CN103277253A - Vertical-shaft wind turbine rotary spindle vibration restraining method which is high in wind energy capturing efficiency - Google Patents
Vertical-shaft wind turbine rotary spindle vibration restraining method which is high in wind energy capturing efficiency Download PDFInfo
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Abstract
本发明公开了一种高风能捕获效率的垂直轴风力机旋转主轴振颤抑制方法，实时获取旋转主轴的垂直倾角；计算旋转主轴在其水平截面内正交的两个方向上的振颤烈度、风力发电机最大功率跟踪目标下的最优转速；确定期望转速；由转速内环控制器驱使转速快速达到期望转速；当主轴的振颤烈度超过预先设定的最大安全调控阈值时，启动转速内环控制器的反向电动制动功能，以及旋转主轴的电磁抱刹机构；转速内环控制器的快速转速调节方式为直接切断部分相绕组励磁的发电机升速方法或放开电流斩波限的发电机降速方法。本发明可实时测算出主轴的当前振颤烈度，抑制主轴振颤，使得风力机在保持机械稳定的同时，尽可能地获得最高的风能捕获效率。
The invention discloses a method for suppressing vibration of a rotating main shaft of a vertical axis wind turbine with high wind energy capture efficiency, which obtains the vertical inclination angle of the rotating main shaft in real time; calculates the vibration intensity of the rotating main shaft in two orthogonal directions in its horizontal section, The optimal speed under the maximum power tracking target of the wind turbine; determine the desired speed; the speed is driven by the speed inner loop controller to quickly reach the desired speed; The reverse electric braking function of the loop controller, and the electromagnetic brake mechanism of the rotating spindle; the fast speed adjustment method of the speed inner loop controller is the generator speed-up method that directly cuts off part of the phase winding excitation or releases the current chopping limit. Generator deceleration method. The present invention can measure and calculate the current vibration intensity of the main shaft in real time, suppress the vibration of the main shaft, and make the wind turbine obtain the highest wind energy capture efficiency as much as possible while maintaining mechanical stability.
Description
The application is application number: 201210049193.0, and the applying date: 2012.2.29, the dividing an application of title " electromechanics of vertical-shaft wind machine rotating main chatter is coordinated inhibition method and device ".
Technical field
The present invention relates to a kind of electromechanical integration control field of wind power generating set, the electromechanics that is specifically related to a kind of vertical-shaft wind machine rotating main chatter is coordinated intelligence inhibition method and apparatus.
Background technique
Vertical axis windmill has been set up the tentative wind field except minority area in the world, the large-scale popularization not still at present, but its superior aerodynamic performance more and more causes various countries researcher's attention.
From a structural point, the vertical rotary main shaft structure of vertical axis windmill belongs to the mast structure in the tall and slender structure.Because the main feature of tall and slender structure is highly higher gentleer with rigidity substantially horizontal, so horizontal loading can cause bigger structural response.In addition, in order further to improve the wind energy utilization of vertical axis aerogenerator, the wind-collection cover that can box haul rotates from navigation is installed in the vertical axis windmill whole body outside of being everlasting, be that windward side installs air gathering plate additional, side installs the navigation empennage additional with the wind, as " the vertical axis type wind machine " of the woods Yanshan Mountain in patent CN2086318U proposition, " vertical shaft wind-driven generator is the wind-gathering device of navigation certainly " that people such as Wu Guoqing propose at patent CN101649809, " the once-through type windmills " that people such as ground swell Hiro machine propose at patent TOHKEMY 2007-16661A etc. have improved the flexibility of vertical axis windmill further.
Therefore, under the randomness acting in conjunction of the high flexibility of mechanical structure and wind load, the vertical axis windmill main shaft is responsive especially to wind action, and the normal wind effect that forms has: the down wind vibratory response of structure, the beam wind of structure are to forms such as vortex-induced vibration, self-excited vibration, parametric vibrations.And the complexity of complete machine structure and installation environment causes the accurate measuring and calculating of these wind effect natural frequencys difficult unusually again.
On the other hand, on mechanistic angle, vertical rotary main shaft belongs to rotor-support-foundation system, and its rotating speed is associated with the aeroelasticity characteristic that wind-driven generator electrical load power and wind energy conversion system wind energy absorb.On engineering is used, in order to obtain the wind energy absorption efficiency of wind energy conversion system maximum, wind-driven generator often adopts speed closed loop control, according to the rotating speed of the real-time regulator generator of current wind speed, so that the wheel speed that the vertical rotary main shaft of wind energy conversion system drives and theoretic maximal wind-energy capture rotating speed are complementary.
