CN109139367B - Wind power variable pitch system angle interlocking method and device - Google Patents
Wind power variable pitch system angle interlocking method and device Download PDFInfo
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- CN109139367B CN109139367B CN201811177637.2A CN201811177637A CN109139367B CN 109139367 B CN109139367 B CN 109139367B CN 201811177637 A CN201811177637 A CN 201811177637A CN 109139367 B CN109139367 B CN 109139367B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 5
- 238000011900 installation process Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/70—Type of control algorithm
- F05B2270/706—Type of control algorithm proportional-integral-differential
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The wind power variable pitch system angle interlocking method and device comprise a safe position feedback relay, a safe position feedback cable and an angle interlocking bypass heavy-load plug. Whether positive and negative rotation enabling of the variable pitch shaft cabinet takes effect or not is controlled by the safe position feedback relay and the safe position feedback cable, and the angle interlocking bypass is achieved through the angle interlocking bypass heavy-load plug, so that the variable pitch system is not affected by the installation procedure and the blade angle in the hoisting stage of the wind turbine generator. The method and the device can realize the angle interlocking function of the variable pitch system, and the variable pitch system can perform forward and reverse rotation operation on a single shaft cabinet without being limited by an installation process and angles of other two blades in the hoisting stage of the wind turbine generator; in the maintenance stage after the wind turbine generator is connected to the grid, the dangerous working condition that two or more blades leave the safe position simultaneously due to the fact that an operator cannot observe the actual state of the blades in the hub is avoided.
Description
Technical Field
The invention belongs to the technical field of wind power, and relates to a wind power pitch system angle inspection related method and device, in particular to a wind power pitch system angle interlocking method and device.
Background
Wind power generation technology has been developed in the world, and a pitch system is taken as an important control and protection device of a wind turbine generator, and the operability and maintainability of the pitch system are gradually valued by people. At present, the wind turbine generator needs to be assembled one by one through a variable pitch system in a hoisting stage, and needs to be assisted by the variable pitch system to check the lubrication effect of a blade gear and the installation torque of the blade in a maintenance stage after grid-connected operation. Therefore, it is important to ensure the safety and operability of the pitch system during hoisting and maintenance.
At present, the mainstream pitch control system mainly comprises 3-axis cabinets, each axis cabinet independently controls a corresponding blade, and a single axis cabinet is provided with an independent PLC or an integrated controller. For the convenience of field personnel operation, the variable pitch system is usually designed with a manual knob and a forward and reverse rotation knob. When the wind turbine generator needs to be hoisted and maintained, field personnel can switch the manual knob to a manual mode, and meanwhile, the forward and reverse rotation of the blade is realized through the forward and reverse rotation knob. Because the above operations are all performed in the hub and the actual angle state of the blades cannot be observed, a device and a method need to be designed to ensure that the blades can be independently assembled in the hoisting stage and are not affected by the installation procedure, and only one blade needs to be ensured to leave the safe position in the maintenance stage, so that the safety of the whole wind turbine generator and operators is ensured (if two or more blades leave the safe position in the maintenance stage, the wind turbine generator will have safety risks).
Disclosure of Invention
In order to ensure the operability and safety of the pitch system in the hoisting and maintenance stages, the invention provides an angle interlocking method and device of a wind power pitch system, wherein the angle information of two axle boxes in the pitch system is fed back to a third axle box in a hardware mode, so that whether the forward and reverse rotation enabling of a third blade takes effect or not is controlled; meanwhile, an angle interlocking bypass scheme is designed, so that the pitch control system is not influenced by an installation procedure and a blade angle in the hoisting stage of the wind turbine generator, and the blades are installed.
