CN108590962B

CN108590962B - Feathering device, pitch-changing system and pitch-changing method of wind generating set

Info

Publication number: CN108590962B
Application number: CN201810699234.8A
Authority: CN
Inventors: 王学成
Original assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Current assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2024-04-19
Anticipated expiration: 2038-06-29
Also published as: CN108590962A

Abstract

The embodiment of the application provides a feathering device, a pitching system and a pitching method of a wind generating set. The feathering device is fixedly arranged in the hub and comprises an energy storage component, a control mechanism and a driving mechanism; the energy storage component comprises a driving arm and an elastic piece; the driving end of the driving arm is in transmission connection with the driving mechanism, and the control end of the driving arm is connected with the control mechanism; the driving mechanism is arranged on the variable pitch bearing; the driving arm is used for extruding the elastic piece under the drive of the driving mechanism, and the control mechanism is used for locking the driving arm in the state of extruding the elastic piece, so that the energy storage component is in an energy storage state; and releasing the driving arm when the emergency feathering condition is met, so that the driving arm drives the driving mechanism to feathering the blades under the rebound action of the elastic piece, and the energy storage assembly enters an energy release state. The embodiment of the application effectively improves the safety and reliability of the wind generating set.

Description

Feathering device, pitch-changing system and pitch-changing method of wind generating set

Technical Field

The application relates to the technical field of wind generating sets, in particular to a feathering device, a pitch control system and a pitch control method of the wind generating set.

Background

As wind energy is gradually recognized, familiar and utilized, the generation of wind power generation sets plays a significant role in the sustainable development and green development of new energy sources, horizontal axis wind power generation sets also go from the first tens or even thousands of KW to the MW level of today, and safety control systems of wind power generation sets also develop from the initial single protection by blade stall to the use of pitch systems to promote wind energy utilization efficiency and multiple safety protection. In the wind generating set with the current energy of more than 1.5MW, each blade is provided with a set of servo control pitch system independently for controlling the blades. Under the condition of grid-connected normal operation of the wind turbine generator, the variable pitch system controls the variable pitch motor to drive the blades to open to the 0-degree position through the driver, the blades can capture wind energy to the maximum extent so as to realize optimal power output of the wind turbine generator, when the wind speed exceeds the rated allowable wind speed of the wind turbine generator, the variable pitch system participates in control at the moment, and the blade pitch angle is controlled in real time by receiving a main control given target position or a speed command so as to enable the rotating speed of the impeller of the wind turbine generator to be rated, and the power of the wind turbine generator is optimal.

The other main function of the pitch control system is to realize main pneumatic braking when the wind power generator unit is stopped, and the pitch control system is responsible for controlling the feathering of the blades from the 0-degree position to the 87-degree safe position every time when the wind power generator is stopped normally or in emergency fault. However, in actual situations, if any fault occurs in the pitch system controller, the driver, the super capacitor and the pitch motor, the system is abnormal and the blades cannot be feathered to a safe position, and the occurrence of the failure of feathering of the blades can bring serious consequences to the safety of the wind generating set. Therefore, the detection sensor, the controller, the redundant design and the multiple safety protection of the pitch system are important preconditions for the design of the pitch safety system, and the reliability and the safety of the pitch system are also more and more important.

The pitch system of the wind generating set mainly comprises a charging unit, a driver, a pitch motor, a controller, a battery or a capacitor energy storage system. Under normal conditions, the charging unit provides electric energy for the driver, the driver controls the variable pitch motor to output mechanical torque to control the blades to rotate, and if an external power grid is powered down, the capacitor energy storage system can only be used for providing electric energy for the driver to feathers. In the emergency process, a controller, a measuring sensor, a driver, a pitch motor and a capacitive energy storage system are required to be feathered under normal conditions. Abnormal feathering can not be performed in any link in the pitch system. The wind turbine generator system comprises a controller, a sensor, a driver, a variable pitch motor and a wind turbine generator system, wherein the failure of the system can lead the blades of the wind turbine generator system to be unable to retract to a safe position, the rotation speed of the impeller of the wind turbine generator can be continuously increased under the action of external continuous wind power, the generator is overspeed, and finally, the wind turbine generator system can be broken or collapse when the load of the wind turbine generator system exceeds the limit load of a tower.

At present, most of the machine set variable pitch systems use super capacitors or batteries as emergency feathering backup energy storage modes of the variable pitch systems. The series-parallel connection of the super capacitor has the problems of single voltage equalizing, unbalanced voltage and the like; moreover, the short circuit is easy to cause fire, the internal resistance ESR of the capacitor is increased during long-term operation, the capacitance value is attenuated and reduced, and the on-line detection is difficult; and it also has the conditions of complicated operation and maintenance, overhaul danger, etc.

Disclosure of Invention

Aiming at the defects of the existing mode, the application provides a feathering device, a pitching system and a pitching method of a wind generating set, which are used for solving the technical problems that the feathering cannot be safely carried out when key components of the pitching system are out of order under the condition of power failure of a power grid, the risk of over-speed galloping is easy to occur, and the safety and reliability of the wind generating set cannot be effectively ensured when the wind generating set uses a backup super capacitor or a battery as a backup power supply in the prior art.

In a first aspect, an embodiment of the present application provides a feathering device of a wind generating set, where the feathering device is fixedly disposed in a hub, and the feathering device includes an energy storage component, a control mechanism and a driving mechanism;

the energy storage component comprises a driving arm and an elastic piece;

The driving end of the driving arm is in transmission connection with the driving mechanism, and the control end of the driving arm is connected with the control mechanism; the driving mechanism is arranged on the variable pitch bearing;

the driving arm is used for extruding the elastic piece under the drive of the driving mechanism, and the control mechanism is used for locking the driving arm in the state of extruding the elastic piece, so that the energy storage component is in an energy storage state; and releasing the driving arm when the emergency feathering condition is met, so that the driving arm drives the driving mechanism to feathering the blades under the rebound action of the elastic piece, and the energy storage assembly enters an energy release state.

In a second aspect, an embodiment of the present application provides a pitch system of a wind turbine, including: the feathering device, the controller, the driver, the variable pitch motor, the variable pitch speed reducer and the variable pitch bearing of the wind generating set are provided in the first aspect of the embodiment of the application;

the controller is electrically connected with the driver and is used for outputting a pitch angle control signal;

The driver is electrically connected with the pitch motor and is used for outputting pitch voltage to the pitch motor according to the pitch angle control signal;

the pitch motor is in transmission connection with the pitch speed reducer and is used for outputting rotating torque to the pitch speed reducer according to the pitch voltage;

the variable-pitch speed reducer is in transmission connection with the variable-pitch bearing and is used for driving the variable-pitch bearing to rotate according to the rotating torque;

The variable pitch bearing is in transmission connection with the feathering device and is used for providing mechanical energy for the feathering device by utilizing self rotation;

The controller is electrically connected with the feathering device and is used for controlling the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the variable-pitch bearing so that the variable-pitch bearing feathers the blades.

In a third aspect, an embodiment of the present application provides a wind generating set, including a pitch system of the wind generating set provided in the second aspect of the embodiment of the present application.

In a fourth aspect, an embodiment of the present application provides a pitch method for a pitch system of a wind turbine generator set provided in the second aspect of the present application, including:

The controller outputs a pitch angle control signal to the driver;

the driver outputs pitch voltage to the pitch motor according to the pitch angle control signal;

the variable pitch motor outputs a rotating torque to the variable pitch speed reducer according to the variable pitch voltage;

The variable-pitch speed reducer drives the variable-pitch bearing to rotate according to the rotating torque;

The variable-pitch bearing provides mechanical energy for the feathering device by utilizing self rotation;

The controller controls the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the variable-pitch bearing so that the variable-pitch bearing feathers the blades.

