Anti-blade flutter control method and device for wind turbine generator and electronic equipment

Abstract

The invention relates to the technical field of wind generating sets, and discloses a wind generating set anti-blade flutter control method and device and electronic equipment. The method comprises the steps that the blade flutter early warning state of a set is obtained; executing variable-pitch control logic on the blade flutter early warning state of the unit to obtain a variable-pitch control result; and the rotating speed of the unit is protected in the variable pitch control process, and a rotating speed protection result is obtained. According to the anti-blade flutter control method and device for the wind turbine generator and the electronic equipment, the blade flutter risk area is recognized through the wind turbine generator according to the running state, low-rotating-speed running of the blades is maintained by adjusting the variable pitch angle, then blade flutter is restrained, the load of the wind turbine generator is effectively controlled, and safe and stable running of the wind turbine generator is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator sets, and in particular to a method, device and electronic equipment for controlling blade flutter of a wind turbine generator set. Background Art

[0002] Wind turbines are systems that convert the kinetic energy of wind into electrical energy. With the development of the wind power industry, in order to obtain a larger swept area and produce better power generation efficiency, wind turbine blades are developing in the direction of large-scale and lightweight, but this also makes the blades more susceptible to flutter. The alternating stress of flutter can cause fatigue cracks in the blades and lead to their fracture. Therefore, how to effectively suppress the flutter of large wind turbine blades is a key issue in the development of modern wind turbines.

[0003] The flutter problem of wind turbines is mainly reflected in the vibration of the blade root swing load. Advanced control strategies and sufficiently sensitive sensors play a vital role in real-time monitoring of the vibration state of the unit. They can be adjusted and optimized according to actual conditions to optimize the design of wind turbines and improve their operating efficiency and safety.

[0004] When the wind speed and direction change, the wind turbine can automatically yaw to the wind, ensuring the safe operation of the unit and achieving the maximum wind energy capture efficiency. However, when the unit fails to yaw automatically, the blades of the unit may vibrate, resulting in increased load and thus a safety hazard. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a method, device and electronic equipment for controlling anti-blade flutter of a wind turbine generator set, which are used to solve the above technical problems.

[0006] In a first aspect, a method for controlling blade flutter of a wind turbine is provided, comprising:

[0007] Get the blade flutter warning status of the unit;

[0008] Executing pitch control logic on the blade flutter warning state of the unit to obtain a pitch control result;

[0009] During the pitch control process, the rotational speed of the unit is protected to obtain a rotational speed protection result.

[0010] Further, the obtaining of the blade flutter warning state of the unit includes:

[0011] Detect the current operating status of the unit;

[0012] Detect 10-minute average wind speed and 180-second wind direction;

[0013] According to the preset wind speed and wind direction thresholds, determine whether the conditions for entering or exiting the blade flutter warning state are met;

[0014] When it is detected that the conditions for entering the blade flutter warning state are met, the blade flutter warning state of the unit is obtained.

[0015] Furthermore, the preset wind speed and wind direction thresholds include:

[0016] The wind speed threshold range for entering the blade flutter warning state is VIVWindspeed10minLimitdown to VIVWindspeed10minLimitup, and the wind direction threshold range is VIVWindD180sLimitdown to VIVWindD180sLimitup;

[0017] The wind speed threshold VIVOffWindspeed10minLimitdown, wind direction thresholds VIVOffWindD180sLimitdown and VIVOffWindD180sLimitup, and vibration value threshold VIVOffAccLimit for exiting blade flutter warning state;

[0018] And the 10-minute average wind speed threshold VIVOffWindspeed10minLimitUP is used to determine whether the wind speed of the entire venue exceeds the limit.

[0019] Furthermore, in the shutdown state, when the 60-second average of the wind rotor speed is less than the preset speed limit value, the pitch angle of the blades is gradually adjusted in equal intervals until the preset pitch angle limit value is reached.

