Improved wind driven generator blade electric pulse deicing device

Abstract

The invention relates to the technical field of wind power equipment, in particular to an improved electric pulse deicing device for blades of a wind driven generator. The wind driven generator blade comprises a blade body, a cavity is formed in the blade body, the deicing device comprises a deicing controller, a pulse power source and a plurality of pulse deicing units connected with the pulse power source in parallel, any pulse deicing unit comprises a pulse coil and a metal sheet, and the area of the metal sheet is larger than that of the pulse coil. The pulse coil is connected with a pulse power supply wire, the metal sheet and the pulse coil are fixed in the blade body or on the cavity wall of the cavity, the metal sheet and the pulse coil are oppositely arranged, an opposite surface gap is formed between the metal sheet and the pulse coil, and the multiple groups of pulse deicing units are distributed on the wind driven generator blade at intervals. According to the electric pulse deicing device, an existing electric pulse deicing technology is improved, the structure of the electric pulse deicing device for the wind driven generator blade is simplified, the practicability and safety are improved, meanwhile, the installation cost is reduced, and the purpose of efficient deicing can be achieved while energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power equipment, and in particular to an improved electric pulse deicing device for blades of a wind turbine generator. Background Art

[0002] Wind energy has great development potential as a green, clean and renewable energy source. my country is rich in wind power resources, the wind power industry is developing rapidly, and the total installed capacity is increasing steadily. However, wind turbine blades are prone to freezing in winter, which will change the aerodynamic structure of the blades, causing a decrease in power generation efficiency at the least and causing the wind turbine to shut down at the worst. The blades may even be severely deformed or broken due to uneven load caused by freezing.

[0003] The existing wind turbine blade deicing technologies commonly include heating deicing technology, coating deicing technology and drone deicing technology. However, heating deicing technology has high energy consumption and poor economic efficiency; the hydrophobic coating of coating deicing technology is expensive and easy to fall off; drone deicing technology has low efficiency and complex operation. The existing technologies generally have certain defects that lead to poor deicing effects on wind turbine blades. At present, there is an urgent need for a wind turbine blade deicing technology with simple structure, low energy consumption and strong practicality.

[0004] A wind turbine blade deicing device based on electric pulses (Chinese Patent No. 202111497200.9) discloses an electric pulse deicing method, which generates eddy currents on the metal skin of the wind turbine blades by installing a pulse coil inside the wind turbine blades and applying a large pulse current to the pulse coils. The eddy currents and the pulse coils generate interaction forces, which in turn drive the metal skin to generate micro-amplitude, high-acceleration mechanical vibrations, causing the ice on the surface of the metal skin to vibrate and fall off, thereby achieving the purpose of deicing. However, the technical problem with this patent is that a layer of metal skin must be laid on the surface of the wind turbine blade, and the existing wind turbine blades are generally made of fiberglass, which is a low-weight, high-strength non-metallic material. If a layer of metal skin is laid on the outside of the existing wind turbine blade, firstly, the weight of the wind turbine blade will be greatly increased, affecting the working efficiency of the generator set and the service life of the wind turbine blade; secondly, after the wind turbine blade is laid with the metal skin, due to the different thermal expansion coefficients of the metal skin and the non-metallic material, gaps are likely to appear between the metal skin and the non-metallic blade material, resulting in changes in the shape of the blade, and then changing the aerodynamic performance, reducing the wind energy capture capability, and thus reducing the power generation efficiency, and even causing the metal skin to fall off; finally, the outer metal skin will greatly increase the risk of the entire wind turbine generator set being struck by lightning, and there is a high safety risk.