For this reason, utilize " wind-driven generator speed closed loop controller can be regulated the rotating speed of vertical rotary main shaft effectively " this basic skills, some scholars are at the self-vibration problem of horizontal axis wind-driven generator group pylon, proposed to adopt simply the means of " reducing the wind energy conversion system rotating speed " to suppress the control strategy of phenomenon, " wind power plant and the control its method " that " resonance of wind-power electricity generation pylon is the restraining device initiatively " that proposes at patent CN201661421U as people such as winter thunders, Alois fertile this (moral) propose at patent CN1270080C etc.
But the method for existing " utilizing the means that reduce the wind energy conversion system rotating speed to suppress the free vibration of pylon " is too conservative, this method has reduced the wind energy capture rate of wind energy conversion system, even makes wind energy conversion system can't reach the maximal wind-energy capture rotating speed under some wind speed operating mode all the time.And theory analysis and tunnel test show, when a certain wind speed excites vertical rotary main shaft generation self-vibration, improve the chattering that all can suppress vertical rotary main shaft with the rotating speed that reduces wind-driven generator.
In addition, different with the self-vibration inhibition principle of horizontal axis wind-driven generator group pylon, the reason of vertical-shaft wind machine rotating main chatter is more various, and the natural frequency self-vibration is not only arranged, in addition reasons such as other wind effect and mechanical main shaft off-centre.Therefore, be necessary the inhibition method of a kind of vertical-shaft wind machine rotating main of research and design chatter, utilize the active quick adjustment mode of wind-driven generator rotating speed, comprise promptly raising or reduction wind energy conversion system rotating speed, with stability and the efficient that improves this type of wind-power generating system work.
Summary of the invention
The object of the present invention is to provide a kind of current chatter earthquake intensity that can calculate main shaft in real time, suppress the main shaft chatter, make wind energy conversion system when keeping mechanically stable, obtain the vertical-shaft wind machine rotating main chatter inhibition method of the highest high wind energy capture rate as much as possible.
Technical solution of the present invention is:
A kind of vertical-shaft wind machine rotating main chatter inhibition method of high wind energy capture rate is characterized in that: may further comprise the steps:
(1) obtain the vertical dip angle of rotary main shaft in real time, described vertical dip angle comprises inclination drift angle value α x and the α y on the both direction of quadrature in the main shaft horizontal section;
(2) the chatter earthquake intensity K of calculating rotary main shaft
v, described chatter earthquake intensity is defined as,
(3) according to current wind speed, calculate the optimized rotating speed ω under the wind-driven generator peak output tracking target
Op
(4) according to the earthquake intensity of rotary main shaft chatter, analyze the expectation rotational speed omega of determining wind-driven generator
g:
A) obtain the current rotational speed omega of wind-driven generator
c
B) whether the chatter earthquake intensity of judging rotary main shaft surpasses predefined critical regulation and control threshold k t,
If enter step d);
If not, enter step c);
C) with optimized rotating speed ω
OpBe defined as the expectation rotational speed omega of wind-driven generator
g
D) more current rotational speed omega
cWith optimized rotating speed ω
OpSize,
If | ω
c-ω
Op| ε, then with optimized rotating speed ω
OpBe defined as the expectation rotational speed omega of wind-driven generator
g
If | ω
c-ω
Op|≤ε, then with the expectation rotational speed omega of wind-driven generator
gBe set at and be lower than optimized rotating speed ω
Op
In the formula, ε is arithmetic number, is the current rotational speed omega of representative
cWith optimized rotating speed ω
OpA numerical quantities of difference;
(5) rotating speed that orders about wind-driven generator by ring controller in the rotating speed reaches the expectation rotational speed omega fast
g
(6) whether the chatter earthquake intensity of judging rotary main shaft is regulated and control in the threshold k s above predefined maximum safety,
If enter step (7);
If not, return step (1);
(7) the reverse electrodynamic braking function of wind-driven generator of ring controller in the startup rotating speed, and the electromagnetism brake holding mechanism of rotary main shaft descends the rotating speed of wind-driven generator fast;
(8) send the disorderly closedown signal, and wait for the instruction of restarting that resets.
In the described step 10): obtain vertical tilt drift angle value α x and α y by the diaxon dip sensor is installed on the static part on rotary main shaft top.
Described wind-driven generator is the switching magnetic-resistance wind-driven generator.
