An AC pitch control device

Abstract

This utility model discloses an AC pitch control device, comprising three shaft control cabinets, one central control cabinet, and three battery cabinets. Each of the three shaft control cabinets houses three integrated AC drives, all electrically connected to the nacelle main controller. Each integrated AC drive integrates a pitch controller, a pitch driver, and a capacitor charger. The central control cabinet contains a first connection line and a second connection line. Each of the three battery cabinets houses three sets of supercapacitor modules, each electrically connected to one of the three integrated AC drives. Each of the three integrated AC drives is electrically connected to three AC permanent magnet synchronous motors. In this utility model, the integrated AC drive integrates the pitch controller, pitch driver, and capacitor charger, reducing the space occupied by the pitch controller and pitch charger within the central control cabinet, thereby reducing the overall installation space required.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine pitch technology, and in particular relates to an AC pitch device. Background Technology

[0002] Most wind turbines are equipped with DC pitch control systems. The DC pitch control system includes a DC pitch motor and a battery, as well as a separately installed pitch controller, pitch driver, and pitch charger for charging the battery. The pitch controller and pitch charger are located in the central control cabinet, the pitch driver is located in the shaft control cabinet, and the battery is located in the battery cabinet.

[0003] However, DC pitch converters involve many components, and correspondingly, they occupy a large amount of installation space within their respective cabinets. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides an AC pitch control device that can reduce the installation space required.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An AC pitch control device, comprising:

[0007] There are three shaft control cabinets, each containing three integrated AC drives. All three integrated AC drives are electrically connected to the main controller in the nacelle. Each integrated AC drive integrates a pitch controller, a pitch driver, and a capacitor charger.

[0008] A central control cabinet, which contains a first connection line for electrically connecting two integrated AC drives and a second connection line for electrically connecting the integrated AC drives to the cabin main controller.

[0009] Three battery cabinets, each housing three sets of supercapacitor modules, which are electrically connected to three integrated AC drives.

[0010] Three AC permanent magnet synchronous motors are electrically connected to three integrated AC drives.

[0011] Furthermore, the integrated AC driver incorporates a braking resistor.

[0012] Furthermore, the integrated AC driver incorporates a filter and a switching power supply.

[0013] Furthermore, the AC pitch control device includes a first temperature sensor for detecting the temperature inside the shaft control cabinet, a second temperature sensor for detecting the temperature inside the battery cabinet, a third temperature sensor for detecting the temperature inside the central control cabinet, and a fourth temperature sensor for detecting the temperature outside the central control cabinet. The first, second, third, and fourth temperature sensors are all electrically connected to an integrated AC driver.

[0014] Furthermore, the first connection line includes a first CANopen communication line disposed between the two integrated AC drivers.

[0015] Furthermore, the second connection line includes a power line, a signal line, and a second CANopen communication line located between the integrated AC drive and the cabin main controller.

[0016] Furthermore, a communication relay controller is provided on the second CANopen communication line; and / or a communication relay controller is provided on the signal line.

[0017] Furthermore, a motor power line and a motor feedback line for feeding back temperature information within the AC permanent magnet synchronous motor are provided between the integrated AC drive and the AC permanent magnet synchronous motor.

[0018] Furthermore, the AC pitch control unit includes three brakes, each electrically connected to one of three integrated AC drives.

[0019] Furthermore, the AC pitch control device includes three main limit switches and three redundant limit switches. The three main limit switches are electrically connected to three integrated AC drives, and the three redundant limit switches are electrically connected to three integrated AC drives, respectively.

[0020] The beneficial effects of this utility model are as follows:

[0021] The integrated AC drive integrates the pitch controller, pitch driver, and capacitor charger to reduce the space occupied by the pitch controller and pitch charger in the central control cabinet, thereby helping to reduce the overall installation space required. Attached Figure Description

[0022] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings. Wherein:

[0023] Figure 1 A system diagram of this utility model is shown;

[0024] Figure 2 The diagram shows the electrical connections of the integrated AC driver in this invention.

[0025] Figure 3 A schematic diagram of the control cabinet of a traditional DC pitch converter is shown.

