CN101915206A - Variable pitch control unit and device thereof for wind driven generator - Google Patents
Variable pitch control unit and device thereof for wind driven generator Download PDFInfo
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- CN101915206A CN101915206A CN201010248386XA CN201010248386A CN101915206A CN 101915206 A CN101915206 A CN 101915206A CN 201010248386X A CN201010248386X A CN 201010248386XA CN 201010248386 A CN201010248386 A CN 201010248386A CN 101915206 A CN101915206 A CN 101915206A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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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- 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
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention provides a variable pitch control unit and a device thereof for a wind driven generator of an AC asynchronous motor. The device comprises a three-phase AC power source, a servo controller, a standby DC power source and an AC asynchronous motor, wherein the output end of the three-phase AC power source is connected with the input end of a servo power source; the servo controller comprises the servo power source, a servo driver and a control switch subunit, the output end of the servo power source is connected with the input end of the servo driver, and the output end of the servo driver is connected with the AC asynchronous motor; the anode of the standby DC power source is connected with the anode of a switching diode, the cathode of the standby DC power source is connected with the input end of the servo driver, and the cathode of the switching diode is connected with the output end of the servo power source; the signal output end of the servo driver is connected with the control switch subunit; and the AC asynchronous motor is connected with the three-phase AC power source through the control switch subunit. A feathering operation is completed through the AC asynchronous motor under the condition of electric power failure or servo controller failure.
Description
Technical field
The present invention relates to a kind of change oar control gear of wind-driven generator, particularly adopt the variable pitch control unit and the device thereof of the wind-driven generator of AC induction motor.
Background technique
Pitch-controlled system is the key link that ensures the wind-driven generator overall security, and wind-driven generator carries out power adjustments by the blade angle of regulating pitch-controlled system in the course of the work.In order to ensure the general safety of wind-driven generator, must under the situation that any fault occurs, all to guarantee blade reliably feathering and skidding.Feathering is exactly to regulate blade to rotate to the direction of an angle of 90 degrees, makes rotation speed of fan descend, and the feathering failure may make blower fan bring gear-box damage even pylon catastrophic effect such as collapse.
Existing pitch-controlled system generally adopts actuating motor to carry out blade and drives, and actuating motor carries out servocontrol to blade.So-called servocontrol is meant the effective control to the motion of object, and the actuating motor in the pitch-controlled system is controlled speed, position, acceleration that blade rotates, and the actuating motor in the pitch-controlled system can be divided into AC servo motor and DC servo motor.DC servo motor can be further divided into brush motor and brushless electric machine.AC servo motor belongs to brushless electric machine, and it can be further divided into synchronously and asynchronous motor.
At present, pitch-controlled system in the wind-power electricity generation adopts DC servo motor to drive the blade feathering more, the advantage of DC servo motor is to make variable blade control system to realize reliable feathering, when the primary power source de-energizes fault occurring, because DC servo motor adopts standby DC power supply, therefore the armature winding of motor can be received standby power supply carries out feathering, need not other conversion equipments, but direct current generator has the maintenance and the reliability problem of unstable of reversing arrangement.And existing AC motor scheme is when the ac power supply power down, must just can obtain electric energy finishing feathering by the electronic power inversion device, Duoed an inversion link than the direct current scheme, thereby reduced the reliability of feathering.
As Chinese patent application " feather control gear " (application number: 200420002630.4), the use standby power supply is disclosed, make blade reliable feathering under fortuitous events such as electric network power-fail, guarantee the method for unit safety, but it does not consider that servocontroller when breaking down, can't finish the situation of feathering.
In order to solve the problems of the technologies described above, promptly take into account the break down normal running of the variable blade control system under two kinds of situations of electric network power-fail and servocontroller simultaneously, as Chinese invention patent application " a kind of redundancy control system and method that is used for wind-powered electricity generation generating change oar " (application number: 200910090287.0), a kind of variable blade control system is disclosed, comprise: three cover variable blade control systems, wherein every cover variable blade control system further comprises: servocontroller, change oar motor, standby DC electrical source, main contactor group and braking device.Yet, since increased in the system many redundancy control circuits (such as, main contactor group and braking device) etc., thereby greatly increased the fabricating cost of system and the design difficulty of circuit system.