The technical scheme provided by the embodiment of the application has the beneficial technical effects that:

According to the feathering device, elastic potential energy is obtained through the mode that the driving arm extrudes the elastic piece, when emergency feathering is needed, the driving arm is released through the control mechanism, and the elastic piece drives the blades to perform emergency feathering through the mode that elastic restoring force does work. Therefore, the application is different from the existing capacitor/battery type feathering device, uses elastic potential energy as backup energy of the feathering device as driving, completely avoids the problems of unbalanced direct current voltage, gradually increased internal resistance, reduced capacity, incapability of working in hot and low-temperature environments and easy short-circuit fire, and can avoid the problems of difficult maintenance operation of backup power supply, and the like.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a pitch system of a wind turbine generator system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a feathering apparatus of a wind turbine generator system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a feathering apparatus of a wind turbine generator system according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of an overall structure of a pitch system of a wind turbine generator system according to an embodiment of the present application;

FIG. 5 is a schematic frame view of an overall structure of a pitch system of a wind turbine generator system according to an embodiment of the present application;

FIG. 6 is a schematic control flow diagram of a pitch system of a wind turbine generator system according to an embodiment of the present application;

Fig. 7 is a flowchart of a pitch method of a pitch system of a wind turbine generator system according to an embodiment of the present application.

The description of the reference numerals is as follows:

1-an energy storage assembly; 11-driving arm; 111-driving end; 112-control end; 113-a bottom plate; 114-a multi-layer boss; 1111-slide rails; 12-an elastic member; 13-an energy storage cylinder;

2-a control mechanism; 21-a connecting rod assembly; 211-a first link; 212-a second link; 213-a third link; 214-a fourth link; 215-a first movable fulcrum; 216-a second movable fulcrum; 22-a control assembly; 221-a fork; 222-connecting rod; 223-meniscus; 224-a trigger coil; 225-a first return spring; 226-a second return spring; 23-travel switch;

3-a driving mechanism; 31-a drive shaft; 32-a drive link;

4-a manual energy storage unit; 41-driving wheels; 411-operating wheels; 412-a driving wheel; 42-an energy storage connecting rod; 5-a damper;

100-feathering device; 201-a controller; 202-a driver; 203-a pitch motor; 2031-electromagnetic brake; 204-a pitch reducer; 205-pitch bearing; 206-overspeed switch; 207-bearing plate; 208-encoder; 209-a pitch charger; 301-a hub; 302-hub support.

Detailed Description

The present application is described in detail below, examples of embodiments of the application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

First, several terms related to the present application are described and explained:

The pitch angle (PITCH ANGLE), also called pitch angle, is the angle between the wind wheel plane and the pitch angle of the wind driven generator by adopting variable pitch control and adjusting the power by adjusting the windward angle of the blade; the purpose of adjusting the pitch angle of the wind driven generator is mainly that:

(1) Starting, obtaining relatively large torque under the action of wind force, and driving blades of the wind driven generator to rotate;

(2) Limiting power output, stabilizing power after rated wind speed, protecting machinery and circuit systems, and simultaneously reducing load;

(3) When the propeller is retracted, pneumatic braking is realized, so that the rotating speed of the blade is reduced rapidly, and damage caused by too large inertia force due to mechanical braking is avoided.

Elastic potential energy (Elastic Potential Energy), which is a potential mechanical energy stored in the construction of an elastic material or physical system, because work is performed to distort its volume or shape. Elastic energy occurs when compression and stretching or deformation in substantially any manner is desired.

The hydraulic damper (Hydraulic Buffer) is a hydraulic feed rate control device capable of freely adjusting the feed rate of the cylinder from high speed to low speed within a desired range.

The Backup Power supply (Backup Power) is an automatic driving quasi-line Power supply which can effectively prevent the driving circuit from having normal voltage, and can prolong the voltage required by the circuit so as to provide electric energy for the circuit to work normally.

Feathering (Feather) refers to a control process of turning blades of a wind driven generator to a parallel state (also called a safe position, in a specific angle, turning to a position direction of 89 degrees or so of the blades to take up the paddles) close to the direction of wind after the wind driven generator fails. At the moment, the wind energy absorbed by the blades of the wind driven generator is minimum, so that the wind driven generator can play a role in pneumatic braking, and the wind driven generator is safely stopped.

Aiming at the problems that the existing wind generating set uses a backup super capacitor or a battery as a backup power supply, key components of a variable pitch system fail and cannot be feathered safely under the condition of power failure of a power grid, the risk of over-speed galloping is easy to occur, and the safety and reliability of the set cannot be effectively ensured.

Based on the safety design problem, the application provides an elastic potential energy storage emergency feathering variable-pitch system of a wind generating set, which can solve the problem of the blockage caused by the problems of electric control, a driver, a super capacitor capacity and the like, which are easy to occur when a backup power supply such as a super capacitor or a battery is used at present, and improves the safety feathering reliability of the variable-pitch system in an emergency stop mode or an emergency stop mode.

The feathering device, the pitching system and the pitching method thereof of the wind generating set can solve the problem of blockage of the feathering caused by the problems of electric control, a driver and the capacity of the super capacitor, which are easy to occur when the backup power source such as the super capacitor or a battery is used at present for storing energy, and improve the safety feathering reliability of the pitching system in an emergency stop mode or an emergency stop mode.

The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments.

The embodiment of the application provides a feathering device of a wind generating set, wherein the structural schematic diagram of the feathering device of the wind generating set is shown in fig. 1 to 4, a feathering device 100 is fixedly arranged in a hub 301, and the feathering device 100 comprises an energy storage component 1, a control mechanism 2 and a driving mechanism 3;

the energy storage assembly 1 comprises a driving arm 11, an elastic piece 12 and an energy storage cylinder 13;

the elastic piece 12 is fixedly connected in the energy storage cylinder 13, and one end of the elastic piece 12 is opposite to the driving arm 11;

the driving end 111 of the driving arm 11 is in transmission connection with the driving mechanism 3, and the control end 112 of the driving arm 11 is connected with the control mechanism 2; the driving mechanism 3 is arranged on the pitch bearing 205;

The driving arm 11 is used for extruding the elastic piece 12 under the drive of the driving mechanism 3, and the control mechanism 2 is used for locking the driving arm 11 in the state of extruding the elastic piece 12 so that the energy storage component 1 is in an energy storage state; and releasing the driving arm 11 when the emergency feathering condition is met, so that the driving arm 11 drives the driving mechanism 3 to feathering the blades under the rebound action of the elastic piece 12, and the energy storage component 1 enters an energy release state.

As shown in fig. 1 to 4, the driving arm 11 may have a rod-shaped structure, and two ends thereof are a driving end 111 and a control end 112, respectively. The drive arm 11 is provided penetrating through the accumulator 13 and is slidable with respect to the accumulator 13. The elastic member 12 may specifically adopt a round spring structure, which may be fixedly disposed in the energy storage cylinder 13, and one end of the elastic member may face the driving arm. The energy storage cylinder 13 may specifically be a hollow cylinder structure, the driving arm 11 is slidably disposed inside the energy storage cylinder 13, and the elastic member 12 may be sleeved on the driving arm 11, and the elastic member is located inside the energy storage cylinder. The driving end 111 of the driving arm 11 may be in driving connection with the driving mechanism 3, and the control end 112 may be connected with the control mechanism 2.

