CN101567653A - Safety protective method of wind motor during outage caused by strong wind - Google Patents
Safety protective method of wind motor during outage caused by strong wind Download PDFInfo
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- CN101567653A CN101567653A CNA2008100363584A CN200810036358A CN101567653A CN 101567653 A CN101567653 A CN 101567653A CN A2008100363584 A CNA2008100363584 A CN A2008100363584A CN 200810036358 A CN200810036358 A CN 200810036358A CN 101567653 A CN101567653 A CN 101567653A
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Abstract
A safety protective method of a wind motor during outage caused by strong wind is used for preventing the wind motor from being damaged due to vibration during outage caused by strong wind. The safety protective method is characterized in that a generator of the wind motor forms a magnetic filed and a closed loop, and the closed loop and the magnetic filed relatively rotate by the rotation of a main shaft system of the wind motor, thereby current is formed in the closed loop and damping is generated by the thermal loss of the current, at this time, the main shaft system is positioned in a non-locking state.
Description
Technical field
Method for security protection when the present invention relates to a kind of wind motor outage caused by strong wind.
Background technology
Axis system is for the wind motor that is provided with gear box, generally comprise wheel hub, main shaft, gear box, high speed shaft and generator, for the wind motor that does not comprise gear box, generally comprise wheel hub, main shaft and generator, for example the direct-driving type wind motor.The wind motor outage caused by strong wind generally is that the control method by brake apparatus locking axis system realizes shutting down.For example; on April 29th, 2007, the CN2837540Y China utility model patent specification of bulletin was announced the brake apparatus that a kind of wind motor is shut down; this brake apparatus can realize steadily shutting down braking; but; after it does not consider to shut down braking; especially during strong wind, shut down the vibration problem of braking post brake device to blade and axis system.
The variable pitch wind motor is generally taked feathering (the blade pitch angle is adjusted to 90 degree orientation) measure when wind speed surpasses cut-out wind speed, simultaneously the brake apparatus band-type brake on the axis system and shutting down.
Yet, the quick variation of wind direction and wind speed when blowing hard, yaw system has little time reaction, so wind direction and change of wind velocity can be to the wing generation angles of attack of blade, thereby causes the significantly increase of blade aerodynamic loading.When the brake disc of brake apparatus is arranged on the main shaft, after the braking, be equivalent to wheel hub and fix, at this moment wind carries the vibration that excites blade easily, and then causes the damage of wind motor; When the brake disc of brake apparatus is arranged on the high speed shaft, after the braking, high speed shaft is by locking, at this moment, blade and axis system are exposed under the external load function fully, excite blade vibration planar easily, and coupling ground causes the twisting vibration of axis system, and then cause damage, the especially blade of wind motor and the damage of gear box.
The method of existing another kind of outage caused by strong wind, when wind motor runs into the strong wind feathering and shuts down, not locking of brake apparatus and, it is freely rotated in strong wind with main shaft and impeller (blade and wheel hub) emptying.This outage caused by strong wind method has prevented the overload of blade and axis system to a certain extent, but also not obvious to the effect that suppresses vibration.
Summary of the invention
Method for security protection when the object of the present invention is to provide a kind of wind motor outage caused by strong wind avoids wind motor to be damaged because of vibration when shutting down.
In order to realize described purpose; method for security protection during wind motor outage caused by strong wind of the present invention; be characterized in; on the generator of wind motor, form magnetic field and closed-loop path; rotation by the axis system of wind motor relatively rotates described closed-loop path and described magnetic field, thereby forms electric current in described closed-loop path, utilizes the thermal losses of described electric current to produce damping; at this moment, axis system is in not locking state.
When blowing hard; method of the present invention is not directly with the wind motor locking; neither fully wind motor be decontroled; but by on generator, forming magnetic field and closed-loop path; thermal losses by the electric current in the closed-loop path forms damping; consume thereby convert the vibrational energy that wind motor has to heat energy, and then realized the vibration damping of wind motor, vibration is to the potential damage of wind motor when having prevented outage caused by strong wind.
Method for security protection during described wind motor outage caused by strong wind; its further characteristics are; this generator is double-fed generator; at least one phase winding of the rotor of generator and stator one coil among the two is inserted DC power supply forming described magnetic field, and the rotor of generator and stator another at least one phase winding of coil among the two is formed described closed-loop path.
