Wind turbine generator set and redundant operation method, device and medium thereof

Abstract

The present disclosure provides a wind turbine generator set and a redundant operation method, device, and medium thereof. The redundant operation method of the wind turbine generator set includes: obtaining a first blade angle of a first blade detected by a first rotary encoder of a pitch system; obtaining a first trigger state of a first proximity switch corresponding to the first blade for pitch detection; obtaining a rotation speed of the wind turbine generator set and calculating a rotation speed change rate of the wind turbine generator set; and determining whether to enable redundant operation of the wind turbine generator set based on whether the first blade angle matches the first trigger state and the rotation speed change rate. The redundant operation method according to an embodiment of the present disclosure enables the wind turbine generator set to operate redundantly or fault-tolerantly when a main rotary encoder or proximity switch fails and the blades of the wind turbine generator set are balanced.

Description

Technical Field

[0001] The present disclosure generally relates to the field of wind power, and more specifically, to a wind turbine generator set and a redundant operation method, device, and medium thereof. Background Art

[0002] In a wind turbine, the pitch system plays an important role in achieving maximum power tracking and aerodynamic braking, and its reliability is directly related to the safety of the wind turbine.

[0003] When a single rotary encoder is used, it is easy for the rotary encoder to fail and the pitch system to fail to detect the blade angle (also called pitch angle, pitch angle), affecting the safety of the wind turbine.

[0004] However, since the main rotary encoder is installed at the tail of the motor, that is, on the drive device, when a problem occurs in the transmission mechanism, such as a mechanical failure of the reducer or an abnormality in the toothed belt, the main rotary encoder rotates normally, but the actual blade angle of the wind turbine does not change, that is, the driven device does not actually move. This situation cannot be detected using only the main rotary encoder.

[0005] In addition, the following problems may exist in the pitch control system using proximity switches for pitch control detection: the detection distance of the proximity switch is generally short, the distance between the proximity switch and the block becomes larger, or the proximity switch fails, or the proximity switch line is loose, which will cause the wind turbine to trigger failure. Since the main encoder is a sensor, it may also have failures such as data jumps. Therefore, when the proximity switch fails, for safety reasons, it cannot directly determine whether to continue to operate the wind turbine based on the angle of the main rotary encoder.

[0006] When the main rotary encoder and / or proximity switch detects that the pitch is not changed normally, or when the main rotary encoder and / or proximity switch itself fails, the machine needs to be shut down, which results in a waste of wind power resources. Summary of the invention

[0007] An object of the present disclosure is to provide a method that enables redundant or fault-tolerant operation of a wind turbine generator set.

[0008] According to one aspect of the present disclosure, a redundant operation method for a wind turbine generator set includes: obtaining a first blade angle of a first blade detected by a first rotary encoder of a pitch system; obtaining a first trigger state of a first proximity switch corresponding to the first blade for pitch detection; obtaining the rotational speed of the wind turbine generator set and calculating the rotational speed change rate of the wind turbine generator set; and determining whether to make the wind turbine generator set operate redundantly based on whether the first blade angle matches the first trigger state and the rotational speed change rate.

[0009] According to an embodiment of the present disclosure, the wind turbine generator system can be enabled to operate redundantly in response to a predetermined condition, wherein the predetermined condition includes that the first blade angle does not match the first trigger state and the absolute value of the rotation speed change rate is less than or equal to the first threshold for a first predetermined time.

[0010] According to an embodiment of the present disclosure, the redundant operation method may further include: obtaining a second blade angle of the second blade detected by the second rotary encoder and / or a third blade angle of the third blade detected by the third rotary encoder; obtaining a second trigger state of a second proximity switch corresponding to the second blade and / or a third trigger state of a third proximity switch corresponding to the third blade for pitch detection, and the predetermined condition also includes at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state.

[0011] According to an embodiment of the present disclosure, the first blade angle does not match the first trigger state, which means that the first proximity switch is triggered and the first blade angle is not within a predetermined range, or that the first blade angle is within the predetermined range and the first proximity switch is not triggered. The second blade angle matches the second trigger state, which means that the second proximity switch is triggered and the second blade angle is within the predetermined range. The third blade angle matches the third trigger state, which means that the third proximity switch is triggered and the third blade angle is within the predetermined range.

[0012] According to an embodiment of the present disclosure, the predetermined condition may further include that the first blade angle, the second blade angle, and the third blade angle are the same.

[0013] According to an embodiment of the present disclosure, the first proximity switch, the second proximity switch, and the third proximity switch can all be 5-degree proximity switches, and the first rotary encoder, the second rotary encoder, and the third rotary encoder can all be main rotary encoders installed at the tail of the pitch motor.

