n) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the absolute value of the wind direction deviation (for example, the above-mentioned wind direction deviation Δα) exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.
(n) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than a temperature indicating the freezing point of water (for example, the above-mentioned threshold value Tth0).

In the above wind power generation equipment, if all of the conditions (a), (e), (k), (l), (m) and (n) are met, the wind vane is showing signs of failure, and if operation of the wind power generation equipment is continued, the wind direction deviation signal will not be stable, causing the nacelle to continue yaw rotation, which may lead to a malfunction of the equipment for controlling the nacelle yaw rotation. In addition, the wind turbine rotor will not be able to be operated facing the wind direction, which may lead to mechanical failure and a deterioration in safety functions. For this reason, as described in [13] above, if all of the conditions (a), (e), (k), (l), (m) and (n) are met, the operation of the wind power generation equipment can be stopped to prevent damage to the wind power generation equipment. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment, etc. can be prevented, and public safety can be ensured.

[14] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [13] above,
The abnormality diagnosis unit is configured to send a notification recommending maintenance of the wind vane of the wind power generation equipment when all of the following conditions (a), (e), (k), (l) and (o) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the absolute value of the wind direction deviation (for example, the above-mentioned wind direction deviation Δα) exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) for a predetermined period of time or more.
(o) The wind direction deviation changes within a predetermined time period.

In the above wind power generation facility, if all of the conditions (a), (e), (k), (l), and (o) are met, the anemometer is in a deteriorated state, and although the operation of the wind power generation facility can continue, it is desirable to replace the anemometer. Therefore, as described in [14] above, if all of the conditions (a), (e), (k), (l), and (o) are met, a notification recommending maintenance of the anemometer is sent, so that it is possible to know that the anemometer is deteriorated and take appropriate measures.

[15] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [14] above,
The abnormality diagnosis unit is configured to issue a notification recommending replacement of a worn portion of a blade pitch mechanism of the wind power generation facility (e.g., the above-mentioned blade pitch mechanism 12) when all of the following conditions (a), (e), (k), (p), and (q) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) does not continue for a predetermined period of time or more.
(q) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is greater than the threshold value defined for each wind speed range.

In the above wind power generation equipment, if all of the conditions (a), (e), (k), (p), and (q) are met, it means that the blade pitch mechanism is worn and deteriorated, and the output performance is reduced because the pitch angle cannot be controlled to the optimal pitch angle according to the wind speed. If the deterioration of the blade pitch mechanism is left unattended, there is a concern that the degree of damage to the equipment will progress and the damage will become severe. For this reason, as described in [15] above, if all of the conditions (a), (e), (k), (p), and (q) are met, a notification is sent to recommend replacing the worn parts of the blade pitch mechanism, so that the blade pitch mechanism can be replaced and damage to the wind power generation equipment can be suppressed. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment can be suppressed, and public safety can be ensured.

[16] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [15] above,
the abnormality diagnosis unit operates the wind power generation facility in a normal operation mode when an absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP described above) is smaller than a first threshold value (e.g., the threshold value ΔPth described above);
The abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is increased more than in the normal operation mode and the wind load acting on the wind turbine blades of the wind power generation equipment is suppressed more than in the normal operation mode when all of the following conditions (a), (e), (g), (k), (p), and (r) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (for example, the absolute value of the difference ΔP described above) is not smaller than the first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(g) The strength of turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit (e.g., the above-mentioned turbulence strength It) is equal to or greater than a fifth threshold (e.g., the above-mentioned threshold Itth).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) does not continue for a predetermined period of time or more.
(r) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is not greater than the threshold value defined for each wind speed range.

In the above wind power generation equipment, if all of the conditions (a), (e), (g), (k), (p), and (r) are satisfied, it means that the measured output is less than the planned output due to the strength of the wind speed turbulence (performance degradation). Therefore, as described in [16] above, if all of the conditions (a), (e), (g), (k), (p), and (r) are satisfied, the wind power generation equipment is operated in an operation mode that suppresses the wind load acting on the wind turbine blades of the wind power generation equipment more than in the normal operation mode, thereby suppressing the occurrence of damage caused by fatigue loads and suppressing a decrease in the operating rate of the wind power generation equipment. In addition, the occurrence of serious accidents caused by damage to the wind power generation equipment can be suppressed, and public safety can be ensured.