[0005] To sum up, the wind turbine blade deicing technology disclosed in a wind turbine blade deicing device based on electric pulses (patent number 202111497200.9) is difficult to be effectively promoted in practical applications. Summary of the invention

[0006] Based on the above, the purpose of the present invention is to improve the existing wind turbine blade deicing technology and provide an improved wind turbine blade electric pulse deicing device to achieve efficient and practical wind turbine blade deicing.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An improved electric pulse deicing device for wind turbine blades, the wind turbine blades comprising a blade body, the blade body having a cavity therein, characterized in that the deicing device comprises a deicing controller, a pulse power supply and a plurality of groups of pulse deicing units connected in parallel with the pulse power supply, any group of the pulse deicing units comprises a pulse coil and a metal sheet, the pulse coil is connected to the pulse power supply wire, the metal sheet and the pulse coil are fixed in the blade body or on the wall of the cavity, the metal sheet and the pulse coil are arranged opposite to each other and there is a gap between the relative surfaces.

[0009] As a preferred solution of an improved electric pulse deicing device for wind turbine blades, the plurality of groups of pulse deicing units are distributed at intervals on the wind turbine blades.

[0010] As a preferred solution for an improved electric pulse deicing device for wind turbine blades, the center lines of the metal sheet and the pulse coil of any group of pulse deicing units coincide, and the pulse coil and the metal sheet are both thin sheet structures that fit the wind turbine blades.

[0011] As a preferred solution for an improved electric pulse deicing device for wind turbine blades, the pulse coil is a spiral ring coil, and the metal sheet is a metal disc having an area larger than that of the pulse coil.

[0012] As a preferred solution for an improved electric pulse deicing device for wind turbine blades, the pulse power supply includes a step-up transformer, a current limiting resistor, a charging switch, a capacitor and a clamping diode. The step-up transformer is connected to the capacitor via the current limiting resistor and the charging switch to form a loop, and the capacitor is connected in parallel with the clamping diode.

[0013] As a preferred solution of an improved electric pulse deicing device for wind turbine blades, the pulse coils of any group of the pulse deicing units are connected in parallel with the pulse power supply.

[0014] As a preferred solution for an improved electric pulse deicing device for wind turbine blades, the pulse coils in a plurality of groups of pulse deicing units may be first connected in series and then connected in parallel with the pulse power supply to form a loop.

[0015] As a preferred solution of an improved electric pulse deicing device for wind turbine blades, a discharge switch is provided between the pulse coil and the pulse power supply.

[0016] As a preferred solution for an improved electric pulse deicing device for wind turbine blades, the deicing device also includes an ice sensor, and the deicing controller is communicatively connected to the charging switch, the discharging switch, the temperature sensor and the ice sensor respectively, and the deicing controller controls the on or off of the charging switch and the discharging switch according to the temperature signal collected by the temperature sensor or the ice signal collected by the ice sensor.

[0017] As a preferred solution of an improved electric pulse deicing device for wind turbine blades, the wind turbine blade also includes a hub compartment connected to the blade body, the temperature sensor is arranged outside the hub compartment, the pulse power supply, the discharge switch and the deicing controller are arranged inside the hub compartment, and the icing sensor is arranged on the surface of the blade body.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention improves the existing electric pulse deicing technology, simplifies the structure of the electric pulse deicing device for wind turbine blades, improves practicality and safety, and reduces installation costs.

[0020] 2. The present invention uses electric pulse deicing to save energy and achieve the purpose of efficient deicing.

[0021] 3. The step-up transformer of the present invention can adopt an ordinary iron core transformer, which has good insulation performance and high reliability, and can achieve an average trouble-free service life of 20 years, thereby minimizing the failure rate and operation and maintenance cost of the wind turbine blade deicing system. In addition, since the charging current does not need to be too large and there is no special requirement for the charging time, it only needs to be fully charged within tens to hundreds of seconds, so the step-up transformer can adopt a low-power and small-volume product, which is convenient for the installation of the deicing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of an improved electric pulse deicing device for wind turbine blades provided by the present invention;

[0024] Figure 2-a It is an enlarged schematic diagram of a spiral annular flat coil of an improved electric pulse deicing device for wind turbine blades provided by the present invention;

[0025] Figure 2-b It is an enlarged schematic diagram of a spiral annular vertical coil of an improved electric pulse deicing device for wind turbine blades provided by the present invention;

[0026] Figure 3 yes Figure 1 A schematic diagram of a partially enlarged structure of a medium pulse deicing unit 4;

[0027] Figure 4 It is a circuit schematic diagram of an improved electric pulse deicing device for wind turbine blades provided by the present invention;

[0028] Figure 5 It is a schematic diagram of adjacent group circuits of an improved electric pulse deicing device for wind turbine blades provided by the present invention;

[0029] Figure 6 The present invention provides an improved electric pulse deicing device for wind turbine blades, which is a schematic diagram of the electric pulse deicing principle.