In actual application, the driving mechanism 3 drives the driving arm 11 to transversely slide, the driving arm 11 extrudes the elastic piece 12 and obtains elastic potential energy, and the control mechanism 2 can lock the driving arm 11 at the moment, so that the energy storage component 1 is in an energy storage state; when the wind generating set needs feathering, the control mechanism 2 releases the driving arm 11, so that the driving arm 11 drives the driving mechanism 3 to feathering the blades under the rebound action of the elastic piece 12, and the energy storage component 1 enters an energy release state. The feathering device is different from the existing capacitor/battery feathering device, uses elastic potential energy as backup energy of the feathering device as driving, completely avoids the problems of unbalanced direct current voltage, gradually increased internal resistance, reduced capacitance, incapability of working in hot and low-temperature environments and easy short-circuit fire, and can avoid the problems of difficult maintenance operation of backup power supply, and the like.

Of course, it should be noted that the energy storage cylinder and the elastic member are not necessarily circular structures, the energy storage cylinder may be other shaped structures in other embodiments, and the elastic member may be a plurality of types of springs, so long as the energy storage component can perform the energy storage function of elastic potential energy, and the present application is not limited to the specific structure and the arrangement manner thereof.

Optionally, as shown in fig. 2 and fig. 3, in the feathering device of the wind generating set in the embodiment of the application, a bottom plate 113 is fixedly arranged on a driving arm 11, the bottom plate 113 is slidably arranged in an energy storage cylinder 13, one end of an elastic member 12 is fixed on a cylinder cover of the energy storage cylinder 13, the other end is opposite to the bottom plate 113, and the driving arm 11 is used for sliding relative to the energy storage cylinder 13, so that the bottom plate 113 extrudes the elastic member 12 under the driving of the driving arm 11; and/or the driving arm 11 penetrates through the energy storage cylinder 13 and the elastic member 12; and/or, the elastic pieces 12 are a plurality of, the bottom plate 113 and the cylinder cover are oppositely provided with a plurality of layers of bosses 114, and the elastic pieces 12 are sequentially arranged corresponding to the plurality of layers of bosses 114.

As shown in fig. 2 and 3, the bottom plate 113 may have a circular plate-like structure, which is fixedly disposed at a middle position of the driving arm 11. The bottom plate 113 is disposed inside the energy storage cylinder 13 and can slide relative to the energy storage cylinder 13 under the driving of the driving arm 11. The two ends of the elastic piece 12 can be respectively propped against the bottom plate 113 and the cylinder cover of the energy storage cylinder 13, and the application adopts a simpler structure to realize the basic structure of the energy storage component 1, thereby not making the structure simple and practical, and being easy to maintain.

Furthermore, the elastic member 12 may be a plurality of round springs with different diameters, and the plurality of elastic members 12 may be sleeved on the driving arm 11 from small to large, so that the structure of the present application is stable. Still further, the two opposite surfaces of the bottom plate 113 and the cylinder cover of the energy storage cylinder 113 are respectively provided with a plurality of layers of bosses 114, and the plurality of layers of bosses 114 can be correspondingly arranged with the plurality of elastic pieces 12 so as to clamp and fix the plurality of elastic pieces 12, thereby further improving the stability of the structure of the application.

It should be noted that the present application is not limited to the specific shape of the bottom plate, and the shape of the elastic member may be set corresponding to the shape of the energy storage cylinder, for example, in an embodiment, the energy storage cylinder may be a rectangular hollow structure, so the present application is not limited thereto.

Alternatively, as shown in fig. 2 and 3, in the feathering apparatus of the wind turbine according to the embodiment of the present application, the control mechanism 2 includes a link assembly 21 and a control assembly 22.

The linkage assembly 21 is connected to the control end 112 of the drive arm 11 and the control assembly 22 is configured to lock or unlock the drive arm 11 by controlling the linkage assembly 21. The main function of the connecting rod assembly 21 is to reduce the reverse acting force of the energy storage assembly 1, and the control assembly 22 can lock and release the driving arm 11 with a small force.

However, it should be noted that the present application is not limited to the specific embodiment of the control mechanism, for example, in another embodiment, the control mechanism may be a marble mechanism, and the energy storage assembly may lock or release the driving arm by means of a snap-fit manner after completing energy storage. The control mechanism thus has a variety of embodiments, and the application is not limited in this regard.

Alternatively, as shown in fig. 2 and 3, the link assembly 21 includes a first link 211, a second link 212, a third link 213, and a fourth link 214.

One end of the first link 211 is rotatably connected to the control end 112.

One end of the second link 212 is rotatably connected to the other end of the first link 211 and one end of the third link 213, and a first movable fulcrum 215 is formed at the rotational connection, and the other end of the second link 212 is pivotally provided.

The other end of the third link 213 is rotatably connected to one end of the fourth link 214, and the rotational connection is a second movable fulcrum 216, and the other end of the fourth link 214 is pivotally provided.

As shown in fig. 2, in the energy storage state of the energy storage assembly 1, the control assembly 22 abuts against the second movable supporting point 216, an included angle is formed between the third connecting rod 213 and the fourth connecting rod 214, the included angle is smaller than 180 degrees, and the combination of the first connecting rod 211 and the second connecting rod 212 and the third connecting rod 213 are in a supporting state. It can be seen that, in the embodiment of the present application, the reaction force of the driving arm 11 can be converted into a smaller force by the connecting rod assembly 21, so that the control assembly 22 is convenient for controlling the driving arm 11, and the control efficiency of the present application can be effectively improved while the structure is simplified; in addition, due to the arrangement of the connecting rod assembly, the power of the control assembly can be effectively reduced, so that the energy storage assembly can be controlled by using a power supply with smaller power, and further the feathering operation of the blade can be smoothly completed.

Alternatively, as shown in fig. 2 and 3, the control assembly 22 may include a fork 221, a connecting rod 222, a meniscus 223, a trigger coil 224, a first return spring 225, and a second return spring 226.

The shift fork 221 is pivotally disposed at one side of the second movable supporting point 216 through a first return spring 225, two ends of the connecting rod 222 are respectively rotatably connected with the middle part of the shift fork 221 and the meniscus 223, and the meniscus 223 is correspondingly provided with a second return spring 226.

When energy storage is needed, after the first return spring 225 drives the shifting fork 221 to rotate to the first preset position, the shifting fork 221 abuts against the second movable supporting point 216, after the connecting rod 222 drives the meniscus 223 to rotate to the second preset position, the triggering coil 224 adsorbs the meniscus 223 to lock the driving arm 11, and the energy storage component 1 enters an energy storage state as shown in fig. 2.

When the emergency feathering condition is met, the trigger coil 224 releases the meniscus 223, the meniscus 223 is rotated and reset under the action of the second reset spring 226, the connecting rod 222 drives the shifting fork 221 to rotate so as to be separated from the second movable supporting point 216, the driving arm 11 is driven by the elastic piece 12 to apply work, the energy storage component 1 enters an energy release state, and the energy storage component 1 enters an energy release completion state as shown in fig. 3 after being released.

Therefore, in the embodiment of the application, the control component adopts the arrangement, and can realize the locking or releasing action of the driving arm only by controlling the trigger coil through smaller current, so that the device has a simple structure and is easy to use, and the feathering can be completed through elastic potential energy release under any condition because the device does not need to use larger current for driving, and the usability and safety of the device are greatly improved.

