Wind turbine blade de-icing system based on pulse de-icing

Abstract

The application provides a wind turbine blade deicing system based on pulse deicing, which comprises a detection module, a deicing module and a deicing control module; the deicing module comprises an excitation coil and a skin, the excitation coil is attached to a deicing point of a fan blade, the skin is fixed to the surface of the fan blade at the deicing point and covers the excitation coil completely; the deicing control module comprises a control unit and an excitation driving unit; the control unit is used for receiving an ice coating detection signal output by the detection module and judging the ice coating thickness, and controlling the excitation driving unit to work according to the ice coating thickness, so as to output an excitation pulse to the corresponding excitation coil.

Description

TECHNICAL FIELD

[0001] The present application relates to a power deicing system, in particular to a wind turbine blade deicing system based on pulse deicing. BACKGROUND

[0002] When the wind turbine is erected in high altitude area, it inevitably faces the problem of blade icing. When the blade icing occurs, its aerodynamic performance is affected, thereby reducing the power generation and efficiency of the wind turbine, and in severe cases, it may even cause the wind turbine to fail or stop running.

[0003] There are generally two ways to deice the wind turbine blade, one is electric heating deicing, and the other is vibration deicing. The electric heating deicing method has the problem of high energy consumption, and its economy is poor. The vibration deicing in the prior art is difficult to effectively remove the ice on the blade, that is, the vibration deicing often has ice residues, thereby still affecting the operation of the wind turbine.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a wind turbine blade deicing system based on pulse deicing, which generates eddy current on the skin through electric pulse, thereby generating mechanical vibration, and removes the ice on the wind turbine blade through the mechanical vibration. The present application can effectively and completely remove the ice on the blade without affecting the power generation performance of the wind turbine, reduce the mechanical load of the wind turbine blade, and ensure the efficiency and stability of the wind turbine power generation in winter.

[0006] The present application provides a wind turbine blade deicing system based on pulse deicing, which comprises a detection module, a deicing module and a deicing control module.

[0007] The deicing module comprises an excitation coil and a skin, the excitation coil is attached to the deicing point of the wind turbine blade, and the skin is fixed to the surface of the wind turbine blade at the deicing point and covers the excitation coil.

[0008] The deicing control module comprises a control unit and an excitation driving unit.

[0009] The control unit is used for receiving the ice thickness detection signal output by the detection module and judging the ice thickness, and controlling the excitation driving unit to work according to the ice thickness, thereby outputting excitation pulse to the corresponding excitation coil.

[0010] Further, the control unit controls the excitation driving unit to act according to the ice thickness, which specifically comprises:

[0011] The control unit calculates the ice thickness of each deicing point according to the detection signal.

[0012] The ice thicknesses of the respective ice melting points are sorted in ascending order;

[0013] The control unit controls the corresponding excitation driving units in sequence according to the ice thickness sequence as the ice melting action priority sequence.

[0014] Further, the excitation unit comprises a voltage doubling circuit, an energy storage charging circuit and an excitation coil control circuit;

[0015] The input end of the voltage doubling circuit is connected to a power supply, the output end of the voltage doubling circuit is connected to the input end of the energy storage charging circuit, the output end of the energy storage charging circuit is connected to the excitation coil control circuit, the excitation coil control circuit supplies power to the excitation coil, and the control input ends of the energy storage charging circuit and the excitation coil control circuit are connected to the control unit.

[0016] Further, the energy storage charging circuit comprises an electronic switch Q1, a resistor R1 and a capacitor CR;

[0017] The input end of the electronic switch Q1 is connected to the output end of the voltage doubling circuit, the output end of the electronic switch Q1 is connected to the ground through the resistor R1 and the capacitor CR in series, the common connection point between the resistor R1 and the capacitor CR serves as the output end of the energy storage charging circuit, and the control end of the electronic switch Q1 is connected to the control unit.

[0018] Further, the excitation coil control circuit comprises an electronic switch Q2 and a resistor R2;

[0019] The input end of the electronic switch Q2 is connected to the output end of the energy storage charging circuit, the output end of the electronic switch Q2 is connected to one end of the resistor R2 through the excitation coil L1, the other end of the resistor R2 is connected to the ground, and the control end of the electronic switch Q2 is connected to the control unit.

[0020] Further, the excitation coil of each ice melting point is input with excitation current at least twice, and after all ice melting actions of the ice melting point with high priority are completed, ice melting actions are performed on the ice melting point with the next priority.

[0021] Further, the input voltage of the excitation coil of each ice melting point in the last ice melting action is lower than that in the previous ice melting action, and the excitation coil ice melting action voltage is determined by the following formula:

[0022] Wherein, t is the charging time of the capacitor CR, V max is the maximum voltage output by the voltage doubling circuit, and RC is a time coefficient.