[17] In some embodiments, in the abnormality diagnosis system for a wind power generation facility according to any one of [1] to [16] above,
The abnormality diagnosis unit is configured to send a notification recommending maintenance of the anemometer of the wind power generation equipment when all of the following conditions (a), (e), (h), (k), (p), and (r) are satisfied.
(a) The absolute value of the difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit (e.g., the absolute value of the difference ΔP mentioned above) is not smaller than a first threshold value (e.g., the threshold value ΔPth mentioned above).
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit (e.g., the absolute value of the above-mentioned difference ΔV) is not smaller than a second threshold value (e.g., the above-mentioned threshold value ΔVth).
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit (e.g., the turbulence strength It mentioned above) is not greater than a fifth threshold (e.g., the threshold Itth mentioned above).
(k) A difference (for example, the above-mentioned difference ΔP) between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative 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 above-mentioned wind direction deviation Δα), the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value (for example, the above-mentioned threshold value αth) does not continue for a predetermined period of time or more.
(r) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is not greater than the threshold value defined for each wind speed range.

In the above wind power generation facility, if all of the conditions (a), (e), (h), (k), (p), and (r) are met, it means that the measured output is in excess of the planned output due to the strength of the wind speed disturbance (overperformance). Therefore, as described in [17] above, if all of the conditions (a), (e), (h), (k), (p), and (r) are met, a notification is sent to recommend maintenance of the anemometer and thermometer of the wind power generation facility, thereby suppressing damage to the wind power generation facility and suppressing a decrease in the operating rate of the wind power generation facility. In addition, it is possible to suppress the occurrence of serious accidents caused by damage to the wind power generation facility, etc., and ensure the safety of the public. In addition, it is possible to reduce the workload of workers by avoiding unexpected construction work.

[18] A method for diagnosing an abnormality in a wind power generation facility according to at least one embodiment of the present disclosure,
a data acquisition step of acquiring a measured wind speed (e.g., the measured wind speed Vm described above) which is a measured value of the wind speed of the wind power generation facility, a measured output (e.g., the measured output Pm described above) which is a measured value of the generator output of the wind power generation facility, and a measured value of the blade pitch angle of the wind power generation facility (e.g., the measured value of the blade pitch angle θ described above);
a planned output acquisition step of acquiring a planned output (e.g., the above-mentioned planned output Pp) which is a planned value of a generator output of the wind power generation facility determined from a power curve of the wind power generation facility and the measured wind speed acquired in the data acquisition step;
a calculated wind speed calculation step of calculating a calculated wind speed (e.g., the above-mentioned calculated wind speed Vc) which is a calculated value of the wind speed of the wind power generation facility based on the measurement output and the measurement value of the blade pitch angle acquired in the data acquisition step;
an abnormality diagnosis step of diagnosing an abnormality of the wind power generation facility based on a comparison between the measured output acquired in the data acquisition step and the planned output acquired in the planned output acquisition step, and a comparison between the measured wind speed acquired in the data acquisition step and the calculated wind speed calculated in the calculated wind speed calculation step;
Equipped with.

In the method for diagnosing abnormalities in wind power generation equipment described in [18] above, by diagnosing abnormalities in the wind power generation equipment based not only on a comparison between the measured wind speed and the calculated wind speed but also on a comparison between the measured output and the planned output, it is possible to diagnose abnormalities in the wind power generation equipment more specifically than in Patent Document 1, which diagnoses abnormalities in the wind power generation equipment based only on a comparison between the measured output and the planned output. For example, when the difference between the measured output and the planned output is sufficiently small, it is considered that an appropriate generator output according to the wind speed is obtained, so even if the difference between the measured wind speed and the calculated wind speed is relatively large, it is considered that no abnormality that would hinder the safe continuation of operation of the wind power generation equipment has occurred, and it is possible to continue operation of the wind power generation equipment. Therefore, it is possible to suppress a decrease in the operating rate of the wind power generation equipment based on the diagnosis result of the abnormality diagnosis unit.

