CN105227015A - Conveniently patrol and examine the wind turbine generator that maintenance type fault tolerant runs - Google Patents
Conveniently patrol and examine the wind turbine generator that maintenance type fault tolerant runs Download PDFInfo
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- CN105227015A CN105227015A CN201510665514.3A CN201510665514A CN105227015A CN 105227015 A CN105227015 A CN 105227015A CN 201510665514 A CN201510665514 A CN 201510665514A CN 105227015 A CN105227015 A CN 105227015A
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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
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Abstract
The invention discloses a kind of wind turbine generator of conveniently patrolling and examining maintenance type fault tolerant and running, comprise wind turbine, fault-tolerance aerogenerator, modular power converters, multiple sensor signals detector, electrical equipment failure differentiation and ring controller, logic switch and pulse-width-modulation driver in indicating device, the outer ring controller of full blast speed optimum torque, fault-tolerant decision-making.The present invention has wind generating set structure and the Drive Control Technique thereof of fault-tolerant operation ability and low torque ripple, can occur under certain unit electrical fault conditions, continue safe and reliable and near rated capacity ground generator operation, and it is simple to have mechanical structure, electrical reliability is strong, modular assembly degree is high and conveniently patrol and examine the features such as maintenance.
Description
The application is application number: 201410052039.8, the applying date: 2014.2.17, title: the divisional application of " wind turbine generator that fault tolerant runs ".
Technical field
The present invention relates to wind-driven generator and Fault Tolerance Control Technology field, be specifically related to the wind turbine generator that a kind of fault tolerant runs.
Background technology
Wind power generation is the regenerative resource of current most extensive development potentiality, and every country has all dropped into a huge sum of money and competitively researched and developed, and actively pushes forward industrialization process, application of exploiting market energetically.
Due to wind resource distribution, wind power plant is installed on the physical features eminence in geographical and that meteorological condition is more severe suburb or urban district more.Once equipment installs, operational management and the repair and maintenance of unit are extremely inconvenient, and for this reason, the continuous reliability service ability improving wind turbine generator is an important technology in wind power plant research and development manufacture field.Due to one of core component that wind-driven generator is in wind power plant, therefore, its reliability service and fault-tolerant operation ability particularly important.
At present, the generator for wind generator system mainly contains threephase alternator, DC permanent-magnetic brushless generator and switch reluctance generator.Threephase alternator (as synchronous, double-fed asynchronous, mouse cage asynchronous, winding asynchronous in permanent-magnet synchronous, electric excitation etc.) and DC permanent magnetic generator; adopt distributed symmetric winding construction; when a certain phase winding generation open circuit or short trouble; or a certain phase power inverter is when breaking down; air-gap field distorts; cause generator out of control from operation mechanism; the basic controlling target as wind power generations such as most strong wind power tracking controls cannot be reached; if shut down not in time, its serious torque is jolted and will inevitably be damaged plant equipment.Switch reluctance generator adopts symmetrical concentratred winding, when a certain phase winding generation open circuit or short trouble, or a certain phase power inverter is when breaking down, although can run by phase-lacking fault-tolerant, but the pulsation of its intrinsic teeth groove and the radial magnetic pull characteristic of imbalance can be exaggerated, generating torque produces periodically serious pulsation, very easily causes the damage of wind turbine and accessory machinery thereof and the dangerous of unit.
Therefore, from raising reliability index angle, avoid the generator of traditional distributed symmetric winding structure cannot phase-deficient operation, and the deficiency of the large torque pulsation of switch reluctance generator, research and design is a set of has the wind-driven generator of fault-tolerant operation ability and low torque ripple and driving control system has good engineering and economic implications.
Summary of the invention
The object of the invention is to: in order to solve traditional wind group, when electrical power generators phase winding is short-circuited or open circuit fault, or when the damage of some power electronic element of power inverter, unit cannot continue the problem of safe and reliable generator operation, a set of wind generating set structure and the Drive Control Technique thereof with fault-tolerant operation ability and low torque ripple of invention design, enable occurring under certain unit electrical fault conditions, continue safe and reliable and near rated capacity ground generator operation, and it is simple to have mechanical structure, electrical reliability is strong, modular assembly degree is high and conveniently patrol and examine the features such as maintenance.
