Fan moving blade adjusting and calibrating method and fan

Abstract

The invention discloses a fan moving blade adjusting and calibrating method and a fan. The method comprises the following steps: firstly, determining a target area of a fan blade corresponding to a performance curve of a target fan; a first current signal is sent to a proportional valve, and a hydraulic cylinder drives fan blades to rotate in the first direction; when the fan blade rotates to a first limit, a first target value of the displacement sensor is obtained; a second current signal is sent to the proportional valve, and the hydraulic cylinder drives the fan blades to rotate in the second direction; when the fan blade rotates to a second limit, a second target value of the displacement sensor is obtained; and determining a calibration current range of the fan blade according to the first target value and the second target value. According to the application, the adjusted fan objects are wide, and different from the debugging mode of an electric actuating mechanism, the application can meet the extreme condition of fan operation adjustment, when the oil station and the fan moving blade adjustment calibration device are completely powered off, the hydraulic cylinder cannot move, the blade keeps the adjustment opening degree, and the rapid change of the flow and the pressure of the fan is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a fan blade adjustment and calibration method and a fan. Background Art

[0002] The three major fans in the power plant have been using electric actuators to adjust the hydraulic cylinders to adjust the blade angle. Electric actuators belong to the traditional mechanical transmission structure. When the fan hydraulic cylinder adjusts the blade angle, the electric actuator adjusts the mechanical servo valve inside the hydraulic cylinder to change the position of the hydraulic cylinder. The following problems are prone to occur during operation:

[0003] When adjusting the blades, the electric actuator is not flexible and is prone to getting stuck or moving.

[0004] After switching to the "Hydraulic Manual Operation" mode, it will immediately deviate from the correct position by 2° to 5°, and the manual adjustment will be fast and slow, and the blade angle cannot be accurately controlled, and thus the main air volume cannot be accurately adjusted. In addition, the large fluctuation of flow caused by the displacement will cause the unit to surge, seriously affecting the safe operation of the unit; the mechanical servo valve of the system has poor oil pollution resistance, and the valve is prone to jamming in winter, affecting the normal adjustment and control of the unit; the hydraulic system occupies a large space and is not easy to repair and maintain, and there are many static seal leakage points that pollute the surrounding environment. Summary of the invention

[0005] In view of the above problems, the present invention provides a method for adjusting and calibrating wind turbine blades and a wind turbine, so as to achieve accurate and rapid adjustment of wind turbine blades.

[0006] According to a first aspect of the present invention, a method for adjusting and calibrating a fan blade is provided, which is applied to a fan blade adjustment and calibration device, wherein the fan blade adjustment and calibration device comprises a controller, a hydraulic cylinder, a proportional valve and a displacement sensor, wherein an oil station is connected to the hydraulic cylinder via an oil inlet pipeline and an oil return pipeline, the proportional valve is arranged on the oil inlet pipeline, the displacement sensor is installed on the cylinder head of the hydraulic cylinder, and the hydraulic cylinder is connected to a fan blade for adjusting the angle of the fan blade;

[0007] The wind turbine blade adjustment calibration method comprises:

[0008] Determine a target area of ​​a fan blade corresponding to a performance curve of a target fan; the target area is determined by a first limit and a second limit;

[0009] Sending a first current signal to the proportional valve, so that the hydraulic cylinder drives the fan blades to rotate in a first direction;

[0010] When the fan blade rotates to a first limit position, obtaining a first target value of the displacement sensor;

[0011] Sending a second current signal to the proportional valve, so that the hydraulic cylinder drives the fan blades to rotate in a second direction;

[0012] When the fan blade rotates to a second limit position, obtaining a second target value of the displacement sensor;

[0013] A calibrated current range of the wind turbine blade is determined according to the first target value and the second target value.

[0014] Optionally, the method further includes:

[0015] Reducing the first target value by a preset value to obtain an updated first target value;

[0016] Increasing the second target value by a preset value to obtain an updated second target value;

[0017] The movable current range of the wind turbine blade is determined according to the updated first target value and the updated second target value.

[0018] Optionally, the preset value is 10% of the difference between the second target value and the first target value.

[0019] Optionally, determining the calibrated current range of the fan blade according to the first target value and the second target value includes:

[0020] Acquire a measurement interval of the displacement sensor; the measurement interval is determined by a lower limit target value and an upper limit target value;

[0021] According to the mapping relationship, the calibrated current range is mapped to the measurement interval.

