CN104047803B - A kind of electronic feathering controlling method - Google Patents
A kind of electronic feathering controlling method Download PDFInfo
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- CN104047803B CN104047803B CN201410281801.XA CN201410281801A CN104047803B CN 104047803 B CN104047803 B CN 104047803B CN 201410281801 A CN201410281801 A CN 201410281801A CN 104047803 B CN104047803 B CN 104047803B
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- feathering
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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
Abstract
The invention provides a kind of electronic feathering controlling method; when wind power generating set occurs that theft-resistant link chain fault needs to start emergency stopping procedures; the AC driven power provided in wheel hub is not provided; first system utilizes DC power supply; drive DC circuit feathering; if the failure of direct current feathering; then connect alternating circuit; feathering is driven by ac power supply; if exchange feathering also failure, will DC electrical source be connected, drive feathering by DC electrical source; perform thus by DC electrical source and ac power supply driving feathering for subsequent use each other, until feathering success always.By performing DC electrical source and ac power supply electronic feathering controlling method for subsequent use each other; as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
Description
Technical field
The invention belongs to technical field of wind power generating equipment, particularly a kind of feathering control system of electric variable propeller system.
Background technique
Theft-resistant link chain is last pipe protection of blower fan, and anxious to be stopped by wheel hub, column foot suddenly stops, cabin is suddenly stopped, shock detection, mainshaft overdrive, driftage limit switch contact and form, when these parts be chained together have one to go wrong, whole series winding loop all can disconnect.Once fan safe chain disconnects, blower fan will report emergency shutdown, now just realizes quick feathering by power source driving blade, utilizes the aerodynamic characteristics of blade to realize aerodynamic brake, makes draught fan impeller stall, realize dead halt.
In order to increase the protection to blower fan, can dead halt when feathering system generally all will join reserve battery to guarantee unit generation catastrophe failure or major accident.
And direct current generator is with its stepless speed regulation, low-speed performance is good, and structure is simple, control accuracy is high, and response is fast, is thus widely used in wind turbine pitch system.Especially series DC machine starting torque is large, very good for the blade rotating the Shuo Dun ﹑ diameter tens of meters that weighs.
But the shortcoming of this mode to rely on battery operated, once cell damage or other reason cause battery to discharge, blower fan just cannot normal feathering, add non-cannot the shutdown in emergency situation of blower fan and cause the risk of " driving ".
Summary of the invention
Because the defect in prior art, the invention provides blower fan after generation theft-resistant link chain fault, when starting emergency feathering system, namely time triggering secure chain EFC signal (EmergencyFeatheringControl), in feathering circuit, first drive feathering with direct current supply, then drive the mode of feathering as standby power supply by ac power supply.
Theft-resistant link chain EFC signal is: the emergency feathering control signal triggered during theft-resistant link chain fault, being thered is provided by slip ring wheel hub by cabin, is the charged normally closed loop design of 24V voltage, when there is not theft-resistant link chain fault, this circuit closed, namely theft-resistant link chain EFC signal exports 24V high level; When there is theft-resistant link chain fault, this loop disconnects, and also, theft-resistant link chain EFC signal exports 0V low level, now performs feathering action.
A kind of electronic feathering controlling method, by DC power supply direct current feathering circuit with exchange feathering circuit by ac power supply, after theft-resistant link chain fault being detected, trigger EFC signal, emergency feathering control relay K1 disconnects, be not cut to the AC driven power provided in wheel hub simultaneously, first system utilizes DC power supply, drive DC circuit feathering, after time delay a period of time, whether successfully detect feathering, if this DC electrical source drives feathering failure, alternating circuit is connected, feathering is driven by ac power supply, after time delay a period of time, whether successfully detect feathering, if this ac power supply drives feathering also failure, again connect DC electrical source, feathering is driven by DC electrical source, perform by DC electrical source and ac power supply electronic feathering controlling method for subsequent use each other thus always, until feathering success.
The present invention compared with prior art, in original direct current feathering circuit, increase exchanges power supply with the alternating circuit driving feathering, this interchange feathering circuit provides power supply by wheel hub slip ring by cabin in wheel hub, after theft-resistant link chain fault being detected, this ac power supply enters axle control cabinet and exports DC electrical source through frequency variator frequency conversion, the direct current generator of feathering system is linked, to realize the electronic feathering of blower fan with original direct current feathering circuit.By performing DC electrical source and ac power supply electronic feathering controlling method for subsequent use each other; as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
The present invention also provides a kind of electronic feathering control system, comprise DC electrical source, direct current feathering control switch KM5, AC driven power, frequency variator, exchange feathering control switch KM3, direct current generator and emergency feathering control relay K1, wherein, after DC electrical source and direct current feathering control switch KM5 contact with by AC driven power and frequency variator and exchange feathering control switch KM3 contact after circuit and connect, then direct current generator is connected to, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is interlocking design, the break-make exchanging feathering control switch KM3 and direct current feathering control switch KM5 is controlled respectively by emergency feathering control relay K1.
System also comprises main limit switch S1, and be blade 91 degree of limit switches, blade position reaches 91 degree, is triggered, and namely S1 disconnects, and needs a redundancy limit switch S2 in addition, when blade position reaches 95 degree, is triggered, and namely S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor when that is 91 degree of limit switches lost efficacy at main limit switch.
When limit switch S1, limit switch S2 close, also when namely feathering is unsuccessful, by constantly controlling the break-make of emergency feathering control relay K1, control being switched on or switched off of DC electrical source or AC driven power, reach and drive feathering according to first performing DC electrical source, perform the order that ac power supply drives feathering again, drive feathering, until feathering success.
