CN113323802A - Fan becomes oar system safety interlock - Google Patents
Fan becomes oar system safety interlock Download PDFInfo
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- CN113323802A CN113323802A CN202110802247.5A CN202110802247A CN113323802A CN 113323802 A CN113323802 A CN 113323802A CN 202110802247 A CN202110802247 A CN 202110802247A CN 113323802 A CN113323802 A CN 113323802A
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- interlocking
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- 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
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/328—Blade pitch angle
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a fan variable-pitch system safety interlocking device, which belongs to the technical field of wind power generation and comprises a line change-over switch, a position detection module and an interlocking execution module which are configured on each variable-pitch system, wherein two normally open contacts of the interlocking execution module of a certain blade are respectively connected to enabling lines II of the other two variable-pitch systems, the enabling lines II of the variable-pitch systems are used as current conducting loops by utilizing the conversion of the line change-over switch, and in combination with the conducting and attracting actions of an interlocking relay of the interlocking execution module, each enabling line II is in a conducting state if the blade is in a safe position range, and the other two enabling lines are in a disconnecting state if the angle of the certain blade is in an unsafe position range, so that the blade is opened and adjusted to form an interlocking relationship with each other.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a safety interlocking device of a fan variable pitch system.
Background
The variable pitch system of the wind turbine generator serves as a first brake of the wind turbine generator and plays a role in lifting the safety of the wind turbine generator. In the maintenance of a fan variable pitch system, the blades can be manually operated to reach the 0-degree position. 3 paddles of the existing fan of our company can be located at the 0-degree position at the same time, and if 3 paddles are located at the 0-degree position at the same time in the actual maintenance work, great risks exist for the safety of the fan and maintainers.
An investigation report of a collapse accident of a certain wind power plant in China indicates that when a maintainer maintains a variable pitch system, three blades are all opened to about 0 degree, the wind speed is 6 m/h, the maintainer operates to brake and release a main shaft by mistake, so that after the wind turbine rotates, the maintainer does not effectively perform blade retracting operation, the wind turbine is in continuous idle running when the blades are fully opened, the wind turbine rapidly accelerates to enter an overspeed state, one blade cannot bear excessive centrifugal force to crack, power imbalance is caused, and finally the wind turbine falls into a tower.
Disclosure of Invention
The invention aims to solve the problems and provide a safety interlocking device for a variable pitch system of a fan.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the safety interlocking device for the variable-pitch system of the fan defines that the fan is provided with a blade A, a blade B and a blade C, the blade A, the blade B and the blade C are respectively provided with the variable-pitch system A, the variable-pitch system B and the variable-pitch system C, and the safety interlocking device comprises the following contents:
a line transfer switch configured to the pitch system; the axle box servo control module and the central control box of each variable pitch system are respectively provided with two parallel enabling lines for outputting enabling signals, and the switching contact of the line change-over switch is respectively connected to each enabling line of each variable pitch system; when the line change-over switch is in an initial state, the change-over contact on the enabling line I of each variable pitch system is closed, so that the enabling line I is in a conducting state, and meanwhile, the change-over contact on the enabling line II is disconnected; when the line change-over switch is changed to the interlocking state, the change-over contact on the enabling line II of each variable pitch system is closed, and meanwhile, the change-over contact on the enabling line I is opened, so that the enabling line I is in the turn-off state;
the position detection module is respectively configured on each blade and used for detecting and acquiring the angle information of the corresponding blade and transmitting the angle information to the axle box power supply management module of the blade;
the interlocking execution module is respectively configured on each variable pitch system; the interlocking execution module comprises an interlocking relay and two normally open contacts thereof, the axle box power management module of each variable pitch system is connected with and controls the interlocking relay of the corresponding interlocking execution module to be in a conducting state or a switching-off state, and the two normally open contacts of the interlocking execution module are respectively connected to the enabling lines II of the other two variable pitch systems; and if the angle information is in the non-safety position range, the interlocking relay is in a turn-off state so that the corresponding normally open contact is kept disconnected.