Furthermore, the general more complicated of the manufacturing process of DC servo motor, and cost is also higher.Along with grid connected wind power installation total capacity constantly increases, need constantly improve reliability, the Security of pitch-controlled system, and require to reduce manufacturing, control cost.Therefore, in pitch-controlled system, AC servo motor replaces DC servo motor has gradually become a kind of unmodifiable trend.Compare with DC servo motor, AC servo motor, it is simple to have manufacturing process, and cost is low, non-maintaining characteristics.But AC induction motor can not be directly connected to standby DC electrical source feathering when the servo driver fault, and this is the potential safety hazard that AC induction motor is applied to pitch-controlled system.The actuating motor of the disclosed a kind of variable blade control system of therefore, Chinese invention patent application " a kind of redundancy control system and method that is used for wind-powered electricity generation generating change oar " also can't adopt AC induction motor.
Therefore, related domain needing to demand a kind of change oar control gear that adopts the wind-driven generator of AC induction motor urgently, it can be under electric network power-fail or servocontroller break down situation, AC induction motor can proper functioning, continuing to finish the variable blade control system of feathering work, and the design complexities of this variable blade control system and manufacture cost are all lower.
In sum, in the blower variable-pitch system, as long as can improve the feathering reliability of AC machine drive system under disconnection fault, AC motor system just can replace direct current motor system, farthest brings into play the advantage of AC Driving System.
Summary of the invention
The object of the present invention is to provide can be under electric network power-fail or servocontroller break down situation, finish the variable pitch control unit and the device thereof of feathering operation by AC induction motor, and the design complexities of this variable blade control system and manufacture cost are all lower.
The invention provides a kind of variable pitch control unit that adopts the wind-driven generator of AC induction motor, comprise: three-phase alternating-current supply, servocontroller, standby DC electrical source and AC induction motor, the output terminal of described three-phase alternating-current supply is connected to the input end of described servo power supply; It is characterized in that: described servocontroller comprises: servo power supply, servo driver and control switch subelement, the positive and negative output terminal of wherein said servo power supply is connected to the positive and negative input end of described servo driver, and the output terminal of described servo driver is connected to described AC induction motor; The positive pole of described standby DC electrical source is connected to the anode of switching diode, and the negative pole of described standby DC electrical source is connected to the input end of described servo driver, and the negative electrode of described switching diode is connected to the positive output end of described servo power supply; The signal output part of described servo driver is connected to described control switch subelement; And described AC induction motor is connected to described three-phase alternating-current supply by described control switch subelement.
Further, described servo driver comprises programmable controller.
Further, described control switch subelement comprises: first control switch and second control switch.
Further, described first control switch and described second control switch are relay switches.
Further, described relay switch comprises coil and contact.
The present invention also provides a kind of change oar control gear that adopts the wind-driven generator of AC induction motor, it is characterized in that: comprising: the above-mentioned variable pitch control unit of at least two covers.
Further, this variable blade control system comprises: the described variable pitch control unit of three covers, described three cover variable pitch control units further comprise: first variable pitch control unit, second variable pitch control unit and the 3rd variable pitch control unit, wherein: first variable pitch control unit comprises first servocontroller, first AC induction motor, the first standby DC electrical source, the first control switch subelement and first switching diode, second variable pitch control unit comprises second servocontroller, second AC induction motor, the second standby DC electrical source, the second control switch subelement and second switch diode, and the 3rd variable pitch control unit comprises the 3rd servocontroller, the 3rd AC induction motor, the 3rd standby DC electrical source, the 3rd control switch subelement and the 3rd switching diode; It is characterized in that: described first servocontroller, described second servocontroller and described the 3rd servocontroller are connected to same three-phase alternating-current supply respectively; And described first AC induction motor, described second AC induction motor and described the 3rd AC induction motor are connected to same described three-phase alternating-current supply by the described first control switch subelement, the described second control switch subelement and described the 3rd control switch subelement respectively.
