Yaw control device of wind turbine
By adopting the parallel main loop structure and control module detection function in the yaw control device of the wind turbine, the problems of damage to the main contact of the yaw contactor and abnormally charged yaw motor are solved, and the safe and stable operation of the wind turbine is achieved.
Patent Information
- Application Number
- CN202520820226.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2035-04-28
AI Technical Summary
In the existing wind turbine yaw control devices, the left yaw contactor or the right yaw contactor is prone to damage to the main contact during operation, resulting in abnormal continuous liveness of the yaw motor, causing excessive twisting of the cable between the nacelle and the tower.
A wind turbine yaw control device is designed, and a main circuit structure is used in parallel with the yaw main contactor and the left yaw contactor or the right yaw contactor. The control module detects the closing and disconnection abnormalities of the contactor to ensure that the power supply of the yaw motor is cut off.
It effectively reduces the probability of the main contact damage during the operation of the left yaw contactor or the right yaw contactor, ensures the safe operation of the wind turbine, and prevents abnormally charged by the yaw motor.
Smart Images
Figure CN222962981U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind turbines, and specifically relates to a yaw control device for a wind turbine. Background Art
[0002] Large wind turbines generally adopt horizontal axes. To ensure power generation efficiency, the axis of rotation of the wind turbine impeller must be approximately aligned with the wind direction during power generation.
[0003] The wind turbine is equipped with a yaw system that operates with changes in the wind direction: when the external wind direction changes and the absolute value of the wind alignment deviation angle (the angle between the wind turbine impeller rotation plane and the actual wind direction) is greater than a preset angle 1, the impeller starts to yaw left (or right) with the tower axis as the rotation axis. When the absolute value of the wind alignment deviation angle is greater than a preset angle 2, the yaw stops.
[0004] The yaw system of the wind turbine (also known as the wind alignment device) functions to quickly and smoothly face the wind when the direction of the wind speed vector changes, so that the wind turbine can obtain the maximum wind energy. The yaw control device of the wind turbine generally consists of a left yaw contactor, a right yaw contactor, a yaw motor, a left yaw enable switch, a right yaw enable switch, a control module, a yaw cam switch, a wind speed and direction sensor, etc.
[0005] When the control module receives that the wind speed measured by the wind speed and direction sensor of the wind turbine reaches above the effective wind speed, according to the wind direction deviation value, the control module controls the main contact of the yaw contactor to close or open through the yaw control relay (yaw enable switch), so that the yaw motor rotates forward / backward or stops.
[0006] The stability of the yaw contactor affects the safety of the yaw system. If the yaw contactor cannot be normally disconnected, the abnormal continuous energization of the yaw motor will cause the nacelle (impeller) to continuously rotate in one direction, which will cause excessive twisting of the cable between the nacelle and the tower. During actual use, the main contacts of the left yaw contactor or the right yaw contactor are frequently disconnected and connected, resulting in wear of the main contacts, and even overload operation, causing the contacts of the yaw contactor to be damaged, heated, and even welded together. Even after the enable of the left yaw contactor (right yaw contactor) is revoked, the main contact of the yaw contactor remains closed, and the yaw motor is abnormally energized.
[0007] To reduce the probability of "jamming" of the left yaw contactor or the right yaw contactor, and to solve the abnormal situation where the yaw motor still rotates while energized after the "jamming" of the left yaw contactor or the right yaw contactor occurs, it is very necessary to adopt a yaw control device for a wind turbine. Summary of the Utility Model
[0008] In view of the above problems existing in the prior art, the purpose of the present utility model is to provide a yaw control device for a wind turbine, which effectively reduces the probability of damage to the main contacts during the operation of the left yaw contactor or the right yaw contactor, and can detect abnormal closing and abnormal opening of the active switches of the yaw main contactor, the left yaw contactor and the right yaw contactor, ensuring the safe operation of the wind turbine.
[0009] In order to achieve the above purpose, the technical solution adopted by the present utility model is:
[0010] A yaw control device for a wind turbine includes a yaw main circuit and a yaw control circuit. In the yaw main circuit, the active switches of the left yaw contactor and the right yaw contactor are connected in parallel, one end is connected to the yaw motor, and the other end is connected to the output end of the active switch of the yaw main contactor. The input end of the active switch of the yaw main contactor is connected to a three-phase power supply.
[0011] The yaw control circuit includes a control power supply, a left yaw enable switch, a right yaw enable switch and a control module. The input end of the action switch of the left yaw enable switch is connected to the positive pole of the control power supply, and the output end is simultaneously connected to the input end of the control coil of the yaw main contactor and the input end of the control coil of the left yaw contactor. The input end of the action switch of the right yaw enable switch is connected to the positive pole of the control power supply, and the output end is simultaneously connected to the input end of the control coil of the yaw main contactor and the input end of the control coil of the right yaw contactor. The output ends of the control coils of the left yaw contactor, the right yaw contactor and the yaw main contactor are all connected to the negative pole of the control power supply.