[0030] Reference numerals:

[0031] 1-blade body; 2-cavity; 3-hub compartment; 4-pulse deicing unit; 41-metal sheet; 42-pulse coil; 5-circuit wire; 6-pulse power supply; 61-step-up transformer T1; 62-current limiting resistor R1; 63-charging switch Q0; 64-capacitor C1; 65-clamping diode D1; 7-deicing controller; 8-discharge switch Q, Q1, Q2 and Q3 in the attached figure are all discharge switch Q; 9-temperature sensor; 10-icing sensor; 11-Internet of Things transceiver module; 12-Internet of Things icing sensor. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between 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.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] This embodiment provides an improved electric pulse deicing device for wind turbine blades, such as Figure 1As shown, the wind turbine blade includes a blade body 1 and a hub cabin 3, the blade body 1 has a cavity 2, and the deicing device includes multiple groups of pulse deicing units 4, circuit conductors 5, pulse power supplies 6 and deicing controllers 7. Any group of pulse deicing units 4 also includes a metal sheet 41 and a pulse coil 42. Multiple groups of pulse deicing units 4 are distributed on each blade body 1 at intervals. The metal sheet 41 and the pulse coil 42 are fixed in the blade body 1 or on the cavity wall of the cavity 2 by an integrated molding processing method. The metal sheet 41 and the pulse coil 42 are arranged opposite to each other, the center lines coincide, and there is a relative surface gap. The relative surface gap refers to a small gap between the two planes opposite to the metal sheet 41 and the pulse coil 42. The metal sheet 41 and the pulse coil 42 generate an induced magnetic field and a pulse force through the relative surface gap, thereby driving the blade body 1 to generate a small amplitude and high acceleration attenuation vibration, so that the ice layer on the surface of the blade body 1 is peeled off, crushed and falls off, so as to achieve the purpose of deicing. The specific spacing value of the relative surface gap is designed according to the actual situation.

[0037] For example, the metal sheet 41 and the pulse coil 42 can be fixed inside the blade body 1, or fixed on the cavity wall of the cavity 2, or can be fixed on the blade body 1. Figure 1 and Figure 3 The metal sheet 41 shown is fixed inside the blade body 1, and the pulse coil 42 is partially fixed on the wall of the cavity 2. As long as the prerequisite that the metal sheet 41 and the pulse coil 42 are arranged opposite to each other and there is a relative surface gap is met, the specific installation method of the metal sheet 41 and the pulse coil 42 can be flexibly selected according to actual conditions to ensure that the metal sheet 41 and the pulse coil 42 can generate an induced magnetic field and pulse force through the relative surface gap while achieving a good fixing effect.

[0038] Specifically, Figure 2-a , Figure 2-b and Figure 3 As shown, the pulse coil 42 is a spiral ring coil, and the winding method of the spiral ring coil can be a flat winding method (refer to Figure 2-a ) or vertical winding (reference Figure 2-b ), both winding methods can meet the normal working requirements of the deicing device. The actual winding method is selected according to the actual situation. In this embodiment, a spiral ring flat coil is used for explanation. The metal sheet 41 is a metal disc with an area slightly larger than that of the pulse coil 42. The metal sheet 41 and the pulse coil 42 are thin sheet structures that fit the blade body 1, and the thickness of the metal sheet 41 is slightly thinner than that of the pulse coil 42, so as not to change the outer contour of the blade body 1, and thus not to affect the aerodynamic performance of the blade body 1. The specific values ​​of the thickness of the metal sheet 41 and the pulse coil 42 and the number of turns of the pulse coil 42 are comprehensively designed according to the size of the wind turbine blade and the deicing power requirements.