[0020] Furthermore, the step of protecting the rotation speed of the unit during the pitch control process includes:

[0021] Start the first detection module and the second detection module. The first detection module monitors the average speed within 1s in real time, and the second detection module monitors the average speed within 60s in real time:

[0022] If the first detection module detects that the average value is greater than the protection threshold, the first protection measure is initiated to set the pitch target to the parking angle;

[0023] If the second detection module detects that the mean value is greater than the protection threshold, the first protection measure is turned off, the second protection measure is started, and the pitch target is set to a pitch angle one level higher than the current target value. After it is in place, it delays for 20 seconds and then re-enters the logic judgment.

[0024] Furthermore, it also includes determining whether the unit is in a maintenance operation state;

[0025] If the unit is in maintenance operation, the blade flutter strategy action will be suspended;

[0026] If the unit is not in maintenance operation, the blade flutter strategy action will continue to be executed.

[0027] In a second aspect, a wind turbine blade flutter control device is provided, which is characterized by comprising:

[0028] An acquisition module is used to obtain the blade flutter warning status of the unit;

[0029] The execution module is used to execute the pitch control logic on the blade flutter warning state of the unit to obtain the pitch control result.

[0030] The protection module is used to protect the rotational speed of the unit during the pitch control process and obtain a rotational speed protection result.

[0031] In a third aspect, a wind turbine anti-blade flutter control device is provided, comprising a processor and a memory storing program instructions, wherein the processor is used to execute a wind turbine anti-blade flutter control method as described in any one of the foregoing when running the program instructions.

[0032] In a fourth aspect, an electronic device is provided, comprising the wind turbine anti-blade flutter control device described above.

[0033] The invention adopting the above technical solution has the following advantages:

[0034] The present invention identifies the blade flutter risk area according to the operating status of the wind turbine set, maintains the blades running at a low speed by adjusting the pitch angle, and thus suppresses the blade flutter, so that the unit load is effectively controlled, ensuring the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0036] Figure 1 A flow chart of a method for controlling blade flutter of a wind turbine according to the present invention;

[0037] Figure 2 It is a logic block diagram of the action of the anti-blade flutter strategy in the anti-blade flutter control method of a wind turbine generator set according to the present invention;

[0038] Figure 3 A comparison diagram of pitch angles after entering an anti-blade flutter state in a wind turbine anti-blade flutter control method of the present invention;

[0039] Figure 4 A comparison diagram of the wind rotor speed after entering the anti-blade flutter state in a wind turbine anti-blade flutter control method of the present invention;

[0040] Figure 5 A comparison diagram of blade root Mx loads before and after entering an anti-blade flutter state in a wind turbine anti-blade flutter control method of the present invention;

[0041] Figure 6 A diagram showing blade root load conditions when the present invention is not used in a method for controlling blade flutter of a wind turbine according to the present invention;

[0042] Figure 7 A diagram showing the operation status of a wind turbine when the present invention is used in a method for controlling blade flutter of a wind turbine;

[0043] Figure 8 The present invention is a flow chart of a wind turbine blade flutter resistance control device. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0045] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the present invention belongs. The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to implement the embodiments of the present disclosure described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. Unless otherwise specified, the term "multiple" means two or more. In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship of objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B. The term "corresponding" can refer to an association relationship or a binding relationship, and A and B correspondingly refer to an association relationship or a binding relationship between A and B.

[0046] like Figures 1 to 8 As shown, a wind turbine anti-blade flutter control method of the present invention comprises:

[0047] Step S01, obtaining the blade flutter warning status of the unit;

[0048] Step S02, executing the pitch control logic for the blade flutter warning state of the unit to obtain the pitch control result;

[0049] Step S03: protecting the rotational speed of the unit during the pitch control process to obtain a rotational speed protection result.

[0050] Specifically, the present invention identifies the blade flutter risk area, maintains the blades running at a low speed by adjusting the pitch angle, and thereby suppresses the blade flutter, so that the unit load is effectively controlled, ensuring safe and stable operation of the unit.