Further, the output terminal of described three-phase alternating-current supply is connected to first servo power supply respectively, the input end of second servo power supply and the 3rd servo power supply, described first servo power supply comprises first servo power supply and first servo driver, wherein said first servo driver has first interface end and second interface end, described second servo power supply comprises second servo power supply and second servo driver, wherein said first servo driver has second interface end and second interface end, described the 3rd servo power supply comprises the 3rd servo power supply and the 3rd servo driver, and wherein said the 3rd servo driver has first interface end and second interface end; Also comprise: principal controller, wherein: first interface end of described first servo driver is connected to described principal controller, second interface end of described first servo driver is connected to first interface end of described second servo driver, second interface end of described second servo driver is connected to first interface end of described the 3rd servo driver, and second interface end of second interface end of described first servo driver and described the 3rd servo driver all is connected a terminal resistance simultaneously.
Further, first interface end of second interface end of described first servo driver, described second servo driver and second interface end, described the 3rd servo driver have first interface end and second interface end all is the CAN interface end.
The change oar control gear of the wind-driven generator of employing AC induction motor provided by the invention under the situation of electric network power-fail, is that the AC induction motor power supply guarantees finishing of feathering by standby DC electrical source by servo driver; Under the situation that servo driver breaks down, the AC motor of servo unit connection therewith is directly connected to electrical network to carry out feathering, other servo units carry out feathering with top speed control blade simultaneously, thereby can solving AC induction motor, variable blade control system of the present invention when servo driver fault, electric network power-fail, can not be directly connected to the problem that standby DC electrical source is carried out feathering, this scheme is guaranteed the safe feathering of blower fan, prevents the generation of accidents such as driving.
In addition, because it is simple that AC induction motor has manufacturing process, cost is low, non-maintaining characteristics, in pitch-controlled system, use AC motor not only can save cost, also safeguard characteristics such as simple to operation according to having, therefore the change oar control gear of the wind-driven generator of employing AC induction motor provided by the invention has advantages such as reliability height, design complexities and manufacture cost are all lower, thereby can improve the competitiveness of product in market.
Description of drawings
Fig. 1 is a structured flowchart, and the variable pitch control unit of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown;
Fig. 2 is a structured flowchart, and the control switch subelement in the variable pitch control unit in accordance with a preferred embodiment of the present invention is shown;
Fig. 3 is a system block diagram, and the change oar control gear of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown, and wherein this system comprises three described variable pitch control units;
Fig. 4 is a system architecture diagram, the change oar control gear of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown, wherein three described variable pitch control units in this system are connected to three-phase alternating-current supply respectively, and are connected to principal controller;
Fig. 5 is a structured flowchart, and a plurality of control switch annexations in the change oar control gear in accordance with a preferred embodiment of the present invention are shown.
Reference character:
Fig. 1:
11 three-phase alternating-current supplies, 12 servo power supplies, 13 servo drivers, 14 standby DC electrical source
15 AC induction motor, 16 servocontroller K1 control switch subelements
The D1 switching diode
Fig. 2:
The KA first control switch KB second control switch
Fig. 3:
21 first variable pitch control units, 22 second variable pitch control units 23 the 3rd variable pitch control unit
1 first servocontroller, 4 first AC induction motor, 7 first standby DC electrical source
2 second servocontrollers, 5 second AC induction motor, 8 second standby DC electrical source
3 the 3rd servocontrollers 6 the 3rd AC induction motor 9 the 3rd standby DC electrical source
The K11 first control switch subelement K12 second control switch subelement K13 the 3rd control switch subelement
The D1 first switching diode D2 second switch diode D3 the 3rd switching diode
Fig. 4:
211 first servo power supplies, 212 first servo drivers
221 second servo power supplies, 222 second servo drivers
231 the 3rd servo power supplies 232 the 3rd servo driver
Fig. 5:
51 bus failure switches
52 servo 3 breakdown switches, 53 servo 2 breakdown switches, 54 servo 1 breakdown switches
Embodiment
Variable pitch control unit and system thereof for wind-driven generator that the employing AC induction motor that the present invention proposes is described clearly and completely, so that those of ordinary skills can realize, provide preferred embodiment below and be described in further detail in conjunction with the accompanying drawings.
Book content for the purpose of simplifying the description, with the difference of embodiment in outstanding the present patent application and prior art and to the creative contribution part of prior art, when the embodiment in the present patent application is described, omitted the description of the aspects such as technical characteristics, parts, element, structure, annexation, function and principle that have with immediate prior art, described in detail and only it is different from the prior art part.Especially, omitted disclosed correlation technique content in the application's background technique part and the citing document.But should be understood that technological scheme of the present invention is not breaking away from the spirit and scope of the invention not as limit, any conspicuous change, revise, be equal to replacement etc., all be considered as falling within the protection domain of the application's claim.
