Yaw control loop of wind turbine
By introducing independent safety monitoring devices into the yaw control circuit of the wind turbine, monitoring and automatically revoking abnormal yaw commands, the abnormal output problems of yaw system caused by PLC failure and relay abnormality are solved, the safety of the yaw control circuit is improved, and excessive cable twisting and twisting are prevented.
Patent Information
- Application Number
- CN202421912569.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-08
AI Technical Summary
In the yaw control circuit of the wind turbine, the PLC controller fails or the relay contact cannot be disconnected after being suctioned, resulting in abnormal output of the yaw system and the nacelle continues to rotate in one direction, resulting in excessive twisting of the cable and possible twisting.
A yaw control circuit with safety monitoring device is designed. The safety monitoring device is independent of the yaw PLC module and the yaw torsion cable limit switch. By monitoring the yaw command and relay status, the abnormal command is automatically cancelled to prevent one-way rotation.
Even if the PLC module, relay and torsion cable limit switch are all invalid, the safety monitoring device can still effectively protect the yaw circuit, prevent abnormal operation, and ensure the safety of the cabin-tower section cables.
Smart Images
Figure CN222936871U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wind turbines, in particular to a yaw control loop of a wind turbine. Background Art
[0002] In the yaw control loop of a wind turbine, the general situation is: the PLC controller is commonly used to control the left / right yaw or stop yaw of the nacelle of the wind turbine. When the nacelle needs to yaw left, the PLC left yaw port sends a high level, the left yaw control relay coil is energized, the control relay contacts are energized, and the yaw execution servo loop drives the nacelle to rotate left; when the nacelle needs to yaw right, the PLC right yaw port sends a high level, the right yaw control relay coil is energized, the control relay contacts are energized, and the yaw execution servo loop drives the nacelle to rotate right. When the nacelle yaws left / right, the cable of the nacelle-tower section will also twist left / right. In order to prevent excessive twisting, a yaw twist cable limit switch is configured to monitor the twisting of the cable of the nacelle-tower section. When the left torsion is excessive, the left limit switch of the yaw twist cable limit switch activates and disconnects the left yaw control relay, and the left yaw execution servo loop stops; when the right torsion is excessive, the right limit switch of the yaw twist cable limit switch activates and disconnects the right yaw control relay, and the right yaw execution servo loop stops.
[0003] When the PLC controller in the yaw control loop of the wind turbine fails when it is in the left / right yaw command, such as "freezing"; or the left / right yaw relay contacts fail after being energized and cannot be disconnected, it can cause the left / right yaw command in the yaw system to continue to output abnormally and cannot be cancelled. The yaw execution servo loop drives the cabin to rotate continuously and abnormally in one direction until the internal convex corner of the yaw twist cable switch is supported and the limit switch of the yaw twist cable switch is activated. The left / right limit switch inside the yaw twist cable switch becomes disconnected, which can "temporarily" disconnect the left / right yaw command on the yaw execution servo loop, and the yaw execution servo loop stops the yaw action. If the external wind conditions are strong at this time, the wind turbine impeller will swing with the wind turbine cabin in the original rotation direction under the action of external unbalanced force, and the yaw cable switch will be dragged with the swing of the cabin. The yaw cable switch will be dragged and the convex corner support state will be changed to a non-support state, and the limit switch activation will be cancelled. The left / right limit switch inside the yaw cable switch will return to the on state, and the left / right yaw command will be re-applied to the yaw execution servo circuit again; the yaw execution servo circuit will return to unidirectional continuous and abnormal rotation. At this time, the protection against excessive torsion of the cable in the cabin-tower section will completely fail, resulting in serious consequences such as the cable in the cabin-tower section being twisted off.
