A blade heating power supply control device of a wind turbine anti-freezing disaster system

Abstract

The utility model relates to a kind of blade heating power supply control device of wind turbine anti-freezing disaster system, for solving the problem of blade ice prevention / removal of large-capacity wind turbine in high-humidity low-temperature environment.The device includes 690V and 380V adjustable power supply, 690V power supply is applied to air duct heater after stepless power regulator adjustment, 380V power supply is applied to air blower after frequency converter adjustment, to realize the precise control of blade heating temperature, air flow rate and flow.The device uses integrated box design, centralizes the layout of power control, regulation and communication equipment, simplifies the system structure, reduces equipment load and operation risk, improves the anti-freezing effect, suitable for large-capacity wind turbine with hundred-meter-level and above blades, especially suitable for 5MW and above units, which can effectively ensure the stable operation of wind turbine in severe freezing weather environment.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology, specifically relating to a blade heating power control device for wind turbine anti-freezing disaster system, which is particularly suitable for power control devices that ensure the normal operation of blades in high-humidity and low-temperature environments of large-capacity wind turbines. Background Technology

[0002] When developing wind energy resources in high-humidity and low-temperature areas, wind turbines often encounter freezing disasters, which seriously affect the economic benefits of wind energy resource development.

[0003] In the prior art, utility model patent with publication number CN218407680U relates to this technology, and the device disclosed therein is generally similar to conventional devices currently on the market. The main structure includes: a stress sensor, a first data acquisition unit, an anemometer, a wind vane, a second data acquisition unit, and an industrial control computer. The first data acquisition unit is electrically connected to the stress sensor, the second data acquisition unit is electrically connected to both the anemometer and the wind vane, and the industrial control computer is connected to both the first and second data acquisition units.

[0004] However, existing technologies still have some problems. While the current active gas-heating anti-freezing technology works well for small-capacity units, it has significant shortcomings for large-capacity, low-wind-speed mountain wind farm units. The blade size of large-capacity units has increased dramatically, reaching hundreds of meters or even longer, necessitating optimization and improvement of the blade heating system's technology, equipment selection, and operational control strategies. In existing technologies, the power control of the blade heating system lacks flexibility and precision, making it difficult to meet the heating requirements of large-capacity unit blades. Furthermore, the system structure is complex, and the equipment layout is unreasonable, increasing equipment load and operational safety risks, thus limiting the heating efficiency and operational reliability of large-capacity wind turbine anti-freezing disaster systems. Summary of the Invention

[0005] This utility model aims to provide a blade heating power supply control device suitable for anti-freezing disaster systems of large-capacity wind turbines, which solves the shortcomings of existing blade heating power supply control, realizes precise adjustment of blade heating temperature and air velocity and flow rate, improves anti-freezing effect, and optimizes system structure and equipment layout to reduce operational risks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A blade heating power supply control device for a wind turbine anti-freezing disaster system includes two adjustable power supplies: 690V and 380V.

[0007] 690V adjustable power supply module: It includes a 690V circuit breaker, a stepless power regulator and a duct heater connected in sequence; an external 690V power supply is connected to the 690V circuit breaker through the 690V power supply inlet, and the output of the stepless power regulator is connected to the duct heater through the duct heater power outlet. The stepless power regulator adopts stepless voltage regulation technology, which can realize continuous regulation of 690V power supply. The input terminal of the stepless power regulator is connected to a 690V circuit breaker, and the output terminal is connected to the duct heater via the power output port of the duct heater.

[0008] The 690V adjustable power supply module is applied to the duct heater and controlled by a stepless power regulator to achieve continuous and controllable blade heating temperature. It can precisely adjust the heating power according to changes in ambient temperature to ensure that the blade heating temperature is maintained within a suitable range, effectively preventing ice condensation and accumulation, and meeting the blade anti-icing / de-icing requirements under different operating conditions.