See also Fig. 1, it is a structured flowchart, and the variable pitch control unit of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown.Described variable pitch control unit comprises: three-phase alternating-current supply 11, servocontroller 16, standby DC electrical source 14 and AC induction motor 15, output terminal U, the V of described three-phase alternating-current supply 11, W are connected to input end X21:L1, X21:L2, the X21:L3 of described servo power supply 12.
Electrical network is as three-phase alternating-current supply commonly used, and for motor provides the Ac with constant frequency and constant voltage, so motor can rotate with a constant speed; And servo driver is to have the not alternating current source of fixed frequency and voltage according to the change oar information (comprising parameters such as position, speed, acceleration) that sends from master control system into AC motor provides, with needs such as the position of the output of satisfying the demand, speed, acceleration.In the normal change oar process of wind-power electricity generation, need constantly carry out the control such as just commentaries on classics, counter-rotating, acceleration, angular positioning of motor and adjust according to the wind speed of reality, thereby be the change oar requirement that to satisfy in its normal course of operation, thereby must increase exchanges the change oar of servo driver with the control blade by the threephase AC that electrical network provides.
But, it should be noted that electrical network can satisfy the feathering requirement of blade as three-phase alternating-current supply, promptly when the servo driver fault, three-phase alternating-current supply can be used for the position with blade feathering to 90 degree.
Therefore, preferably, servocontroller comprises: servo power supply 12, servo driver 13 and control switch subelement K1, positive and negative output terminal X22:+UG, the X22:-UG of wherein said servo power supply 12 is connected to positive and negative input end X23:+UG, the X23:-UG of described servo driver 13, and output terminal X24:L1, the X24:L2 of described servo driver 13, X24:L3 are connected to described AC induction motor 15.Preferably, the positive pole of standby DC electrical source 14 is connected to the anode of switching diode D1, and the negative pole of described standby DC electrical source 14 is connected to the negative input end X23:-UG of described servo driver 13, and the negative electrode of described switching diode D1 is connected to the positive output end X22:+UG of described servo power supply 12; The signal output part X6:DO1 of described servo driver 13 is connected to described control switch subelement K1; And described AC induction motor 15 is connected to described three-phase alternating-current supply 11 by described control switch subelement K1.Therefore, by above-mentioned device and annexation thereof, the variable pitch control unit of wind-driven generator that can realize adopting AC induction motor is to the normal operation of feathering.
Furthermore, preferably, to the output voltage values V of DC electrical source 14
DSet, for example with V
DSet 312V, make output voltage values V when it is lower than the three-phase alternating-current supply normal power supply
A, the V of voltage is incorporated into the power networks in the C China
ABe generally 360V.When three-phase alternating-current supply 11 normal power supplies, the output voltage of servo power supply 12 output terminal X22:+UG, X22:-UG (for example being 360V) is higher than the output voltage (for example being 312V) of standby DC electrical source 14, switching diode D1 is in cut-off state, and be AC induction motor 15 power supplies by three-phase alternating-current supply 11 this moment; When three-phase alternating-current supply 11 power down, the output voltage of servo power supply 12 output terminals (for example being 0V) is lower than the output voltage (for example being 312V) of standby DC electrical source 14, described switching diode D1 is in the forward conduction state, and be AC induction motor 15 power supplies by standby DC electrical source 14 this moment.Be provided with switching diode between the standby DC electrical source servocontroller corresponding with it; protect standby DC electrical source with this; guarantee its unidirectional power supply, and when the three-phase alternating-current supply power down, switching diode can guarantee that standby DC electrical source inserts servocontroller automatically.Therefore, by above-mentioned device and annexation thereof, in the time that electric network power-fail can being implemented in, guarantee that AC induction motor continues to finish the feathering operation.
