JP2024077839A - Abnormality diagnosis system and abnormality diagnosis method for wind power generation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality diagnosis system and an abnormality diagnosis method for a wind power generation facility, which can early detect an abnormality in a nacelle brake mechanism.

SOLUTION: An abnormality diagnosis system performs abnormality diagnosis on a wind power generation facility that includes a nacelle, a nacelle brake mechanism for braking rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle. The abnormality diagnosis system comprises: a sliding determination unit for determining whether a nacelle sliding amount, which is the amount of rotation of the nacelle while the nacelle brake mechanism is operating, exceeds an allowable sliding amount on the basis of the yaw angle measured by the yaw angle sensor; a wind state determination unit for determining whether a wind state at the wind power generation facility satisfies a specified steady wind state condition; and a nacelle brake abnormality diagnosis unit for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind state condition is satisfied and the nacelle sliding amount exceeds the allowable sliding amount.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2024,JPO&INPIT

Description

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

The wind power generation equipment disclosed in Patent Document 1 includes a nacelle, a nacelle rotation mechanism for yaw rotating the nacelle, a yaw drive mechanism for driving the nacelle rotation mechanism, and a yaw brake for stopping the yaw rotation of the nacelle.

JP 2015-161172 A

It is preferable to be able to detect abnormalities in nacelle brake mechanisms, such as yaw brakes, at an early stage. However, the above-mentioned Patent Document 1 does not disclose a specific configuration.

The objective of this disclosure is to provide an abnormality diagnosis system and an abnormality diagnosis method for wind power generation equipment that can detect abnormalities in the nacelle brake mechanism at an early stage.

An abnormality diagnosis system for a wind power generation facility according to at least one embodiment of the present disclosure includes:
An abnormality diagnosis system for a wind power generation facility for performing abnormality diagnosis on the wind power generation facility including a nacelle, a nacelle brake mechanism for braking the rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle,
a slippage determination unit for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount based on the yaw angle measured by the yaw angle sensor;
a wind condition determination unit for determining whether wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis unit for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount; and
Equipped with.

A method for diagnosing an abnormality in a wind power generation facility according to at least one embodiment of the present disclosure includes:
An abnormality diagnosis method for a wind power generation facility for performing abnormality diagnosis on a wind power generation facility including a nacelle, a nacelle brake mechanism for braking the rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle, comprising:
a slippage determination step for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount, based on the yaw angle measured by the yaw angle sensor;
a wind condition determination step for determining whether the wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis step for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount;
Equipped with.

This disclosure provides an abnormality diagnosis system and an abnormality diagnosis method for wind power generation equipment that can detect abnormalities in the nacelle brake mechanism at an early stage.

1 is a schematic diagram illustrating an abnormality diagnosis system and a wind power generation facility according to an embodiment. 1 is a schematic plan view of a wind power generation facility in which wind direction tracking control according to an embodiment is performed; 1 is a schematic graph showing time series data of the absolute value of wind direction deviation according to one embodiment. 1 is a schematic diagram illustrating a hardware configuration of an abnormality diagnosis system according to an embodiment. 1 is a schematic block diagram showing a basic functional configuration of an abnormality diagnosis system according to an embodiment. FIG. 11 is a schematic diagram showing details of steady wind conditions according to an embodiment. FIG. 2 is a schematic block diagram of an abnormality diagnosis system having an additional functional configuration according to an embodiment. 11 is a schematic graph showing time series data of output deviation. 1 is a schematic graph illustrating time series data of a yaw angle according to an embodiment. 5 is a flowchart illustrating an abnormality diagnosis process according to an embodiment. 11 is a flowchart illustrating the abnormality diagnosis process, continuing from FIG. 10 .

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.

<1. Overview of the abnormality diagnosis system 40 and the wind power generation facility 1>
Fig. 1 is a schematic diagram showing an abnormality diagnosis system 40 according to an embodiment of the present disclosure and a wind power generation facility 1. The abnormality diagnosis in this paper includes determining whether or not there is an abnormality in the wind power generation facility 1. As shown in Fig. 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.

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 also includes a pitch mechanism 12 for adjusting the pitch angle of each of the wind turbine blades 6, a yaw rotation mechanism 14 for adjusting the yaw angle of the nacelle 3, and a nacelle brake mechanism 30 for braking the rotation of the nacelle 3. The yaw rotation mechanism 14 in this example includes a yaw motor 16 connected to the nacelle 3 and a pinion gear fixed to the output shaft of the yaw motor 16, and the pinion gear meshes with a ring gear fixed to the support 2. When the yaw motor 16 is driven, the pinion gear rolls along the teeth of the ring gear, and the nacelle 3 rotates in the yaw direction. The nacelle brake mechanism 30 includes a hydraulic actuator 32, a brake pad 34 attached to the hydraulic actuator 32, and a disk brake (not shown) connected to the nacelle 3. When the hydraulic actuator 32 is activated in response to the activation of the nacelle brake mechanism 30, the brake pad 34 is pressed against the disk brake, and a braking force acts on the nacelle 3.

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 pitch angle, and a yaw angle sensor 18 that measures the yaw angle 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 wind speed by measuring the rotation speed of a cup rotating around a rotating shaft with a rotary encoder or the like, and the windmill-type anemometer measures the wind speed by measuring the rotation speed of a propeller-shaped blade rotating around a rotating shaft with a rotary encoder or the like. The wind vane 8 may be, for example, a potentiometer-type wind vane that converts the change in the direction of the arrow blade rotating around the rotation axis into a change in electrical resistance, and measures the angle of the wind flow direction with respect to a predetermined reference direction (for example, northward) 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. The yaw angle sensor 18 may be an encoder that outputs an electrical signal according to the drive of the yaw motor 16. The yaw angle sensor 18 includes a main body that is connected to the nacelle 3, a support shaft that is rotatably supported by the main body, and a sensor gear provided on the support shaft. The sensor gear is engaged with the above-mentioned ring gear, and when the nacelle 3 rotates by the drive of the yaw motor 16, the sensor gear rolls along the teeth of the ring gear. The yaw angle sensor 18 detects the amount of rotation of the support shaft to detect the yaw angle.

A control device 20 is provided in an appropriate location of the wind power generation facility 1 (e.g., inside the nacelle 3 or inside the support 2, etc.) to perform various operational controls of the wind power generation facility 1. Signals indicating the wind speed measured by the anemometer 7, the wind direction measured by the wind vane 8, the temperature measured by the temperature gauge 9, the pitch angle measured by the pitch angle sensor 15, and the yaw angle of the nacelle 3 measured by the yaw angle sensor 18 are input to the control device 20. The control device 20 is at least one controller.