The present invention compared with prior art; by DC electrical source and ac power supply driving feathering controlling method for subsequent use each other; as long as guarantee direct current, exchange feathering circuit and have a road normal; then can complete blower fan emergency feathering smoothly; improve the Security of Wind turbines; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
Emergency feathering control relay K1 is 24V control relay, is controlled by two path control signal:
(1) by theft-resistant link chain EFC SC sigmal control, when there is not theft-resistant link chain fault, EFC is high level, the conducting of emergency feathering control relay; When there is theft-resistant link chain fault, trigger EFC signal (0V low level), then emergency feathering control relay disconnects;
(2) by interchange emergency feathering SC sigmal control, this signal is provided by master control, by exchanging emergency feathering control switch K2 given emergency feathering control relay K1.When generation theft-resistant link chain fault, and during the failure of direct current feathering, master control provides " exchanging emergency feathering signal "=1, now interchange emergency feathering control switch K2 conducting, then emergency feathering control relay K1 conducting (for 24V high level), performs and exchanges emergency feathering; When interchange feathering also failure, master control provides " exchanging emergency feathering signal "=0, now interchange emergency feathering control switch K2 disconnection, then emergency feathering control relay K1 disconnection (for 0V low level), performs direct-current emergency feathering.
Preferably, can increase and drive feathering and ac power supply to drive the number of times of feathering to limit to DC electrical source, such as counter can be set in the master control system being positioned at master control cabinet, each execution ac power supply or DC electrical source drive during feathering can add 1 to counter, when execution is after predetermined number of times, if feathering is also unsuccessful, then stop feathering action, also can increase and drive feathering and ac power supply to drive limiting cumulative time of feathering to DC electrical source, such as time delay relay can be increased, due to system perform drive the method for feathering by DC electrical source and perform drive the method for feathering by AC driven power time, generally all perform a set time (such as: 15 seconds), so here we can arrange when system performs after 3 direct current featherings exchange feathering with 4 times, namely its cumulative time performed is " (3+4) * 15 seconds=105 seconds ", if the time that feathering system performs reaches limiting time (such as 150 seconds), and feathering is also unsuccessful, then stop feathering action.Master control cabinet gives and becomes propeller angle and speed.
Electronic feathering system, when judging that whether feathering is successful, needs to judge: whether feathering is to 91 degree of restraining position for blade.Need a redundancy limit switch in addition, spacing for 95 degree, the safety brake of pitch motor can be guaranteed when that is 91 degree of limit switches lost efficacy at main limit switch.
Preferably, a dc circuit breaker can be provided in DC circuit, be direct current main power switch, overcurrent protection is provided; A circuit breaker can also be provided in alternating circuit, be ac main power switch, overcurrent protection is provided.
AC driven power is 400V (L1-3, N); Ac control power supply is 230V, and provided by wheel hub slip ring 400V power supply, ups power (6) is 230V Ac, powers through wheel hub slip ring with power source in wheel hub.
DC electrical source in system can be provided by battery pack, and 230V ac control power supply can charge for battery.
Accompanying drawing explanation
Below in conjunction with accompanying drawing to alternating direct-current of the present invention each other controlling method for subsequent use be specifically described.
Fig. 1 is that the present invention controls electronic feathering system flow chart by master control system;
Fig. 2 is circuit diagram of the present invention, is controlled the circuit diagram of electronic feathering system by master control system;
Fig. 3 is circuit diagram of the present invention, controls electronic feathering system circuit diagram by three time delay relays;
Fig. 4 is circuit diagram of the present invention, controls electronic feathering system circuit diagram by two time delay relays;
Fig. 5 is that the present invention controls electronic feathering system flow chart by three time delay relays;
Fig. 6 is that the present invention controls electronic feathering system flow chart by two time delay relays.
Embodiment
The electronic feathering controlling method of one provided by the invention and system, being only applicable to fault type is theft-resistant link chain fault.
Theft-resistant link chain EFC signal is: the emergency feathering control signal triggered during theft-resistant link chain fault, by the charged normally closed loop design of slip ring wheel hub 24V voltage, when there is not theft-resistant link chain fault, and this circuit closed, namely theft-resistant link chain EFC signal exports 24V high level; When there is theft-resistant link chain fault, this loop disconnects, and also, theft-resistant link chain EFC signal exports 0V low level, now performs feathering action.
Embodiment one: the break-make being controlled DC electrical source and ac power supply by the port output signal of master control cabinet, performs according to this by DC electrical source and ac power supply feathering method for subsequent use each other.
As Fig. 1 system flow chart, and Fig. 2 controls shown in the circuit diagram of electronic feathering system by master control system:
A kind of electronic feathering controlling method, when theft-resistant link chain fault, trigger EFC signal, namely EFC signal becomes low level, and emergency feathering control relay K1 disconnects, and performs following steps:
The first step, because emergency feathering control relay K1 disconnects, causes AC driven power disconnection, DC electrical source conducting, and now system performs by described DC electrical source is the method for direct current generator for electric drive feathering.
Second step, whether systems axiol-ogy feathering is successful: after emergency feathering control relay K1 disconnects, time delay 15 seconds, monitors 91 degree of limit switches or whether 95 degree of limit switches are triggered, if "Yes", feathering success, native system performs end.If the failure of "no" feathering, performs next step.
3rd step, after DC electrical source drives feathering failure, perform ac power supply feathering method: master control provides " exchanging emergency feathering signal "=1, namely export 24V high level, connect and exchange emergency feathering control switch K2, then, emergency feathering control relay K1 conducting, causes DC electrical source disconnection, AC driven power connection, and by the given feathering angle of master control (91 degree), it is that direct current generator is powered by frequency variator that system performs by described AC driven power, drives the method for feathering.
4th step, whether systems axiol-ogy feathering is successful: when after emergency feathering control relay K1 conducting, time delay 15 seconds, monitor 91 degree of limit switches or whether 95 degree of limit switches are triggered, if "Yes", feathering success, at this moment master control provides " exchange emergency feathering signal "=and 0, native system performs end; If the failure of "no" feathering, performs next step.
5th step, after ac power supply drives feathering failure, master control provides " exchange emergency feathering signal "=and 0, namely 0V low level is exported, now disconnect and exchange emergency feathering control switch K2, disconnect emergency feathering control relay K1, continue to perform first step DC electrical source and drive feathering.
Thus, can realize by DC electrical source and ac power supply driving feathering method for subsequent use each other, log off when feathering success.
When performing electronic feathering controlling method, performing direct drive feathering successively and being no more than 4 times with the number of times exchanging the repetition driving feathering.
