CN102830357B - Test method and test platform for wind turbine generator set - Google Patents
Test method and test platform for wind turbine generator set Download PDFInfo
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- CN102830357B CN102830357B CN201210343033.7A CN201210343033A CN102830357B CN 102830357 B CN102830357 B CN 102830357B CN 201210343033 A CN201210343033 A CN 201210343033A CN 102830357 B CN102830357 B CN 102830357B
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Abstract
The embodiment of the invention discloses a test method for a wind turbine generator set, which comprises the following steps: obtaining a running stage of a to-be-simulated and tested wind turbine generator set, and then controlling a speed of a main motor and/or controlling a torque of a secondary motor according to the running stage of the to-be-simulated and tested wind turbine generator set, so as to simulate the change in wind speed and/or wind energy and test the wind turbine generator set. According to the embodiment of the invention, two motors which are in parallel connection and are in main and secondary control modes are arranged at a driving end, wherein the main motor is in a speed control mode; the secondary motor is in a torque control mode; and the speed of the main motor and/or the torque of the secondary motor are/is controlled according to the running stage of the to-be-simulated and tested wind turbine generator set, so as to simulate the change in wind speed and/or wind energy. The purpose of testing the wind turbine generator set by simulating different wind speeds and different loads is achieved and the problem of the prior art that a true working condition cannot be simulated for testing is solved.
Description
Technical field
The present invention relates to wind power generating set field tests, especially relate to a kind of method of testing and test platform of Wind turbines.
Background technology
In wind-power electricity generation, the factory inspection test of complete machine is the key link that can relation Wind turbines normally run.In the prior art, Wind turbines testing table is generally taked to carry out test and check to mode of dragging to Wind turbines.In the given reference velocity of drive end, drive tested unit by shaft coupling or gear case.General employing speeds control, carries out adaptive allocation moment at drive end, and tested unit loads equally simultaneously.
Inventor is realizing finding in process of the present invention, the particularly crucial ruuning situation being a bit whether to simulate as much as possible Wind turbines under actual wind regime when testing Wind turbines, as grid-connected in Wind turbines under different operating mode, power stage situation etc.Therefore, in order to test the performance characteristic of Wind turbines in different wind speed different loads situation, needing design experiment platform, and taking certain control method to test Wind turbines, for later technological improvement provides important reference frame.But this method of testing of the prior art can only the link such as grid-connected, the generating of Wind turbines simply below analog-driven end rated power, also cannot simulate the action of pitch-controlled system during wind regime change to the impact of Wind turbines output power.In other words, such loading effect just can check measurand can meet certain loading requirement, the definite value effect such as fully loaded can be reached, and possibility produced problem in inspection loading procedure, but the operational effect of tested end in actual wind regime and different phase can not be simulated truly, as the change of Wind turbines output power and the operating characteristic etc. of pitch-controlled system under different wind speed different loads situation.Visible, scheme of the prior art cannot be similar to carries out simulation test truly, cannot simulate the real working condition such as different wind speed different loads and test Wind turbines.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of method of testing and test platform of Wind turbines, tests Wind turbines to realize simulating different wind speed different loads.
The embodiment of the invention discloses a kind of method of testing of Wind turbines, it is characterized in that: for Wind turbines test platform; The drive end of described test platform is two motors in parallel; The tested end of described test platform is Wind turbines to be measured; Described drive end is connected by gear case with described tested end, and described gear case is that two-stage is parallel, dual input list export structure;
Described method comprises:
Step one: obtain want operation phase of the Wind turbines of simulation test;
Step 2: according to the operation phase of the Wind turbines of wanted simulation test, controls speed and/or the moment of described two motors respectively, realizes the test to described Wind turbines with the change of simulating wind speed and/or wind energy.
