CN113153630B - Wind turbine pitch control system - Google Patents
Wind turbine pitch control system Download PDFInfo
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- CN113153630B CN113153630B CN202110432030.XA CN202110432030A CN113153630B CN 113153630 B CN113153630 B CN 113153630B CN 202110432030 A CN202110432030 A CN 202110432030A CN 113153630 B CN113153630 B CN 113153630B
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- 238000004891 communication Methods 0.000 claims description 26
- 230000001133 acceleration Effects 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 15
- 230000007246 mechanism Effects 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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
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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
- 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
- F05B2270/60—Control system actuates through
- F05B2270/604—Control system actuates through hydraulic actuators
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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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- Engineering & Computer Science (AREA)
- 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)
- Wind Motors (AREA)
Abstract
The invention discloses a variable pitch control system of a wind generating set, relates to the technical field of wind power generation, and particularly relates to a variable pitch control system of a wind generating set. The device comprises a variable-pitch hydraulic system, a controller, a calibration switch, a calibration block, a grating encoder and a three-position four-way electromagnetic valve, wherein the variable-pitch control system controls an actuating mechanism of the variable-pitch hydraulic system through the three-position four-way valve to realize variable-pitch action. The pitch control system is further provided with a grating encoder, the grating encoder is used for acquiring pitch rotation angle information, the grating encoder is high in acquisition density of rotation signals, acquisition precision is high, and further control precision is more accurate. The calibration switch is used for determining a preset position, and the problem that the absolute angle acquired by the controller is inaccurate due to abnormal conditions such as reset, short dead time of the controller or interference generated in the process of transmitting signals between the grating encoder and the controller is prevented.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a variable pitch control system of a wind generating set.
Background
The wind generating set pitch system is used for adjusting the pitch angle of the blades, so that the wind generating set can be in an optimal working state, and is an important component of a safety system on the wind generating set, and the wind generating set can be ensured to be started and stopped normally and stopped emergently under special conditions. The wind generating set has about 70% of working time at a small angle for pitching, the precision of a required pitching system is high, the executing stroke of a pitching mechanism is short, and about 30% of working time at a large pitching angle, the response of the required pitching system is quick, and the executing stroke of the pitching mechanism is long.
Modern fans (doubly-fed, direct-driven, semi-direct-driven) almost all use fans with variable pitch, which is the variation of the vertical projection of the blades. In short, the blade is 0 ° when it is perpendicular to the ground, and 90 ° when it is horizontal. 90 ° to 0 ° is called feathering, and vice versa.
The output power of the fan increases along with the increase of the wind speed, when the wind speed is too high, if the fan blades are not retracted, the load on the whole fan can be very high, and the most serious accident is that the galloping falls down to the tower. When the wind speed is about 3-8 m/s, the blades are fully unfolded, when the wind speed exceeds 8 m/s (about 10 m/s is possible for a part of the unit), when the blades feathering, the stress of the whole blades is reduced, and the fan load is also reduced, but the output power is not reduced due to the wind speed, so that the rated output power can be ensured on the premise of ensuring the safety of the unit. Most fans can be fully feathered when the wind speed exceeds 20 m/s, and meanwhile, the fans stop running and yaw is carried out to ensure that the load of the unit is minimum.
In the prior art, the pitch control system adopts either a hydraulic pitch control mode, a control mode of changing the pitch of all blades simultaneously, or a control mode of independently changing the pitch of each blade, and the independent pitch control mode is increasingly toughed because corresponding adjustment can be made in time according to wind field uniformity and acceptance of a wind turbine.
In the realization of independent pitch, the driving wheel is usually external teeth, the pitch bearing is internal teeth, and the blades are fixed with the pitch bearing through bolts, hubs. In the independent variable pitch installation and use, the variable pitch mechanism can be because of various use factors for the inconsistent condition appears in each independent blade variable pitch angle, makes wind generating set produce tremble, generating set bearing abnormal wear for a long time, the even circumstances that the generating set damaged appear. For pitch angle precision adjustment, at present, the common means is to manually and regularly check and maintain, more manpower and material resources are required, and certain inconvenience and safety problems are brought to operation due to higher installation position of the wind generating set.