The pitch system A, the pitch system B and the pitch system C are respectively provided with an interlocking execution module A, an interlocking execution module B and an interlocking execution module C; the axle box power management module of the variable pitch system A is connected with an interlocking relay of the interlocking execution module A to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module A are respectively connected to an enabling line II of the variable pitch system B and an enabling line II of the variable pitch system C; the axle box power management module of the variable pitch system B is connected with an interlocking relay of the interlocking execution module B to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module B are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system C; and the axle box power management module of the variable pitch system C is connected with an interlocking relay of the interlocking execution module C to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module C are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system B.
The safety interlocking device has the following safety interlocking process under the condition that the line change-over switch is in an interlocking state:
at the beginning, the angles of the blades A, B and C are all in a safe position range, the conversion contacts and the normally open contacts on the enabling lines II of the variable pitch system A, the variable pitch system B and the variable pitch system C are all in a closed state, and the 3 enabling lines II are all in a conducting state, so that the angle of any blade can be adjusted through the corresponding variable pitch system and the enabling line II;
the angle of the blade A is adjusted to be in a blade opening adjusting state, the angle of the blade A is in an unsafe position range, the interlocking relay of the variable pitch system A is in a turn-off state, the enabling lines II of the variable pitch system B and the variable pitch system C are both in a turn-off state, so that the angles of the blade B and the blade C cannot be adjusted through the corresponding enabling lines and are kept in the safe position range, and the angle of the blade A can be adjusted through the corresponding variable pitch system and the enabling lines II.
As described above, two normally open contacts of the interlocking execution module of a certain blade are respectively connected to the enabling lines II of the other two variable pitch systems, the enabling lines II of the variable pitch systems are used as current conducting loops by utilizing the conversion of the line change-over switch, the conducting and attracting actions of the interlocking execution module interlocking relays are combined, if the blade is in a safe position range, each enabling line II is in a conducting state, if a certain blade angle is in an unsafe position range, the other two enabling lines are in a turn-off state, and the purpose of enabling the blade to be opened and adjusted to mutually form an interlocking relationship is achieved.
As an option, the interlock relay of the interlock execution module is further configured with two normally closed contacts, the two normally closed contacts of the interlock execution module are respectively connected to the enabling lines I of the other two pitch control systems, and the interlock relay is closed to disconnect the corresponding normally closed contacts. So, when paddle was opened to a paddle, the normally closed contact disconnection on the enable circuit I of two other paddles, at this moment, even circuit change over switch was dialled back and is made enable circuit I as the current return circuit that switches on, the enable circuit I of two other paddles also can't be in the on-state, further perfect interlocking relation, prevent the maloperation, improve the security.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the two normally open contacts of the interlocking execution module of a certain blade are respectively connected to the enabling lines II of the other two variable pitch systems, the enabling lines II of the variable pitch systems are used as current conducting loops by utilizing the conversion of the line change-over switch, and the conducting suction effect of the interlocking relays of the interlocking execution module is combined, so that each enabling line II is in a conducting state if the blade is in a safe position range, and the other two enabling lines are in a disconnecting state if the angle of the certain blade is in an unsafe position range, thereby achieving the purpose of enabling the blade to be opened and adjusted to mutually form an interlocking relationship. In the maintenance process of the fan, the propeller opening adjustment can be carried out on any one blade at the beginning, after one blade is opened, the enabling circuits of the variable propeller systems of the other two blades are in the off state, the other two blades can not be opened in a manual or automatic mode, the safety of the fan is ensured to the maximum extent, and the catastrophic effect caused by overspeed runaway is prevented.
2. When one paddle is opened, the normally closed contacts on the enabling lines I of the other two paddles are disconnected, at the moment, even if the line change-over switch is pulled back to enable the enabling lines I to serve as the current conducting loop, the enabling lines I of the other two paddles cannot be in a conducting state, the interlocking relation is further perfected, misoperation is prevented, and safety is improved.
Drawings
Fig. 1 is a partial schematic block diagram of the present invention.
Fig. 2 is a schematic diagram of an interlock execution module and a partial connection according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of the enabling line interlock relationship and partial connection in embodiment 1 of the present invention.
Fig. 4 is a schematic partial connection diagram of the axle box power management module of the pitch system a according to embodiment 1 of the present invention.
