CN112253386B - Wind power generation equipment and blade self-pitching control method, system and device thereof - Google Patents
Wind power generation equipment and blade self-pitching control method, system and device thereof Download PDFInfo
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- CN112253386B CN112253386B CN202011103421.9A CN202011103421A CN112253386B CN 112253386 B CN112253386 B CN 112253386B CN 202011103421 A CN202011103421 A CN 202011103421A CN 112253386 B CN112253386 B CN 112253386B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/304—Spool rotational speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses wind power generation equipment, a blade self-pitching control method, a blade self-pitching control system and a blade self-pitching control device, wherein the blade self-pitching control method comprises the following steps: acquiring angle change information of a blade of the fan when the blade rotates under the action of wind power; and controlling the blade-changing band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blade to rotate to a preset safety position. According to the blade self-variable pitch control method, the blades rotate under the action of pure wind force to reduce the rotation speed of the wind wheel, and the input/exit of the variable pitch band-type brake on the fan is controlled according to the information of the change trend of the angle of the blades, so that the blade back-pitch operation can be effectively controlled through wind force when the blades can not back-pitch, and the problem that the rotation speed of a wind driven generator can not be reduced when the blades can not normally back-pitch in the prior art, and overspeed and even galloping of the wind driven generator can be caused can be effectively solved.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to wind power generation equipment, a blade self-pitching control method, a blade self-pitching control system and a blade self-pitching control device.
Background
In the prior art, the mode for solving the overspeed galloping of the large wind turbine generator mainly comprises two modes: 1. "safety chain" mode: the safety chain is the most important safety system for protecting the wind turbine generator, is independent of the last stage of protection of a control system of the wind turbine generator, adopts reverse logic design, connects all fault points which cause the accident of the wind turbine generator in series to form a loop, and triggers emergency shutdown once a certain point acts, so that the safety of the wind turbine generator is ensured; the safety chain is internally provided with overspeed nodes such as generator overspeed, gearbox overspeed and wind wheel overspeed, the nodes can ensure that the wind turbine generator does not generate galloping accidents, when one overspeed signal is triggered, the yaw, frequency conversion, main control and other systems of the wind turbine generator can be in a locking state, the backup power supply forcibly changes the pitch, so that the blades return to a safe position, and when the rotating speed is reduced to a safe rotating speed range, the hydraulic braking system is put into, and the wind turbine is stopped emergently. However, when the control system fails, the safety chain fails, or the blade is stuck and the backup power supply fails, the blade cannot be turned back, so that the galloping is caused. 2. Yaw side-to-wind mode: when the safety chain is in a closed state, the hydraulic pressure of the fan and the yaw system function are not locked, automatic +/-90 DEG wind and side wind can be set in a control program, when the safety chain is in an open state, the hydraulic pressure of the fan and the yaw system function are locked, and the hydraulic pressure and the yaw system loop is independently controlled, so that the yaw can be automatically and manually carried out under abnormal conditions, the automatic/manual +/-90 DEG wind can be realized, the rotation speed of a wind wheel is reduced, and the machine set is safely stopped. However, the yaw side wind-proof is realized by adopting a countermeasure for solving the problem of galloping under the failure of a safety chain mode, a second set of control system is needed to be provided for a yaw control related loop or a second set of control loop is designed, and because the impeller absorbs wind energy from huge wind direction under the extreme state that the wind turbine generator is overspeed, a large moment is generated by a hydraulic caliper and a brake disc of a fixed engine room in the direction directly above or below the wind direction, and therefore, the possibility that a yaw motor is overloaded and cannot act exists in yaw.
Therefore, how to avoid the risk of galloping caused by the failure of the blades of the wind turbine to perform normal pitching operation is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide wind power generation equipment, a blade self-pitching control method, a blade self-pitching control system and a blade self-pitching control device, which can enable blades to rotate under the action of wind power so as to reduce the rotating speed of a wind wheel, and meanwhile, the safety shutdown of a unit is realized through intermittent braking.
In order to achieve the above object, the present invention provides a blade self-pitch control method, including:
acquiring angle change information of a blade of the fan when the blade rotates under the action of wind power;
and controlling the blade-changing band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blade to rotate to a preset safety position.