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, such as the wind speed measured by the anemometer 7, the wind direction measured by the wind vane 8, the temperature measured by the thermometer 9, the pitch angle measured by the pitch angle sensor 15, and the yaw angle measured by the yaw angle sensor 18, to the abnormality diagnosis system 40. 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 schematic plan view of a wind power generation facility 1 in which wind direction tracking control according to an embodiment of the present disclosure is performed. Wind direction tracking control is a control for changing the orientation of the nacelle 3 to follow the wind direction so that the nacelle 3 faces the wind direction directly, and is executed by a control device 20. Figure 3 is a schematic graph showing time series data of the absolute value of wind direction deviation according to an embodiment of the present disclosure. The wind direction deviation 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 from the wind direction. The angle θ in Figure 2 indicates the wind direction deviation.

The control device 20 calculates the absolute value of the wind direction deviation based on the wind direction measured by the anemometer 8 and the yaw angle measured by the yaw angle sensor 18. Next, it is determined whether an event has occurred in which the absolute value of the wind direction deviation exceeds the wind direction tracking threshold. In the period from time t1 to time t2 in FIG. 3, the absolute value of the wind direction deviation exceeds the wind direction tracking threshold. If it is expected that the event in which the absolute value of the wind direction deviation exceeds the wind direction threshold will continue for more than the allowable deviation time, the control device 20 controls the yaw motor 16 to reduce the absolute value of the wind direction deviation (preferably to make it 0). The allowable deviation time is calculated from the point in time (t1 in FIG. 3) when the absolute value of the wind direction deviation exceeds the wind direction tracking threshold. In addition, the longer the allowable deviation time, the fewer the opportunities for the control device 20 to control the yaw motor 16, which leads to power consumption of the wind power generation facility 1. On the other hand, the longer the allowable deviation time, the lower the tracking ability of the rotation of the nacelle 3 to changes in wind direction.

The control device 20 is configured to input a brake activation command and a brake release command to the hydraulic actuator 32 of the nacelle brake mechanism 30. When a brake activation command is input, the hydraulic actuator 32 operates and a braking force acts on the nacelle 3. Thereafter, until a brake release command is input to the hydraulic actuator 32, the brake activation command input to the hydraulic actuator 32 remains valid and a braking force continues to act on the nacelle 3. When a brake release command is input to the hydraulic actuator 32, the brake activation command is invalidated and the hydraulic actuator 32 stops operating. As a result, the brake pads 34 are separated from the disc brake, and the braking force acting on the nacelle 3 disappears.

4 is a schematic diagram showing a hardware configuration of an abnormality diagnosis system 40 according to an embodiment of the present disclosure. The abnormality diagnosis system 40 includes, for example, a processor 72, a random access memory (RAM) 74, a read only memory (ROM) 76, a hard disk drive (HDD) 78, an input I/F 80, an output I/F 82, and a display 83, and is configured using a computer in which these are 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 realized 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 by the processor 72 loading a program stored in the ROM 76 into the RAM 74 and executing it. The processor 72 may temporarily store various data generated in association with the execution of the program in the RAM 74.
The hardware constituting the abnormality diagnosis system 40 may be concentrated in one location, or may be distributed across multiple locations. In the following, an example will be described in which the abnormality diagnosis system 40 is provided at a location away from the wind power generation facility 1 and abnormality diagnosis of the wind power generation facility 1 is performed remotely, but at least one of the functions constituting the abnormality diagnosis system 40 may be realized by, for example, the control device 20 provided in the wind power generation facility 1.

2. Basic Functional Configuration of Abnormality Diagnosis System 40
Fig. 5 is a schematic block diagram showing a basic functional configuration of an abnormality diagnosis system 40 according to an embodiment of the present disclosure. The functional configuration of the abnormality diagnosis system 40 shown in the block diagram of Fig. 5 is realized by the hardware configuration of the abnormality diagnosis system 40 exemplified in Fig. 4 (the same applies to the block diagram shown in Fig. 7).

As shown in FIG. 5, the abnormality diagnosis system 40 includes a nacelle time series data acquisition unit 41. The nacelle time series data acquisition unit 41 is configured to acquire nacelle time series data including time series data of the yaw angle of the nacelle 3 and time series data of the operating state of the nacelle brake mechanism 30 (hereinafter also referred to as "brake state time series data"). The yaw angle time series data is generated by continuously acquiring the yaw angle measured by the yaw angle sensor 18. The brake state time series data is generated by associating the command (i.e., brake activation command or brake release command) input from the control device 20 to the hydraulic actuator 32 with time. In this example, both the nacelle time series data and the brake state time series data are generated by the nacelle time series data acquisition unit 41. In another example, these time series data may be generated by the control device 20 and then sent to the abnormality diagnosis system 40.

The abnormality diagnosis system 40 further includes a sliding determination unit 42. The sliding determination unit 42 is configured to determine whether the nacelle sliding amount, which is the amount of rotation of the nacelle 3 while the nacelle brake mechanism 30 is operating, has exceeded the allowable sliding amount based on the nacelle time series data. The nacelle sliding amount can be acquired by referring to the time series data of the yaw angle while the brake operation command input to the nacelle brake mechanism 30 is valid. Specifically, the time period during which the brake operation command is valid is identified based on the brake state time series data, and the amount of change in the yaw angle during that time period is identified based on the time series data of the yaw angle. In this way, the nacelle sliding amount is acquired. The criterion for determining whether the nacelle sliding amount has exceeded the allowable sliding amount may be whether the nacelle sliding amount has exceeded the allowable sliding amount within a specified time, whether the cumulative value of the nacelle sliding amount has exceeded the allowable sliding amount instantaneously, or whether an event in which the cumulative value of the nacelle sliding amount exceeds the allowable sliding amount occurs multiple times over a specified period of time. An example of the detailed determination criterion will be described later.

The abnormality diagnosis system 40 includes a wind condition determination unit 43 for determining whether the wind conditions in the wind power generation facility 1 satisfy prescribed steady-state wind condition conditions. The steady-state wind conditions are wind conditions in the wind power generation facility 1 that are assumed in rated operation of the wind power generation facility 1. When the steady-state wind condition conditions that specify the steady-state wind conditions are satisfied, the wind speed is in the range from medium to high, and the wind speed turbulence or wind direction turbulence is medium or less.
The wind condition determination unit 43 determines whether the steady wind condition condition is satisfied by acquiring at least one measurement result of the anemometer 7 or the wind vane 8. The at least one measurement result of the anemometer 7 or the wind vane 8 is a parameter referenced in the determination by the wind condition determination unit 43.

