Variable pitch driver of wind generating set

Abstract

The invention provides a wind generating set variable-pitch driver, and relates to the technical field of wind power generation, the wind generating set variable-pitch driver comprises an alternating current input switch, an integrated driver, a control driving part and a proximity switch, the proximity switch senses the rotation angle of a blade in a non-contact manner, so that the position of the blade can be detected in real time, and a signal is fed back to the control driving part; and when a power grid breaks down, the super capacitor module which is charged previously serves as a backup energy source to supply power to the integrated driver, the angle of the blade is adjusted to 90 degrees in time, safety problems are prevented, and the service life of the integrated driver is prolonged. According to the system, the reactor, the integrated driver, the super capacitor module, the control driving piece and the proximity switch form an integrated system, so that a plurality of components in a non-integrated system in the prior art are reduced, the number of required components is small, wiring is small, the integration degree is high, and fault points are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a variable pitch drive for a wind turbine generator set. Background Art

[0002] Converting wind energy into electricity is a key area of new energy application. After nearly a century of development, modern wind turbine systems have continuously set new records in tower height, rotor diameter, output power, and control complexity. The latest domestic wind turbines alone can achieve an output power of 10 MW, a tower height of 115 meters, and a rotor diameter of 185 meters. The environments in which wind turbines operate are also constantly expanding. The highest onshore wind farm in China reaches an altitude of 4,700 meters, while the furthest offshore wind farm in China is 48 kilometers offshore. The increasing power and size of wind turbines, coupled with their expanding application scenarios, place higher demands on their adaptability to fluctuating wind speeds and their safety under extreme conditions. This is precisely the area in which wind turbine pitch control comes into play. Pitch control uses mechanical hydraulics or electric servos to control the rotation of the wind turbine blades, adjusting their pitch angle and altering the angle of attack of the airflow on the blades, thereby controlling the aerodynamic torque and power captured by the blades.

[0003] Electric pitch control is increasingly being adopted in wind turbines due to its ease of operation and maintenance, low cost, and high control response. Electric pitch control uses an electric servo controller to drive the pitch motor, which in turn drives a pinion, which in turn drives the blade's pitch bearing, thereby rotating the blades. Pitch control requires high reliability and environmental adaptability from the driver. A failure in a pitch drive can cause the turbine to shut down at best, or even endanger the safety of the entire tower. Even minimal repairs can result in significant economic losses to the wind farm due to power loss and the substantial repair costs.

[0004] In the prior art variable pitch drive system, a six-cabinet structure is adopted, including three shaft cabinets and three battery cabinets. The system is mainly composed of a variable pitch controller, a driver, a variable pitch motor, a backup power supply, etc. When a power grid failure occurs or the system is in the process of low voltage crossing (LVRT), a lead-acid battery is used as a backup power supply to power the driver. The variable pitch system is connected to the main control system in communication. The variable pitch system receives commands from the main control system and sends status information of the variable pitch system itself to the main control system. However, in the prior art, the drive system used is a non-integrated drive system, which is connected by providing multiple discrete AC / DC modules, DC / DC modules, power modules, diodes and other components to realize the drive of the variable pitch motor, resulting in a complex electrical circuit of the entire variable pitch system, too many system components, too much wiring, and an overly complex system design, which leads to a high system failure rate. Therefore, there are deficiencies. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a wind turbine pitch drive which adopts an integrated design, requires fewer components and wiring, and has a high degree of integration, thereby reducing its failure points and improving the reliability of the system.

[0006] This application is implemented as follows:

[0007] an AC power input switch, one end of the AC power input switch being connected to an AC power port, and the other end of the AC power input switch being electrically connected to a reactor;

[0008] An integrated driver, the integrated driver being electrically connected to the reactor, the integrated driver being electrically connected to a DC bus unit, the DC bus unit being electrically connected to a supercapacitor module, and one end of the integrated driver being electrically connected to a pitch motor;

[0009] A control driver, the control driver being communicatively connected to the integrated driver and configured to control the integrated driver;

[0010] A proximity switch is installed on the pitch motor and is communicatively connected to the control drive component.

