CN203925879U - A kind of electronic feathering control system - Google Patents
A kind of electronic feathering control system Download PDFInfo
- Publication number
- CN203925879U CN203925879U CN201420334881.6U CN201420334881U CN203925879U CN 203925879 U CN203925879 U CN 203925879U CN 201420334881 U CN201420334881 U CN 201420334881U CN 203925879 U CN203925879 U CN 203925879U
- Authority
- CN
- China
- Prior art keywords
- feathering
- feathering control
- control switch
- direct current
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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 utility model provides a kind of electronic feathering control system, comprise the series connection circuit by DC electrical source and direct current feathering control switch KM5, AC driven power and frequency variator and the series connection circuit that exchanges feathering control switch KM3, altogether two-way circuit and connect rear composition and connection circuit, contact with direct current generator again, wherein, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is that interlocking is established, and is controlled respectively the break-make of described interchange feathering control switch KM3 and described direct current feathering control switch KM5 by described emergency feathering control relay K1.The utility model is to drive in feathering circuit and increased ac power supply as standby power supply in DC electrical source; when DC electrical source drives after feathering failure; by ac power supply, continued to drive the system of feathering; therefore in the technological scheme that the utility model provides; as long as guarantee direct current, to exchange feathering circuit You Yi road normal, can complete smoothly blower fan emergency feathering, improves the Security of wind-powered electricity generation unit; reduce the frequency of usage of direct current feathering circuit, protection battery simultaneously.
Description
Technical field
The utility model 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, by wheel hub anxious stop, column foot suddenly stops, suddenly stop in cabin, shock detection, main shaft hypervelocity, driftage limit switch series winding form, when these parts that are chained together have one to go wrong, whole series winding loop all can disconnect.Once blower fan theft-resistant link chain disconnects, blower fan will be reported emergency shutdown, now just by power source driving blade, realizes quick feathering, utilizes the aerodynamic characteristics of blade to realize aerodynamic brake, makes draught fan impeller stall, realizes dead halt.
In order to increase the protection to blower fan, feathering system generally all will be joined reserve battery so that guarantee can dead halt in the situation of unit generation catastrophe failure or major accident.
And direct current generator is with its stepless speed regulation, low-speed performance is good, simple in structure, control accuracy is high, and response is fast, thereby is widely used in wind turbine pitch system.Especially series DC machine starting torque is large, very good for the weigh blade of tens of meters of Shuo Dun ﹑ diameters of rotation.
But the shortcoming of this mode is to rely on battery operatedly, once battery damages or other reason causes battery to discharge, blower fan is normal feathering just, has increased non-cannot the shutdown of blower fan and caused the risk of " driving " in emergency situation.
Model utility content
Because the defect in prior art, the utility model provides blower fan after there is theft-resistant link chain fault, while starting emergency feathering system, while triggering theft-resistant link chain EFC signal (Emergency Feathering Control), in feathering circuit, first with direct current supply, drive feathering, then as standby power supply, drive the mode of feathering by ac power supply.
Theft-resistant link chain EFC signal is: the emergency feathering control signal triggering during theft-resistant link chain fault, by cabin, by slip ring wheel hub, being provided, is the charged normally closed loop design of 24V voltage, while there is not theft-resistant link chain fault, this circuit closed, i.e. theft-resistant link chain EFC signal output 24V high level; When there is theft-resistant link chain fault, this loop disconnects, and also, theft-resistant link chain EFC signal output 0V low level, now carries out feathering action.
The utility model 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 series winding with by AC driven power with frequency variator and exchange the circuit after feathering control switch KM3 contacts and connect, then be connected to direct current generator, exchanging feathering control switch KM3 and direct current feathering control switch KM5 is interlocking design, by emergency feathering control relay K1, controlled respectively the break-make that exchanges feathering control switch KM3 and direct current feathering control switch KM5.
System also comprises main limit switch S1, is blade 91 degree limit switches, and blade position reaches 91 degree, is triggered, and S1 disconnects, and needs in addition a redundancy limit switch S2, when blade position reaches 95 degree, is triggered, and S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor at main limit switch when 91 degree limit switches lose efficacy.
When limit switch S1, limit switch S2 are closed, also be that feathering is when unsuccessful, by the break-make of continuous control emergency feathering control relay K1, control being switched on or switched off of DC electrical source or AC driven power, reach according to first carrying out DC electrical source and drive feathering, carry out again the order that ac power supply drives feathering, drive feathering, until feathering success.