By performing DC electrical source and ac power supply electronic feathering controlling method for subsequent use each other; as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
As Fig. 2 to be controlled shown in the circuit diagram of electronic feathering system by master control system, the invention provides a kind of electronic feathering control system, comprise DC electrical source 3, direct current feathering control switch KM5, AC driven power 4, frequency variator 7, exchange feathering control switch KM3, direct current generator 8 and emergency feathering control relay K1, after DC electrical source 3 and direct current feathering control switch KM5 contact with AC driven power 4 and frequency variator 7 and exchange feathering control switch KM3 contact after circuit and connect, then, be connected to direct current generator 8, wherein, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is interlocking design, controlled respectively by emergency feathering control relay K1.
System also comprises main limit switch S1, and be blade 91 degree of limit switches, blade position reaches 91 degree, is triggered, and namely S1 disconnects, and needs a redundancy limit switch S2 in addition, when blade position reaches 95 degree, is triggered, and namely S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor when that is 91 degree of limit switches lost efficacy at main limit switch.
System also comprises the control loop of interchange feathering control switch KM3 and the control loop of direct current feathering control switch KM5.The control loop exchanging feathering control switch KM3 adopts ac control power supply 5 to power; The control loop of direct current feathering control switch KM5 adopts ups power 6 to power.
Exchange the control loop of feathering control switch KM3: by emergency feathering control relay K1 normally opened contact, limit switch S1, limit switch S2 and direct current feathering control switch KM5 normally-closed contact and exchanges the coil series winding of feathering control switch KM3.
The control loop of direct current feathering control switch KM5: contacted by emergency feathering control relay K1 normally-closed contact, limit switch S1, limit switch S2 and the coil that exchanges the normally-closed contact of feathering control switch KM3 and direct current feathering control switch KM3.
System is also provided with master control cabinet 1, is provided with timer, counter and D01 port in this master control cabinet 1, and D01 port exports " exchanging emergency feathering signal "; Master control system is installed in master control cabinet 1, master control system realizes the function of timer sum counter, the value that control D01 port exports " exchanging emergency feathering signal ", and the angle of given blower variable-pitch and speed, wherein: timer is the time of implementation that AC driven power/DC electrical source drives feathering, the value of timer can be set to 12 seconds to 20 seconds, preferably 15 seconds; Drive the number of times of feathering for performing DC electrical source, its initial value is set to 0, and maximum value can be set to 2-4, is preferably set to 3.
When there is not theft-resistant link chain fault, emergency feathering control relay K1 is closed, direct current feathering control switch KM5 disconnects, exchange feathering control switch KM3 closes.
When there is theft-resistant link chain fault:
(1) first perform DC electrical source and drive feathering action.Now, emergency feathering control relay K1 disconnects, and timer is started working, and because emergency feathering control relay K1 normally opened contact disconnects, disconnects so exchange feathering control switch KM3 control loop; Now close because emergency feathering control relay K1 normally-closed contact is closed, limit switch does not trigger (closing), exchange the normally-closed contact of feathering control switch KM3 (disconnecting), therefore the control loop conducting of direct current feathering control switch KM5, now drive feathering by DC electrical source 3, when after the time reaching timer customization, if limit switch S1 or S2 is not triggered, then direct current feathering failure, continues to perform next step; If limit switch S1 or S2 is triggered, then direct current feathering success, the control loop of the control loop and direct current feathering control switch KM5 that exchange feathering control switch KM3 all disconnects, and native system performs end.
(2) if the failure of direct current feathering, perform ac power supply and drive feathering action
System judges whether the value of counter is 3, if the value of counter is 3, native system performs end, now, the D01 port of master control cabinet 1 provides " exchanging emergency feathering signal "=0, namely exports 0V low level, exchange emergency feathering control switch K2 to disconnect, emergency feathering control relay K1 disconnects;
Otherwise, counter+1, timer restarts work, the D01 port of master control cabinet 1 provides " exchanging emergency feathering signal "=1, exports 24V high level, connects and exchanges emergency feathering control switch K2, then, emergency feathering control relay K1 conducting, because the normally-closed contact of emergency feathering control relay K1 disconnects, so direct-current emergency feathering control switch KM5 control loop disconnects; Now because emergency feathering control relay K1 normally opened contact is closed, limit switch does not trigger (closing), the normally-closed contact of direct current feathering control switch KM5 (disconnecting) closes, therefore the control loop conducting of feathering control switch KM3 is exchanged, systematic evaluation continues to perform feathering to the feathering circuit driven by AC driven power 4, when after the time again reaching timer customization, if limit switch S1 or S2 is not triggered, then exchange feathering failure, continue to perform next step; If limit switch S1 or S2 is triggered, then exchange feathering success, the control loop of the control loop and direct current feathering control switch KM5 that exchange feathering control switch KM3 all disconnects, and native system performs end.
(3) if exchange feathering also failure, again perform DC electrical source and drive feathering action.The D01 port of master control cabinet 1 provides " exchanging emergency feathering signal "=0, namely exports 0V low level, and now exchange emergency feathering control switch K2 and disconnect, system continues to perform step (1).
Thus, when limit switch S1, limit switch S2 close, also when namely feathering is unsuccessful, the DO1 port of master control cabinet 1 constantly outputs signal the break-make controlling emergency feathering control relay K1, being switched on or switched off of DC electrical source or AC driven power is controlled to reach, drive DC electrical source and ac power supply for subsequent use each other, carry out the object of feathering according to this.
Can guarantee that at least one road feathering circuit is normal like this, blower fan feathering can be completed smoothly.
Preferably, also comprise and exchange 400V control switch, axle control cabinet 2 electric after, switch on power, exchange 400V power supply for frequency variator provides.
Preferably, also comprising AC circuit breaker Q1, is 400V power switch, and AC driven power 4, ac power switch Q1 are connected with interchange 400V control switch KM4.
Preferably, also comprising dc circuit breaker Q2, is DC power supply switch, and DC electrical source 3, direct current main power switch Q2 and DC electrical source feathering control switch KM5 contact.