Optionally, the step of obtaining information about an angle change of the blade of the fan when the blade rotates under the action of wind force includes:
Acquiring a pitch angle parameter set when the blade rotates under the action of wind power;
And determining monotonicity of the blade angle change according to the pitch angle parameter set.
Optionally, the step of controlling the opening and closing of the variable pitch band-type brake on the fan according to the angle change information so as to enable the blade to rotate to a preset safety position includes:
If the angle change of the blade is non-monotonic, controlling the variable-pitch band-type brake to be closed, and controlling the variable-pitch band-type brake to be opened after a preset time so that the blade can be rotated to the preset safety position under the action of wind power.
Optionally, before the step of obtaining the information of the angle change of the blade of the fan when the blade rotates under the action of wind force, the method includes:
When overspeed of a wind wheel of the fan is detected and the blade does not execute emergency back-paddle action, a variable-pitch motor on the fan is controlled to be closed and a variable-pitch band-type brake is controlled to be opened so that the blade can rotate under the action of wind power.
Optionally, the preset safety position is specifically a position where the pitch angle of the blade is 90 °.
The invention also provides a blade self-variable pitch control system, which comprises:
the acquisition module is used for acquiring angle change information of the fan when the blades of the fan rotate under the action of wind power;
And the control module is used for controlling the paddle-changing band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blades to rotate to a preset safety position.
Optionally, the acquiring module includes:
the pitch angle acquisition unit is used for acquiring a pitch angle parameter set when the blade rotates under the action of wind power;
and the determining unit is used for determining the monotonicity of the blade angle change according to the pitch angle parameter set.
Optionally, the control module is specifically configured to:
If the angle change of the blade is non-monotonic, controlling the variable-pitch band-type brake to be closed, and controlling the variable-pitch band-type brake to be opened after a preset time so that the blade can be rotated to the preset safety position under the action of wind power.
The invention also provides a blade self-variable pitch control device, which comprises:
a memory for storing a computer program;
And the processor is used for realizing the steps of the blade self-pitching control method when executing the computer program.
The invention also provides wind power generation equipment, which comprises the blade self-variable pitch control device.
Compared with the background art, the blade self-variable pitch control method provided by the embodiment of the invention comprises the following steps: the method comprises the steps of obtaining angle change information when blades of a fan rotate under the action of wind force, and controlling a variable-pitch band-type brake on the fan to be opened and closed according to the angle change information so that the blades rotate to a preset safety position. It can be seen that through the free rotation of blade under pure wind-force effect, its angle change can reduce the lift of blade to reduce the rotational speed of wind wheel, simultaneously, according to blade angle change information, control the switching of changing oar band-type brake, can make the blade rotate to preset safe position through intermittent type nature mechanical braking like this, and then realize the safe shutdown of unit. Obviously, the blade self-pitching control method reduces the rotating speed of the wind wheel by rotating the blade under the action of pure wind force and controls the input/exit of the pitching band-type brake on the fan according to the information of the change trend of the angle of the blade, so that the blade pitching operation can be effectively controlled by wind force when the blade cannot be pitched, the problem that the rotating speed of the wind driven generator cannot be reduced when the blade cannot be pitched normally in the prior art, which causes overspeed of the wind driven generator and even galloping of the wind driven generator can be effectively solved, and the running safety of the wind driven generator can be guaranteed.
The invention also provides a blade self-pitching control system, a blade self-pitching control device and wind power generation equipment, which have the beneficial effects that the blade self-pitching control system and the blade self-pitching control device are not repeated here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a blade self-pitching control method provided by an embodiment of the present invention;
FIG. 2 is a diagram illustrating a motion profile of a fan blade according to an embodiment of the present invention;
FIG. 3 is a block diagram of a blade self-pitching control system provided by an embodiment of the present invention;
FIG. 4 is an electrical schematic provided by an embodiment of the present invention;
Fig. 5 is a schematic diagram of an assembly structure of a blade in the blade self-pitching control system according to the embodiment of the present invention.
Wherein:
A 1-acquisition module, a 2-control module,
101-Blades, 102-pitch bearings, 103-hubs, 104-pitch motors, 105-self-pitch controllers, 106-collision block devices, 107-limit switch devices,
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 to 5, fig. 1 is a flowchart of a blade self-pitching control method according to an embodiment of the present invention; FIG. 2 is a diagram illustrating a motion profile of a fan blade according to an embodiment of the present invention; FIG. 3 is a block diagram of a blade self-pitching control system provided by an embodiment of the present invention; FIG. 4 is an electrical schematic provided by an embodiment of the present invention; fig. 5 is a schematic diagram of an assembly structure of a blade in the blade self-pitching control system according to the embodiment of the present invention.
