CN107939600A - Wind generating set, feathering method thereof and computer storage medium - Google Patents

Abstract

Embodiments of the present invention provide a wind turbine, a feathering method of the wind turbine, and a computer storage medium. The wind turbine includes a wind wheel and a nacelle. The wind wheel includes a hub and blades, and a pitch changing system is provided in the hub. It also includes: a low-voltage generator located in the hub and/or in the engine room; a low-voltage generator used to generate electricity using the mechanical energy of the rotation of the wind wheel when feathering is required to provide electrical energy for the pitch system; the pitch system, It is electrically connected to the low-voltage generator and used to receive electric energy to run the pitch motor to drive the blade to retract so that the pitch angle of the blade is greater than the preset angle value. Since the low-voltage generator in the embodiment of the present invention uses the mechanical energy of the rotation of the wind wheel to generate electricity and provide electrical energy for the pitch system, even if there is a power outage on the input side of the grid, an abnormal backup power supply, etc., it can still provide power to the pitch system. Provide electrical energy to control the operation of the pitch motor, thereby driving the blades to retract.

Description

Wind power generating set, its feathering method, and computer storage medium

technical field

The invention relates to the technical field of wind power generation, in particular to a wind power generator set, a feathering method for the wind power generator set, and a computer storage medium.

Background technique

With the depletion of fossil energy and the seriousness of environmental pollution, wind power, as a new energy source, is in a period of gradual standardization and rapid development. After the Copenhagen World Climate Conference, "low-carbon and environmental protection" has become a global energy development strategy. All countries are taking actions for energy conservation and emission reduction, and have embarked on the road of "new energy".

In large-scale wind turbines, one of the main functions of the pitch system is to control the speed of the wind rotor by controlling the angle of the blades, and then control the output power of the wind turbine; during normal operation of the wind turbine, when the wind speed is lower than the rated wind speed of the unit, The pitch system drives the blades to the 0-degree position for maximum power tracking; when the wind speed exceeds the rated wind speed of the unit, the pitch system keeps the speed of the wind rotor constant by controlling the angle of the blades.

One of the main functions of the pitch control system is to act as the main brake system of the unit. The electric pitch control system ensures the safe and stable operation of the wind turbine through a variety of detection and control methods and multiple redundant designs. Any shutdown caused by a fault will cause the blades to feather. 90 degree position. It can be seen that the pitch control system plays a vital role in the stability and safety of the unit, especially as an aerodynamic brake, the pitch control system must have high reliability and safety.

However, during the operation of the wind turbine, power failure of the power grid, abnormality of the charger, abnormality of the backup power supply of the pitch system, etc. will occur, and the occurrence of these abnormalities may cause the blades of the wind turbine to be unable to retract to a safe position ( For example, the pitch angle is 88 degrees); especially in the case of power failure and abnormality of the backup power supply, the degree of danger is higher for the electric pitch system; if the blades of the wind turbine cannot be retracted to a safe position, the Under the action of wind force, the speed of the wind turbine cannot be reduced, causing the wind turbine to overspeed or even the danger of speeding.

At present, there is no better control method for wind turbine blades that cannot retract their propellers. Only by leeward yaw, that is, by yawing, the wind turbine yaws 90 degrees and deviates from the wind direction, thereby reducing the speed of the wind turbine and realizing However, the disadvantage of this method is that during normal operation, the wind turbine can absorb the maximum wind energy by turning the blade pitch angle to 0 degrees, that is, the force-bearing surface of the blade is perpendicular to the wind direction; In the process of shutting down and retracting the blades, the pitch angle of the blades will gradually increase, so that the wind energy absorbed by the blades will decrease, and the speed will decrease. After retracting the propeller), instead, the stressed surface of the blade will be perpendicular to the wind direction again, and the force on the blade will be increased again. This situation, on the one hand, will cause the speed of the wind turbine rotor to drop slowly, on the other hand, it will also cause the The wind turbine bears a greater load, which is not conducive to the safety of the wind turbine.

To sum up, in the prior art, when the power grid fails, the charger is abnormal, the backup power of the pitch control system is abnormal, or the power grid fluctuates and the device is damaged or burned, the blades of the wind turbine cannot be retracted. The speed of the wind turbine cannot be reduced, causing the wind turbine to overspeed or even the danger of speeding.

Contents of the invention

In view of this, the present invention aims to provide a wind power generating set, a method for feathering a wind generating set, and a computer storage medium, so as to solve problems in the prior art when the power grid fails, the charger is abnormal, and the backup power of the pitch system is abnormal. 1. When the power grid fluctuates and the device is damaged or burned, the blades of the wind turbine cannot be retracted.

In order to achieve the above object, the present invention provides the following technical solutions:

A wind power generating set, comprising: a wind rotor and a nacelle, the wind rotor includes a hub and blades, the hub is provided with a pitch system, the pitch system includes a pitch motor, and the wind power generating set also includes: a low voltage generator in said hub, and/or located in said nacelle;

The low-voltage generator is used to generate electricity by using the mechanical energy of the wind wheel to provide electric energy for the pitch control system when feathering is required;

The pitch control system is electrically connected to the low-voltage generator, and is used to receive the electric energy, so that the pitch control motor operates to drive the blade to retract, so that the pitch angle of the blade is greater than a preset angle value.

Preferably, the nacelle includes a high-speed shaft and a low-speed shaft, the low-voltage generator is located in the nacelle, and an input end is connected to the high-speed shaft and/or the low-speed shaft.

Preferably, the wind power generating set includes a master controller, and a slip ring located at the connection position between the hub and the nacelle (32);

The output end of the low-voltage generator is electrically connected to the slip ring through a normally open contact;

The main control controller is electrically connected with the normally open contact, and is used for controlling the normally open contact.

Preferably, the pitch system includes: a pitch controller, a DC power supply for the pitch controller, and a frequency converter for powering the pitch motor;

When the low-voltage generator is a DC generator, the output end of the low-voltage generator is electrically connected to the frequency converter through the normally open contact and the slip ring in order to provide power for the frequency converter and the The above DC power supply provides electric energy;

Alternatively, the output end of the low-voltage generator is electrically connected to the pitch motor through the normally open contact and the slip ring in order to provide electric energy for the pitch motor.

Preferably, the pitch system includes a charger;

When the low-voltage generator is an alternator, the output end of the low-voltage generator is electrically connected to the pitch motor through the normally open contact and the slip ring in order to provide power for the pitch motor provide electrical energy; or,

The output end of the low-voltage generator is electrically connected to the three-phase line on the input side of the power grid through the normally open contact and the slip ring in order to provide electric energy for the charger.

Preferably, the wind power generating set further includes a brake release control system, configured to release the brakes of the pitch motor under the control of the main control controller.

Preferably, the brake release control system includes: a brake release solenoid valve, a relay and a brake release branch;

One end of the gate release solenoid valve is electrically connected to the output end of the relay, and the other end is electrically connected to the constant voltage power supply through the gate release branch;

The release branch is provided with a normally closed contact and a first normally open contact;

Both the normally closed contact and the first normally open contact are electrically connected to the main control controller;

The main control controller is used to control the signal at the input end of the relay, so that the relay is energized, and controls the normally closed contact to close, and controls the first normally open contact to close.