[0012] The control module includes a first control output end, a second control output end, a first control input end and a second control input end. The two ends of the control coil of the left yaw enable switch are respectively connected to the first control output end and the negative pole of the control power supply. The two ends of the control coil of the right yaw enable switch are respectively connected to the second control output end and the negative pole of the control power supply.
[0013] The normally open switches of the left yaw contactor and the right yaw contactor are connected in parallel, one end is connected to the second control input end, and the other end is connected to the output end of the normally open switch of the yaw main contactor. The input end of the normally open switch of the yaw main contactor is connected to the positive pole of the control power supply.
[0014] The normally closed switches of the yaw main contactor, the left yaw contactor and the right yaw contactor are connected in series-parallel, one end is connected to the first control input end, and the other end is connected to the positive pole of the control power supply.
[0015] As a further improvement of the above technical solution:
[0016] The yaw main circuit further includes a yaw main circuit breaker. The input end of the yaw main circuit breaker is connected to a three-phase power supply, and the output end of the yaw main circuit breaker is connected to the input end of the active switch of the yaw main contactor.
[0017] The yaw control circuit further includes a yaw cam switch. The yaw cam switch includes a left limit switch and a right limit switch. The left limit switch and the right limit switch are normally closed switches. One end of the left limit switch is connected to the positive pole of the control power supply, and the other end is connected to the input end of the active switch of the left yaw enabling switch. One end of the right limit switch is connected to the positive pole of the control power supply, and the other end is connected to the input end of the active switch of the right yaw enabling switch.
[0018] The yaw control circuit further includes a first diode and a second diode. The output end of the active switch of the left yaw enabling switch is connected to the positive pole of the first diode and the input end of the control coil of the left yaw contactor. The output end of the right yaw enabling switch is connected to the positive pole of the second diode and the input end of the control coil of the right yaw contactor. The negative poles of the first diode and the second diode are both connected to the input end of the control coil of the yaw main contactor.
[0019] The left yaw enabling switch and the right yaw enabling switch are relays.
[0020] The control module is a PLC module or a single-chip microcomputer.
[0021] The active switch of the left yaw contactor and the active switch of the right yaw contactor are interlocked through a mechanical interlock structure. When one of the active switch of the left yaw contactor and the active switch of the right yaw contactor is disconnected, the other must be closed.
[0022] When the active switch of the left yaw contactor is closed, the normally open switch of the left yaw contactor is closed and the normally closed switch of the left yaw contactor is disconnected. When the active switch of the right yaw contactor is closed, the normally open switch of the right yaw contactor is closed and the normally closed switch of the right yaw contactor is disconnected. When the active switch of the yaw main contactor is closed, the normally open switch of the yaw main contactor is closed and the normally closed switch of the yaw main contactor is disconnected.
[0023] The control device further includes a yaw motor protector. The yaw motor protector is connected to the yaw main circuit, and the yaw motor protector cuts off the power supply of the yaw motor by disconnecting.
[0024] When the active switch of the left yaw contactor is closed, the impeller of the wind turbine yaws to the left along the tower axis. When the active switch of the right yaw contactor is closed, the impeller of the wind turbine yaws to the right along the tower axis.
[0025] The beneficial effects of the present utility model are:
[0026] (1)Adopt the main circuit structure with two-point breaking (i.e., the yaw main circuit) where the yaw main contactor acts jointly with the left yaw contactor or the right yaw contactor, which effectively reduces the probability of damage to the main contacts (the actively operating switches) during the operation of the left yaw contactor or the right yaw contactor. Even when the left yaw contactor or the right yaw contactor is damaged, the yaw main contactor can timely cut off the yaw motor circuit.
[0027] (2)The control device can detect the abnormal closing and abnormal opening of the actively operating switches of the yaw main contactor, the left yaw contactor, and the right yaw contactor. In this way, when the main contacts of the left yaw contactor or the right yaw contactor are damaged by welding or cannot be disconnected, etc., the device can effectively cut off the power supply of the yaw motor to ensure the safe operation of the wind turbine. Description of the Drawings
[0028] Figure 1 It is a schematic structural diagram of the yaw main circuit of an embodiment of the present utility model.
[0029] Figure 2 It is a schematic structural diagram of the yaw control circuit of an embodiment of the present utility model.
[0030] Figure 3 It is a schematic structural diagram of the control module of an embodiment of the present utility model.