The blade self-variable pitch control method provided by the embodiment of the invention, as shown in the attached figure 1 of the specification, comprises the following steps:
s1, acquiring angle change information of a blade 101 of a fan when the blade rotates under the action of wind power;
s2, controlling the blade-changing band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blade 101 to rotate to a preset safety position.
For step S1, by free rotation of the blades 101 (i.e. the paddles) under the force of the wind, the change in the angle of the blades 101 can reduce the lift of the blades 101, thereby reducing the rotational speed of the rotor. In general, the rotation of the blade 101 under the wind force means that: the blade 101 is not subjected to any control force and rotates only under the action of natural wind.
The angle of the blade 101 refers to the pitch angle of the blade 101, also referred to as pitch angle (PITCH ANGLE); the pitch angle refers to the included angle between the fan blade 101 and the wind wheel plane; the wind driven generator adopts variable pitch control, and the purpose of adjusting the pitch angle of the wind driven generator is mainly to adjust the power by adjusting the windward angle of the blade 101:
1. in a starting state, under the action of wind power, a relatively large starting torque is obtained to drive the impeller of the wind driven generator to rotate;
2. Adjusting power output, obtaining an optimal tip speed ratio below a rated wind speed, maximizing wind energy utilization rate, stabilizing power above the rated wind speed, protecting machinery and circuit systems, and reducing load;
3. In a back-paddle state, pneumatic braking is realized during back-paddle, so that the rotating speed of the impeller is reduced rapidly, and the galloping accident caused by overspeed of the unit is avoided.
Aiming at the step S2, according to the condition of the change of the pitch angle of the blade 101, the opening and closing of the variable-pitch band-type brake are controlled, so that the blade 101 can be rotated to a preset safety position through intermittent mechanical braking, and the safety shutdown of a unit is realized.
That is, the blade self-pitching control method reduces the rotational speed of the wind wheel by rotating the blade 101 under the action of pure wind force, and controls the input/exit of the pitching band-type brake on the fan according to the information of the angle change trend of the blade 101, so that the control of the pitching operation of the blade 101 by wind force when the blade 101 cannot pitch back can be effectively realized, and the problems that the rotational speed of the wind driven generator cannot be reduced when the blade 101 cannot perform normal pitch back in the prior art, and overspeed and even galloping of the wind driven generator are caused can be effectively solved.
The blade self-variable pitch control method can be used for ensuring the running safety of the wind driven generator under the condition that a wind driven generator control system fails, a safety chain fails or a variable pitch backup power supply fails.
Because the lift type horizontal axis wind turbine mainly uses aerodynamic lift of the wing section of the blade 101 in the direction vertical to the airflow direction, the wind wheel rotates, the wind wheel blade 101 is divided into a plurality of micro segments along the spanwise direction, and the micro segments are called as phyllotoxins; assuming that the flows on each leaf element do not interfere with each other, the leaf elements are considered to be two-dimensional airfoils, and the forces and moments of each leaf element are summed (or integrated) to find the forces and moments on the individual blades 101. The force applied to the entire rotor is determined by multiplying the force on a single blade 101 by the number of blades 101. Phyllin kinetic analysis is described in reference to figure 2 of the accompanying drawings.
The velocity of each blade element is divided into a component velocity V x0 perpendicular to the rotor plane of rotation and a component velocity V y0 parallel to the rotor plane of rotation, the velocity triangle and aerodynamic components are shown in fig. 2, where the angle phi is the inflow angle and beta is the geometric twist angle of the blade 101 at the blade element.
According to momentum theory, when considering the wake rotation behind the rotor, there are:
The gas flow synthesis velocity V 0 at the phyllin is:
the inflow angle phi and the attack angle alpha at the phyllin are respectively
α＝φ-β (4)
After the attack angle alpha is obtained, the corresponding lift coefficient C l and drag coefficient C d can be obtained according to the aerofoil aerodynamic characteristic curve.