Preferably, the brake release control system includes: a brake release solenoid valve, a relay, a redundant relay, a first brake release branch and a second brake release branch;

The first release branch is provided with a normally closed contact and a first normally open contact;

The second release branch is connected in parallel with the first release branch, and is provided with a second normally open contact;

The redundant relay is arranged in parallel with the relay, one end of the release solenoid valve is electrically connected to the output end of the relay and the output end of the redundant relay, and the other end is connected through the first loose end connected in parallel. The gate branch and the second gate release branch are electrically connected to a constant voltage power supply;

The normally closed contact, the first normally open contact and the second normally open contact are all electrically connected to the main control controller;

The main control controller is used to control the signals at the input terminals of the relay and the redundant relay, so that the relay and the redundant relay are energized, and control the closing of the second normally open contact, and control the closing of the second normally open contact. A normally open contact opens, controlling the normally closed contact to open.

A feathering method using the above-mentioned wind turbine, comprising:

controlling the low-voltage generator to be electrically connected to the pitch system, so that the low-voltage generator provides electrical energy for the pitch system;

The operation of the pitch motor included in the pitch control system is controlled to drive the blade to retract, so that the pitch angle of the blade is greater than a preset angle value.

Preferably, the controlling the electrical connection between the low-voltage generator and the pitch system includes:

The main control controller controls the normally open contact to close, so that the output end of the low-voltage generator is electrically connected to the slip ring through the normally open contact.

Preferably, the controlling the electrical connection between the low-voltage generator and the pitch system specifically includes:

When the low-voltage generator is a DC generator,

The main control controller controls the normally open contact to close, so that the output end of the low-voltage generator is electrically connected to the frequency converter through the normally open contact and the slip ring in turn;

Or, the main control controller controls the normally open contact to close, so that the output end of the low voltage generator is electrically connected to the pitch motor through the normally open contact and the slip ring in turn;

When the low-voltage generator is an alternator,

The main control controller controls the normally open contact to close, so that the output end of the low voltage generator is electrically connected to the pitch motor through the normally open contact and the slip ring in turn;

Or, the main control controller controls the normally open contact to close, so that the output end of the low-voltage generator is electrically connected to the three-phase line at the input side of the power grid through the normally open contact and the slip ring in sequence.

Preferably, the control of the operation of the pitch motor included in the pitch system includes:

When the output end of the low-voltage generator is electrically connected to the frequency converter through the normally open contact and the slip ring in turn; or, the output end of the low-voltage generator is sequentially through the normally open contact and the When the slip ring is electrically connected to the three-phase line on the grid input side, the pitch controller included in the pitch system controls the operation of the pitch motor; and

When the output terminal of the low-voltage generator is electrically connected to the pitch motor through the normally open contact and the slip ring in turn, the main control controller controls the pitch motor to loosen through the slip ring. brake.

A computer storage medium, storing a program corresponding to the above feathering method.

Compared with the prior art, the solution of the present invention has the following beneficial effects:

The wind power generating set provided by the embodiment of the present invention includes a low-voltage generator located in the hub and/or in the nacelle. When feathering is required, the low-voltage generator can use the mechanical energy of the wind rotor to generate electricity and provide power for the pitch system. Electric energy, the pitch system receives the electric energy provided by the low-voltage generator, so that the pitch motor operates to drive the blade to retract, so that the pitch angle of the blade is greater than the preset angle value. Compared with the prior art, since the low-voltage generator in the embodiment of the present invention utilizes the mechanical energy of the wind wheel to generate electricity and provides electric energy for the pitch system, even if the grid input side loses power, the charger is abnormal, and the backup power supply In the event of abnormal conditions such as device damage or burnout caused by power grid fluctuations, the embodiment of the present invention can still provide electric energy for the pitch control system. The pitch angle is greater than the preset angle value, thereby enabling the speed of the wind turbine to drop rapidly, effectively avoiding the risk of overspeeding or even speeding of the wind turbine; when the speed of the wind turbine drops to a certain level, due to low pressure The generator uses the mechanical energy of the wind wheel to generate electricity. At this time, the output voltage of the low-voltage generator is reduced, which is not enough to provide electric energy for the pitch control system. At this time, the blades are still in a safe position, and the feathering of the wind turbine is completed.

Moreover, the low-voltage generator in the embodiment of the present invention is located in the engine room, and the input end of the low-voltage generator is connected with the high-speed shaft and/or the low-speed shaft, so that the low-voltage generator in the embodiment of the present invention can be driven by the high-speed shaft or the low-speed shaft Power generation, that is, the use of the blade's own rotational force to generate power, so there is no need to add additional energy storage or mechanical devices, so the system is simple in structure, low in cost, and easy to transform and realize.

In addition, since the wind power generating set provided by the embodiment of the present invention also includes a brake release control system, which is used to release the brake of the pitch motor under the control of the main control controller, so that when the power grid fails, the charger is abnormal, the inverter When the backup power supply of the propeller system is abnormal, or the power grid fluctuates, causing device damage or burnout, etc., the main control controller can release the brake of the pitch motor by controlling the work of the brake release control system, and then complete the subsequent process of retracting the propeller.

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

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural schematic diagram of the control system of existing wind power generator;

Fig. 2 is a schematic diagram of a topological structure of an existing pitch system;

Fig. 3 is a structural block diagram of a wind power generating set provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the topological structure of a wind power generating set provided by Embodiment 1 of the present invention;

Fig. 5 is a schematic diagram of a topology structure of a wind power generating set provided by Embodiment 2 of the present invention;

Fig. 6 is a schematic structural diagram of a brake release control system provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of another brake release control system provided by an embodiment of the present invention;

Fig. 8 is a schematic diagram of a topology structure of a wind power generating set provided by Embodiment 3 of the present invention;

Fig. 9 is a flow chart of a feathering method using the above-mentioned wind power generating set provided by an embodiment of the present invention.

The following describes the meanings of the reference signs in the embodiments of the present invention:

101-pitch bearing; 102-reducer gear; 103-azimuth sensor; 104-fan main shaft; 105-reducer; 106-hub; 107-pitch motor; 108-encoder; 109-pitch controller; 110-brake disc; 111-brake valve; 112-master controller; 113-slip ring; 114-blade; 201-backup power supply; 203-inverter; 204-direct current (DC/DC) power supply; side; 209-charger;

31-wind wheel; 32-cabin; 33-pitch system; 301-low voltage generator; 303-normally open contact; 401-pitch drive; 402-brake relay; 405-first normally open contact; Normally closed contact; 61-brake release branch; 408-brake release solenoid valve; 502-relay; 501-relay input terminal;

406-the second normally open contact; 71-the first release branch; 72-the second release branch; 404-redundant relay; 403-input end of redundant relay.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. The expression "and/or" used herein includes all or any elements and all combinations of one or more associated listed items.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with their meaning in the context of the prior art, and unless specifically defined as herein, are not intended to be idealized or overly Formal meaning to explain.

The following first introduces some technical terms used in the embodiments of the present invention.

Pitch Angle (Pitch Angle), also known as pitch angle, wind turbines adopt variable pitch control, and adjust the power by adjusting the windward angle of the blades. The pitch angle refers to the angle between the blade and the plane of the wind wheel; The main purpose of the generator to adjust the pitch angle is:

(1) Start, under the action of wind force, obtain a relatively large torque to drive the blades of the wind turbine to rotate;

(2) Limit the power output, after the rated wind speed, make the power stable, protect the machinery and circuit system, and reduce the load at the same time;

(3) Pneumatic brakes are realized when retracting the propellers, so that the speed of the blades can be reduced rapidly to avoid damage caused by too much inertial force caused by mechanical brakes.

