Icing control method for wind power generation blade

Abstract

The invention relates to the technical field of wind power blade icing control, in particular to an icing control method for a wind power generation blade, and the method comprises the following steps: S1, receiving an environment icing instruction; s2, detecting that the wind power mismatching degree of the unit exceeds the standard; s3, starting a blade icing control system; s4, adjusting the blade angle alpha of the blade in real time; s5, the unit receives an environment icing ending instruction; and S6, the blade icing control is quitted. In the step S1, an icing sensing device is arranged on the wind driven generator to detect the environment icing condition and the blade icing condition, an environment icing signal is given out when the wind power blade is in an icing environment, and the icing sensing device adopts an icing sensor or a temperature and humidity sensor or meteorological early warning equipment. When the air flow angle is increased along with mismatching of the wind power, the attack angle is always kept within a specific range, the icing range of the blade surface can be controlled within a certain range, the icing range of the blade surface is reduced, and quick deicing and operation recovery are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade icing control, and in particular provides a method for controlling icing of wind turbine blades. Background Art

[0002] Wind power generation generates electricity through wind turbine blades driving the generator to rotate. In the operation of wind farm wind turbines, the blades are the most critical aerodynamic components of wind turbines, and their performance plays a vital role in the efficiency of wind power generation. Wind turbines are usually installed in places with high altitudes and abundant wind resources. The environment in which wind turbine blades are located during wind power generation is relatively complex. When the temperature is low, the blades will be covered with ice, forming irregular shapes and ice layers of different thicknesses on the blade surface, which will directly affect the performance and load safety of the unit, causing large deviations in the unit power curve, causing the unit to fail and shut down or even blade breakage.

[0003] Currently, when a wind turbine is in an icing environment, the fan is still controlled according to normal power generation. When the wind turbine is in an icing environment, as the shape of the ice-covered blades changes, the aerodynamic performance of the blades decreases, which will cause the ice coverage on the blade surface to expand, increasing the required de-icing range on the blade surface, which is not conducive to blade de-icing and resuming power generation after de-icing, and will cause a mismatch between the wind speed of the wind turbine and the power generation power of the wind turbine, causing the wind turbine to malfunction and shut down.

[0004] In the prior art, the following patents involve the field of wind turbine blade icing control: 1. Patent number "202410595268.8", patent name "A real-time monitoring system and method for icing and melting of wind turbine blades", including wind turbine blades, signal transceiver units, climate monitoring units and data processing units. The signal transceiver unit is installed on the wind turbine tower. The signal transceiver unit records and remotely monitors the icing data by recording the relevant position information between the surface of the wind turbine blade and the surface of the ice layer. No personnel are required to operate on site at the wind turbine, which improves monitoring efficiency and reduces labor costs. 2. The invention patent application with patent number "202410489246.3" and patent name "Blade icing judgment method and system for wind turbine operating status analysis" selects a certain number of normal operating data in the wind turbine data acquisition and monitoring system to establish a normal data set, and selects multiple data from the normal data set as a reference matrix, and the remaining data constitutes a training data set. The blade icing judgment method for wind turbine operating status analysis improves the accuracy of blade icing judgment and saves the cost of icing judgment.

[0005] The above-mentioned prior arts all focus on the icing problem of wind power generation, and all involve icing detection, which has the characteristics of reducing labor costs and improving the stability and safety of wind turbine operation. However, the prior arts are all icing detection schemes, and do not mention how to control the icing on the surface of the wind turbine blades within a certain range to reduce the icing range. Therefore, how to design an icing control method for wind power blades that can reduce the icing area of ​​the blades, achieve effective deicing of the blades, and reduce energy waste is a problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a method for controlling ice coating on wind turbine blades, which can reduce the laying area of ​​deicing devices, reduce costs, reduce energy waste, and achieve effective deicing of blades.

[0007] The present invention provides a method for controlling icing of wind turbine blades, and the icing control steps are as follows: S1: Receive the environment freezing command; S2: It is detected that the wind power mismatch of the unit exceeds the standard; S3: Start the blade icing control system; S4: real-time adjustment of the blade angle α; S5: The crew receives the command to end the environmental icing; S6: Exit blade icing control.