[0023] The application has the advantages that: the present application generates vortex on the skin by means of electric pulse, and then generates mechanical vibration, which removes the icing on the fan blade, effectively and completely removes the icing on the blade without affecting the performance of the wind turbine, reduces the mechanical load of the fan blade, and ensures the efficiency and stability of the wind turbine in winter. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application will be further described below in combination with the drawings and examples:

[0025] Figure 1 The figure is a schematic diagram of the deicing point arrangement structure in the application.

[0026] Figure 2 The figure is a schematic diagram of the voltage doubler circuit structure in the application.

[0027] Figure 3 The figure is a schematic diagram of the energy storage charging circuit structure in the application.

[0028] Figure 4 The figure is a schematic diagram of the excitation coil control circuit structure in the application.

[0029] Figure 5 The figure is a schematic diagram of the electrical structure in the application. DETAILED DESCRIPTION

[0030] The application will be further described below in combination with the drawings and examples:

[0031] The application provides a wind turbine blade deicing system based on pulse deicing, which comprises a detection module, a deicing module and a deicing control module.

[0032] The deicing module comprises an excitation coil and a skin, the excitation coil is attached to the deicing point of the fan blade, the skin is fixed to the surface of the fan blade at the deicing point and covers the excitation coil together with the skin; as shown in the figure, Figure 1 Figure 1 The circle represents the deicing point, the distance between the adjacent two deicing points is set to 1 meter, and the distance between the deicing point and the edge of the blade windward surface is set to 0.5 meters, which is more conducive to deicing.

[0033] The deicing control module comprises a control unit and an excitation driving unit.

[0034] ​The control unit is used for receiving the icing detection signal output by the detection module and judging the icing thickness, and controlling the excitation driving unit to work according to the icing thickness, so as to output the excitation pulse to the corresponding excitation coil. Wherein, the control unit adopts the existing single-chip microcomputer, the detection module adopts the existing camera, and the icing thickness of each deicing point of the fan blade is estimated by using the existing algorithm through the obtained blade image information, which is not described here. Through the above structure, the skin generates eddy current through the electric pulse, and then generates mechanical vibration, which removes the icing of the fan blade through the mechanical vibration. The icing on the blade can be effectively and completely removed without affecting the power generation performance of the wind turbine, reducing the mechanical load of the fan blade, and ensuring the efficiency and stability of the wind turbine in winter.

[0035] Wherein, the skin can be made of aluminum material, which has relatively small mass and can reduce the load on the blade. The skin is fixed on the surface of the fan blade by rivets.

[0036] In the embodiment, the control unit controls the excitation driving unit to act according to the icing thickness, which specifically includes:

[0037] The control unit calculates the icing thickness of each deicing point according to the detection signal;

[0038] The icing thickness of each deicing point is sorted from small to large;

[0039] The control unit controls the corresponding excitation driving unit to work in turn according to the icing thickness sequence as the deicing action priority sequence. The thicker the icing thickness, the stronger the adhesion between the icing and the surface of the blade. Therefore, deicing is first performed at the position with smaller icing thickness, which can damage the ice layer and gradually reduce the adhesion between the icing in the area with thicker icing and the blade, thereby facilitating the removal of the icing.

[0040] In the embodiment, the excitation unit includes a voltage doubling circuit, an energy storage charging circuit and an excitation coil control circuit;

[0041] The input end of the voltage doubling circuit is connected with the power supply, the output end of the voltage doubling circuit is connected with the input end of the energy storage charging circuit, the output end of the energy storage charging circuit is connected with the excitation coil control circuit, and the excitation coil control circuit supplies power to the excitation coil. The control input ends of the energy storage charging circuit and the excitation coil control circuit are connected with the control unit. Wherein, the control unit adopts the existing single-chip microcomputer, which is not described here.

[0042] Specifically, the energy storage charging circuit includes an electronic switch Q1, a resistor R1 and a capacitor CR;

[0043] The input end of the electronic switch Q1 is connected to the output end of the voltage doubling circuit, the output end of the electronic switch Q1 is connected to the ground through the series connection of the resistor R1 and the capacitor CR, the common connection point between the resistor R1 and the capacitor CR is the output end of the energy storage charging circuit, and the control end of the electronic switch Q1 is connected to the control unit.

[0044] The excitation coil control circuit comprises an electronic switch Q2 and a resistor R2.