Preferably, described two motors takes master-slave control method to control, wherein main motor mainly adopts speed control method, Torque Control mode is adopted from motor, and described step 2 is specially: according to the operation phase of the Wind turbines of wanted simulation test, control the speed of described main motor respectively and/or control the described moment from motor, realizing the test to described Wind turbines with the change of simulating wind speed and/or wind energy.
Preferably, described step 2 specifically comprises:
When needs simulation test wind speed from above freezing be raised to incision this one-phase of wind speed time, the rotating speed controlling described main motor rises to default reference speed value.
Preferably, described step 2 specifically comprises:
When needs simulation test wind speed from incision wind speed rise but described Wind turbines not yet reach this one-phase of maximum speed time, control described main motor rotating speed rise, control simultaneously described drive end load sharing ratio rise.
Preferably, described step 2 specifically comprises:
When Wind turbines described in needs simulation test has reached maximum speed but its power not yet reaches this one-phase of output rating, the load sharing ratio controlling described drive end has risen.
Preferably, described method also comprises:
When Wind turbines described in needs simulation test has reached rated power, wind energy continues to increase this one-phase, the additional moment controlling described main motor rises, and reduces described in controlling from the additional moment of motor simultaneously.
The embodiment of the present invention also discloses a kind of test platform of Wind turbines, and described platform comprises:
Drive end: comprise two motors in parallel, the institute that described drive end is used for according to receiving wants the control command of the operation phase of the Wind turbines of simulation test, changes the speed of described two motors and/or moment to simulate the test of change realization to Wind turbines to be tested of wind speed and/or wind energy;
Gear case: for connecting described drive end and tested end, for two-stage is parallel, dual input list export structure, wherein said tested end is described Wind turbines to be tested
Preferably, described two motor take master-slave control method to control, wherein main motor mainly adopts speed control method, adopt Torque Control mode from motor, described drive end is by changing the speed of described main motor and/or changing the described moment from motor to realize the simulation to wind speed and/or wind energy change.
Drive end is set to the in parallel two motors taking master-slave control method by the embodiment of the present invention, wherein main motor adopts speed control method, Torque Control mode is adopted from motor, then according to the operation phase of the Wind turbines of wanted simulation test, control the speed of described main motor and/or control the described moment from motor, thus the change of wind speed and/or wind energy can be simulated, reach the simulation different wind speed different loads object of testing Wind turbines, overcoming in prior art can not the Reality simulation operating mode problem of testing.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the test platform schematic diagram that the embodiment of the present invention one method is applied;
Fig. 2 is the embodiment of the present invention one principal and subordinate motor moment output relation schematic diagram;
Fig. 3 is the process flow diagram of the embodiment of the present invention one method;
Fig. 4 is frequency converter logic control schematic diagram in the embodiment of the present invention one;
Fig. 5 is that the embodiment of the present invention one tests Wind turbines change oar regulable control schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
First the basic condition of the test platform used for the present embodiment method is introduced.The test platform schematic diagram that Fig. 1 applies for the embodiment of the present invention one method.The drive end of described test platform is the in parallel two motors taking master-slave control method, and wherein main motor mainly adopts speed control method, adopts Torque Control mode from motor; The tested end of described test platform is Wind turbines to be measured; Described drive end is connected by gear case with described tested end, and described gear case is that two-stage is parallel, dual input list export structure.
Preferably, frequency converter specifically can be adopted in the present embodiment to control drive end.Shown in Figure 1, frequency converter Converter is used for controlling active motor M aster and slave motor Follower, and frequency converter Converter and tested Wind turbines Wind Turbine is all connected to electrical network Grid by transformer Transformer.Frequency converter Converter is AC converter, comprises rectifier ARU and two inverter (INU1, INU2), one drag two structure.Adopt the mode of two asynchronous motors parallel connections at drive end, obviously need meet following relation: P
drive> P
generator, P
drivefor the maximum output general power of drive end, P
generatorfor the peak power output of tested end and Wind turbines.Tested end and tested Wind turbines, in the present embodiment for variable speed constant frequency doubly-fed type blower fan.