[0008] Furthermore, in S1, an icing sensing device is firstly arranged on the wind turbine to detect the icing condition of the environment and the icing condition of the blades, and an environmental icing signal is given when the wind turbine blades are in an icing environment.

[0009] Furthermore, in S4, when a wind power mismatch signal of the unit is received, the blade angle α of the blade is adjusted so that the angle of attack of each position of the wind turbine blade is always within a specific range.

[0010] Furthermore, the blade angle α is adjusted in real time according to the wind speed and the impeller speed.

[0011] Furthermore, assuming that the airflow angle is β, the angle of attack is the difference between the airflow angle and the wind turbine blade pitch angle, that is, the angle of attack is β-α; the blade pitch angle α is adjusted, and when the airflow angle β increases with the mismatch of wind power, the angle of attack β-α is always maintained within a specific range, thereby controlling the ice coverage range on the blade surface within a certain range.

[0012] Furthermore, in S4, after the ice-covered range of the blades is controlled by adjusting the blade angle α, the laying range of the deicing device is adjusted according to the ice-covered range of the blades.

[0013] Furthermore, in S4, when the ice sensing device detects that the ice coverage is too large and the blades are severely iced to the point where power generation cannot be achieved, the de-icing system is started.

[0014] Furthermore, the ice sensing device adopts an ice sensor.

[0015] Furthermore, the ice sensing device adopts a temperature and humidity sensor.

[0016] Furthermore, the ice sensing device adopts a meteorological warning device.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects: the present invention can control the ice coverage on most of the blade surface within a specific range through blade ice coverage control, which is beneficial to reducing the de-icing range required on the blade surface, simplifying the design of the blade de-icing device, reducing the laying area of ​​the de-icing device, reducing costs, reducing energy waste, facilitating rapid and effective de-icing of wind turbines, and facilitating blade de-icing and rapid resumption of power generation after de-icing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of a wind turbine generator set provided according to an embodiment of the present invention; Figure 2 is a schematic diagram of ice coating on the airfoil surface at different airflow attack angles provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the yaw of a wind turbine provided in an embodiment of the present invention; Figure 4 is a schematic diagram of the angle of attack of the airfoil of a blade cross section provided in an embodiment of the present invention; Figure 5 is an ice coating control flow chart provided according to an embodiment of the present invention.

[0019] The reference numerals include: blade 1, impeller 2. DETAILED DESCRIPTION

[0020] In the following, reference will be made to the Figure 1-5 Embodiments of the present invention are described. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following Figure 1-5 It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0022] When the wind turbine generator set operates in an icing environment, ice will form on the surface of the blade 1. The ice coverage of the airfoil section of the blade 1 changes with the airflow and the angle of attack of the airfoil. The shape of the blade 1 changes after the surface is covered with ice. The shape changes of different blade surfaces after ice is covered are as follows: Figure 2 As shown in a in the middle, the change in shape will lead to a decrease in the aerodynamic performance of the blade, causing a mismatch between the wind speed of the wind turbine and the power generation of the wind turbine set.

[0023] When the wind turbine blade 1 is operating normally, the impeller 2 will change with the wind direction. Figure 3 As shown, Figure 3 The arrow in the figure indicates the wind direction. Figure m shows the impeller 2 before it changes direction with the wind direction, and figure n shows the impeller 2 after it changes direction with the wind direction. At the same time, as the wind speed increases, the rotation speed of the blade 1 increases, so that the angle of attack between the airflow and the blade 1 is always maintained within a certain range.

[0024] Figure 4 In the figure, f1 indicates the rotation direction of the impeller 2, f2 indicates the incoming wind direction, v1 indicates the relative rotation speed, and v2 indicates the airflow speed. Figure 4 As shown in the figure, when the wind power mismatch occurs in the wind turbine, the incoming wind speed remains unchanged, and the speed of the wind turbine decreases, resulting in an increase in the airflow angle β, which will increase the ice-covered area on the surface of the blade 1. And when the wind turbine is shut down and does not change with the wind direction, the impeller 2 rotates freely, resulting in the possibility of ice covering the entire surface of the blade 1, resulting in an increase in the range of deicing required on the surface of the blade 1.