The quick rotational speed regulation mode of ring controller is the generator raising speed method of direct cutout portion phase winding excitation or the generator reduction of speed method of decontroling the current chopping limit in step (5) medium speed.
A kind of electromechanics of vertical-shaft wind machine rotating main chatter is coordinated the isolated plant of inhibition method, it is characterized in that: comprise at least:
The diaxon dip sensor is installed on the static part on rotary main shaft top, for inclination drift angle value α x and the α y on the both direction that obtains quadrature in the rotary main shaft horizontal section;
Speed probe is installed on the fuselage of wind-driven generator, is used for obtaining the current rotational speed omega of wind-driven generator
c
Air velocity transducer is installed on the working site of vertical axis wind electric unit, is used for obtaining on-the-spot wind speed;
Wind-driven generator with the coaxial installation of vertical-shaft wind machine rotating main, is used for the rotating speed of energy converting between mechanical and adjusting vertical axis windmill;
Electromagnetism brake holding mechanism with the coaxial installation of vertical-shaft wind machine rotating main, is used for stoping the rotation of vertical axis windmill;
Ring controller in the rotating speed is used for the rotating speed of control wind-driven generator, the expectation rotational speed omega that provides according to outer ring controller
g, and speed probe detects the current rotational speed omega that obtains
c, use the speed closed loop control algorithm that comprises generated output control, reverse electrodynamic braking technology, make the rotating speed of wind-driven generator arrive the expectation rotational speed omega fast
g
The outer ring controller of dynamo-electric coordination is used for receiving in real time diaxon dip sensor, air velocity transducer, signals of rotational speed sensor, and thus, calculates the vibration severity of rotary main shaft, the optimized rotating speed ω under the maximal power tracing target
Op, the chatter earthquake intensity of judgement rotary main shaft is determined the expectation rotational speed omega of wind-driven generator with respect to the strong and weak degree of critical regulation and control threshold value and maximum safety regulation and control threshold value
g, oppositely electrodynamic braking instruction, electromagnetism brake holding instruction and shutdown, reset signal.
Described wind-driven generator is the switching magnetic-resistance wind-driven generator.
Compared with prior art the invention has the advantages that:
(1) adopt the diaxon dip sensor as Detecting element, the chatter earthquake intensity of measuring and calculating main shaft in real time, thereby: (a) need not to know in advance vertical-shaft wind machine rotating main intrinsic natural frequency of vibration value accurately, the only judgement by current chatter earthquake intensity value size, can determine main shaft and whether be in self-oscillating regime, i.e. the detection of main shaft self-oscillating regime is accurate, reliable, self adaption is good; (b) this chatter earthquake intensity value, can reflect not only whether main shaft has the generation self-vibration, can reflect also whether main shaft main shaft unstable states such as other wind effects, machinery rotation off-centre, main shaft perpendicularity deviation are excessive have taken place, and namely the differentiation in main shaft chatter source is various, accurate.
(2) according to the chatter earthquake intensity of vertical rotary main shaft, the optimized rotating speed under the wind-driven generator peak output tracking target, and the current rotating speed of wind-driven generator, determine the expectation rotating speed of wind-driven generator, with inhibition main shaft chatter.This expectation tachometer value is formulated science, reasonable, can make wind energy conversion system when keeping mechanically stable, obtains the highest wind energy capture rate as much as possible.
(3) adopt the dynamo-electric method for controlling number of revolution of coordinating, comprise the reverse electrodynamic braking of generator and electromagnetism brake holding, the wind energy conversion system rotating speed is regulated.It is fast to have governing speed, advantage such as high working efficiency, real-time are good.Especially adopt the reverse electrodynamic braking method of switching magnetic-resistance wind-driven generator, its just/negative generation of torque only with the angle of flow under the lifting/lowering interval of phase inductance relevant, the adjusting of level of torque is only closed with the copped wave existence of phase current, therefore, and the oppositely level and smooth easily control of electrodynamic braking torque.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 coordinates inhibition method embodiment's flow chart for the electromechanics of vertical-shaft wind machine rotating main chatter of the present invention.
Fig. 2 is the example flow chart of analyzing the expectation rotating speed of determining wind-driven generator among Fig. 1.
Fig. 3 coordinates the structural representation of restraining device for the electromechanics of vertical-shaft wind machine rotating main chatter of the present invention.
Fig. 4 coordinates the control Block Diagram of restraining device for the electromechanics of vertical-shaft wind machine rotating main chatter of the present invention.