Method for security protection during described wind motor outage caused by strong wind; its further characteristics are; this generator is a magneto alternator, forms described magnetic field by the permanent magnet of the rotor of generator, and at least one phase winding of the coil of the stator of generator is formed described closed-loop path.
Method for security protection during described wind motor outage caused by strong wind; its further characteristics are; this generator is an asynchronous generator; at least one phase winding of the coil of the stator of generator is inserted direct current; forming described magnetic field, at least one phase winding of the coil of the rotor of generator is formed described closed-loop path.
Method for security protection during described wind motor outage caused by strong wind; its further characteristics are; this generator is the excitation-type synchronous generator, forms described magnetic field by the continuous current excitation in the rotor of generator, and at least one phase winding of the coil of the stator of generator is formed described closed-loop path.
Method for security protection during described wind motor outage caused by strong wind, its further characteristics are that described closed-loop path comprises resistance.When comprising resistance in the closed-loop path, resistance can be accelerated the consumption of vibrational energy together with the resistance of winding self.
Method for security protection during described wind motor outage caused by strong wind, its further characteristics are that described closed-loop path is to be formed by the winding short circuit.The closed-loop path is when being formed by the winding short circuit, to the consumption of vibrational energy, can be undertaken by the resistance heating of winding self.
Aforementioned purpose of the present invention, technical scheme and advantage will describe in detail in the following description.
Description of drawings
Fig. 1 is the schematic diagram of the wind motor in the first embodiment of the present invention;
Fig. 2 is the part-structure schematic diagram of the wind motor among Fig. 1;
Fig. 3 is the schematic diagram of the generator of the wind motor among Fig. 1;
Fig. 4 is the routine schematic diagram of a variation of the generator of the wind motor among Fig. 1;
Fig. 5 is the schematic diagram of the wind motor of the second embodiment of the present invention;
Fig. 6 is the schematic diagram of the generator of the wind motor among Fig. 5.
Embodiment
Below in conjunction with preferred embodiment the present invention is described in detail, should be noted that, in description described later, although employed term is to select from public term, but some term then is the applicant to be judged by it and selects, and the spirit that its detailed meanings should desire discloses according to the present invention is understood.
First embodiment
As depicted in figs. 1 and 2, wind motor comprises blade 1, vane change device, axis system and cabin 9.This axis system mainly is made up of wheel hub 2, main shaft 4, gear box 5, high speed shaft 6, generator 8.Blade 1 root is arranged on the wheel hub 2 rotationally, and vane change device drive vane 1 is rotated the propeller pitch angle of adjusting blade 1, and wheel hub 2 connects with main shaft 4, and main shaft 4 connects with the input of gear box 5, and the output of gear box 5 connects by high speed shaft 6 with generator 8.Main shaft 4 is arranged on the cabin 9 rotationally, is provided with brake apparatus between gear box 5 and the generator 8, and brake apparatus is arranged on the cabin 9.In Fig. 1 and Fig. 2, do not show vane change device and brake apparatus.
As shown in Figure 3, (whether should be shown in Fig. 1,2 and 3, because there is not blade 1 etc. among Fig. 3) generator 8 is the double-fed induction motor.When the wind motor operate as normal, wind drive vane 1 and wheel hub 2 rotate, and by main shaft 4 and gear box 5 wind energy are passed to generator 8.Coil on the stator 82 of generator 8 is connected with electrical network, and the coil on the generator amature 81 is connected with current transformer by slip-ring device, when rotor 81 rotates, generates induced current feed-in electrical network in stator 82.