[0014] According to another aspect of the present disclosure, a computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed by a processor, the redundant operation method as described above is implemented.

[0015] According to another aspect of the present disclosure, a redundant operation device of a wind turbine generator set includes: a blade angle acquisition unit, configured to acquire a first blade angle of a first blade detected by a first rotary encoder of a pitch system; a trigger state acquisition unit, configured to acquire a first trigger state of a first proximity switch corresponding to the first blade for pitch detection; a speed change rate calculation unit, configured to acquire the speed of the wind turbine generator set and calculate the speed change rate of the wind turbine generator set; and a redundant operation control unit, configured to determine whether to make the wind turbine generator set operate redundantly based on whether the first blade angle matches the first trigger state and the speed change rate.

[0016] According to an embodiment of the present disclosure, the redundant operation control unit may be further configured to enable redundant operation of the wind turbine generator set in response to predetermined conditions, wherein the predetermined conditions include that the first blade angle does not match the first trigger state and the absolute value of the rotational speed change rate is less than or equal to a first threshold value for a first predetermined time.

[0017] According to an embodiment of the present disclosure, the blade angle acquisition unit may be further configured to: acquire a second blade angle of the second blade detected by the second rotary encoder and / or a third blade angle of the third blade detected by the third rotary encoder; the trigger state acquisition unit is further configured to acquire a second trigger state of a second proximity switch corresponding to the second blade or a third trigger state of a third proximity switch corresponding to the third blade for pitch detection, and the predetermined condition also includes at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state.

[0018] According to an embodiment of the present disclosure, the first blade angle does not match the first trigger state, which means that the first proximity switch is triggered and the first blade angle is not within a predetermined range, or that the first blade angle is within the predetermined range and the first proximity switch is not triggered. The second blade angle matches the second trigger state, which means that the second proximity switch is triggered and the second blade angle is within the predetermined range. The third blade angle matches the third trigger state, which means that the third proximity switch is triggered and the third blade angle is within the predetermined range.

[0019] According to an embodiment of the present disclosure, the predetermined condition may further include that the first blade angle, the second blade angle, and the third blade angle are the same.

[0020] According to an embodiment of the present disclosure, the first proximity switch, the second proximity switch, and the third proximity switch can all be 5-degree proximity switches, and the first rotary encoder, the second rotary encoder, and the third rotary encoder can be main rotary encoders installed at the tail of the pitch motor.

[0021] According to another aspect of the present disclosure, a wind turbine generator set includes the above redundant operation device.

[0022] The redundant operation method according to the embodiment of the present disclosure can enable the wind turbine generator set to operate redundantly or fault-tolerantly when a main rotary encoder or a proximity switch fails but the blades of the wind turbine generator set are balanced.

[0023] Compared with the existing detection methods, the redundant operation method according to the embodiment of the present disclosure involves fewer variables, does not require complex condition judgment, has high detection and operation efficiency, and is particularly suitable for toothed belt type variable pitch systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1is a schematic diagram showing an installation method of a proximity switch according to an embodiment of the present disclosure;

[0025] Figure 2 is a histogram showing the rate of change of the rotation speed of the wind turbine generator set when no blade jam occurs;

[0026] Figure 3 is a histogram showing the rate of change of the rotation speed of the wind turbine generator set when a stuck propeller occurs;

[0027] Figure 4 and Figure 5 is a flow chart showing a redundant operation method according to an embodiment of the present disclosure;

[0028] Figure 6 is a block diagram illustrating a redundant operation device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] Preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like components throughout.

[0030] The present invention starts from the operating mechanism of the wind turbine, utilizes the characteristics of the three-blade imbalance that causes the wind turbine to vibrate when the impeller rotates, and analyzes the operating conditions of the wind turbine according to the principle of eccentric vibration, so as to achieve redundant operation of the wind turbine when some components of the variable pitch system fail and the blades are balanced.

[0031] Different from the normal operation of a wind turbine when all components are in normal condition, redundant operation or fault-tolerant operation of a wind turbine means that when some components (for example, pitch detection components) fail or have a short-term failure, the wind turbine continues to operate without shutting down the wind turbine while ensuring safety.

[0032] The exciting force formula of the eccentric vibration according to the embodiment of the present disclosure may be:

[0033] F=meω 2 (1)

[0034] In formula (1), F is the exciting force generated by the eccentric mass; m is the mass of the eccentric mass; e is the eccentricity of the eccentric mass; and ω is the rotational angular velocity of the eccentric mass.