Two motor in parallel are as prime mover in the present embodiment, input shaft is engaged on a gear respectively, and genus is rigidly connected, therefore takes master-slave control method to two motors, main motor Master mainly adopts speeds control, adopts Torque Control from motor Follower.
Fig. 2 is principal and subordinate's motor moment output relation schematic diagram.Adopt Torque Control from motor Follower, its moment exports the compensation exported as main motor Master moment.In fig. 2, T
ffor the moment that slave motor exports, T
mfor the moment that active motor exports, T
gfor being carried in the moment on Wind turbines.Then have:
Wherein η is transmission efficiency, N
1/ N
2for drive end and tested end ratio of gear, suppose that principal and subordinate's motor connects the number of gears here consistent, N
1/ N
2constant is, visible T with η
gchange by T
mand T
fdetermine.
Shown in Figure 3, described in the present embodiment, method comprises:
S301: obtain want operation phase of the Wind turbines of simulation test.With can only simulate compared with single operating mode in prior art, the method of the present embodiment can simulate multiple operation phase of Wind turbines, the stage being raised to incision wind speed from above freezing as: wind speed, wind speed from incision wind speed continue to rise but as described in Wind turbines not yet reaches stage of maximum speed, Wind turbines has reached maximum speed but its power not yet reaches stage of output rating, Wind turbines has reached rated power and wind energy continues stage of increasing, etc.Therefore before carrying out simulation test, first to obtain the operation phase of the Wind turbines of wanted simulation test, after the operation phase of Wind turbines determining wanted simulation test, just can carry out corresponding simulation test.
S302: according to the operation phase of the Wind turbines of wanted simulation test, controls the speed of described main motor and/or controls the described moment from motor, realizing the test to described Wind turbines with the change of simulating wind speed and/or wind energy.Inventor is realizing finding in process of the present invention, can be summed up as the simulation to wind speed and wind energy two parameters to the test of each operation phase of Wind turbines.And the speed controlling main motor can simulate wind speed, control can simulate wind energy from the moment of motor, the two is independent or be combined the multiple operation phase just can simulating Wind turbines flexibly, thus achieves the object of the present embodiment.
Fig. 4 is frequency converter logic control schematic diagram in the present embodiment.In test platform, make the speed V of main motor
mfor given reference velocity V
ref, then draw motor values for actual speed V by mair motor encoder feedback signal
act.V
mand V
actdifference as the input of frequency convertor PID.Corresponding main motor output torque value T is drawn after PID arithmetic is carried out in frequency converter inside
mout.Scale is load sharing ratio, can be specified by control system or controller and send frequency converter relevant parameter to.T
moutthe output torque T from motor is obtained after being multiplied with Scale
fout.In other embodiments of the present invention, T
moutand T
foutcan be used as T
mand T
fdirect output, but in the present embodiment, in order to realize, to the simulation test becoming oar, so preferably, also setting up T
maddand T
fadd, shown in Figure 4.T
maddand T
faddrespectively from the additional moment value of control system or controller, their value determines according to testing requirements and control strategy, and sends frequency converter to by testing table master control system, to realize T
mand T
fadjustment.T
maddwith T
moutsuperpose, composition T
mexport; T
faddwith T
foutsuperpose, namely according to T
mt is calculated with Scale
foutafter, T
faddagain with T
foutcomposition T
fexport.Then there is following relation formula:
T
m＝T
Mout+T
Madd
T
f＝T
Fout+T
Fadd
T
Fout＝(T
Mout+T
Madd)×Scale
Drive end reference velocity V
ref(Speed Reference) and reference moment T '
ref(TorqueReference) wind speed corresponding under the different wind regime that can be calculated by BLADED software and moment.Learnt by Fig. 2:
For convenience of calculating, suppose to think that ratio of gear and transmission efficiency are 1, then above-mentioned formula can be reduced to: T
g=(T
m+ T
f).Drive end is master & slave control, and main motor Master adopts speeds control, adopts Torque Control, and meet V from motor Follower
m=V
ref, T
ref=T
m+ T
f.T
reffor wind power generating set reach rated power before (comprising rated power) corresponding loading moment, now T
ref=T '
ref.