The abnormality diagnosis system 40 further includes a nacelle brake abnormality diagnosis unit 45. The nacelle brake abnormality diagnosis unit 45 is configured to diagnose an abnormality in the nacelle brake mechanism 30 when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount exceeds the allowable sliding amount. The nacelle brake abnormality diagnosis unit 45 that has diagnosed an abnormality may generate a brake inspection display command for displaying information prompting inspection of the nacelle brake mechanism 30 on the display 83. When the display 83 to which the brake inspection display command has been input displays information prompting inspection, the user of the abnormality diagnosis system 40 can inspect the nacelle brake mechanism 30 early. The information prompting inspection may be a text message, an error code expressed by alphanumeric characters, or a mark expressed by a figure.

According to the knowledge of the inventors, when the steady wind condition, which is the wind condition assumed in the rated operation of the wind power generation facility 1, is satisfied, if the nacelle sliding amount exceeds the allowable sliding amount even though the nacelle brake mechanism 30 is operating, it is highly likely that some abnormality has occurred in the nacelle brake mechanism 30. Specifically, the braking force of the nacelle brake mechanism 30 may be reduced due to wear or deterioration of the brake pads 34, or due to excessive oil adhesion to the brake pads 34. The inventors have found that even if such an abnormality occurs at a minor level, the nacelle sliding amount exceeds the allowable sliding amount. In this regard, according to the above configuration, when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount, the nacelle brake abnormality diagnosis unit 45 diagnoses that there is an abnormality in the nacelle brake mechanism 30. Thus, an abnormality diagnosis system 40 that can detect an abnormality in the nacelle brake mechanism 30 at an early stage is realized.

<2. Criteria and details of steady wind conditions>
6 is a schematic diagram showing details of steady-state wind condition according to an embodiment of the present disclosure. The steady-state wind condition includes a first steady-state wind condition, a second steady-state wind condition, a third steady-state wind condition, and a fourth steady-state wind condition. In this example, if all of these four conditions are satisfied, the steady-state wind condition is determined to be satisfied, and if at least one of these four conditions is not satisfied, the steady-state wind condition is determined not to be satisfied.

The first steady wind condition is satisfied when the wind speed in the wind power generation facility 1 is equal to or greater than the first specified wind speed, which is the lower limit of the wind speed that specifies the steady wind condition. When wind with a first specified wind speed or greater acts on the wind turbine blades 6 of the wind power generation facility 1, a certain degree of rotational force acts on the nacelle 3. If the nacelle sliding amount exceeds the allowable sliding amount at this time, it is highly likely that an abnormality occurs in the nacelle brake mechanism 30 and the braking force of the nacelle brake mechanism 30 is not sufficient to brake the rotation of the nacelle 3. In this regard, according to the present configuration, in order to determine that there is an abnormality in the nacelle brake mechanism 30, the wind speed must be equal to or greater than the first specified wind speed, and the first steady wind condition must be satisfied. This allows for more accurate detection of an abnormality in the nacelle brake mechanism 30. As an example, the first specified wind speed may be an average wind speed of 20 m/s or less, or an average wind speed of 15 m/s or less. The first specified wind speed may also be an instantaneous wind speed.

The second steady wind condition is satisfied when the wind speed turbulence intensity in the wind power generation facility 1 is less than a specified intensity, which is the upper limit of the turbulence intensity that specifies the steady wind condition. The turbulence intensity is the ratio of the wind speed standard deviation to the average wind speed within a specified period, and is calculated based on the measurement results of the anemometer 7. In this example, if it is determined that the first steady wind condition is not satisfied, it is determined whether the second steady wind condition is satisfied. When a wind with a wind speed turbulence intensity equal to or greater than the specified intensity acts on the wind turbine blades 6, the magnitude of the turning force acting on the nacelle 3 fluctuates suddenly. For this reason, even if the nacelle brake mechanism 30 is operating normally, the nacelle sliding amount may exceed the allowable sliding amount. In this regard, according to the present configuration, in order to determine that there is an abnormality in the nacelle brake mechanism 30, the wind speed turbulence intensity must be less than the specified intensity and the second specified wind condition must be satisfied. This allows for more accurate detection of an abnormality in the nacelle brake mechanism 30.

The third steady wind condition is satisfied when the wind speed in the wind power generation facility 1 is less than the second specified wind speed, which is the upper limit of the wind speed that specifies the steady wind condition. The second specified wind speed is a wind speed greater than the first specified wind speed described above. In this example, if it is determined that the second steady wind condition is not satisfied, it is determined whether the third steady wind condition is satisfied. When a wind whose wind speed is equal to or greater than the second specified wind speed acts on the wind turbine blades 6, the magnitude of the turning force acting on the nacelle 3 becomes excessive. For this reason, even if the nacelle brake mechanism 30 is operating normally, the nacelle sliding amount may exceed the allowable sliding amount. In this respect, according to the present configuration, in order to determine that there is an abnormality in the nacelle brake mechanism 30, the wind speed must be less than the second specified wind speed and the third specified wind condition must be satisfied. This allows for more accurate detection of an abnormality in the nacelle brake mechanism 30. As an example, the second specified wind speed is a value equivalent to 1.5 to 3 times the first specified wind speed. The second specified wind speed may be the average wind speed or the instantaneous wind speed.

The fourth steady wind condition is satisfied when the wind direction deviation in the wind power generation facility 1 is less than the wind direction threshold, which is the upper limit value that defines the steady wind condition. Various patterns may be adopted for the process of determining whether the fourth steady wind condition is satisfied. For example, it may be determined whether the wind direction deviation while the wind speed is equal to or greater than a predetermined wind speed is less than the wind direction threshold. In addition, this determination process is not limited to simply comparing the wind direction deviation with the wind direction threshold. For example, if the number of times that the wind direction deviation exceeds the wind direction threshold while the wind speed is equal to or greater than a predetermined wind speed is less than the allowable number of times, the event of the wind direction deviation exceeding the wind direction threshold may be ignored and the wind direction deviation may be considered to be less than the wind direction threshold. In other words, if the number of times that the wind direction deviation exceeds the wind direction threshold while the wind speed is equal to or greater than a predetermined wind speed is less than the allowable number of times, it may be determined that the fourth steady wind condition is satisfied. The predetermined wind speed is, for example, a wind speed equal to or greater than the first specified wind speed. The predetermined wind speed may be the same value as the second specified wind speed, or may be a value lower than the second specified wind speed. The specified wind speed may be the average wind speed or the instantaneous wind speed.

In this example, if it is determined that the third steady wind condition is not satisfied, it is determined whether the fourth steady wind condition is satisfied. When wind with a wind direction deviation equal to or greater than the wind direction threshold acts on the wind turbine blades 6, the direction of the turning force acting on the nacelle 3 changes suddenly. For this reason, even if the nacelle brake mechanism 30 is operating normally, the nacelle sliding amount may exceed the allowable sliding amount. In this regard, according to the present configuration, in order to determine that there is an abnormality in the nacelle brake mechanism 30, the wind direction deviation needs to be less than the wind direction threshold and the fourth specified wind condition needs to be satisfied. This makes it possible to more accurately detect an abnormality in the nacelle brake mechanism 30.