[0035] For a wind turbine, F can be equivalent to the vibration force generated on the wind turbine; ω can be the angular velocity of the impeller; m can be the equivalent mass of the impeller rotation, which is related to the density distribution of the rotating body; and e can be a function of the blade length of the wind turbine. For a wind turbine, since the rotational force it is subjected to mainly comes from the magnitude of the wind force on the blades, the imbalance of the three blades can be characterized.

[0036] Based on formula (1), it can be seen that the vibration value of the wind turbine generator set caused by the imbalance of the three blades is proportional to the angle difference of the three blades and proportional to the square of the angular velocity of the impeller rotation. This unbalanced force will cause the blades to have a sudden change in speed during rotation. And because the three blades of the wind turbine are subjected to inconsistent and constantly changing wind forces due to different pitch angles, the impeller speed ω of the wind turbine will also fluctuate.

[0037] Therefore, the redundant operation method according to the embodiment of the present disclosure can realize the redundant operation of the wind turbine generator set based on the rotation speed of the impeller.

[0038] For example, when an abnormality is detected in the rotary encoder of the pitch system, the speed change rate of the impeller can be calculated. If the speed change rate continues to be large (for example, the speed difference between the two times is greater than a predetermined value, such as 0.1rpm) and lasts for a certain period of time, it is considered that a real angle deviation has occurred and the blades are unbalanced.

[0039] If the rate of change of the impeller's rotational speed is not large, it is considered that there is no real deviation in the angles of the three blades, and thus it is judged that the proximity switch or rotary encoder is faulty, and the wind turbine enters fault-tolerant operation.

[0040] Although not shown, the rotary encoder may be a main rotary encoder installed at the tail of the pitch motor of the pitch system. The rotary encoder may be an incremental rotary encoder, an absolute rotary encoder, a hybrid rotary encoder, etc. During use, since the rotary encoder is generally installed at the tail of the pitch motor, the rotary encoder only indirectly measures the angle of the blade. There may be a situation where the rotary encoder detection result cannot correctly reflect whether the pitch is normal. Moreover, the rotary encoder itself may also have a data jump failure.

[0041] According to the embodiments of the present disclosure, the blade angle detected by the rotary encoder, the trigger state of the proximity switch, and the speed of the wind turbine generator set can be used to determine whether the blades are changing pitch normally, so that the wind turbine generator set can be operated redundantly when the blades are changing pitch normally (blade balance). During the redundant operation of the wind turbine generator set, the rotary encoder or the proximity switch can be troubleshooted and maintained, thereby improving the power generation of the wind turbine generator set. Figure 1 The installation method of the proximity switch of the present disclosure is described.

[0042] Figure 1 is a schematic diagram showing an installation method of a proximity switch according to an embodiment of the present disclosure.

[0043] like Figure 1As shown, the pitch system may include a reducer 101, a transmission wheel 102, a first tensioning wheel 103, a second tensioning wheel 104, a hub 105, a toothed belt 106, a blade mounting device 107 (for example, a pitch bearing and a component connected and fixed to the pitch bearing), a toothed belt fixing block 108, a toothed belt fixing block 109, a tensioning wheel fixing device 110, a 5-degree proximity switch 115, an 87-degree proximity switch 111 and a stop block 112.

[0044] The reducer 101 can be meshed with the pitch motor (not shown), the transmission wheel 102 can be mechanically connected to the output shaft of the reducer 101, the reducer 101 and the tension wheel fixing device 110 are fixedly installed on the hub 105, and the tension wheel fixing device 110 is used to install the first tension wheel 103 and the second tension wheel 104. The first tension wheel 103 and the second tension wheel 104 are used to tighten the toothed belt 106 to ensure the reliability of the transmission.

[0045] Both the 5 degree proximity switch 115 and the 87 degree proximity switch 111 can be installed on the wheel hub 105 , and the 5 degree proximity switch 115 is installed at the 5 degree position of the blade, and the 87 degree proximity switch 111 is installed at the 87 degree position of the blade. The stopper 112 is installed on the blade mounting device 107 and rotates with the blade mounting device 107 .

[0046] For each blade, the proximity switch according to the embodiment of the present disclosure may be a 5 degree proximity switch 115, however, the present disclosure is not limited thereto. The proximity switch may also be installed at other positions of the blade, and the installation position of the proximity switch is not specifically limited, as long as it can determine whether the blade is pitching normally.