[0009] 380V adjustable power supply module: It includes a 380V circuit breaker, a frequency converter and a blower connected in sequence; an external 380V power supply is connected to the 380V circuit breaker through the 380V power supply inlet, and the output of the frequency converter is connected to the blower through the blower power outlet. The control power switch is connected to a 380V circuit breaker to provide control power for the entire device; the 24V power supply is connected to the control power switch, and its output is connected to the working power supply terminal of the programmable logic controller (PLC) to provide 24V DC power to the PLC; the industrial switch is installed on the back panel, and its output is connected to the communication interfaces of the frequency converter, the stepless power regulator and the PLC via network cables to build an internal communication network. The frequency converter adopts frequency modulation and speed regulation technology, which can adjust the speed of the blower; the input terminal of the frequency converter is connected to a 380V circuit breaker, and the output terminal is connected to the blower through the blower power output port; the programmable logic controller (PLC) serves as the core control unit, is installed on the back panel, and is powered by a 24V power supply. The input terminal of the programmable logic controller (PLC) is connected to an industrial switch to receive instructions and data from an external monitoring platform and a monitoring signal collection device inside the wind turbine hub; the output terminal of the PLC is connected to a frequency converter and a stepless power regulator.

[0010] The 380V adjustable power supply module is applied to the blower, and the airflow rate and volume for blade heating are precisely adjustable and controllable through the frequency converter. By adjusting the blower speed, the airflow rate and volume entering the blade duct are controlled, optimizing the blade heating effect, improving heating efficiency, enhancing the blade's anti-freezing ability, and ensuring stable operation of the blade in low-temperature environments.

[0011] The control and communication module includes a control power switch, a 24V power supply, an industrial switch, a programmable logic controller (PLC), and intermediate relays, all mounted on a backplane.

[0012] The blade heating power control device adopts an integrated box design, which consists of a front door, left side panel, right side panel, top cover, bottom panel and back panel.

[0013] Front door: Equipped with a door lock, it is easy for operators to open and close the door to maintain and repair the internal equipment.

[0014] Left side plate: Equipped with the first radiator to dissipate the heat generated during operation and ensure that the equipment operates within a suitable temperature range; it is also equipped with a surge arrester to prevent damage to the internal electrical components from lightning overvoltage, improve the equipment's lightning resistance, and ensure safe operation.

[0015] Right side panel: Equipped with a second radiator, which works together with the first radiator on the left side panel to enhance the heat dissipation effect of the device and ensure long-term stable operation of the device.

[0016] Top cover: Equipped with a 380V power supply line inlet (i.e., 380V power supply inlet) and a 690V power supply line inlet (i.e., 690V power supply inlet), facilitating the connection of external power lines to the device to provide power support.

[0017] Base plate: It is equipped with a 380V power supply line outlet (i.e., the power outlet of the blower) and a 690V power supply line outlet (i.e., the power outlet of the air duct heater) to deliver the regulated power to the blower and the air duct heater; it is also equipped with network port 1 and network port 2 to realize the network connection between the device and the external monitoring system, so as to meet the needs of data transmission and remote monitoring.

[0018] Backplane: This panel integrates key equipment such as a 380V circuit breaker, frequency converter, 690V circuit breaker, stepless power regulator, control power switch, 24V power supply, industrial switch, programmable logic controller (PLC), and intermediate relays, forming a complete power control and communication system. Specifically, the 380V circuit breaker works with the frequency converter to control the power supply and speed regulation of the blower; the 690V circuit breaker works with the stepless power regulator to regulate the heating power of the duct heater; the control power switch provides control power to the entire unit; the 24V power supply powers the PLC and other equipment; the industrial switch enables communication and interconnection between internal devices and external monitoring systems; the PLC, as the core control unit, coordinates the operation of various devices, executes control logic, and ensures the stable and efficient operation of the blade heating system; and the intermediate relays are used for signal transmission and circuit switching, ensuring the effective execution of control commands. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the unfolded structure of the blade heating power supply control device.

[0020] Figure 2 This is a schematic diagram of the equipment unit layout inside the base plate of the blade heating power supply control device.

[0021] Figure 3 A schematic diagram of the electrical system for wind turbine units to resist freezing disasters.