[0051] First, blade flutter is identified through wind speed, wind direction and the unit's own status. After the blade flutter risk area is identified, the three blades are pitched to the shutdown angle, and then the pitch angle is adjusted through the rotor speed to maintain the rotor speed within a certain range, ensuring that the unit load is within a safe range and reducing the risk of blade flutter.

[0052] In some embodiments, obtaining a blade flutter warning state of a unit includes:

[0053] Detect the current operating status of the unit;

[0054] Detect 10-minute average wind speed and 180-second wind direction;

[0055] According to the preset wind speed and wind direction thresholds, determine whether the conditions for entering or exiting the blade flutter warning state are met;

[0056] When it is detected that the conditions for entering the blade flutter warning state are met, the blade flutter warning state of the unit is obtained.

[0057] In some embodiments, the preset wind speed and wind direction thresholds include:

[0058] The wind speed threshold range for entering the blade flutter warning state is VIVWindspeed10minLimitdown to VIVWindspeed10minLimitup, and the wind direction threshold range is VIVWindD180sLimitdown to VIVWindD180sLimitup;

[0059] The wind speed threshold VIVOffWindspeed10minLimitdown, wind direction thresholds VIVOffWindD180sLimitdown and VIVOffWindD180sLimitup, and vibration value threshold VIVOffAccLimit for exiting blade flutter warning state;

[0060] And the 10-minute average wind speed threshold VIVOffWindspeed10minLimitUP is used to determine whether the wind speed of the entire venue exceeds the limit.

[0061] Specifically, the anti-blade flutter strategy performs automatic anti-blade flutter warning, action (no action in maintenance state) and exit when the unit is in a shutdown state.

[0062] (1) Blade flutter risk area warning

[0063] The blade flutter risk zone warning logic includes blade flutter risk zone warning entry and exit. The specific logic is as follows:

[0064] ① Enter blade flutter warning mode: meet condition "A" (VIVflag = 1). A: "The unit is in shutdown state (including standby and fault shutdown)" "VIVWindspeed10minLimitdown≤10min average wind speed≤VIVWindspeed10minLimitup" and "VIVWindD180sLimitdown≤|180s wind direction|≤VIVWindD180sLimitup";

[0065] ② Exit blade flutter warning mode: condition "B" or "C" or "D" (VIVflag = 0).

[0066] B: The unit meets the start-up conditions and starts;

[0067] C: “10min average wind speed ≤ VIVOffWindspeed10minLimitdown” and “|180s wind direction| ≤ VIVOffWindD180sLimitdown or |180s wind direction| ≥ VIVOffWindD180sLimitup” and “10min vibration value ≤ VIVOffAccLimit”;

[0068] D: “10-minute average wind speed of the unit ≥ VIVOffWindspeed10minLimitUp” or “10-minute average wind speed of the entire site > VIVOffWindspeed10minLimitUp”.

[0069] In some embodiments, in the shutdown state, when the 60-second average of the wind rotor speed is less than a preset speed limit value, the pitch angle of the blades is gradually adjusted at equal intervals until the preset pitch angle limit value is reached.

[0070] In some embodiments, the step of protecting the rotation speed of the unit during the pitch control process includes:

[0071] Start the first detection module and the second detection module. The first detection module monitors the average speed within 1s in real time, and the second detection module monitors the average speed within 60s in real time:

[0072] If the first detection module detects that the mean value is greater than the protection threshold, start the first protection measure and set the pitch target to the shutdown angle;

[0073] If the second detection module detects that the mean value is greater than the protection threshold, turn off the first protection measure, start the second protection measure, set the pitch target to a pitch angle one level higher than the current target value, delay for 20 s after reaching the position, and then re-enter the logical judgment.

[0074] Specifically, ① After the unit enters the blade flutter warning state (VIVflag = 1);

[0075] ② Perform pitch control on blades 1, 2, and 3 according to the 60 s mean value of the wind turbine speed Rspeed60s.