DC generator (DC Generator), DC generator is a machine that converts mechanical energy into DC electrical energy. It is mainly used as a DC motor for DC motors, electrolysis, electroplating, electric smelting, charging and excitation of AC generators. The working principle of the DC generator is to convert the alternating electromotive force induced in the armature coil to the commutation effect of the brush by the commutator, so that it becomes a DC electromotive force when it is drawn out from the brush end, because the brush A passes through the commutation. The electromotive force drawn to the sheet is always the electromotive force in the coil side cutting the N-pole magnetic force line, so the brush A always has a positive polarity; the same reason, the brush B always has a negative polarity, so the direction of the brush end can be drawn out unchanged but the size Varying pulsating electromotive force.

Fast Charger, the charger adopts high-frequency power supply technology and advanced intelligent dynamic adjustment charging technology. It adopts constant current/constant voltage/small constant current intelligent three-stage charging mode, which has high charging efficiency and simple operation. , light weight, small size and so on. For the pitch system, the role of the charger is: when the grid has power, the AC power through the grid supplies power to the charger, and when the charger is working, it charges the backup power.

Backup Power (Backup Power), backup power is a kind of automatic driving quasi-power supply that effectively prevents the drive circuit from having normal voltage, and can extend the voltage required by the circuit to provide the circuit to work normally.

Feathering refers to turning the blades of the wind turbine to a parallel state close to the direction of the wind after the wind turbine fails (also known as the safe position, at a specific angle, it is about 89 degrees to the blades. The position/direction of the propeller retraction) control process. At this time, the wind energy absorbed by the blades of the wind generator is the smallest, which can act as an aerodynamic brake to make the wind generator stop safely.

The inventors of the present invention studied the prior art and found the following problems.

As shown in Figure 1, Figure 1 is the structure of the control system of the wind power generator, which mainly includes: the pitch bearing 101 installed in the hub 106, the speed reducer 105, the pitch motor 107, the encoder 108, and the pitch controller 109; the blade 114 is installed on the pitch bearing 101 through the blade's own bolt, and rotates synchronously with the pitch bearing 101; the pitch controller 109 is used to control the rotation of the pitch motor 107; the pitch motor 107 is installed on the reducer 105 , used to drive the reducer 105 to rotate; the reducer gear 102 meshes with the pitch bearing 101 , the reducer 105 rotates to drive the pitch bearing 101 to rotate, and the pitch bearing 101 is used to drive the blade 114 to rotate.

As shown in Figure 1, the encoder 108 is located at the tail of the pitch motor 107 and is mechanically connected to the rotating shaft of the pitch motor 107 for measuring the angle value of the blade 114; wherein, each blade corresponds to a speed reducer 105 and a pitch motor respectively. 107, the pitch bearing 101 and the pitch controller 109.

As shown in Figure 1, the azimuth sensor 103 is installed on the side of the fan main shaft 104 for measuring the azimuth angle of the hub 106, the brake disc 110 is connected with the fan main shaft 104, and the brake valve 111 is located on both sides of the brake disc 110 for controlling the brake disc. 110 and the braking of the main shaft of the wind turbine 104; the main control controller 112 is used to control the operation of the wind power generator, and control the pitch system to open and close the propellers, and control the release and lock of the brake valve 111; wherein, the main control Between the controller 112 and the pitch controller 109, there are power supply lines, communication lines, safety chain lines, other hardware control lines, etc., and the power supply or electrical signals of these lines are all transmitted through the slip ring 113 .

Specifically, as shown in FIG. 1 , when the wind turbine is running, the hub 106 rotates under the drive of the blades 114, and the main control controller 112 controls the pitch by the slip ring 113 installed on the main shaft 104 of the wind turbine and the hub 106. The system provides power supply, and performs data interaction with the pitch system through the communication cable, controls the operation of the pitch system, and monitors the operation data of the pitch system in time.

As shown in Figure 2, Figure 2 is a schematic diagram of a topological structure of an existing pitch system, specifically including a pitch system using a DC frequency converter, which includes: a backup power supply 201, a pitch motor 107, and a frequency converter 203 , DC (DC/DC) power supply 204, pitch controller 109, grid input side 207 and charger 209; wherein: the effect of backup power supply 201 is to continue to provide power for the pitch motor 107 when the grid input side 207 is abnormal; The frequency converter 203 is used to control the operation of the pitch motor 107 ; the DC/DC power supply 204 is powered by the charger 209 or the backup power supply 201 to provide 24V DC power for the pitch controller 109 .

As shown in Figure 2, the "+" end of the output of the charger 209, the "+" end of the backup power supply 201, and the "+" end of the DC/DC power supply 204 are electrically connected; the "-" end of the output of the charger 209, The "-" terminal of the backup power supply 201 and the "-" terminal of the DC/DC power supply 204 are electrically connected.

The working principle of the existing pitch system is:

(1) Under normal circumstances, the grid input side 207 provides AC power for the charger 209, the charger 209 charges the backup power supply 201, and provides working power for the inverter 203 and DC/DC power supply 204, and the pitch controller 109 is in the main Under the control of the control controller, the pitch control is carried out.

Specifically, as shown in Figures 1 and 2, the implementation method of pitch control is: the pitch controller 109 controls the pitch driver to work, the pitch driver drives the pitch motor 107 to run, and the pitch motor 107 drives the pitch The bearing 101 rotates, and the rotation of the pitch bearing 101 drives the blades 114 mounted on the pitch bearing 101 to rotate, thereby changing the pitch angle of the blades according to control requirements, and realizing the pitch adjustment function.

(2) When the pitch controller 109 detects that the charger 209 is faulty or abnormal, it will control the pitch system to perform a feathering shutdown operation.

During the research process, the inventor found that when the power grid input side 207 is powered off, the charger 209 is abnormal, and the backup power supply 201 is abnormal, the blades of the wind turbine cannot retract the propellers, and under the action of wind force, the wind turbine will The rotational speed cannot be reduced, causing the wind turbine to overspeed or even cause the danger of speeding.

The technical scheme of the present invention will be introduced below in conjunction with the accompanying drawings.

In view of the deficiencies in the prior art, the inventor of the present invention provides a wind power generating set.

As shown in Fig. 3, Fig. 3 is a structural block diagram of a kind of wind generating set specifically provided by the present invention, and this wind generating set comprises: wind wheel 31 and nacelle 32, and wind wheel 31 comprises wheel hub 106 and blade 114, and wheel hub 106 is provided with There is a pitch system 33, and the pitch system 33 includes a pitch motor 107 (not shown in the figure, the specific structure can be referred to in Fig. 1 or shown in Fig. 2 ), the wind wheel 31, the nacelle 32 and the pitch system in the embodiment of the present invention The setting of 33 is similar to the prior art, and will not be repeated here; the setting of the hub 106 and the blade 114 can refer to the setting form of FIG. 1 .

The wind power generating set in the specific embodiment of the present invention also includes other mechanical components and electrical components, and the specific arrangement of these components is all the same as that of the prior art. Since this part does not involve the improvement of the present invention, these components are no longer described here. illustrate.

As shown in FIG. 3 , the wind power generating set specifically provided by the present invention further includes: a low-voltage generator 301 located in the hub 106 and/or in the nacelle 32;

The low-voltage generator 301 is used to generate electricity by using the mechanical energy of the wind wheel 31 to provide electric energy for the pitch system 33 when feathering is required; the pitch system 33 is electrically connected to the low-voltage generator 301 for receiving the low-voltage generator The electric energy provided by 301 makes the pitch motor 107 run to drive the blade 114 to retract, so that the pitch angle of the blade 114 is greater than a preset angle value.

