Yaw side wind facing protection system

Abstract

The invention relates to the technical field of wind power generation, and discloses a yaw side wind facing protection system which is characterized in that a safety monitoring device sends a failure signal when a main control unit or a yaw motor fails; the control unit receives the failure signal and the wind speed signal and sends a wind turbine generator emergency shutdown signal when the wind speed exceeds a set limit value; the mechanical connecting device rotates along with the main shaft when the impeller rotates; the energy storage structure stores kinetic energy of the mechanical connecting device; and when the control unit sends out an emergency shutdown signal of the wind turbine generator and receives a failure signal, the energy storage structure is controlled to release energy, and the yaw driving unit is driven to drive the cabin to perform emergency yaw operation until a safe position is reached. When emergency shutdown is carried out and the main control unit or the yaw motor is in a failure state, the yaw side wind facing protection system mainly utilizes the mechanical transmission device, energy input is reduced through cabin yaw side wind facing, energy is absorbed through the energy storage structure, impeller speed reduction is achieved, and overspeed and safety accidents are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a yaw side wind protection system. Background Art

[0002] In the event of an emergency shutdown, existing wind turbines usually rely on an electric-driven yaw system to yaw the nacelle to the wind, in order to prevent the wind turbine from overspeeding in windy weather. However, when the main control unit or the yaw motor that constitutes the electric-driven yaw system fails to work due to a fault, the electric-driven yaw system cannot yaw the nacelle to the wind, and in windy weather, the wind turbine is prone to overspeeding. Summary of the invention

[0003] In view of this, the present invention provides a yaw side wind protection system to solve the problem that when the main control unit or the yaw motor constituting the electric drive yaw system fails to work due to a fault, the electric drive yaw system cannot realize the yaw side of the cabin facing the wind, and the wind turbine is prone to overspeed accidents in windy weather.

[0004] The present invention provides a yaw side wind protection system, comprising: A safety monitoring device, adapted to monitor the status of a main control unit or a yaw motor of an electric drive yaw system in real time, and to send a failure signal when the main control unit or the yaw motor is in a failure state; Speed ​​monitoring unit, suitable for real-time monitoring of wind speed; A control unit, connected to the safety monitoring device and the speed monitoring unit by signals, the control unit is adapted to receive a failure signal sent by the safety monitoring device and a wind speed signal sent by the speed monitoring unit, and send an emergency shutdown signal of the wind turbine when the wind speed exceeds a set limit; A mechanical connection device connected to a main shaft of the wind turbine generator set, wherein the main shaft is connected to an impeller of the wind turbine generator set, and the mechanical connection device is adapted to rotate along with the main shaft when the impeller rotates; An energy storage structure is connected to the mechanical connection device through a first transmission mechanism, and the energy storage structure is connected to the control unit signal; the energy storage structure is suitable for receiving and storing the kinetic energy transmitted by the mechanical connection device through the first transmission mechanism; A yaw drive unit connected to the energy storage structure; The yaw side wind protection system is suitable for controlling the energy storage structure to release energy when the control unit sends an emergency shutdown signal of the wind turbine and receives a failure signal, thereby driving the yaw drive unit to drive the cabin to perform emergency yaw operation until it reaches a safe position. Beneficial effect: This application adopts the above technical solution. When the emergency shutdown occurs and the main control unit or the yaw motor is in a failed state, the yaw side wind protection system can operate independently and start automatically. It mainly uses a mechanical transmission device to reduce energy input through the yaw side of the cabin to the wind, and continuously absorbs energy through the energy storage structure, thereby achieving the deceleration of the impeller of the wind turbine to prevent overspeed and subsequent safety accidents. The yaw side wind protection system provides independent redundant protection, reduces dependence on the electric drive yaw system, and thereby improves the safety and reliability of the wind turbine in extreme situations; reduces the risk of wind turbine damage caused by overspeed accidents and shortens downtime, and improves the overall economic benefits of the wind farm. The energy storage structure can not only release energy in the event of an emergency shutdown and when the main control unit or the yaw motor is in a failed state, but also continuously absorb the energy transmitted by the main shaft when the impeller of the wind turbine set is overspeeding, and convert it into power to drive the yaw of the nacelle.

[0005] Optionally, the emergency yaw operation is: the yaw drive unit drives the nacelle to rotate and perform a 90° yaw to the side facing the wind.

[0006] Optionally, the mechanical connection device includes at least: a rotating shaft fixedly connected to the main shaft.

[0007] Optionally, the yaw drive unit is connected to the nacelle via a second transmission mechanism.

[0008] Optionally, the first transmission mechanism and the second transmission mechanism both include at least one of a gear transmission mechanism, a chain transmission mechanism, a belt transmission mechanism or a hydraulic transmission mechanism.

[0009] Optionally, the energy storage structure includes: at least one of a flywheel energy storage structure, an elastic member energy storage structure or a gravity energy storage structure.