[0022] Explanation of reference numerals in the attached figures; 1-Front door of blade heating power control device; 2-Front door lock; 3-Top cover of blade heating power control device; 4-380V power supply inlet; 5-690V power supply inlet; 6-Left side plate of blade heating power control device; 7-First radiator; 8-Left side plate surge arrester; 9-Right side plate of blade heating power control device; 10-Second radiator; 11-Bottom plate of blade heating power control device; 12-Blower power outlet; 13-Heater power outlet; 14-Bottom plate network port 1; 15-Bottom plate network port 2; 16-Back plate of blade heating power control device; 17-380V circuit breaker; 18-690V circuit breaker; 19-24V power supply; 20-Control power switch; 21-Industrial switch; 22-Frequency converter; 23-Stepless power regulator; 24-Programmable logic controller (PLC); 25-Intermediate relay. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Furthermore, the elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings: like Figure 1 and Figure 2As shown, the housing of the blade heating power control device 100 is assembled from a front door 1, a left side panel 6, a right side panel 9, a top cover 3 (the top cover 3 is provided with a 690V power inlet 5 and a 380V power inlet 4), a bottom plate 11 (the bottom plate 11 is provided with a duct heater power outlet 13, a blower power outlet 12 and a mesh port), and a back plate 16.

[0026] Left side panel 6: Installed with the first radiator 7 (i.e. the original first radiator 7), with its heat dissipation fins facing outwards, using the principle of air convection to dissipate the heat inside the device; at the same time, equipped with a surge arrester 8, one end of which is connected to the device's internal grounding system, and the other end is connected to the power line. When the lightning impulse voltage exceeds its protection threshold, it quickly conducts and introduces the lightning current into the ground, protecting the device from lightning damage.

[0027] Right side plate 9: It is equipped with a second heat sink 10 (i.e. the original second heat sink 10), which has the same structure as the first heat sink on the left side plate. Together they enhance the overall heat dissipation capacity of the device, ensuring that heat-generating components such as frequency converters and stepless power regulators are in a good heat dissipation environment and ensuring their stable performance.

[0028] Back panel 16: Integrates and installs various key electrical equipment and control units, including a 690V adjustable power supply module 200, a 380V adjustable power supply module 300, and a control and communication module 400; the 690V adjustable power supply module 200 includes a 690V circuit breaker 18, a stepless power regulator 23, and a duct heater 201 connected in sequence; an external 690V power supply is connected to the 690V circuit breaker 18 through the 690V power supply inlet 5, and the output of the stepless power regulator 23 is connected to the duct heater through the duct heater power outlet 13. 201; The 380V adjustable power supply module 300 includes a 380V circuit breaker 17, a frequency converter 22 and a blower 301 connected in sequence; an external 380V power supply is connected to the 380V circuit breaker 17 through the 380V power supply inlet 4, and the output terminal of the frequency converter 22 is connected to the blower 301 through the blower power outlet 12; the control and communication module 400 includes a control power switch 20, a 24V power supply 19, an industrial switch 21, a programmable logic controller (PLC) (24) and an intermediate relay 25, which are installed on the back panel 16.

[0029] The 380V circuit breaker 17 is installed in a suitable location, with its inlet connected to the 380V power supply inlet 4 on the top cover. Its outlet is divided into two paths: one connects to the inlet of the frequency converter 22, providing power input to the frequency converter; the other leads out a 220V power line, connecting to the input of the control power switch 20. The 690V circuit breaker 18 is also installed on the back panel, with its inlet connected to the 690V power supply inlet 5 on the top cover, and its outlet connected to the inlet of the continuously variable power regulator 23, supplying 690V power to the regulator.

[0030] The output of the control power switch 20 is branched into multiple outlets, providing 220V control power to the inverter 22 and the stepless power regulator 23, and also supplying operating power to the 24V power supply 19, surge arrester 8, first heat sink 7, second heat sink 10, and intermediate relay 25. The output of the 24V power supply 19 is connected to the operating power supply of the PLC 24, providing it with 24V DC power for stable operation.