[0047] The blade mounting device 107 may be a circular mechanical mechanism for mounting blades, and the toothed belt 106 may be along the side of the blade mounting device 107 and be in close contact with the side of the blade mounting device 107, thereby providing power for transmission. The toothed belt fixing block 109 and the tension wheel fixing device 110 are both used to fix the toothed belt 106 to the blade mounting device 107.

[0048] The working principle of the above-mentioned variable pitch system is as follows: when the pitch is required (i.e., changing the blade angle (also called the pitch angle or pitch angle)), the variable pitch motor (not shown) drives the reducer 101 to rotate, the reducer 101 drives the transmission wheel 102 to rotate, and when the transmission wheel 102 rotates, it drives the toothed belt 106 to move, and the toothed belt 106 drives the blade mounting device 107 to rotate, thereby changing the blade angle of the wind turbine and achieving the purpose of adjusting the pitch angle.

[0049] Generally, when the angle measured by the rotary encoder is around 5 degrees, and the block 112 rotates to the position of the 5-degree proximity switch 115 and triggers the 5-degree proximity switch 115, the pitch control system considers that the blade position is correct; when the angle measured by the rotary encoder is around 5 degrees and the proximity switch 115 is not triggered, it is considered that an abnormality has occurred, the pitch control system triggers a fault and causes the wind turbine to shut down.

[0050] Similarly, when the angle measured by the rotary encoder is near 87 degrees, and the block 112 rotates to the position of 87 degrees proximity switch 111 and triggers the 87 degree proximity switch 111, the pitch control system considers that the blade position is correct; when the angle measured by the rotary encoder is near 87 degrees and the proximity switch 111 is not triggered, it is considered that an abnormality has occurred.

[0051] However, the detection distance of the proximity switch is generally short. If the distance between the proximity switch and the block becomes longer, or if the proximity switch fails or the proximity switch line becomes loose, the wind turbine generator may be triggered.

[0052] In addition, the faulty proximity switch may be the proximity switch at the 5-degree position, the proximity switch at the 87-degree position, or the block may be loose, and the causes of these three faults are more numerous and complex. Therefore, there are many fault factors in the proximity switch detecting the blade position, and it is difficult to effectively solve all of them. If they are not handled, the wind turbine will falsely report faults more often, affecting the power generation.

[0053] According to an embodiment of the present disclosure, whether to make the wind turbine generator set operate redundantly or in a fault-tolerant manner is determined by utilizing the matching of the detection results of the proximity switch and the rotary encoder and the rotation speed of the wind turbine generator set.

[0054] Specifically as described above, according to the embodiments of the present disclosure, when the angles of the three blades of the wind turbine are inconsistent, it will cause aerodynamic imbalance of the impeller, resulting in a characteristic that the speed of the wind turbine (for example, the speed of the impeller) changes at a large rate. The specific detection method can be: when the proximity switch signal of the pitch control system is detected to be abnormal, the rate of change of the impeller speed is calculated; if the speed change rate is continuously large (the speed difference between the two times is greater than a predetermined value (for example, 0.1rpm), and lasts for a predetermined period of time, it is determined that an angle inconsistency fault has occurred, indicating that the blades have not been pitched normally. If the speed change rate is not large, and the corresponding blade angle detected by the rotary encoder is within the normal range, it is determined that there is no real deviation in the angles of the three blades, and thus it is determined that the proximity switch signal is triggered by mistake, causing the wind turbine to operate redundantly.

[0055] In addition, the specific detection method may also be: when an abnormality is detected in the main rotary encoder of the pitch system, the rate of change of the impeller speed is calculated; if the rate of change of the speed is continuously large (the difference between the two speeds is greater than a predetermined value (for example, 0.1 rpm) and lasts for a predetermined period of time, it is determined that an angle inconsistency fault has occurred, indicating that the blades have not been pitched normally; if the rate of change of the speed is not large and the corresponding proximity switch is triggered normally, it is determined that there is no real deviation in the angles of the three blades, thereby determining that a fault such as data jump occurs in the main rotary encoder, and causing the wind turbine to operate redundantly.

[0056] In other words, whether the wind turbine generator set can be made to perform redundant operation can be determined based on the matching of the blade angle detected by the main rotary encoder and the triggering state of the proximity switch and the change rate of the impeller rotation speed.

[0057] It should be noted that the speed of a wind turbine generator set may refer to the speed of an impeller, the speed of a blade, or the speed of a rotor (which may be converted to the speed of an impeller). In the present disclosure, only the speed of an impeller is used as an example for explanation.

[0058] Figure 2 is a histogram showing the rate of change of the rotation speed of the wind turbine generator set when no blade jam occurs. Figure 3 : is a histogram showing the rate of change of the rotation speed of the wind turbine generator set when a pitch sticking occurs.