[0025] A method for controlling ice coating on a wind turbine blade in the present invention is as follows: Figure 5 As shown, the ice cover control steps are as follows: S1: First, an icing sensing device is set on the wind turbine to detect the icing condition of the environment and the icing condition of the blade 1, and an environmental icing signal is given when the wind turbine blade 1 is in an icing environment, and an environmental icing command is received. The icing sensing device uses an icing sensor, or a temperature and humidity sensor, or a meteorological warning device.

[0026] S2: It is detected that the wind power mismatch of the unit exceeds the standard.

[0027] S3: Start the ice coating control system of blade 1.

[0028] S4: Adjust the blade angle α of blade 1 in real time.

[0029] Here, when receiving the wind power mismatch signal of the unit, the blade angle α of blade 1 is adjusted so that the angle of attack of each position of the wind turbine blade 1 is always within a specific range, and the blade angle α of blade 1 is adjusted in real time according to the wind speed and the rotation speed of the impeller 2. Specifically, let the airflow angle be β, and the angle of attack be the difference between the airflow angle and the blade angle of wind turbine blade 1, that is, the angle of attack is β-α, and the blade angle α of blade 1 is adjusted. When the airflow angle β increases with the wind power mismatch, the angle of attack β-α is always kept within a specific range, so as to control the ice coverage range of the blade 1 surface within a certain range, reduce the ice coverage range, and reduce the difficulty of deicing.

[0030] At the same time, after controlling the ice coverage of blade 1 by adjusting the blade angle α, the de-icing device is adjusted according to the ice coverage of blade 1. When the ice sensing device detects that the ice coverage is too large and blade 1 is severely iced to the point where it cannot generate electricity, the de-icing system is started and resumed after de-icing is completed.

[0031] S5: The crew receives the command to end the environmental icing.

[0032] S6: Exit the icing control of blade 1.

[0033] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0034] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for controlling ice coating on wind turbine blades, characterized in that: The steps of ice cover control are as follows: S1: Receive the environment freezing command; S2: It is detected that the wind power mismatch of the unit exceeds the standard; S3: starting an ice coating control system for the blade (1); S4: adjusting the blade angle α of the blade (1) in real time; S5: The crew receives the command to end the environmental icing; S6: Exit the ice coating control of the blade (1).

2. The wind turbine blade icing control method according to claim 1, characterized in that: In S1, an icing sensing device is first arranged on the wind turbine to detect the icing condition of the environment and the icing condition of the blades (1), and an environmental icing signal is given when the wind turbine blades (1) are in an icing environment.

3. The wind turbine blade icing control method according to claim 2, characterized in that: In S4, when a wind power mismatch signal of the wind turbine is received, the blade angle α of the blade (1) is adjusted so that the angle of attack of each position of the wind turbine blade (1) is always within a specific range.

4. The wind turbine blade icing control method according to claim 3, characterized in that: The blade angle α of the blade (1) is adjusted in real time according to the wind speed and the impeller speed.

5. The wind turbine blade icing control method according to claim 4, characterized in that: Assuming that the airflow inflow angle is β, the angle of attack is the difference between the airflow inflow angle and the blade angle of the wind turbine blade (1), that is, the angle of attack is β-α; the blade angle α of the blade (1) is adjusted, and when the airflow inflow angle β increases with the mismatch of wind power, the angle of attack β-α is always maintained within a specific range, thereby controlling the ice coverage range of the blade (1) surface within a certain range.

6. The wind turbine blade icing control method according to claim 5, characterized in that: In S4, after the ice-covered range of the blade (1) is controlled by adjusting the blade angle α of the blade (1), the laying range of the deicing device is adjusted according to the ice-covered range of the blade (1).

7. The wind turbine blade icing control method according to claim 6, characterized in that: In S4, when the ice sensing device detects that the ice coverage is too large and the blade (1) is severely iced to the point where it cannot generate electricity, the de-icing system is started.

8. The wind turbine blade icing control method according to claim 7, characterized in that: The ice sensing device adopts an ice sensor.

9. The wind turbine blade icing control method according to claim 7, characterized in that: The ice sensing device uses a temperature and humidity sensor.

10. The wind turbine blade icing control method according to claim 7, characterized in that: The ice sensing device uses meteorological warning equipment.

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