Alternatively, as shown in fig. 2, in the energy storage state of the energy storage assembly 1, the third link 213 and the first link 211 respectively form two sides of the first triangle; the third connecting rod 213 and the second connecting rod 212 respectively form two sides of the second triangle; the third connecting rod 213 and the fourth connecting rod 214 respectively form two sides of a third triangle; the connection lever 222 and the shift fork 221 respectively form two sides of the fourth triangle, and the connection lever 222 and the fourth link 214 are in a parallel state. The link assembly 21 is arranged in a plurality of triangular ways, so that the force on the second movable supporting point can be further reduced, and the control assembly is convenient for controlling the driving arm.

Optionally, as shown in fig. 2 and 3, in the feathering device of the wind generating set according to the embodiment of the present application, the control mechanism 2 further includes a travel switch 23, the travel switch 23 is abutted to the shift fork 221, and the state of the energy storage assembly 1 is detected by detecting the rotation of the shift fork 221. The travel switch 23 may specifically be disposed below the shift fork 221 and abuts against the shift fork 221, and in use, the travel switch 23 may be connected to a controller, for example, a controller of a pitch system, and when the energy storage assembly 1 stores energy, a command is sent to the controller to monitor the state of the energy storage assembly 1.

Alternatively, as shown in fig. 2 and 3, the feathering apparatus 100 may further include a manual energy storage unit 4, where the manual energy storage unit 4 includes a driving wheel 41 and an energy storage link 42, and the energy storage link 42 is disposed between the driving wheel 41 and the control end 112, and the energy storage assembly 1 is brought into an energy storage state by rotating the driving wheel 41.

Specifically, the driving wheel 41 may specifically include an operating wheel 411 and a driving wheel 412, where the operating wheel 411 and the driving wheel 412 are arranged in parallel and meshed, a coaxial ratchet wheel is further disposed on the driving wheel 412, and the driving wheel 412 is in transmission connection with the control end 112 through an energy storage link. When in use, the operation wheel 411 can be operated, so that the driving wheel 412 can be driven to further drive the driving arm 11 to slide so as to finish the energy storage of the energy storage component 1. The manual energy storage unit is mainly arranged, so that maintenance personnel can conveniently overhaul equipment, and the difficulty of equipment maintenance can be effectively reduced, thereby greatly reducing the maintenance difficulty and the maintenance cost of the equipment. Of course, the manual energy storage unit is not necessarily set in the above-mentioned manner, and may be set in other manners, which is not limited to this embodiment.

Alternatively, the feathering apparatus 100 may further include a damper 5, the damper 5 being provided on the driving arm 11 and being provided on a side close to the control end 112.

Specifically, as shown in fig. 2 and 3, the damper 5 may be a hydraulic damper, the piston of the damper 5 may be fixedly disposed at the rear portion of the driving arm 11, that is, at a position close to the control end 112, the cylinder of the damper 5 may be fixedly disposed, and the wall of the damper cylinder may be distributed with pressure release channels with different apertures. When the hydraulic damper is used, the driving arm starts to retract under the action of strong elastic force, and simultaneously, the hydraulic damper can damp in a variable mode, so that the feathering process is flatter, damage to blades, a variable-pitch bearing and other parts is avoided, and the safety of the hydraulic damper is effectively improved.

It should be noted that, the present application is not limited to the specific embodiment of the damper, for example, in other embodiments, the damper may be an air damper, and the present application is not limited thereto, and a person skilled in the art may adjust the damper according to the actual working condition.

Alternatively, as shown in fig. 1 to 4, the driving mechanism 3 includes a driving shaft 31 and two driving links 32, the driving shaft 31 is disposed concentrically with the pitch bearing 205, the two driving links 32 are disposed at intervals along the circumference of the driving shaft 31, and the axes of the two driving links 32 are disposed radially perpendicularly to the driving shaft 31.

Optionally, the driving end 111 of the driving arm 11 is provided with a sliding rail 1111, and the sliding rail 1111 is tangential to the blade circumference; the ends of the two driving links 32 are respectively connected with the slide rail 1111 in a transmission way through a transmission shaft, and the ends of the two driving links 32 are respectively provided with a waist hole for the transmission shaft to slide. Specifically, the driving shaft 31 may be disposed on the pitch bearing 205 through a bearing disc (not shown), and the driving shaft 31 is disposed concentrically with the bearing disc and the pitch bearing, and the bearing disc may have a circular plate-like structure, and an outer edge thereof may be connected to an inner sidewall of the pitch bearing 205.

When the energy storage device is used, the blades are driven by the pitch system to perform pitch opening, the driving shaft 31 rotates along with the pitch system, the driving connecting rod 32 close to the driving end 111 can drive the driving arm 11 to slide through the sliding rail 1111, and after the pitch system finishes pitch, the energy storage assembly 1 also finishes energy storage action; when feathering is needed, the driving arm 11 starts to slide under the driving of the elastic piece 12, so that the driving connecting rod 32 is driven to act, and the feathering action of the blades is finished. By arranging the driving structure, the energy storage device can finish energy storage in the process of pitching the blades, so that resources can be effectively saved, and the use and maintenance cost can be greatly reduced. The present application is not limited to the specific embodiment of the driving mechanism 3, and those skilled in the art may choose the driving mechanism according to the actual situation.

As shown in fig. 2 and 3, the energy storage process of the present application has two modes: the variable-pitch bearing is driven by the variable-pitch system, the driving shaft drives the driving arm to finish energy storage, the bottom end of the movable part of the shifting fork is contacted with the travel switch in the energy storage process, and the travel switch is converted into closed by the opening of the electrical signal contact and is collected by the variable-pitch system controller when the energy storage is finished. When the pitch control device needs maintenance, overhaul or artificial energy storage, the operation wheel can be shifted through a pressure lever so as to drive the driving wheel, the driving wheel is provided with a coaxial ratchet wheel, and the driving arm is pushed by the energy storage connecting rod on the driving wheel to compress the elastic piece until the driving wheel completes 90-degree rotation and returns to the initial state under the action of the first and second reset springs.

Based on the same inventive concept, as shown in fig. 1 to 5, a second aspect of the present application further provides a pitch system of a wind turbine, comprising: feathering equipment, a controller 201, a driver 202, a pitch motor 203, a pitch reducer 204 and a pitch bearing 205 of the wind turbine as in the previous embodiments;

the controller 201 is electrically connected with the driver 202 and is used for outputting a pitch angle control signal;

the driver 202 is electrically connected with the pitch motor 203, and is used for outputting pitch voltage to the pitch motor 203 according to a pitch angle control signal;

the pitch motor 203 is in transmission connection with the pitch reducer 204, and is used for outputting a rotating torque to the pitch reducer 204 according to the pitch voltage;

The pitch reducer 204 is in transmission connection with the pitch bearing 205, and is used for driving the pitch bearing 205 to rotate according to the rotation torque;

The variable-pitch bearing 205 is in transmission connection with the feathering device and is used for providing mechanical energy for the feathering device by utilizing self rotation;

The controller 201 is electrically connected with the feathering device and is used for controlling the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the variable-pitch bearing 205, so that the variable-pitch bearing 205 feathers the blades.