Disclosure of Invention
The invention provides a pitch control system of a wind generating set, which is used for solving the problem that manpower is used for adjusting pitch precision to take time and labor.
The invention adopts the following technical scheme:
a pitch control system of a wind generating set comprises a pitch hydraulic system, a controller, a calibration switch, a calibration block, a grating encoder and a three-position four-way electromagnetic valve;
The wind generating set is provided with a variable-pitch bearing, the variable-pitch bearing comprises a moving coil and a static coil, the calibration switch is arranged on the static coil, the calibration block is arranged on the moving coil, the calibration switch is used for collecting preset variable-pitch angle information, the grating encoder is used for collecting hub rotation information, the three-position four-way valve is used for controlling the variable-pitch hydraulic system to implement variable-pitch action, the controller is used for receiving the preset variable-pitch angle information and the hub rotation information, and the controller is also used for controlling the three-position four-way valve to implement variable-pitch action through the variable-pitch hydraulic system;
the calibration switch, the grating encoder and the three-position four-way electromagnetic valve are respectively and electrically connected with the controller.
Further, the moving coil is provided with a sliding groove and a set screw, the sliding groove is fixedly connected with the moving coil, the calibration block is in sliding connection with the sliding groove, and the set screw is used for tightly fixing the calibration block on the sliding groove.
The device further comprises a GPRS communication module and a server, wherein the server is used for monitoring the pitch angle information, the server is also used for sending a pitch angle instruction to the controller, the GPRS communication module is used for establishing communication connection between the controller and the server, and the GPRS communication module is respectively in communication connection with the controller and the server.
The wind turbine generator system further comprises an acceleration sensor, wherein the acceleration sensor is fixedly connected with the wind turbine generator system, the acceleration sensor is used for collecting vibration information of the wind turbine generator system, the controller is further used for transmitting the received vibration information of the wind turbine generator system to the server through the GPRS communication module, and the acceleration sensor is electrically connected with the controller.
Further, the variable pitch hydraulic system is provided with an energy accumulator, the motor is used for providing kinetic energy for the variable pitch hydraulic control system, the pressure gauge is used for collecting the pressure of the variable pitch hydraulic system, the controller is further used for controlling the motor to start or stop when the pressure of the variable pitch hydraulic system reaches a threshold value, and the pressure gauge and the motor are respectively and electrically connected with the controller.
Further, the motor power supply system further comprises a super capacitor, wherein the super capacitor is used for providing power for the controller, the GPRS communication module and the motor.
Further, the calibration switch is a hall switch, and the calibration block is a magnet.
The invention has the following positive effects:
A pitch control system of a wind generating set controls a pitch hydraulic system executing mechanism through a three-position four-way valve to realize pitch action, the control mode is simple and reliable, and for the three-position four-way valve with an O-shaped middle position function, the middle position function can realize locking of blades after pitch. The pitch control system is also provided with a grating encoder, the grating encoder is used for acquiring pitch rotation angle information, the intensity of rotation signals acquired by the grating encoder is high, thousands of signals can be transmitted in a circle of rotation, so that the acquisition precision is high, and further, the control precision is more accurate. The calibration switch is used for determining a preset position, and the problem that the absolute angle acquired by the controller is inaccurate due to abnormal conditions such as reset, short dead time of the controller or interference generated in the process of transmitting signals between the grating encoder and the controller is prevented.
The calibration block of the variable-pitch control system is in sliding connection with the moving coil through the sliding groove, when the variable-pitch system needs to be adjusted, only the relative position of the calibration block and the moving coil needs to be adjusted, compared with the prior art, the variable-pitch control system is mechanically adjusted, the adjustment is more labor-saving, the adjustment efficiency is high, and the precision is high.