Excessive and surpass cut-out wind speed at wind speed; when for example wind speed reaches 25m/s; wind motor needs feathering to shut down; for this reason; utilize vane change device drive vane 1 to adjust propeller pitch angle to 90 degree; so that blade 1 is in feather position; this moment, brake apparatus was not devoted oneself to work; and make blade 1 and main shaft 4 be in free rotary state; because blade 1 is in the position of feathering (propeller pitch angle is 90 degree); so wheel hub 2 and blade 1 can slowly rotate or back and forth rotate; then generator 8 and electrical network are thrown off; to prevent harmful effect to electrical network; because during strong wind; the quick variation of wind direction and wind speed; blade 1 is vibration planar; and cause the axis system twisting vibration; impaired for fear of wind motor because of this vibration; method for security protection during according to wind motor outage caused by strong wind of the present invention; at least one direct current 84 that inserts mutually in the three-phase coil of generator unit stator 82; form fixed magnetic field; accordingly at least one phase short circuit in the three-phase coil of generator amature 81 is formed closed circuit or seal in resistance 83 and form closed circuit; like this; change the vibration that causes in blade 1 plane at wind direction; and when causing the axis system twisting vibration; produce relative motion between generator amature 81 and the stator 82; in the closed circuit of rotor 81, produce induced current; this induced current generates heat and loss by the resistance of rotor 81 coils self or the resistance 83 that seals in; consumed the energy of vibration; played the effect of damping; reach the purpose that reduces blade 1 plane internal vibration and axis system twisting vibration, finally protected wind motor to avoid vibration damage.
In addition; in aforesaid method; as shown in Figure 4; the mode of connection of stator 82 and rotor 81 can also be exchanged; promptly insert direct current 84 at least one phase coil in generator amature 81 and form magnetic field; and form closed circuits with at least one phase short circuit in generator unit stator 82 coils or after sealing in resistance 83, and also can form damping action, wind motor is impaired when avoiding outage caused by strong wind.
Second embodiment
As illustrated in Figures 5 and 6, in the present embodiment, wind motor is the direct-driving type wind motor, and it comprises brake apparatus and cabin 19 on blade 11, vane change device (not shown), axis system, the axis system.This axis system mainly is made up of wheel hub 12, main shaft 14 and generator 18, the root of blade 11 is arranged on the wheel hub 12 rotationally, vane change device drive vane 11 is rotated and is adjusted propeller pitch angle, wheel hub 12 connects with generator amature 81, wheel hub 12 can be rotatably set on the main shaft 14, main shaft 14 and cabin 19 are fixedly connected, and generator 18 is the low-speed permanent-magnet synchronous generator, and permanent magnet 85 is arranged on the rotor 81.When wind drive vane 11 and wheel hub 12 rotations, generator amature 81 rotates around stator 82 centers.Because the electromagnetic induction effect generates induced current in stator 82, again by current transformer feed-in electrical network.
Excessive and exceed cut-out wind speed at wind speed, when for example wind speed reaches 25m/s, need feathering to shut down.At this moment, utilize vane change device drive vane 11 to adjust propeller pitch angle to 90 degree of blade 11, and with generator 18 and electrical network disengagement, brake apparatus on the axis system is not devoted oneself to work, so that blade 11 and axis system freely rotate, at this moment, because blade 11 is in the position of feathering (propeller pitch angle is 90 degree), so wheel hub 12 and blade 11 can slowly rotate or back and forth rotate.Impaired because of vibration for fear of wind motor, the method for security protection during according to wind motor outage caused by strong wind of the present invention is with at least one phase winding short circuit of the coil on the generator unit stator 82 or seal in resistance 83 back short circuits and form closed circuit.Wind direction and wind speed change fast during strong wind, cause blade 11 vibration planar, and coupling ground causes the twisting vibration of axis system.Because electromagnetic induction effect; in the coil of stator 82, will form induced current; owing to electrical loss takes place in the resistance of rotor coil self or the resistance 83 that seals in; consumed the energy of vibration; be equivalent to play the effect of damping; reach the vibration that reduces in blade 11 planes and the purpose of axis system twisting vibration, finally protect wind motor to avoid vibration damage.
According to thinking of the present invention; can also make such reasoning and extension: when generator is asynchronous generator; under feathering shutdown and blade and wheel hub idle running situation; at least one direct current that inserts mutually in the electricity generator stator coil; in rotor, generate induced current; dissipate the energy of vibration again by resistance heating, played the effect of damping, reach the purpose that reduces blade plane internal vibration and axis system twisting vibration.Final protection wind motor is avoided damaging.