Technical solution of the present invention is:
The wind turbine generator that fault tolerant runs, is characterized in that: comprise wind turbine, fault-tolerance aerogenerator, modular power converters, multiple sensor signals detector, electrical equipment failure differentiation and ring controller, logic switch and pulse-width-modulation driver in indicating device, the outer ring controller of full blast speed optimum torque, fault-tolerant decision-making;
Described fault-tolerance aerogenerator, be included in stator circumference space, evenly staggered m stator electromagnet isolates tooth and m stator armature generating tooth, individual centralized power generation winding phase, the sinusoidal permanent magnet array of Surface Mount on rotor diameter generated electricity on tooth around stator armature of m at equal intervals; Its rotor is connected with wind turbine rotary main shaft;
Described modular power converters, includes m the single-phase sine-converter circuit of H bridge; Each H bridge single-phase sine-converter circuit is all connected with negative pole with DC bus positive pole respectively by 2 electric gate-controlled switches; Each H bridge single-phase sine-converter circuit is all connected with 1 winding that generates electricity of fault-tolerance aerogenerator mutually by 1 electric gate-controlled switch;
Described multiple sensor signals detector, comprises air velocity transducer, speed probe, voltage sensor, current sensor; Realize the detection to the voltage and current of wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and its m winding phase;
Described electrical equipment failure differentiates and indicating device, according to the analysis of the voltage and current signal of the fault-tolerance aerogenerator m winding provided multiple sensor signals detector, in fault-tolerant decision-making, ring controller provides the numbering of fault-tolerance aerogenerator k fault winding phase, and the fault type of k fault winding phase, wherein k≤m; And utilize display device to indicate the numbering of k fault winding phase and the fault type of correspondence thereof;
The outer ring controller of described full blast speed optimum torque, wind energy according to wind turbine absorbs best torque curved line relation, and the electric current of wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and its m generating winding phase that provides of multiple sensor signals detector and voltage signal, in fault-tolerant decision-making, ring controller provides optimal power generation total current control command signal;
Ring controller in described fault-tolerant decision-making, number mutually with k fault winding according to optimal power generation total current control command signal, wait according to coordination and hold allocation algorithm, calculate the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) individual non-faulting winding is mutually respective;
Described logic switch and pulse-width-modulation driver, the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) the individual non-faulting winding provided according to ring controller in fault-tolerant decision-making is mutually respective, forms the pwm control signal of the single-phase sine-converter circuit of corresponding (m-k) individual healthy phases H bridge; And the disconnection control signal of 3k electric gate-controlled switch in the single-phase sine-converter circuit of H bridge corresponding to k fault phase.
Described fault-tolerance aerogenerator m the generating voltage waveform that export mutually of generating winding is sinusoidal waveform.
Described electrical equipment failure differentiates and indicating device, can determine power electronic element failure of removal, winding overhang open circuit fault, winding overhang short trouble online; And fault distinguishing result is shown in real time.
In described fault-tolerant decision-making, allocation algorithm is held in the coordination etc. of ring controller, circular magnetic field is formed for target with fault-tolerance aerogenerator (m-k) individual healthy phases optimal power generation phase current command signal vector separately, minimum and total generation current value equals or be constraints close to optimal power generation total current control command signal value with copper loss.
In described fault-tolerant decision-making, the numerical value of fault-tolerance aerogenerator (m-k) the individual non-faulting winding optimal power generation phase current command signal separately that ring controller calculates can not be identical.
Described modular power converters, can differentiate and the numbering of the fault winding phase that indicating device indicates and corresponding fault type thereof according to electrical equipment failure, carry out online on-line maintenance.
Fault-tolerance aerogenerator m stator electromagnet isolation tooth and m stator armature generating tooth are in stator circumference space, and be evenly staggered at equal intervals, its end all has pole shoe structure, to obtain good magnetic field sine distribution character; M stator electromagnet isolation tooth does not all install around winding.