During specific implementation, the pitch motor 107 runs to drive the blade 114 to close the pitch. At this time, the pitch angle of the blade 114 is greater than the preset angle value. The preset angle value in the embodiment of the present invention is the safety of the pitch angle of the blade. position, the angle value at this position is determined according to the actual production situation, for example, it can be 65 degrees, that is, when the pitch angle of the blade 114 is greater than 65 degrees, it can be considered that the wind turbine has completed feathering; of course, the preset angle value Preferably 89 degrees.

The wind power generating set specifically provided by the present invention includes a low-voltage generator located in the hub and/or in the nacelle. When feathering is required, the low-voltage generator can use the mechanical energy of the wind rotor to generate electricity and provide electrical energy for the pitch control system. , the pitch control system receives the electric energy provided by the low-voltage generator, so that the pitch control motor operates to drive the blade to retract, so that the pitch angle of the blade is greater than a preset angle value. Compared with the prior art, since the low-voltage generator of the present invention utilizes the mechanical energy of the wind wheel to generate electricity and provides electric energy for the pitch system, even if the grid input side loses power, the charger is abnormal, the backup power supply is abnormal, the grid When fluctuations lead to abnormal situations such as device damage or burnout, the present invention can still provide electric energy for the pitch system. After the pitch system receives the electric energy, the pitch motor runs to drive the blades to retract, so that the pitch angle of the blades is greater than The preset angle value can further enable the speed of the wind generator to drop rapidly, effectively avoiding the risk of the wind generator overspeeding or even speeding. When the speed of the wind turbine drops to a certain level, since the low-voltage generator uses the mechanical energy of the wind wheel to generate electricity, the output voltage of the low-voltage generator is reduced, which is not enough to provide power for the pitch system, and the blades are still in a safe position. , completed the feathering of the wind turbine.

The wind power generating set specifically provided by the present invention will be introduced in detail below in conjunction with the accompanying drawings.

Preferably, the nacelle 32 in the embodiment of the present invention includes a high-speed shaft and a low-speed shaft, the low-voltage generator 301 is located in the nacelle 32, and the input end of the low-voltage generator 301 is connected with the high-speed shaft and/or the low-speed shaft, and the high-speed shaft The specific arrangement of the low-speed shaft and the low-speed shaft in the nacelle 32 is the same as the prior art, and will not be repeated here; like this, the low-voltage generator 301 of the embodiment of the present invention can be driven by a high-speed shaft or a low-speed shaft to generate electricity, that is, by using the rotation of the blade itself Therefore, there is no need to add additional energy storage or mechanical devices, so the system structure is simple, the cost is low, and it is easy to transform and realize.

Specifically, the low-speed shaft in the embodiment of the present invention refers to the shaft connected to the wind turbine, and the high-speed shaft refers to the shaft connected to the generator after the gear box in the nacelle 32 changes speed (from low speed to high speed).

Several embodiments of the technical solution of the present invention are introduced below.

Embodiment one:

Embodiment 1 of the present invention is introduced by taking a low-voltage generator 301 arranged in the nacelle 32, the input end of the low-voltage generator 301 is connected to a high-speed shaft and/or a low-speed shaft, and the low-voltage generator 301 is a DC generator as an example.

The wind power generating set in the specific embodiment of the present invention comprises main control controller 112, and the slip ring 113 that is positioned at the connection position of wheel hub 106 and nacelle 32; The specific setting method is the same as that of the prior art, and will not be repeated here.

As shown in Figure 4, the output end of the low-voltage generator 301 in the specific embodiment of the present invention is electrically connected with slip ring 113 through normally open contact 303; Main control controller 112 is electrically connected with normally open contact 303, is used for controlling Normally open contact 303; Specifically, the main control controller 112 can control the closing or opening of the normally open contact 303 according to actual needs, so that the specific embodiment of the present invention can conveniently realize the low-voltage generator 301 and the slip ring 113 on or off between.

During specific implementation, as shown in FIG. 4 , the normally open contact 303 in the specific embodiment of the present invention is controlled by the DC contactor of the main control controller 112 .

As shown in Figure 4, the pitch system 33 in the specific embodiment of the present invention includes: a pitch controller 109, a pitch motor 107, a DC power supply 204 for powering the pitch controller 109, a frequency conversion for powering the pitch motor 107 203; the specific settings and working principles of the pitch controller 109, the pitch motor 107, the DC power supply 204, and the frequency converter 203 in the specific embodiment of the present invention are similar to those of the prior art, and will not be repeated here.

As shown in FIG. 4 , the output end of the low-voltage generator 301 in the specific embodiment of the present invention is electrically connected to the frequency converter 203 through the normally open contact 303 and the slip ring 113 in order to provide electric energy for the frequency converter 203 and the DC power supply 204 .

During specific implementation, the workable power supply voltage of the frequency converter 203 of the specific embodiment of the present invention is relatively low, so the voltage of the low-voltage generator 301 in the specific embodiment of the present invention can be selected from 50V to 100V, and the low-voltage DC generator of 4kW can be selected for power; Of course, in practical applications, other values can be selected for the operating voltage and operating power of the low-voltage generator 301 in the specific embodiment of the present invention, and the specific embodiment of the present invention does not limit the operating voltage and operating power of the low-voltage generator 301 .

The working principle of the specific embodiment of the present invention one is:

(1) Under normal circumstances:

The main control controller 112 controls the normally open contact 303 to be disconnected. At this time, the low-voltage generator 301 does not provide electric energy for the frequency converter 203 and the DC power supply 204. The working process of the wind turbine is the same as that of the prior art, and will not be repeated here.

(2) When the power grid fails, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations lead to device damage or burnout, etc., resulting in the failure of the blade to retract the propeller:

The main control controller 112 controls the normally open contact 303 to close (turn on) through the communication data with the pitch controller 109 and the detection of the grid information by the main control controller 112; wherein, the working power of the main control controller 112 It is provided by UPS (Uninterruptible Power Supply, uninterruptible power supply) of the main control system.

Since the input end of the low-voltage generator 301 is connected to the high-speed shaft and/or the low-speed shaft, when the blades of the wind-driven generator are in a rotating state, the high-speed shaft and/or the low-speed shaft of the wind-driven generator will drive the low-voltage generator 301 to rotate to generate electricity. When the normally open contact 303 is closed, the output voltage of the low-voltage generator 301 is connected to the frequency converter 203 to provide working power for the frequency converter 203 and DC power supply 204 at the same time. At this time, the pitch controller 109 can operate normally. work, the pitch system 33 controls the operation of the pitch motor 107 under the control of the pitch controller 109 , and then drives the blades to retract.

When the rotation speed of the blades decreases to a certain value, on the one hand, the rotation speed of the low-voltage generator 301 decreases due to the reduction of the rotation speed of the blades, thereby reducing the output voltage of the low-voltage generator 301, which is not enough to provide working power for the frequency converter 203 and the DC power supply 204 , so that the pitch controller 109 and the pitch motor 107 stop running.

On the other hand, since the main control controller 112 itself can detect the rotational speed value of the wind turbine, and can detect the pitch angle of the blade through communication with the pitch system, so when the main control controller 112 detects the rotational speed of the wind turbine When the value is reduced to a certain value, and/or the pitch angle of the blade is greater than the safe position (for example, greater than 65 degrees), the main control controller 112 can control the normally open contact 303 to disconnect, so that the power supply of the frequency converter 203 and the DC power supply 204 The voltage is disconnected, thereby stopping the pitch motor 107 from running.