Aerodynamic forces acting on drphyllin of length caused by the velocity V 0 of the synthetic gas flow can be resolved into normal force dFn and tangential force dFt, dFn and dFt respectively
Wherein ρ is the air density; c-phyllin profile chord length; cn, ct-represent the normal force coefficient and tangential force coefficient, respectively, i.e.:
At this time, the axial force (thrust) and torque acting on the rotor plane dr ring can be expressed as
Wherein B is the number of the wind turbine blades 101.
Thus, the torque and axial force acting on the rotor can be determined using equations (7) and (8).
It can be seen from the above that: the axial force acting on the wind wheel can realize the rotation of the front edge in the stress direction under the condition that the blade 101 is not driven by motor torque force and electromagnetic braking force; meanwhile, since sin phi-cos phi is a monotonically increasing function within the range of [0, 90 degrees ], the rotation speed of the wind wheel can be rapidly reduced along with the reduction of the inflow angle phi when the torque acting on the wind wheel is reduced.
Thus, before the step of acquiring information on the angular change of the blade 101 of the wind turbine when it is rotated by the wind, it includes:
When overspeed of the wind wheel of the fan is detected and the blade 101 does not execute emergency back-paddle action, the variable-pitch motor 104 on the fan is controlled to be closed and the variable-pitch band-type brake is controlled to be opened so that the blade 101 can rotate under the action of wind force. Specifically:
The first step, a wind wheel rotating speed signal is obtained, whether the wind wheel exceeds speed (16 rpm) is detected, and when the wind wheel speed exceeds 16rpm, the second step is executed;
And secondly, acquiring a fan main control safety chain tightening and stopping signal, detecting whether the blade 101 executes an emergency back-paddle action, and acquiring a control signal when the blade 101 does not execute the emergency back-paddle action so as to control the main circuit of the power supply of the variable-pitch motor 104 to be disconnected and the variable-pitch band-type brake to be released, so that the blade 101 starts to freely pitch under the action of wind power.
It should be noted that, the wind wheel rotation speed signal can be directly transmitted into the analog interface of the blade self-variable pitch control system by the wind wheel rotation speed encoder; the 'safe chain tightly stopping signal' output by the main control is connected into a digital quantity interface of the blade self-variable pitch control system through a wiring.
In general, the case where the blade 101 cannot be pitched is generally divided into two types:
One is caused by the problem of an electrical system, when a wind wheel of the wind turbine is overspeed, a safety chain of the wind turbine is disconnected or not disconnected, and the blade 101 does not execute emergency back-pitching, at the moment, the emergency back-pitching judgment is obtained through the angle change of an encoder at the tail part of the variable-pitch motor 104, the angle value is connected into an analog quantity interface of a blade self-variable-pitch control system through a wiring, and when the angle rotates to a blade safety position at the speed of 9 degrees/s, the blade 101 is judged to execute an emergency back-pitching instruction; or the blade 101 has performed an emergency back-pitching, but the blade 101 has not been back-pitched to a preset safety position, the determination of the safety position is also determined by the encoder angle at the tail of the pitch motor 104, and when the angle is detected to return to the 90 ° position, it is determined that the safety position has been reached; in order to overcome the problems in the prior art, the angle value of the tail encoder of the variable-pitch motor 104 can be obtained, and a corresponding control instruction is output through calculation, so that the back-pitch operation is realized.
The other is caused by the mechanical system problem, namely the blockage of the variable pitch bearing 102 and the variable pitch reduction gearbox, the blockage of the variable pitch gear, three blades 101 are adopted for independent variable pitch of the main flow unit in the industry at present, the probability of mechanical failure of a plurality of blades 101 is extremely low, and when one blade 101 executes the back pitch instruction of the original control system, the rotating speed of the wind wheel can be reduced, and the galloping accident is avoided; or the above electrical system problem occurs in all three blades 101, the angle value of the tail encoder of the pitch motor 104 can be obtained, and the corresponding control instruction is output through calculation, so as to realize the back-pitching operation.
For step S1, namely, a step of acquiring angle change information when the blade 101 of the fan rotates under the action of wind force, specifically includes:
acquiring a pitch angle parameter set of the blade 101 when rotating under the action of wind power;
Monotonicity of the blade 101 angle change is determined from the set of pitch angle parameters.