Alternatively, as shown in fig. 1 to 5, a pitch bearing 205 in the pitch system of the present application is in transmission connection with a driving mechanism 3 in the feathering device, and is used for driving a driving arm 11 in the feathering device to squeeze an elastic member 12 in the feathering device by using self rotation;

The controller 201 is electrically connected with the control mechanism 2 in the feathering device, and is used for controlling the control mechanism 2 to lock the driving arm 11 in a state of extruding the elastic piece 12, so that the energy storage component 1 in the feathering device enters an energy storage state;

the controller 201 is configured to control the control mechanism 2 to release the driving arm 11 when the emergency feathering condition is met, so that the driving arm 11 drives the driving mechanism 3 to drive to the pitch bearing 205 under the rebound action of the elastic member 12, so that the pitch bearing 205 feathers the blade, and the energy storage component 1 enters the energy release state.

Alternatively, as shown in fig. 1 to 5, the pitch system of the present application further comprises an overspeed switch 206, the overspeed switch 206 being arranged in the hub 301 and being electrically connected to the control mechanism 2 for controlling the control mechanism 2 to release the drive arm 11 when the blade rotational speed exceeds a preset threshold value.

As shown in fig. 1 to 5, the pitch system of the wind turbine of the present application may include a pitch bearing 205, a driving shaft 31, a driving link 32, and an energy storage assembly 1 mounted with a hub. When the wind generating set is in a stop state, the blade pitch angle is in a 87-degree feathering completion state, and the energy storage assembly 1 is in an energy storage-free state. When the wind generating set is ready for grid-connected operation, the pitch system can control the pitch motor 203 to rotate towards the 0-degree position of pitch through the driver 202, the pitch motor 203 drives the pitch speed reducer 204 to operate, the pitch speed reducer 204 drives the pitch bearing 205 and the blades to rotate towards the 0-degree position through the gears or the toothed belts, the driving shaft 31 and the driving connecting rod 32 are driven to move while the pitch bearing 205 rotates, the moving driving connecting rod 32 drives the elastic piece 12 to gradually compress the elastic piece 11 through sliding pulling the driving arm of the spring energy storage system, and when the pitch motor 203 drives the pitch bearing 205 to rotate the blades to the 0-degree position, the energy storage assembly 1 also gradually completes energy storage from a state without energy storage as shown in fig. 3 to a state as shown in fig. 2. In the energy storage process, the connecting rod assembly 21 supporting the elastic member 12 is gradually opened, when the first movable supporting point 215 and the second movable supporting point 216 are pulled up to a preset position, the supporting point is jacked up by the shifting fork 221 under the action of the second return spring 226, the meniscus 223 also slides clockwise to a preparation triggering state under the action of the first return spring 225, and the energy storage is completed. The travel switch 23 sends a status bit signal of the completion of the energy storage to the controller. When the emergency feathering is needed due to the failure of the pitching, the controller 201 sends a feathering state indication command, the electromagnetic brake of the pitching motor 203 is loosened due to the loss of the control high level, the trigger coil 224 acts simultaneously, the armature triggers the meniscus 223, the meniscus 223 rotates anticlockwise under the action of the first reset spring 225, the triangular pivot of the connecting rod assembly 21 is out of stable balance state, the first movable pivot 215 and the second movable pivot 216 slide, the elastic piece 12 releases the elastic force instantly, and the driving arm 11 pulls the driving connecting rod 32 to move towards the direction of the blade 90 degrees until the blade feathers to the safe position.

As shown in fig. 5, in an embodiment of the present application, a hub 301 includes a pitch cabinet, a pitch motor 203, a pitch reducer 204, a transmission device, a pitch bearing 205, a driving link 32, and an energy storage assembly 1, where the pitch cabinet mainly includes a charger 209 and a driver 202, a power line of the driver 202 is connected with a junction box of the pitch motor 203, the pitch motor 203 is installed on the pitch reducer 204, the pitch reducer 204 is connected with a bracket of the hub 301, and the transmission device can reduce the rotation speed of the input pitch reducer 204, increase the torque, and transmit the torque to the pitch bearing 205 and blades. The pitch bearing 205 drives the bearing plate 207 and the driving link 32 to act, the energy storage assembly 1 is fixed on the support 302 of the hub 301, the driving link 32 and the driving arm 11 can be connected through a sliding bearing, and the driving arm 11 gradually compresses the elastic piece 12 under the pulling of the driving link and completes the energy storage action.

The energy storage assembly 1 may be mounted above the pitch bearing 205 and bearing disk 207, in connection with the hub 301. In the stored energy state, i.e. the blade is in an angular position of 0 degrees. The trigger coil 224 is controlled by the controller 201 and the overspeed switch 206 in parallel, after the control signal is sent, the logic level of the pitch system 24V becomes low level, the armature action of the trigger coil 224 induces the meniscus 223 to rotate and slide anticlockwise, and the fulcrum of the shifting fork 221 moves downwards after losing the supporting balance. The link assembly 21 loses the triangular static balance support, and the drive arm 11 starts to retract under the strong elastic force, accompanied by the restriction of the variable damping of the damper 5. The pitch speed of the control blade driven by the drive arm 11 to drive the drive link is limited to a relatively stable value until the blade is driven back to the 87 degree safe position.

In the embodiment of the application, the pitch system mainly provides constant-voltage direct current and/or alternating current for the driver 202 by the pitch charger 209, the driver 202 inverts the pitch charger 209 into alternating current with variable voltage and frequency to control the pitch motor 203, an encoder 208 and an electromagnetic brake 2031 are arranged behind the pitch motor 203, the rotating torque is output to the pitch bearing 205, the real-time running speed of the blade is fed back by the encoder 208, and the pitch bearing 205 is connected with the energy storage component 1. During operation, the controller 201 controls the driver 202 to drive the blades to rotate, and sends normal or abnormal status bits to the electromagnetic brake 2031 and the trigger coil 224 of the pitch motor 203. When emergency feathering occurs, the controller 201 gives a signal that the electromagnetic brake 2031 is released, and the electromagnetic brake 2031 of the pitch motor 203 is released. The trigger coil 224 is turned over and the armature moves, and the elastic force of the elastic member 12 acts to drive the blade 307 to feather. When the controller 201, the driver 202, the variable pitch motor 203 and other devices have problems, the blades absorb wind energy under the continuous wind force effect, the rotation speed of the impeller is gradually increased, after the rotation speed of the impeller is increased to the limit value of the overspeed switch 206, the overspeed switch 206 acts and triggers the energy storage component 1 to execute feathering action, the last protection of emergency feathering is completed, the stall of the wind turbine is protected, and the operation safety of the wind turbine can be improved.

As shown in fig. 6, in the implementation of the present application, the controller 201 may control the control mechanism 2, which is connected to the driver 202 and the feathering apparatus 100 in sequence, to output. In the energy storage stage of the energy storage component 1, the driver 202 controls the pitch motor 203 to drive the pitch reducer 204, so as to drive the pitch bearing 205 and the blades, and the driving link 32 drives the driving arm 11 to act and compress the elastic piece 12, so that the energy storage of the energy storage component 1 is completed. In the normal operation stage, the control mechanism 2 is in a state waiting for triggering, the controller 201 sends out a control command, and the driver 202 drives the pitch motor to output to the pitch bearing 205 to rotate within the range of 0-90 degrees. In the normal feathering stage, the controller 201 controls the variable pitch bearing 205 to feathere the blades preferentially, and the control mechanism 2 waits for triggering; in the emergency feathering stage, the controller 201 sends out a control instruction, and the control mechanism 2 drives the variable-pitch bearing 205 to rotate by controlling the energy storage component 1, so as to drive the blades to feathere.

Based on the same inventive concept, as shown in fig. 1 to 6, a third aspect of the present application further provides a wind turbine generator set, which may include the pitch system of the wind turbine generator set provided by the embodiment of the present application.