[0039] Furthermore, any pulse coil 42 is connected in parallel to the pulse power supply 6 through the circuit conductor 5. The circuit conductor 5 can be embedded in the blade body 1 by an integrated molding process, or can be closely attached to the cavity wall of the cavity 2. The specific setting method is selected according to the actual situation. The pulse power supply 6 and the deicing controller 7 are arranged inside the hub cabin 3 of the wind turbine. The deicing controller 7 is preset with a deicing program, a signal processing module, and a timing control module.

[0040] In some specific embodiments, Figure 1 and Figure 4 As shown, the pulse power supply 6 includes a step-up transformer T1, a current limiting resistor R1, a charging switch Q0, a capacitor C1 and a clamping diode D1. The step-up transformer T1 is connected to the capacitor C1 through the current limiting resistor R1 and the charging switch Q0 to form a loop to supply power to the capacitor C1. The capacitor C1 is connected in parallel with the clamping diode D1. The pulse coil 42 of any group of pulse deicing units 4 is connected in parallel with the pulse power supply 6. A discharge switch Q is provided between any pulse coil 42 and the pulse power supply 6. The discharge switch Q is also provided inside the hub compartment 3 of the wind turbine. The discharge switch Q is used to control the power supply of the corresponding pulse coil 42. The discharge switch Q and the charging switch Q0 are both composed of thyristors. The deicing controller 7 is respectively connected to the discharge switch Q, the charging switch Q0 and the temperature sensor 9 outside the hub compartment 3 in communication. The deicing controller 7 controls the conduction or disconnection of the discharge switch Q and the charging switch Q0 according to the external temperature signal received by the temperature sensor 9. Figure 4 and Figure 5 Q1, Q2 and Q3 are all discharge switches Q. In this embodiment, there are three branches formed by the discharge switch Q and the pulse coil 42. In actual applications, there can be multiple branches, such as 2, 4 or 5.

[0041] Optionally, refer again to Figure 1 and Figure 4 An ice sensor 10 is also provided on the surface of the blade body 1. The ice sensor 10 is communicatively connected with the de-icing controller 7. The ice sensor 10 is used to detect whether the surface of the blade body 1 is frozen. When ice forms on the surface of the blade body 1, the ice sensor 10 sends an ice signal to the de-icing controller 7, and the de-icing controller 7 then controls the de-icing device to perform de-icing.

[0042] Optionally, an Internet of Things transceiver module 11 is provided in the hub compartment 3, and an Internet of Things icing sensor 12 is also provided on the surface of the blade body 1. The Internet of Things icing sensor 12 is connected to the Internet of Things transceiver module 11 in communication, and the Internet of Things transceiver module 11 is connected to the deicing controller 7 in communication. The Internet of Things transceiver module 11 is also connected to the remote device in communication. The icing sensor 10 is used to detect whether the surface of the blade body 1 is frozen. When the surface of the blade body 1 is frozen, the Internet of Things icing sensor 12 sends an icing signal to the Internet of Things transceiver module 11. The remote device can query the icing signal received by the Internet of Things transceiver module 11, and manually control the Internet of Things transceiver module 11 to send a deicing instruction to the deicing controller 7, and the deicing controller 7 controls the deicing device to deicing. It can be understood that the temperature sensor 9, the icing sensor 10 and the Internet of Things icing sensor 12 are selectively installed and set based on the actual application requirements of the wind turbine, the on-site working conditions and the project cost.

[0043] In some specific embodiments, a power supply is configured in the hub compartment 3 of the wind turbine, and the power supply supplies power to the step-up transformer T1, the de-icing controller 7 and the Internet of Things transceiver module 11. The step-up transformer T1 steps up the input 220V or 380V alternating current (AC) to 500V~1000V, and then the de-icing controller 7 turns on the charging switch Q0 to charge the capacitor C1. In order to prevent the voltage at the capacitor C1 end from being too low in the initial stage of charging, resulting in excessive charging current, a current limiting resistor R1 is set for current limiting in the initial stage of charging. Since the charging switch Q0 is a unidirectional thyristor, there is no need to set a rectifier circuit at the output end of the step-up transformer T1.