[0059] When there is no blade jam (the angles of the three blades are consistent), the rate of change of the wind turbine speed is as follows: Figure 2 As shown, the horizontal axis is the sequence number, and the sampling period of each data can be 20ms. For example, the horizontal axis 150 means that from the leftmost axis (0 value), 150*20ms / 1000=3 seconds have passed, and the vertical axis is the difference between the two rotor speeds of the wind turbine (i.e., the rate of change).

[0060] The rate of change of the impeller speed refers to the absolute value of the difference between the two instantaneous speeds of the impeller, and may also refer to the absolute value of the difference between the two average speeds within a predetermined short time. For example, the difference in the average speed in a short time refers to the difference between the average speed of the first 400ms and the average speed of the last 400ms. This calculation method is applicable to situations where the speed of a wind turbine increases or decreases with large or small changes in wind speed.

[0061] When calculating the speed change rate of the impeller, continuous and multiple statistics and judgments can be performed to eliminate the influence of instantaneous and short-term speed mutations caused by accidental changes in wind speed and speed.

[0062] from Figure 2It can be seen from the histogram that the maximum value of the speed change rate of the wind turbine during operation and pitching is only 0.032 rpm.

[0063] The speed change rate of the wind turbine when the blade is stuck is as follows: Figure 3 As shown, the horizontal axis is the serial number, and the vertical axis is the difference between the two rotation speeds of the wind turbine's impeller (i.e., the rate of change). During the operation and retracting of the wind turbine, due to the stuck blade of a single blade, the angles of the three blades deviate. For example, starting from time 4869, the rate of change of the wind turbine's impeller speed gradually increases, and eventually increases from greater than 0.1rpm to 0.85rpm, and remains greater than 0.1rpm for a certain period of time.

[0064] Therefore, it is possible to determine whether the blade is stuck (blade imbalance) or normal pitch change (blade balance) based on whether the absolute value of the speed change rate is less than or equal to a first threshold value (for example, 0.1 rpm) for a first predetermined time. Figure 4 and Figure 5 This is described in detail.

[0065] Figure 4 and Figure 5 is a flow chart illustrating a redundant operation method according to an embodiment of the present disclosure.

[0066] like Figure 4 As shown, the redundant operation method of a wind turbine generator set according to an embodiment of the present disclosure may include steps S410, S420, S430 and S440.

[0067] In step S410, a first blade angle of a first blade detected by a first rotary encoder of a pitch control system may be acquired.

[0068] The first rotary encoder may be a main rotary encoder used for pitch detection of the first blade, and the first blade angle refers to a pitch angle or a pitch angle of the first blade.

[0069] In step S420, a first trigger state of a first proximity switch corresponding to the first blade for pitch detection is acquired.

[0070] The first proximity switch here can be the 5-degree proximity switch as described above, or a proximity switch installed at other positions, and the first trigger state can include two states: triggered and untriggered.

[0071] In step S430, the speed of the wind turbine generator set is obtained and the speed change rate of the wind turbine generator set is calculated. The meanings of the speed of the wind turbine generator set and the speed change rate are as described above and will not be repeated here.

[0072] In step S440, based on whether the first blade angle matches the first trigger state and the rotation speed change rate, it is determined whether to enable the wind turbine generator set to operate redundantly.

[0073] The mismatch between the first blade angle and the first trigger state means that the first proximity switch is triggered but the first blade angle is not within a predetermined range, or that the first blade angle is within the predetermined range but the first proximity switch is not triggered.

[0074] For example, the mismatch between the first blade angle and the first trigger state may mean that the first blade angle detected by the rotary encoder of the first blade is less than 3.5°, while the 5° proximity switch of the first blade is not triggered, or the first blade angle detected by the rotary encoder of the first blade is greater than 6.5°, while the 5° proximity switch of the first blade is still triggered. The mismatch between the first blade angle and the first trigger state may also mean that the 5° proximity switch of the first blade is triggered, and the first blade angle detected by the rotary encoder of the first blade is greater than 6.5°.

[0075] The above steps may be executed sequentially or in various ways. For example, the triggering state of the proximity switch of the first blade may be obtained first, and then the first blade angle of the first blade may be obtained.

[0076] like Figure 5 As shown, step S440 of determining whether to enable the wind turbine generator set to operate redundantly based on whether the first blade angle matches the first trigger state and the rotation speed change rate may include S541, S542, S543, S550 and S560.