The wind generating set pitch control system is also provided with a server and a GPRS module, a worker can remotely monitor pitch angle information of the wind generating set, and can also send a remote control instruction to the controller through the server and the GPRS module to require the wind generating set to pitch according to the angle appointed by the instruction, so that emergency test is carried out on severe weather and emergency maintenance such as sudden, and the wind generating set is not required to be operated on site.
The acceleration sensor is used for collecting vibration information of the wind generating set, the vibration information is sent to the controller, when the vibration information exceeds a threshold value, the controller controls the feathering pitching action of the pitching system, so that unnecessary loss is avoided, the vibration information is further sent to the server through the GPRS module, a server side worker receives the vibration information and can carry out simple analysis and judgment, if necessary, the root cause of the problem of vibration is found out by the person on site investigation, and if the cause of the problem is determined, the problem is solved.
The variable pitch hydraulic system is provided with the energy accumulator, the hydraulic pressure is stable, the ripple is small, the variable pitch control system controls the motor of the variable pitch hydraulic system, the motor stops rotating when no extra pressure is needed to be provided, the unloading of the motor is realized, the hydraulic oil of the hydraulic system is prevented from heating, aging and deteriorating, and the electric energy is saved. The energy accumulator can still provide kinetic energy for realizing pitch control when power supply is stopped from outside.
The pitch control system of the wind generating set is further provided with the super capacitor, the super capacitor is used for providing electric energy for the controller, the GPRS communication module and the motor when the power supply is stopped externally, and the super capacitor and the energy accumulator are double-insurance, so that safe operation of equipment can be guaranteed under emergency conditions.
The calibration switch for calibrating the reference angle is a Hall switch, the matched calibration block is a magnet, and the calibration block and the calibration switch are not contacted, so that abrasion is not generated, the service life is long, and the device is suitable for being used under severe working conditions and outdoor working conditions.
Drawings
FIG. 1 is a schematic diagram of a pitch hydraulic system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a pitch system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control system according to an embodiment of the present invention.
In the figure:
Calibrating the switch 1;
A calibration block 2;
A grating encoder 3;
A three-position four-way electromagnetic valve 4;
A moving coil 5;
a stationary ring 6;
a chute 5-1;
a set screw 7;
a motor 8;
A pressure gauge 9;
An accumulator 10.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
1-3, A pitch control system of a wind generating set comprises a pitch hydraulic system, a controller, a calibration switch 1, a calibration block 2, a grating encoder 3 and a three-position four-way electromagnetic valve 4;
The wind generating set is provided with a pitch bearing, the pitch bearing comprises a moving coil 5 and a static coil 6, the calibration switch 1 is arranged on the static coil 6, the calibration block 2 is arranged on the moving coil 5, the calibration switch 1 is used for collecting preset pitch angle information, the grating encoder 3 is used for collecting hub rotation information, the three-position four-way valve is used for controlling the pitch hydraulic system to implement pitch action, the controller is used for receiving the preset pitch angle information and the hub rotation information, and the controller is also used for controlling the three-position four-way valve to implement pitch action through the pitch hydraulic system;
the calibration switch 1, the grating encoder 3 and the three-position four-way electromagnetic valve 4 are respectively and electrically connected with the controller.
More specifically, the blade of the wind generating set is arranged on a hub, the hub is arranged on an inner ring or an outer ring of a variable pitch bearing, the variable pitch action of the blade of the wind generating set is realized by rotating the variable pitch bearing, and the hub is fixedly connected with the inner ring of the variable pitch bearing in the embodiment.
The power source for rotating the inner ring of the variable-pitch bearing has various forms, such as a mode of combining the motor 8 with a speed reducer, a mode of driving a hydraulic motor, a mode of driving a hydraulic cylinder and the like, and the technical scheme of the embodiment is that the hydraulic motor or the hydraulic cylinder drives the inner ring of the variable-pitch bearing to rotate by a power output end of the hydraulic motor or the hydraulic cylinder, so that the variable-pitch action is realized.
