CN218493723U - Starting device of wind turbine generator - Google Patents
Starting device of wind turbine generator Download PDFInfo
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- CN218493723U CN218493723U CN202222348658.4U CN202222348658U CN218493723U CN 218493723 U CN218493723 U CN 218493723U CN 202222348658 U CN202222348658 U CN 202222348658U CN 218493723 U CN218493723 U CN 218493723U
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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
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Abstract
The application provides a wind turbine generator system's quick-witted device that opens includes: the first anemoscope, the second anemoscope, the third anemoscope, the fourth anemoscope and the controller are arranged on the top of the engine room side by side; the first anemoscope is used for measuring the average wind speed of 30 seconds; the second wind speed measuring instrument is used for measuring the average wind speed for 1 minute; the third wind speed measuring instrument is used for measuring the average wind speed for 5 minutes; the fourth wind speed measuring instrument is used for measuring the average wind speed in 10 minutes; the controller is used for determining the weighted average wind speed according to the average wind speed of 30 seconds, the average wind speed of 1 minute, the average wind speed of 5 minutes, the average wind speed of 10 minutes and the weighting coefficient of each average wind speed, and controlling the rotating blades to start at a target angle when the weighted average wind speed is larger than the cut-in wind speed. According to the method and the device, the weighted average wind speed is used as a judgment condition for changing the shutdown into the startup, so that the fan can be started quickly, the wind energy utilization efficiency of the unit is improved, and the mechanical loss and the self-consumption of parts are reduced.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a starting device of a wind turbine generator.
Background
Wind energy is a clean renewable energy source, and the wind power generation industry around the world is in rapid development. The starting and stopping of the wind turbine generator relate to the efficiency of wind energy utilization and the safety of the wind turbine generator, and the research on the wind turbine generator is an important link of the research on the wind turbine generator.
Wind is continuously changed, generally speaking, when the wind speed is too low, the feathering of the unit needs to be controlled, so that the unit is in a state of almost completely stopping rotating, thereby reducing the abrasion of mechanical parts on one hand, and on the other hand, closing auxiliary equipment such as a cooling fan and the like after the machine is stopped, and reducing the self-power consumption; after the wind speed rises, the unit needs to be controlled to operate by opening the propeller, and grid-connected power generation is started. In the process from shutdown to startup, a startup device needs to be arranged, and the performance of the startup device has an important influence on the wind energy utilization efficiency of the wind turbine generator.
In practice, there is a need for a starting device of a wind turbine generator, which is used for improving the wind energy utilization efficiency of the wind turbine generator.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the embodiments of the present application is to provide a startup device for a wind turbine generator, which can use weighted average wind speeds of wind speeds collected by a first wind speed measuring instrument, a second wind speed measuring instrument, a third wind speed measuring instrument, and a fourth wind speed measuring instrument as a determination condition for changing a shutdown state into a startup state of the wind turbine generator, when a fan is in a fast wind-up state, the fan is quickly started, so that wind energy utilization efficiency of the wind turbine generator is improved, when a wind speed continuously fluctuates slightly above and below a cut-in wind speed, unnecessary startup and shutdown of the fan is reduced, and mechanical loss and self consumption of components are reduced.
In a first aspect, an embodiment of the present application provides a startup device for a wind turbine generator, where the startup device includes: the first anemoscope, the second anemoscope, the third anemoscope, the fourth anemoscope and the controller are arranged on the top of the engine room side by side; wherein,
the first wind speed measuring instrument is used for measuring the average wind speed of 30 seconds and sending the average wind speed of 30 seconds to the controller;
the second wind speed measuring instrument is used for measuring the average wind speed of 1 minute and sending the average wind speed of 1 minute to the controller;
the third wind speed measuring instrument is used for measuring 5-minute average wind speed and sending the 5-minute average wind speed to the controller;
the fourth wind speed measuring instrument is used for measuring the average wind speed of 10 minutes and sending the average wind speed of 10 minutes to the controller;
the controller is used for determining weighted average wind speed according to the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, the 10-minute average wind speed and weighting coefficients corresponding to all the average wind speeds, and controlling the rotating blade to start at a target angle when the weighted average wind speed is larger than a preset cut-in wind speed.
In a possible embodiment, the target angle is a first preset angle; alternatively, the target angle is related to a tip speed ratio.