Preferably, servo driver 13 comprises that programmable controller (PLC) is to send the change oar information (comprising parameters such as position, speed, acceleration) from the master control system.Furthermore, when servo driver 13 normally moves, when control switch subelement K1 sent trouble signal, described control switch subelement K1 was not in off state to its signal output part X6:DO1, and this moment, AC induction motor 15 was driven to carry out the feathering operation by servo driver 13; When servo driver 13 breaks down, when its signal output part X6:DO1 sent trouble signal to control switch K1, described control switch K1 subelement was in closed state, and this moment, AC induction motor 15 was driven to carry out the feathering operation by three-phase alternating-current supply 11.Driving relationship between the servocontroller AC induction motor corresponding with it is controlled by control switch K1 subelement, and when servo driver breaks down, control switch K1 subelement can be realized the power supply that automaticallyes switch, and does not cut off the power supply to guarantee AC induction motor.Therefore, when servo driver 13 broke down, then its signal output part X6:DO1 output rated voltage was control switch subelement K1 power supply; Next, after control switch subelement K1 conducting, then by driving first AC induction motor 4 by three-phase alternating-current supply 11 to carry out the feathering operation.Therefore,, can realize when servo driver breaks down, can guarantee that also AC induction motor continues to finish the feathering operation by above-mentioned device and annexation thereof.
Furthermore, described three-phase alternating current source comprises the electric wire that sends from the cabin.Servo power supply 12 also comprises two other port except three input end X21:L1, X21:L2, X21:L3, one is the center line access interface, and another is the ground wire access interface.Simultaneously, the input end of servo driver 13 and output terminal respectively also have a grounding ports respectively.
Next, structure and the operating process to the control switch subelement is elaborated.
Fig. 2 is a structured flowchart, and the control switch subelement in the variable pitch control unit in accordance with a preferred embodiment of the present invention is shown.
Preferably, control switch subelement K1 comprises: the first control switch KA and the second control switch KB.Preferably, described first control switch KA and the described second control switch KB are relay switches.Preferably, described relay switch can comprise coil and contact.Preferably, described voltage rating is 24V.
As shown in Figure 2, when servo driver 13 normal operations, the signal output part X6:DO1 of servo driver 13 (for example is output as high level, 24VDC+, 24VDC-), and the contact of the first relay switch KA is a normally-closed contact, and the contact of the second relay switch KB is a normally opened contact, this moment the first relay switch KA coil electricity, its contact disconnects; Because the contact of the first relay switch KA disconnects, therefore not energising and its contact is in off state of the coil of the second relay switch KB, provide driving power by servo driver 13 for AC induction motor 15 this moment.
When servo driver 13 breaks down, signal output part X6:DO1 output low level, this moment, the coil of the first relay switch KA was not switched on, and its contact does not have action thereby still is in closed state; Because the make contact of the first relay switch KA, the therefore coil electricity of the second relay switch KB and its contact is in closed state, provide driving power by three-phase alternating-current supply for AC induction motor 15 this moment.
The effect of the second relay switch KB is: (for example guarantee voltage rating, 24V) can finish feathering during power down, be servo driver 13 faults, this moment, the voltage rating power supply was also broken down, the then coil power down of the first relay switch KA, the contact of the first relay switch KA is long closed contact, and this moment is closed, and then motor connection electrical network can be finished feathering by electrical network.Preferably, the signal output part X6:DO1 of servo driver 13 is powered separately by external power supply.
In Fig. 2, the just profound electrical signal of the interchange that 230L represents, preferably, the just profound electrical signal of described interchange is 230V, 50Hz; 400VL1,400VL2,400VL3 represent three-phase alternating-current supply, and preferably, the line voltage of described three-phase alternating-current supply is 400V, 50Hz.
When the servo driver fault, signal output part X6:DO1 output voltage is a low level; And when the servo driver fault was normally moved, signal output part X6:DO1 exported high level, and this is determined by self function of servo driver.
More than be to the structure of the variable pitch control unit of the wind-driven generator of the employing AC induction motor of a preferred embodiment of the invention and the detailed description of operating process, next will further describe the structure and the operating process of the variable blade control system that constitutes by above-mentioned variable pitch control unit.