The acquisition of the pitch angle of the blade 101 can be directly transmitted to an analog interface of a blade self-pitch control system through an encoder arranged at the tail part of the pitch motor 104, and the monotonicity of the angle change of the blade 101 can be determined through calculating an input pitch angle parameter set.
Aiming at the step S2, the step of controlling the opening and closing of the variable-pitch band-type brake on the fan according to the angle change information so as to enable the blade 101 to rotate to a preset safety position comprises the following steps:
When the angle of the blade 101 is monotonically changed, the variable pitch band-type brake is controlled to be opened, so that the blade 101 can continuously freely change pitch under the action of wind power; when the angle of the blade 101 is not monotonically changed, the variable pitch brake is controlled to be closed, the blade 101 immediately stops variable pitch, and after a preset time (which can be understood as a delay preset time, for example, 3 s), the variable pitch brake is exited, and free pitch is started again. The circulating control is performed in such a way that the blades 101 are gradually reduced under the action of wind power, so that the rotating speed of the wind generating set is effectively reduced.
After obtaining a pitch angle parameter set of the blade 101 when the blade 101 rotates under the action of wind power, taking the angle of the blade 101 as theta 1 when the blade 101 begins to change pitch at each time, and after the blade 101 is released, calculating the value of theta 2-θ1 in real time, wherein when 270 degrees is less than theta 2＜360°,θ2-θ1 and is a negative value, the angle of the blade 101 is monotonically changed and the angle of the blade 101 is monotonically decreased; when 0 DEG & lt, theta 2 & lt, 90 DEG, theta 2-θ1 is positive, the blade 101 angle is monotonically changing, and the blade 101 angle is monotonically increasing.
In the process of changing the angle of the blade 101, the angle of the blade 101 is monitored in real time, when the angle of the blade 101 returns to a set safety position, the pitch brake is controlled to be put in, and the fan is stopped; when the angle of the blade 101 does not return to the set safety position, the step of controlling the opening and closing of the variable-pitch band-type brake on the fan according to the angle change information is continuously executed until the blade 101 returns to the safety position, and the fan is stopped. The control is circulated until the blades 101 reach the preset safe position, so that the phenomenon that the rotating speed of the wind driven generator cannot be reduced under the action of wind force to cause the galloping accident of the wind turbine can be effectively avoided.
When the angle of the blade 101 is 90 °, the blade 101 is moved to 0 by the wind force, and the system automatically determines the safety position, or when the angle of the blade 101 is 270 °, the blade 101 is moved to 0 by the wind force, and the system automatically determines the safety position.
The invention provides a blade self-variable pitch control system, as shown in an attached figure 3 of the specification, comprising:
the acquisition module 1 is used for acquiring angle change information when the blades 101 of the fan rotate under the action of wind power;
The control module 2 is used for controlling the opening and closing of the variable pitch band-type brake on the fan according to the angle change information so as to enable the blade 101 to rotate to a preset safety position.
Further, the acquisition module 1 includes:
A pitch angle acquisition unit for acquiring a pitch angle parameter set when the blade 101 rotates under the action of wind power;
A determination unit for determining monotonicity of the angular variation of the blade 101 from the set of pitch angle parameters.
Still further, the control module 2 is specifically configured to:
If the angle of the blade 101 changes to be non-monotonic, the variable pitch brake is controlled to be closed, and after a preset time, the variable pitch brake is controlled to be opened so that the blade 101 can be rotated to a preset safety position under the action of wind power.
Of course, according to actual needs, the blade self-variable pitch control system can be specifically set as a PLC control system, when the control system controls the main loop control power supply of the variable pitch motor 104 to be automatically disconnected and the variable pitch band brake to be opened, the blade 101 can be free to rotate without any control force, and the rotating speed is reduced; when the blocking of the propeller is eliminated or the propeller control system is recovered to be normal, the control right is given to the propeller control system, the propeller control system executes a propeller returning instruction according to program setting, and finally safe shutdown is realized.
That is, the blade self-pitch control system establishes communication with the main control and pitch control system, and when the main control and pitch control system returns to normal, the control program of the blade self-pitch control system is terminated, the pitch control authority is given to the main control and pitch control system, and the pitch control is operated according to the program set by the main control and pitch control system.