[0022] Optionally, the mapping relationship is:

[0023] (ya)(dc)=(fa)(xc)

[0024] Among them, a is the lower limit target value, f is the upper limit target value, c is the first target value, d is the second target value, x is the variable within the calibration current range, and y is the variable mapped from x to the measurement interval.

[0025] Optionally, the measurement interval is 4-20mA.

[0026] According to a second aspect of the present invention, a wind turbine is provided, comprising a wind turbine blade adjustment calibration device, wherein the wind turbine blade adjustment calibration device applies the above-mentioned wind turbine blade adjustment calibration method.

[0027] According to a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the aforementioned wind turbine blade adjustment and calibration method is implemented.

[0028] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0029] The embodiment of this specification provides a method for adjusting and calibrating a fan blade and a fan, first determining the target area of ​​the fan blade corresponding to the performance curve of the target fan; the target area is determined by a first limit and a second limit; sending a first current signal to the proportional valve, and the hydraulic cylinder drives the fan blade to rotate in a first direction; when the fan blade rotates to the first limit, the first target value of the displacement sensor is obtained; sending a second current signal to the proportional valve, and the hydraulic cylinder drives the fan blade to rotate in a second direction; when the fan blade rotates to the second limit, the second target value of the displacement sensor is obtained; according to the first target value and the second target value, the calibration current range of the fan blade is determined. The fan object adjusted by this application is wide, and different from the debugging method of the electric actuator, this application can meet the extreme conditions of fan operation adjustment. When the oil station and the fan blade adjustment calibration device are completely powered off, the hydraulic cylinder's oil inlet and return are shut off, and the hydraulic cylinder will not move, so that the blade adjustment opening can be maintained to prevent the fan's flow and pressure from changing sharply.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the accompanying drawings, the same reference figures are used to represent the same components. In the drawings:

[0032] Figure 1 A flow chart of a wind turbine blade adjustment and calibration method in an embodiment of the present invention is shown.

[0033] Figure 2 A schematic diagram of a target area of ​​a wind turbine blade in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Combination Figure 1 As shown, the present invention provides a method for adjusting and calibrating a wind turbine blade, and the method for adjusting and calibrating a wind turbine blade includes steps 101 to 106:

[0039] Step 101: determining a target area of ​​a fan blade corresponding to a performance curve of a target fan; the target area is determined by a first limit and a second limit;

[0040] Step 102: sending a first current signal to the proportional valve, so that the hydraulic cylinder drives the fan blades to rotate in a first direction;

[0041] Step 103: when the fan blade rotates to a first limit position, obtaining a first target value of the displacement sensor;

[0042] Step 104: Sending a second current signal to the proportional valve, the hydraulic cylinder drives the fan blade to rotate in a second direction; the first direction and the second direction are opposite directions;

[0043] Step 105: When the fan blade rotates to a second limit position, obtaining a second target value of the displacement sensor;

[0044] Step 106: Determine a calibrated current range of the wind turbine blade according to the first target value and the second target value.

[0045] In this embodiment, the method is applied to a fan blade adjustment and calibration device. The fan blade adjustment and calibration device includes a hydraulic cylinder, a proportional valve, a solenoid valve, a displacement sensor and a controller. The oil station is connected to the hydraulic cylinder through an oil inlet pipeline and an oil return pipeline. The proportional valve and the solenoid valve are arranged on the oil inlet pipeline. The proportional valve adjusts the flow direction and flow rate of the hydraulic oil entering the hydraulic cylinder by receiving current signals of different sizes. The solenoid valve is used to control the on-off of the pipeline. The displacement sensor is installed on the cylinder head of the hydraulic cylinder. The hydraulic cylinder is connected to the adjustment disk of the fan blade to adjust the angle of the fan blade. At the same time, the controller of the device receives the displacement signal of the hydraulic cylinder and compares it with the given signal to perform PID adjustment to achieve precise adjustment of the displacement of the hydraulic cylinder.

[0046] Specifically, the target fan refers to a fan that has undergone technical transformation, and a fan blade adjustment calibration device is installed on the target fan. The hardware transformation refers to the installation of a proportional valve and a solenoid valve on the oil inlet pipeline. Since different fans have different performance curves corresponding to their blades, it is necessary to determine the target area for adjusting the blades corresponding to the target fan at the beginning.