The three-position four-way valve is provided with two working ports, namely a working port A and a working port B, which are respectively communicated with a first oil port of the hydraulic cylinder or the hydraulic motor, and a working port B which is respectively communicated with a second oil port of the hydraulic cylinder or the hydraulic motor, and is also provided with two system ports, namely a pressure port P and an oil return port T, which are respectively communicated with a hydraulic pressure pipeline and a hydraulic oil return pipeline.
When the pressure port P of the three-position four-way valve is communicated with the working port A, the oil return port T is communicated with the working port B, the hydraulic motor or the hydraulic cylinder performs a first-direction action, the output shaft of the hydraulic motor rotates in the first direction, and the oil cylinder rod performs a first-direction push-pull action for the hydraulic cylinder, so that the blade is changed into a first-direction paddle.
When the pressure port P port of the three-position four-way valve is communicated with the working port B, the oil return port T is communicated with the working port A, the hydraulic motor or the hydraulic cylinder performs a second-direction action, the output shaft of the hydraulic motor rotates in the second direction, and the oil cylinder rod performs a second-direction push-pull action for the hydraulic cylinder, so that the blade is changed to the first direction.
Obviously, the blade pitch of the wind generating set is continuously variable and can be adjusted to a specified angle according to wind power, so that the inner ring or the outer ring of the pitch bearing is provided with a grating encoder 3 in transmission connection with the inner ring or the outer ring of the pitch bearing, and the grating encoder 3 is used for determining the moment when the hydraulic motor or the hydraulic cylinder should stop acting by collecting the rotation angle of the inner ring or the outer ring. The grating encoder 3 is composed of a photoelectric code disc with a central shaft, and annular through and dark score lines are arranged on the photoelectric code disc, when the disc rotates by one pitch, the photosensitive element obtains A signals and B signals which are sine waves with 90-degree phase difference under the irradiation of the light-emitting element, the signals are amplified and shaped by an amplifier to obtain output square waves, and the voltage amplitude of the A signals is generally 5V before the B signals are led by 90 degrees. When the phase B before the phase A is guided is set to rotate in the positive direction, the phase A before the phase B is guided is set to rotate in the negative direction, the phase relation between the phase A and the phase B can be used for judging the positive rotation and the negative rotation of the encoder, the pulse generated by the phase C is a reference pulse, also called zero pulse, which is a pulse generated by the rotation of the shaft at a fixed position, and the zero reference position of the encoder can be obtained. After the AB phase pulse signal is subjected to frequency-voltage conversion, a voltage signal proportional to the rotating speed of the rotating shaft is obtained, and the speed value and the displacement can be measured.
The rotation angle signal collected by the grating encoder 3 is sent to a controller, and the controller determines the switching time of the three-position four-way valve according to the angle signal and a preset value.
The grating encoder 3 is usually of two types, namely an incremental encoder which can only generate an angular rotation signal and cannot determine its existing angle, and an absolute encoder which can give the absolute value determined by the current encoder, as the name implies. However, in this embodiment, the absolute encoder arrangement seems to be more suitable, but due to the poor working environment of the encoder, the obtained angle sometimes cannot be correct after a plurality of operations, or because of the error coding information value caused by certain factors, such as a short dead halt of the controller or interference in the signal transmission process, so that the measured absolute angle is deviated, but for the wind generating set, the phenomenon is absolutely impermissible, damage is caused to the set due to light weight, and serious safety accident occurs.
Therefore, as a supplement to the angle measurement value, a calibration switch 1 and a calibration block 2 are provided, and the calibration switch 1 and the calibration block 2 are used for obtaining a predetermined angle value, and the angle of the operation of the calibration switch 1 is a predetermined angle.