[0011] In one embodiment of the present application, the DC bus unit is electrically connected to a bleeder resistor unit, and the bleeder resistor unit is connected in parallel with the supercapacitor module, and the bleeder resistor unit is communicatively connected to the control drive component.

[0012] In one embodiment of the present application, the integrated driver includes a first voltage switching unit, a drive unit, a supercapacitor charger, and a second voltage switching unit, wherein the first voltage switching unit, the drive unit, the supercapacitor charger, and the second voltage switching unit are electrically connected to each other, the first voltage switching unit is electrically connected to the inductor, and the second voltage switching unit is electrically connected to the control drive and the proximity switch.

[0013] In one embodiment of the present application, the first voltage switching unit includes a rectifier unit, and the rectifier unit is electrically connected to the reactor and the supercapacitor charger.

[0014] In one embodiment of the present application, the rectifier unit is electrically connected to a relay, and the relay is electrically connected between the rectifier unit and the supercapacitor charger.

[0015] In one embodiment of the present application, the second voltage switching unit is a V switching power supply.

[0016] In one embodiment of the present application, the supercapacitor charger includes a second rectifier unit and a DC converter, and the second rectifier unit and the DC converter are electrically connected.

[0017] In one embodiment of the present application, the first voltage switching unit is electrically connected to a surge suppressor, and the surge suppressor is electrically connected to the reactor.

[0018] In one embodiment of the present application, the control drive component includes a PIC controller and a main control system. The PIC controller is communicatively connected to the integrated driver and the proximity switch, and the main control system is communicatively connected to the PIC controller.

[0019] In one embodiment of the present application, the PIC controller is connected to the main control system via wireless communication, and the PIC controller is connected to the integrated driver and the proximity switch via wireless communication.

[0020] The beneficial effects of this application are: the 400VAC high-voltage AC power of the power grid is transmitted to the AC input switch through the AC port, and then the high-frequency harmonics and surge current are filtered out by the inductor, and then reach the integrated drive. Through the voltage switching and rectification of the integrated drive, 540VDC DC and 24VDC DC are formed respectively. The 540VDC DC is further reduced by the integrated drive to reach the appropriate voltage of 450VDC, and is charged to the supercapacitor module through the DC bus unit. After charging is completed, the DC bus unit is turned off to prevent overshoot. The 24VDC DC is used to power the proximity switch and the control drive, and the pitch control command is sent through the control drive, so that the 450VDC is converted into three-phase AC in the integrated drive, thereby driving the pitch motor to rotate, adjusting the blade angle, and through the proximity switch The contactless sensing of the blade rotation angle can detect the blade position in real time, and feed back the signal to the control drive so that the control drive can fine-tune the output to ensure the pitch angle accuracy. In addition, in the event of a power grid failure, the previously charged supercapacitor module serves as a backup energy source to supply power to the integrated drive, and the blade angle is adjusted to 90 degrees in time to prevent safety problems. This system forms an integrated system through inductors, integrated drives, supercapacitor modules, control drives and proximity switches, which reduces multiple components in the non-integrated system of the prior art, requires fewer components, has fewer wirings, and has a high degree of integration, thereby reducing its failure points and improving the reliability of the system, thereby solving the problems of low integration of the variable pitch drive system in the prior art, more interface wiring, more failure points and higher failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A system schematic diagram of a wind turbine pitch drive is provided for an embodiment of the present application;

[0023] Figure 2 A system diagram of an integrated driver is provided for an embodiment of the present application;

[0024] Figure 3 A system diagram of a supercapacitor charger is provided for an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a system for controlling a driving member is provided for an embodiment of the present application;