The utility model compared with prior art, in original direct current feathering circuit, to increase exchanges power supply to drive the alternating circuit of 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 through frequency variator frequency conversion output DC electrical source, with original direct current feathering circuit and link the direct current generator of feathering system, to realize the electronic feathering of blower fan.By the power supply of increasing exchanges, as standby power supply, drive feathering controlling method, as long as guarantee direct current, to exchange feathering circuit You Yi road normal, can complete smoothly blower fan emergency feathering, improves the Security of wind-powered electricity generation unit.
Emergency feathering control relay K1 is 24V control relay, by two kinds of modes, is controlled:
(1), by theft-resistant link chain EFC SC sigmal control, while 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), emergency feathering control relay disconnects;
(2) by exchanging emergency feathering control switch K2, control, K2 controls its break-make by time delay relay, by exchanging the given emergency feathering control relay of emergency feathering control switch K2 K1.When theft-resistant link chain fault occurs, and during the failure of direct current feathering, time delay relay is controlled and is exchanged emergency feathering control switch K2 conducting, and then emergency feathering control relay K1 conducting (be 24V high level), carries out interchange emergency feathering; When interchange feathering also failure, time delay relay works on, and controls and exchanges emergency feathering control switch K2 disconnection, and then emergency feathering control relay K1 disconnection (being 0V low level), carries out direct current emergency feathering.
Preferably, time delay relay be can increase, for controlling DC electrical source, the time of feathering and the time that AC driven power drives feathering driven.
Whether successfully feathering judgement is: whether feathering is to the 91 spacing positions of degree for blade.Need in addition a redundancy limit switch, spacing for 95 degree, at main limit switch, when 91 degree limit switches lose efficacy, can guarantee the safety brake of pitch motor.
Preferably, in DC circuit, can provide a dc circuit breaker, for direct current main power switch, provide overcurrent protection; A circuit breaker can also be provided in alternating circuit, for ac main power switch, provide overcurrent protection.
AC driven power is 400V (L1-3, N); Ac control power supply is 230V, by wheel hub slip ring 400V power supply, is provided, and ups power (6) is 230V Ac, with power source, through wheel hub slip ring, in wheel hub, powers.
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 described in the utility model each other standby controlling method be specifically described.
Fig. 1 is circuit diagram of the present utility model.
Embodiment
A kind of electronic feathering controlling method and system that the utility model provides, being only applicable to fault type is theft-resistant link chain fault.
Theft-resistant link chain EFC signal is: the emergency feathering control signal triggering during theft-resistant link chain fault, by cabin, by slip ring wheel hub, provided, and be the charged normally closed loop design of 24V voltage, once this loop disconnects, will trigger EFC signal, carry out feathering action.
As shown in Figure 1, the utility model 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 series winding with AC driven power 4 with frequency variator 7 and exchange the circuit after feathering control switch KM3 contacts 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, by emergency feathering control relay, K1 controls respectively.
Wherein, emergency feathering control relay K1 is 24V control relay, by two path control signal, is controlled:
1) be theft-resistant link chain EFC SC sigmal control, when there is theft-resistant link chain fault, EFC24V power supply dead electricity, triggers EFC signal (low level), and emergency feathering control relay K1 disconnects;
2) by exchanging emergency feathering control switch K2, control, when theft-resistant link chain fault occurs, and during the failure of direct current feathering, exchange emergency feathering control switch K2 conducting, control emergency feathering control relay K1 conducting (being 24V high level), carry out 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 (being 0V low level), carry out direct current emergency feathering.
System also comprises main limit switch S1, is blade 91 degree limit switches, and blade position reaches 91 degree, is triggered, and S1 disconnects, and needs in addition a redundancy limit switch S2, when blade position reaches 95 degree, is triggered, and S2 disconnects.Limit switch S2 can guarantee the safety brake of pitch motor at main limit switch when 91 degree limit switches lose efficacy.
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 that exchanges feathering control switch KM3 adopts ac control power supply 5 power supplies; The control loop of direct current feathering control switch KM5 adopts ups power 6 power supplies.