Fig. 3 is a system block diagram, and the change oar control gear of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown, and wherein this system comprises three described variable pitch control units.Described three cover variable pitch control units further comprise: first variable pitch control unit 21, second variable pitch control unit 22 and the 3rd variable pitch control unit 23, wherein first variable pitch control unit 21 comprises first servocontroller 1, first AC induction motor 4, the first standby DC electrical source 7, the first control switch subelement K11 and the first switching diode D1, second variable pitch control unit 22 comprises second servocontroller 2, second AC induction motor 5, the second standby DC electrical source 8, the second control switch subelement K12 and second switch diode D2, and the 3rd variable pitch control unit 23 comprises the 3rd servocontroller 3, the 3rd AC induction motor 6, the 3rd standby DC electrical source 9, the 3rd control switch subelement K13 and the 3rd switching diode D3; Described first servocontroller 1, described second servocontroller 2 and described the 3rd servocontroller 3 are connected to same three-phase alternating-current supply respectively; And described first AC induction motor 4, described second AC induction motor 5 and described the 3rd AC induction motor 6 are connected to same described three-phase alternating-current supply by the described first control switch subelement K11, the described second control switch subelement K12 and described the 3rd control switch subelement K13 respectively.
Further, Fig. 4 is a system architecture diagram, the change oar control gear of the wind-driven generator of employing AC induction motor in accordance with a preferred embodiment of the present invention is shown, and three described variable pitch control units in this system are connected to three-phase alternating-current supply respectively, and are connected to principal controller.
Particularly, output terminal U, the V of three-phase alternating-current supply 11, W are connected to input end X21:L1, X21:L2, the X21:L3 of first servo power supply 21, second servo power supply 22 and the 3rd servo power supply 23 respectively.Described first servo power supply 21 comprises first servo power supply 211 and first servo driver 212, and wherein said first servo driver 212 has first interface end and second interface end.Described second servo power supply 22 comprises second servo power supply 221 and second servo driver 222, and wherein said second servo driver 222 has first interface end and second interface end.Described the 3rd servo power supply 23 comprises the 3rd servo power supply 231 and the 3rd servo driver 232, and wherein said second servo driver 232 has first interface end and second interface end.
Preferably, described variable blade control system also comprises: principal controller, wherein: first interface end of described first servo driver 212 is connected to described principal controller, be responsible for receiving master information, and the information of first servo power supply 21, second servo power supply 22 and the 3rd servo power supply 23 is passed to principal controller; Second interface end of described first servo driver 212 is connected to first interface end of described second servo driver 222; Second interface end of described second servo driver 222 is connected to first interface end of described the 3rd servo driver 232; And second interface end of second interface end of described first servo driver 212 and described the 3rd servo driver 232 all is connected a terminal resistance simultaneously.Preferably, each interface end can be CAN (controller local area network (Controller Area Network)) interface, but is not limited thereto.
Further, each interface end of servo driver 21-23 comprises: two row pins, wherein every row pin comprises CH pin (CAN-HIGH Pin), CL pin (CAN-LOW Pin), CG pin (Reference potential Pin), be respectively two of CH pin, CL pin, CG pins, and divide arranged on both sides.CH pin and the CL pin two ends that are connected to terminal resistance among one row of first servo driver 212, CH pin, CL pin, the CG pin among its another row are connected to CH pin, CL pin, the CG pin among the row of second servo driver 222; CH pin, CL pin, CG pin among another row of second servo driver 222 is connected to CH pin, CL pin, the CG pin among the row of the 3rd servo driver 232, CH pin, two ends that the CL pin is connected to described terminal resistance among its another row and the CG pin is unsettled does not connect.Described terminal resistance is used to guarantee that communication robust is not disturbed, eliminates the signal reflex in telecommunication cable.Preferably, described terminal resistance is 120 Europe.
As shown in Figure 4, when first servo driver 212 in running is made mistakes, its signal output part X6:DO1 exports a voltage rating to the first control switch subelement K11, so that described control switch subelement K11 closure then drives first AC induction motor 4 to carry out the feathering operation by three-phase alternating-current supply 11 this moment.Simultaneously, error message is sent to principal controller from first interface end of described first servo driver 212; Then, this error message is after principal controller is handled, and described principal controller is sent to first servo driver 212 by this first interface end with control information again; Then, described first servo driver 212 is sent to described second servo driver 222 and described the 3rd servo driver 232 by second interface end of described first servo driver 212 with this control information again; At last, after described second servo driver 222 and described the 3rd servo driver 232 receive this control information, with the top speed feathering.Therefore, by the feedback of principal controller, can accelerate the feathering operation of AC induction motor and guarantee that each unit finishes feathering error signal.
Next, a plurality of control switch annexations that become in the oar control gear are elaborated.