[0026] Figure 4 A schematic diagram of the structure of a traditional DC pitch converter shaft control cabinet is shown.

[0027] Figure 5 A schematic diagram of the battery cabinet of a traditional DC pitch converter is shown.

[0028] Figure 6 This diagram shows the structure of the central control cabinet of this utility model;

[0029] Figure 7 This diagram shows the structure of the axis control cabinet of this utility model;

[0030] Figure 8 A schematic diagram of the battery cabinet of this utility model is shown;

[0031] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0032] Figure label:

[0033] 1. Main controller for engine room; 2. Slip ring system; 3. Communication relay controller; 4. Battery cabinet; 5. Supercapacitor module; 6. AC permanent magnet synchronous motor; 7. Axis control cabinet; 8. Integrated AC driver; 9. Central control cabinet; 10. Braking resistor. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] This utility model provides an AC pitch control device, such as... Figure 1 , Figure 2 , Figure 6-8 As shown, it includes:

[0036] Three shaft control cabinets 7, each housing three integrated AC drives 8, all three integrated AC drives 8 are electrically connected to the nacelle main controller 1 via a slip ring system 2. Each integrated AC drive 8 integrates a pitch controller, a pitch driver, and a capacitor charger.

[0037] A central control cabinet 9, which contains a first connection line for electrically connecting two integrated AC drives 8 and a second connection line for electrically connecting the integrated AC drives 8 to the cabin main controller 1.

[0038] Three battery cabinets 4, each housing a set of supercapacitor modules 5, which are electrically connected to three integrated AC drives 8. The supercapacitor modules 5 serve as backup power and are composed of three supercapacitors. The integrated AC drives 8 charge the three supercapacitors.

[0039] Three AC permanent magnet synchronous motors 6 are electrically connected to three integrated AC drivers 8 respectively. The power supply for the AC permanent magnet synchronous motors 6 is three-phase AC + PE.

[0040] Understandably, the integrated AC drive 8 integrates the pitch controller, pitch driver and capacitor charger to reduce the space occupied by the pitch controller and pitch charger in the central control cabinet 9, thereby helping to reduce the overall installation space occupied.

[0041] In addition, after the DC pitch motor is replaced with the AC permanent magnet synchronous motor 6, the AC permanent magnet synchronous motor 6 realizes energy conversion through electromagnetic induction, eliminating the need for carbon brushes to contact the commutator. This fundamentally avoids carbon buildup, electrical sparks, and carbon brush wear problems, and helps extend the service life of the bearings. At the same time, the integration of the integrated AC drive 8 reduces intermediate failure points, which helps reduce the failure rate.

[0042] It should be noted that, compared to traditional DC pitch control equipment, this AC pitch control equipment completely eliminates the safety and reliability risks present in traditional DC pitch control equipment by replacing the pitch driver, pitch motor, and battery with an integrated AC driver 8, an AC permanent magnet synchronous motor 6, and a supercapacitor module 5, respectively. Only some usable low-voltage components, connecting cables, and limit switches are retained. This is conducive to improving the availability and power generation of wind turbine units, thereby improving the quality and efficiency of wind farms.

[0043] In one embodiment, the integrated AC driver 8 has a built-in braking resistor 10.

[0044] It is understandable that the braking resistor 10 can consume the inertial energy generated during operation, so as to convert the regenerated energy into heat energy; specifically, it can consume the energy of the AC permanent magnet synchronous motor 6 in the generator mode, when the AC permanent magnet synchronous motor 6 decelerates, and when the power grid is over-voltage.

[0045] In one embodiment, the integrated AC driver 8 incorporates a filter and a switching power supply to suppress electromagnetic interference, stabilize power output, and achieve efficient power conversion, thereby ensuring stable operation of the driver and the AC permanent magnet synchronous motor 6.

[0046] In one embodiment, the AC pitch device includes a first temperature sensor for detecting the temperature inside the shaft control cabinet 7, a second temperature sensor for detecting the temperature inside the battery cabinet 4, a third temperature sensor for detecting the temperature inside the central control cabinet 9, and a fourth temperature sensor for detecting the temperature outside the central control cabinet 9. The first, second, third, and fourth temperature sensors are all electrically connected to an integrated AC driver 8.