[0031] Reference Numerals: K1, left yaw enable switch; K2, right yaw enable switch; D1, first diode; D2, second diode; TS, yaw cam switch; TS1, left limit switch; TS2, right limit switch; U1, control module; DO1, first control output terminal; DO2, second control output terminal; DI1, first control input terminal; D12, second control input terminal; KM1, left yaw contactor; KM2, right yaw contactor; KM0, yaw main contactor; QF1, yaw main circuit breaker; M, yaw motor; UVW, three-phase power supply. Detailed Embodiments
[0032] The following will describe in detail the detailed embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the detailed embodiments described herein are only for explaining and illustrating the present utility model, and are not used to limit the present utility model.
[0033] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface of", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be oriented "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.
[0034] A yaw control device for a wind turbine, as Figures 1 to 3 shown, includes a yaw control circuit, a yaw main circuit, and a yaw motor protector.
[0035] The control device includes a left yaw contactor KM1, a right yaw contactor KM2, a yaw main contactor KM0, a left yaw enable switch K1, and a right yaw enable switch K2, etc. Among them, the left yaw contactor KM1, the right yaw contactor KM2, and the yaw main contactor KM0 all include an active switch, a control coil, a normally closed switch, and a normally open switch. The left yaw enable switch K1 and the right yaw enable switch K2 each include a control coil and an action switch. Among them, Figure 1 the active switches of the left yaw contactor KM1, the right yaw contactor KM2, and the yaw main contactor KM0 are connected to the yaw main circuit in Figure 2 the control coils of the left yaw contactor KM1, the right yaw contactor KM2, and the yaw main contactor KM0, and the action switches of the left yaw enable switch K1 and the right yaw enable switch K2 are connected to the yaw control circuit in Figure 3 the normally closed switches, normally open switches of the left yaw contactor KM1, the right yaw contactor KM2, and the yaw main contactor KM0, and the control coils of the left yaw enable switch K1 and the right yaw enable switch K2 are connected to the circuit in
[0036] The left yaw enable switch K1 and the right yaw enable switch K2 are relays. When the control coil of the left yaw enable switch K1 (or the right yaw enable switch K2) is energized, the action switch of the left yaw enable switch K1 (or the right yaw enable switch K2) closes; when the control coil of the left yaw enable switch K1 (or the right yaw enable switch K2) is de-energized, the action switch of the left yaw enable switch K1 (or the right yaw enable switch K2) opens. Similarly, when the control coil of the yaw main contactor KM0 (or the left yaw contactor KM1 or the right yaw contactor KM2) is energized, the main action switch of the yaw main contactor KM0 (or the left yaw contactor KM1 or the right yaw contactor KM2) closes; when the control coil of the yaw main contactor KM0 (or the left yaw contactor KM1 or the right yaw contactor KM2) is de-energized, the main action switch of the yaw main contactor KM0 (or the left yaw contactor KM1 or the right yaw contactor KM2) opens.
[0037] The yaw main circuit is as Figure 1 shown, and includes a left yaw contactor KM1, a right yaw contactor KM2, a yaw main contactor KM0, and a yaw main circuit breaker QF1. The input end of the yaw main circuit breaker QF1 is connected to the three-phase power supply UVW, the output end of the yaw main circuit breaker QF1 is connected to the input end of the yaw main contactor KM0, the output end of the yaw main contactor KM0 is connected to the input ends of the left yaw contactor KM1 and the right yaw contactor KM2, and the output ends of the left yaw contactor KM1 and the right yaw contactor KM2 are connected to the yaw motor M.
[0038] In other words, in the yaw main circuit, the yaw main circuit breaker QF1 and the yaw main contactor KM0 are connected in series, and the left yaw contactor KM1 and the right yaw contactor KM2 are connected in parallel.
[0039] The yaw control circuit is as Figure 2 and 3 shown, and includes a control power supply, a left yaw enable switch K1, a right yaw enable switch K2, a first diode D1, a second diode D2, a yaw cam switch TS, and a control module U1. The yaw cam switch TS includes a left limit switch TS1 and a right limit switch TS2, and the left limit switch TS1 and the right limit switch TS2 are normally closed switches.
[0040] The positive pole of the control power supply is connected to the input end of the left yaw enable switch K1 through the left limit switch TS1 of the yaw cam switch TS. In other words, one end of the left limit switch TS1 is connected to the positive pole of the control power supply, and the other end is connected to the input end of the left yaw enable switch K1. The output end of the left yaw enable switch K1 is connected to the positive pole of the first diode D1 and the enable input end of the left yaw contactor KM1. The negative pole of the first diode D1 is connected to the enable input end of the yaw main contactor KM0. The enable output end of the left yaw contactor KM1 is connected to the negative pole of the control power supply. The enable output end of the yaw main contactor KM0 is connected to the negative pole of the control power supply. The voltage of the control power supply generally adopts 24V.