[0044] In some specific embodiments, the pulse coils 42 in the multiple pulse deicing units 4 can be connected in series first, and then connected in parallel with the pulse power supply 6 to form a loop. This design can reduce the number of wiring of the circuit conductors 5, reduce costs, and reduce the weight of the blade body 1, thereby improving safety. The specific number of series-connected groups of the multiple pulse coils 42 is designed according to actual conditions, and can be two groups, three groups, four groups, etc. This design also needs to increase the charging voltage of the capacitor C1 accordingly, and select a capacitor C1 with a higher withstand voltage and a larger capacity, so as to keep the pulse current of any pulse coil 42 unchanged. For example, Figure 5As shown, the pulse coils 42 in two adjacent groups of pulse deicing units 4 are first connected in series to form adjacent groups, and then multiple adjacent groups are connected in parallel with the pulse power supply 6 to form a loop. In this case, the charging voltage of the capacitor C1 needs to be doubled accordingly. For example: if any pulse coil 42 is directly connected in parallel with the pulse power supply 6, the capacitor C1 needs to be charged to a voltage of 500V; if two adjacent pulse coils 42 are connected in series to form an adjacent group, and then directly connected in parallel with the pulse power supply 6, the capacitor C1 needs to be charged to a voltage of 1000V. If the adjacent group is composed of three groups of pulse coils 42 connected in series, the capacitor C1 needs to be charged to a voltage of 1500V, and so on for other situations.

[0045] In some specific embodiments, the deicing methods of the electric pulse deicing device for wind turbine blades are automatic deicing and manual deicing. The power supply in the hub compartment 3 of the wind turbine supplies power to the step-up transformer T1, the deicing controller 7 and the Internet of Things transceiver module 11. When the temperature sensor 9 detects that the external temperature is less than or equal to 0°C or the ice sensor 10 and the Internet of Things ice sensor 12 detect an ice signal, the deicing controller 7 starts according to the received signal: when the temperature signal received from the temperature sensor 9 shows that the external temperature is less than or equal to 0°C, the timing control module of the deicing controller 7 starts and wakes up the deicing program at a preset time interval to perform automatic deicing; when the ice signal of the ice sensor 10 is received, the deicing controller 7 controls the deicing device to perform automatic deicing; when the remote device queries the Internet of Things transceiver module 11 and receives the ice signal, the Internet of Things transceiver module 11 is manually controlled to send a deicing instruction to the deicing controller 7, and the deicing controller 7 then starts deicing to achieve manual deicing.

[0046] The specific steps include:

[0047] Step 1: The power supply in the wheel hub compartment 3 supplies power to the de-icing controller 7 and the Internet of Things transceiver module 11;

[0048] Step 2-1: Set the deicing interval of the deicing controller 7 and start the timed deicing. When the cabin temperature sensor detects that the external temperature is less than or equal to 0°C, the timing control module of the deicing controller 7 starts and wakes up the deicing program at a preset time interval to start automatic deicing;

[0049] Step 2-2: When the ice sensor 10 detects ice formation on the surface of the blade body 1, the ice sensor 10 sends an ice signal to the de-icing controller 7, and the de-icing controller 7 starts automatic de-icing;

[0050] Step 2-3: When the IoT icing sensor 12 detects icing on the surface of the blade body 1, the IoT icing sensor 12 sends an icing signal to the IoT transceiver module 11, the remote device queries the IoT transceiver module 11, receives the icing signal, and manually controls the IoT transceiver module 11 to send a deicing command to the deicing controller 7, and the deicing controller 7 then starts deicing;

[0051] Step 3: Under the action of the de-icing controller 7, the charging switch Q0 is turned on, and the power supply in the hub compartment 3 inputs 220V or 380V alternating current (AC) to the step-up transformer T1;

[0052] Step 4: The step-up transformer T1 steps up the input voltage to 500-1000V, and charges the capacitor C1 through the charging switch Q0 through the protection of the current limiting resistor R1;