[0047] Understandably, the temperatures of key components such as the shaft control cabinet 7, battery cabinet 4, and central control cabinet 9 can be detected by the first, second, third, and fourth temperature sensors to ensure that the equipment operates within the normal temperature range and thus prevent wind turbine failure due to overheating.

[0048] In one embodiment, the first connection line includes a first CANopen communication line disposed between the two integrated AC drives 8, so that the two integrated AC drives 8 can communicate with each other via CANopen, thereby facilitating data synchronization, collaborative control, fault diagnosis and system redundancy, and thus improving the reliability, control accuracy and maintenance efficiency of the AC pitch control equipment.

[0049] In one embodiment, the second connection line includes a power line, a signal line, and a second CANopen communication line disposed between the integrated AC drive 8 and the nacelle main controller 1, and adds a main control safety chain, a pitch safety chain, and a main control bypass signal monitoring point.

[0050] Understandably, power can be transmitted to the integrated AC drive 8 using a power line. For example, 400V AC power can be transmitted to the integrated AC drive 8, which then converts the power to drive the AC permanent magnet synchronous motor 6 and outputs power to the supercapacitor module 5 to charge it. When power is no longer supplied to the integrated AC drive 8, the supercapacitor module 5 can reverse the power supply to drive the AC permanent magnet synchronous motor 6, thus enabling the AC permanent magnet synchronous motor 6 to continue operating normally.

[0051] In addition, by using signal lines, electrical signals carrying information can be transmitted to the integrated AC driver 8, which is beneficial for controlling devices such as the AC permanent magnet synchronous motor 6 in the cabin.

[0052] In one embodiment, a communication relay controller 3 is provided on the second CANopen communication line; and / or a communication relay controller 3 is provided on the signal line.

[0053] Understandably, the communication relay controller 3 ensures efficient and reliable data transmission between the integrated AC drive 8 and the cabin main controller 1.

[0054] In one embodiment, an integrated AC driver 8 and an AC permanent magnet synchronous motor 6 are provided with a motor power line and a motor feedback line for feeding back temperature information inside the AC permanent magnet synchronous motor 6.

[0055] It is understandable that the integrated AC driver 8 can provide power to the AC permanent magnet synchronous motor 6 through the motor power line, and the motor feedback line can provide feedback on the temperature information inside the AC permanent magnet synchronous motor 6; accordingly, a temperature sensor needs to be installed inside the AC permanent magnet synchronous motor 6 to detect this temperature information.

[0056] In one embodiment, the AC pitch control device includes three brakes, which are electrically connected to three integrated AC drives 8 respectively, and the power supply of the brakes is 24V; wherein, the three brakes act on three AC permanent magnet synchronous motors 6 respectively.

[0057] In one embodiment, the AC pitch device includes three main limit switches and three redundant limit switches. The three main limit switches are electrically connected to three integrated AC drives 8, and the three redundant limit switches are electrically connected to the three integrated AC drives 8, respectively.

[0058] It should be noted that when the blade angle reaches 92°, the normal limit position for blade retraction, the main limit switch is triggered, which can trigger a first-level protection signal. The integrated AC drive 8 can immediately stop the AC permanent magnet synchronous motor 6 to prevent the blade from continuing to rotate. The redundant limit switch serves as the ultimate protection. When the main limit switch fails, specifically when the blade angle reaches 95°, the redundant limit switch is triggered, which can trigger a second-level protection signal. This allows the integrated AC drive 8 to forcibly stop the blade rotation using methods such as a brake.

[0059] It should be noted that this AC pitch control device is an improvement on the traditional DC pitch control device; the redundant encoder element does not need to be replaced, and the redundant design of the traditional DC pitch control system is maintained; the integrated AC drive 8 can also detect the voltage and current of the AC permanent magnet synchronous motor 6 and detect the A / B encoder; in addition, a pitch safety chain can be designed to provide dual redundancy protection of software and hardware safety chains.