Electrical equipment failure differentiates that the rule of carrying out fault distinguishing with indicating device comprises: (1) is if the electric current of certain winding phase that generates electricity of fault-tolerance aerogenerator, mean value in one-period is not equal to zero, and with zero phase error is larger, obviously be not equal to the average current value of other phases, then show, the single-phase sine-converter circuit of the H bridge be connected with this generating winding there occurs " power electronic element lost efficacy " fault; (2) if the current instantaneous value of certain generating winding phase of fault-tolerance aerogenerator, in multiple detection sampling period, be equal to zero, be obviously not equal to the current value of other phases, then show, this generating winding there occurs " winding overhang open circuit " fault mutually; (3) if the current effective value of certain generating winding phase of fault-tolerance aerogenerator becomes suddenly large, meanwhile, floating voltage effective value diminishes suddenly, is obviously not equal to the voltage and current value of other phases, then show, this generating winding there occurs " winding overhang short circuit " fault mutually.
Compared with prior art the invention has the advantages that:
(1) fault-tolerance aerogenerator can when part phase winding be short-circuited or open circuit fault, electrical isolation fault phase winding rapidly online, and phase shortage generator operation can be continued;
(2) fault-tolerance aerogenerator under the power electronic element failure conditions of the single-phase sine-converter circuit of modular power converters part H bridge, can excise the single-phase sine-converter circuit of fault H bridge, and can continue phase shortage generator operation online rapidly;
(3) fault-tolerance aerogenerator respectively mutually generate electricity winding work alone, the generation current of each phase can independently control;
(4) fault-tolerance aerogenerator holds algorithm assigns by the coordination to optimal power generation direct torque command signal etc., ensures that generator always generates electricity electromagnetic torque in phase-deficient operation situation, large torque does not occur yet and falls or pulse.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is overall construction drawing of the present invention.
Fig. 2 is the sectional structure chart of fault-tolerance aerogenerator.
Fig. 3 is modular power converters structure chart.
Fig. 4 is the control principle drawing of the outer ring controller of full blast speed optimum torque.
Embodiment
For the wind turbine generator that a kind of fault tolerant runs, the invention will be further described by reference to the accompanying drawings.
See accompanying drawing 1, the wind turbine generator of described a kind of fault-tolerant operation partly forms with ring controller, logic switch and pulse-width-modulation driver etc. in indicating device, the outer ring controller of full blast speed optimum torque, fault-tolerant decision-making primarily of wind turbine, fault-tolerance aerogenerator, modular power change device, multiple sensor signals detector, electrical equipment failure differentiation.
See accompanying drawing 2, fault-tolerance aerogenerator forms around the centralized power generation winding phase 4 on stator armature generating tooth 3, rotor 5, the sinusoidal permanent magnet array 6 of Surface Mount on rotor diameter primarily of stator 1, m stator electromagnet isolation tooth 2 on stator circumference internal diameter, m stator armature generating tooth 3 on stator circumference internal diameter, m.M stator electromagnet isolation tooth 2 and m stator armature generating tooth 3 are in stator circumference space, and be evenly staggered at equal intervals, its end all has pole shoe 7 structure, to obtain good magnetic field sine distribution character; M stator electromagnet isolation tooth 2 does not all install around winding; In Fig. 2, m=8.According to Electrical Motor principle, isolate the effect of tooth 2 at stator electromagnet under, the electromagnetic coupled interference of each generating winding mutually between 4 is very little, and the independence that can realize each generating winding phase 4 controls.
The rotor 6 of fault-tolerance aerogenerator is given a dinner for a visitor from afar the rotary main shaft of turbine, stator 1 geo-stationary of fault-tolerance aerogenerator.When rotating under the drive of fault-tolerance aerogenerator rotor 6 at wind turbine, its m centralized power generation winding 4 under the cutting of permanent magnetism sine magnetic power air-gap field, can produce sinusoidal generating voltage mutually.
See accompanying drawing 3, the centralized power generation winding phase 4 of fault-tolerance aerogenerator, by electric gate-controlled switch 13, is connected with the single-phase sine-converter circuit 8 of the H bridge of modular power converters.The H bridge single-phase sine-converter circuit 8 of modular power converters is connected with bus positive pole 9 by electric gate-controlled switch 11, is connected with bus negative pole 10 by electric gate-controlled switch 12.The number of H bridge single-phase sine-converter circuit 8 of modular power converters is identical with the number of the centralized power generation winding phase of fault-tolerance aerogenerator.Modular power converters, can differentiate and the numbering of the fault winding phase that indicating device indicates and corresponding fault type thereof according to electrical equipment failure, carry out online on-line maintenance.