The invention adopts the following technical scheme:
an angle interlocking device of a wind power variable pitch system comprises 3 variable pitch shaft cabinets, wherein each variable pitch shaft cabinet independently controls a corresponding blade, and each single shaft cabinet is provided with an independent PLC (programmable logic controller) or an integrated controller; the method is characterized in that:
the angle interlocking device comprises a safe position feedback relay and a safe position feedback cable;
a safety position feedback relay is arranged in each variable pitch shaft cabinet and used for monitoring the blade angle corresponding to the variable pitch shaft cabinet, and when the blade angle corresponding to the variable pitch shaft cabinet reaches a safety position, a PLC or an integrated controller in the variable pitch shaft cabinet controls the relay contact to be closed; when the angle of the blade corresponding to the variable propeller shaft cabinet does not reach the safe position, the contact of the relay is disconnected;
a pair of contacts of every two pitch change shaft cabinet safety position feedback relays are connected in series through a safety position feedback cable, then the 24V control loop of a third pitch change shaft cabinet is connected, and the 24V control loop is connected with a forward and reverse rotation knob of the third pitch change shaft cabinet in series and then is connected to a forward and reverse rotation signal input point of a PLC (programmable logic controller) or an integrated controller of the third pitch change shaft cabinet.
The invention further comprises the following preferred embodiments:
the wind power variable pitch system angle interlocking device further comprises an angle interlocking bypass heavy-load plug; when the wind power pitch control system needs to be hoisted, the angle interlocking bypass heavy-load plug is used for replacing a heavy-load connector where a safety position feedback cable is located between cabinets, the bypass function of a safety position feedback relay contact is achieved, and 24V control signals directly supply power to forward and reverse signal input points.
The safety position feedback relay is a double-contact electromagnetic relay.
The blade angle corresponding to the variable-pitch shaft cabinet reaches the safe position, namely the blade angle is larger than the safe angle or the limit switch acts. The pitch system sets the blade angle 86 degrees to a safe angle. In addition, in order to avoid the problem that the machine cannot be stopped to a specified position when the angle reading of the blade is abnormal, 91-degree and 95-degree limit switches are normally arranged (the 91-degree and 95-degree limit switches are arranged at the corresponding positions of the 91-degree and 95-degree blades). When the angle reading of the variable pitch system is abnormal, the variable pitch system drives the blades to move towards the pitch retracting direction until the limit switch is triggered and then the variable pitch system is stopped.
The application also discloses an angle interlocking method of the wind power pitch system, which comprises the following steps:
step 1: a safe position feedback relay is arranged in each variable propeller shaft cabinet, the relay is a double-contact electromagnetic relay, and the coil end of the relay is controlled by an original PLC or an integrated controller in the variable propeller shaft cabinet;
when the blade angle controlled by the variable propeller shaft cabinet is detected to reach a safe position, the relay is closed; when the controlled blade angle is detected to be less than the safe position, the relay is switched off;
step 2: connecting a pair of contacts of the safety position feedback relays of two pitch shaft cabinets in series by using a safety position feedback cable;
and step 3: connecting the safe position feedback cables connected with the other two pitch shaft cabinets in series between a 24V control signal of a PLC (programmable logic controller) or an integrated controller in the 3 rd pitch shaft cabinet and a forward and reverse rotation signal input point power supply loop;
and 4, step 4: when the wind power variable pitch system is in a maintenance state, an operator performs forward and reverse rotation operation on one of the variable pitch shaft cabinets, if the blades controlled by the other two variable pitch shaft cabinets reach the safe position, the corresponding safe position feedback relay is closed, and at the moment, a forward and reverse rotation signal input point of the shaft cabinet is controlled to be electrified through a forward and reverse rotation knob, so that the blade is controlled to rotate; if the other two shaft cabinets control the blades not to reach the safe position, the corresponding safe position feedback relays are disconnected, and at the moment, the forward rotation signal input points and the reverse rotation signal input points of the shaft cabinets cannot be electrified, so that the blades cannot rotate;
and 5: when the wind power variable pitch system needs to be hoisted, an operator replaces the safe position feedback cable heavy-load connector between the original cabinets with the angle interlocking bypass heavy-load plug; at the moment, the safe position feedback relay is bypassed, and the forward and reverse signal input points of the shaft cabinet are directly electrified, so that the corresponding blades can be controlled to rotate through forward and reverse rotation operations;
step 6: and replacing the angle interlocking bypass heavy-load plug with the original safety position feedback cable heavy-load connector between cabinets before the wind turbine generator is connected to the grid.