[0026] In the figure: 100-AC input switch; 200-AC port; 300-reactor; 400-integrated driver; 410-first voltage switching unit; 411-rectifier unit; 412-relay; 420-drive unit; 430-supercapacitor charger; 431-second rectifier unit; 432-DC converter; 440-second voltage switching unit; 450-surge suppressor; 500-DC bus unit; 510-bleeder resistor unit; 600-supercapacitor module; 700-pitch motor; 800-control drive unit; 810-PIC controller; 820-main control system; 900-proximity switch; DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0028] like Figures 1-4 As shown, a wind turbine generator set pitch drive according to an embodiment of the present application includes:

[0029] An AC power input switch 100 , one end of which is connected to an AC power port 200 , and the other end of which is electrically connected to a reactor 300 ;

[0030] An integrated driver 400 is electrically connected to the reactor 300 , is electrically connected to a DC bus unit 500 , is electrically connected to a supercapacitor module 600 , and one end of the integrated driver 400 is electrically connected to a pitch motor 700 ;

[0031] A control driver 800 , the control driver 800 is communicatively connected to the integrated driver 400 , and the control driver 800 is used to control the integrated driver 400 ;

[0032] Proximity switch 900, which is mounted on the pitch motor 700 and is in communication with the control drive 800. The proximity switch 900 is mounted on the hub of the pitch motor 700 and is used to detect the rotation state and actual rotation angle of the pitch motor 700. The 400VAC high-voltage AC power of the power grid is transmitted to the AC input switch 100 through the AC port 200, and then filtered out high-frequency harmonics and surge currents through the inductor 300, and reaches the integrated driver 400. Through the voltage switching and rectification of the integrated driver 400, 540VDC DC and 24VDC DC are formed respectively. The 540VDC DC is further reduced to the appropriate voltage of 450VDC through the integrated driver 400, and charged to the supercapacitor module 600 through the DC bus unit 500. After charging is completed, the DC bus unit 500 is turned off to prevent overshoot. The 24VDC DC power supplies power to the proximity switch 900 and the control drive 800, and the pitch command is sent through the control drive 800, thereby converting the 450VDC into three-phase AC in the integrated driver 400, thereby driving the pitch motor 700 to rotate, adjusting the blade angle, and The switch 900 senses the rotation angle of the blade contactlessly, thereby detecting the blade position in real time, and feeding back the signal to the control drive 800, so that the control drive 800 can fine-tune the output, thereby ensuring the pitch angle accuracy. In addition, in the event of a power grid failure, the previously charged supercapacitor module 600 serves as a backup energy source to supply power to the integrated driver 400, adjusting the blade angle to 90 degrees in time to prevent safety problems. This system forms an integrated system through the inductor 300, the integrated driver 400, the supercapacitor module 600, the control drive 800 and the proximity switch 900, reducing multiple components in the non-integrated system of the prior art, requiring fewer components, less wiring, and a high degree of integration, thereby reducing its failure points, thereby improving the reliability of the system, thereby solving the problems of low integration, more interface wiring, more failure points and higher failure rate of the variable pitch drive system in the prior art.

[0033] like Figure 1As shown, the DC bus unit 500 is electrically connected to the bleeder resistor unit 510 , and the bleeder resistor unit 510 is connected in parallel with the supercapacitor module 600 . The bleeder resistor unit 510 is communicatively connected to the control driver 800 . The discharge resistor unit 510 is a safety protection and is used to facilitate the replacement of the supercapacitor module 600. By connecting the supercapacitor module 600 in parallel, when the supercapacitor module 600 needs to be replaced, the DC bus unit 500 is disconnected from the integrated driver 400. However, due to the previous circuit connection, the positive and negative ports of the DC bus unit 500 still have a large current. In order to ensure the safety of the replacement personnel and prevent the replacement personnel from electric shock, circuit switching is required during replacement, and the large current at the positive and negative ports of the DC bus unit 500 is introduced into the discharge resistor unit 510. The electrical energy is converted into heat energy through the discharge resistor unit 510, thereby forming heat energy dissipation and consuming the large current at the positive and negative ports of the DC bus unit 500. When the port voltage of the DC bus unit 500 is detected to be 0, it indicates that the electrical energy is completely consumed. At this time, personnel can contact the DC bus unit 500, thereby facilitating the replacement of the supercapacitor module 600.