Based on the same inventive concept, the fourth aspect of the present application further provides a pitch method for a pitch system of a wind turbine generator set provided by the embodiment of the present application, a flow chart of the method is shown in fig. 7, and the method includes:

s601, the controller 201 outputs a pitch angle control signal to the driver 202.

S602, the driver 202 outputs a pitch voltage to the pitch motor 203 according to the pitch angle control signal.

S603, the pitch motor 203 outputs a rotational torque to the pitch reducer 204 according to the pitch voltage.

S604, the pitch reducer 204 drives the pitch bearing 205 to rotate according to the rotation torque.

S605, the pitch bearing 205 provides mechanical energy for the feathering apparatus by rotating itself.

The variable-pitch bearing 205 drives the driving arm 11 in the feathering device to extrude the elastic piece 12 in the feathering device by utilizing the rotation of the variable-pitch bearing.

S606, the controller 201 controls the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the variable-pitch bearing 205, so that the variable-pitch bearing 205 feathers the blades.

Optionally, the controller 201 controls the control mechanism 2 to lock the driving arm 11 in a state of pressing the elastic member 12, so that the energy storage assembly 1 in the feathering device enters an energy storage state; and

When the controller 201 accords with the emergency feathering condition, the control mechanism 2 is controlled to release the driving arm 11, so that the driving arm 11 drives the driving mechanism 3 to drive to the pitch bearing 205 under the rebound action of the elastic piece 12, the pitch bearing 205 feathers the blades, and the energy storage component 1 enters the energy release state.

Optionally, the controller 201 controls the control mechanism 2 to lock the driving arm 11 in a state of pressing the elastic member 12, so that the energy storage assembly 1 in the feathering apparatus enters the energy storage state, including:

the driving mechanism 3 is driven by the pitch motor 203, so that the driving arm 11 slides relative to the energy storage cylinder 13 to squeeze the elastic piece 12, when the driving arm 11 slides in place, the first reset spring 225 drives the shifting fork 221 to rotate to a first preset position, the shifting fork 221 abuts against the second movable supporting point 216, the connecting rod 222 drives the meniscus 223 to rotate to a second preset position, and the controller 201 controls the trigger coil 224 to absorb the meniscus 223 to lock the driving arm 11, so that the energy storage assembly 1 enters an energy storage state.

Optionally, the control mechanism 2 is controlled to release the driving arm 11, so that the driving arm 11 drives the driving mechanism 3 to drive to the pitch bearing 205 under the rebound action of the elastic member 12, so that the pitch bearing 205 feathers the blade, and the energy storage assembly 1 enters the energy release state, including:

The controller 201 controls the trigger coil 224 to release the meniscus 223, the meniscus 223 rotates and resets under the action of the second reset spring 226, the connecting rod 222 drives the shifting fork 221 to rotate so as to be separated from the second movable supporting point 216, the driving arm 11 is driven by the elastic piece 12 to do work, the energy storage component 1 enters an energy release state, and the driving arm 11 enables the blades to feather through the driving mechanism 3.

Optionally, the pitch method of the embodiment of the present application further includes: when overspeed switch 206 detects that the blade speed exceeds a preset threshold, the feathering arrangement is controlled to enter a de-energized state.

Optionally, the pitch method of the embodiment of the present application further includes: when the control mechanism 2 does not receive the control instruction of the controller 201 within a set period, the control mechanism 2 controls the feathering apparatus to enter an energy release state. Specifically, the controller 201 will send out high potential or low potential to control the trigger coil 224 of the control mechanism 2 under normal state, and the trigger coil 224 is electrically controlled to drive the arm lock; when the controller 201 is in a fault such as a dead halt, the high potential or the low potential sent by the controller 201 can be turned over, and the trigger coil 224 is powered down at the moment, so that the release driving arm is triggered to complete feathering. When the controller is in a dead halt, the feathering device can trigger and release the driving arm to normally finish feathering by using a power-off low-level control logic, so that the reliability of the variable pitch system is higher. In other embodiments, a relay may be disposed between the controller 201 and the control mechanism, and the principle is the same as that of the above embodiments, and will not be described herein.

The operation principle of the pitch method of the application is described below with reference to the accompanying drawings:

As shown in fig. 5, the pitch charger is connected to a driver, which is connected to a pitch motor. The encoder is arranged at the tail part of the variable pitch motor and used for measuring the real-time rotating speed of the variable pitch motor and feeding back the real-time rotating speed to the driver for logic judgment and control. The electromagnetic brake is arranged on the variable-pitch motor and used for keeping the position of the blade, an emergency logic signal of the electromagnetic brake is controlled by the controller, the logic of the electromagnetic brake is power-on contracting brake, and power-off releasing brake. The variable pitch speed reducer is connected with a variable pitch bearing, the variable pitch bearing is connected with a bearing disc, the bearing disc is connected with a driving connecting rod, and the driving connecting rod is connected with an energy storage assembly through a driving arm. Under the condition of emergency feathering, the energy storage component can be directly triggered by the controller to drive the blades to finish feathering; in another embodiment of the application, the controller turns over at a high level in a dead halt state so as to trigger the energy storage component to drive the blade to finish feathering; in the present embodiment of the present application, when the pitch control method of the previous embodiment fails, the rotational speed of the impeller exceeds the set rotational speed value in the stall process by means of an overspeed switch installed in the hub and rotating synchronously, and the overspeed switch acts to trigger the energy storage assembly to drive the blades to complete feathering.

As shown in fig. 6, in the embodiment of the present application, the controller of the pitch system is responsible for monitoring the energy storage state to make a logic judgment. The controller sends out a control command of opening the propeller on the premise of receiving no energy storage, the driver drives the speed reducer and the variable propeller bearing driving disc to move towards the direction of 0 degrees through the driving of the variable propeller motor, the driving connecting rod pushes the driving arm to compress the elastic piece to start energy storage, and the control mechanism feeds back signals to the controller after the energy storage is completed. In addition, the manual energy storage unit can also store energy for the feathering device, and the manual energy storage unit is pressed by external force to enable the operation wheel to rotate and drive the energy storage pull rod on the driving wheel after being transmitted by the gear, so that the driving arm can be pushed to gradually compress the elastic piece to finish energy storage.

In summary, the feathering device, the pitching system and the pitching method of the wind generating set provided by the embodiment of the application have the following beneficial effects:

the first, the application provides a variable pitch system and a variable pitch method which are different from other capacitors/batteries, and the application uses elastic potential energy as backup energy of the variable pitch system as driving, thereby completely avoiding unbalanced direct current voltage caused by other electric energy storage, gradually increasing internal resistance, decreasing capacitance, being incapable of working in hot and low temperature environments and being easy to short-circuit and fire. And the standby power supply is difficult to overhaul and maintain, and the driver and the variable pitch motor are failed in the feathering process, so that the variable pitch system is paralyzed and normal feathering cannot be completed.

Secondly, after the emergency fault of the pitch system occurs, the feathering device can be used as an independent operation unit and is not influenced by a driver and a pitch motor. After the variable pitch system sends out a fault state, the variable pitch motor electromagnetic brake is released after losing 24V power, the system outputs the energy stored by the feathering device of the application in a mechanical energy mode through the trigger coil, and the drive connecting rod feathers the blade to a safe position, so that the reliability and the safety of the application are ensured.

Thirdly, when the position of the blade is 0 degree and the controller is crashed suddenly in the running process of the pitch control system, the feathering device can trigger release of elastic potential energy to normally finish feathering by using a low-level control logic of power failure, so that the reliability of the pitch control system is higher.