Embodiment
With reference to figure 1, this figure is the flow chart that the electromechanics of vertical-shaft wind machine rotating main chatter of the present invention is coordinated inhibition method embodiment.This embodiment may further comprise the steps:
S100, beginning.
S110, obtain the vertical dip angle of rotary main shaft in real time.
Described vertical dip angle comprises the inclination drift angle value α on the both direction of quadrature in the main shaft horizontal section
xAnd α
yThis inclination drift angle value can be obtained by the diaxon dip sensor is installed on the static part on rotary main shaft top.
The chatter earthquake intensity K of S120, calculating rotary main shaft
v
Described chatter earthquake intensity is defined as,
By above-mentioned calculating formula as can be known, chatter earthquake intensity K
vValue comprised rotary main shaft in the horizontal section inclination amount (square root of the quadratic sum of inclination drift angle value α x and α y,
), pitch velocity (square root of the quadratic sum of inclination drift angle value α x and α y first derivative,
) and tilt acceleration (square root of the quadratic sum of inclination drift angle value α x and α y second dervative,
) etc. quantity of information, can reflect static state and dynamic duty feature that rotary main shaft is real-time, comprise whether main shaft the vibration of self-vibration, down wind, beam wind has taken place to vortex-induced vibration, revolution eccentric degree, perpendicularity static deviation degree etc.
S130, according to current wind speed, calculate the optimized rotating speed ω under the wind-driven generator peak output tracking target
Op
Characteristic parameter C by wind energy conversion system
p(λ β), according to current wind speed, can go out (comprising the interpolation etc. of tabling look-up) the optimized rotating speed tracking power P of wind-driven generator in line computation
Max-ω
Op, wind energy conversion system is at this optimized rotating speed ω
OpFollowing operation can absorb wind energy to greatest extent.
S140, according to the earthquake intensity of rotary main shaft chatter, analyze to determine the expectation rotational speed omega of wind-driven generator
g
S150, the rotating speed that orders about wind-driven generator by ring controller in the rotating speed reach the expectation rotational speed omega fast
g
The rotational speed regulation algorithm of ring controller needs to design according to the type of wind-driven generator in the rotating speed.The present invention selects the switching magnetic-resistance wind-driven generator for use, therefore, by the control principle of switching magnetic-resistance wind-driven generator as can be known, ring controller can adopt the APC control of transferring the field switch angle, the CCC control of transferring the field current limit in the rotating speed, the conventional methods such as voltage pwm control of transferring excitation intensity order about the turn up of wind-driven generator to the expectation rotational speed omega
gEspecially, in order to regulate the rotating speed of heterogeneous switching magnetic-resistance wind-driven generator more quickly, the present invention has designed the generator raising speed method that adopts direct cutout portion phase winding excitation (after cutting off phase winding, corresponding phase excitation-free current, namely can not produce negative torque, mechanical energy can't be converted to electric energy, therefore, generator can be in quick raising speed under the drive of wind energy conversion system) and (after the current chopping limit decontroled, field current sharply increased, and negative torque also becomes a square doubly increase to decontrol the generator reduction of speed method of current chopping limit, mechanical energy is converted to electric energy in a large number, therefore, generator drives the quick reduction of speed of wind energy conversion system), these two kinds of unconventional speed regulating methods.
S160, judge that whether the chatter earthquake intensity of rotary main shaft surpasses in the predefined maximum safety regulation and control threshold k s,
If enter step S170;
If not, return step S110;
The reverse electrodynamic braking function of wind-driven generator of ring controller in S170, the startup rotating speed, and the electromagnetism brake holding mechanism of rotary main shaft descend the rotating speed of wind-driven generator fast.
The purpose of this step is quick reduction of speed, to guarantee the mechanical stability of vertical wind energy conversion system, the present invention is considering under efficient and the reliable factor, adopt the dynamo-electric method for controlling number of revolution of coordinating: mechanical aspects, electromagnetism brake holding mechanism exerts oneself greatly, reliable operation, also can regulate the negative resistance moment size of its brake holding easily by the voltage pwm control mode; Electric aspect, the reverse electrodynamic braking state of switching magnetic-resistance wind-driven generator can produce the torque of negative resistance power effectively and quickly, and by such as APC control, CCC control and voltage pwm control mode, makes negative resistance power torque soft readjustment.