Wherein, 400V main power switch Q1, interchange 400V control switch KM4, frequency variator 7, interchange feathering control switch KM3, direct current main power switch Q2 and direct current feathering control switch KM5 are positioned at axle control cabinet 2.
As Fig. 2 to be controlled by master control system shown in the circuit diagram of electronic feathering system, in figure, each device is:
Q1: AC circuit breaker, 400V ac power switch, provides overcurrent protection.
Q2: dc circuit breaker, battery power switch, provides overcurrent protection.
K1:24V control relay, emergency feathering control relay, is controlled by two path control signal:
1) be theft-resistant link chain EFC SC sigmal control, when there is theft-resistant link chain fault, trigger EFC signal (low level), then emergency feathering control relay K1 disconnects;
2) control for exchanging emergency feathering control switch K2, when generation theft-resistant link chain fault, and when direct current feathering is unsuccessful, master control provides " exchange emergency feathering signal "=and 1, export 24V high level, connect and exchange emergency feathering control switch K2, then emergency feathering control relay K1 conducting, system craspedodrome AC driven power drives feathering; When interchange feathering is also unsuccessful, " interchange emergency feathering signal "=0, output 0V low level that master control provides, disconnect and exchange emergency feathering control switch K2, then emergency feathering control relay K1 disconnects, system craspedodrome DC electrical source driving feathering.
K2: control relay, exchanges emergency feathering control switch, is controlled by master control system.The D01 port of master control cabinet 1 is connected with interchange emergency feathering control switch K2, exchange the normally opened contact of emergency feathering control switch K2 and described safety chain signal and connect afterwards and the coil of emergency feathering control relay K1 contact and form the control loop of described emergency feathering control relay K1.When the D01 port of master control cabinet 1 exports 24V high level, exchange emergency feathering control switch K2 and close, emergency feathering control relay K1 conducting then; When the D01 port of master control cabinet 1 exports 0V low level, exchange emergency feathering control switch K2 and disconnect, emergency feathering control relay K1 disconnects then.
KM3: contactor, exchanges feathering control switch, for direct current generator provides DC electrical source, obtain electric after, connect frequency variator direct current and export and direct current generator, simultaneously enable frequency variator, export DC electrical source, perform ac power supply and drive and become oar action.On condition: emergency feathering control relay K1 conducting (for high level), meanwhile, direct current feathering control switch KM5 is off state, simultaneously, blade 91 degree, 95 degree of position limit switch access failures, namely blade does not reach 91 degree, 95 degree positions, and S1, S2 are closed state.
The control switch of KM4: contactor, 400V ac power supply 4, axle control cabinet 2 electric after, powered by ac control power supply 5, for frequency variator provides 400V ac power supply.
KM5: contactor, direct current feathering control switch, for direct current generator provides DC electrical source, obtain electric after, DC electrical source is connected, and DC electrical source drives feathering action.On condition: theft-resistant link chain EFC signal is triggered, namely emergency feathering control relay K1 disconnects, and exchanges feathering circuit switch KM3 and disconnect, simultaneously, blade 91 degree, 95 degree of position limit switch access failures, namely blade does not reach 91 degree, 95 degree positions, and S1, S2 are closed state.
S1: be blade 91 degree of limit switches, blade position reaches 91 degree, is triggered, namely S1 disconnects.
S2: be blade 95 degree of limit switches, blade position reaches 95 degree, is triggered, namely S2 disconnects.The safety brake of pitch motor is guaranteed when limit switch S1 lost efficacy.
Preferably, AC driven power 4,400V, is powered by wheel hub slip ring.
Ac control power supply 5,230V, is provided by 400V AC driven power, provides control power supply for exchanging feathering control switch KM3.
Ups power 6,230V is powered to wheel hub through wheel hub slip ring by the UPS device being positioned at engine room control cabinet, for direct current feathering control switch KM5 provides control power supply.
DC electrical source 3 can be battery pack, is charged by 230V ac control power supply 5.
Embodiment two: the break-make being controlled DC electrical source and ac power supply by time delay relay, perform according to this by DC electrical source and ac power supply feathering method for subsequent use each other.
As Fig. 1 system flow chart and Fig. 3 control shown in electronic feathering system circuit diagram by three time delay relays:
A kind of electronic feathering controlling method, when theft-resistant link chain fault, trigger EFC signal, namely EFC signal becomes low level, and emergency feathering control relay K1 disconnects, and performs following steps:
The first step, because emergency feathering control relay K1 disconnects, causes AC driven power disconnection, DC electrical source conducting, and now system performs by described DC electrical source is the method for direct current generator for electric drive feathering.
Second step, whether systems axiol-ogy feathering is successful: after emergency feathering control relay K1 disconnects, and controls time delay 15 seconds by time delay relay, monitor 91 degree of limit switches or whether 95 degree of limit switches are triggered, if "Yes", feathering success, native system performs end.If the failure of "no" feathering, performs next step.
3rd step, after DC electrical source drives feathering failure, perform ac power supply feathering method: now by time delay relay, control to exchange emergency feathering control switch K2 conducting, then, emergency feathering control relay K1 conducting, cause DC electrical source disconnection, AC driven power connection, and by the given feathering angle of master control (91 degree), it is that direct current generator is powered by frequency variator that system performs by described AC driven power, drives the method for feathering.
4th step, whether systems axiol-ogy feathering is successful: when after emergency feathering control relay K1 conducting, controls time delay 15 seconds by time delay relay, monitor 91 degree of limit switches or whether 95 degree of limit switches are triggered, if "Yes", feathering success, native system performs end; If the failure of "no" feathering, performs next step.
5th step, after ac power supply drives feathering failure, by time delay relay, control to exchange emergency feathering control switch K2 and disconnect, emergency feathering control relay K1 disconnects, and continues to perform first step DC electrical source and drives feathering.
Thus, can realize by DC electrical source and ac power supply driving feathering method for subsequent use each other, log off when feathering success.
When performing electronic feathering controlling method of the present invention, perform direct drive feathering successively and be no more than 105 seconds with the time exchanging the repetition driving feathering, when also namely performing DC electrical source and ac power supply driving feathering method for subsequent use each other, DC electrical source drives feathering 3 times, and ac power supply drives feathering 4 times.Here time relay time delay performs the number of times of feathering and each time controling performing feathering by DC electrical source execution number of times and ac power supply, when the change of feathering number of times and (or) each feathering time change, and the time of graded time lag relay.