[0077] For example, in steps S541 and S542, it may be determined whether the first blade angle matches the first trigger state and whether the rotation speed change rate of the wind turbine generator set is less than or equal to the threshold for a predetermined time.

[0078] In step S543, the wind turbine generator set is made to operate redundantly in response to a predetermined condition, where the predetermined condition may include that the first blade angle does not match the first trigger state and the absolute value of the rotation speed change rate is less than or equal to the first threshold for a first predetermined time.

[0079] The first threshold here may be predetermined, for example, the first threshold may be 0.1 rpm. The first predetermined time may also be predetermined, and the first threshold and the first predetermined time are not specifically limited.

[0080] In step S550, in response to the first blade angle matching the first trigger state, the wind turbine generator set may be enabled to operate normally.

[0081] In step S560, in response to the absolute value of the rotation speed change rate being greater than a first threshold value for a first predetermined time, the wind turbine generator set is shut down.

[0082] In order to improve the safety of the wind turbine generator set, the detection data of the pitch detection component of at least one of the other two blades may be used as a basis for judgment.

[0083] Therefore, the redundant operation method of the wind turbine generator set according to the embodiment of the present disclosure may further include obtaining the blade angles detected by the rotary encoders of the other two blades and the triggering state of the proximity switch. If the angle of at least one of the other two blades matches the triggering state of the proximity switch, the wind turbine generator set can be operated redundantly.

[0084] For example, the redundant operation method of a wind turbine generator set according to an embodiment of the present disclosure may also include: obtaining a second blade angle of a second blade detected by a second rotary encoder and / or a third blade angle of a third blade detected by a third rotary encoder; obtaining a second trigger state of a second proximity switch corresponding to the second blade for pitch detection and / or a third trigger state of a third proximity switch corresponding to the third blade.

[0085] The first rotary encoder, the second rotary encoder, and the third rotary encoder may all be main rotary encoders installed at the tail of the pitch motor.

[0086] The first proximity switch, the second proximity switch, and the third proximity switch may all be 5-degree proximity switches.

[0087] The predetermined condition may further include at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state.

[0088] Similar to the meaning of the first blade angle matching the first trigger state, the second blade angle matching the second trigger state means that the second proximity switch is triggered and the second blade angle is within a predetermined range, and the third blade angle matching the third trigger state means that the third proximity switch is triggered and the third blade angle is within a predetermined range.

[0089] Preferably, the predetermined condition may further include that the first blade angle, the second blade angle and the third blade angle are the same. In other words, when the detection angles of the rotary encoders are exactly the same and the proximity switch fails, the wind turbine generator set can be operated redundantly based on the rate of change of the impeller speed.

[0090] Figure 6 is a block diagram illustrating a redundant operation device according to an embodiment of the present disclosure.

[0091] The redundant operation device according to the embodiment of the present disclosure may include: a blade angle acquisition unit 610 , a trigger state acquisition unit 620 , a rotation speed change rate calculation unit 630 , and a redundant operation control unit 640 .

[0092] The blade angle acquisition unit 610 may be configured to acquire a first blade angle of a first blade detected by a first rotary encoder of the pitch system.

[0093] When using the pitch detection data of the other two blades for auxiliary judgment, the blade angle acquisition unit 610 can be further configured to acquire the second blade angle of the second blade detected by the second rotary encoder and / or the third blade angle of the third blade detected by the third rotary encoder.

[0094] As described above, the first rotary encoder, the second rotary encoder, and the third rotary encoder can all be main rotary encoders installed at the tail of the pitch motor, and the first proximity switch, the second proximity switch, and the third proximity switch can all be 5-degree proximity switches, however, the present disclosure is not limited to this.

[0095] The trigger state acquisition unit 620 may be configured to acquire a first trigger state of a first proximity switch corresponding to the first blade for pitch detection.

[0096] When using the pitch detection data of the other two blades for auxiliary judgment, the trigger state acquisition unit 620 can be further configured to acquire the second trigger state of the second proximity switch corresponding to the second blade for pitch detection or the third trigger state of the third proximity switch corresponding to the third blade.

[0097] The rotation speed change rate calculation unit 630 may be configured to obtain the rotation speed of the wind turbine generator set and calculate the rotation speed change rate of the wind turbine generator set.

[0098] The redundant operation control unit 640 may be configured to determine whether to enable the wind turbine generator set to operate redundantly based on whether the first blade angle matches the first trigger state and the rotation speed change rate.

[0099] Specifically, the redundant operation control unit 640 can be further configured to enable redundant operation of the wind turbine generator set in response to predetermined conditions, where the predetermined conditions may include that the first blade angle does not match the first trigger state and the absolute value of the rotational speed change rate is less than or equal to the first threshold for a first predetermined time.