Multiple sensor signals detector, comprises air velocity transducer, speed probe, voltage sensor, current sensor; Realize the detection of the voltage and current to wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and m generating winding phase.
Electrical equipment failure differentiates and indicating device, according to the voltage and current signal of fault-tolerance aerogenerator m the generating winding phase 4 that multiple sensor signals detector provides, carries out fault distinguishing.Its rule comprises: (1) is if the electric current of certain generating winding phase of fault-tolerance aerogenerator, mean value in one-period is not equal to zero, and with zero phase error is larger, obviously be not equal to the average current value of other phases, then show, the single-phase sine-converter circuit of the H bridge be connected with this generating winding there occurs " power electronic element lost efficacy " fault.(2) if the current instantaneous value of certain generating winding phase of fault-tolerance aerogenerator, in multiple detection sampling period, be equal to zero, be obviously not equal to the current value of other phases, then show, this generating winding there occurs " winding overhang open circuit " fault mutually.(3) if the current effective value of certain generating winding phase of fault-tolerance aerogenerator becomes suddenly large, meanwhile, floating voltage effective value diminishes suddenly, is obviously not equal to the voltage and current value of other phases, then show, this generating winding there occurs " winding overhang short circuit " fault mutually.
Electrical equipment failure differentiates and indicating device, according to above-mentioned rule, carries out fault distinguishing, obtains the numbering of fault-tolerance aerogenerator k fault winding phase, wherein k≤m; And the fault type that k fault winding is mutually corresponding; These fault types comprise: power electronic element failure of removal, winding overhang open circuit fault, winding overhang short trouble.
Electrical equipment failure differentiates and indicating device, and by the numbering of k fault winding phase detected, and the mutually corresponding fault type of k fault winding is supplied to display device and indicates, for attendant's fast inspection and the maintenance of generating set.
See accompanying drawing 4, the outer ring controller of full blast speed optimum torque, the fault-tolerance aerogenerator rotational speed omega first provided according to multiple sensor signals detector and the current i of m the winding phase that generates electricity thereof
xwith voltage u
xsignal (x=1,2 ..., m), converse current total generating electromagnetic torque value T
ef; The wind speed v signal provided according to multiple sensor signals detector again and wind turbine rotational speed omega
wtsignal, the wind energy according to wind turbine absorbs best torque curved line relation, obtains current optimum pneumatic torque signal T
opm*; Optimum pneumatic torque signal and current total generating electromagnetic torque value are subtracted each other, T
opm*-T
ef, its difference carries out pid control algorithm computing, draws current optimal power generation total current control command signal i
qand be supplied to ring controller in fault-tolerant decision-making *.
Described logic switch and pulse-width-modulation driver, the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) the individual non-faulting winding provided according to ring controller in fault-tolerant decision-making is mutually respective, forms the pwm control signal of the single-phase sine-converter circuit of corresponding (m-k) individual healthy phases H bridge; And the disconnection control signal of 3k electric gate-controlled switch in the single-phase sine-converter circuit of H bridge corresponding to k fault phase.Specifically, ring controller in fault-tolerant decision-making, first the numbering of k the fault winding phase provided with indicating device is differentiated according to electrical equipment failure, output logic control signal is to logic switch and pulse-width-modulation driver, the pwm control signal making corresponding failure winding number the power electronic element in the single-phase sine-converter circuit 8 of corresponding H bridge mutually blocks, and the electric gate-controlled switch 11,12,13 that is connected its 3 disconnects, to reach object k fault winding being realized mutually to electrical isolation.