The pitch system is calibrated by means of the calibration switch 1 on a regular basis and in the event of an abnormality such as a reset. The predetermined angle at which the calibration switch 1 is set is typically the feathering angle, i.e. the position where the blade is parallel to the ground. When calibration is needed, the controller controls the three-position four-way valve, so that the hydraulic motor or the hydraulic cylinder continuously changes the propeller in the feathering direction, when the preset angle is reached, the calibration switch 1 acts relative to the calibration block 2, and the controller controls the three-position four-way valve to lock the full feathering angle of which the current position is the absolute position.
When the pitch is changed, the three-position four-way valve is controlled to change the pitch according to a preset value, the grating encoder 3 continuously gives out a rotation angle signal in the pitch changing process, the controller accumulates the received rotation signals until the preset value is reached, and the controller controls the three-position four-way valve to stop changing the pitch of the blades, and the pitch changing is finished.
The pitch control system controls the actuating mechanism of the pitch hydraulic system through the three-position four-way valve, so that pitch action is realized, the control mode is simple and reliable, and for the three-position four-way valve with the O-shaped middle position function, the middle position function can lock the blades after pitch. The pitch control system is further provided with the grating encoder 3, the grating encoder 3 is used for collecting pitch rotation angle information, the density of rotation signals collected by the grating encoder 3 is high, thousands of signals can be sent out in a circle of rotation generally, so that the collection precision is high, and further the control precision is more accurate. The calibration switch 1 is used for determining a preset position, and prevents the problem that the absolute angle acquired by the controller is inaccurate due to abnormal conditions such as reset, short dead time of the controller or interference generated in the process of transmitting signals between the grating encoder 3 and the controller.
Further, the moving coil 5 is provided with a sliding groove 5-1 and a set screw 7, the sliding groove 5-1 is fixedly connected with the moving coil 5, the calibration block 2 is slidably connected with the sliding groove 5-1, and the set screw 7 is used for tightly fixing the calibration block 2 on the sliding groove 5-1.
More specifically, after the wind generating set is installed, debugged or maintained, a certain deviation is usually generated in the reference angle, for example, the feathering angle is an angle of the blade parallel to the ground, so that the resistance of the blade to the air flow is minimum, and if the reference angle is deviated, the resistance of the blade to the air flow acts on the wind generating set when the feathering is required to resist strong wind, and the generated damage is huge.
Therefore, it is necessary to adjust the reference angle after installation, debugging, or maintenance.
The moving coil 5 is a variable-pitch bearing ring connected with a hub, the hub in the embodiment is a variable-pitch bearing inner ring, a chute 5-1 is arranged on the inner ring, the calibration block 2 is in sliding connection with the chute 5-1, and the set screw 7 is used for fixedly connecting the calibration block 2 with the chute 5-1. When calibration is needed, the set screw 7 is loosened, then the blade is rotated through the pitch system until the angle of the blade reaches an ideal reference angle, and then the set screw 7 is tightened to lock the calibration block 2.
The calibration block 2 of the pitch control system is in sliding connection with the moving coil 5 through the sliding groove 5-1, when the pitch control system needs to be adjusted, only the relative positions of the calibration block 2 and the moving coil 5 need to be adjusted, compared with the prior art, the pitch control system is mechanically adjusted, the adjustment is more labor-saving, the adjustment efficiency is high, and the precision is high.
The device further comprises a GPRS communication module and a server, wherein the server is used for monitoring the pitch angle information, the server is also used for sending a pitch angle instruction to the controller, the GPRS communication module is used for establishing communication connection between the controller and the server, and the GPRS communication module is respectively in communication connection with the controller and the server.