[0100] In the case of using the pitch detection data of the other two blades for auxiliary judgment, the predetermined condition may also include at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state. Preferably, the predetermined condition may include the first blade angle, the second blade angle and the third blade angle being the same.

[0101] The blade angle acquisition unit 610, the trigger state acquisition unit 620, the speed change rate calculation unit 630, and the redundant operation control unit 640 can be implemented by software or by a combination of software or hardware. For example, the blade angle acquisition unit 610, the trigger state acquisition unit 620, the speed change rate calculation unit 630, and the redundant operation control unit 640 can be part of the controller or a software module.

[0102] Each operation of the above steps can be written as a software program or instruction. Therefore, the redundant operation method according to the exemplary embodiment of the present disclosure can be implemented via software. The computer-readable storage medium of the exemplary embodiment of the present disclosure can store a computer program. When the computer program is executed by the processor, the redundant operation method of the wind turbine generator set as the above exemplary embodiment is implemented.

[0103] According to various embodiments of the present disclosure, a device (e.g., a unit or their functions) or a method may be implemented by a program or instruction stored in a computer-readable storage medium. In the case where the instruction is executed by a processor or a controller, the processor or the controller may perform a function corresponding to the instruction or perform a method corresponding to the instruction. At least a portion of a module or a unit may be implemented (e.g., executed) by a processor or a controller. A unit may include a module, a program, a routine, an instruction set, and a process for performing at least one function. In one example, an instruction or software includes a machine code (such as a machine code generated by a compiler) directly executed by one or more processors or controllers, or a computer. In another example, an instruction or software includes a higher level code executed by one or more processors or computers using an interpreter. Instructions or software may be written in any programming language based on the block diagrams and flow charts shown in the accompanying drawings and the corresponding descriptions in the specification.

[0104] Computer-readable storage media include magnetic media such as floppy disks and magnetic tapes, optical media (including compact disks (CD) ROMs and DVD ROMs), magneto-optical media such as floppy disks, hardware devices such as ROMs, RAMs, and flash memories designed to store and execute program commands. Program commands include language codes executable by a computer using an interpreter and machine language codes generated by a compiler. The above-mentioned hardware devices can be implemented by one or more software modules for executing the operations of the various embodiments of the present disclosure.

[0105] The unit of the present disclosure may include at least one of the aforementioned components when some components are omitted or other components are added. The operation of the unit, module or other components may be performed sequentially, in parallel, in a loop or in a tentative manner. In addition, some operations may be performed in different orders, may be omitted or extended with other operations.

[0106] According to the embodiments of the present disclosure, during detection, at least one of the proximity switches of the three blades may be required to be triggered, which can effectively avoid abnormal conditions occurring in all three blades and resulting in failure to reach the correct blade position. Logically, the safe operation of the wind turbine can be strictly guaranteed to prevent misjudgment.

[0107] According to the embodiments of the present disclosure, synchronous judgment is performed using the blade angle detected by the rotary encoder and the triggering state of the proximity switch. In terms of technical effect, it is possible to effectively and accurately detect whether the blades of the variable pitch system are at the correct angle value, thereby achieving redundant and safe operation of the wind turbine after a proximity switch failure or a short-term failure.

[0108] According to the embodiments of the present disclosure, there is no need to judge the motor current, motor temperature, driver fault word, capacitor voltage and other signals. Redundant detection of the proximity switch fault of the variable pitch system can be achieved by using only the impeller speed value and the blade angle detected by the rotary encoder. Therefore, the algorithm is simple and reliable, and can automatically eliminate interference from various factors.

[0109] According to the embodiments of the present disclosure, no hardware modification is required, and the redundant operation effect can be achieved entirely through software, which can save a lot of technical modification costs.

[0110] Although some exemplary embodiments of the present disclosure have been shown and described, it should be understood by those skilled in the art that, without departing from the principles and spirit of the present disclosure, which are defined by the claims and their equivalents, these embodiments may be modified and improved, for example, the technical features of different embodiments may be combined. These modifications and improvements are all within the scope of the present disclosure.

Claims

1. A redundant operation method of a wind turbine generator set, characterized in that: include: Acquire a first blade angle of a first blade detected by a first rotary encoder of the pitch system; Acquire a first trigger state of a first proximity switch corresponding to the first blade for pitch detection; Acquiring the rotation speed of the wind turbine generator set and calculating the rotation speed change rate of the wind turbine generator set; In the case where the first blade angle does not match the first trigger state, determining whether to enable redundant operation of the wind turbine generator set according to the rotation speed change rate, The mismatch between the first blade angle and the first trigger state means that the first proximity switch is triggered but the first blade angle is not within a predetermined range, or that the first blade angle is within the predetermined range but the first proximity switch is not triggered.