Further, in step 1, the reaching of the safe position refers to that the blade angle of the pitch system is greater than 86 degrees or the limit switch acts. In order to avoid the problem that the machine cannot be stopped to a specified position when the angle of the blade is read abnormally, 91-degree and 95-degree limit switches are normally arranged (the 91-degree and 95-degree limit switches are arranged at the corresponding positions of the 91-degree and 95-degree blades). When the angle reading of the variable pitch system is abnormal, the variable pitch system drives the blades to move towards the pitch retracting direction until the limit switch is triggered and then the variable pitch system is stopped.
In step 2, the safe position feedback cables between the pitch axis cabinets are connected through the heavy-load connectors. Wherein the safe position feedback cable and the communication cable between the pitch system cabinets are wired in parallel.
The application has the following beneficial technical effects:
by the device and the method, in the hoisting stage of the wind turbine generator, the pitch control system can carry out positive and negative rotation operation on a single shaft cabinet without being limited by an installation procedure and angles of other two blades; in the maintenance stage after the wind turbine generator is connected to the grid, the dangerous working condition that two or more blades leave the safe position simultaneously due to the fact that an operator cannot observe the actual state of the blades in the hub is avoided, and the safety of the wind turbine generator and the operator is further ensured. The device and the method realize the interlocking of the blade angles through hardware wiring, avoid the condition that the angle interlocking function fails due to the loss of communication transmission information, simultaneously avoid the possibility that the interlocking bypass function is forgotten due to starting, and directly switch the wind turbine generator into a grid-connected mode.
Drawings
FIG. 1 is a schematic wiring diagram of a wind power pitch system safety position feedback cable according to the present application;
FIG. 2 is a schematic diagram of the safety position feedback relay wiring of the present application;
FIG. 3 is a schematic view of an angle interlock implementation of the present application (taking an axle cabinet A as an example);
fig. 4 is an effect diagram of the angle interlock bypass heavy duty plug of the present application.
Detailed description of the preferred embodiments
The technical scheme of the invention is further explained in detail in the following with the accompanying drawings of the specification.
As shown in fig. 1, the wind power pitch system angle interlocking device is mainly applied to the inside of a pitch system. The wind turbine main control system realizes the interaction of the power supply and the communication information of the pitch control system through a power line and a communication line in the slip ring. A safe position feedback cable is designed between the variable pitch systems, and angle information of two shaft cabinets is fed back to a third shaft cabinet. The safety position feedback cable and the communication cable are arranged in parallel, and the same heavy-load connector is used for realizing connection between the shaft cabinets.
As shown in fig. 2, the safety position feedback relay is a double-contact electromagnetic relay, a safety position feedback relay is arranged in each pitch shaft cabinet, and a coil end of the relay is connected to a DO output end of a PLC or an integrated controller in the cabinet. When the shaft cabinet detects that the angle of the controlled blade reaches the safe position, the relay contact is triggered to be attracted; when the shaft cabinet detects that the angle of the controlled blade does not reach the safe position, the contact of the relay is disconnected. The contact of the relay adopts a mode that a group of two shaft cabinets are connected in series and then fed back to a third shaft cabinet. Taking the shaft cabinet A as an example, the shaft cabinet B safety position feedback relay contacts 11 and 14 are connected in series with the shaft cabinet C safety position feedback relay contacts 11 and 14, and then the shaft cabinet A is fed back.