Embodiment two:

Embodiment 2 of the present invention is introduced by taking a low-voltage generator 301 arranged in the nacelle 32 , the input end of the low-voltage generator 301 is connected to a high-speed shaft and/or a low-speed shaft, and the low-voltage generator 301 is a DC generator as an example.

As shown in Figure 5, the pitch system 33 includes: a pitch controller 109, a pitch motor 107, a DC power supply 204, and a frequency converter 203; The point 303 and the slip ring 113 are electrically connected with the pitch motor 107 for providing electric energy for the pitch motor 107 .

Specifically, if the pitch motor 107 in the specific embodiment of the present invention is a DC series-excited motor, the output terminal of the low-voltage generator 301 is in turn normally open the contact 303, the slip ring 113 and the “+” of the pitch motor 107 respectively. , "-" terminal electrical connection.

Preferably, the wind power generating set provided in Embodiment 2 of the present invention further includes a brake release control system, which is used to release the brake of the pitch motor 107 under the control of the main control controller 112 .

The working principle of the specific embodiment of the present invention two is:

(1) Under normal circumstances:

The main control controller 112 controls the normally open contact 303 to be disconnected, and the low-voltage generator 301 does not provide electric energy for the frequency converter 203 and the DC power supply 204 at this time.

(2) When the power grid fails, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations lead to device damage or burnout, etc., resulting in the failure of the blade to retract the propeller:

The main control controller 112 controls the normally open contact 303 to close (turn on) through the communication data with the pitch controller 109 and the detection of the grid information by the main control controller 112; wherein, the working power of the main control controller 112 Provided by the UPS of the main control system.

Since the input end of the low-voltage generator 301 is connected to the high-speed shaft and/or the low-speed shaft, when the blades of the wind-driven generator are in a rotating state, the high-speed shaft and/or the low-speed shaft of the wind-driven generator will drive the low-voltage generator 301 to rotate to generate electricity. When the normally open contact 303 is closed, the voltage output by the low-voltage generator 301 is connected to the pitch motor 107 to provide working power for the pitch motor 107; at the same time, the main control controller 112 controls the brake release control system through the slip ring 113 , so that the pitch motor 107 releases the brake, and the pitch motor 107 drives the blade 114 to retract after the pitch motor 107 releases the brake, so that the pitch angle of the blade 114 is greater than a preset angle value.

When the speed of the blades decreases to a certain value, on the one hand, the speed of the low-voltage generator 301 decreases due to the reduction of the speed of the blades, and the output voltage of the low-voltage generator 301 decreases, which is not enough to provide the working power for the pitch motor 107. At this time Make the pitch motor 107 stop running.

On the other hand, since the main control controller 112 itself can detect the rotational speed value of the wind turbine, and can detect the pitch angle of the blade through communication with the pitch system, so when the main control controller 112 detects the rotational speed of the wind turbine When the value is reduced to a certain value, and/or the pitch angle of the blade is greater than the safe position (for example, greater than 65 degrees), the main control controller 112 can control the normally open contact 303 to disconnect, so that the power supply voltage of the pitch motor 107 is disconnected , so that the pitch motor 107 stops running and brakes.

The following describes in detail the structure of the brake release control system in Embodiment 2 of the present invention in conjunction with the accompanying drawings, and the specific control method for the main control controller to control the brake release control system through a slip ring to make the pitch motor brake release.

method one:

As shown in Figure 6, the brake release control system provided by the specific embodiment of the present invention includes: a brake release solenoid valve 408, a relay 502 and a brake release branch 61; in addition, the brake release control system in the specific embodiment of the present invention also includes a transformer The specific arrangement of the pitch driver 401 and the brake relay 402 is similar to that of the prior art, and will not be repeated here.

As shown in Figure 6, one end of the release solenoid valve 408 is electrically connected to the output end of the relay 502, and the other end is electrically connected to a constant voltage power supply (24V power supply as shown in the figure) through the release branch 61;

The release branch 61 is provided with a normally closed contact 503 and a first normally open contact 405;

Both the normally closed contact 503 and the first normally open contact 405 are electrically connected to the main control controller 112;

The main control controller 112 is used to control the signal of the input terminal 501 of the relay 502 , so that the relay 502 is energized, and controls the normally closed contact 503 to close, and controls the first normally open contact 405 to close.

Of course, in this embodiment, the pitch controller 109 may also control the closing of the first normally open contact 405. In the specific embodiment of the present invention, the main control controller 112 is selected to control the closing of the first normally open contact 405. In this way, no The pitch controller 109 works, and can also complete the control of the first normally open contact 405 .

As shown in Figure 6, the control logic of the brake release control system provided by the specific embodiment of the present invention is:

When the power grid is powered off, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations lead to device damage or burnout, etc., and the blades cannot be retracted due to abnormal conditions, the main control controller 112 controls the relay 502 to be energized, wherein the normally closed The contact 503 is the normally closed contact of the relay 502. The main control controller 112 controls the normally closed contact 503 to close, and controls the first normally open contact 405 to close. The control controller 112 controls the brake release of the pitch motor 107.

Method 2:

As shown in Figure 7, the brake release control system provided by the specific embodiment of the present invention includes: a brake release solenoid valve 408, a relay 502, a redundant relay 404, a first brake release branch 71 and a second brake release branch 72; , The brake release control system in the specific embodiment of the present invention also includes a pitch driver 401 and a brake relay 402. The specific setting methods of the pitch driver 401 and the brake relay 402 are similar to the prior art, and will not be repeated here.

As shown in Figure 7, the first release branch 71 is provided with a normally closed contact 503 and a first normally open contact 405;

The second release branch 72 is connected in parallel with the first release branch 71, and is provided with a second normally open contact 406;

Redundant relay 404 is arranged in parallel with relay 502, and one end of release solenoid valve 408 is electrically connected with the output end of relay 502 and the output end of redundant relay 404, and the other end is connected in parallel through the first release branch 71 and the second The brake release branch 72 is electrically connected with a constant voltage power supply (such as the 24V power supply among the figures);

The normally closed contact 503, the first normally open contact 405 and the second normally open contact 406 are all electrically connected to the main control controller 112;

The main control controller 112 is used to control the signal of the input terminal 501 of the relay 502 and the signal of the input terminal 403 of the redundant relay 404, so that the relay 502 and the redundant relay 404 are energized, and control the second normally open contact 406 Closed, control the first normally open contact 405 to open, control the normally closed contact 503 to open; at this time, control the first normally open contact 405 and the normally closed contact 503 to open to ensure that the first release branch 71 is disconnected to avoid complete short circuit with the second brake release branch 72.

Of course, in this embodiment, the first normally open contact 405 can also be controlled by the pitch controller 109 to be disconnected. In the specific embodiment of the present invention, the main control controller 112 is selected to control the first normally open contact 405 to be disconnected. In this way, The control of the first normally open contact 405 can also be completed without the pitch controller 109 working.