2. The redundant operation method of a wind turbine generator set according to claim 1, characterized in that: The wind turbine generator set is enabled to operate redundantly in response to a predetermined condition, wherein the predetermined condition includes that the first blade angle does not match the first trigger state and an absolute value of the rotation speed change rate is less than or equal to a first threshold for a first predetermined time.

3. The redundant operation method of a wind turbine generator set according to claim 2, characterized in that: The redundant operation method further comprises: Acquire a second blade angle of the second blade detected by the second rotary encoder and / or a third blade angle of the third blade detected by the third rotary encoder; acquiring a second trigger state of a second proximity switch corresponding to the second blade and / or a third trigger state of a third proximity switch corresponding to the third blade for pitch detection, The predetermined condition further includes at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state.

4. The redundant operation method of a wind turbine generator set according to claim 3, characterized in that: The second blade angle matches the second trigger state when the second proximity switch is triggered and the second blade angle is within a predetermined range. The matching of the third blade angle and the third trigger state means that the third proximity switch is triggered and the third blade angle is within the predetermined range.

5. The redundant operation method of a wind turbine generator set according to claim 4, characterized in that: The predetermined condition also includes that the first blade angle, the second blade angle, and the third blade angle are the same.

6. The redundant operation method of a wind turbine generator set according to claim 3, characterized in that: The first proximity switch, the second proximity switch, and the third proximity switch are all 5-degree proximity switches, and the first rotary encoder, the second rotary encoder, and the third rotary encoder are all main rotary encoders installed at the tail of the pitch motor.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed by a processor, the redundant operation method according to any one of claims 1 to 6 is implemented.

8. A redundant operation device for a wind turbine generator set, characterized in that: include: a blade angle acquisition unit configured to acquire a first blade angle of a first blade detected by a first rotary encoder of the pitch system; a trigger state acquisition unit, configured to acquire a first trigger state of a first proximity switch corresponding to the first blade for pitch detection; a rotation speed change rate calculation unit, configured to obtain the rotation speed of the wind turbine generator set and calculate the rotation speed change rate of the wind turbine generator set; a redundant operation control unit configured to determine whether to enable redundant operation of the wind turbine generator set according to the rotation speed change rate when the first blade angle does not match the first trigger state; The mismatch between the first blade angle and the first trigger state means that the first proximity switch is triggered but the first blade angle is not within a predetermined range, or that the first blade angle is within the predetermined range but the first proximity switch is not triggered.

9. The redundant operation device of a wind turbine generator set according to claim 8, characterized in that: The redundant operation control unit is further configured to enable redundant operation of the wind turbine generator set in response to predetermined conditions, wherein the predetermined conditions include that the first blade angle does not match the first trigger state and the absolute value of the rotational speed change rate is less than or equal to a first threshold for a first predetermined time.

10. The redundant operation device of a wind turbine generator set according to claim 9, characterized in that: The blade angle acquisition unit is further configured to: acquire a second blade angle of a second blade detected by a second rotary encoder and / or a third blade angle of a third blade detected by a third rotary encoder; The trigger state acquisition unit is further configured to acquire a second trigger state of a second proximity switch corresponding to the second blade or a third trigger state of a third proximity switch corresponding to the third blade for pitch detection. The predetermined condition further includes at least one of the second blade angle matching the second trigger state and the third blade angle matching the third trigger state.

11. The redundant operation device of a wind turbine generator set according to claim 10, characterized in that: The second blade angle matches the second trigger state when the second proximity switch is triggered and the second blade angle is within a predetermined range. The matching of the third blade angle and the third trigger state means that the third proximity switch is triggered and the third blade angle is within the predetermined range.

12. The redundant operation device of a wind turbine generator set according to claim 11, characterized in that: The predetermined condition also includes that the first blade angle, the second blade angle, and the third blade angle are the same.

13. The redundant operation device of a wind turbine generator set according to claim 10, characterized in that: The first proximity switch, the second proximity switch, and the third proximity switch are all 5-degree proximity switches, and the first rotary encoder, the second rotary encoder, and the third rotary encoder are main rotary encoders installed at the tail of the pitch motor.

14. A wind turbine generator set, characterized in that: The method comprises a redundant operation device according to any one of claims 8 to 13.

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