More specifically, the GPRS module is configured to establish a communication connection between the controller and the server, where the server is used as a control core for uniformly controlling a plurality of wind turbine generator sets and a core for recording operation data, and for this embodiment, the server is configured to detect and record pitch angle information of the wind turbine generator sets, and further is configured to issue a pitch angle signal. In this embodiment, the GPRS communication module is SIM800C, and the communication module is a four-frequency gsm/GPRS module. The performance is stable, the appearance is small and exquisite, the cost performance is high, and various requirements of customers can be met. The SIM800C has the working frequency of gsm/gprs 850/900/1800/1900MHz, and can realize the transmission of voice, short messages, data and fax information with low power consumption.
The angle information acquired by the controller through the grating encoder 3 is sent to the server through the GPRS module at regular intervals, and the angle information is displayed and recorded at the server side. The server may also send control commands to the controller via the GPRS module, requiring the controller to pitch at the angle specified by its command, which is typically used to handle upcoming bad weather, or temporary maintenance, or periodic testing.
The wind generating set pitch control system is also provided with a server and a GPRS module, a worker can remotely monitor pitch angle information of the wind generating set, and can also send a remote control instruction to the controller through the server and the GPRS module to require the wind generating set to pitch according to the angle appointed by the instruction, so that emergency test is carried out on severe weather and emergency maintenance such as sudden, and the wind generating set is not required to be operated on site.
The wind turbine generator system further comprises an acceleration sensor, wherein the acceleration sensor is fixedly connected with the wind turbine generator system, the acceleration sensor is used for collecting vibration information of the wind turbine generator system, the controller is further used for transmitting the received vibration information of the wind turbine generator system to the server through the GPRS communication module, and the acceleration sensor is electrically connected with the controller.
More specifically, the wind generating set is affected by the outside to generate abnormal vibration, such as uneven wind field or rapid change of wind direction, or inconsistent blade pitch angle, and the vibration has serious harm to the wind generating set and should be found and corrected in time.
The acceleration sensor is used for collecting vibration information of the wind generating set, the vibration information is sent to the controller, when the vibration information exceeds a threshold value, the controller controls the feathering pitching action of the pitching system, so that unnecessary loss is avoided, the vibration information is further sent to the server through the GPRS module, a server side worker receives the vibration information and can carry out simple analysis and judgment, if necessary, the root cause of the problem of vibration is found out by the person on site investigation, and if the cause of the problem is determined, the problem is solved.
Further, the variable pitch hydraulic system further comprises an electric motor 8 and a pressure gauge 9, wherein the variable pitch hydraulic system is provided with an energy accumulator 10, the electric motor 8 is used for providing kinetic energy for the variable pitch hydraulic control system, the pressure gauge 9 is used for collecting the pressure of the variable pitch hydraulic system, the controller is further used for controlling the electric motor 8 to start or stop when the pressure of the variable pitch hydraulic system reaches a threshold value, and the pressure gauge 9 and the electric motor 8 are respectively and electrically connected with the controller.
Further, a super capacitor is included, and the super capacitor is used for providing electric energy for the controller, the GPRS communication module and the motor 8.
More specifically, the pitch hydraulic system is further provided with an accumulator 10 and a pressure gauge 9, the motor 8 is used for providing kinetic energy for the hydraulic system, the motor 8 is controlled by the controller, when the pressure of the hydraulic system is higher than a pressure threshold value of the hydraulic system, the controller controls the motor 8 to stop rotating, the accumulator 10 provides pressure for the hydraulic system, and when the pressure of the hydraulic system is lower than the threshold value, the controller controls the motor 8 to start and provide pressure for the accumulator 10 and the hydraulic system.
The hydraulic system provided with the energy accumulator 10 has stable hydraulic pressure and small ripple, realizes the stop of the motor 8 when the pressure is not needed, realizes the unloading of the motor 8, avoids the heating, aging and deterioration of hydraulic oil of the hydraulic system, and saves electric energy. The accumulator 10 is still able to provide kinetic energy for achieving pitch when the external power supply is stopped.