REFERENCE SIGNS LIST 1 Wind power generation equipment 2 Support 3 Nacelle 4 Wind turbine rotor 5 Rotor head 6 Wind turbine blade 7 Anemometer 8 Wind vane 9 Temperature gauge 10 Gearbox 11 Generator 12 Blade pitch mechanism 14 Rotation mechanism 15 Pitch angle sensor 16 Generator output meter 18 Yaw angle sensor 20 Control device 21 Communication network 40 Abnormality diagnosis system 42 Measurement data acquisition unit 44 Planned output acquisition unit 46 Calculated wind speed calculation unit 48 Abnormality diagnosis unit 50 Memory unit 72 Processor 74 RAM
76 ROM
78 HDD
80 Input I/F
82 Output I/F
83 Display 84 Bus

Claims (18)

a measurement data acquisition unit configured to acquire a measured wind speed, which is a measured value of a wind speed of a wind power generation facility, a measured output, which is a measured value of a generator output of the wind power generation facility, and a measured value of a blade pitch angle of the wind power generation facility;
a planned output acquisition unit configured to acquire a planned output, which is a planned value of a generator output of the wind power generation facility corresponding to the measured wind speed acquired by the measurement data acquisition unit, by referring to a power curve of the wind power generation facility;
a calculated wind speed calculation unit configured to calculate a calculated wind speed, which is a calculated value of the wind speed of the wind power generation facility, based on the measurement output acquired by the measurement data acquisition unit and the measurement value of the blade pitch angle;
an abnormality diagnosis unit configured to perform an abnormality diagnosis of the wind power generation facility based on a comparison between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit, and a comparison between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit;
An abnormality diagnosis system for wind power generation equipment. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to determine that there is no abnormality in the wind power generation equipment when the absolute value of the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than a threshold value. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
the abnormality diagnosis unit is configured to operate the wind power generation facility in a normal operation mode when an absolute value of a difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than a first threshold value;
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is suppressed more than in the normal operation mode when all of the following conditions (a), (b), and (c) are satisfied:
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is smaller than a second threshold value.
(c) The measured value of the air temperature acquired by the measurement data acquisition unit is lower than a third threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
the abnormality diagnosis unit operates the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit is smaller than a first threshold value;
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is made larger than that in the normal operation mode by changing the blade pitch angle when all of the following conditions (a), (b), and (d) are satisfied:
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is smaller than a second threshold value.
(d) The measured value of the air temperature acquired by the measurement data acquisition unit is higher than a fourth threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is less than 0. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
the abnormality diagnosis unit is configured to operate the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit is smaller than a first threshold value;
4. The abnormality diagnosis system for wind power generation equipment according to claim 3, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is made larger than that in the normal operation mode by changing the blade pitch angle when all of the following conditions (a), (b), and (d) are satisfied:
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than the first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is smaller than a second threshold value.
(d) the measured value of the air temperature acquired by the measurement data acquisition unit is higher than a fourth threshold value which is higher than the third threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is less than 0. The abnormality diagnosis system for wind power generation equipment according to any one of claims 1 to 5, wherein the abnormality diagnosis unit is configured to stop operation of the wind power generation equipment and/or issue a notification indicating a request to dispatch an inspector to the wind power generation equipment when both of the following conditions (a) and (b) are met and neither of the following conditions (c) and (d) are met.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(b) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is smaller than a second threshold value.
(c) The measured value of the air temperature acquired by the measurement data acquisition unit is lower than a third threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(d) the measured value of the air temperature acquired by the measurement data acquisition unit is greater than or equal to a fourth threshold value, and the difference between the measured output acquired by the measurement data acquisition unit and the planned output acquired by the planned output acquisition unit is less than zero. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
the abnormality diagnosis unit is configured to operate the wind power generation facility in a normal operation mode when an absolute value of a difference between the planned output acquired by the planned output acquisition unit and the measured output acquired by the measured data acquisition unit is smaller than a first threshold value;
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode that suppresses wind load acting on wind turbine blades of the wind power generation equipment more than in the normal operation mode when all of the following conditions (a), (e), (f), and (g) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than the first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(f) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(g) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit is equal to or greater than a fifth threshold value. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the blade pitch angle is adjusted based on the calculated wind speed when all of the following conditions (a), (e), (f), (h), and (i) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(f) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit is not equal to or greater than a fifth threshold value.
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than the temperature indicating the freezing point of water. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification recommending maintenance of an anemometer and a thermometer of the wind power generation equipment when all of the following conditions (a), (e), (f), (h), and (j) are satisfied:
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(f) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is greater than zero.
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit is not equal to or greater than a fifth threshold value.