Of course, according to actual needs, the above-mentioned acquisition module 1 specifically includes an encoder installed at the tail of the pitch motor 104, the control module 2 specifically includes a self-pitch controller 105, and the control system is further provided with a self-pitch control circuit connected with the self-pitch controller 105, so that the blade 101 is free from torsion and braking force of the pitch motor 104 and free to rotate under the wind force.
The electrical connection schematic diagram of the blade self-pitching control system is shown in fig. 4 of the specification, and comprises: a relay 7K1 for controlling the switching-in/out of the pitch-controlled band-type brake and a main power contactor 7K3 for controlling the switching-on/off of the pitch motor 104.
Wherein, the A1 port of the coil of the relay 7K1 is connected with a +DC24V power supply through a pitch system preamble control loop, and the A2 port is connected with the-DC 24V through a contact line; meanwhile, an A1 port of a coil of the relay 7K1 is connected with a +DC24V power supply through a group of normally open contacts K11 of the first relay K1 to form a control bypass; the input end of the A1 port of the coil A1 of the first relay K1 is connected with the self-variable pitch controller 105, and the A2 port is connected with a-DC 24V power supply.
The coil A1 port of the power supply main contactor 7K3 is connected with a pitch-controlled preamble control loop through a group of normally-closed contacts K21 of a second relay K2, and the A2 port is connected with-DC 24V through a contact line; the input end of the A1 port of the coil A2 of the second relay is connected with the self-variable pitch controller 105, and the A2 port is connected with a-DC 24V power supply.
The contact line includes: a set of normally open nodes (13, 14) of the first relay K1 are incorporated into the band-type brake control loop of the pitch motor 104, and a set of normally closed nodes (21, 22) of the second relay K2 are connected in series into the main contactor control loop of the pitch motor 104.
In this way, when the wind wheel rotating speed of the fan exceeds 16mrp, the fan overspeed can be judged, the fan is stopped emergently, the blade 101 is controlled to return to the paddle emergently, at this moment, the self-pitching control system starts to operate, the angle of the blade 101 and the wind wheel rotating speed are detected, if the blade 101 does not return to the paddle, the wind wheel rotating speed continuously rises, the control program of the self-pitching control system starts, the 4 # and the 5 # ports of the self-pitching controller 105 output +24V power supplies, the first relay K1 and the second relay K2 are controlled to act, namely the normally open auxiliary contact K11 of the first relay K1 is closed, the relay 7K1 is controlled to act, the paddle-changing contracting brake is opened, the normally closed auxiliary contact K21 is opened, the power main contactor 7K3 is in power failure, the paddle-changing motor 104 is in power failure, and the blade 101 starts to freely change paddles under the wind force. The self-pitching controller 105 monitors the angle change of the blade 101 in real time, and when the angle of the blade 101 changes monotonically, the blade 101 continues to pitch freely under the action of wind force; when the angle of the blade 101 is not monotonically changed, the No. 5 port of the self-pitching controller 105 stops outputting +24V power, the first relay K1 is controlled to lose electricity, the normally open auxiliary contact K11 is opened, the pitching band-type brake is closed, the blade 101 stops pitching, after 3 seconds of time delay, the No. 5 port of the self-pitching controller 105 continues outputting +24V power, the first relay K1 is controlled to conduct electricity, the normally open auxiliary contact K11 is closed, the pitching band-type brake is opened, free pitching is started again, and the cycle control is conducted until the angle of the blade 101 is 90 degrees or 270 degrees. When the system judges that the blade 101 reaches the safe position, the 4 # and 5 # ports of the self-pitching controller 105 stop outputting +24V power, the first relay K1 and the second relay K2 are controlled to lose electricity, the normally open auxiliary contact K11 is opened, the normally closed auxiliary contact K21 is closed, the self-pitching program is terminated, the pitch control authority is given to the main control and pitch control system, and the pitch is operated according to the set program of the main control and pitch control system.