Fig. 5 is a schematic view of partial connection of the axle box servo control modules of the pitch system a according to embodiment 1 of the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
Example 1
Referring to fig. 1-3, it is defined that the wind turbine includes a blade a, a blade B, and a blade C, and the blade a, the blade B, and the blade C are respectively configured with a pitch system a, a pitch system B, and a pitch system C, the blade A, B and the C axle box Power Management Module (PMM) are respectively 1PMM, 2PMM, and 3PMM, and the corresponding interlock execution modules are respectively 1K3, 2K3, and 3K 3.
1-3, the safety interlock device for a wind turbine pitch system comprises the following components:
a line transfer switch configured to the pitch system; the axle box servo control module and the central control box of each variable pitch system are respectively provided with two parallel enabling lines for outputting enabling signals, and the switching contact of the line change-over switch is respectively connected to each enabling line of each variable pitch system; when the line change-over switch is in an initial state, the change-over contact on the enabling line I of each variable pitch system is closed, so that the enabling line I is in a conducting state, and meanwhile, the change-over contact on the enabling line II is disconnected; when the line change-over switch is changed to the interlocking state, the change-over contact on the enabling line II of each variable pitch system is closed, and meanwhile, the change-over contact on the enabling line I is opened, so that the enabling line I is in the turn-off state;
the position detection module is respectively configured on each blade and used for detecting and acquiring the angle information of the corresponding blade and transmitting the angle information to the axle box power supply management module of the blade;
the interlocking execution module is respectively configured on each variable pitch system; the interlocking execution module comprises an interlocking relay and two normally open contacts thereof, the axle box power management module of each variable pitch system is connected with and controls the interlocking relay of the corresponding interlocking execution module to be in a conducting state or a switching-off state, and the two normally open contacts of the interlocking execution module are respectively connected to the enabling lines II of the other two variable pitch systems; and if the angle information is in the non-safety position range, the interlocking relay is in a turn-off state so that the corresponding normally open contact is kept disconnected.
The pitch system A, the pitch system B and the pitch system C are respectively provided with an interlocking execution module A, an interlocking execution module B and an interlocking execution module C; the axle box power management module of the variable pitch system A is connected with an interlocking relay of the interlocking execution module A to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module A are respectively connected to an enabling line II of the variable pitch system B and an enabling line II of the variable pitch system C; the axle box power management module of the variable pitch system B is connected with an interlocking relay of the interlocking execution module B to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module B are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system C; and the axle box power management module of the variable pitch system C is connected with an interlocking relay of the interlocking execution module C to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module C are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system B.
Position detection module, well accuse case, axle box Power Management Module (PMM), axle box servo control module (PMC) etc. are existing technology, and position detection module can adopt angle sensor, and the axle box PMC is controlled under the enable signal effect and becomes the oar motor and rotate and accomplish and open the oar and adjust, etc. and each device is connected and all can be adopted standard line connection, no longer gives unnecessary details here.
As described above, two normally open contacts of the interlocking execution module of a certain blade are respectively connected to the enabling lines II of the other two variable pitch systems, the enabling lines II of the variable pitch systems are used as current conducting loops by utilizing the conversion of the line change-over switch, the conducting and attracting actions of the interlocking execution module interlocking relays are combined, if the blade is in a safe position range, each enabling line II is in a conducting state, if a certain blade angle is in an unsafe position range, the other two enabling lines are in a turn-off state, and the purpose of enabling the blade to be opened and adjusted to mutually form an interlocking relationship is achieved.
As will be described in detail below.
Referring to fig. 4 to 5, X13 is disposed on each axle box PMM: 1 output point (see 1PM X13:1, etc. of fig. 2) and X4:5 enable connection points (see 1A 2: X4:5, etc. of FIG. 3) to complete the connection, and other and central control box connections, etc. are not described in detail herein.