(j) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than a temperature indicating the freezing point of water. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to stop operation of the wind power generation equipment when all of the following conditions (a), (e), (k), (i), (l) and (m) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than the temperature indicating the freezing point of water.
(l) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, the absolute value of the wind direction deviation exceeds the sixth threshold value for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification to notify that an anemometer of the wind power generation equipment is in an icy state when all of the following conditions (a), (e), (k), (i), (l), and (m) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(i) The measured value of the air temperature acquired by the measurement data acquisition unit is equal to or lower than the temperature indicating the freezing point of water.
(l) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, the absolute value of the wind direction deviation exceeds the sixth threshold value for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification recommending maintenance of a wind vane of the wind power generation equipment when all of the following conditions (a), (e), (k), (l), (m), and (n) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, the absolute value of the wind direction deviation exceeds the sixth threshold value for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.
(n) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than the temperature indicating the freezing point of water. The measurement data acquisition unit is configured to acquire a measurement value of air temperature,
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to stop operation of the wind power generation equipment when all of the following conditions (a), (e), (k), (l), (m), and (n) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, the absolute value of the wind direction deviation exceeds the sixth threshold value for a predetermined period of time or more.
(m) The wind direction deviation does not change for a predetermined period of time or more.
(n) The measured value of the air temperature acquired by the measurement data acquisition unit is not equal to or lower than the temperature indicating the freezing point of water. 2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification recommending maintenance of a wind vane of the wind power generation equipment when all of the following conditions (a), (e), (k), (l) and (o) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(l) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as the wind direction deviation, the absolute value of the wind direction deviation exceeds the sixth threshold value for a predetermined period of time or more.
(o) The wind direction deviation changes within a predetermined time period. 2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification recommending replacement of a worn portion of a blade pitch mechanism of the wind power generation equipment when all of the following conditions (a), (e), (k), (p), and (q) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as wind direction deviation, the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value does not continue for a predetermined period of time or more.
(q) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is greater than the threshold value defined for each wind speed range. the abnormality diagnosis unit operates the wind power generation facility in a normal operation mode when an absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than a first threshold value;
2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to operate the wind power generation equipment in an operation mode in which the generator output is increased more than in the normal operation mode and the wind load acting on the wind turbine blades of the wind power generation equipment is suppressed more than in the normal operation mode when all of the following conditions (a), (e), (g), (k), (p), and (r) are satisfied.
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than the first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(g) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit is equal to or greater than a fifth threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as wind direction deviation, the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value does not continue for a predetermined period of time or more.
(r) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is not greater than the threshold value defined for each wind speed range. 2. The abnormality diagnosis system for wind power generation equipment according to claim 1, wherein the abnormality diagnosis unit is configured to issue a notification recommending maintenance of an anemometer of the wind power generation equipment when all of the following conditions (a), (e), (h), (k), (p), and (r) are satisfied:
(a) An absolute value of a difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is not smaller than a first threshold value.
(e) The absolute value of the difference between the measured wind speed acquired by the measurement data acquisition unit and the calculated wind speed calculated by the calculated wind speed calculation unit is not smaller than a second threshold value.
(h) The strength of the turbulence in the wind speed calculated based on the measured wind speed acquired by the measurement data acquisition unit is not equal to or greater than a fifth threshold value.
(k) A difference between the measured output acquired by the measured data acquisition unit and the planned output acquired by the planned output acquisition unit is smaller than zero.
(p) If the angle of the wind direction measured by a wind vane relative to the rotation axis of the wind turbine rotor in the wind power generation facility is defined as wind direction deviation, the state in which the absolute value of the wind direction deviation exceeds a sixth threshold value does not continue for a predetermined period of time or more.
(r) The peak-to-peak value of the generator output in the time-series data of the generator output classified by wind speed range is not greater than the threshold value defined for each wind speed range. a data acquisition step of acquiring a measured wind speed, which is a measured value of a wind speed of a wind power generation facility, a measured output, which is a measured value of a generator output of the wind power generation facility, and a measured value of a blade pitch angle of the wind power generation facility;
a planned output acquisition step of acquiring a planned output, which is a planned value of a generator output of the wind power generation facility determined from a power curve of the wind power generation facility and the measured wind speed acquired in the data acquisition step;
a calculated wind speed calculation step of calculating a calculated wind speed, which is a calculated value of the wind speed of the wind power generation facility, based on the measurement output acquired in the data acquisition step and the measurement value of the blade pitch angle;
an abnormality diagnosis step of diagnosing an abnormality of the wind power generation facility based on a comparison between the measured output acquired in the data acquisition step and the planned output acquired in the planned output acquisition step, and a comparison between the measured wind speed acquired in the data acquisition step and the calculated wind speed calculated in the calculated wind speed calculation step;
The method for diagnosing an abnormality in a wind power generation facility includes:

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