Fig. 5 is a structured flowchart, and a plurality of control switch annexations in the change oar control gear in accordance with a preferred embodiment of the present invention are shown.
As shown in Figure 5, the breakdown switch of the first control switch subelement K1, the second control switch subelement K2, the 3rd control switch subelement K3 is connected on the theft-resistant link chain with the bus communication breakdown switch.If the cabin theft-resistant link chain do not have fault, KK2 closure then, (for example, 24V) breakdown switch by bus failure switch, servo driver 212,222,232 is the KK1 power supply to voltage rating.If above-mentioned four breakdown switches, be bus failure switch 51, servo 3 breakdown switches 52, servo 2 breakdown switches 53 and servo 1 breakdown switch 54, all there is not fault, KK1 closure then, wheel hub does not have the signal feed back of fault (pitch-controlled system is contained in the wheel hub) to give the cabin master control system its inside; If any switch has fault in four breakdown switches, then KK1 disconnects, and notice master control pitch-controlled system breaks down and wants feathering; If when becoming the oar startup, then stop to start, and carry out feathering at once.After master control system is received theft-resistant link chain fault message or servo-drive fault, by sending first interface end of information such as 3 blade feather position (orientation angle is 90 °), feathering speed, feathering acceleration by first servo driver 212 to pitch-controlled system, first servo driver 212 sends feathering information to second servo driver 222 and described the 3rd servo driver 232 by the CAN bus then.
Generally, a wind-powered electricity generation machine contains three blades.When electric network power-fail, a servo driver fault, two other servo driver can normally use, and guarantees that two other blade can feathering, then can guarantee the safety of blower fan, and runaway accident does not take place.If in the time of electric network power-fail, two or all the probability of servo driver simultaneous faultss is very low is almost 0, so change oar control gear of the wind-driven generator of employing AC induction motor provided by the invention, the technical problem that exists in the prior art that can solve above to be mentioned, realizing under the situation of electric network power-fail, is that the AC induction motor power supply guarantees finishing of feathering by standby DC electrical source by servo driver; Under the situation that servo driver breaks down, the AC motor of servo unit connection therewith is directly connected to electrical network to carry out feathering, other servo units carry out feathering with top speed control blade simultaneously, thereby can solving AC induction motor, variable blade control system of the present invention when servo driver fault, electric network power-fail, can not be directly connected to the problem that standby DC electrical source is carried out feathering, this scheme is guaranteed the safe feathering of blower fan, prevents the generation of accidents such as driving.
In addition, because it is simple that AC induction motor has manufacturing process, cost is low, non-maintaining characteristics, in pitch-controlled system, use AC motor not only can save cost, also safeguard characteristics such as simple to operation according to having, therefore the change oar control gear of the wind-driven generator of employing AC induction motor provided by the invention has advantages such as reliability height, design complexities and manufacture cost are all lower, thereby can improve the competitiveness of product in market.
Though; the present invention is clearly demonstrated by above embodiment and accompanying drawing thereof; yet under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field should make various corresponding changes according to the present invention, but these corresponding changes all should belong to the protection domain of claim of the present invention.
Claims (10)
1. variable pitch control unit that adopts the wind-driven generator of AC induction motor, comprise: three-phase alternating-current supply (11), servocontroller (16), standby DC electrical source (14) and AC induction motor (15), the output terminal of described three-phase alternating-current supply (11) (U, V, W) are connected to the input end (X21:L1, X21:L2, X21:L3) of described servo power supply (12);
It is characterized in that:
Described servocontroller comprises: servo power supply (12), servo driver (13) and control switch subelement (K1), the positive and negative output terminal of wherein said servo power supply (12) (X22:+UG, X22:-UG) is connected to the positive and negative input end (X23:+UG, X23:-UG) of described servo driver (13), and the output terminal of described servo driver (13) (X24:L1, X24:L2, X24:L3) is connected to described AC induction motor (15);
The positive pole of described standby DC electrical source (14) is connected to the anode of switching diode (D1), and the negative pole of described standby DC electrical source (14) is connected to the negative input end (X23:-UG) of described servo driver (13), and the negative electrode of described switching diode (D1) is connected to the positive output end (X22:+UG) of described servo power supply (12);
The signal output part (X6:DO1) of described servo driver (13) is connected to described control switch subelement (K1); And
Described AC induction motor (15) is connected to described three-phase alternating-current supply (11) by described control switch subelement (K1).