As shown in Figure 7, the control logic of the brake release control system provided by the specific embodiment of the present invention is:

When the power grid is powered off, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations cause damage or burning of components, etc., resulting in the failure of the blades to retract the propeller, the main control controller 112 controls the relay 502 and the redundant relay 404 to be energized. , wherein the normally closed contact 503 is the normally closed contact of the relay 502, the main control controller 112 controls the normally closed contact 503 to open, and the main control controller 112 controls the second normally open contact 406 to close, at this time the second The brake release branch 72 is turned on, so as to realize the brake release control of the pitch motor 107 by the main control controller 112 .

The effect of the normally closed contact 503 in the specific embodiment of the present invention is: when the redundant relay 404 is energized, the contact action of the brake relay 402 can be prevented; at the same time, the normally closed contact 503 can make the pitch control system operate normally , the control of releasing and holding the brake is not affected by the redundant relay 404; the advantage of controlling the redundant relay 404 by the main control controller 112 in the specific embodiment of the present invention is: when the pitch system PLC (Programmable Logic Controller, programmable logic controller) failure, or backup power supply failure, or after the pitch driver 401 fails, normal propeller retraction can still be achieved.

In addition, in the specific embodiment of the present invention, the main control controller 112 controls the opening of the normally closed contact 503, thereby closing the first release branch 71, preventing the first normally open contact 405 from being Cannot be disconnected normally.

In addition, if the pitch controller 109 is used to control the opening of the first normally open contact 405 in the specific embodiment of the present invention, it can prevent the first brake release branch 71 and the second brake release branch from 72 is fully shorted.

Embodiment three:

Embodiment 3 of the present invention is introduced by taking a low-voltage generator 301 arranged in the nacelle 32 , the input end of the low-voltage generator 301 is connected to a high-speed shaft and/or a low-speed shaft, and the low-voltage generator 301 is an alternator as an example.

The pitch system 33 of the wind power generating set in the specific embodiment of the present invention includes a charger 209 , a pitch controller 109 and a pitch motor 107 .

As shown in Figure 8, the output end of the low-voltage generator 301 in the specific embodiment of the present invention is electrically connected with the three-phase line of the grid input side 207 through the normally open contact 303 and the slip ring 113 in order to provide electric energy for the charger 209 .

Optionally, the wind power generating set provided in Embodiment 2 of the present invention further includes a brake release control system, configured to release the brakes of the pitch motor 107 under the control of the main control controller 112 .

The operating principle of the specific embodiment of the present invention three is:

(1) Under normal circumstances:

The main control controller 112 controls the normally open contact 303 to be disconnected. At this time, the low-voltage generator 301 does not provide electric energy for the charger 209 .

(2) When the power grid fails, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations lead to device damage or burnout, etc., resulting in the failure of the blade to retract the propeller:

The main control controller 112 controls the normally open contact 303 to close (turn on) through the communication data with the pitch controller 109 and the detection of the grid information by the main control controller 112; wherein, the working power of the main control controller 112 Provided by the UPS of the main control system.

Since the input end of the low-voltage generator 301 is connected to the high-speed shaft and/or the low-speed shaft, when the blades of the wind-driven generator are in a rotating state, the high-speed shaft and/or the low-speed shaft of the wind-driven generator will drive the low-voltage generator 301 to rotate to generate electricity. When the normally open contact 303 is closed, the voltage output by the low-voltage generator 301 is connected to the charger 209 to provide the working power for the inverter 203 and the DC power supply 204 at the same time. At this time, the pitch controller 109 can operate normally. work, the pitch system 33 controls the operation of the pitch motor 107 under the control of the pitch controller 109 , and then drives the blades to retract.

In addition, the third embodiment of the present invention can also be that the main control controller 112 controls the brake release control system through the slip ring 113, so that the pitch motor 107 releases the brake. The specific method of the main control controller 112 controlling the brake release control system is the same as the above implementation Example 2 is the same, and will not be repeated here.

In the actual production process, the specific embodiment three of the present invention is preferably controlled by the pitch controller 109, and the specific control process can be referred to in the first embodiment. Compared with the main control controller 112, the pitch controller 109 does not need to be set. The brake release control system in the specific embodiment of the invention.

When the rotation speed of the blades decreases to a certain value, on the one hand, the rotation speed of the low-voltage generator 301 decreases due to the reduction of the rotation speed of the blades, thereby reducing the output voltage of the low-voltage generator 301, which is not enough to provide working power for the charger 209. At this time, the The pitch controller 109 and the pitch motor 107 stop running.

On the other hand, since the main control controller 112 itself can detect the rotational speed value of the wind turbine, and can detect the pitch angle of the blade through communication with the pitch system, so when the main control controller 112 detects the rotational speed of the wind turbine When the value is reduced to a certain value, and/or the pitch angle of the blade is greater than the safe position (for example, greater than 65 degrees), the main control controller 112 can control the normally open contact 303 to disconnect, so that the power supply voltage of the charger 209 is disconnected, Thereby the pitch motor 107 is stopped and braked.

Embodiment four:

Embodiment 4 of the present invention is introduced by taking a low-voltage generator 301 arranged in the nacelle 32, the input end of the low-voltage generator 301 is connected to a high-speed shaft and/or a low-speed shaft, and the low-voltage generator 301 is an alternator as an example.

The pitch system 33 of the wind power generating set in the specific embodiment of the present invention includes a charger 209 , a pitch controller 109 and a pitch motor 107 .

In the specific embodiment of the present invention, the output end of the low-voltage generator 301 is electrically connected to the three-phase line of the pitch motor 107 through the normally open contact 303 and the slip ring 113 in order to provide electric energy for the pitch motor 107. The specific connection method can be See Figure 5.

Preferably, the wind power generating set provided in Embodiment 4 of the present invention further includes a brake release control system, which is used to release the brake of the pitch motor 107 under the control of the main control controller 112 .

The operating principle of the specific embodiment four of the present invention is:

(1) Under normal circumstances:

The main control controller 112 controls the normally open contact 303 to be disconnected. At this time, the low-voltage generator 301 does not provide electric energy for the frequency converter 203 and the DC power supply 204. The working process of the wind turbine is the same as that of the prior art, and will not be repeated here.

(2) When the power grid fails, the charger is abnormal, the backup power of the pitch control system is abnormal, and the power grid fluctuations lead to device damage or burnout, etc., resulting in the failure of the blade to retract the propeller:

The main control controller 112 controls the normally open contact 303 to close (turn on) through the communication data with the pitch controller 109 and the detection of the grid information by the main control controller 112; wherein, the working power of the main control controller 112 Provided by the UPS of the main control system.

Since the input end of the low-voltage generator 301 is connected to the high-speed shaft and/or the low-speed shaft, when the blades of the wind-driven generator are in a rotating state, the high-speed shaft and/or the low-speed shaft of the wind-driven generator will drive the low-voltage generator 301 to rotate to generate electricity. When the normally open contact 303 is closed, the voltage output by the low-voltage generator 301 is connected to the pitch motor 107 to provide working power for the pitch motor 107; at the same time, the main control controller 112 controls the brake release control system through the slip ring 113 , so that the pitch motor 107 releases the brake, and the specific manner in which the main control controller 112 controls the brake release control system is the same as that of the second embodiment above, and will not be repeated here.

When the speed of the blades decreases to a certain value, on the one hand, the speed of the low-voltage generator 301 decreases due to the reduction of the speed of the blades, and the output voltage of the low-voltage generator 301 decreases, which is not enough to provide the working power for the pitch motor 107. At this time Make the pitch motor 107 stop running.