In addition; when generator is the synchronous generator of excitation-type; when feathering is shut down and under the situation of impeller blade and wheel hub idle running, insert continuous current excitation (perhaps original just existence) in the generator amature, and form closed circuit with at least one phase short circuit in the stator coil or after sealing in resistance.During the axis system twisting vibration of wind motor,, dissipate the energy of vibration again by resistance heating, played the effect of damping because the electromagnetic induction effect generates induced current in stator.Reach the purpose that reduces blade plane internal vibration and axis system twisting vibration, finally protect wind motor to avoid vibration damage.
Though the present invention discloses as above with preferred embodiment, yet it is not in order to limiting the present invention, anyly is familiar with one of ordinary skill in the art, without departing from the spirit and scope of the present invention, should make the variation or the replacement of all equivalences.Therefore, protection scope of the present invention is as the criterion when looking accompanying the scope that the application's claim defined.
Claims (7)
1. the method for security protection during a wind motor outage caused by strong wind; it is characterized in that; on the generator of wind motor, form magnetic field and closed-loop path; rotation by the axis system of wind motor relatively rotates described closed-loop path and described magnetic field; thereby in described closed-loop path, form electric current; utilize the thermal losses of described electric current to produce damping, at this moment, axis system is in not locking state.
2. the method for security protection during the wind motor outage caused by strong wind according to claim 1; it is characterized in that; this generator is double-fed generator; at least one phase winding of the rotor of generator and stator one coil among the two is inserted DC power supply forming described magnetic field, and the rotor of generator and stator another at least one phase winding of coil among the two is formed described closed-loop path.
3. the method for security protection during the wind motor outage caused by strong wind according to claim 1; it is characterized in that; this generator is a magneto alternator, forms described magnetic field by the permanent magnet of the rotor of generator, and at least one phase winding of the coil of the stator of generator is formed described closed-loop path.
4. the method for security protection during the wind motor outage caused by strong wind according to claim 1; it is characterized in that; this generator is an asynchronous generator; at least one phase winding of the coil of the stator of generator is inserted direct current; forming described magnetic field, at least one phase winding of the coil of the rotor of generator is formed described closed-loop path.
5. the method for security protection during the wind motor outage caused by strong wind according to claim 1; it is characterized in that; this generator is the excitation-type synchronous generator; form described magnetic field by the continuous current excitation in the rotor of generator, at least one phase winding of the coil of the stator of generator is formed described closed-loop path.
6. as the method for security protection during the wind motor outage caused by strong wind as described in each claim in the claim 2 to 5, it is characterized in that described closed-loop path comprises resistance.
7. the method for security protection during as the described wind motor outage caused by strong wind of each claim in the claim 2 to 5 is characterized in that described closed-loop path is to be formed by the winding short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100363584A CN101567653A (en) | 2008-04-21 | 2008-04-21 | Safety protective method of wind motor during outage caused by strong wind |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100363584A CN101567653A (en) | 2008-04-21 | 2008-04-21 | Safety protective method of wind motor during outage caused by strong wind |
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| CN101567653A true CN101567653A (en) | 2009-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100363584A Pending CN101567653A (en) | 2008-04-21 | 2008-04-21 | Safety protective method of wind motor during outage caused by strong wind |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368656A (en) * | 2011-10-11 | 2012-03-07 | 清华大学 | Double-fed asynchronous motor with damping winding |
| CN104979848A (en) * | 2015-06-11 | 2015-10-14 | 深圳市长昊机电有限公司 | Converter system and double-fed wind turbine generator set shutdown method |
| CN112850430A (en) * | 2021-01-20 | 2021-05-28 | 冯奕安 | Air purification device for elevator |
-
2008
- 2008-04-21 CN CNA2008100363584A patent/CN101567653A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368656A (en) * | 2011-10-11 | 2012-03-07 | 清华大学 | Double-fed asynchronous motor with damping winding |
| CN102368656B (en) * | 2011-10-11 | 2014-02-19 | 清华大学 | Double-fed asynchronous motor with damping winding |
| CN104979848A (en) * | 2015-06-11 | 2015-10-14 | 深圳市长昊机电有限公司 | Converter system and double-fed wind turbine generator set shutdown method |
| CN112850430A (en) * | 2021-01-20 | 2021-05-28 | 冯奕安 | Air purification device for elevator |
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Open date: 20091028 |