[0010] Optionally, the elastic member energy storage structure is a spring energy storage structure.

[0011] Optionally, it also includes: A yaw angle monitoring unit is connected to the control unit by signal, and the yaw angle monitoring unit is suitable for monitoring the yaw angle of the cabin, and sending an emergency yaw completion signal to the control unit when the emergency yaw operation of the cabin is completed; The reset locking unit is connected to the yaw angle monitoring unit and the yaw drive unit by signals, and the reset locking unit is connected to the cabin; the reset locking unit is suitable for resetting and stopping the yaw drive unit from driving the cabin and locking the current position of the cabin when receiving the emergency yaw completion signal sent by the yaw angle monitoring unit. Beneficial effect: The present application adopts the above technical solution to ensure that the cabin is yawed in place and reliably maintain the cabin yaw attitude to the wind.

[0012] Optionally, it also includes: The yaw platform is suitable for supporting the nacelle and providing a track for the yawing motion of the nacelle.

[0013] Optionally, the control unit is connected to the wind farm control system signal, and the control unit is suitable for sending the wind turbine emergency shutdown signal, failure signal and emergency yaw completion signal to the wind farm control system in real time. Beneficial effect: The present application adopts the above technical solution to timely and accurately grasp the status of the wind turbine through the wind farm control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a connection schematic diagram of the yaw side wind protection system provided in an embodiment of the present invention.

[0016] Description of reference numerals: 1. Impeller; 2. Main shaft; 3. Mechanical connection device; 4. First transmission mechanism; 5. Energy storage structure; 6. Yaw drive unit; 7. Control unit; 8. Yaw platform; 9. Power generation unit. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] like Figure 1A specific implementation of the yaw side wind protection system shown includes: a safety monitoring device, a speed monitoring unit, a control unit 7, a mechanical connection device 3, an energy storage structure 5, a yaw drive unit 6, a yaw angle monitoring unit, a reset locking unit and a yaw platform 8. Under normal circumstances, the impeller 1 of the wind turbine drives the main shaft 2 to rotate, and then drives the independently operated power generation unit 9 to generate electricity; the electric drive yaw system of the wind turbine is used to control the yaw side of the cabin to face the wind; the yaw side wind protection system is in standby mode. The electric drive yaw system mainly includes: a main control unit or a yaw motor. The yaw side wind protection system described in the present application is used as an independent and reliable redundant configuration to automatically take over the control to realize the yaw side of the cabin to face the wind when the wind turbine is shut down in an emergency and the electric drive yaw system fails. Figure 1 The dashed line with an arrow in the middle indicates the transmission path and direction of the signal.

[0019] The safety monitoring device is suitable for real-time monitoring of the status of the main control unit or the yaw motor of the electric drive yaw system, and sends a failure signal when the main control unit or the yaw motor is in a failure state. The speed monitoring unit is suitable for real-time monitoring of the wind speed and the rotation speed of the main shaft. The control unit 7 is signal-connected to the safety monitoring device and the speed monitoring unit. The control unit 7 is suitable for receiving the failure signal sent by the safety monitoring device and the wind speed signal sent by the speed monitoring unit, and when the wind speed exceeds the set limit, it sends an emergency shutdown signal of the wind turbine; the limit is an empirical value. The control unit 7 is also suitable for receiving the working signal sent by the yaw motor. The mechanical connection device 3 is connected to the main shaft 2 of the wind turbine, and the main shaft 2 is connected to the impeller 1 of the wind turbine. The mechanical connection device 3 is suitable for rotating with the main shaft 2 when the impeller 1 rotates. Specifically, the mechanical connection device 3 at least includes: a rotating shaft fixedly connected to the main shaft 2.

[0020] The energy storage structure 5 is connected to the mechanical connection device 3 through the first transmission mechanism 4, and the energy storage structure 5 is connected to the control unit 7 by signal; the energy storage structure 5 is suitable for receiving and storing the kinetic energy transmitted by the mechanical connection device 3 through the first transmission mechanism 4. Specifically, the energy storage structure 5 includes: at least one of a flywheel energy storage structure, an elastic member energy storage structure or a gravity energy storage structure. More specifically, the elastic member energy storage structure is a spring energy storage structure. The rotating shaft is directly or indirectly connected to the first transmission mechanism 4.

[0021] The yaw drive unit 6 is connected to the energy storage structure 5. The yaw side wind protection system is suitable for controlling the energy storage structure 5 to release energy when the control unit 7 sends an emergency shutdown signal of the wind turbine and receives a failure signal, thereby driving the yaw drive unit 6 to drive the cabin to perform an emergency yaw operation until it reaches a safe position. Specifically, the yaw drive unit 6 is connected to the cabin through a second transmission mechanism; the emergency yaw operation is: the yaw drive unit 6 drives the cabin to rotate and perform a 90° yaw side wind.