Illustrate below and specifically how each operation phase simulated in the present embodiment:
Example 1: the operation phase of the described Wind turbines according to wanted simulation test, controls the speed of described main motor and/or controls the described step from the moment of motor, specifically can comprise:
When needs simulation test wind speed from above freezing be raised to incision this one-phase of wind speed time, the rotating speed controlling described main motor rises to default reference speed value.
In actual condition, in this stage, wind speed is raised to incision wind speed from above freezing.Drive end is when simulating this process, and corresponding process is that the rotating speed of initiatively motor is raised to default reference speed value V from above freezing
ref.Namely drive end is loaded, make V
mrise to V
m=V
ref.When simulating wind speed and being more than or equal to incision wind speed, tested end wind power generation set grid-connection.
Example 2: the operation phase of the described Wind turbines according to wanted simulation test, controls the speed of described main motor and/or controls the described step from the moment of motor, specifically comprising:
When needs simulation test wind speed from incision wind speed rise but described Wind turbines not yet reach this one-phase of maximum speed time, control described main motor rotating speed rise, control simultaneously described drive end load sharing ratio rise.
This stage and wind turbine generator maximum wind energy tracing Area, operate in generator maximum speed after wind power generation set grid-connection with lower area, wind power generating set paddle pitch angle is constant.The output power of wind-power electricity generation arbor is only relevant with the rotating speed of generator, now, controls the output power of generator, makes it operate in peak power curve, realize maximal wind-power tracking.For simulation actual condition, make V
mcontinue to increase, start to increase Scale value simultaneously and make T
falso increase, make wind power generating set be operated in maximal power point tracking district.
Example 3: the operation phase of the described Wind turbines according to wanted simulation test, controls the speed of described main motor and/or controls the described step from the moment of motor, specifically comprising:
When Wind turbines described in needs simulation test has reached maximum speed but its power not yet reaches this one-phase of output rating, the load sharing ratio controlling described drive end has risen.
This stage and Wind turbines Heng Zhuansuqu, wind power generating set rotating speed reaches maximum speed, but wind power generating set output power does not also reach output rating.For the not overspeed of protection wind power generating set, wind power generating set should be made to run at maximum permissible speed.For simulation actual condition, make V
mremaining unchanged, is still rotating speed under actual condition, but increases the value of Scale, thus makes wind power generating set output power continue to increase.
Example 4: described method also comprises:
When Wind turbines described in needs simulation test has reached rated power, wind energy continues to increase this one-phase, the additional moment controlling described main motor rises, and reduces described in controlling from the additional moment of motor simultaneously.
This stage and Wind turbines invariable power district.Along with the continuation of wind energy increases, wind power generating set output power will be increased to output rating.If but wind energy still continues to increase, be protection wind power generating set, then require that now wind power generating set is operated in constant speed invariable power state.In this case, wind power generating set realizes the power limitation control of unit by variable pitch control.
Fig. 5 is that the embodiment of the present invention one tests Wind turbines change oar regulable control schematic diagram.Formula F (γ, ν, Δ ω) represents that the blade of wind speed ν under a certain operating mode, radius γ is when needs become oar expected angle Δ ω, absorbs or the variable quantity of drive end moment that the wind energy energy of release is corresponding.Wherein: γ is wind power generation unit blade radius; ν is the wind speed under a certain operating mode; Δ ω is that the expectation of blade becomes propeller angle.In the present embodiment, F (γ, ν, Δ ω) is considered as given value, can gets.