[0076] ③ For blade opening, in an equally spaced (VIVPitchLdet) manner. In the shutdown state, when the speed Rspeed60s < VIVRSpeedLimit and lasts for VIVRSpeedLimitTime, open the blade to VIVPitchL. The calculation method of VIVPitchL is as follows:

[0077] VIVPitchL = VIVPitchLold - VIVPitchLdet;

[0078] VIVPitchL = max(VIVPitchL, VIVPitchLlimitmin);

[0079] In the formula:

[0080] VIVPitchLold—the target value of the previous pitch change (initial shutdown angle);

[0081] VIVPitchLdet—the interval of pitch change;

[0082] VIVPitchLlimitmin—the minimum protection limit value of pitch, obtained by linear interpolation of the 10 min average wind speed (interpolation table: VIVPitchLlimitminInputV, VIVPitchLlimitminInputP). (Interpolation maintains the boundary without extrapolation)

[0083] ④ Perform two-level protection on the speed during the whole process: VIVRSpeedLimitUp1s, VIVRSpeedLimitUp:

[0084] VIVRSpeedLimitUp1s: Monitor the 1 s mean value of the speed. After triggering, the pitch target is the shutdown angle;

[0085] VIVRSpeedLimitUp: monitors the 60s average speed. After being triggered, the pitch target is set to the higher level VIVPitchL (VIVPitchL=VIVPitchLold+VIVPitchLdet; VIVPitchL=min(stop angle, VIVPitchL)). After reaching the target, it delays for 20s before entering into logic judgment.

[0086] In some embodiments, it further includes determining whether the unit is in a maintenance operation state;

[0087] If the unit is in maintenance operation, the blade flutter strategy action will be suspended;

[0088] If the unit is not in maintenance operation, the blade flutter strategy action will continue to be executed.

[0089] Now, taking a 10MW wind turbine as an example, the action logic of resisting blade flutter is demonstrated.

[0090] It can be seen from Section 4 - Technical Solution of the present application that the risk of blade flutter is first identified, and after entering the blade flutter warning state, the pitch angles of the three blades are controlled.

[0091] According to the implementation case of this implementation, the unit yaw fault is set, and the simulation parameters are shown in Table 1.

[0092] Table 1 Description of simulation parameters

[0093] Wind turbines A 10.0MW unit <![CDATA[V wind ]]> V1 <![CDATA[Yaw error ]]> 0°:30°:330° Timestep 0.01s Power_Rated 10000kW Operation conditions Normal power production+Yaw failure

[0094] After the unit enters the blade flutter warning state, the pitch angles of the three blades are controlled according to the 60s average value of the wind rotor speed. The pitch angle of blade 1 changes as follows: Figure 3 As shown, the corresponding wind wheel speed is Figure 4 As shown, it can be seen that the wind wheel speed is maintained within a certain range.

[0095] Blade flutter is manifested in the blade root load Mx. The comparison is made before and after using the anti-blade flutter control method, such as Figure 5 As shown, the black line is without using the anti-blade flutter control method, and the red line is using the anti-blade flutter control method. It can be seen that after the anti-blade flutter strategy is implemented, the blade root load Mx is significantly reduced, ensuring that the unit load is within a safe range and improving the safety of the unit.

[0096] The present invention has been applied to wind farms, solving the problem of blade flutter of wind turbines in a shutdown state, and ensuring that the load of the turbines operates within a safe range. Figure 6 This is the blade root load when the shutdown flutter of the present invention is not used. At this time, the shimmy load has exceeded the design range; Figure 7To enable the unit operating state of the present invention, the unit automatically changes pitch after identifying the flutter area to ensure that the load is within a safe range.

[0097] In some other embodiments, a wind turbine anti-blade flutter control device is provided, comprising:

[0098] An acquisition module is used to obtain the blade flutter warning status of the unit;

[0099] The execution module is used to execute the pitch control logic for the blade flutter warning state of the unit to obtain the pitch control result.