Especially, by the basic running principle of switched reluctance machines as can be known, the switching magnetic-resistance wind-driven generator is in electronic attitude or generating attitude, only relevant in rising or the last transition of phase inductance with phase winding conducting angular interval, can be under the condition that does not change power inverter and control circuit, operate in generating attitude or reverse electronic attitude (producing negative torque) by control algorithm easy to adjustly, and the adjusting of negative level of torque is only closed with the phase current copped wave existence that controller provides, therefore, the level and smooth easily control of the reverse electrodynamic braking torque adjustment process of switching magnetic-resistance wind-driven generator has tangible function and regulation and control advantage than the wind-driven generator of other types.
S180, transmission disorderly closedown signal, and wait for the instruction of restarting that resets.
The chatter earthquake intensity that rotary main shaft has taken place in this disorderly closedown signal representative has surpassed predefined maximum this event of safety regulation and control threshold value.The instruction of restarting that resets can be provided by outside manual operation, also can confirm that the wind energy conversion system main shaft is under the situation of steady state, restarts automatically by system delay after a period of time.
In the present embodiment, according to the chatter earthquake intensity of vertical rotary main shaft, the optimized rotating speed ω under the wind-driven generator peak output tracking target
Op, and the current rotational speed omega of wind-driven generator
c, determine the expectation rotational speed omega of wind-driven generator
g, its purpose namely is that the way of rotating speed by the control wind-driven generator suppresses the main shaft chatter, makes wind energy conversion system when keeping mechanically stable, obtains the highest wind energy capture rate as much as possible.Specific as follows described.
With reference to figure 2, this figure analyzes the expectation rotational speed omega of determining wind-driven generator among Fig. 1
gExample flow chart.It may further comprise the steps:
S141, obtain the current rotational speed omega of wind-driven generator
c
Current rotational speed omega
cCan be obtained by the speed probe detection that is installed in the wind power generator rotor rotating shaft.
S142, judge that whether the chatter earthquake intensity of rotary main shaft surpasses predefined critical regulation and control threshold k t,
If enter step S143;
If not, enter step S144;
S144, with the expectation rotational speed omega of wind-driven generator
gBe set at optimized rotating speed ω
Op, i.e. ω
g← ω
Op
S143, more current rotational speed omega
cWith optimized rotating speed ω
OpSize,
If | ω
c-ω
Op| ε, current rotational speed omega shown
cWith optimized rotating speed ω
OpDiffer bigger, then with optimized rotating speed ω
OpBe defined as the expectation rotational speed omega of wind-driven generator
g, i.e. ω
g← ω
Op
If | ω
c-ω
Op|≤ε shows current rotational speed omega
cWith optimized rotating speed ω
OpBe more or less the same, approach equate, then with the expectation rotational speed omega of wind-driven generator
gBe set at and be lower than optimized rotating speed ω
Op, i.e. ω
g＜ω
Op
In the formula, ε is arithmetic number, is the current rotational speed omega of representative
cWith optimized rotating speed ω
OpA numerical quantities of difference.
By above intelligent online analysis decision process, can determine under the current state expectation rotational speed omega of wind-driven generator this moment
gValue (this ω
gValue can greater than, equal and less than current rotational speed omega
cValue).Again with this expectation rotational speed omega
gValue is incorporated into the given input end of ring controller in the rotating speed, can reach the purpose that suppresses the main shaft chatter by the means that change the wind energy conversion system rotating speed.
Below the electromechanics of vertical-shaft wind machine rotating main chatter of the present invention being coordinated intelligent restraining device describes.