Exchange the control loop of feathering control switch KM3: by the normally-closed contact of emergency feathering control relay K1 normally opened contact, limit switch S1, limit switch S2 and direct current feathering control switch KM5 and the coil that exchanges feathering control switch KM3, contacted;
The control loop of direct current feathering control switch KM5: by emergency feathering control relay K1 normally-closed contact, limit switch S1, limit switch S2 with exchange the normally-closed contact of feathering control switch KM3 and the coil of direct current feathering control switch KM3 is contacted.
The utility model also arranges time delay relay KT1, KT2, and wherein, the ON time that exchanges emergency feathering control switch K2 is the delay time of delay time-time delay relay KT1 of time delay relay KT2; The delay time that the time that exchanges emergency feathering control switch K2 disconnection is KT1, KT2 delay time is greater than the delay time of KT1.
System also comprises control relay K4, by safety chain signal, controlled, and when there is theft-resistant link chain fault, EFC24V power supply dead electricity, relay K 4 disconnects.
KT1/KT2 control loop: circuit series winding after relay K 4 normally-closed contacts and time delay relay KT1 and time delay relay KT2 in parallel;
Exchange emergency feathering control switch K2 control loop: the normally-closed contact of the normally opened contact of time delay relay KT1, 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 closure, relay K 4 closures, interchange emergency feathering control switch K2 disconnect, it is closed that direct current feathering control switch KM5 disconnects, exchanges feathering control switch KM3, 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 carry out DC electrical source and drive feathering action, emergency feathering control relay K1 disconnects.Due to the normally opened contact disconnection of time delay relay KT1, so exchange emergency feathering control switch K2 control loop, disconnect.
Due to, emergency feathering control relay K1 disconnects, and emergency feathering control relay K1 normally opened contact disconnects, so exchange feathering control switch KM3 control loop, disconnects; Now because the normally-closed contact that emergency feathering control relay K1 normally-closed contact is closed, limit switch does not trigger (closure), interchange feathering control switch KM3 (disconnecting) is closed, therefore the control loop conducting of direct current feathering control switch KM5, now drives feathering by DC electrical source 3.
Postpone after a period of time (being the delay time of time delay KT1): if limit switch S1 or S2 are not triggered, direct current feathering failure, continues to carry out next step; If limit switch S1 or S2 are triggered, direct current feathering success, exchanges the control loop of feathering control switch KM3 and the control loop of direct current feathering control switch KM5 and all disconnects, and native system is carried out and finished.
(2) if the failure of direct current feathering, carry out ac power supply and drive feathering action, after reaching the delay time of 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 is closed, the normally-closed contact of time delay relay KT2 is closed, exchanges emergency feathering control switch K2 and connects.
Owing to exchanging emergency feathering control switch K2, connect, 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 the normally-closed contact that emergency feathering control relay K1 normally opened contact is closed, limit switch does not trigger (closure), direct current feathering control switch KM5 (disconnecting) is closed, therefore exchange the control loop conducting of feathering control switch KM3, system is switched to the feathering circuit being driven by AC driven power 4 and continues to carry out feathering.
(delay time that is time delay relay KT2 arrives, and now the ON time apart from time delay relay KT1 is: the delay time of delay time-KT1 of KT2): if limit switch S1 or S2 are not triggered, exchange feathering failure to postpone a period of time; If limit switch S1 or S2 are triggered, exchange feathering success, native system is carried out and is finished.
(3) exchange feathering and be finished, after reaching the delay time of 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 and disconnect, emergency feathering control signal K1 disconnects, and native system is carried out and finished.
Preferably, also comprise and exchange 400V control switch, axle control cabinet 2 electric after, switch on power, for frequency variator provides, exchange 400V power supply.
Preferably, also comprising AC circuit breaker Q1, is 400V power switch, and AC driven power 4, ac power switch Q1 and interchange 400V control switch KM4 are connected.
Preferably, also comprising dc circuit breaker Q2, is DC power supply switch, DC electrical source 3, direct current main power switch Q2 and DC electrical source feathering control switch KM5 series winding.