The steady wind condition according to the present disclosure may include at least one of the first steady wind condition, the second steady wind condition, the third steady wind condition, or the fourth steady wind condition. For example, the steady wind condition may include the first steady wind condition and the third steady wind condition, but not the second steady wind condition and the fourth steady wind condition. Alternatively, the steady wind condition may include the fourth steady wind condition, but not the first steady wind condition, the second steady wind condition, or the third steady wind condition. Furthermore, if at least one of the first steady wind condition, the second steady wind condition, the third steady wind condition, or the fourth steady wind condition is satisfied, the wind condition determination unit 43 may determine that the steady wind condition is satisfied.

3. Additional Functional Configuration of Abnormality Diagnosis System 40
7 and 8, examples of functional configurations that the abnormality diagnosis system 40 may additionally include will be illustrated.

<3-1. Detection of abnormality in the yaw angle sensor 18 or the anemometer 7>
FIG. 7 is a schematic block diagram of an abnormality diagnosis system 40 having an additional functional configuration according to an embodiment of the present disclosure. The abnormality diagnosis system 40 illustrated in FIG. 7 is configured to detect an abnormality in the yaw angle sensor 18 and the anemometer 7. In this detection, a judgment result of an output judgment unit 47 that may be additionally provided in the abnormality diagnosis system 40 is used. The output judgment unit 47 is configured to judge whether an output deviation between the output of the wind power generation facility 1 and a target output is less than an output threshold value. The output deviation may be obtained by subtracting the target power from the power generated by the generator 11 measured by a power meter (not shown) that may be provided in the wind power generation facility 1. The judgment process of whether there is an abnormality in the yaw angle sensor 18 or the anemometer 7 is executed when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount and that the first steady wind condition is not satisfied. The principle by which an abnormality in the yaw angle sensor 18 and the anemometer 7 can be detected in this case is as follows.

The judgment result that the nacelle sliding amount exceeds the allowable sliding amount and the judgment result that the steady wind condition including the first steady wind condition is not satisfied (i.e., the judgment result that the wind speed is determined to be less than the first specified wind speed) are mutually contradictory. This is because, even if a wind with a wind speed less than the first specified wind speed acts on the wind turbine blades 6, the magnitude of the turning force acting on the nacelle 3 is relatively small, so that the nacelle 3 is unlikely to rotate excessively while the nacelle brake mechanism 30 is operating. Therefore, when the above two contradictory judgment results occur, it is suspected that there is an abnormality in the sensor that contributes to these judgment results. In other words, it is suspected that there is an abnormality in either the yaw angle sensor 18 used to calculate the allowable sliding amount or the anemometer 7 used to judge whether the first steady wind condition is satisfied.

The inventors of the present invention considered that it would be sufficient to determine whether the output deviation exceeds the output deviation threshold value in order to identify these abnormalities. FIG. 8 is a schematic graph showing time series data of the output deviation. The graph shows the output deviation under a situation in which it is determined that the nacelle slippage exceeds the allowable slippage amount and that the first steady wind condition is not satisfied. Since the power generation amount of the wind power generation facility 1 has a correlation with the wind speed, if the output deviation is less than the output threshold value (for example, the period from time T _w1 to time T _w2 ), it can be considered that the wind power generation facility 1 is operating appropriately according to the wind speed. As a result, no abnormality has occurred in the anemometer 7, and it can be considered that there is an abnormality in the yaw angle sensor 18. On the other hand, if the output deviation is equal to or greater than the output threshold value (for example, the period from time T _w2 to time T _w3 ), it can be considered that the rotation speed of the wind turbine blades 6 is too fast and the wind power generation facility 1 is in an over-output state. The over-output state occurs because there is an abnormality in the measurement results of the anemometer 7 that the control device 20 refers to as the basis for controlling the operation of the wind power generation facility 1. Therefore, there is no abnormality in the yaw angle sensor 18, and it can be considered that there is an abnormality in the anemometer 7.

To realize the above technical idea, the abnormality diagnosis system 40 illustrated in FIG. 7 additionally includes a yaw angle sensor abnormality diagnosis unit 51 and an anemometer abnormality diagnosis unit 53. The yaw angle sensor abnormality diagnosis unit 51 is configured to diagnose an abnormality in the yaw angle sensor 18 when it is determined that the nacelle sliding amount exceeds the allowable sliding amount, that the steady wind condition conditions including the first steady wind condition are not satisfied, and that the output deviation is less than the output threshold. The anemometer abnormality diagnosis unit 53 diagnoses an abnormality in the anemometer 7 when it is determined that the nacelle sliding amount exceeds the allowable sliding amount, that the steady wind condition conditions including the first steady wind condition are not satisfied, and that the output deviation is equal to or greater than the output threshold.

According to the above configuration, the abnormality diagnosis system 40 is realized that can detect not only an abnormality in the nacelle brake mechanism 30, but also an abnormality in the yaw angle sensor 18 and an abnormality in the anemometer 7. When the yaw angle sensor abnormality diagnosis unit 51 diagnoses that the yaw angle sensor 18 has an abnormality, the yaw angle sensor abnormality diagnosis unit 51 may generate a yaw angle sensor abnormality display command for displaying information indicating the abnormality on the display 83. This allows the user of the abnormality diagnosis system 40 to recognize the abnormality in the yaw angle sensor 18. Similarly, when the anemometer abnormality diagnosis unit 53 diagnoses that the anemometer 7 has an abnormality, the anemometer abnormality diagnosis unit 53 may generate an anemometer abnormality display command for displaying information indicating the abnormality on the display 83. This allows the user of the abnormality diagnosis system 40 to recognize the abnormality in the anemometer 7. The information displayed on the display 83 may be a text message, an error code expressed by alphanumeric characters, or a mark expressed by a figure.
Furthermore, the abnormality diagnosis system 40 according to another embodiment may include only either one of the yaw angle sensor abnormality diagnosis unit 51 or the anemometer abnormality diagnosis unit 53. Even in this case, an abnormality in either the yaw angle sensor 18 or the anemometer 7 can be detected.

In addition, the anemometer abnormality diagnosis unit 53 illustrated in FIG. 7 may generate a brake inspection display command for displaying information on the display 83 to prompt the inspection of the nacelle brake mechanism 30 when diagnosing an abnormality in the anemometer 7. If there is an abnormality in the anemometer 7, it is highly likely that the judgment result of the wind condition judgment unit 43 that the wind condition conditions including the first steady wind condition are not satisfied is incorrect. In other words, it is highly likely that the nacelle slippage exceeds the allowable slippage under a situation in which the wind speed is equal to or greater than the first specified wind speed, and there is a high possibility that an abnormality has occurred in the nacelle brake mechanism 30. According to the above configuration, the user of the abnormality diagnosis system 40 can inspect the nacelle brake mechanism 30 by checking the display 83, and it is possible to avoid failing to detect an abnormality in the nacelle brake mechanism 30. The information to prompt the inspection of the nacelle brake mechanism 30 displayed on the display 83 may be a text message, an error code expressed by alphanumeric characters, or a mark expressed by a figure.