[0034] like Figure 2 As shown, the integrated driver 400 includes a first voltage switching unit 410, a drive unit 420, a supercapacitor charger 430, and a second voltage switching unit 440. The first voltage switching unit 410, the drive unit 420, the supercapacitor charger 430, and the second voltage switching unit 440 are electrically connected to each other. The first voltage switching unit 410 is electrically connected to the reactor 300, and the second voltage switching unit 440 is electrically connected to the control driver 800 and the proximity switch 900. The first voltage switching unit 410 is used to convert 400VAC high-voltage alternating current into 540VDC direct current. The supercapacitor charger 430 then integrates and steps down the 540VDC direct current to 450VDC direct current, thereby facilitating charging of the supercapacitor module 600. At the same time, the 450VDC direct current enters the second voltage switching unit 440, which further steps down the 450VDC direct current to 24VDC direct current, thereby facilitating low-voltage power supply to the proximity switch 900 and the control driver 800. The first voltage switching unit 410 is electrically connected to a surge suppressor 450 , which is electrically connected to the reactor 300 , to further prevent grid surge fluctuations and ensure a more stable input of high voltage electricity into the integrated driver 400 .

[0035] like Figure 3 As shown, the first voltage switching unit 410 includes a rectifier unit 411, which is electrically connected to the reactor 300 and the supercapacitor charger 430. The rectifier unit 411 can convert AC power into DC power, that is, convert 400VAC AC power into 540VDC DC power.

[0036] Furthermore, the rectifier unit 411 is electrically connected to a relay 412, which is electrically connected between the rectifier unit 411 and the supercapacitor charger 430. The relay 412 is used to protect the circuit and prevent the circuit connection to the subsequent supercapacitor charger 430 from being cut off when the current is too large, thereby preventing damage to the equipment.

[0037] Furthermore, the second voltage switching unit 440 is a 24V switching power supply that automatically adjusts high voltage current to a low voltage current of 24V, thereby facilitating power supply to the proximity switch 900 and the PIC controller 810 .

[0038] Furthermore, the supercapacitor charger 430 includes a second rectifier unit 431 and a DC converter 432, which are electrically connected to each other. The second rectifier unit 431 rectifies the current and converts the 540VDC direct current into 450VDC direct current through the DC converter 432.

[0039] like Figure 4 As shown, the control drive unit 800 includes a PIC controller 810 and a main control system 820. The PIC controller 810 is communicatively connected to the integrated driver 400 and the proximity switch 900, and the main control system 820 is communicatively connected to the PIC controller 810. The PIC controller 810 and the main control system 820 are wirelessly connected, and the PIC controller 810 is also wirelessly connected to the integrated driver 400 and the proximity switch 900. The PIC controller 810 is remotely controlled by the staff through the main control system 820. The PIC controller 810 is used to control the switching of the internal circuits of the integrated driver 400, the switching of the drive unit 420, the activation of the bleeder resistor unit 510, and the real-time reception of position detection information of the blade angle from the proximity switch 900.

[0040] In summary, the working principle of a wind turbine pitch drive according to an embodiment of the present invention is as follows: the 400VAC high-voltage AC power of the power grid is transmitted to the AC input switch 100 through the AC port 200, and then filtered out high-frequency harmonics and surge currents through the reactor 300, and reaches the rectifier unit 411. The voltage switching and rectification of the rectifier unit 411 forms 540VDC direct current, which is converted into 450VDC direct current through the DC converter 432. The 450VDC direct current forms 24VDC direct current through the second voltage switching unit 440. The 450VDC direct current is charged to the supercapacitor module 600 through the DC bus unit 500. After charging is completed, the DC bus unit 500 is turned off to prevent overshoot. The 24VDC direct current powers the proximity switch 900 and the control drive 800, and sends a pitch control instruction by controlling the PIC controller 810, thereby converting the 450VDC into three-phase AC power in the drive unit 420. The variable pitch motor 700 is driven to rotate, the blade angle is adjusted, and the rotation angle of the blade is sensed contactlessly through the proximity switch 900, so that the blade position can be detected in real time, and the signal is fed back to the PIC controller 810, so that the PIC controller 810 can fine-tune the output to ensure the pitch angle accuracy. In addition, when the power grid fails, the previously charged supercapacitor module 600 serves as a backup energy source to supply power to the drive unit 420, and the blade angle is adjusted to 90 degrees in time to prevent safety problems. The system forms an integrated system through the inductor 300, the integrated driver 400, the supercapacitor module 600, the control drive 800 and the proximity switch 900, which reduces multiple components in the non-integrated system of the prior art, requires fewer components, less wiring, and has a high degree of integration, thereby reducing its failure points, thereby improving the reliability of the system, thereby solving the problems of low integration, more interface wiring, more failure points and higher failure rate of the variable pitch drive system in the prior art.