Because this k fault winding achieves electrical isolation mutually, therefore, the attendant of generating set can differentiate numbering and the fault type thereof of the fault winding phase that indicate with indicating device according to electrical equipment failure, carry out online on-line maintenance.Comprising: for " power electronic element failure of removal ", the single-phase sine-converter circuit of H bridge that this fault winding phase connects directly can be changed, to get rid of this fault; For " winding overhang open circuit fault " and " winding overhang short trouble ", can measure to determine concrete fault point by manual observation with further, to get rid of this fault, or do conservative process, wait until entirety maintenance in the future.
In described fault-tolerant decision-making, the numerical value of fault-tolerance aerogenerator (m-k) the individual non-faulting winding optimal power generation phase current command signal separately that ring controller calculates can not be identical.
Ring controller in fault-tolerant decision-making, then according to the current optimal power generation total current control command signal i that the outer ring controller of full blast speed optimum torque provides
q*, wait according to coordination and hold allocation algorithm, to the optimal power generation phase current command signal i of each phase of fault-tolerance aerogenerator residue (m-k) individual non-faulting generating winding phase partitioning
qp*, wherein, p=1,2 ..., m-k.It is coordinated to wait and holds allocation algorithm with this (m-k) individual healthy phases optimal power generation phase current command signal i separately
qp* vector forms circular magnetic field is target, minimum and total generation current value equals or close to optimal power generation total current control command signal i with copper loss
q* be constraints, concrete solving equation can be expressed as
Formula (1) the equal sign left side represents the whole m of fault-tolerance aerogenerator generating winding when all normally working mutually, the circular rotating magnetic potential that should produce, fault-tolerance aerogenerator is represented when only there being (m-k) individual non-faulting generating winding normally to work mutually, the required circular rotating magnetic potential produced of each healthy phases on the right of equal sign.Formula (1) ensure that fault-tolerance aerogenerator is electrically isolated before and after excision k generating winding phase factor fault, and the magnetic potential of generation is equal, and namely circular magnetic field and total current are worth constant coordination etc. and hold distribution principle.Formula (2) is (m-k) individual non-faulting generating winding phase current i
ythe copper loss produced, wherein, y=1,2 ..., m-k.Because there is the situation of separating in formula (1), therefore, add formula (2) and get this constraints of minimum value, the solution of formula (1) can be made unique more.Obviously, i
ylast solution be i
qp*.
In fault-tolerant decision-making, ring controller will resolve the optimal power generation phase current command signal i of (m-k) the individual non-faulting winding phase obtained
qp* logic switch and pulse-width-modulation driver is supplied to.Logic switch and pulse-width-modulation driver adopt the stagnant ring modulation control method containing current closed-loop, form the pwm control signal of the power electronic element in corresponding (m-k) individual non-faulting winding single-phase sine-converter circuit 8 of H bridge corresponding mutually, finally to complete the object that the optimum wind-powered electricity generation power conversion of this wind turbine generator under full blast speed operating mode controls.
Claims (4)
1. conveniently patrol and examine the wind turbine generator that maintenance type fault tolerant runs, it is characterized in that: comprise wind turbine, fault-tolerance aerogenerator, modular power converters, multiple sensor signals detector, electrical equipment failure differentiation and ring controller, logic switch and pulse-width-modulation driver in indicating device, the outer ring controller of full blast speed optimum torque, fault-tolerant decision-making;
Described fault-tolerance aerogenerator, be included in stator circumference space, evenly staggered m stator electromagnet isolates tooth and m stator armature generating tooth, individual centralized power generation winding phase, the sinusoidal permanent magnet array of Surface Mount on rotor diameter generated electricity on tooth around stator armature of m at equal intervals; Its rotor is connected with wind turbine rotary main shaft;
Described modular power converters, includes m the single-phase sine-converter circuit of H bridge; Each H bridge single-phase sine-converter circuit is all connected with negative pole with DC bus positive pole respectively by 2 electric gate-controlled switches; Each H bridge single-phase sine-converter circuit is all connected with 1 winding that generates electricity of fault-tolerance aerogenerator mutually by 1 electric gate-controlled switch;
Described multiple sensor signals detector, comprises air velocity transducer, speed probe, voltage sensor, current sensor; Realize the detection to the voltage and current of wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and its m winding phase;