[0045] The input end of the electronic switch Q2 is connected to the output end of the energy storage charging circuit, the output end of the electronic switch Q2 is connected to one end of the resistor R2 through the excitation coil L1, the other end of the resistor R2 is connected to the ground, and the control end of the electronic switch Q2 is connected to the control unit. The electronic switch can be realized by using an existing NMOS switch, a transistor and the like. The conduction and turn-off of Q2 and Q1 are as follows: when Cr is charged, Q1 is turned on, Q2 is turned off, after Cr is fully charged, Q1 is turned off, Q2 is turned on, and the control signal of Q2 is a PWM signal, so that pulse discharge is performed, and after Cr is discharged, the next time interval for charging the capacitor Cr of the current deicing point is at least the time required for heat dissipation of the excitation coil.

[0046] In the embodiment, the excitation coil of each deicing point is input with excitation current at least twice, and after all deicing actions of the deicing point with high priority are completed, deicing actions are performed on the deicing point with the next priority. Generally, the deicing point needs to perform deicing actions four times, that is, the capacitor is charged and discharged four times, and then deicing actions are performed on the next deicing point. Through the above, the ice on the fan blade can be removed more thoroughly.

[0047] In the embodiment, the input voltage of the excitation coil of each deicing point in the last deicing action is lower than the voltage in the previous deicing action, and the deicing action voltage of the excitation coil is determined by the following formula:

[0048] Wherein, t is the charging time of the capacitor CR, V max is the maximum voltage output by the voltage doubling circuit, and RC is a time coefficient. In this way, the mechanical vibration generated by the excitation pulse has sufficient destructive power, and energy consumption can also be saved to a certain extent.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A wind turbine blade de-icing system based on pulse de-icing, characterized in that: It includes a detection module, a de-icing module, and a de-icing control module; The de-icing module includes an excitation coil and a skin. The excitation coil is attached to a de-icing point set on the wind turbine blade, and the skin is fixed to the surface of the wind turbine blade at the de-icing point and the skin completely covers the excitation coil. The de-icing control module includes a control unit and an excitation drive unit; The control unit is used to receive the icing detection signal output by the detection module and determine the icing thickness, and control the excitation drive unit to work according to the icing thickness, thereby outputting excitation pulses to the corresponding excitation coil. The control unit controls the operation of the excitation drive unit based on the ice thickness, specifically including: The control unit calculates the ice thickness at each de-icing point based on the detection signal; Sort the ice thickness at each de-icing point from smallest to largest; The control unit uses the ice thickness sequence as the priority sequence for de-icing actions to sequentially control the corresponding excitation drive units to work. The excitation drive unit includes a voltage multiplier circuit, an energy storage and charging circuit, and an excitation coil control circuit. The input terminal of the voltage multiplier circuit is connected to the power supply, the output terminal of the voltage multiplier circuit is connected to the input terminal of the energy storage charging circuit, the output terminal of the energy storage charging circuit is connected to the excitation coil control circuit, and the excitation coil control circuit supplies power to the excitation coil; the control input terminals of the energy storage charging circuit and the excitation coil control circuit are connected to the control unit.

2. The wind turbine blade de-icing system based on pulse de-icing according to claim 1, characterized in that: The energy storage and charging circuit includes an electronic switch Q1, a resistor R1, and a capacitor CR. The input terminal of electronic switch Q1 is connected to the output terminal of the voltage multiplier circuit. The output terminal of electronic switch Q1 is grounded through a series connection of resistor R1 and capacitor CR. The common connection point between resistor R1 and capacitor CR serves as the output terminal of the energy storage charging circuit. The control terminal of electronic switch Q1 is connected to the control unit.

3. The wind turbine blade de-icing system based on pulse de-icing according to claim 2, characterized in that: The excitation coil control circuit includes electronic switch Q2 and resistor R2; The input terminal of electronic switch Q2 is connected to the output terminal of the energy storage and charging circuit. The output terminal of electronic switch Q2 is connected to one end of resistor R2 through excitation coil L1. The other end of resistor R2 is grounded. The control terminal of electronic switch Q2 is connected to the control unit.

4. The wind turbine blade de-icing system based on pulse de-icing according to claim 2, characterized in that: The excitation coil of each de-icing point is input with excitation current at least twice, and the de-icing action is performed on the next priority de-icing point only after all the de-icing actions of the higher priority de-icing point have been completed.

5. The wind turbine blade de-icing system based on pulse de-icing according to claim 4, characterized in that: The input voltage of the excitation coil at each de-icing point for the subsequent de-icing action is lower than the voltage of the previous de-icing action, and the de-icing action voltage of the excitation coil is determined by the following formula: Where t is the charging time of capacitor CR, RC represents the maximum output voltage of the voltage multiplier circuit, and RC is the time coefficient.

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