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 shown in Figure 1, in figure, listed 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, by two path control signal, controlled:
1) be theft-resistant link chain EFC SC sigmal control, when there is theft-resistant link chain fault, EFC24V power supply dead electricity, triggers EFC signal (low level), and emergency feathering control relay K1 disconnects;
2) by exchanging emergency feathering control switch K2, control, K2 controls its break-make by time delay relay, by exchanging the given emergency feathering control relay of emergency feathering control switch K2 K1.When theft-resistant link chain fault occurs, and during the failure of direct current feathering, time delay relay is controlled and is exchanged emergency feathering control switch K2 conducting, and then emergency feathering control relay K1 conducting (be 24V high level), carries out interchange emergency feathering; When interchange feathering also failure, time delay relay works on, and controls and exchanges emergency feathering control switch K2 disconnection, and then emergency feathering control relay K1 disconnection (being 0V low level), carries out direct current emergency feathering.
K2: control relay, exchanges emergency feathering control switch.By relay K 4, and two time delay relay KT1, KT2 acting in conjunction, control K2 conducting and disconnection, when theft-resistant link chain fault, it controls emergency feathering control relay K1.
K4: control relay, by safety chain signal, controlled, when there is theft-resistant link chain fault, EFC24V power supply dead electricity, relay K 4 disconnects.
KT1: obtain electric time lagged type time delay relay, control the time that emergency feathering control switch K2 disconnects that exchanges.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 mono-of KT1 the ON time (delay time of delay time-time delay relay KT1 of time delay relay KT2) that exchanges emergency feathering control switch K2, the delay time of KT2 is greater than the delay time of KT1, and the delay time of KT2 is the twice of the delay time of KT1.The time of the time delay of KT2 can be the random time between 24 seconds to 40 seconds, preferably 30 seconds.
KM3: contactor, exchange feathering control switch, for direct current generator provides DC electrical source, obtain electric after, connect the output of frequency variator direct current and direct current generator, enable frequency variator simultaneously, output DC electrical source, carries out ac power supply and drives and become oar action.On condition: emergency feathering control relay K1 conducting (being high level), meanwhile, direct current feathering control switch KM5 is off state, simultaneously, blade 91 degree, 95 degree position limit switch access failures, blade does not reach 91 degree, 95 degree positions, and S1, S2 are closed state.
KM4: contactor, the control switch of 400V ac power supply 4, axle control cabinet 2 electric after, by ac control power supply 5, powered, 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, DC electrical source drives feathering action.On condition: theft-resistant link chain EFC signal is triggered, emergency feathering control relay K1 disconnects, and exchanges feathering circuit switch KM3 disconnection, simultaneously, blade 91 degree, 95 degree position limit switch access failures, blade does not reach 91 degree, 95 degree positions, and S1, S2 are closed state.
S1: be blade 91 degree limit switches, blade position reaches 91 degree, is triggered, and S1 disconnects.
S2: be blade 95 degree limit switches, blade position reaches 95 degree, is triggered, and S2 disconnects.When losing efficacy, guarantees limit switch S1 the safety brake of pitch motor.
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, for exchanging feathering control switch KM3, provides control power supply.
Ups power 6,230V is powered to wheel hub through wheel hub slip ring by the UPS device that is positioned at engine room control cabinet, and for direct current feathering control switch, KM5 provides control power supply.
DC electrical source 3 can be battery pack, by 5 chargings of 230V ac control power supply.
By the power supply of increasing exchanges, as standby power supply, drive feathering controlling method, as long as guarantee direct current, to exchange feathering circuit You Yi road normal, can complete smoothly blower fan emergency feathering, improves the Security of wind-powered electricity generation unit.
The above is only preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction, although the utility model discloses as above with preferred embodiment, yet not in order to limit the utility model, any technician who is familiar with this patent is not departing within the scope of technical solutions of the utility model, when can utilizing the technology contents of above-mentioned prompting to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solutions of the utility model, any simple modification of above embodiment being done according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of the utility model scheme.
Claims (7)
1. an electronic feathering control system, it is characterized in that: 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, wherein
The series connection circuit of described DC electrical source (3) and described direct current feathering control switch KM5,
Described AC driven power (4) and described frequency variator (7) and the described series connection circuit that exchanges feathering control switch KM3,
Altogether two-way circuit and connect rear composition and connection circuit, with described direct current generator (8) series winding,
Described interchange feathering control switch KM3 and described direct current feathering control switch KM5 are interlocking designs, are controlled respectively the break-make of described interchange feathering control switch KM3 and described direct current feathering control switch KM5 by described emergency feathering control relay K1.