By DC electrical source and ac power supply driving feathering controlling method for subsequent use each other; as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
As Fig. 3 controls shown in electronic feathering system circuit diagram by three time delay relays, the invention provides a kind of electronic feathering control system, comprise DC electrical source 3, direct current feathering control switch KM5, AC driven power 4, frequency variator 7, exchange feathering control switch KM3, direct current generator 8 and emergency feathering control relay K1, after DC electrical source 3 and direct current feathering control switch KM5 contact with AC driven power 4 and frequency variator 7 and exchange feathering control switch KM3 contact after circuit and connect, then, be connected to direct current generator 8, wherein, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is interlocking design, controlled respectively by emergency feathering control relay K1.
System also comprises main limit switch S1, and be blade 91 degree of limit switches, blade position reaches 91 degree, is triggered, and namely S1 disconnects, and needs a redundancy limit switch S2 in addition, when blade position reaches 95 degree, is triggered, and namely S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor when that is 91 degree of limit switches lost efficacy at main limit switch.
System also comprises the control loop of interchange feathering control switch KM3 and the control loop of direct current feathering control switch KM5.The control loop exchanging feathering control switch KM3 adopts ac control power supply 5 to power; The control loop of direct current feathering control switch KM5 adopts ups power 6 to power.
Exchange the control loop of feathering control switch KM3: by emergency feathering control relay K1 normally opened contact, limit switch S1, limit switch S2 and direct current feathering control switch KM5 normally-closed contact and exchanges the coil series winding of feathering control switch KM3;
The control loop of direct current feathering control switch KM5: contacted by emergency feathering control relay K1 normally-closed contact, limit switch S1, limit switch S2 and the coil that exchanges the normally-closed contact of feathering control switch KM3 and direct current feathering control switch KM3.
The present invention also arranges time delay relay KT1, KT2 and KT3, and wherein KT1 controls the time that DC electrical source drives feathering; KT2 controls the time that ac power supply drives feathering; KT3 controls DC electrical source and the ac power supply cumulative time driving feathering successively for subsequent use each other.
Exchange emergency feathering control switch K2 control loop by:
The normally opened contact of time delay relay KT1 with exchange emergency feathering control switch K2 coil series connection circuit,
The normally opened contact of time delay relay KT1 and the series connection circuit of time delay relay KT2 coil,
The normally-closed contact of time delay relay KT2 and the series connection circuit of time delay relay KT1 coil,
Altogether three-circuit and connect composition and after the normally-closed contact of connection circuit and time delay relay KT3 contacts,
Connect with time delay relay KT3 coil again,
Finally contact with relay K 4 normally-closed contact again.
Wherein, relay K 4, is controlled by safety chain signal, and when there is theft-resistant link chain fault, EFC24V power loss, relay K 4 disconnects.
When there is not theft-resistant link chain fault, emergency feathering control relay K1 is closed, direct current feathering control switch KM5 disconnects, interchange feathering control switch KM3 is closed, relay K 4 is closed, exchange emergency feathering control switch K2 disconnects, and time delay relay KT1, KT2, KT3 do not work.
When there is theft-resistant link chain fault: relay K 4 disconnects, and makes time delay relay KT3 obtain electric.
(1) first perform DC electrical source and drive feathering action.Now emergency feathering control relay K1 disconnects, and now, time delay relay KT1, KT2, KT3 are in off state, and therefore, the normally opened contact of time delay relay KT1 disconnects, and the normally-closed contact of KT2 closes; Because the normally-closed contact of time delay relay KT2 closes, time delay relay KT1 is caused to obtain electric.
Because emergency feathering control relay K1 normally opened contact disconnects, disconnect so exchange feathering control switch KM3 control loop; Now close because emergency feathering control relay K1 normally-closed contact is closed, limit switch does not trigger (closing), exchange the normally-closed contact of feathering control switch KM3 (disconnecting), therefore the control loop conducting of direct current feathering control switch KM5, now drives feathering by DC electrical source 3.
Postpone a period of time (i.e. the delay time of time delay KT1) afterwards: if limit switch S1 or S2 is not triggered, then direct current feathering failure, continue to perform next step; If limit switch S1 or S2 is triggered, then direct current feathering success, the control loop of the control loop and direct current feathering control switch KM5 that exchange feathering control switch KM3 all disconnects, and native system performs end.
(2) if the failure of direct current feathering, perform ac power supply and drive feathering action, when after the delay time reaching time delay relay KT1, time delay relay KT1 conducting, time delay relay KT2, KT3 are in off state, now, the normally opened contact of time delay relay KT1 closes, and the normally-closed contact of time delay relay KT2 closes; Because the normally-closed contact of time delay relay KT2 closes, time delay relay KT1 is caused to continue electric; Because the normally opened contact of time delay relay KT1 closes, cause, exchange emergency feathering control switch K2 and connect, time delay relay KT2 obtains electric.
Connect owing to exchanging emergency feathering control switch K2, emergency feathering control relay K1 conducting, the normally-closed contact of emergency feathering control relay K1 disconnects, so direct-current emergency feathering control switch KM5 control loop disconnects; Now because emergency feathering control relay K1 normally opened contact is closed, limit switch does not trigger (closing), the normally-closed contact of direct current feathering control switch KM5 (disconnecting) closes, therefore the control loop conducting of feathering control switch KM3 is exchanged, systematic evaluation continues to perform feathering to the feathering circuit driven by AC driven power 4, postpone a period of time (i.e. the delay time of time delay relay KT2) afterwards: if limit switch S1 or S2 is not triggered, then exchange feathering failure, continue to perform next step; If limit switch S1 or S2 is triggered, then exchange feathering success, the control loop of the control loop and direct current feathering control switch KM5 that exchange feathering control switch KM3 all disconnects, and native system performs end.