[0004] Therefore, a yaw control protection circuit is needed to improve the safety of the yaw control loop. Utility Model Content
[0005] Regarding the above problems existing in the prior art, the purpose of the present utility model is to provide a yaw control circuit for a wind turbine to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the present utility model provides the following technical solutions:
[0007] A yaw control circuit for a wind turbine includes a yaw cable-twisting limit switch TS1, a yaw PLC module U1, and a safety monitoring device T1; the lower end of the contact of the left limit switch TS1-L of the yaw cable-twisting limit switch TS1 is connected to the upper end of the normally open contact of the left yaw control relay K1 and the control contact port 9 of the safety monitoring device T1 at the same time. The lower end of the normally open contact of the left yaw control relay K1 is connected to the control contact port 1 and the monitoring point port 5 of the safety monitoring device T1. The control contact port 2 of the safety monitoring device T1 is electrically connected to the yaw execution servo circuit, and the monitoring point port 13 of the safety monitoring device T1 is connected to the left yaw control port 1 of the yaw PLC module U1;
[0008] The lower end of the contact of the right limit switch TS1-R of the yaw cable-twisting limit switch TS1 is connected to the upper end of the normally open contact of the right yaw control relay K2 and the control contact port 11 of the safety monitoring device T1 at the same time. The lower end of the normally open contact of the right yaw control relay K2 is connected to the control contact port 3 and the monitoring point port 7 of the safety monitoring device T1. The control contact port 4 of the safety monitoring device T1 is electrically connected to the yaw execution servo circuit, and the monitoring point port 15 of the safety monitoring device T1 is connected to the right yaw control port 2 of the yaw PLC module U1;
[0009] Port 1 of the yaw PLC module U1 is connected to the A1 end of the left yaw control relay K1, and port 2 of the yaw PLC module U1 is connected to the A1 end of the right yaw control relay K2.
[0010] As a further solution of the present utility model: the upper end of the contact of the left limit switch TS1-L of the yaw cable-twisting limit switch TS1 is connected to the 24V power supply, and the upper end of the contact of the right limit switch TS1-R of the yaw cable-twisting limit switch TS1 is connected to the 24V power supply.
[0011] As a further solution of the present utility model: the control contact port 2 of the safety monitoring device T1 is connected to the left yaw command input end in the yaw execution servo circuit, and the control contact port 4 of the safety monitoring device T1 is connected to the right yaw command input end in the yaw execution servo circuit.
[0012] As a further solution of the present utility model: The control contact port 10 of the safety monitoring device T1 is connected to the left yaw command input terminal in the yaw execution servo loop; the control contact port 12 of the safety monitoring device T1 is connected to the right yaw command input terminal in the yaw execution servo loop.
[0013] As a further solution of the present utility model: The monitoring point ports 6 and 8 of the safety monitoring device T1 are grounded.
[0014] As a further solution of the present utility model: The A2 terminals of the left yaw control relay K1 and the right yaw control relay K2 are both grounded.
[0015] Compared with the prior art, the beneficial effects of the present utility model are:
[0016] By adopting a yaw control loop with a safety monitoring device in the present utility model, since the safety monitoring device is independent of the yaw PLC module and the yaw cable torsion limit switch, even when the yaw PLC module, the yaw control relay, and the yaw cable torsion limit switch all fail, it can still effectively protect the abnormal operation of the yaw loop. Description of the Drawings
[0017] Figure 1 It is a circuit schematic diagram of a yaw control loop of a wind turbine disclosed in the embodiment. Detailed Embodiment
[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0019] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0020] Please refer to Figure 1, a yaw control loop for a wind turbine, comprising a yaw cable torsion limit switch TS1, a yaw PLC module U1, and a safety monitoring device T1; the upper end of the contact of the left limit switch TS1-L of the yaw cable torsion limit switch TS1 is connected to a 24V power supply, and the lower end of the contact of the left limit switch TS1-L of the yaw cable torsion limit switch TS1 is connected to the upper end of the normally open contact of the left yaw control relay K1 and the control contact port 9 of the safety monitoring device T1 at the same time. The lower end of the normally open contact of the left yaw control relay K1 is connected to the control contact port 1 and the monitoring point port 5 of the safety monitoring device T1. The control contact port 2 of the safety monitoring device T1 is connected to the left yaw command input end in the yaw execution servo loop. The monitoring point port 13 of the safety monitoring device T1 is connected to the left yaw control port 1 of the yaw PLC module U1 and monitors its status. Under normal left yaw conditions, the control contact port 1 and the control contact port 2 of the safety monitoring device T1 are connected. When the left yaw command of the yaw control relay K1 monitored by the monitoring point port 5 is abnormal, the control contact port 1 and the control contact port 2 of T1 are disconnected, and the left yaw command of the yaw execution servo loop is cancelled.