[0100] The protection module is used to protect the speed of the unit during the pitch control process and obtain the speed protection result.

[0101] In other embodiments, a wind turbine blade flutter control device is provided, comprising a processor and a memory storing program instructions, wherein the processor is used to execute a wind turbine blade flutter control method as described above when running the program instructions.

[0102] In some other embodiments, an electronic device (such as a mobile phone) is provided, comprising the above-mentioned wind turbine anti-blade flutter control device.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for controlling blade flutter of a wind turbine, characterized in that: include: Get the blade flutter warning status of the unit; Executing pitch control logic on the blade flutter warning state of the unit to obtain a pitch control result; During the pitch control process, the rotational speed of the unit is protected to obtain a rotational speed protection result.

2. A wind turbine anti-blade flutter control method according to claim 1, characterized in that: The obtaining of the blade flutter warning state of the unit includes: Detect the current operating status of the unit; Detect 10-minute average wind speed and 180-second wind direction; According to the preset wind speed and wind direction thresholds, determine whether the conditions for entering or exiting the blade flutter warning state are met; When it is detected that the conditions for entering the blade flutter warning state are met, the blade flutter warning state of the unit is obtained.

3. A wind turbine anti-blade flutter control method according to claim 2, characterized in that: The preset wind speed and wind direction thresholds include: The wind speed threshold range for entering the blade flutter warning state is VIVWindspeed10minLimitdown to VIVWindspeed10minLimitup, and the wind direction threshold range is VIVWindD180sLimitdown to VIVWindD180sLimitup; The wind speed threshold VIVOffWindspeed10minLimitdown, wind direction thresholds VIVOffWindD180sLimitdown and VIVOffWindD180sLimitup, and vibration value threshold VIVOffAccLimit for exiting blade flutter warning state; And the 10-minute average wind speed threshold VIVOffWindspeed10minLimitUP is used to determine whether the wind speed of the entire venue exceeds the limit.

4. A wind turbine anti-blade flutter control method according to claim 2, characterized in that: The step of executing the pitch control logic for the blade flutter warning state of the unit includes: In the shutdown state, when the 60-second average of the wind rotor speed is less than the preset speed limit value, the pitch angle of the blades is gradually adjusted in equal intervals until the preset pitch angle limit value is reached.

5. A wind turbine anti-blade flutter control method according to claim 4, characterized in that: The step of protecting the rotation speed of the unit during the pitch control process includes: Start the first detection module and the second detection module. The first detection module monitors the average speed within 1s in real time, and the second detection module monitors the average speed within 60s in real time: If the first detection module detects that the average value is greater than the protection threshold, the first protection measure is initiated to set the pitch target to the parking angle; If the second detection module detects that the mean value is greater than the protection threshold, the first protection measure is turned off, the second protection measure is started, and the pitch target is set to a pitch angle one level higher than the current target value. After it is in place, it delays for 20 seconds and then re-enters the logic judgment.

6. A wind turbine anti-blade flutter control method according to claim 1, characterized in that: Also includes: Determine whether the unit is in maintenance operation status; If the unit is in maintenance operation, the blade flutter strategy action will be suspended; If the unit is not in maintenance operation, the blade flutter strategy action will continue to be executed.

7. A wind turbine blade flutter control device, characterized in that: include: An acquisition module is used to obtain the blade flutter warning status of the unit; The execution module is used to execute the pitch control logic on the blade flutter warning state of the unit to obtain the pitch control result. The protection module is used to protect the rotational speed of the unit during the pitch control process and obtain a rotational speed protection result.

8. A wind turbine blade flutter control device, comprising a processor and a memory storing program instructions, characterized in that: The processor is used to execute a wind turbine anti-blade flutter control method as described in any one of claims 1 to 6 when running the program instructions.

9. An electronic device, characterized in that: It comprises a wind turbine blade flutter resistance control device as described in claim 7 or 8.

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