In a possible implementation, the starting device further includes: an impeller rotating speed measuring encoder arranged inside the engine room;
the impeller rotating speed measuring encoder is used for measuring the rotating speed of an impeller of the fan and sending the rotating speed of the impeller to the controller, so that the controller can determine the outer diameter tangential speed u of the wind wheel based on the rotating speed of the impeller;
the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument and the fourth wind speed measuring instrument are also used for measuring the speed v of wind before entering a blade wheel;
the controller is further configured to determine a real-time tip speed ratio of the wind turbine generator according to a tip speed ratio formula λ = u/v, and determine an optimal pitch angle β of the maximum wind energy absorption rate corresponding to the real-time tip speed ratio as the target angle.
In one possible embodiment, the speed v of the wind before it enters the impeller is determined as follows:
the controller is further configured to determine an average value of wind speeds measured by the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument, and the fourth wind speed measuring instrument as a speed v of the wind before the wind enters the impeller.
In a possible embodiment, the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, and the 10-minute average wind speed are respectively given by the following weighting coefficients: 0.2, 0.3, 0.2.
In a possible implementation manner, when the wind turbine generator is in a grid-connected power generation state, the controller is further configured to control the rotating blade to stop at a second preset angle when the weighted average wind speed is less than or equal to the cut-in wind speed.
The wind turbine generator starting device provided by the embodiment of the application can be used for changing the weighted average wind speed of the wind speed collected by the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument and the fourth wind speed measuring instrument into the judgment condition for starting the wind turbine generator from the stop state, when the fan is in the fast wind-starting state, the fan is quickly started, the utilization efficiency of wind energy of the wind turbine generator is improved, when the wind speed continuously fluctuates slightly above and below the cut-in wind speed, unnecessary start-stop of the fan is reduced, and the mechanical loss and the self consumption of components are reduced.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 shows a schematic structural diagram of a starting device of a wind turbine generator provided in an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a method for determining a weighted average wind speed of a wind turbine according to an embodiment of the present application;
FIG. 3 shows a schematic diagram for determining a starting target angle of a wind turbine generator according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
At present, wind energy is a clean renewable energy source, and the abundance of the wind energy is huge, so that the wind power generation industry in the world is in rapid development. The starting and stopping of the wind turbine generator relate to the efficiency of wind energy utilization and the safety of the wind turbine generator, and the research on the wind turbine generator is an important link of the research on the wind turbine generator.
Wind is continuously changed, generally speaking, when the wind speed is too low, the feathering of the unit needs to be controlled, so that the unit is in a state of almost completely stopping rotating, thereby reducing the abrasion of mechanical parts on one hand, and on the other hand, closing auxiliary equipment such as a cooling fan and the like after the machine is stopped, and reducing the self-power consumption; after the wind speed rises, the unit needs to be controlled to operate by opening the propeller, and grid-connected power generation is started. In the process from shutdown to startup, a startup device needs to be arranged, and the performance of the startup device has an important influence on the wind energy utilization efficiency of the wind turbine generator. In practice, there is a need for a starting device of a wind turbine generator, which is used for improving the wind energy utilization efficiency of the wind turbine generator.
Based on the above problems, the embodiment of the present application provides a startup device for a wind turbine generator, which can use the weighted average wind speed of the wind speeds collected by a first wind speed measuring instrument, a second wind speed measuring instrument, a third wind speed measuring instrument and a fourth wind speed measuring instrument as a judgment condition for changing a shutdown mode into a startup mode of the wind turbine generator, when a fan is in a fast wind-starting state, the fan is started quickly, the wind energy utilization efficiency of the wind turbine generator is improved, when the wind speed continuously fluctuates slightly above and below a cut-in wind speed, unnecessary startup and shutdown of the fan is reduced, and the mechanical loss and the self consumption of components are reduced.
The above-mentioned drawbacks are the results of the inventor after practical and careful study, and therefore, the discovery process of the above-mentioned problems and the solution proposed by the present application to the above-mentioned problems in the following should be the contribution of the inventor to the present application in the process of the present application.
The technical solutions in the present application will be described clearly and completely with reference to the drawings in the present application, and it should be apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the present application, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The embodiment of the application provides a wind turbine generator system opens quick-witted device, it includes to open quick-witted device: the first anemoscope, the second anemoscope, the third anemoscope, the fourth anemoscope and the controller are arranged on the top of the engine room side by side;
the first anemoscope is used for measuring the average wind speed of 30 seconds and sending the average wind speed of 30 seconds to the controller.