In this stage, wind energy continues to increase, but Wind turbines reaches rated power, and rotating speed can not raise again, therefore needs to discharge unnecessary energy by becoming oar.When simulating this stage, the moment rising by controlling described main motor in the present embodiment is simulated wind energy and is continued to increase, and controls the reduction of the described moment from motor simultaneously and simulates by becoming oar release excess energy.The T that the present embodiment is set up
maddand T
fadd, just in order to complete this effect, shown in Figure 4.T
maddand T
faddrespectively from the additional moment value of control system, their value determines according to testing requirements and control strategy, and sends frequency converter to by testing table master control system, to realize T
mand T
fadjustment.
Concrete, continue to increase lower Wind turbines running status, T for simulating actual wind energy
ref=T
m+ T
f, when regulation Tf is Wind turbines rated power, load maximum moment T from motor
f-Max, T
reffor drive end during Wind turbines rated power is given with reference to moment values.Now require T
refremain unchanged, and make T
m↑, due to T
m=T
mout+ T
madd, visible T
m↑ by adjustment T
madd↑ change realize, thus can simulate wind energy increase.In this case, wind power generating set realizes the power limitation control of unit by variable pitch control, namely should have T simultaneously
f↓.Represent that Wind turbines becomes the variable quantity of drive end moment corresponding to wind energy energy that oar will discharge, so T by known F (γ, ν, Δ ω) above
mthe amount that should reduce is F (γ, ν, Δ ω), i.e. T
fadd-F (γ, ν, Δ ω) should be equaled.That is T
f=T
f-Max+ T
fadd, T
fadd=-F (γ, ν, Δ ω).
Visible in example 4, pass through T
maddand T
faddcan realize T
mand T
fthe i.e. adjustment of the moment of main motor and the moment from motor.And in other embodiments of the present invention, can also be realized by various existing method to main motor moment with from the adjustment of motor moment, this embodiment of the present invention is repeated no more.
Embodiment two
The present embodiment is the concrete equipment that a upper embodiment method is applied, i.e. a kind of test platform of Wind turbines.Described platform comprises:
Drive end: comprise the in parallel two motors taking master-slave control method, wherein main motor adopts speed control method, Torque Control mode is adopted from motor, described drive end be used for according to receive want the control command of the operation phase of the Wind turbines of simulation test, change the speed of described main motor and/or change the described moment from motor, realizing the test to Wind turbines to be tested with the change of simulating wind speed and/or wind energy;
Gear case: for connecting described drive end and tested end, for two-stage is parallel, dual input list export structure, wherein said tested end is described Wind turbines to be tested.
For apparatus embodiments, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Apparatus embodiments described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
It should be noted that, although what provide in embodiment one and embodiment two is all that two motors adopt master-slave control method to control, and main motor mainly adopts speed control method, Torque Control mode is adopted from motor, but those of ordinary skill in the art obviously can understand under the inspiration of technical solution of the present invention, realize the simulation to wind speed and/or wind energy change, the multiple electric motors of more than two can be adopted; Even if adopt two its concrete control modes of motor also can be different from the mode provided in the embodiment of the present invention simultaneously.
One of ordinary skill in the art will appreciate that all or part of step realized in said method embodiment is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM, RAM, magnetic disc, CD etc.
Also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Apply specific case herein to have carried out lock to principle of the present invention and embodiment and state, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (6)
1. a method of testing for Wind turbines, is characterized in that: for Wind turbines test platform; The drive end of described test platform is two motors in parallel; The tested end of described test platform is Wind turbines to be measured; Described drive end is connected by gear case with described tested end, and described gear case is that two-stage is parallel, dual input list export structure;
Described method comprises:
Step one: obtain want operation phase of the Wind turbines of simulation test;
Step 2: according to the operation phase of the Wind turbines of wanted simulation test, controls speed and/or the moment of described two motors respectively, realizes the test to described Wind turbines with the change of simulating wind speed and/or wind energy;
Wherein, described two motors takes master-slave control method to control, wherein main motor mainly adopts speed control method, Torque Control mode is adopted from motor, and described step 2 is specially: according to the operation phase of the Wind turbines of wanted simulation test, control the speed of described main motor respectively and/or control the described moment from motor, realizing the test to described Wind turbines with the change of simulating wind speed and/or wind energy.