Fourth, the drive arm links to each other with the drive connecting rod, and the pitch angle scope of changing the oar bearing rotation point can only be in the slide rail of drive arm, namely the blade pitch angle can only be in 0-90 degree scope operation, and this kind of mode has avoided other like the free 360 degrees rotatory possibility of blade completely, has stopped the blade to drive the emergence that changes the free rotation of oar bearing and lead to the apex to sweep the tower phenomenon.

Fifth, because the energy storage mode of the embodiment of the application is that the energy storage of the elastic piece can be completed by utilizing the driving force of the variable pitch motor in the blade pitch process, the resultant force of the blade force and the gravity of the blade itself can be fully utilized in the emergency feathering process, the design volume of the elastic piece can be greatly reduced, the energy storage component can be smaller, and the structure is simpler and more reliable. Therefore, the safe feathering of the blade can be realized without adding additional mechanical devices and energy storage equipment. In addition, the manual energy storage unit can provide convenience for debugging and maintenance personnel maintenance operation of the pitch system.

The sixth, the application provides the multiple safe protection feathering method at the same time, first, when the controller, the driver, or the variable pitch motor fails to feathering normally, the variable pitch system sends the power-off signal to the feathering device. If the signal of the controller is interfered, the rotating speed of the blade is faster and faster under the action of external wind force, and after the blade reaches the set speed of the overspeed switch, the overspeed switch is disconnected with the control signal to forcedly trigger the feathering device so as to finish feathering to become the final safety protection.

In addition, the embodiment of the application changes the conventional and complex layout mode of the pitch system from the design source, and thoroughly avoids the phenomena of overcurrent and incapability of segmented charging of the charger in the process of charging the super capacitor. The embodiment of the application can enable the efficiency of the charger to be higher, and does not need to use a capacitor or a battery as a standby power scheme. The variable pitch cabinet can develop towards the direction of integration and high power density, and the volume of a variable pitch system can be smaller; the embodiment of the application reduces the fault points of the emergency feathering system and avoids the problem of blockage caused by the fault of the electrical system; according to the embodiment of the application, as a plurality of safety protection methods are provided, the emergency feathering success rate of the variable pitch system is improved, and the reliability of the unit is improved. Furthermore, the feathering device solves the problems of self failure, complex maintenance, running overhaul danger and the like of the standby power system of the traditional variable pitch system.

Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.

Claims

1. The feathering device of the wind generating set comprises a hub (301) and a variable pitch bearing (205), and is characterized in that the feathering device (100) is fixedly arranged in the hub (301), and the feathering device (100) comprises an energy storage component (1), a control mechanism (2) and a driving mechanism (3);

The energy storage assembly (1) comprises a driving arm (11), an elastic piece (12) and an energy storage cylinder (13); the elastic piece (12) is fixedly connected in the energy storage cylinder (13), and one end of the elastic piece (12) is opposite to the driving arm (11); the driving arm (11) penetrates through the energy storage cylinder (13), and the driving arm (11) can slide relative to the energy storage cylinder (13);

The driving end (111) of the driving arm (11) is in transmission connection with the driving mechanism (3), and the control end (112) of the driving arm (11) is connected with the control mechanism (2); the driving mechanism (3) is arranged on the variable-pitch bearing (205);

The driving arm (11) is used for extruding the elastic piece (12) under the drive of the driving mechanism (3), and the control mechanism (2) is used for locking the driving arm (11) in a state of extruding the elastic piece (12) so that the energy storage assembly (1) is in an energy storage state; and releasing the driving arm (11) when the emergency feathering condition is met, so that the driving arm (11) drives the driving mechanism (3) to feathering the blades under the rebound action of the elastic piece (12), and the energy storage assembly (1) enters an energy release state.

2. The feathering device of a wind generating set according to claim 1, wherein the driving arm (11) is fixedly provided with a bottom plate (113), the bottom plate (113) is slidably arranged in the energy storage cylinder (13), one end of the elastic member (12) is fixed on a cylinder cover of the energy storage cylinder (13), the other end of the elastic member is opposite to the bottom plate (113), and the driving arm (11) is used for sliding relative to the energy storage cylinder (13), so that the bottom plate (113) extrudes the elastic member (12) under the driving of the driving arm (11).

3. The feathering apparatus of a wind turbine generator system according to claim 2, wherein the number of the elastic members (12) is plural, a plurality of layers of bosses (114) are oppositely arranged on the bottom plate (113) and the cylinder cover, and the plurality of elastic members (12) are sequentially arranged corresponding to the plurality of layers of bosses (114).

4. Feathering apparatus of a wind turbine according to claim 1, wherein the control mechanism (2) comprises a link assembly (21) and a control assembly (22), the link assembly (21) being connected to the control end (112) of the drive arm (11), the control assembly (22) being adapted to lock or release the drive arm (11) by controlling the link assembly (21).

5. Feathering apparatus of a wind turbine according to claim 4, wherein the linkage assembly (21) comprises a first linkage (211), a second linkage (212), a third linkage (213) and a fourth linkage (214);

one end of the first connecting rod (211) is rotationally connected with the control end (112);

One end of the second connecting rod (212) is pivotally connected with the other end of the first connecting rod (211) and one end of the third connecting rod (213), a first movable supporting point (215) is formed at the pivot connection part, and the other end of the second connecting rod (212) is pivotally arranged;

The other end of the third connecting rod (213) is pivotally connected with one end of the fourth connecting rod (214), the pivot connection is a second movable supporting point (216), and the other end of the fourth connecting rod (214) is pivotally arranged;

the energy storage assembly (1) is in an energy storage state, the control assembly (22) is propped against the second movable supporting point (216), an included angle is formed between the third connecting rod (213) and the fourth connecting rod (214), the included angle is smaller than 180 degrees, and the combination of the first connecting rod (211) and the second connecting rod (212) and the third connecting rod (213) are in a supporting state.

6. Feathering apparatus of a wind turbine as claimed in claim 5, wherein the control assembly (22) comprises a fork (221), a connecting rod (222), a meniscus (223), a trigger coil (224), a first return spring (225) and a second return spring (226);

The shifting fork (221) is pivoted on one side of the second movable supporting point (216) through a first reset spring (225),

Two ends of the connecting rod (222) are respectively connected with the middle part of the shifting fork (221) and the meniscus (223) in a rotating way,

The meniscus (223) is correspondingly provided with a second return spring (226);

When energy storage is needed, after the first reset spring (225) drives the shifting fork (221) to rotate to a first preset position, the shifting fork (221) props against the second movable supporting point (216), after the connecting rod (222) drives the meniscus (223) to rotate to a second preset position, the triggering coil (224) adsorbs the meniscus (223) to lock the driving arm (11), and the energy storage component (1) enters an energy storage state;

When the emergency feathering condition is met, the trigger coil (224) releases the meniscus (223), the meniscus (223) rotates and resets under the action of a second reset spring (226), the connecting rod (222) drives the shifting fork (221) to rotate so as to separate from the second movable supporting point (216), the driving arm (11) does work under the driving of the elastic piece (12), and the energy storage assembly (1) enters an energy release state.

7. Feathering apparatus of a wind turbine according to claim 6, wherein the control mechanism (2) further comprises a travel switch (23), the travel switch (23) being in abutment with the fork (221) for detecting the state of the energy storage assembly (1) by detecting the rotation of the fork (221).