2. electronic feathering control system according to claim 1, it is characterized in that, also comprise and exchange emergency feathering control switch K2 and theft-resistant link chain EFC signal, described theft-resistant link chain EFC signal is provided by slip ring wheel hub by cabin, the normally opened contact of described interchange emergency feathering control switch K2, with described theft-resistant link chain EFC signal and after connecting, then contact with the coil of described emergency feathering control relay K1.
3. electronic feathering control system according to claim 2, it is characterized in that, also comprise time delay relay KT1 and time delay relay KT2, the normally-closed contact of the normally opened contact of described time delay relay KT1, described time delay relay KT2 and the described coil series winding that exchanges emergency feathering control switch K2.
4. electronic feathering control system according to claim 3, is characterized in that, the delay time of described time delay relay KT1 is 15 seconds, and the delay time of described time delay relay KT2 is 30 seconds.
5. electronic feathering control system according to claim 1, is characterized in that, also comprises 91 degree limit switch S1 and 95 degree limit switch S2, when blade pitch angle is 91 while spending, triggers limit switch S1, and described limit switch S1 is closed; When blade pitch angle is 95 while spending, trigger limit switch S2, described limit switch S2 is closed.
6. electronic feathering control system according to claim 5, it is characterized in that the normally-closed contact of the normally opened contact of described emergency feathering control relay K1, described limit switch S1, described limit switch S2, described interchange feathering control switch KM3 and the coil of described direct current feathering control switch KM5 series winding.
7. electronic feathering control system according to claim 5, it is characterized in that the normally-closed contact of the normally-closed contact of described emergency feathering control relay K1, described limit switch S1, described limit switch S2, described direct current feathering control switch KM5 and the described coil series winding that exchanges feathering control switch KM3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420334881.6U CN203925879U (en) | 2014-06-20 | 2014-06-20 | A kind of electronic feathering control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420334881.6U CN203925879U (en) | 2014-06-20 | 2014-06-20 | A kind of electronic feathering control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203925879U true CN203925879U (en) | 2014-11-05 |
Family
ID=51821700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420334881.6U Expired - Fee Related CN203925879U (en) | 2014-06-20 | 2014-06-20 | A kind of electronic feathering control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203925879U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2014
- 2014-06-20 CN CN201420334881.6U patent/CN203925879U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104047803B (en) * | 2014-06-20 | 2016-01-20 | 北京普华亿能风电技术有限公司 | A kind of electronic feathering controlling method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201247964Y (en) | Power supply for variable pitch system | |
| CN102060220A (en) | Automatic rescue device for elevator | |
| CN103016265B (en) | Alternating current pitch control system using electric network to drive emergency feathering | |
| WO2022088376A1 (en) | Automatic emergency yaw control system and method for preventing runaway of wind generator set | |
| CN104047803B (en) | A kind of electronic feathering controlling method | |
| CN102882441B (en) | A kind of threephase asynchronous electric brake arrangement and control method thereof | |
| CN103452755B (en) | A kind of controlling method of putting away the oars of wind power generating set direct current variable pitch control system | |
| CN204118813U (en) | Direct-current charging post main circuit dual control electric power system | |
| CN203925879U (en) | A kind of electronic feathering control system | |
| CN102913388B (en) | Emergency propeller retraction system of wind generating set and control method | |
| CN203879683U (en) | Electric feathering control system | |
| CN103683466A (en) | Emergent direct supply off-grid photovoltaic power supply system based on existing photovoltaic controller | |
| CN204267215U (en) | The pitch motor drive unit of wind power generating set | |
| CN104300565A (en) | Pitch system and power supply method of pitch system | |
| CN103644074B (en) | The Anti-Typhoon control method of wind power generating set and hardware platform thereof | |
| CN104061120B (en) | A kind of electronic feathering controlling method | |
| CN211405917U (en) | Control device for star-sealing braking of motor | |
| CN206203613U (en) | Envelope star delay protection device | |
| CN205986638U (en) | Switching power supply device and change oar system control cabinet | |
| CN202004716U (en) | Control system of wind driven generator | |
| CN211343213U (en) | Full-speed-domain braking device of permanent magnet synchronous power generation fan | |
| CN202867090U (en) | Emergency oar-retracting of wind generating set | |
| CN103410661B (en) | A kind of device of putting away the oars exchanging variable-pitch control system | |
| CN102518554B (en) | Variable-pitch control system for wind generating set | |
| CN205754073U (en) | A kind of Excitation System on Pumped Storage Power Stations black starting-up control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20180620 |