(3) if exchange feathering failure, continue to perform DC electrical source and drive feathering action
When after the delay time reaching time delay relay KT2, time delay relay KT2 conducting, the normally-closed contact of time delay relay KT2 disconnects, then time delay relay KT1 disconnects, cause the normally opened contact of time delay relay KT1 to disconnect, make time delay relay KT2 and exchange emergency feathering control switch K2 and disconnect.Now, time delay relay KT1, KT2, KT3 is in off state.Due to, exchange emergency feathering control switch K2 and disconnect, system continues to perform step (1).
(4) total delay time arrives, and system is finished
After reaching the delay time of time delay relay KT3 retard time, time delay relay KT3 conducting, now the normally-closed contact of time delay relay KT3 disconnects, therefore, time delay relay KT1, KT2 and K2 disconnect simultaneously, exchange emergency feathering control switch K2 control loop to quit work, exchange emergency feathering control switch K2 and be in off state always, native system performs end.
Thus, when limit switch S1, limit switch S2 close, also when namely feathering is unsuccessful, by constantly controlling the break-make of emergency feathering control relay K1, control being switched on or switched off of DC electrical source or AC driven power, reach and drive feathering according to first performing DC electrical source, then perform the order that ac power supply drives feathering, drive feathering, until feathering success.
Therefore, as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines, reduce the frequency of usage of direct current feathering circuit simultaneously, protection battery.
Preferably, also comprise and exchange 400V control switch KM4, axle control cabinet 2 electric after, connect control switch KM4, exchange 400V power supply for frequency variator provides.
Preferably, also comprise AC circuit breaker Q1, AC driven power 4, AC circuit breaker Q1 are connected with interchange 400V control switch KM4.
Preferably, also comprising dc circuit breaker Q2, is DC power supply switch, and DC electrical source 3, direct current main power switch Q2 and DC electrical source feathering control switch KM5 contact.
Wherein, 400V main power switch Q1, interchange 400V control switch KM4, frequency variator 7, interchange feathering control switch KM3, direct current main power switch Q2 and direct current feathering control switch KM5 are positioned at axle control cabinet 2.
As Fig. 3 is controlled shown in electronic feathering system circuit diagram by three time delay relays, in figure, each device is (only listing the distinguishing electrical equipment with Fig. 2):
K1:24V control relay, emergency feathering control relay, is controlled by two path control signal:
3) be theft-resistant link chain EFC SC sigmal control, when there is theft-resistant link chain fault, EFC24V power loss, namely trigger EFC signal (low level), then emergency feathering control relay K1 disconnects;
4) controlled by interchange emergency feathering control switch K2, when generation theft-resistant link chain fault, and during the failure of direct current feathering, exchange emergency feathering control switch K2 conducting, control emergency feathering control relay K1 conducting (for 24V high level), perform and exchange emergency feathering; When interchange feathering also failure, exchange emergency feathering control switch K2 and disconnect, control emergency feathering control relay K1 disconnection (for 0V low level), perform direct-current emergency feathering.
K2: control relay, exchanges emergency feathering control switch.By relay K 4, and three time delay relay KT1, KT2 and KT3 actings in conjunction, control K2 conducting and disconnection.
K4: control relay, is controlled by safety chain signal, and when there is theft-resistant link chain fault, EFC24V power loss, relay K 4 disconnects.
KT1: obtain electric time lagged type time delay relay, be the time that DC electrical source drives feathering, the delay time of KT1 can be the random time between 12 seconds to 20 seconds, preferably 15 seconds.
KT2: obtain electric time lagged type time delay relay, be the time that ac power supply drives feathering, the delay time of KT2 can be the random time between 12 seconds to 20 seconds, preferably 15 seconds.
KT3: obtain electric time lagged type time delay relay, for total feathering time, the delay time of KT3 can be the random time between 94 seconds to 140 seconds, preferably 105 seconds, in the present invention the set of time of KT3 be KT3 time delay time=(time of KT1 time delay) × 4 times+(time of KT2 time delay) × 3 times, also drive number of times and its set of time needed separately of feathering according to ac/Dc power.
Embodiment three: the break-make being controlled DC electrical source and ac power supply by time delay relay, perform and first drive feathering to be driven the method for feathering again by ac power supply by DC electrical source.
Certainly, feathering system also only can perform the method for a DC electrical source driving feathering, if perform the method for an ac power supply driving feathering after feathering failure again.
As Fig. 1 system flow chart and Fig. 4 control shown in electronic feathering system circuit diagram by two time delay relays,
A kind of electronic feathering controlling method, when theft-resistant link chain fault, trigger EFC signal, namely EFC signal becomes low level, and emergency feathering control relay K1 disconnects, and performs following steps:
The first step, because emergency feathering control relay K1 disconnects, causes AC driven power disconnection, DC electrical source conducting, and now system performs by described DC electrical source is the method for direct current generator for electric drive feathering.
Second step, whether systems axiol-ogy feathering is successful: after emergency feathering control relay K1 disconnects, and controls time delay 15 seconds by time delay relay, monitor 91 degree of limit switches or whether 95 degree of limit switches are triggered, if "Yes", feathering success, native system performs end.If the failure of "no" feathering, performs next step.
3rd step, after DC electrical source drives feathering failure, perform ac power supply feathering method: now by time delay relay, control to exchange emergency feathering control switch K2 conducting, then, emergency feathering control relay K1 conducting, cause DC electrical source disconnection, AC driven power connection, and by the given feathering angle of master control (91 degree), it is that direct current generator is powered by frequency variator that system performs by described AC driven power, drives the method for feathering.
4th step, when time delay relay time delay is after 15 seconds, after AC driven power drives feathering to complete, now, if 91 degree of limit switches or 95 degree of limit switches are triggered, then ac power supply drives feathering to complete, and exchanges emergency feathering control switch K2 and disconnects, emergency feathering control relay K1 disconnects, and native system performs end; If 91 degree of limit switches or 95 degree of limit switches are not triggered, then ac power supply drives feathering failure, and exchange emergency feathering control switch K2 and disconnect, emergency feathering control relay K1 disconnects, and native system performs end.
By increasing exchanges, power supply drives feathering controlling method as standby power supply, as long as guarantee direct current, exchange feathering circuit and have a road normal, then can complete blower fan emergency feathering smoothly, improve the Security of Wind turbines.