[0060] It should also be noted that, Figure 3-5 This diagram shows the installation layout of the central control cabinet, shaft control cabinet, and battery cabinet in a traditional DC pitch converter. The central control cabinet houses various electrical components, including a watchdog module, surge protection module, switching power supply, relays, contactors, terminals, transformers, and circuit breakers. The shaft control cabinet contains relays, terminals, circuit breakers, DC servo drives, current detection modules, mains voltage detection modules, current and voltage detection modules, contactors, filters, and diodes. The battery cabinet contains lead-acid batteries, terminals, and heaters. Figure 3-5 It is evident that the central control cabinet, shaft control cabinet, and battery cabinet are basically filled with various electrical components.

[0061] and Figure 6-8The diagram shows the installation layout of the central control cabinet 9, shaft control cabinet 7, and battery cabinet 4 of the AC pitch converter. Compared to a traditional DC pitch converter, the dimensions of the central control cabinet 9, shaft control cabinet 7, and battery cabinet 4 remain unchanged. The central control cabinet 9 of the AC pitch converter houses a surge protection module, terminals, relays, and circuit breakers. The shaft control cabinet 7 houses an integrated AC drive 8, reactors, fuses, and circuit breakers. The battery cabinet 4 houses a supercapacitor module 5. Figure 6-8 It is evident that there is still considerable remaining space in the shaft control cabinet 7, battery cabinet 4, and especially the central control cabinet 9 of the AC pitch converter, which further demonstrates that using this AC pitch converter can reduce the installation space required.

[0062] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] While specific embodiments of the present invention have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An AC pitch control device, characterized in that, include: Three shaft control cabinets (7), each of the three shaft control cabinets (7) is equipped with three integrated AC drives (8), and each of the three integrated AC drives (8) is electrically connected to the nacelle main controller (1). The integrated AC drive (8) integrates a pitch controller, a pitch driver and a capacitor charger. A central control cabinet (9) is provided with a first connection line for electrically connecting the two integrated AC drives (8) and a second connection line for electrically connecting the integrated AC drives (8) and the cabin main controller (1). Three battery cabinets (4), each of the three battery cabinets (4) is equipped with three sets of supercapacitor modules (5), and each of the three supercapacitor modules (5) is electrically connected to the three integrated AC drivers (8). Three AC permanent magnet synchronous motors (6) are electrically connected to three integrated AC drivers (8).

2. The AC pitch control device according to claim 1, characterized in that, The integrated AC driver (8) has a built-in braking resistor (10).

3. The AC pitch control device according to claim 1, characterized in that, The integrated AC driver (8) has a built-in filter and switching power supply.

4. The AC pitch control device according to claim 1, characterized in that, It includes a first temperature sensor for detecting the temperature inside the shaft control cabinet (7), a second temperature sensor for detecting the temperature inside the battery cabinet (4), a third temperature sensor for detecting the temperature inside the central control cabinet (9), and a fourth temperature sensor for detecting the temperature outside the central control cabinet (9). The first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all electrically connected to the integrated AC driver (8).

5. An AC pitch control device according to claim 1, characterized in that, The first connection line includes a first CANopen communication line disposed between the two integrated AC drivers (8).

6. An AC pitch control device according to claim 1 or 5, characterized in that, The second connection line includes a power line, a signal line, and a second CANopen communication line disposed between the integrated AC drive (8) and the cabin main controller (1).

7. An AC pitch control device according to claim 6, characterized in that, A communication relay controller (3) is provided on the second CANopen communication line; and / or a communication relay controller (3) is provided on the signal line.

8. An AC pitch control device according to claim 1, characterized in that, A motor power line and a motor feedback line for feeding back temperature information inside the AC permanent magnet synchronous motor (6) are provided between the integrated AC driver (8) and the AC permanent magnet synchronous motor (6).

9. An AC pitch control device according to claim 1, characterized in that, It includes three brakes, each of which is electrically connected to one of the three integrated AC drives (8).

10. An AC pitch control device according to claim 1, characterized in that, It includes three main limit switches and three redundant limit switches. The three main limit switches are electrically connected to the three integrated AC drivers (8), and the three redundant limit switches are electrically connected to the three integrated AC drivers (8).

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