With reference to figure 3 and Fig. 4, the electromechanics of vertical-shaft wind machine rotating main chatter is coordinated restraining device and is comprised: diaxon dip sensor 1 and 2, be installed on the static part 11 on rotary main shaft 3 tops, for inclination drift angle value α x and the α y on the both direction that obtains quadrature in the rotary main shaft horizontal section; Speed probe 7 is installed on the fuselage of wind-driven generator 6, is used for obtaining the current rotational speed omega of wind-driven generator 6
c Air velocity transducer 10 is installed on the working site of vertical axis wind electric unit, is used for obtaining on-the-spot wind speed; Wind-driven generator 6 with the 3 coaxial installations of vertical axis windmill 4 rotary main shafts, is used for regulating the rotating speed of vertical axis windmill 4; Electromagnetism brake holding mechanism 5 with the 3 coaxial installations of vertical axis windmill 4 rotary main shafts, is used for stoping the rotation of vertical axis windmill 4;
Ring controller 8 in the rotating speed is used for the rotating speed of control wind-driven generator 6, the expectation rotational speed omega that provides according to outer ring controller 8
g, and speed probe 7 detects the current rotational speed omega that obtains
c, use the speed closed loop control algorithm that comprises generated output control (controlling its rotating speed by the electric power that regulator generator sends), reverse electrodynamic braking technology, make the rotating speed of wind-driven generator 6 arrive the expectation rotational speed omega fast
g
The outer ring controller 9 of dynamo-electric coordination is used for receiving in real time the signal of diaxon dip sensor 1 and 2, air velocity transducer 10, speed probe 7, and thus, calculates the vibration severity of rotary main shaft 3, the optimized rotating speed ω under the maximal power tracing target
Op, the chatter earthquake intensity of judgement rotary main shaft 3 is determined the expectation rotational speed omega of wind-driven generator with respect to the strong and weak degree of critical regulation and control threshold value and maximum safety regulation and control threshold value
g, oppositely electrodynamic braking instruction, electromagnetism brake holding instruction and shutdown, reset signal;
Wind-driven generator 6 is selected the switching magnetic-resistance wind-driven generator for use.Among this embodiment, because the mechanical motion of rotary main shaft 3 and static part 11 relation, switching magnetic-resistance wind-driven generator 6 be external rotor type, i.e. the external rotor of generator 6 synchronous rotation that be connected with rotary main shaft 3, the inner stator transfixion that is connected with static part 11;
Ring controller 8 is also stored the parameter relevant with control with the outer ring controller 9 of dynamo-electric coordination in the rotating speed.
Predefined critical regulation and control threshold k
t: represent an amount of rotary main shaft chatter earthquake intensity power, when the earthquake intensity of rotary main shaft chatter less than critical regulation and control threshold k
tThe time, expression rotary main shaft chatter is faint, is in the favorable mechanical steady-working state, need not the extraneous regulation and control of intervening.
Predefined maximum safety regulation and control threshold k
s: represent an amount of rotary main shaft chatter earthquake intensity power, K
sK
t, when the earthquake intensity of rotary main shaft chatter is regulated and control threshold k safely greater than maximum
sThe time, expression rotary main shaft chatter is violent, is about to reach breakneck mechanical instability working state, if do not adopt stronger directly reduction of speed means regulation and control fast, may cause the accident.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104579058A (en) * | 2014-12-30 | 2015-04-29 | 江西清华泰豪三波电机有限公司 | Method for quick switching of windings of single-phase synchronous generator through lookup interval jump |
| WO2016095045A1 (en) * | 2014-12-19 | 2016-06-23 | Endurance Wind Power Inc. | Portable electric braking system for wind turbines with induction generators |
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| CN101660496A (en) * | 2008-12-12 | 2010-03-03 | 中金富华能源科技有限公司 | Vertical shaft wind power generating system being capable of avoiding strong wind |
| WO2011031380A1 (en) * | 2009-09-11 | 2011-03-17 | Durham Gary L | Dynamic cross-section fluid energy capture |
| CN202055997U (en) * | 2011-05-10 | 2011-11-30 | 济南磁能科技有限公司 | Automatic paddle-adjusting device of vertical-axis wind turbine |
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2012
- 2012-02-29 CN CN201310221138.XA patent/CN103277253B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101460735A (en) * | 2006-05-10 | 2009-06-17 | 轻型飞机发动机研究有限公司 | System and process for automatically controlling the flight of power wing airfoils |
| KR100915676B1 (en) * | 2007-07-16 | 2009-09-09 | (주)에스지이에너지 | Wind power generator |
| CN101660496A (en) * | 2008-12-12 | 2010-03-03 | 中金富华能源科技有限公司 | Vertical shaft wind power generating system being capable of avoiding strong wind |
| WO2011031380A1 (en) * | 2009-09-11 | 2011-03-17 | Durham Gary L | Dynamic cross-section fluid energy capture |
| CN202055997U (en) * | 2011-05-10 | 2011-11-30 | 济南磁能科技有限公司 | Automatic paddle-adjusting device of vertical-axis wind turbine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095045A1 (en) * | 2014-12-19 | 2016-06-23 | Endurance Wind Power Inc. | Portable electric braking system for wind turbines with induction generators |
| CN104579058A (en) * | 2014-12-30 | 2015-04-29 | 江西清华泰豪三波电机有限公司 | Method for quick switching of windings of single-phase synchronous generator through lookup interval jump |
| CN104579058B (en) * | 2014-12-30 | 2017-10-31 | 江西清华泰豪三波电机有限公司 | Table look-up redirect interval realize the method that single phase synchronous generator winding is switched fast |
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