As Fig. 4 controls shown in electronic feathering system circuit diagram by two time delay relays, the invention provides a kind of electronic feathering control system, comprise DC electrical source 3, direct current feathering control switch KM5, AC driven power 4, frequency variator 7, exchange feathering control switch KM3, direct current generator 8 and emergency feathering control relay K1, after DC electrical source 3 and direct current feathering control switch KM5 contact with AC driven power 4 and frequency variator 7 and exchange feathering control switch KM3 contact after circuit and connect, then, be connected to direct current generator 8, wherein, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is interlocking design, controlled respectively by emergency feathering control relay K1.
System also comprises main limit switch S1, and be blade 91 degree of limit switches, blade position reaches 91 degree, is triggered, and namely S1 disconnects, and needs a redundancy limit switch S2 in addition, when blade position reaches 95 degree, is triggered, and namely S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor when that is 91 degree of limit switches lost efficacy at main limit switch.
System also comprises the control loop of interchange feathering control switch KM3 and the control loop of direct current feathering control switch KM5.The control loop exchanging feathering control switch KM3 adopts ac control power supply 5 to power; The control loop of direct current feathering control switch KM5 adopts ups power 6 to power.
Exchange the control loop of feathering control switch KM3: by emergency feathering control relay K1 normally opened contact, limit switch S1, limit switch S2 and direct current feathering control switch KM5 normally-closed contact and exchanges the coil series winding of feathering control switch KM3;
The control loop of direct current feathering control switch KM5: contacted by emergency feathering control relay K1 normally-closed contact, limit switch S1, limit switch S2 and the coil that exchanges the normally-closed contact of feathering control switch KM3 and direct current feathering control switch KM3.
The present invention also arranges time delay relay KT1, KT2, and wherein, the ON time exchanging emergency feathering control switch K2 is the delay time of the delay time-time delay relay KT1 of time delay relay KT2; The time exchanging emergency feathering control switch K2 disconnection is the delay time of KT1, and KT2 delay time is greater than the delay time of KT1.
System also comprises control relay K4, is controlled by safety chain signal, and when there is theft-resistant link chain fault, EFC24V power loss, relay K 4 disconnects.
KT1/KT2 control loop: relay K 4 normally-closed contact and time delay relay KT1 and time delay relay KT2 in parallel after circuit contact;
Exchange emergency feathering control switch K2 control loop: the normally opened contact of time delay relay KT1, the normally-closed contact of time delay relay KT2 with exchanges emergency feathering control switch K2 coil and contacts.
When there is not theft-resistant link chain fault, emergency feathering control relay K1 is closed, relay K 4 is closed, exchange emergency feathering control switch K2 disconnects, direct current feathering control switch KM5 disconnects, exchange feathering control switch KM3 closes, and time delay relay KT1, time delay relay KT2 do not work.
When there is theft-resistant link chain fault: relay K 4 disconnects, and makes time delay relay KT1, KT2 obtain electric.
(1) first perform DC electrical source and drive feathering action, emergency feathering control relay K1 disconnects.Because the normally opened contact of time delay relay KT1 disconnects, disconnect so exchange emergency feathering control switch K2 control loop.
Due to, emergency feathering control relay K1 disconnects, and emergency feathering control relay K1 normally opened contact disconnects, and disconnects so exchange feathering control switch KM3 control loop; Now close because emergency feathering control relay K1 normally-closed contact is closed, limit switch does not trigger (closing), exchange the normally-closed contact of feathering control switch KM3 (disconnecting), therefore the control loop conducting of direct current feathering control switch KM5, now drives feathering by DC electrical source 3.
Postpone a period of time (i.e. the delay time of time delay KT1) afterwards: if limit switch S1 or S2 is not triggered, then direct current feathering failure, continue to perform next step; If limit switch S1 or S2 is triggered, then direct current feathering success, the control loop of the control loop and direct current feathering control switch KM5 that exchange feathering control switch KM3 all disconnects, and native system performs end.
(2) if the failure of direct current feathering, perform ac power supply and drive feathering action, when after the delay time reaching time delay relay KT1, time delay relay KT1 conducting, time delay relay KT2 disconnects, and now, the normally opened contact of time delay relay KT1 closes, the normally-closed contact of time delay relay KT2 closes, and exchanges emergency feathering control switch K2 and connects.
Connect owing to exchanging emergency feathering control switch K2, emergency feathering control relay K1 conducting, the normally-closed contact of emergency feathering control relay K1 disconnects, so direct-current emergency feathering control switch KM5 control loop disconnects; Now because emergency feathering control relay K1 normally opened contact is closed, limit switch does not trigger (closing), the normally-closed contact of direct current feathering control switch KM5 (disconnecting) closes, therefore exchange the control loop conducting of feathering control switch KM3, systematic evaluation continues to perform feathering to the feathering circuit driven by AC driven power 4.
(namely the delay time of time delay relay KT2 arrives to postpone a period of time, now the ON time of distance time delay relay KT1 is: the delay time of the delay time-KT1 of KT2) afterwards: if limit switch S1 or S2 is not triggered, then exchange feathering failure; If limit switch S1 or S2 is triggered, then exchange feathering success, native system performs end.
(3) exchange feathering to be finished, when after the delay time reaching time delay relay KT2, time delay relay KT2 conducting, therefore the normally-closed contact of time delay relay KT2 disconnects, cause exchanging emergency feathering control switch K2 to disconnect, emergency feathering control signal K1 disconnects, and native system performs end.
Preferably, also comprise and exchange 400V control switch, axle control cabinet 2 electric after, switch on power, exchange 400V power supply for frequency variator provides.
Preferably, also comprising AC circuit breaker Q1, is 400V power switch, and AC driven power 4, ac power switch Q1 are connected with interchange 400V control switch KM4.
Preferably, also comprising dc circuit breaker Q2, is DC power supply switch, and DC electrical source 3, direct current main power switch Q2 and DC electrical source feathering control switch KM5 contact.