As shown in fig. 3, taking the shaft cabinet a as an example, a 24V control signal output in the pitch axis cabinet is connected in series with the safety position feedback relay contacts (contacts 11 and 14) of the shaft cabinet B and the shaft cabinet C, and the forward and reverse rotation knobs of the pitch axis cabinet control the corresponding forward and reverse rotation DI points to be powered. When the blades corresponding to the shaft cabinets B and C reach the safe positions, the safe position feedback relay contacts of the shaft cabinets B and C are sucked, at the moment, the forward and reverse rotation knobs of the shaft cabinet A are controlled to perform forward rotation and reverse rotation operations, and the corresponding 24V signals are obtained at the forward and reverse rotation DI points of the shaft cabinet; when the corresponding blade angles of the shaft cabinets B and C do not reach the safe positions, the safe position feedback relay contacts in the shaft cabinets B and C are in a disconnected state, at the moment, the forward and reverse rotation knob of the control shaft cabinet A performs forward and reverse rotation operation, and the forward and reverse rotation DI points in the shaft cabinet cannot be powered.
As shown in fig. 4, the angle interlock bypass heavy duty plug can replace the heavy duty connector of the original safety position feedback cable and the communication cable. Taking the shaft cabinet A as an example, when the angle interlocking bypass heavy-load plug is used, the safe position feedback relay contact connecting line of the shaft cabinets B and C is bypassed, and at the moment, the forward and reverse rotation knob of the control shaft cabinet A can enable the corresponding forward rotation DI point and the corresponding reverse rotation DI point to be directly electrified.
Because the angle interlocking bypass heavy-load plug and the heavy-load connector of the safe position feedback cable are designed to be used alternatively, the angle interlocking bypass heavy-load plug is used in the hoisting stage, and the influence of unknown angle states of the other two blades and the blade installation process can be avoided; in the maintenance stage after grid connection, the heavy-load connector of the safety position feedback cable and the communication cable is used, so that the three blades can be manually rotated in the hub, and the angle of the two blades is guaranteed to reach the safety position.
The application also discloses a wind power pitch system angle interlocking method based on the wind power pitch system angle interlocking device, and the angle interlocking method comprises the following steps:
step 1: a safe position feedback relay is arranged in each variable propeller shaft cabinet, the relay is a double-contact electromagnetic relay, and the coil end of the relay is controlled by an original PLC or an integrated controller in the variable propeller shaft cabinet;
when the blade angle controlled by the variable propeller shaft cabinet is detected to reach a safe position, the relay is closed; when the controlled blade angle is detected not to reach the safety position, the relay is switched off; the safe position is achieved by the fact that the angle of the blade is larger than 86 degrees or the limit switch acts. In order to avoid the problem that the machine cannot be stopped to a specified position when the angle of the blade is read abnormally, 91-degree and 95-degree limit switches are normally arranged (the 91-degree and 95-degree limit switches are arranged at the corresponding positions of the 91-degree and 95-degree blades). When the angle reading of the variable pitch system is abnormal, the variable pitch system drives the blades to run towards the pitch retracting direction (the pitch retracting direction is from 0 degree to 90 degrees) until the limit switch is triggered and then the variable pitch system is stopped.