[0021] The upper end of the contact of the right limit switch TS1-R of the yaw cable torsion limit switch TS1 is connected to a 24V power supply, and the lower end of the contact of the right limit switch TS1-R of the yaw cable torsion limit switch TS1 is connected to the upper end of the normally open contact of the right yaw control relay K2 and the control contact port 11 of the safety monitoring device T1 at the same time. The lower end of the normally open contact of the right yaw control relay K2 is connected to the control contact port 3 and the monitoring point port 7 of the safety monitoring device T1. The control contact port 4 of the safety monitoring device T1 is connected to the right yaw command input end in the yaw execution servo loop. The monitoring point port 15 of the safety monitoring device T1 is connected to the right yaw control port 2 of the yaw PLC module U1 and monitors its status. Under normal right yaw conditions, the control contact port 3 and the control contact port 4 of the safety monitoring device T1 are connected. Under normal right yaw conditions, the control contact port 3 and the port 4 of the safety monitoring device T1 are connected. When the right yaw command of the yaw control relay K2 monitored by the monitoring point port 7 is abnormal, the control contact port 3 and the port 4 of T1 are disconnected, and the right yaw command of the yaw execution servo loop is cancelled.
[0022] The left / right yaw ports of the PLC module U1 are respectively connected to control the coils of the left / right yaw control relays. The contacts of the yaw control relays (K1, K2) are connected and control the start and stop of the yaw execution servo loop. It also includes a safety monitoring device T1 to monitor the yaw commands of the left yaw control relay K1, the right yaw control relay K2, and / or the PLC module U1 and control the final yaw command output to the yaw execution servo loop.
[0023] The control contact port 10 of the safety monitoring device T1 is connected to the left yaw command input terminal in the yaw execution servo loop; the control contact port 12 of the safety monitoring device T1 is connected to the right yaw command input terminal in the yaw execution servo loop;
[0024] The monitoring point ports 6 and 8 of the safety monitoring device T1 are grounded;
[0025] The port 1 of the yaw PLC module U1 is connected to the A1 terminal of the left yaw control relay K1, the port 2 of the yaw PLC module U1 is connected to the A1 terminal of the right yaw control relay K2, and the A2 terminals of the left yaw control relay K1 and the right yaw control relay K2 are both grounded; when the wind turbine needs to yaw to the left, the port 1 is at a high level, and the coil of the left yaw control relay K1 is energized. When the wind turbine needs to yaw to the right, the port 2 is at a high level, and the coil of the right yaw control relay K2 is energized.
[0026] The safety monitoring device can monitor the time data of continuously executing the left / right yaw command. If it exceeds the set value, it controls to change the yaw command output to the yaw execution servo loop. The safety monitoring device T1 can monitor the time data of continuously executing the single-direction left / right yaw command. When it exceeds the set value t, it triggers an action to disconnect the left yaw / right yaw command. The safety monitoring device T1 can monitor the time data of continuously executing the single-direction left / right yaw command. When it exceeds the set value t, it triggers an action to disconnect the left yaw / right yaw command and then outputs the right yaw / left yaw command.
[0027] When the left yaw command of the yaw control relay K1 or / and the PLC module U1 monitored by the monitoring point port 5 is abnormal, the control contact ports 1 and 2 of the safety monitoring device T1 are disconnected, and the left yaw command of the yaw execution servo loop is cancelled; the safety monitoring device T1 can control the contact ports 11 and 12 to be connected for a period of time as needed to issue a right yaw command.