[0041] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0042] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0043] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention 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 invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wind turbine pitch drive, characterized in that: include: an AC power input switch (100), one end of the AC power input switch (100) being connected to an AC power port (200), and the other end of the AC power input switch (100) being electrically connected to a reactor (300); An integrated driver (400), the integrated driver (400) being electrically connected to the reactor (300), the integrated driver (400) being electrically connected to a DC bus unit (500), the DC bus unit (500) being electrically connected to a supercapacitor module (600), and one end of the integrated driver (400) being electrically connected to a pitch motor (700); a control drive member (800), the control drive member (800) being communicatively connected to the integrated driver (400), the control drive member (800) being used to control the integrated driver (400); A proximity switch (900) is installed on the pitch motor (700), and the proximity switch (900) is communicatively connected to the control drive component (800).

2. A wind turbine pitch drive according to claim 1, characterized in that: The DC bus unit (500) is electrically connected to a discharge resistance unit (510), and the discharge resistance unit (510) is connected in parallel with the supercapacitor module (600), and the discharge resistance unit (510) is communicatively connected to the control drive component (800).

3. The wind turbine generator set pitch drive according to claim 1, characterized in that: The integrated driver (400) comprises a first voltage switching unit (410), a driving unit (420), a supercapacitor charger (430), and a second voltage switching unit (440); the first voltage switching unit (410), the driving unit (420), the supercapacitor charger (430), and the second voltage switching unit (440) are electrically connected to each other; the first voltage switching unit (410) is electrically connected to the reactor (300); and the second voltage switching unit (440) is electrically connected to the control driver (800) and the proximity switch (900).

4. A wind turbine pitch drive according to claim 3, characterized in that: The first voltage switching unit (410) includes a rectifier unit (411), and the rectifier unit (411) is electrically connected to the reactor (300) and the supercapacitor charger (430).

5. A wind turbine pitch drive according to claim 4, characterized in that: The rectifier unit (411) is electrically connected to a relay (412), and the relay (412) is electrically connected between the rectifier unit (411) and the supercapacitor charger (430).

6. A wind turbine pitch drive according to claim 3, characterized in that: The second voltage switching unit (440) is a 24V switching power supply.

7. The wind turbine generator set pitch drive according to claim 3, characterized in that: The supercapacitor charger (430) comprises a second rectifying unit (431) and a DC converter (432), and the second rectifying unit (431) and the DC converter (432) are electrically connected.

8. The wind turbine generator set pitch drive according to claim 3, characterized in that: The first voltage switching unit (410) is electrically connected to a surge suppressor (450), and the surge suppressor (450) is electrically connected to the reactor (300).

9. The wind turbine generator set pitch drive according to claim 1, characterized in that: The control drive component (800) includes a PIC controller (810) and a main control system (820), wherein the PIC controller (810) is communicatively connected to the integrated driver (400) and the proximity switch (900), and the main control system (820) is communicatively connected to the PIC controller (810).

10. A wind turbine pitch drive according to claim 9, characterized in that: The PIC controller (810) is connected to the main control system (820) by wireless communication, and the PIC controller (810) is connected to the integrated driver (400) and the proximity switch (900) by wireless communication.

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