The pitch control system of the wind generating set is further provided with the super capacitor, the super capacitor is used for providing electric energy for the controller, the GPRS communication module and the motor 8 when the power supply is stopped externally, and the super capacitor and the energy accumulator 10 are double-insurance, so that the safe operation of equipment can be ensured under emergency conditions.
Further, the calibration switch 1 is a hall switch, and the calibration block 2 is a magnet.
More specifically, the calibration switch 1 is a Hall switch, the matched calibration block 2 is a magnet, and the calibration block 2 and the calibration switch 1 are not contacted, so that abrasion is not generated, the service life is long, and the device is suitable for being used under severe working conditions and outdoor working conditions.
The above described embodiments are only preferred examples of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications thereof, which would be apparent to those skilled in the art without departing from the principles and spirit of the present invention, should be considered to be included within the scope of the appended claims.
Claims (6)
1. A pitch control system of a wind generating set comprises a pitch hydraulic system and is characterized by further comprising a controller, a calibration switch (1), a calibration block (2), a grating encoder (3) and a three-position four-way electromagnetic valve (4), wherein the wind generating set is provided with a pitch bearing, the pitch bearing comprises a moving coil (5) and a static coil (6), the calibration switch (1) is arranged on the static coil (6), the calibration block (2) is arranged on the moving coil (5), the calibration switch (1) is used for acquiring preset pitch angle information, the grating encoder (3) is used for acquiring hub rotation information, the three-position four-way valve is used for controlling the pitch hydraulic system to implement pitch motion, the controller is further used for controlling the three-position four-way valve to implement pitch motion through the pitch hydraulic system, the calibration switch (1), the grating encoder (3) and the three-position four-way valve are respectively connected with the moving coil (5) and the fixed chute (5-5) through the fixed chute (5), the set screw (7) is used for tightly fixing the calibration block (2) on the chute (5-1), and the grating encoder (3) is provided with an optoelectronic code disc with a shaft at the center and an annular through and dark scribing line.
2. The wind generating set pitch control system as recited in claim 1, further comprising a GPRS communication module and a server, wherein the server is used for monitoring pitch angle information, the server is further used for issuing a pitch angle instruction to the controller, the GPRS communication module is used for establishing communication connection between the controller and the server, and the GPRS communication module is respectively in communication connection with the controller and the server.
3. The wind generating set pitch control system according to claim 2, further comprising an acceleration sensor, wherein the acceleration sensor is fixedly connected with the wind generating set, the acceleration sensor is used for collecting vibration information of the wind generating set, the controller is further used for transmitting the received vibration information of the wind generating set to the server through the GPRS communication module, and the acceleration sensor is electrically connected with the controller.
4. A wind turbine generator system pitch control system according to claim 3, further comprising an electric motor (8) and a pressure gauge (9), the pitch hydraulic system being provided with an energy accumulator (10), the electric motor (8) being adapted to provide kinetic energy to the pitch hydraulic control system, the pressure gauge (9) being adapted to collect the pitch hydraulic system pressure, the controller being further adapted to control the electric motor (8) to start or stop when the pitch hydraulic system pressure reaches a threshold value, the pressure gauge (9) and the electric motor (8) being electrically connected to the controller, respectively.
5. The wind turbine pitch control system of claim 4, further comprising a super capacitor for providing electrical power to the controller, the GPRS communication module and the motor (8).
6. The pitch control system of a wind turbine generator system according to claim 5, wherein the calibration switch (1) is a hall switch and the calibration block (2) is a magnet.
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| CN205401002U (en) * | 2016-03-11 | 2016-07-27 | 北京天诚同创电气有限公司 | Aerogenerator impeller azimuth measuring device |
| CN208669516U (en) * | 2018-08-29 | 2019-03-29 | 黑龙江省华富电力投资有限公司 | Wind turbines electric pitch-changing system motor executing agency |
| CN109595128B (en) * | 2018-12-13 | 2019-10-08 | 重庆华昭电气设备有限公司 | A kind of vane propeller-changing angle precision calibration equipment and method |
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