Step 2: connecting a pair of contacts of the safety position feedback relays of two pitch shaft cabinets in series by using a safety position feedback cable;
the safety position feedback cable and the communication cable between the variable pitch system cabinets are wired in parallel and connected to each variable pitch shaft cabinet through the heavy-load connector;
and step 3: connecting the safe position feedback cables connected with the other two pitch shaft cabinets in series between a 24V control signal of a PLC (programmable logic controller) or an integrated controller in the 3 rd pitch shaft cabinet and a forward and reverse rotation signal input point power supply loop;
and 4, step 4: when the wind power variable-pitch system is in a maintenance state, an operator performs forward and reverse rotation operation on one variable-pitch shaft cabinet, if the blades controlled by the other two variable-pitch shaft cabinets reach the safe position, the corresponding safe position feedback relay is closed, and at the moment, the forward and reverse rotation DI point of the shaft cabinet is controlled to be electrified through the forward and reverse rotation knob, so that the blade is controlled to rotate; if the other two shaft cabinets control the blades not to reach the safe position, the corresponding safe position feedback relays are disconnected, and at the moment, the forward rotation signal input points and the reverse rotation signal input points of the shaft cabinets cannot be electrified, so that the blades cannot rotate;
and 5: when the wind power variable pitch system needs to be hoisted, an operator replaces the safe position feedback cable heavy-load connector between the original cabinets with the angle interlocking bypass heavy-load plug; the safe position feedback relay is bypassed, and the positive rotation DI point and the reverse rotation DI point of the shaft cabinet are directly electrified, so that the corresponding blades can be controlled to rotate through positive and negative rotation operation;
step 6: and replacing the angle interlocking bypass heavy-load plug with the original safety position feedback cable heavy-load connector between cabinets before the wind turbine generator is connected to the grid. Therefore, when the fan is maintained after grid connection, the forward rotation and reverse rotation operation of a single blade is limited by whether the other two blades reach the safe position or not.
The foregoing detailed description and drawings are merely illustrative of the present invention for the purpose of facilitating a better understanding of the concepts of the invention, and are not intended to limit the scope of the invention. Variations of the invention may be made by those skilled in the art without departing from the spirit of the invention. Any modification or variation made without departing from the spirit of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. An angle interlocking device of a wind power variable pitch system comprises 3 variable pitch shaft cabinets, wherein each variable pitch shaft cabinet independently controls a corresponding blade, and each single shaft cabinet is provided with an independent PLC (programmable logic controller) or an integrated controller; the method is characterized in that:
the angle interlocking device comprises a safe position feedback relay and a safe position feedback cable;
a safety position feedback relay is arranged in each variable pitch shaft cabinet and used for monitoring the blade angle corresponding to the variable pitch shaft cabinet, and when the blade angle corresponding to the variable pitch shaft cabinet reaches a safety position, a PLC or an integrated controller in the variable pitch shaft cabinet controls the relay contact to be closed; when the angle of the blade corresponding to the variable propeller shaft cabinet does not reach the safe position, the contact of the relay is disconnected;
a pair of contacts of every two pitch change shaft cabinet safety position feedback relays are connected in series through a safety position feedback cable, then the 24V control loop of a third pitch change shaft cabinet is connected, and the 24V control loop is connected with a forward and reverse rotation knob of the third pitch change shaft cabinet in series and then is connected to a forward and reverse rotation signal input point of a PLC (programmable logic controller) or an integrated controller of the third pitch change shaft cabinet.
2. The wind power pitch system angle interlocking device of claim 1, characterized in that:
the wind power variable pitch system angle interlocking device further comprises an angle interlocking bypass heavy-load plug; when the wind power pitch control system needs to be hoisted, the angle interlocking bypass heavy-load plug is used for replacing a heavy-load connector where the safety position angle feedback cable is located between cabinets, the bypass function of the safety position feedback relay contact is achieved, and the 24V control signal directly supplies power to the positive and reverse signal input points.
3. The wind power pitch system angle interlocking device according to claim 1 or 2, characterized in that:
the safety position feedback relay is a double-contact electromagnetic relay.
4. The wind power pitch system angle interlocking device according to claim 1 or 2, characterized in that:
the blade angle corresponding to the variable-pitch shaft cabinet reaches the safe position, namely the blade angle is larger than the set safe angle or the limit switch acts.
5. The wind power pitch system angle interlocking device of claim 4, wherein:
the set safety angle refers to the angle of the blade being 86 degrees;
and the limit switch acts when the blades rotate to 91 degrees and 95 degrees, so that the variable pitch system stops running.