<3-2. Configuration for changing wind direction tracking control>
The abnormality diagnosis system 40 illustrated in FIG. 7 may additionally include a time reduction command generating unit 57 for generating a time reduction command. The time reduction command is a command for reducing the deviation allowable time (see FIG. 3) used in the above-mentioned wind direction tracking control executed by the control device 20. When it is determined that the nacelle slippage has exceeded the allowable slippage and that neither the second steady wind condition nor the fourth steady wind condition is satisfied, the time reduction command generating unit 57 generates a time reduction command. By inputting the time reduction command to the control device 20, the deviation allowable time is changed to approximately half or less (more specifically, one-third or less). This allows the nacelle 3 to rotate with high tracking ability to changes in wind speed and wind direction. When neither the second steady wind condition nor the fourth steady wind condition is satisfied, both the wind speed disturbance and the wind direction disturbance of the wind hitting the wind turbine blades 6 are strong. In this case, the mechanical load in the wind power generation facility 1 fluctuates greatly. In order to reduce such load fluctuations, it is effective to improve the tracking ability of the nacelle 3. In addition, before and after the time reduction command is input to the control device 20, the wind direction tracking threshold value used in the wind direction tracking control is maintained in this example.

4. Determination process executed by the slippage determination unit 42
Fig. 9 shows time series data of the yaw angle according to one embodiment. The slippage determination unit 42 sets an arbitrary time period in the time series data of the yaw angle as a first monitoring period, and obtains the accumulated value of the nacelle slippage amount in the first monitoring period. Both _T11 and _T12 in Fig. 8 are examples of the first monitoring period. The areas of the hatched regions indicated by the symbols S1 and S2 are both examples of the accumulated value of the nacelle slippage amount in the first monitoring period.

The slippage determination unit 42 is configured to determine whether a phenomenon in which the cumulative value of the nacelle slippage in the first monitoring period exceeds the allowable slippage occurs a predetermined number of times or more within a second monitoring period that is longer than the first monitoring period. If the determination result is YES, it is determined that the nacelle slippage has exceeded the allowable slippage, and if the determination result is NO, it is determined that the nacelle slippage has not exceeded the allowable slippage. Details of the determination process will be explained below using the example in which the predetermined number of times is 2.

For example, if the accumulated value of the nacelle sliding amount in the first monitoring period indicated by _T11 exceeds the allowable sliding amount, a second monitoring period is set, calculated from time Ts, which is the starting time of the first monitoring period. Then, an arbitrary first monitoring period is set in a time zone after the first monitoring period indicated by _T11 , and the accumulated value of the nacelle sliding amount in the first monitoring period is obtained. It is assumed that the accumulated value of the nacelle sliding amount exceeds the allowable sliding amount in another first monitoring period (for example, the first monitoring period indicated by _T12 ) before the second monitoring period has elapsed. In this case, the sliding determination unit 42 determines that the nacelle sliding amount has exceeded the allowable sliding amount.

Even if the abnormality in the nacelle brake mechanism 30 is minor, the abnormality is expressed as the cumulative value of the nacelle sliding amount within the first monitoring period. With the above configuration, abnormalities in the nacelle brake mechanism 30 can be detected at an earlier stage.

At least one of the parameters referenced by the wind condition determining unit 43 (see FIG. 5) is preferably measured during the first monitoring period (periods indicated by _T11 and _T12 in the example of FIG. 8). In other words, the wind speed used by the wind condition determining unit 43 to determine whether the first steady wind condition, the second steady wind condition, or the third steady wind condition is satisfied is preferably a wind speed measured during the first monitoring period. The same applies to the wind direction and yaw angle used to determine whether the fourth steady wind condition is satisfied. With this configuration, when the nacelle sliding amount exceeds the allowable sliding amount, it becomes possible to accurately grasp the wind conditions at that timing.

<5. Abnormality diagnosis process for wind power generation facility 1>
10 and 11 , the abnormality diagnosis process of the wind power generation facility 1 will be described. The abnormality diagnosis process is a process executed by the processor 72, and is an example of a method for diagnosing an abnormality of the wind power generation facility 1. In the following, "step" may be abbreviated as "S".

First, the processor 72 acquires nacelle time series data (S11). The processor 72 that executes S11 is an example of the nacelle time series data acquisition unit 41. Next, the processor 72 determines whether the nacelle slippage has exceeded the allowable slippage based on the nacelle time series data acquired in S11 (S13). As a more specific example, it determines whether an event in which the cumulative value of the nacelle slippage in the first monitoring period exceeds the allowable slippage has occurred a predetermined number of times or more in the second monitoring period. The processor 72 that executes S13 is an example of the slippage determination unit 42. If it is determined that the nacelle slippage has not exceeded the allowable slippage (S13: NO), the processor 72 diagnoses that the nacelle brake mechanism 30 is normal and ends the abnormality diagnosis process.

If it is determined that the nacelle sliding amount exceeds the allowable sliding amount (S13: YES), the processor 72 determines whether the steady wind condition is satisfied (S15). Specifically, the processor 72 determines whether the first steady wind condition, the second steady wind condition, the third steady wind condition, and the fourth steady wind condition are all satisfied. If any one of the conditions is not satisfied, the steady wind condition is not satisfied. If the processor 72 determines that the first steady wind condition is satisfied, it determines whether the second steady wind condition is satisfied. Next, if it is determined that the second steady wind condition is satisfied, it determines whether the third steady wind condition is satisfied. Next, if it is determined that the third steady wind condition is satisfied, it determines whether the fourth steady wind condition is satisfied. However, in this determination process, even if any one of the conditions is not satisfied, the processor 72 determines whether all the other conditions are satisfied. The processor 72 that executes S15 is an example of the wind condition determination unit 43.

If it is determined that the steady wind condition is satisfied (S15: YES), the processor 72 diagnoses that there is an abnormality in the nacelle brake mechanism 30 (S17) and ends the abnormality diagnosis process. The processor 72 that executes S17 is an example of the nacelle brake abnormality diagnosis unit 45.

If it is determined that the steady wind condition is not satisfied (S15: NO), the processor 72 determines whether the first steady wind condition was not satisfied in S15 (S19). In other words, the processor 72 determines whether the wind speed is low at the time when the nacelle sliding amount exceeds the allowable sliding amount (S19).