On the other hand, since the main control controller 112 itself can detect the rotational speed value of the wind turbine, and can detect the pitch angle of the blade through communication with the pitch system, so when the main control controller 112 detects the rotational speed of the wind turbine When the value is reduced to a certain value, and/or the pitch angle of the blade is greater than the safe position (for example, greater than 65 degrees), the main control controller 112 can control the normally open contact 303 to disconnect, so that the power supply voltage of the pitch motor 107 is disconnected , so that the pitch motor 107 stops running and brakes.

Embodiment five:

The low-voltage generator 301 in the specific embodiment of the present invention is arranged in the hub 106, and the low-voltage generator 301 generates electricity through the rotation of the hub 106, thereby providing electric energy for the pitch system 33; the low-voltage generator 301 in the fifth specific embodiment of the present invention It can be a DC generator or an AC generator.

Preferably, the output end of the low-voltage generator 301 in Embodiment 5 of the present invention is electrically connected to the slip ring 113 through the normally open contact 303; the main control controller 112 is electrically connected to the normally open contact 303 for controlling the normally open contact 303 The contact 303 is opened.

The voltage output by the low-voltage generator 301 in the fifth embodiment of the present invention can provide working power for the frequency converter 203 and the DC power supply 204, and the specific method can refer to the above-mentioned embodiment one; of course, the low-voltage power generation in the fifth embodiment of the present invention The voltage output by generator 301 can also provide working power for the pitch motor 107, and the specific method can refer to the above-mentioned embodiment two and embodiment four; of course, the voltage output by the low-voltage generator 301 in the fifth embodiment of the present invention can also be used for charging The machine 209 provides working power, and the specific method can refer to the third embodiment above.

Specifically, the low-voltage generator 301 in the fifth embodiment of the present invention can be arranged at the center of the hub 106, and since the center of the hub 106 is generally provided with a conductive slip ring, it is not too difficult to set the low-voltage generator 301 at the center of the hub 106. For convenience, this arrangement is only the most selected solution of the present invention. In the actual production process, the specific embodiment of the present invention can arrange the low-voltage generator 301 in other positions in the hub 106 .

Based on the same inventive concept, a specific embodiment of the present invention also provides a feathering method using the above-mentioned wind power generating set, as shown in FIG. 9 , the method includes:

S901. Control the low-voltage generator 301 to be electrically connected to the pitch system 33, so that the low-voltage generator 301 provides electric energy for the pitch system 33;

S902. Control the operation of the pitch motor 107 included in the pitch system 33 to drive the blade 114 to retract, so that the pitch angle of the blade 114 is greater than a preset angle value (eg, greater than 65 degrees).

Preferably, in the above-mentioned step S901 of the specific embodiment of the present invention, controlling the electrical connection between the low-voltage generator 301 and the pitch system 33 includes: the main control controller 112 controls the normally open contact 303 to close, so that the output terminal of the low-voltage generator 301 It is electrically connected to the slip ring 113 through the normally open contact 303 , as shown in FIG. 4 , FIG. 5 and FIG. 8 for details.

Specifically, in the specific embodiment of the present invention, in the above step S901, controlling the low-voltage generator 301 to be electrically connected to the pitch system 33 specifically includes: when the low-voltage generator 301 is a DC generator, the main control controller 112 controls the normally open contact 303 is closed, so that the output end of the low-voltage generator 301 is electrically connected to the frequency converter 203 through the normally open contact 303 and the slip ring 113 in turn, as shown in FIG. 4 for details; or, the main control controller 112 controls the normally open contact 303 Closed, so that the output end of the low-voltage generator 301 is electrically connected to the pitch motor 107 through the normally open contact 303 and the slip ring 113 in turn, as shown in FIG. 5 for details.

Specifically, in the above-mentioned step S901 of the specific embodiment of the present invention, controlling the electrical connection between the low-voltage generator 301 and the pitch system 33 specifically includes: when the low-voltage generator 301 is an alternator, the main control controller 112 controls the normally open contact 303 is closed, so that the output end of the low-voltage generator 301 is electrically connected to the pitch motor 107 through the normally open contact 303 and the slip ring 113 in turn, as shown in FIG. 5 for details; or, the main control controller 112 controls the normally open contact 303 is closed, so that the output end of the low-voltage generator 301 is electrically connected to the three-phase line of the grid input side 207 through the normally open contact 303 and the slip ring 113 in turn, as shown in FIG. 8 .

Preferably, in the above-mentioned step S902 of the specific embodiment of the present invention, controlling the operation of the pitch motor 107 included in the pitch system 33 includes:

When the output end of the low-voltage generator 301 is electrically connected to the frequency converter 203 through the normally open contact 303 and the slip ring 113 in turn; When the three-phase line of 207 is electrically connected, the pitch controller 109 included in the pitch system 33 controls the operation of the pitch motor 107, and the specific control process can refer to the first and third embodiments above; and

When the output terminal of the low-voltage generator 301 is electrically connected to the pitch motor 107 through the normally open contact 303) and the slip ring 113 in turn, the main control controller 112 controls the pitch motor 107 to loosen the brake through the slip ring 113. The specific control process can be found in Above-mentioned embodiment two and embodiment four.

Based on the same inventive concept, specific embodiments of the present invention further provide a computer storage medium, where the computer storage medium stores a program corresponding to the feathering method of the above-mentioned wind power generating set.

Those skilled in the art will appreciate that the present invention includes devices related to performing one or more of the operations described in this application. These devices may be specially designed and fabricated for the required purposes, or they may include known devices found in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program can be stored in a device (e.g., computer) readable medium, including but not limited to any type of medium suitable for storing electronic instructions and respectively coupled to a bus. Types of disks (including floppy disks, hard disks, CDs, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (eg, a computer).

To sum up, a wind power generating set provided by a specific embodiment of the present invention has the following beneficial effects:

First, in emergency situations such as power failure of the power grid, abnormality of the charger, abnormality of the backup power supply of the pitch system, and damage or burnout of devices caused by fluctuations in the power grid, the specific implementation of the invention is driven by the rotational force generated by the wind generator during the rotation of the blades. The low-voltage generator set in the example generates electricity, and the generated electric energy provides working power for the operation of the pitch control system, thereby driving the blades to feather to a safe position. Specifically, the voltage output by the low-voltage generator is electrically connected to relevant parts of the pitch system through normally open contacts and slip rings.

Second, after an emergency failure occurs in the pitch control system, the low-voltage generator provided by the specific embodiment of the present invention provides working power for the pitch control motor, and the main control controller controls the pitch control motor to release the brake, and drives the blades to feather to a safe position .

Third, since the low-voltage generator set in the specific embodiment of the present invention utilizes the rotational force of the blades to generate electricity, no additional energy storage or mechanical devices are required, the system structure is simple, the cost is low, and it is easy to modify and realize.

Fourth, when the blade speed drops to a certain speed, the low-voltage generator set in the specific embodiment of the present invention outputs less electric energy, thereby automatically stopping the supply of electric energy to the pitch system; at the same time, when the blade is feathered to a safe position, it also The normally open contact can be disconnected by the main control controller to cut off the power for the pitch system. Specifically, the DC voltage output by the low-voltage generator set in the specific embodiment of the present invention can be directly input into the pitch motor, or can be input into the frequency converter and the DC power supply included in the pitch system; The AC voltage output by the low-voltage generator can be directly input to the pitch motor, or can be input to the charger included in the pitch system.

The above descriptions are only part of the embodiments of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principles of the present invention. It should be regarded as the protection scope of the present invention.