6. A wind power pitch system angle interlocking method based on the wind power pitch system angle interlocking device of any one of claims 1 to 5, the angle interlocking method comprising the following steps:
step 1: a safe position feedback relay is arranged in each variable propeller shaft cabinet, the relay is a double-contact electromagnetic relay, and the coil end of the relay is controlled by an original PLC or an integrated controller in the variable propeller shaft cabinet;
when the blade angle controlled by the variable propeller shaft cabinet is detected to reach a safe position, the relay is closed; when the controlled blade angle is detected not to reach the safety position, the relay is switched off;
step 2: connecting a pair of contacts of the safety position feedback relays of two pitch shaft cabinets in series by using a safety position feedback cable;
and step 3: connecting the safe position feedback cables connected with the other two pitch shaft cabinets in series between a 24V control signal of a PLC (programmable logic controller) or an integrated controller in the 3 rd pitch shaft cabinet and a forward and reverse rotation signal input point power supply loop;
and 4, step 4: when the wind power variable pitch system is in a maintenance state, an operator performs forward and reverse rotation operation on one of the variable pitch shaft cabinets, if the blades controlled by the other two variable pitch shaft cabinets reach the safe position, the corresponding safe position feedback relay is closed, and at the moment, a forward and reverse rotation signal input point of the shaft cabinet is controlled to be electrified through a forward and reverse rotation knob, so that the blade is controlled to rotate; if the other two shaft cabinets control the blades not to reach the safe position, the corresponding safe position feedback relays are disconnected, and at the moment, the forward rotation signal input points and the reverse rotation signal input points of the shaft cabinets cannot be electrified, so that the blades cannot rotate;
and 5: when the wind power variable pitch system needs to be hoisted, an operator replaces the safe position feedback cable heavy-load connector between the original cabinets with the angle interlocking bypass heavy-load plug; at the moment, the safe position feedback relay is bypassed, and the forward and reverse signal input points of the shaft cabinet are directly electrified, so that the corresponding blades can be controlled to rotate through forward and reverse rotation operations;
step 6: and replacing the angle interlocking bypass heavy-load plug with the original safety position feedback cable heavy-load connector between cabinets before the wind turbine generator is connected to the grid.
7. The wind power pitch system angle interlocking method according to claim 6, characterized in that:
in step 2, the safe position feedback cables between the pitch axis cabinets are connected through a heavy-duty connector, wherein the safe position feedback cables and the communication cables between the pitch system cabinets are wired in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811177637.2A CN109139367B (en) | 2018-10-10 | 2018-10-10 | Wind power variable pitch system angle interlocking method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811177637.2A CN109139367B (en) | 2018-10-10 | 2018-10-10 | Wind power variable pitch system angle interlocking method and device |
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| CN109139367A CN109139367A (en) | 2019-01-04 |
| CN109139367B true CN109139367B (en) | 2020-05-12 |
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| CN201811177637.2A Active CN109139367B (en) | 2018-10-10 | 2018-10-10 | Wind power variable pitch system angle interlocking method and device |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029434A (en) * | 1975-05-22 | 1977-06-14 | Kenney Clarence E | Variable pitch mounting for airfoil blades of a windmill or propeller |
| CN1270079C (en) * | 2001-07-20 | 2006-08-16 | 阿洛伊斯·沃本 | Method for in situ construction of a wind power plant |
| US7750493B2 (en) * | 2007-08-14 | 2010-07-06 | General Electric Company | Wind turbine assemblies and slip ring assemblies for wind blade pitch control motors |
| SE534012C2 (en) * | 2009-03-13 | 2011-03-29 | Ge Wind Energy Norway As | Blade Assembly |
| CN102297101A (en) * | 2011-05-20 | 2011-12-28 | 深圳市正耀科技有限公司 | Method for manufacturing multiple groups of blade wheels of wind power generator |
| CN205714598U (en) * | 2016-06-17 | 2016-11-23 | 中冶建工集团有限公司 | A kind of blade locking structure of wind power equipment |
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2018
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