[0022] More specifically, the first transmission mechanism 4 and the second transmission mechanism both include at least one of a gear transmission mechanism, a chain transmission mechanism, a belt transmission mechanism or a hydraulic transmission mechanism.

[0023] The yaw angle monitoring unit is connected to the control unit 7 by signal. The yaw angle monitoring unit is suitable for monitoring the yaw angle of the cabin, and when the emergency yaw operation of the cabin is completed, it sends an emergency yaw completion signal to the control unit 7. The reset locking unit is connected to the yaw angle monitoring unit and the yaw drive unit 6 by signal, and the reset locking unit is connected to the cabin; the reset locking unit is suitable for resetting and stopping the drive of the cabin by the yaw drive unit 6 and locking the current position of the cabin when receiving the emergency yaw completion signal sent by the yaw angle monitoring unit. The yaw platform 8 is suitable for supporting the cabin and the yaw motor, and providing a track for the yaw movement of the cabin.

[0024] Furthermore, the control unit 7 is connected to the wind farm control system signal, and the control unit 7 is suitable for sending the wind turbine emergency shutdown signal, failure signal and emergency yaw completion signal to the wind farm control system in real time.

[0025] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A yaw side wind protection system, characterized in that: include: A safety monitoring device, adapted to monitor the status of a main control unit or a yaw motor of an electric drive yaw system in real time, and to send a failure signal when the main control unit or the yaw motor is in a failure state; Speed ​​monitoring unit, suitable for real-time monitoring of wind speed; A control unit (7) is signal-connected to the safety monitoring device and the speed monitoring unit, the control unit (7) being adapted to receive a failure signal sent by the safety monitoring device and a wind speed signal sent by the speed monitoring unit, and to send an emergency shutdown signal of the wind turbine when the wind speed exceeds a set limit; A mechanical connection device (3) connected to a main shaft (2) of the wind turbine generator set, the main shaft (2) being connected to an impeller (1) of the wind turbine generator set, the mechanical connection device (3) being adapted to rotate along with the main shaft (2) when the impeller (1) rotates; An energy storage structure (5) is connected to the mechanical connection device (3) via a first transmission mechanism (4), and the energy storage structure (5) is signal-connected to a control unit (7); the energy storage structure (5) is suitable for receiving and storing kinetic energy transmitted by the mechanical connection device (3) via the first transmission mechanism (4); A yaw drive unit (6) connected to the energy storage structure (5); The yaw side wind protection system is suitable for controlling the energy storage structure (5) to release energy when the control unit (7) sends an emergency shutdown signal of the wind turbine set and receives a failure signal, thereby driving the yaw drive unit (6) to drive the nacelle to perform an emergency yaw operation until a safe position is reached.

2. The yaw side wind protection system according to claim 1, characterized in that: The emergency yaw operation is as follows: the yaw drive unit (6) drives the nacelle to rotate and perform a 90° yaw to the side facing the wind.

3. The yaw side wind protection system according to claim 1, characterized in that: The mechanical connection device (3) comprises at least: a rotating shaft fixedly connected to the main shaft (2).

4. The yaw side wind protection system according to any one of claims 1 to 3, characterized in that: The yaw drive unit (6) is connected to the nacelle via a second transmission mechanism.

5. The yaw side wind protection system according to claim 4, characterized in that: The first transmission mechanism (4) and the second transmission mechanism both comprise at least one of a gear transmission mechanism, a chain transmission mechanism, a belt transmission mechanism or a hydraulic transmission mechanism.

6. The yaw side wind protection system according to any one of claims 1 to 3, characterized in that: The energy storage structure (5) comprises: at least one of a flywheel energy storage structure, an elastic member energy storage structure or a gravity energy storage structure.

7. The yaw side wind protection system according to claim 6, characterized in that: The elastic member energy storage structure is a spring energy storage structure.

8. The yaw side wind protection system according to any one of claims 1 to 3, characterized in that: Also includes: A yaw angle monitoring unit connected to the control unit (7) by signal, the yaw angle monitoring unit being adapted to monitor the yaw angle of the cabin and sending an emergency yaw completion signal to the control unit (7) when the emergency yaw operation of the cabin is completed; A reset locking unit is signal-connected to the yaw angle monitoring unit and the yaw drive unit (6), and the reset locking unit is connected to the cabin; the reset locking unit is adapted to reset and stop the yaw drive unit (6) driving the cabin and lock the current position of the cabin when receiving an emergency yaw completion signal sent by the yaw angle monitoring unit.

9. The yaw side wind protection system according to any one of claims 1 to 3, characterized in that: Also includes: The yaw platform (8) is suitable for supporting the nacelle and providing a track for the nacelle to move in a yaw manner.

10. The yaw side wind protection system according to claim 8, characterized in that: The control unit (7) is connected to the wind farm control system signal, and the control unit (7) is suitable for sending the wind turbine emergency shutdown signal, failure signal and emergency yaw completion signal to the wind farm control system in real time.

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