Claims (13)

1. a kind of wind power generating set, including：Wind wheel (31) and cabin (32), the wind wheel (31) include wheel hub (106) and leaf Piece (114), is provided with pitch-controlled system (33) in the wheel hub (106), and the pitch-controlled system (33) includes pitch motor (107), It is characterized in that, further include：In the wheel hub (106), and/or the low voltage generator in the cabin (32) (301)；

The low voltage generator (301), for when needing feathering, the mechanical energy rotated using the wind wheel (31) to be generated electricity, and is The pitch-controlled system (33) provides electric energy；

The pitch-controlled system (33), is electrically connected, for receiving the electric energy so that the change with the low voltage generator (301) Paddle motor (107) is run, to drive the blade (114) to put away the oars so that the propeller pitch angle of the blade (114) is more than predetermined angle Value.

2. wind power generating set according to claim 1, it is characterised in that the cabin (32) includes high speed shaft and low speed Axis, the low voltage generator (301) are located in the cabin (32), and input terminal and the high speed shaft and/or the slow-speed shaft Connection.

3. wind power generating set according to claim 2, it is characterised in that including master controller (112), and be located at The wheel hub (106) and the slip ring (113) at the link position of the cabin (32)；

The output terminal of the low voltage generator (301) is electrically connected by normally opened contact (303) with the slip ring (113)；

The master controller (112) is electrically connected with the normally opened contact (303), for controlling the normally opened contact (303).

4. wind power generating set according to claim 3, it is characterised in that the pitch-controlled system (33) includes：Variable pitch control Device (109) processed, be the DC power supply (204) of the pitch control device (109) power supply, be what the pitch motor (107) was powered Frequency converter (203)；

When the low voltage generator (301) is dc generator, the output terminal of the low voltage generator (301) passes sequentially through institute State normally opened contact (303), the slip ring (113) is electrically connected with the frequency converter (203), for for the frequency converter (203) and The DC power supply (204) provides electric energy；

Alternatively, the output terminal of the low voltage generator (301) pass sequentially through the normally opened contact (303), the slip ring (113) with The pitch motor (107) is electrically connected, for providing electric energy for the pitch motor (107).

5. wind power generating set according to claim 3, it is characterised in that the pitch-controlled system (33) includes charger (209)；

When the low voltage generator (301) is alternating current generator, the output terminal of the low voltage generator (301) passes sequentially through institute State normally opened contact (303), the slip ring (113) is electrically connected with the pitch motor (107), for for the pitch motor (107) electric energy is provided；Or,

The output terminal of the low voltage generator (301) passes sequentially through the normally opened contact (303), the slip ring (113) and power grid The three-phase line of input side (207) is electrically connected, for providing electric energy for the charger (209).

6. wind power generating set according to claim 4 or 5, it is characterised in that further include the control system that declutches, for Under the control of the master controller (112) so that the pitch motor (107) is declutched.

7. wind power generating set according to claim 6, it is characterised in that the control system that declutches includes：Declutch electricity Magnet valve (408), relay (502) and the branch that declutches (61)；

One end of the solenoid valve that declutches (408) is electrically connected with the output terminal of the relay (502), and the other end passes through the pine Lock branch (61) is electrically connected with constant voltage source；

The branch that declutches (61) is provided with normally-closed contact (503) and the first normally opened contact (405)；

The normally-closed contact (503), first normally opened contact (405) are electrically connected with the master controller (112)；

The master controller (112) is used for the signal for controlling the relay (502) input terminal so that the relay (502) must be electric, and control the normally-closed contact (503) to close, control the first normally opened contact (405) closure.

8. wind power generating set according to claim 6, it is characterised in that the control system that declutches includes：Declutch electricity Magnet valve (408), relay (502), redundancy relay (404), first branch (71) and second that declutches declutch branch (72)；

Described first branch (71) that declutches is provided with normally-closed contact (503) and the first normally opened contact (405)；

Described second branch (72) that declutches is connected in parallel with described first branch (71) that declutches, and is provided with the second normally opened contact (406)；

The redundancy relay (404) is arranged in parallel with the relay (502), one end of the solenoid valve that declutches (408) with The output terminal of the relay (502) and the output terminal of the redundancy relay (404) are electrically connected, and the other end is by being connected in parallel Described first declutch branch (71) and described second branch (72) that declutches is electrically connected with constant voltage source；

The normally-closed contact (503), first normally opened contact (405) and second normally opened contact (406) with the master Controller (112) is controlled to be electrically connected；

The master controller (112) is used for the letter for controlling the relay (502) and the redundancy relay (404) input terminal Number so that the relay (502) and the redundancy relay (404) must be electric, and control second normally opened contact (406) to close Close, control first normally opened contact (405) to disconnect, control the normally-closed contact (503) to disconnect.

A kind of 9. feathering method using claim 1-8 any one of them wind power generating sets, it is characterised in that including：

The low voltage generator (301) is controlled to be electrically connected with the pitch-controlled system (33) so that the low voltage generator (301) is The pitch-controlled system (33) provides electric energy；

The operation for the pitch motor (107) that the pitch-controlled system (33) includes is controlled, to drive the blade (114) to put away the oars, is made The propeller pitch angle for obtaining the blade (114) is more than preset angle angle value.

10. feathering method according to claim 9, it is characterised in that described to control the low voltage generator (301) and institute Pitch-controlled system (33) electrical connection is stated, including：

Master controller (112) control normally opened contact (303) closure so that the output terminal of the low voltage generator (301) passes through The normally opened contact (303) is electrically connected with slip ring (113).

11. feathering method according to claim 10, it is characterised in that the control low voltage generator (301) with The pitch-controlled system (33) is electrically connected, and specifically includes：

When the low voltage generator (301) is dc generator,

Master controller (112) controls normally opened contact (303) closure so that the output terminal of the low voltage generator (301) Pass sequentially through the normally opened contact (303), the slip ring (113) is electrically connected with frequency converter (203)；

Or, master controller (112) controls normally opened contact (303) closure so that the output of the low voltage generator (301) End passes sequentially through the normally opened contact (303), the slip ring (113) is electrically connected with the pitch motor (107)；

When the low voltage generator (301) is alternating current generator,

Master controller (112) controls normally opened contact (303) closure so that the output terminal of the low voltage generator (301) Pass sequentially through the normally opened contact (303), the slip ring (113) is electrically connected with the pitch motor (107)；

Or, master controller (112) controls normally opened contact (303) closure so that the output of the low voltage generator (301) End passes sequentially through the normally opened contact (303), the slip ring (113) is electrically connected with the three-phase line of power grid input side (207).

12. feathering method according to claim 11, it is characterised in that the control pitch-controlled system (33) includes Pitch motor (107) operation, including：

When the output terminal of the low voltage generator (301) passes sequentially through the normally opened contact (303), the slip ring (113) and institute State frequency converter (203) electrical connection；Or, the output terminal of the low voltage generator (301) pass sequentially through the normally opened contact (303), When the slip ring (113) is electrically connected with the three-phase line of power grid input side (207), variable pitch control that the pitch-controlled system (33) includes Device (109) processed controls the operation of the pitch motor (107)；And

When the output terminal of the low voltage generator (301) passes sequentially through the normally opened contact (303), the slip ring (113) and institute When stating pitch motor (107) electrical connection, the master controller (112) passes through the slip ring (113) and controls the pitch motor (107) declutch.

13. a kind of computer-readable storage medium, it is characterised in that storage is corresponding just like any one of claim 9-12 feathering methods Program.