[0028] When the yaw command of the yaw control relay K2 and the right yaw port of the PLC module U1 monitored by the monitoring point port 7 is abnormal, the control contact ports 3 and 4 of T1 are disconnected; the right yaw command of the yaw execution servo loop is cancelled; the safety monitoring device T1 can control the contact ports 9 and 10 to be connected for a period of time as needed to issue a left yaw command.
[0029] The safety monitoring device can monitor the time data of continuously executing the single-direction left / right yaw command for multiple accumulations. If the time difference between the left and right yaw commands exceeds the set value, it triggers an action.
[0030] The safety monitoring device can control the yaw execution servo loop to stop and can also generate a right yaw or left yaw action command for the yaw execution servo loop
[0031] The utility model adopts a yaw control loop with a safety monitoring device. Since the safety monitoring device is independent of the yaw PLC module and the yaw cable torsion limit switch, even when the yaw PLC module, the yaw control relay and the yaw cable torsion limit switch all fail, it can still effectively protect the abnormal operation of the yaw loop.
[0032] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, and any reference signs in the claims should not be regarded as limiting the claims involved.
[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A wind turbine yaw control loop, characterized in that: It includes a yaw twist cable limit switch TS1, a yaw PLC module U1 and a safety monitoring device T1; the lower end of the contact of the left limit switch TS1-L of the yaw twist cable limit switch TS1 is connected to the upper end of the normally open contact of the left yaw control relay K1 and the control contact port 9 of the safety monitoring device T1 at the same time, the lower end of the normally open contact of the left yaw control relay K1 is connected to the control contact port 1 and the monitoring point port 5 of the safety monitoring device T1, the control contact port 2 of the safety monitoring device T1 is electrically connected to the yaw execution servo circuit, and the monitoring point port 13 of the safety monitoring device T1 is connected to the left yaw control port 1 of the yaw PLC module U1; The lower end of the contact of the right limit switch TS1-R of the yaw twist cable limit switch TS1 is connected to the upper end of the normally open contact of the right yaw control relay K2 and the control contact port 11 of the safety monitoring device T1 at the same time, the lower end of the normally open contact of the right yaw control relay K2 is connected to the control contact port 3 and the monitoring point port 7 of the safety monitoring device T1, the control contact port 4 of the safety monitoring device T1 is electrically connected to the yaw execution servo loop, and the monitoring point port 15 of the safety monitoring device T1 is connected to the right yaw control port 2 of the yaw PLC module U1; Port 1 of the yaw PLC module U1 is connected to the A1 end of the left yaw control relay K1, and port 2 of the yaw PLC module U1 is connected to the A1 end of the right yaw control relay K2.
2. A wind turbine yaw control loop according to claim 1, characterized in that: The upper end of the contact of the left limit switch TS1-L of the yaw twist cable limit switch TS1 is connected to a 24V power supply, and the upper end of the contact of the right limit switch TS1-R of the yaw twist cable limit switch TS1 is connected to a 24V power supply.
3. A wind turbine yaw control loop according to claim 2, characterized in that: The control contact port 2 of the safety monitoring device T1 is connected to the left yaw command input terminal in the yaw execution servo loop, and the control contact port 4 of the safety monitoring device T1 is connected to the right yaw command input terminal in the yaw execution servo loop.
4. A wind turbine yaw control loop according to claim 3, characterized in that: The control contact port 10 of the safety monitoring device T1 is connected to the left yaw command input terminal in the yaw execution servo loop; the control contact port 12 of the safety monitoring device T1 is connected to the right yaw command input terminal in the yaw execution servo loop.
5. A wind turbine yaw control loop according to claim 4, characterized in that: The monitoring point port 6 and the monitoring point port 8 of the safety monitoring device T1 are grounded.
6. A wind turbine yaw control loop according to claim 5, characterized in that: The A2 end of the left yaw control relay K1 and the A2 end of the right yaw control relay K2 are both grounded.