The safety interlocking device has the following safety interlocking process under the condition that the line change-over switch is in an interlocking state:
at the beginning, the angles of the blades A, B and C are all in a safe position range, the conversion contacts and the normally open contacts on the enabling lines II of the variable pitch system A, the variable pitch system B and the variable pitch system C are all in a closed state, and the 3 enabling lines II are all in a conducting state, so that the angle of any blade can be adjusted through the corresponding variable pitch system and the enabling line II;
the angle of the blade A is adjusted to be in a blade opening adjusting state, the angle of the blade A is in an unsafe position range, the interlocking relay of the variable pitch system A is in a turn-off state, the enabling lines II of the variable pitch system B and the variable pitch system C are both in a turn-off state, so that the angles of the blade B and the blade C cannot be adjusted through the corresponding enabling lines and are kept in the safe position range, and the angle of the blade A can be adjusted through the corresponding variable pitch system and the enabling lines II.
As described above, the safety interlocking can be completed in the process, in the maintenance process of the fan, the propeller opening adjustment can be performed on any one blade at the beginning, after one blade is opened, the enabling circuits of the variable propeller systems of the other two blades are in the off state, the other two blades can not be opened in the manual or automatic mode, the safety of the fan is ensured to the maximum extent, and the catastrophic consequences caused by overspeed runaway are prevented.
As an option, based on the foregoing example, in a preferred example, the interlock relay of the interlock execution module is further configured with two normally closed contacts, the two normally closed contacts of the interlock execution module are respectively connected to the enabling lines I of the other two pitch systems, and the interlock relay is pulled in to open the corresponding normally closed contacts. So, when paddle was opened to a paddle, the normally closed contact disconnection on the enable circuit I of two other paddles, at this moment, even circuit change over switch was dialled back and is made enable circuit I as the current return circuit that switches on, the enable circuit I of two other paddles also can't be in the on-state, further perfect interlocking relation, prevent the maloperation, improve the security.
The foregoing description is directed to the details of preferred and exemplary embodiments of the invention, and not to the limitations defined thereby, which are intended to cover all modifications and equivalents of the invention as may come within the spirit and scope of the invention.
Claims (4)
1. The utility model provides a fan becomes oar system safety interlock device which characterized in that: the definition fan possesses paddle A, paddle B and paddle C, and paddle A, paddle B and paddle C dispose respectively and become oar system A, become oar system B and become oar system C, and this safety interlock device includes following content:
a line transfer switch configured to the pitch system; the axle box servo control module and the central control box of each variable pitch system are respectively provided with two parallel enabling lines for outputting enabling signals, and the switching contact of the line change-over switch is respectively connected to each enabling line of each variable pitch system; when the line change-over switch is in an initial state, the change-over contact on the enabling line I of each variable pitch system is closed, so that the enabling line I is in a conducting state, and meanwhile, the change-over contact on the enabling line II is disconnected; when the line change-over switch is changed to the interlocking state, the change-over contact on the enabling line II of each variable pitch system is closed, and meanwhile, the change-over contact on the enabling line I is opened, so that the enabling line I is in the turn-off state;
the position detection module is respectively configured on each blade and used for detecting and acquiring the angle information of the corresponding blade and transmitting the angle information to the axle box power supply management module of the blade;
the interlocking execution module is respectively configured on each variable pitch system; the interlocking execution modules are interlocking relays and two normally open contacts thereof, the axle box power management module of each variable pitch system is connected with and controls the interlocking relay of the corresponding interlocking execution module to be in a conducting state or a switching-off state, and the two normally open contacts of the interlocking execution module are respectively connected to the enabling lines II of the other two variable pitch systems; and if the angle information is in the non-safety position range, the interlocking relay is in a turn-off state so that the corresponding normally open contact is kept disconnected.
2. The fan pitch system safety interlock of claim 1, wherein: the pitch system A, the pitch system B and the pitch system C are respectively provided with an interlocking execution module A, an interlocking execution module B and an interlocking execution module C; the axle box power management module of the variable pitch system A is connected with an interlocking relay of the interlocking execution module A to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module A are respectively connected to an enabling line II of the variable pitch system B and an enabling line II of the variable pitch system C; the axle box power management module of the variable pitch system B is connected with an interlocking relay of the interlocking execution module B to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module B are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system C; and the axle box power management module of the variable pitch system C is connected with an interlocking relay of the interlocking execution module C to enable the interlocking relay to be in a conducting state or a switching-off state, and two normally open contacts of the interlocking execution module C are respectively connected to an enabling line II of the variable pitch system A and an enabling line II of the variable pitch system B.