And the second wind speed measuring instrument is used for measuring the average wind speed for 1 minute and sending the average wind speed for 1 minute to the controller.
And the third wind speed measuring instrument is used for measuring the average wind speed for 5 minutes and sending the average wind speed for 5 minutes to the controller.
And the fourth wind speed measuring instrument is used for measuring the average wind speed of 10 minutes and sending the average wind speed of 10 minutes to the controller.
The controller is used for determining weighted average wind speed according to the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, the 10-minute average wind speed and weighting coefficients corresponding to all the average wind speeds, and controlling the rotating blade to start at a target angle when the weighted average wind speed is larger than a preset cut-in wind speed.
In practice, the wind speed is continuously changed, and when the wind speed is too low, the feathering of the unit is controlled to enable the unit to be in a state of almost completely stopping rotating, so that the abrasion of mechanical parts can be reduced, auxiliary equipment such as a cooling fan and the like can be turned off, and the self-power consumption is reduced. And when the wind speed is increased, controlling the unit to operate by opening the propeller and starting grid-connected power generation. In the process from shutdown to startup, the starting condition is wind speed, and the starting process has important influence on the wind energy utilization efficiency of the wind turbine generator.
The existing scheme for controlling the start of the wind turbine generator is as follows: and judging whether the average wind speed reaches a preset cut-in wind speed or not, if the average wind speed is greater than the preset cut-in wind speed, controlling the wind turbine generator to start, wherein the average wind speed generally adopts 5 minutes of average wind speed, and if the 5 minutes of average wind speed is greater than the cut-in wind speed (generally 3 m/s), the wind turbine generator starts to execute a starting action.
However, the starting condition of the average wind speed with a fixed time length has certain limitations: if the environment is in a rapid wind starting state, the average wind speed can reach the cut-in wind speed only after a period of time delay, and the start-up time is delayed; if the wind speed continuously fluctuates slightly above and below the cut-in wind speed, the wind turbine cannot continuously obtain enough energy to generate power after starting, the wind turbine is quickly disconnected and stopped, the wind turbine is frequently started, continuous and stable grid-connected power generation is not facilitated, and certain loss is caused to mechanical components of the wind turbine.
Therefore, in the embodiment of the present application, 30-second average wind speed, 1-minute average wind speed, 5-minute average wind speed, and 10-minute average wind speed are used as the determination conditions for starting the wind turbine, and accordingly, 4 wind speed measuring instruments are used to obtain average wind speeds of different time lengths, as shown in fig. 1, fig. 1 is a schematic structural diagram of a starting device of a wind turbine provided in the embodiment of the present application, in fig. 1, 1 is a first wind speed measuring instrument, 2 is a second wind speed measuring instrument, 3 is a third wind speed measuring instrument, and 4 is a fourth wind speed measuring instrument, the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument, and the fourth wind speed measuring instrument are mounted on the top of a nacelle and can perform data transmission with a controller, the controller receives the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, and the 10-minute average wind speed respectively sent by each wind speed measuring instrument, and calculates a weighted average wind speed ave by using the following formulas:
ave＝a×30sec_ave+b×1min_ave+c×5min_ave+d×10min_ave。
wherein a is a weighting coefficient of the average wind speed of 30 seconds, and 30sec _aveis the average wind speed of 30 seconds; b is a weighting coefficient of the average wind speed of 1 minute, and 1min_ave is the average wind speed of 1 minute; c is the weighting coefficient of the average wind speed in 5 minutes, and 5min_ave is the average wind speed in 5 minutes; d is a weighting coefficient of the average wind speed of 10 minutes, and 10min _aveis the average wind speed of 10 minutes. Generally, a takes on the value of 0.2, b takes on the value of 0.3, c takes on the value of 0.3, and d takes on the value of 0.2.
Referring to fig. 2, in the schematic diagram of determining the weighted average wind speed of the wind turbine generator provided by the embodiment of the present application, the cut-in wind speed takes a value of 3m/s, the controller determines the weighted average wind speed and the cut-in wind speed after calculating the weighted average wind speed by using a calculation formula of the weighted average wind speed ave, and if the weighted average wind speed is greater than the cut-in wind speed, the controller changes the shutdown state of the wind turbine generator into the startup state.
The wind turbine generator system is realized through the rotating blade angle when the wind turbine generator system is shut down, and is realized through the rotating blade angle when the wind turbine generator system is shut down and is started again, and specifically, the controller controls the rotating blade to rotate at a target angle to start the wind turbine generator system.