[0053] Step 5: After charging is completed, the de-icing controller 7 controls the charging switch Q0 to turn off, and controls the discharge switch Q corresponding to the pulse coil 42 to turn on;

[0054] Step 6: The capacitor C1 discharges instantaneously to the pulse coil 42, such as Figure 6 As shown, a rapidly formed and rapidly decaying induced magnetic field is established around the metal sheet 41 and the pulse coil 42. Under the action of the induced magnetic field, a pulse force of sub-millisecond level with an acceleration of up to 100g and a magnitude of hundreds to thousands of Newtons is generated between the metal sheet 41 and the pulse coil 42. The pulse force is in opposite directions. The metal sheet 41 and the pulse coil 42 drive the blade body 1 to generate a decaying vibration with a small amplitude and high acceleration, so that the ice layer on the surface of the blade body 1 is peeled off, crushed and falls off, thereby achieving the purpose of deicing.

[0055] Step 7: When the cabin temperature sensor detects that the external temperature is greater than 0°C or the icing sensor 10 and the IoT icing sensor 12 detect no icing signal, the deicing controller 7 controls the discharge switch Q and the charging switch Q0 to turn off, and the deicing action ends.

[0056] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the technical field not disclosed in the present disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0057] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An improved electric pulse deicing device for wind turbine blades, the wind turbine blades comprising a blade body, the blade body having a cavity, characterized in that: The deicing device includes a deicing controller, a pulse power supply and multiple groups of pulse deicing units connected in parallel with the pulse power supply. Any group of the pulse deicing units includes a pulse coil and a metal sheet. The pulse coil is connected to the pulse power supply wire. The metal sheet and the pulse coil are fixed in the blade body or on the cavity wall of the cavity. The metal sheet and the pulse coil are arranged opposite to each other and there is a gap between the relative surfaces.

2. An improved electric pulse deicing device for wind turbine blades according to claim 1, characterized in that: The plurality of groups of pulse deicing units are distributed at intervals on the wind turbine blades.

3. An improved electric pulse deicing device for wind turbine blades according to claim 2, characterized in that: The center lines of the metal sheet and the pulse coil of any group of the pulse deicing units coincide with each other, and both the pulse coil and the metal sheet are thin sheet structures that fit the blades of the wind turbine generator.

4. The wind turbine blade deicing device based on electric pulse according to claim 2, characterized in that: The pulse coil is a spiral ring coil, and the metal sheet is a metal disc with an area larger than that of the pulse coil.

5. The improved electric pulse deicing device for wind turbine blades according to claim 1, characterized in that: The pulse power supply includes a boost transformer, a current limiting resistor, a charging switch, a capacitor and a clamping diode. The boost transformer is connected to the capacitor via the current limiting resistor and the charging switch to form a loop. The capacitor is connected in parallel with the clamping diode.

6. An improved electric pulse deicing device for wind turbine blades according to claim 5, characterized in that: The pulse coils of any group of the pulse deicing units are connected in parallel with the pulse power supply.

7. An improved electric pulse deicing device for wind turbine blades according to claim 6, characterized in that: The pulse coils in the plurality of groups of pulse deicing units may be connected in series first, and then connected in parallel with the pulse power supply to form a loop.

8. An improved electric pulse deicing device for wind turbine blades according to claim 7, characterized in that: A discharge switch is arranged between the pulse coil and the pulse power supply.

9. An improved electric pulse deicing device for wind turbine blades according to claim 8, characterized in that: The deicing device also includes a temperature sensor and an ice sensor. The deicing controller is communicatively connected to the charging switch, the discharging switch, the temperature sensor and the ice sensor respectively. The deicing controller controls the on or off of the charging switch and the discharging switch according to the temperature signal collected by the temperature sensor or the ice signal collected by the ice sensor.

10. An improved electric pulse deicing device for wind turbine blades according to claim 9, characterized in that: The wind turbine blade also includes a hub cabin connected to the blade body, the temperature sensor is arranged outside the hub cabin, the pulse power supply, the discharge switch and the de-icing controller are arranged inside the hub cabin, and the icing sensor is arranged on the surface of the blade body.

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