[0047] In this embodiment, the target area refers to the effective adjustment range corresponding to the target fan blade. The target area is determined by the first limit and the second limit. The hydraulic cylinder drives the target fan blade to rotate. Since the blade adjustment stroke of each fan is different at the working point, the adjustment area of ​​each fan is not necessarily the same.

[0048] In this embodiment, combined with Figure 2 As shown in the figure, the measurement range of the displacement sensor is af, that is, 4-20mA, a is the lower limit target value, and f is the upper limit target value, corresponding to the maximum range that the displacement sensor can measure. The cd part in the displacement sensor measurement range refers to the effective adjustment range of the fan blades, which is also the calibration current range of the fan blades, and is determined by the first target value and the second target value of the displacement sensor. That is, the first target value represents the current value corresponding to point c, and the second target value represents the current value corresponding to point d.

[0049] After obtaining the first target value and the second target value, the staff can select a suitable numerical input between the first target value and the second target value to achieve the opening of the fan blades that the staff wants.

[0050] Since the blade adjustment stroke of each fan is different at the working point, its effective adjustment range is a part of the blade movable range, and the range outside the effective adjustment range is the non-working range. Because when the hydraulic cylinder is in the non-working range and stays for a long time (for example, more than 25s), the fan may be in an uncontrollable dangerous situation, which may cause the risk of the fan surging and shutting down. Therefore, the limit points c and d of the effective range of fan blade adjustment are soft limit points.

[0051] In addition, since the first target value and the second target value corresponding to each wind turbine may be different, in order to facilitate user use, universal parameter processing may be performed, that is, the first target value and the second target value of the target wind turbine may be mapped to the measurement interval.

[0052] In one embodiment, determining the calibrated current range of the fan blade may further include:

[0053] Acquire a measurement interval of the displacement sensor; the measurement interval is determined by a lower limit target value and an upper limit target value;

[0054] According to the mapping relationship, the calibrated current range is mapped to the measurement interval.

[0055] The mapping relationship is:

[0056] (ya)(dc)=(fa)(xc)

[0057] In the above formula, a is the lower limit target value, f is the upper limit target value, c is the first target value, d is the second target value, x is the variable within the calibration current range, and y is the variable mapped from x to the measurement interval.

[0058] In addition, the measurement interval of the displacement sensor given in this embodiment is 4-20mA, which is calibrated to the current value of the cd interval through linear transformation. Since the cd interval is within 4-20mA, it is sufficient to consider the feedback signal. When there is inertia in the hydraulic cylinder adjustment process and the soft limit points c and d are crossed, the deviation calculated by the PID control will change the polarity of the output and push the hydraulic cylinder back to the soft limit points c and d. At the same time, the bc and de intervals can be set as the alarm buffer zone (only signal is given, no action protection is performed). By calibrating the interval of the given value through the effective interval of the feedback value, the blade can be adjusted from 0 to 100% in the given interval. This setting can ensure that the adjustment of the moving blades can always be in a controllable state during the operation of the fan.

[0059] In one embodiment, determining the be interval may include:

[0060] Reducing the first target value by a preset value to obtain an updated first target value;

[0061] Increasing the second target value by a preset value to obtain an updated second target value;

[0062] The movable current range of the wind turbine blade is determined according to the updated first target value and the updated second target value.

[0063] The preset value is 10% of the difference between the second target value and the first target value.

[0064] In summary, the embodiment of the present invention provides a method for adjusting and calibrating a fan blade, first determining the target area of ​​the fan blade corresponding to the performance curve of the target fan; the target area is determined by the first limit and the second limit; sending a first current signal to the proportional valve, the hydraulic cylinder drives the fan blade to rotate in the first direction; when the fan blade rotates to the first limit, the first target value of the displacement sensor is obtained; sending a second current signal to the proportional valve, the hydraulic cylinder drives the fan blade to rotate in the second direction; when the fan blade rotates to the second limit, the second target value of the displacement sensor is obtained; according to the first target value and the second target value, the calibration current range of the fan blade is determined. The fan object adjusted by this application is wide, and different from the debugging method of the electric actuator, this application can meet the extreme conditions of fan operation adjustment. When the oil station and the fan blade adjustment calibration device are completely powered off, the hydraulic cylinder's oil inlet and return oil are shut off, and the hydraulic cylinder will not move, so that the blade adjustment opening can be maintained to prevent the fan flow and pressure from changing sharply.