Described electrical equipment failure differentiates and indicating device, according to the analysis of the voltage and current signal of the fault-tolerance aerogenerator m winding provided multiple sensor signals detector, in fault-tolerant decision-making, ring controller provides the numbering of fault-tolerance aerogenerator k fault winding phase, and the fault type of k fault winding phase, wherein k≤m; And utilize display device to indicate the numbering of k fault winding phase and the fault type of correspondence thereof;
The outer ring controller of described full blast speed optimum torque, absorb electric current and the voltage signal of wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and its m the winding phase that generates electricity that best torque curved line relation and multiple sensor signals detector provide according to the wind energy of wind turbine, in fault-tolerant decision-making, ring controller provides optimal power generation total current control command signal;
Ring controller in described fault-tolerant decision-making, number mutually with k fault winding according to optimal power generation total current control command signal, wait according to coordination and hold allocation algorithm, calculate the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) individual non-faulting winding is mutually respective; The numerical value of the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) the individual non-faulting winding that in described fault-tolerant decision-making, ring controller calculates is mutually respective can not be identical;
Described logic switch and pulse-width-modulation driver, the optimal power generation phase current command signal that fault-tolerance aerogenerator (m-k) the individual non-faulting winding provided according to ring controller in fault-tolerant decision-making is mutually respective, forms the pwm control signal of the single-phase sine-converter circuit of corresponding (m-k) individual healthy phases H bridge; And the disconnection control signal of 3k electric gate-controlled switch in the single-phase sine-converter circuit of H bridge corresponding to k fault phase;
Described fault-tolerance aerogenerator m the generating voltage waveform that export mutually of generating winding is sinusoidal waveform;
In described fault-tolerant decision-making, allocation algorithm is held in the coordination etc. of ring controller, circular magnetic field is formed for target with fault-tolerance aerogenerator (m-k) individual healthy phases optimal power generation phase current command signal vector separately, minimum and total generation current value equals or be constraints close to optimal power generation total current control command signal value with copper loss.
2. the wind turbine generator of conveniently patrolling and examining maintenance type fault tolerant and running according to claim 1, it is characterized in that: described electrical equipment failure differentiates and indicating device, can determine power electronic element failure of removal, winding overhang open circuit fault, winding overhang short trouble online; And fault distinguishing result is shown in real time.
3. the wind turbine generator of conveniently patrolling and examining maintenance type fault tolerant and running according to claim 1, is characterized in that: stator electromagnet isolation tooth and stator armature generating tooth are in stator circumference space, and be evenly staggered at equal intervals, its end all has pole shoe structure.
4. the wind turbine generator of conveniently patrolling and examining maintenance type fault tolerant and running according to claim 1, it is characterized in that: the centralized power generation winding phase of fault-tolerance aerogenerator, by electric gate-controlled switch, be connected with the single-phase sine-converter circuit of the H bridge of modular power converters; The H bridge single-phase sine-converter circuit 8 of modular power converters is connected with bus positive pole by electric gate-controlled switch, is connected with bus negative pole by electric gate-controlled switch; The number of H bridge single-phase sine-converter circuit of modular power converters is identical with the number of the centralized power generation winding phase of fault-tolerance aerogenerator.
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| CN108204331B (en) * | 2016-12-19 | 2020-02-14 | 北京金风科创风电设备有限公司 | Fault processing method and device for wind generating set |
| CN107508514B (en) * | 2017-09-25 | 2018-10-19 | 湖南大学 | A kind of large-scale wind electricity unit unilateral magnetic force suppressing method and system |
| CN108233823B (en) * | 2018-01-23 | 2020-07-07 | 南京理工大学 | Fault-tolerant proportional coordination control method of multi-motor servo drive system under coupled control structure |
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| CN114142717B (en) * | 2021-12-03 | 2024-02-20 | 哈电风能有限公司 | Fault-tolerant operation control method for wind turbine generator and wind turbine generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105227015B (en) | 2017-10-17 |
| CN105281622B (en) | 2017-09-29 |
| CN103795313B (en) | 2016-04-13 |
| CN105281622A (en) | 2016-01-27 |
| CN103795313A (en) | 2014-05-14 |
| CN105298747B (en) | 2017-09-08 |
| CN105298747A (en) | 2016-02-03 |
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