If it is determined that the first steady wind condition is not satisfied (S19: YES), the processor 72 determines whether the output deviation is less than the output threshold (S21). The processor 72 that executes S21 is an example of the output determination unit 47. If it is determined that the output deviation is less than the output threshold (S21: YES), the processor 72 diagnoses that there is an abnormality in the yaw angle sensor 18 (S23) and ends the abnormality diagnosis process. The processor 72 that executes S23 is an example of the yaw angle sensor abnormality diagnosis unit 51. In addition, in S23, the processor 72 may generate the brake inspection display command described above. The generated brake inspection display command is input to the display 83.

If it is determined that the output deviation is equal to or greater than the output threshold (S21: NO), the processor 72 diagnoses that there is an abnormality in the anemometer 7 (S25) and ends the abnormality diagnosis process. The processor 72 that executes S25 is an example of the anemometer abnormality diagnosis unit 53.

If it is determined in S19 above that the first steady wind condition is satisfied (i.e., the wind speed is not low) (S19: NO), the processor 72 proceeds to S31 shown in FIG. 11. The processor 72 determines whether the second steady wind condition and the fourth steady wind condition are both not satisfied in S15 (S31). If it is determined in S15 that the wind speed turbulence is equal to or greater than a specified intensity and that the wind direction deviation is equal to or greater than the wind direction threshold (S31: YES), the processor 72 proceeds to S33.

The processor 72 determines whether the wind power generation facility 1 that does not satisfy the second steady wind condition and the fourth steady wind condition satisfies the site condition (S33). The site condition is satisfied when the site on which the wind power generation facility 1 is installed corresponds to a site where wind conditions with strong wind speed disturbances and strong wind direction disturbances occur on a daily basis. A site that satisfies the site condition should be able to tolerate both strong wind speed disturbances and strong wind direction disturbances.

In this example, in the database stored in the abnormality diagnosis system 40, a power generation equipment ID for identifying the wind power generation equipment 1 and a site ID for identifying the site where the wind power generation equipment 1 is installed are stored in association with each other. In the database, if the site ID is known, it is possible to determine whether the site satisfies the site conditions. The processor 72 refers to the database and determines whether the wind power generation equipment 1, which does not satisfy the second steady wind condition and the fourth steady wind condition, satisfies the site conditions (S33). If the site conditions are satisfied (S33: YES), the wind conditions in which both the wind speed disturbance and the wind direction disturbance are strong are accepted, and the processor 72 generates a time reduction command (S35). The processor 72 that executes S35 is an example of the time reduction command generation unit 57. If the site conditions are not satisfied (S35: NO), the processor 72 generates a stop command to stop the wind power generation equipment 1. The stop command is input to the control device 20, and the operation of the wind power generation equipment 1 is stopped. The stop command may be a command to displace the wind turbine blades 6 of the wind power generation facility 1 to the feather position. Note that in S31, if at least one of the second steady wind condition or the fourth steady wind condition is satisfied (S31: NO), the processor 72 ends the abnormality diagnosis process.

<6. Summary>
The contents described in the above-mentioned embodiments can be understood, for example, as follows.

1) An abnormality diagnosis system (40) for a wind power generation facility according to at least one embodiment of the present disclosure includes:
An abnormality diagnosis system for a wind power generation facility for performing abnormality diagnosis on a wind power generation facility (1) including a nacelle (3), a nacelle brake mechanism (30) for braking the rotation of the nacelle, and a yaw angle sensor for detecting the yaw angle of the nacelle,
a slippage determination unit (42) for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount based on the yaw angle measured by the yaw angle sensor;
a wind condition determination unit (43) for determining whether the wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis unit (45) for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount;
Equipped with.

According to the inventors' findings, when the steady wind conditions, which are wind conditions assumed in the rated operation of the wind power generation facility, are satisfied, if the nacelle sliding amount exceeds the allowable sliding amount even though the nacelle brake mechanism is operating, there is a high possibility that some abnormality has occurred in the nacelle brake mechanism. Specifically, there is a possibility that an abnormality such as wear or deterioration of the brake pads, or excessive oil adhesion to the brake pads has occurred. The inventors have found that even if such an abnormality occurs at a minor level, the nacelle sliding amount exceeds the allowable sliding amount. In this regard, according to the configuration of 1) above, when it is determined that the steady wind conditions are satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount, the nacelle brake abnormality diagnosis unit diagnoses that there is an abnormality in the nacelle brake mechanism. Thus, an abnormality diagnosis system for wind power generation facility that can detect an abnormality in the nacelle brake mechanism at an early stage is realized.

2) In some embodiments, the abnormality diagnosis system for the wind power generation facility described in 1) above,
The steady wind conditions include a first steady wind condition under which the wind speed at the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind conditions.

When wind exceeding the first specified wind speed acts on the wind turbine blades of a wind power generation facility, a certain degree of rotational force acts on the nacelle. If the amount of nacelle sliding exceeds the allowable amount at this time, there is a high possibility that an abnormality has occurred in the nacelle brake mechanism. In this regard, according to the configuration of 2) above, in order to determine that there is an abnormality in the nacelle brake mechanism, the first steady wind condition needs to be satisfied. This makes it possible to more accurately detect an abnormality in the nacelle brake mechanism.

3) In some embodiments, the abnormality diagnosis system for the wind power generation facility described in 1) or 2) above,
The steady wind conditions include a second steady wind condition in which the turbulence intensity of the wind speed at the wind power generation facility is less than a specified intensity that is an upper limit value of the turbulence intensity that defines the steady wind conditions.

When wind with a turbulence intensity of wind speed equal to or greater than a specified intensity acts on the wind turbine blades, the magnitude of the turning force acting on the nacelle changes suddenly. As a result, even if the nacelle brake mechanism is operating normally, the amount of nacelle sliding may exceed the allowable amount of sliding. In this regard, according to the configuration of 3) above, in order to determine that there is an abnormality in the nacelle brake mechanism, the second specified wind condition needs to be satisfied. This makes it possible to more accurately detect an abnormality in the nacelle brake mechanism.

4) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 3) above,
The steady wind conditions include a third steady wind condition under which the wind speed at the wind power generation facility is less than a second specified wind speed, which is an upper limit value of the wind speed that defines the steady wind conditions.

When wind with a speed equal to or greater than the second specified wind speed acts on the wind turbine blades, the magnitude of the rotational force acting on the nacelle becomes excessive. As a result, even if the nacelle brake mechanism is operating normally, the amount of nacelle sliding may exceed the allowable amount of sliding. In this regard, according to the configuration of 4) above, in order to determine that there is an abnormality in the nacelle brake mechanism, the third specified wind condition needs to be satisfied. This makes it possible to more accurately detect an abnormality in the nacelle brake mechanism.

5) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 4) above,
The steady wind condition includes a fourth steady wind condition in which a wind direction deviation, which is the angle of the wind direction measured by an anemometer of the wind power generation equipment relative to the rotation axis of the wind turbine rotor of the wind power generation equipment, is less than a wind direction threshold, which is the upper limit value of the wind direction deviation that defines the steady wind condition.

When wind with a wind direction deviation equal to or greater than the wind direction threshold acts on the wind turbine blades, the direction of the turning force acting on the nacelle changes suddenly. As a result, even if the nacelle brake mechanism is operating normally, the amount of nacelle sliding may exceed the allowable amount of sliding. In this regard, according to the configuration of 5) above, in order to determine that there is an abnormality in the nacelle brake mechanism, the fourth prescribed wind condition needs to be satisfied. This makes it possible to more accurately detect an abnormality in the nacelle brake mechanism.

6) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 5) above,
the steady wind condition includes a first steady wind condition in which a wind speed at the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind condition;
The abnormality diagnosis system for the wind power generation facility includes:
an output determination unit (47) for determining whether an output deviation between an output of the wind power generation facility and a target output is less than an output threshold;
a yaw angle sensor abnormality diagnosis unit (51) configured to diagnose an abnormality in the yaw angle sensor when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is less than the output threshold value; and
It further comprises:

Even if wind with a wind speed below the first specified wind speed acts on the wind turbine blades, the magnitude of the rotational force acting on the nacelle is relatively small. In this case, the nacelle is unlikely to rotate excessively while the nacelle brake mechanism is operating. If the nacelle sliding amount exceeds the allowable sliding amount despite this, there is a high possibility that an abnormality has occurred in the yaw angle sensor or an anemometer for measuring wind speed. If the output deviation is less than the output threshold, the wind power generation equipment can be considered to be operating appropriately according to the wind speed, and it can be considered that no abnormality has occurred in the anemometer. As a result, it can be considered that there is an abnormality in the yaw angle sensor. In this regard, according to the configuration of 6) above, the above technical idea is realized by the yaw angle sensor abnormality diagnosis unit. This realizes an abnormality diagnosis system for wind power generation equipment that can detect not only abnormalities in the nacelle brake mechanism but also abnormalities in the yaw angle sensor.

7) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 6) above,
the steady wind condition includes a first steady wind condition in which a wind speed measured by an anemometer of the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind condition;
The abnormality diagnosis system for the wind power generation facility includes:
an output determination unit (47) for determining whether an output deviation between an output of the wind power generation facility and a target output is less than an output threshold;
an anemometer abnormality diagnosis unit (53) for diagnosing an abnormality in the anemometer when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is equal to or greater than the output threshold value; and
It further comprises:

When the wind speed is less than the first specified wind speed and the nacelle sliding amount exceeds the allowable sliding amount, there is a high possibility that an abnormality has occurred in the yaw angle sensor or an anemometer due to the reasons already described. If the output deviation is equal to or greater than the output threshold, it can be assumed that the reason is that the actual wind speed is greater than the value measured by the anemometer. As a result, it can be assumed that there is an abnormality in the anemometer. In this regard, according to the configuration of 7) above, the above technical idea is realized by the anemometer abnormality diagnosis unit. This realizes an abnormality diagnosis system for wind power generation equipment that can detect not only abnormalities in the nacelle brake mechanism but also abnormalities in the anemometer.

8) In some embodiments, the abnormality diagnosis system for the wind power generation facility described in 7) above,
The anemometer abnormality diagnosis unit is configured to generate a brake inspection display command for displaying information on a display device prompting inspection of the nacelle brake mechanism when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is equal to or greater than the output threshold value.

If there is an abnormality in the anemometer, there is a high possibility that the wind condition determination unit's determination result that the wind condition conditions are not satisfied is incorrect. In other words, there is a high possibility that the nacelle sliding amount exceeds the allowable sliding amount when the wind speed is equal to or greater than the first specified wind speed, and there is a high possibility that an abnormality has occurred in the nacelle brake mechanism. In this regard, according to the configuration of 8) above, a user of the abnormality diagnosis system for wind power generation equipment can inspect the nacelle brake mechanism by checking the display, and it is possible to avoid failing to detect an abnormality in the nacelle brake mechanism.

9) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 8) above,
The wind power generation facility includes a control device (20) configured to control a yaw motor for rotating the nacelle so that an event in which an absolute value of a wind direction deviation, which is an angle of a wind direction measured by an anemometer of the wind power generation facility with respect to a rotation axis of a wind turbine rotor of the wind power generation facility, is equal to or greater than a wind direction tracking threshold value does not continue for more than an allowable deviation time,
The steady wind condition is:
A second steady wind condition in which a turbulence intensity of a wind speed in the wind power generation facility is less than a specified intensity that is an upper limit value of the turbulence intensity that defines the steady wind condition; and
A fourth steady wind condition in which the wind direction deviation is less than a wind direction threshold that is an upper limit value of the wind direction deviation that defines the steady wind condition;
Including,
the wind condition determination unit is configured to determine that the steady wind condition is satisfied when both the second steady wind condition and the fourth steady wind condition are satisfied;
The abnormality diagnosis system for the wind power generation facility includes:
The aircraft further includes a time reduction command generating unit (57) for generating a time reduction command for reducing the deviation allowable time used in controlling the yaw motor when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount and when it is determined that neither the second steady wind condition nor the fourth steady wind condition is satisfied.

As described above, when neither the second nor the fourth steady wind condition is satisfied, there is strong disturbance in both wind speed and direction. If the nacelle sliding amount exceeds the allowable sliding amount under such circumstances, there is a high possibility that a strong turning force is acting on the nacelle such that braking by the nacelle brake is ineffective, even though there is no abnormality in the nacelle brake mechanism. In this regard, according to the configuration of 9) above, in this case, the deviation allowable time used in controlling the yaw motor during normal operation of the wind power generation facility is reduced, so that the nacelle can be controlled to rotate with greater resilience to changes in wind conditions. This makes it possible to avoid the accumulation of mechanical fatigue in the nacelle brake mechanism.

10) In some embodiments, the abnormality diagnosis system for a wind power generation facility according to any one of 1) to 9) above,
The slippage determination unit is configured to determine whether an event in which a cumulative value of the nacelle slippage amount within a first monitoring period exceeds the allowable slippage amount occurs a predetermined number of times or more within a second monitoring period that is longer than the first monitoring period.

According to the configuration of 10) above, even if the abnormality in the nacelle brake mechanism is minor, the abnormality is expressed as the cumulative value of the nacelle sliding amount within the first monitoring period. Therefore, the abnormality in the nacelle brake mechanism can be detected at an earlier stage.

11) In some embodiments, the abnormality diagnosis system for the wind power generation facility described in 10) above,
At least one of the parameters referred to by the wind condition determining unit to determine whether the steady wind condition is satisfied is measured within the first monitoring period.