[0065] Based on the same inventive concept, an embodiment of the present invention also provides a fan, including a fan blade adjustment calibration device. This device can replace the electric actuator to achieve the same adjustment performance. The proportional valve has a better cost advantage than the electric actuator.

[0066] The wind turbine blade adjustment calibration device applies the wind turbine blade adjustment calibration method in the above-mentioned embodiment. The specific contents will not be repeated here.

[0067] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the aforementioned wind turbine blade adjustment and calibration method is implemented.

[0068] In summary, the embodiment of the present invention provides a method for adjusting and calibrating a fan blade and a fan, first determining the target area of ​​the fan blade corresponding to the performance curve of the target fan; the target area is determined by the first limit and the second limit; sending a first current signal to the proportional valve, the hydraulic cylinder drives the fan blade to rotate in the first direction; when the fan blade rotates to the first limit, the first target value of the displacement sensor is obtained; sending a second current signal to the proportional valve, the hydraulic cylinder drives the fan blade to rotate in the second direction; when the fan blade rotates to the second limit, the second target value of the displacement sensor is obtained; according to the first target value and the second target value, the calibration current range of the fan blade is determined. The fan object adjusted by this application is wide, and different from the debugging method of the electric actuator, this application can meet the extreme conditions of fan operation adjustment. When the oil station and the fan blade adjustment calibration device are completely powered off, the hydraulic cylinder's oil inlet and return are shut off, and the hydraulic cylinder will not move, so that the blade adjustment opening can be maintained to prevent the fan flow and pressure from changing sharply.

[0069] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for adjusting and calibrating wind turbine blades, characterized in that: Applied to a fan blade adjustment calibration device, the fan blade adjustment calibration device includes a controller, a hydraulic cylinder, a proportional valve and a displacement sensor, the oil station is connected to the hydraulic cylinder through an oil inlet pipeline and an oil return pipeline, the proportional valve is arranged on the oil inlet pipeline, the displacement sensor is installed on the cylinder head of the hydraulic cylinder, and the hydraulic cylinder is connected to the fan blade to adjust the angle of the fan blade; The wind turbine blade adjustment calibration method comprises: Determine a target area of ​​the fan blade corresponding to the target fan performance curve; the target area is determined by the first limit and the second limit; Sending a first current signal to the proportional valve, so that the hydraulic cylinder drives the fan blades to rotate in a first direction; When the fan blade rotates to a first limit position, obtaining a first target value of the displacement sensor; Sending a second current signal to the proportional valve, so that the hydraulic cylinder drives the fan blades to rotate in a second direction; When the fan blade rotates to a second limit position, obtaining a second target value of the displacement sensor; A calibrated current range of the wind turbine blade is determined according to the first target value and the second target value.

2. The wind turbine blade adjustment calibration method according to claim 1, characterized in that: The method further comprises: Reducing the first target value by a preset value to obtain an updated first target value; Increasing the second target value by a preset value to obtain an updated second target value; The movable current range of the wind turbine blade is determined according to the updated first target value and the updated second target value.

3. The wind turbine blade adjustment calibration method according to claim 2, characterized in that: The preset value is 10% of the difference between the second target value and the first target value.

4. The wind turbine blade adjustment calibration method according to claim 1, characterized in that: Determining the calibrated current range of the fan blade according to the first target value and the second target value includes: Acquire a measurement interval of the displacement sensor; the measurement interval is determined by a lower limit target value and an upper limit target value; According to the mapping relationship, the calibrated current range is mapped to the measurement interval.

5. The wind turbine blade adjustment calibration method according to claim 4, characterized in that: The mapping relationship is: (ya)(dc)=(fa)(xc) Among them, a is the lower limit target value, f is the upper limit target value, c is the first target value, d is the second target value, x is the variable within the calibration current range, and y is the variable mapped from x to the measurement interval.

6. The wind turbine blade adjustment calibration method according to claim 4, characterized in that: The measuring interval is 4-20 mA.

7. A fan, characterized in that: It comprises a wind turbine blade adjustment calibration device, and the wind turbine blade adjustment calibration device applies the wind turbine blade adjustment calibration method according to any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, the wind turbine blade adjustment and calibration method according to any one of claims 1 to 6 is implemented.

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