2. method according to claim 1, is characterized in that, described step 2 specifically comprises:
When needs simulation test wind speed from above freezing be raised to incision this one-phase of wind speed time, the rotating speed controlling described main motor rises to default reference speed value.
3. method according to claim 1, is characterized in that, described step 2 specifically comprises:
When needs simulation test wind speed from incision wind speed rise but described Wind turbines not yet reach this one-phase of maximum speed time, control described main motor rotating speed rise, control simultaneously described drive end load sharing ratio rise.
4. method according to claim 1, is characterized in that, described step 2 specifically comprises:
When Wind turbines described in needs simulation test has reached maximum speed but its power not yet reaches this one-phase of output rating, the load sharing ratio controlling described drive end has risen.
5. method according to claim 1, is characterized in that, described method also comprises:
When Wind turbines described in needs simulation test has reached rated power, wind energy continues to increase this one-phase, the additional moment controlling described main motor rises, and reduces described in controlling from the additional moment of motor simultaneously.
6. a test platform for Wind turbines, is characterized in that, described platform comprises:
Drive end: comprise two motors in parallel, the institute that described drive end is used for according to receiving wants the control command of the operation phase of the Wind turbines of simulation test, changes the speed of described two motors and/or moment to simulate the test of change realization to Wind turbines to be tested of wind speed and/or wind energy;
Gear case: for connecting described drive end and tested end, for two-stage is parallel, dual input list export structure, wherein said tested end is described Wind turbines to be tested;
Wherein, described two motor take master-slave control method to control, wherein main motor mainly adopts speed control method, adopt Torque Control mode from motor, described drive end is by changing the speed of described main motor and/or changing the described moment from motor to realize the simulation to wind speed and/or wind energy change.
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| CN112406558B (en) * | 2020-11-26 | 2022-07-12 | 天津易鼎丰动力科技有限公司 | Optimal control method for double-motor efficiency of electric automobile |
| CN113009905A (en) * | 2021-03-04 | 2021-06-22 | 湖南工程学院 | Fan simulation test system with multi-motor architecture |
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| CN101054951A (en) * | 2007-05-24 | 2007-10-17 | 上海交通大学 | Large scale wind power machine control method based on maximum energy capture |
| EP2003461A1 (en) * | 2007-05-25 | 2008-12-17 | Schneider Toshiba Inverter Europe SAS | Method for detecting the loss of one or more phases in a permanent-magnet synchronous electric motor |
| CN201527465U (en) * | 2009-11-17 | 2010-07-14 | 沈阳锐昌机电有限公司 | Simulated experiment bench for doubly fed type generator |
| CN201697785U (en) * | 2010-06-09 | 2011-01-05 | 华锐风电科技(集团)股份有限公司 | Complete high-power wind generating set experiment table |
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| US8358095B2 (en) * | 2009-07-31 | 2013-01-22 | GM Global Technology Operations LLC | Method and system for testing electric motors |
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|---|---|---|---|---|
| CN101054951A (en) * | 2007-05-24 | 2007-10-17 | 上海交通大学 | Large scale wind power machine control method based on maximum energy capture |
| EP2003461A1 (en) * | 2007-05-25 | 2008-12-17 | Schneider Toshiba Inverter Europe SAS | Method for detecting the loss of one or more phases in a permanent-magnet synchronous electric motor |
| CN201527465U (en) * | 2009-11-17 | 2010-07-14 | 沈阳锐昌机电有限公司 | Simulated experiment bench for doubly fed type generator |
| CN201697785U (en) * | 2010-06-09 | 2011-01-05 | 华锐风电科技(集团)股份有限公司 | Complete high-power wind generating set experiment table |
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