8. Feathering apparatus of a wind turbine according to claim 1, wherein the feathering apparatus (100) further comprises a manual energy storage unit (4), the manual energy storage unit (4) comprises a driving wheel (41) and an energy storage connecting rod (42), the energy storage connecting rod (42) is arranged between the driving wheel (41) and the control end (112), and the energy storage assembly (1) is brought into an energy storage state by rotating the driving wheel (41).

9. Feathering apparatus of a wind turbine according to claim 1, wherein the driving mechanism (3) comprises a driving shaft (31) and two driving links (32), the driving shaft (31) is arranged concentrically with the pitch bearing (205), the two driving links (32) are arranged at intervals along the circumferential direction of the driving shaft (31), and the axes of the two driving links (32) are arranged radially perpendicularly to the driving shaft (31).

10. Feathering apparatus of a wind turbine according to claim 9, wherein the driving end (111) of the driving arm (11) is provided with a sliding rail (1111), which sliding rail (1111) is tangential to the blade circumference; the end parts of the two driving connecting rods (32) are respectively connected with the sliding rail (1111) in a transmission way through a transmission shaft, and waist holes for the transmission shafts to slide are formed in the end parts of the two driving connecting rods (32).

11. Feathering apparatus of a wind turbine according to claim 1, wherein the driving arm (11) extends through the energy storage cylinder (13) and the elastic element (12).

12. Feathering apparatus of a wind turbine according to claim 1, wherein the feathering apparatus (100) further comprises a damper (5), the damper (5) being arranged on the drive arm (11) at a side close to the control end (112).

13. A pitch system for a wind turbine, comprising: feathering arrangement of a wind park according to any one of claims 6 to 7, a controller (201), a drive (202), a pitch motor (203), a pitch reducer (204) and a pitch bearing (205);

the controller (201) is electrically connected with the driver (202) and is used for outputting a pitch angle control signal;

the driver (202) is electrically connected with the pitch motor (203) and is used for outputting pitch voltage to the pitch motor (203) according to the pitch angle control signal;

The pitch motor (203) is in transmission connection with the pitch reducer (204) and is used for outputting a rotating torque to the pitch reducer (204) according to the pitch voltage;

The pitch reducer (204) is in transmission connection with the pitch bearing (205) and is used for driving the pitch bearing (205) to rotate according to the rotation torque;

the variable-pitch bearing (205) is in transmission connection with the feathering device and is used for providing mechanical energy for the feathering device by utilizing self rotation;

The controller (201) is electrically connected with the feathering device and is used for controlling the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the pitch bearing (205) so that the pitch bearing (205) feathers the blades.

14. A pitch system of a wind turbine according to claim 13,

The variable-pitch bearing (205) is in transmission connection with a driving mechanism (3) in the feathering device and is used for driving a driving arm (11) in the feathering device to extrude an elastic piece (12) in the feathering device by using self rotation;

the controller (201) is electrically connected with a control mechanism (2) in the feathering device and is used for controlling the control mechanism (2) to lock the driving arm (11) in a state of extruding the elastic piece (12) so that the energy storage component (1) in the feathering device enters an energy storage state;

The controller (201) is used for controlling the control mechanism (2) to release the driving arm (11) when emergency feathering conditions are met, so that the driving arm (11) drives the driving mechanism (3) to drive to the pitch bearing (205) under the rebound action of the elastic piece (12), the pitch bearing (205) feathers blades, and the energy storage assembly (1) enters an energy release state.

15. A pitch system of a wind power plant according to claim 14, further comprising an overspeed switch (206), said overspeed switch (206) being arranged in the hub (301) and being electrically connected to said control means (2) for controlling said control means (2) to release said drive arm (11) when said blade rotational speed exceeds a preset threshold value.

16. A pitch method of a pitch system for a pitch system of a wind turbine according to claim 14 or 15, comprising:

the controller (201) outputs a pitch angle control signal to the driver (202);

the driver (202) outputs a pitch voltage to a pitch motor (203) according to the pitch angle control signal;

the pitch motor (203) outputs a rotational torque to the pitch reducer (204) according to the pitch voltage;

The variable-pitch speed reducer (204) drives a variable-pitch bearing (205) to rotate according to the rotation torque;

The variable-pitch bearing (205) provides mechanical energy for the feathering device by utilizing self rotation;

a controller (201) controls the feathering device with mechanical energy to enter an energy storage state; and when the emergency feathering condition is met, controlling the feathering device to enter an energy release state, and releasing the stored mechanical energy to the pitch bearing (205) so that the pitch bearing (205) feathers the blades.

17. The pitching method of claim 16, wherein the pitching bearing (205) provides mechanical energy to the feathering means using self rotation, comprising:

the variable-pitch bearing (205) drives a driving arm (11) in the feathering device to extrude an elastic piece (12) in the feathering device by utilizing self rotation; and

The controller (201) controls the feathering arrangement with mechanical energy into an energy storing state comprising:

the controller (201) controls the control mechanism (2) to lock the driving arm (11) in a state of extruding the elastic piece (12), so that the energy storage component (1) in the feathering device enters an energy storage state; and

When the emergency feathering condition is met, the feathering device is controlled to enter an energy release state, stored mechanical energy is released to the variable pitch bearing (205), so that the variable pitch bearing (205) feathers the blades, and the method comprises the following steps:

When the controller (201) accords with an emergency feathering condition, the control mechanism (2) is controlled to release the driving arm (11), so that the driving arm (11) drives the driving mechanism (3) to drive to the pitch bearing (205) under the rebound action of the elastic piece (12), the pitch bearing (205) feathers blades, and the energy storage assembly (1) enters an energy release state.

18. A pitching method according to claim 17, wherein the controller (201) controls the control mechanism (2) to lock the driving arm (11) in a state of pressing the elastic member (12) such that the energy storage assembly (1) in the feathering apparatus enters an energy storage state, comprising:

The driving mechanism (3) is driven by the variable pitch motor (203), the driving arm (11) slides relative to the energy storage cylinder (13) to extrude the elastic piece (12), when the driving arm (11) slides in place, the first reset spring (225) drives the shifting fork (221) to rotate to a first preset position, the shifting fork (221) abuts against the second movable supporting point (216), the connecting rod (222) drives the meniscus (223) to rotate to a second preset position, the controller (201) controls the trigger coil (224) to adsorb the meniscus (223) to lock the driving arm (11), and the energy storage assembly (1) enters an energy storage state.

19. A pitching method according to claim 18, wherein said controlling said control mechanism (2) to release said driving arm (11) such that said driving arm (11) drives said driving mechanism (3) to drive to said pitch bearing (205) under the resilience of said resilient member (12), such that said pitch bearing (205) feathers the blade and such that said energy storage assembly (1) enters a released state, comprising:

The controller (201) controls the trigger coil (224) to release the meniscus (223), the meniscus (223) rotates to reset under the action of a second reset spring (226), the connecting rod (222) drives the shifting fork (221) to rotate so as to separate from the second movable supporting point (216), the driving arm (11) does work under the driving of the elastic piece (12), the energy storage assembly (1) enters an energy release state, and the driving arm (11) enables the blade feathering through the driving mechanism (3).

20. A method of pitching as defined in claim 16, further comprising: and when the overspeed switch (206) detects that the rotating speed of the blade exceeds a preset threshold value, controlling the feathering device to enter an energy release state.

21. The pitching method of claim 16, further comprising: when the control mechanism (2) does not receive the control instruction of the controller (201) within a set period, the control mechanism (2) controls the feathering device to enter an energy release state.