According to the wind turbine generator set wind speed measuring method and device, the weighted average wind speed of the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument and the fourth wind speed measuring instrument is used as a judging condition for changing the shutdown of the wind turbine generator set into the startup of the wind turbine generator set, the wind turbine generator set can be started quickly when the wind turbine generator set is in a quick wind starting state, the wind energy utilization efficiency of the wind turbine generator set is improved, when the wind speed continuously fluctuates up and down at the cut-in wind speed in a small range, unnecessary startup and shutdown of the wind turbine generator set are reduced, and mechanical loss and self-consumption of components are reduced.
Further, when the rotating blade is controlled to start at the target angle, the target angle may be a fixed value (a first preset angle), and optionally, the first preset angle is 5 degrees/second. The target angle may also be a dynamic value, related to tip speed ratio.
Further, the starting device of the wind turbine further comprises: and the impeller rotating speed measuring encoder is installed inside the cabin.
And the impeller rotating speed measuring encoder is used for measuring the rotating speed of the impeller of the fan and sending the rotating speed of the impeller to the controller, so that the controller determines the outer diameter tangential speed u of the wind wheel based on the rotating speed of the impeller.
The first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument and the fourth wind speed measuring instrument are also used for measuring the speed v of wind before entering the impeller.
The controller is further configured to determine a real-time tip speed ratio of the wind turbine generator according to a tip speed ratio formula λ = u/v, and determine an optimal pitch angle β of the maximum wind energy absorption rate corresponding to the real-time tip speed ratio as the target angle.
In practice, when the wind speed is greater than the cut-in speed, the unit starts to perform a start-up operation, the start-up operation is performed at a certain speed, for example, 5 degrees/second, and after the start-up operation is performed to a smaller angle, the speed control is performed to make the unit operate at the grid-connected rotating speed, and the grid-connected operation is performed. Specifically, the blade angle is near 90 degrees in the standby state of the wind turbine generator, the starting process is divided into two stages, the first stage is that the rotor is opened to increase the speed to the grid-connected rotating speed to execute the grid-connected action of the converter, and the second stage is that the speed is continuously increased to the maximum wind energy absorption state after grid connection.
This application embodiment mainly innovates first stage, uses the impeller rotational speed of impeller rotational speed measurement encoder measurement fan, and impeller rotational speed measurement encoder can carry out data transmission with the controller, and the controller is after receiving the impeller rotational speed, regards as wind wheel external diameter tangential velocity u with the product of impeller rotational speed and impeller diameter. The 4 wind speed measuring instruments continuously measure wind speed, and the controller determines the average value of the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed and the 10-minute average wind speed which are respectively measured by the 4 wind speed measuring instruments as the speed v of wind before entering the impeller. And calculating the real-time blade tip speed ratio of the wind turbine generator according to a blade tip speed ratio formula lambda = u/v, presetting fan pneumatic design data in a controller, wherein the design data is the corresponding relation of the blade tip speed ratio, the wind energy absorption rate and the optimal blade angle, inquiring the fan pneumatic design data under the calculated real-time blade tip speed ratio to obtain the optimal blade angle beta corresponding to the maximum wind energy absorption rate, and determining the optimal blade angle beta as a target angle, wherein the unit of the target angle is degree/second. And the fan aerodynamic design data is the design data of the fan aerodynamic performance.
Referring to fig. 3, fig. 3 is a schematic diagram of determining a starting target angle of a wind turbine generator according to an embodiment of the present disclosure, where an impeller rotation speed measuring encoder is used to measure an impeller rotation speed, 4 wind speed measuring instruments continuously measure a wind speed, and a controller determines a tip speed ratio according to the impeller rotation speed and the wind speed, and searches a target position of a pitch angle corresponding to a current tip speed ratio, that is, an optimal pitch angle β, from pneumatic design data of a wind turbine.
According to the method and the device, the optimal blade angle which accords with the real-time operation environment of the wind turbine generator is determined according to the impeller rotating speed measured by the impeller rotating speed measuring encoder in real time and the wind speed measured by the 4 wind speed measuring instruments in real time, the rotating blade is controlled to start the machine by the optimal blade angle, the constant speed variable pitch of the existing scheme is updated to the optimal blade tip speed ratio variable pitch, the optimal wind energy utilization efficiency is kept in the starting and pitching process of the machine, the grid connection time of the starting machine is shortened, and the wind energy utilization efficiency of the wind turbine generator is improved.