Wherein, 400V main power switch Q1, interchange 400V control switch KM4, frequency variator 7, interchange feathering control switch KM3, direct current main power switch Q2 and direct current feathering control switch KM5 are positioned at axle control cabinet 2.
As Fig. 4 is controlled shown in electronic feathering system circuit diagram by two time delay relays, in figure, each device is (only listing the distinguishing electrical equipment with Fig. 2):
K1:24V control relay, emergency feathering control relay, is controlled by two path control signal:
1) be theft-resistant link chain EFC SC sigmal control, when there is theft-resistant link chain fault, EFC24V power loss, namely trigger EFC signal (low level), then emergency feathering control relay K1 disconnects;
2) controlled by interchange emergency feathering control switch K2, when generation theft-resistant link chain fault, and during the failure of direct current feathering, exchange emergency feathering control switch K2 conducting, control emergency feathering control relay K1 conducting (for 24V high level), perform and exchange emergency feathering; After ac power supply drives feathering to complete, exchange emergency feathering control switch K2 and disconnect, control emergency feathering control relay K1 and disconnect (for 0V low level), perform direct-current emergency feathering.
K2: control relay, exchanges emergency feathering control switch.By relay K 4, and two time delay relay KT1, KT2 actings in conjunction, control K2 conducting and disconnection, when theft-resistant link chain fault, it controls emergency feathering control relay K1.
K4: control relay, is controlled by safety chain signal, and when there is theft-resistant link chain fault, EFC24V power loss, relay K 4 disconnects.
KT1: obtain electric time lagged type time delay relay, controls the time exchanging emergency feathering control switch K2 disconnection.The time of time delay can be the random time between 12 seconds to 20 seconds, preferably 15 seconds.
KT2: obtain electric time lagged type time delay relay, control with KT1 mono-piece the ON time (delay time of the delay time-time delay relay KT1 of time delay relay KT2) exchanging emergency feathering control switch K2, the delay time of KT2 is greater than the delay time of KT1.The time of time delay can be the random time between 24 seconds to 40 seconds, preferably 30 seconds.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any technician being familiar with this patent is not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned prompting can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of the present invention program.
Claims (4)
1. an electronic feathering controlling method, performs following steps:
(1) after theft-resistant link chain fault being detected, theft-resistant link chain EFC signal output low level, emergency feathering control relay K1 disconnects;
(2) because emergency feathering control relay K1 disconnects, cause AC driven power disconnection, DC electrical source conducting, now system performs by described DC electrical source is the method for direct current generator for electric drive feathering;
(3) when executing after by the method for described DC power supply driving feathering, whether successfully feathering is detected: if feathering success, system performs end, if feathering failure, execution step (4);
(4) after described DC power supply drives the method failure of feathering, master control cabinet port provides " exchange emergency feathering signal "=and 1, control described emergency feathering control relay K1 conducting, cause the disconnection of described DC electrical source, the connection of described AC driven power, it is that direct current generator is powered by frequency variator that system performs by described AC driven power, drives the method for feathering;
(5) after executing the method for AC driven power for electric drive feathering, whether successfully detect feathering: if feathering success, system performs end, if feathering failure, system performs step (2) is driven feathering method by DC power supply again.
2. electronic feathering controlling method according to claim 1, is characterized in that, when blade pitch angle be 91 degree or 95 degree time, feathering success, otherwise feathering failure.
3. electronic feathering controlling method according to claim 1, is characterized in that, also comprising the interchange feathering control switch be turned on or off for controlling described AC driven power; With for controlling the direct current feathering control switch that described DC electrical source is turned on or off, described interchange feathering control switch and described direct current feathering control switch are interlocking designs, are controlled the break-make of described interchange feathering control switch and described direct current feathering control switch by described emergency feathering control relay K1 respectively.
4. electronic feathering controlling method according to claim 1, is characterized in that, alternately performs the number of times driving the method for feathering by DC power supply and repeated for the method for electric drive feathering by AC driven power and is no more than 4 times.
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| CN106224175B (en) * | 2016-09-30 | 2018-08-17 | 山东森源新能源装备制造有限公司 | A kind of the feathering driving detection device and its feathering method of pitch-variable system |
| CN111391664B (en) * | 2018-12-27 | 2022-04-15 | 比亚迪股份有限公司 | Rail vehicle, traction control system thereof, emergency driving method and device |
| CN111852768B (en) * | 2020-07-13 | 2024-02-27 | 青岛池华电气科技有限公司 | Autonomous emergency feathering control system and method for power grid side of pitch control system |
| CN113250903A (en) * | 2021-06-07 | 2021-08-13 | 天津瑞能电气有限公司 | Emergency yaw control device and control method for wind generating set |
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| CN101550906A (en) * | 2009-05-15 | 2009-10-07 | 北京工业大学 | DC electric machine variable pitch system and control method thereof |
| CN101624969A (en) * | 2009-08-04 | 2010-01-13 | 清华大学 | Redundancy control system and redundancy control method for wind power generation propeller change |
| CN101915206A (en) * | 2010-08-09 | 2010-12-15 | 重庆科凯前卫风电设备有限责任公司 | Variable pitch control unit and device thereof for wind driven generator |
| CN203925879U (en) * | 2014-06-20 | 2014-11-05 | 北京普华亿能风电技术有限公司 | A kind of electronic feathering control system |
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| US20120087792A1 (en) * | 2010-10-12 | 2012-04-12 | Clipper Windpower, Inc. | Emergency feather rate limit with proportionality to operating pitch angle and energy storage voltage |
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|---|---|---|---|---|
| CN101550906A (en) * | 2009-05-15 | 2009-10-07 | 北京工业大学 | DC electric machine variable pitch system and control method thereof |
| CN101624969A (en) * | 2009-08-04 | 2010-01-13 | 清华大学 | Redundancy control system and redundancy control method for wind power generation propeller change |
| CN101915206A (en) * | 2010-08-09 | 2010-12-15 | 重庆科凯前卫风电设备有限责任公司 | Variable pitch control unit and device thereof for wind driven generator |
| CN203925879U (en) * | 2014-06-20 | 2014-11-05 | 北京普华亿能风电技术有限公司 | A kind of electronic feathering control system |
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