2. variable pitch control unit according to claim 1 is characterized in that: described servo driver (13) comprises programmable controller.
3. variable pitch control unit according to claim 1 is characterized in that: described control switch subelement (K1) comprising: first control switch (KA) and second control switch (KB).
4. variable pitch control unit according to claim 3 is characterized in that: described first control switch (KA) and described second control switch (KB) are relay switches.
5. variable pitch control unit according to claim 4 is characterized in that: described relay switch comprises coil and contact.
6. a change oar control gear that adopts the wind-driven generator of AC induction motor is characterized in that: comprising: two covers variable pitch control unit according to claim 1 at least.
7. change oar control gear according to claim 6, it is characterized in that: comprising: the described variable pitch control unit of three covers, described three cover variable pitch control units are respectively first variable pitch control unit (21), second variable pitch control unit (22) and the 3rd variable pitch control unit (23)
Wherein: first variable pitch control unit (21) comprises first servocontroller (1), first AC induction motor (4), the first standby DC electrical source (7), the first control switch subelement (K11) and first switching diode (D1),
Second variable pitch control unit (22) comprises second servocontroller (2), second AC induction motor (5), the second standby DC electrical source (8), the second control switch subelement (K12) and second switch diode (D2), and
The 3rd variable pitch control unit (23) comprises the 3rd servocontroller (3), the 3rd AC induction motor (6), the 3rd standby DC electrical source (9), the 3rd control switch subelement (K13) and the 3rd switching diode (D3);
Described first servocontroller (1), described second servocontroller (2) and described the 3rd servocontroller (3) are connected to same three-phase alternating-current supply respectively; And
Described first AC induction motor (4), described second AC induction motor (5) and described the 3rd AC induction motor (6) are connected to same described three-phase alternating-current supply by the described first control switch subelement (K11), the described second control switch subelement (K12) and described the 3rd control switch subelement (K13) respectively.
8. change oar control gear according to claim 7 is characterized in that:
The output terminal of described three-phase alternating-current supply (U, V, W) is connected to the input end (X21:L1, X21:L2, X21:L3) of first servo power supply (21), second servo power supply (22) and the 3rd servo power supply (23) respectively,
Described first servo power supply (21) comprises first servo power supply (211) and first servo driver (212), and wherein said first servo driver (212) has first interface end and second interface end,
Described second servo power supply (22) comprises second servo power supply (221) and second servo driver (222), and wherein said second servo driver (222) has first interface end and second interface end,
Described the 3rd servo power supply (23) comprises the 3rd servo power supply (231) and the 3rd servo driver (232), and wherein said the 3rd servo driver (232) has first interface end and second interface end;
Described change oar control gear also comprises: principal controller, wherein: first interface end of described first servo driver (212) is connected to described principal controller, second interface end of described first servo driver (212) is connected to first interface end of described second servo driver (222), second interface end of described second servo driver (222) is connected to first interface end of described the 3rd servo driver (232), and second interface end of second interface end of described first servo driver (212) and described the 3rd servo driver (232) is connected a terminal resistance simultaneously.
9. change oar control gear according to claim 8 is characterized in that: first interface end and second interface end of first interface end of second interface end of described first servo driver (212), described second servo driver (222) and second interface end, described the 3rd servo driver (232) all are the CAN interface end.
10. a wind-driven generator is characterized in that, comprises according to the described change oar of each claim control gear among the claim 7-9.
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| CN102518554A (en) * | 2012-01-11 | 2012-06-27 | 重庆华渝电气仪表总厂 | Variable-pitch control system for wind generating set |
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| CN106224175A (en) * | 2016-09-30 | 2016-12-14 | 山东森源新能技术有限公司 | The feathering of a kind of pitch-variable system drives motion detection device and feathering method thereof |
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| CN104047803A (en) * | 2014-06-20 | 2014-09-17 | 北京普华亿能风电技术有限公司 | Electric feathering control method and system |
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| CN106224175A (en) * | 2016-09-30 | 2016-12-14 | 山东森源新能技术有限公司 | The feathering of a kind of pitch-variable system drives motion detection device and feathering method thereof |
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