3. The fan pitch system safety interlock of claim 1, wherein: the safety interlocking device has the following safety interlocking process under the condition that the line change-over switch is in an interlocking state:
at the beginning, the angles of the blades A, B and C are all in a safe position range, the conversion contacts and the normally open contacts on the enabling lines II of the variable pitch system A, the variable pitch system B and the variable pitch system C are all in a closed state, and the 3 enabling lines II are all in a conducting state, so that the angle of any blade can be adjusted through the corresponding variable pitch system and the enabling line II;
the angle of the blade A is adjusted to be in a blade opening adjusting state, the angle of the blade A is in an unsafe position range, the interlocking relay of the variable pitch system A is in a turn-off state, the enabling lines II of the variable pitch system B and the variable pitch system C are both in a turn-off state, so that the angles of the blade B and the blade C cannot be adjusted through the corresponding enabling lines and are kept in the safe position range, and the angle of the blade A can be adjusted through the corresponding variable pitch system and the enabling lines II.
4. The fan pitch system safety interlock of claim 1, wherein: the interlocking relay of the interlocking execution module is also provided with two normally closed contacts, the two normally closed contacts of the interlocking execution module are respectively connected to the enabling circuits I of the other two variable pitch systems, and the interlocking relay is attracted to enable the corresponding normally closed contacts to be disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802247.5A CN113323802A (en) | 2021-07-15 | 2021-07-15 | Fan becomes oar system safety interlock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802247.5A CN113323802A (en) | 2021-07-15 | 2021-07-15 | Fan becomes oar system safety interlock |
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| Publication Number | Publication Date |
|---|---|
| CN113323802A true CN113323802A (en) | 2021-08-31 |
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ID=77426408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110802247.5A Pending CN113323802A (en) | 2021-07-15 | 2021-07-15 | Fan becomes oar system safety interlock |
Country Status (1)
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| CN (1) | CN113323802A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964539A (en) * | 2010-08-14 | 2011-02-02 | 东方电气集团东方汽轮机有限公司 | Relay protection device of variable pitch blade system of wind driven generator |
| US20160312766A1 (en) * | 2013-12-20 | 2016-10-27 | Fritz Schur Energy A/S | Pitch actuator arrangement and method of installing a pitch actuator arrangement |
| CN212392712U (en) * | 2020-07-06 | 2021-01-22 | 大唐陕县风力发电有限责任公司 | Power supply system of variable pitch controller of wind turbine generator |
| CN213270131U (en) * | 2020-10-22 | 2021-05-25 | 重庆华昭电气设备有限公司 | Become oar system safety interlock |
| CN112943532A (en) * | 2021-03-04 | 2021-06-11 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Blade operation interlocking method and device for variable pitch system of wind generating set |
| CN213711230U (en) * | 2020-10-13 | 2021-07-16 | 浙江运达风电股份有限公司 | Back-up power supply feathering control device of direct-current variable pitch control system |
-
2021
- 2021-07-15 CN CN202110802247.5A patent/CN113323802A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964539A (en) * | 2010-08-14 | 2011-02-02 | 东方电气集团东方汽轮机有限公司 | Relay protection device of variable pitch blade system of wind driven generator |
| US20160312766A1 (en) * | 2013-12-20 | 2016-10-27 | Fritz Schur Energy A/S | Pitch actuator arrangement and method of installing a pitch actuator arrangement |
| CN212392712U (en) * | 2020-07-06 | 2021-01-22 | 大唐陕县风力发电有限责任公司 | Power supply system of variable pitch controller of wind turbine generator |
| CN213711230U (en) * | 2020-10-13 | 2021-07-16 | 浙江运达风电股份有限公司 | Back-up power supply feathering control device of direct-current variable pitch control system |
| CN213270131U (en) * | 2020-10-22 | 2021-05-25 | 重庆华昭电气设备有限公司 | Become oar system safety interlock |
| CN112943532A (en) * | 2021-03-04 | 2021-06-11 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Blade operation interlocking method and device for variable pitch system of wind generating set |
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Application publication date: 20210831 |