The configuration of 11) above makes it possible to accurately grasp the wind conditions at the time when the nacelle sliding amount exceeds the allowable sliding amount.

12) A method for diagnosing an abnormality in a wind power generation facility according to at least one embodiment of the present disclosure, comprising:
An abnormality diagnosis method for a wind power generation facility for performing abnormality diagnosis on a wind power generation facility including a nacelle, a nacelle brake mechanism for braking the rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle, comprising:
a slippage determination step (S13) for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount based on the yaw angle measured by the yaw angle sensor;
A wind condition determination step (S15) for determining whether the wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis step (S17) for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount;
Equipped with.

The configuration of 12) above provides an abnormality diagnosis method for wind power generation equipment that can detect abnormalities in the nacelle brake mechanism at an early stage for the same reason as 1) above.

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: Pitch mechanism 14: Yaw rotation mechanism 15: Pitch angle sensor 16: Yaw motor 18: Yaw angle sensor 20: Control device 21: Communication network 30: Nacelle brake mechanism 32: Hydraulic actuator 34: Brake pad 40: Abnormality diagnosis system 41: Nacelle time series data acquisition unit 42: Slippage determination unit 43: Wind condition determination unit 45: Nacelle brake abnormality diagnosis unit 47: Output determination unit 51: Yaw angle sensor abnormality diagnosis unit 53: Anemometer abnormality diagnosis unit 57: Time reduction command generation unit 72: Processor 74: RAM
76: ROM
80: Input I/F
82: Output I/F
83: Display 84: Bus θ: Angle

Claims (12)

An abnormality diagnosis system for a wind power generation facility for performing abnormality diagnosis on the wind power generation facility including a nacelle, a nacelle brake mechanism for braking the rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle,
a slippage determination unit for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount based on the yaw angle measured by the yaw angle sensor;
a wind condition determination unit for determining whether wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis unit for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount; and
An abnormality diagnosis system for wind power generation equipment. The steady wind condition includes a first steady wind condition in which a wind speed at the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind condition.
The abnormality diagnosis system for a wind power generation facility according to claim 1. The steady wind condition includes a second steady wind condition in which a turbulence intensity of a wind speed at the wind power generation facility is less than a specified intensity that is an upper limit value of the turbulence intensity that defines the steady wind condition.
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. The steady wind condition includes a third steady wind condition in which a wind speed at the wind power generation facility is less than a second specified wind speed, which is an upper limit of the wind speed that defines the steady wind condition.
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. The steady wind condition includes a fourth steady wind condition in which a wind direction deviation, which is an angle of a wind direction measured by an anemometer of the wind power generation facility with respect to a rotation axis of a wind turbine rotor of the wind power generation facility, is less than a wind direction threshold value, which is an upper limit value of the wind direction deviation that defines the steady wind condition.
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. the steady wind condition includes a first steady wind condition in which a wind speed at the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind condition;
The abnormality diagnosis system for the wind power generation facility includes:
an output determination unit for determining whether an output deviation between an output of the wind power generation facility and a target output is less than an output threshold;
a yaw angle sensor abnormality diagnosis unit configured to diagnose an abnormality in the yaw angle sensor when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is less than the output threshold value; and
Further comprising:
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. the steady wind condition includes a first steady wind condition in which a wind speed measured by an anemometer of the wind power generation facility is equal to or greater than a first specified wind speed, which is a lower limit of the wind speed that defines the steady wind condition;
The abnormality diagnosis system for the wind power generation facility includes:
an output determination unit for determining whether an output deviation between an output of the wind power generation facility and a target output is less than an output threshold;
an anemometer abnormality diagnosis unit for diagnosing an abnormality in the anemometer when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is equal to or greater than the output threshold value; and
Further comprising:
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. the anemometer abnormality diagnosis unit is configured to generate a brake inspection display command for displaying, on a display device, information prompting an inspection of the nacelle brake mechanism when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount, it is determined that the steady wind condition is not satisfied, and it is determined that the output deviation is equal to or greater than the output threshold value.
The abnormality diagnosis system for a wind power generation facility according to claim 7. the wind power generation facility includes a control device configured to control a yaw motor for rotating the nacelle so that an event in which an absolute value of a wind direction deviation, which is an angle of a wind direction measured by an anemometer of the wind power generation facility with respect to a rotation axis of a wind turbine rotor of the wind power generation facility, is equal to or greater than a wind direction tracking threshold, does not continue for more than an allowable deviation time;
The steady wind condition is:
A second steady wind condition in which a turbulence intensity of a wind speed in the wind power generation facility is less than a specified intensity that is an upper limit value of the turbulence intensity that defines the steady wind condition; and
A fourth steady wind condition in which the wind direction deviation is less than a wind direction threshold that is an upper limit value of the wind direction deviation that defines the steady wind condition;
Including,
the wind condition determination unit is configured to determine that the steady wind condition is satisfied when both the second steady wind condition and the fourth steady wind condition are satisfied;
The abnormality diagnosis system for the wind power generation facility includes:
a time reduction command generating unit configured to generate a time reduction command for reducing the deviation allowable time used in controlling the yaw motor when it is determined that the nacelle sliding amount has exceeded the allowable sliding amount and when it is determined that neither the second steady wind condition nor the fourth steady wind condition is satisfied,
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. the slippage determination unit is configured to determine whether an event in which a cumulative value of the nacelle slippage amount during a first monitoring period exceeds the allowable slippage amount occurs a predetermined number of times or more during a second monitoring period that is longer than the first monitoring period.
The abnormality diagnosis system for a wind power generation facility according to claim 1 or 2. At least one of the parameters referred to by the wind condition determining unit to determine whether the steady wind condition is satisfied is measured within the first monitoring period.
The abnormality diagnosis system for a wind power generation facility according to claim 10. An abnormality diagnosis method for a wind power generation facility for performing abnormality diagnosis on a wind power generation facility including a nacelle, a nacelle brake mechanism for braking the rotation of the nacelle, and a yaw angle sensor for detecting a yaw angle of the nacelle, comprising:
a slippage determination step for determining whether a nacelle slippage amount, which is a rotation amount of the nacelle while the nacelle brake mechanism is operating, has exceeded a tolerable slippage amount, based on the yaw angle measured by the yaw angle sensor;
a wind condition determination step for determining whether the wind conditions in the wind power generation facility satisfy a prescribed steady wind condition condition;
a nacelle brake abnormality diagnosis step for diagnosing an abnormality in the nacelle brake mechanism when it is determined that the steady wind condition is satisfied and that the nacelle sliding amount has exceeded the allowable sliding amount;
Equipped with
An abnormality diagnosis method for wind power generation equipment.

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