[0031] The industrial switch 21 is installed at a specific location on the back panel. Its input end is connected to the monitoring platform of the 110kV substation of the wind farm via a network cable. The network cable is introduced through the bottom plate network port 1 (14). The output end is connected to the communication interface of the frequency converter 22, the stepless power regulator 23 and the PLC 24 to build an internal communication network for the device and realize data interaction and coordinated control between the devices. On the other hand, it is connected to the monitoring signal collection device in the wind turbine hub through the bottom plate network port 2 (15) via the wind turbine slip ring. The operating data of the blade heating system is transmitted to the monitoring signal collection device in real time and the feedback signal is received to realize accurate monitoring and control of the blade heating status.

[0032] The stepless power regulator 23 adopts stepless voltage regulation technology, which can realize continuous adjustment of the 690V power supply; the input terminal of the stepless power regulator 23 is connected to the 690V circuit breaker 18, and the output terminal is connected to the air duct heater 201 via the power output port 13 of the air duct heater. The frequency converter 22 adopts frequency regulation and speed regulation technology, which can adjust the speed of the blower 301; the input terminal of the frequency converter 22 is connected to the 380V circuit breaker 17, and the output terminal is connected to the blower 301 through the blower power output port 12.

[0033] The programmable logic controller (PLC) 24, as the core control unit, is installed on the back panel 16 and powered by a 24V power supply 19. The input terminal of the PLC 24 is connected to the industrial switch 21 to receive instructions and data from the external monitoring platform and the monitoring signal collection device inside the wind turbine hub. The output terminal of the PLC 24 is connected to the frequency converter 22 and the stepless power regulator 23.

[0034] Example:

[0035] To address the anti-freezing requirements of a 5MW wind turbine unit in a wind farm, the blade heating power supply control device of this utility model is adopted, and the specific implementation is as follows: Power supply connection: A 380V three-phase AC power supply is drawn from the wind turbine nacelle control cabinet. The cable passes through the 380V power supply inlet 4 on the top cover 3 and connects to the 380V circuit breaker 17 on the back panel 16. A 690V three-phase AC power supply is drawn from the high-voltage side of the dry-type transformer at the bottom of the tower. The cable passes through the 690V power supply inlet 5 on the top cover 3 and connects to the 690V circuit breaker 18 on the back panel 16.

[0036] Communication connection: Take two network cables. Connect one end of one network cable to the communication interface of the monitoring platform of the 110kV step-up substation of the wind farm, and pass the other end through network port 1 14 on the base plate 11 to the input port of the industrial switch 21 on the back plate 16. Connect one end of the other network cable to an output port of the industrial switch 21, and pass the other end through network port 2 15 on the base plate 11, and after passing through the wind turbine slip ring, connect to the input port of the monitoring signal collection device inside the wind turbine hub to establish a complete communication link and ensure real-time interaction of monitoring data.

[0037] System Operation: Close the 380V circuit breaker 17 and the 690V circuit breaker 18 to power on the device. Control power switch 20 supplies control power to each device, and 24V power supply 19 powers the programmable logic controller (PLC) 24. The PLC 24 starts operating according to the preset control program. Based on the received instructions from the wind farm monitoring platform and real-time data such as blade temperature and icing status from the monitoring signal collection device inside the wind turbine hub, the PLC sends frequency and speed adjustment commands to the frequency converter 22 to adjust the blower speed and control the airflow speed and volume. Simultaneously, it sends voltage adjustment commands to the stepless power regulator 23 to adjust the heating power of the duct heater, achieving precise control of the blade heating temperature. After receiving the command, the frequency converter 22 adjusts the output frequency and voltage, and leads the regulated 380V power supply out through the blower power outlet 12 on the base plate 11, and transmits it to the blade blower through the fan slip ring to drive the blower to run at the set speed; the stepless power regulator 23 adjusts the output power according to the received voltage regulation signal, and leads the processed 690V power supply out through the duct heater power outlet 13 on the base plate 11, and transmits it to the blade duct heater through the fan slip ring to carry out blade heating operation, effectively resisting the impact of freezing disasters on the operation of the wind turbine, and ensuring the stable and efficient operation of the wind turbine in high humidity and low temperature environment.