On the basis, as shown in fig. 5 of the specification, the blade self-pitching control system further comprises a pitching bearing 102, a hub 103 and a pitching motor 104; the pitch bearing 102 is mounted on the hub 103, and the blade 101 is mounted on the pitch bearing 102 through a self-contained bolt and synchronously rotates along with the pitch bearing 102; the self-pitch controller 105 is used for controlling the pitch motor 104 to rotate; the pitch motor 104 is provided with a matched speed reducer, and is meshed with the pitch bearing 102 through a blade root gear to drive the blade 101 to rotate, and an encoder at the tail part of the pitch motor 104 is used for detecting the pitch angle of the blade; the ram device 106 and limit switch device 107 are used to detect whether the blade 101 is in a safe position (i.e., 90 ° or 270 ° position), or in a feathered position (i.e., 0 ° position). The structure of the other two blades is identical to that of the blade 101 and will not be repeated here.
The invention provides a blade self-variable pitch control device, which comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the blade self-pitching control method when executing the computer program.
The wind power generation equipment provided by the invention comprises the blade self-pitching control device described in the specific embodiment; other parts of the wind power plant may be referred to the prior art and are not developed herein.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The wind power generation equipment and the blade self-pitching control method, system and device thereof provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the inventive arrangements and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. An automatic blade pitch control method is characterized by comprising the following steps:
acquiring angle change information of a blade (101) of the fan when the blade rotates under the action of wind power;
Controlling a variable-pitch band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blade (101) to rotate to a preset safety position;
the step of obtaining the angle change information of the blade (101) of the fan when rotating under the action of wind force comprises the following steps:
Acquiring a pitch angle parameter set of the blade (101) when the blade rotates under the action of wind power;
Determining monotonicity of the blade (101) angle change from the set of pitch angle parameters;
The step of controlling the paddle change band-type brake on the fan to be opened and closed according to the angle change information so as to enable the blade (101) to rotate to a preset safety position comprises the following steps:
If the angle change of the blade (101) is non-monotonic, controlling the variable-pitch band-type brake to be closed, and controlling the variable-pitch band-type brake to be opened after a preset time so that the blade (101) can be rotated to the preset safety position under the action of wind power.
2. The method for automatically controlling pitch of blades according to claim 1, wherein the step of acquiring information on an angle change of the blade (101) of the wind turbine when the blade rotates under the action of wind force comprises:
when overspeed of a wind wheel of the fan is detected and the blade (101) does not execute emergency back-paddle action, a variable-pitch motor (104) on the fan is controlled to be closed and the variable-pitch band-type brake is controlled to be opened so that the blade (101) can rotate under the action of wind force.
3. The automatic pitch control method of a blade according to claim 2, wherein the preset safety position is in particular a position where the pitch angle of the blade (101) is 90 °.
4. An automatic pitch control system for a blade, comprising:
The acquisition module (1) is used for acquiring angle change information of the blades (101) of the fan when the blades rotate under the action of wind power;
The control module (2) is used for controlling the opening and closing of the variable-pitch band-type brake on the fan according to the angle change information so as to enable the blade (101) to rotate to a preset safety position;
the acquisition module (1) comprises:
A pitch angle acquisition unit for acquiring a pitch angle parameter set when the blade (101) rotates under the action of wind power;
a determination unit for determining monotonicity of the blade (101) angle change from the set of pitch angle parameters;
the control module (2) is specifically configured to:
If the angle change of the blade (101) is non-monotonic, controlling the variable-pitch band-type brake to be closed, and controlling the variable-pitch band-type brake to be opened after a preset time so that the blade (101) can be rotated to the preset safety position under the action of wind power.
5. An automatic pitch control device for a blade, comprising:
a memory for storing a computer program;
A processor for implementing the steps of the automatic blade pitch control method according to any one of claims 1 to 3 when executing the computer program.
6. A wind power plant comprising the automatic pitch control device for blades according to claim 5.
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| CN112922778B (en) * | 2021-03-17 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Yaw optimization method, system, equipment and storage medium for wind turbine generator |
| CN113062831B (en) * | 2021-04-12 | 2022-04-19 | 南通理工学院 | Power generation device for new energy hybrid power ship |
| CN113513448B (en) * | 2021-08-10 | 2024-02-20 | 天津明智润阳技术有限公司 | Variable-pitch brake control method for preventing galloping of wind generating set |
| CN113606085A (en) * | 2021-08-23 | 2021-11-05 | 哈电风能有限公司 | Yaw control method, controller and system based on failure condition of variable pitch system |
| CN114384897B (en) * | 2022-01-13 | 2024-04-12 | 华能酒泉风电有限责任公司 | Pitch system test system, method and device and readable storage medium |
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