In practice, an intelligent startup algorithm of the wind turbine generator is made into a program module, and the program module is loaded into a controller of the wind turbine generator to replace a startup control module of the original wind turbine generator. The wind turbine generator is started to operate, the intelligent starting algorithm operates in real time and continuously operates on line, and starting of the wind turbine generator is controlled.
Further, when the wind turbine generator is in a grid-connected power generation state, the controller is further used for controlling the rotating blade to stop at a second preset angle when the weighted average wind speed is less than or equal to the cut-in wind speed.
The weighted average wind speed is used as a judgment condition for changing the shutdown state into the startup state, and the weighted average wind speed is also used as a judgment condition for changing the grid-connected power generation state into the shutdown state. And when the weighted average wind speed is less than or equal to the preset cut-in wind speed, controlling the wind turbine generator to stop. The specific shutdown mode is as follows: and controlling the rotating blade to rotate at a second preset angle. The second preset angle is a fixed value and is set in degrees/second according to actual working conditions.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and the scope of the present application is not limited to the above-mentioned embodiments, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the embodiments described in the foregoing embodiments, or make equivalent substitutions for some features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A start-up device of a wind turbine generator, characterized in that the start-up device comprises: the first anemoscope, the second anemoscope, the third anemoscope, the fourth anemoscope and the controller are arranged on the top of the engine room side by side; wherein,
the first wind speed measuring instrument is used for measuring the average wind speed of 30 seconds and sending the average wind speed of 30 seconds to the controller;
the second wind speed measuring instrument is used for measuring the average wind speed of 1 minute and sending the average wind speed of 1 minute to the controller;
the third wind speed measuring instrument is used for measuring 5-minute average wind speed and sending the 5-minute average wind speed to the controller;
the fourth wind speed measuring instrument is used for measuring the average wind speed in 10 minutes and sending the average wind speed in 10 minutes to the controller;
the controller is used for determining a weighted average wind speed according to the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, the 10-minute average wind speed and a weighting coefficient corresponding to each average wind speed, and controlling the rotating blades to start at a target angle when the weighted average wind speed is larger than a preset cut-in wind speed.
2. The startup device for the wind turbine generator according to claim 1, wherein the target angle is a first preset angle; alternatively, the target angle is related to a tip speed ratio.
3. The startup device for a wind turbine generator according to claim 2, further comprising: the impeller rotating speed measuring encoder is arranged in the engine room;
the impeller rotating speed measuring encoder is used for measuring the rotating speed of an impeller of the fan and sending the rotating speed of the impeller to the controller, so that the controller can determine the outer diameter tangential speed u of the wind wheel based on the rotating speed of the impeller;
the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument and the fourth wind speed measuring instrument are also used for measuring the speed v of wind before entering a blade wheel;
the controller is further configured to determine a real-time tip speed ratio of the wind turbine generator according to a tip speed ratio formula λ = u/v, and determine an optimal pitch angle β of the maximum wind energy absorption rate corresponding to the real-time tip speed ratio as the target angle.
4. The startup device for a wind turbine generator according to claim 3, wherein the speed v of the wind before entering the impeller is determined by:
the controller is further configured to determine an average value of wind speeds measured by the first wind speed measuring instrument, the second wind speed measuring instrument, the third wind speed measuring instrument, and the fourth wind speed measuring instrument as a speed v of the wind before the wind enters the impeller.
5. The startup device for the wind turbine generator according to claim 1, wherein the weighting coefficients corresponding to the 30-second average wind speed, the 1-minute average wind speed, the 5-minute average wind speed, and the 10-minute average wind speed are respectively: 0.2, 0.3, 0.2.
6. The startup device for the wind turbine generator according to claim 1, wherein when the wind turbine generator is in a grid-connected power generation state, the controller is further configured to control the rotating blade to stop at a second preset angle when the weighted average wind speed is less than or equal to the cut-in wind speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222348658.4U CN218493723U (en) | 2022-09-02 | 2022-09-02 | Starting device of wind turbine generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222348658.4U CN218493723U (en) | 2022-09-02 | 2022-09-02 | Starting device of wind turbine generator |
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| CN202222348658.4U Active CN218493723U (en) | 2022-09-02 | 2022-09-02 | Starting device of wind turbine generator |
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