[0038] In summary, this utility model solves the key technical problem of large-capacity wind turbines resisting freezing disasters by optimizing the power regulation function and system integration design of the blade heating power control device. It has significant innovation and practicality and can be widely used in wind turbines in mountainous wind farms and other areas prone to freezing, thereby improving the operational reliability and power generation efficiency of wind turbines.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A blade heating power supply control device for a wind turbine anti-freezing disaster system, characterized in that, include: The blade heating power control device (100) consists of a box composed of a front door (1), a left side panel (6), a right side panel (9), a top cover (3), a bottom panel (11), and a back panel (16); the top cover (3) is provided with a 690V power inlet (5) and a 380V power inlet (4); the bottom panel (11) is provided with a duct heater power outlet (13), a blower power outlet (12), and a mesh port; the left side panel (6) is equipped with a first radiator (7) and a surge arrester (8); the right side panel (9) is equipped with a second radiator (10). A 690V adjustable power supply module (200) includes a 690V circuit breaker (18), a stepless power regulator (23), and a duct heater (201) connected in sequence; an external 690V power supply is connected to the 690V circuit breaker (18) through the 690V power supply inlet (5), and the output end of the stepless power regulator (23) is connected to the duct heater (201) through the duct heater power outlet (13). A 380V adjustable power supply module (300) includes a 380V circuit breaker (17), a frequency converter (22), and a blower (301) connected in sequence; an external 380V power supply is connected to the 380V circuit breaker (17) through the 380V power supply inlet (4), and the output terminal of the frequency converter (22) is connected to the blower (301) through the blower power outlet (12); The control and communication module (400), which includes a control power switch (20), a 24V power supply (19), an industrial switch (21), a programmable logic controller (PLC) (24), and an intermediate relay (25), is mounted on a back panel (16).

2. The blade heating power supply control device for the wind turbine anti-freezing disaster system according to claim 1, characterized in that: The control power switch (20) is connected to the 380V circuit breaker (17) to provide control power for the entire device; the 24V power supply (19) is connected to the control power switch (20), and its output terminal is connected to the working power terminal of the programmable controller PLC (24) to provide 24V DC power to the programmable controller PLC (24).

3. The blade heating power supply control device for the wind turbine anti-freezing disaster system according to claim 1, characterized in that: The industrial switch (21) is installed on the back panel (16), and its output is connected to the communication interfaces of the frequency converter (22), the stepless power regulator (23) and the programmable controller (PLC) (24) via network cables to build an internal communication network.

4. The blade heating power supply control device for the wind turbine anti-freezing disaster system according to claim 1, characterized in that: The stepless power regulator (23) adopts stepless voltage regulation technology, which can realize continuous adjustment of 690V power supply; the input end of the stepless power regulator (23) is connected to the 690V circuit breaker (18), and the output end is connected to the air duct heater (201) through the power outlet (13) of the air duct heater.

5. The blade heating power supply control device for the wind turbine anti-freezing disaster system according to claim 1, characterized in that: The frequency converter (22) adopts frequency regulation and speed regulation technology, which can adjust the speed of the blower (301); the input end of the frequency converter (22) is connected to the 380V circuit breaker (17), and the output end is connected to the blower (301) through the blower power outlet (12).

6. The blade heating power supply control device for the wind turbine anti-freezing disaster system according to claim 1, characterized in that: The programmable logic controller (PLC) (24) is the core control unit, installed on the back panel (16), and powered by a 24V power supply (19). The input terminal of the programmable logic controller (PLC) (24) is connected to the industrial switch (21) to receive instructions and data from the external monitoring platform and the monitoring signal collection device inside the wind turbine hub. The output terminal of the programmable logic controller (PLC) (24) is connected to the frequency converter (22) and the stepless power regulator (23).

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