[0041] Similarly, the positive pole of the control power supply is also connected to the input end of the right yaw enable switch K2 through the right limit switch TS2 of the yaw cam switch TS. In other words, one end of the right limit switch TS2 is connected to the positive pole of the control power supply, and the other end is connected to the input end of the right yaw enable switch K2. The output end of the right yaw enable switch K2 is connected to the positive pole of the second diode D2 and the enable input end of the right yaw contactor KM2. The negative pole of the second diode D2 is connected to the enable input end of the yaw main contactor KM0. The enable output end of the right yaw contactor KM2 is connected to the negative pole of the control power supply.
[0042] The control module U1 includes a first control output end DO1, a second control output end DO2, a first control input end DI1, and a second control input end DI2.
[0043] The first control output end DO1 of the control module U1 is connected to the input end of the control coil of the left yaw enable switch K1. The second control output end DO2 is connected to the input end of the control coil of the right yaw enable switch K2. The output ends of the control coils of the left yaw enable switch K1 and the right yaw enable switch K2 are connected to the negative pole of the common power supply of the control module, that is, connected to the negative pole of the control power supply.
[0044] The positive pole of the control power supply is connected to the input ends of the auxiliary normally closed contact (normally closed switch) and the auxiliary normally open contact (normally open switch) of the yaw main contactor KM0. The output end of the auxiliary normally closed contact of the yaw main contactor KM0 is connected to the input end of the auxiliary normally closed contact of the left yaw contactor KM1. The output end of the auxiliary normally closed contact of the left yaw contactor KM1 is connected to the input end of the auxiliary normally closed contact of the right yaw contactor KM2. The output end of the auxiliary normally closed contact of the right yaw contactor KM2 is connected to the first control input end DI1 of the control module U1.
[0045] The output terminal of the auxiliary normally open contact of the yaw main contactor KM0 is connected to the input terminals of the auxiliary normally open contacts of the left yaw contactor KM1 and the right yaw contactor KM2. The output terminals of the auxiliary normally open contacts of the left yaw contactor KM1 and the right yaw contactor KM2 are connected to the second control input terminal DI2 of the control module U1.
[0046] Both the first control input terminal DI1 and the second control input terminal DI2 are contactor status detection ports.
[0047] The control module U1 is generally a PLC module or a single-chip microcomputer.
[0048] A mechanical interlock structure is adopted between the main action switches of the left yaw contactor KM1 and the right yaw contactor KM2, that is, when one of the left yaw contactor KM1 and the right yaw contactor KM2 is disconnected, the other must be closed, and vice versa. The mechanical interlock structure between the left yaw contactor KM1 and the right yaw contactor KM2 is a mechanical structure used to ensure that the two contactors will not be closed simultaneously. Its main purpose is to prevent power short-circuit and improve the safety of the electrical system. The mechanical interlock structure realizes the interlock between the two contactors through a mechanical lever or a linkage mechanism. When one contactor is closed, the mechanical interlock structure will prevent the other contactor from closing. For example, some mechanical interlock structures adopt a seesaw structure. When the clapper of one contactor moves, it will push one end of the seesaw, making the other end of the seesaw approach the clapper of the other contactor, thus restricting its movement. The structure of the mechanical interlock device usually includes the following parts: Bracket: used to fix the entire interlock device. Control board or seesaw: used to realize the interlock action between the two contactors. Elastic components (such as springs): used to reset the control board or seesaw to ensure the reliability of the interlock device. Limit bosses and locking ports: used to limit the movement range of the control board to ensure the accuracy of the interlock. The mechanical interlock device is widely used in occasions where it is necessary to prevent the two contactors from closing simultaneously, such as the forward and reverse control circuits of motors. In these circuits, the mechanical interlock device can effectively avoid power short-circuit caused by misoperation. In other words, the mechanical interlock structure in this solution can adopt the devices in the prior art.
[0049] The input terminal of the yaw motor protector is connected to the output terminals of the left yaw contactor KM1 and the right yaw contactor KM2. The yaw motor protectors and the yaw motors M are in one-to-one correspondence. The yaw motor protector is used to protect the yaw motor M. When faults such as motor overcurrent, phase loss, and coil grounding occur, the yaw motor protector will trip to cut off the power supply of the yaw motor M. The number of yaw motors M used in different yaw systems is different, generally there are 1, 2, 4, 6, 8, etc. The yaw motor protector can also adopt the products and solutions in the prior art.
[0050] In the yaw main circuit, the phase sequences at the output terminals of the left yaw contactor KM1 and the right yaw contactor KM2 are opposite to each other, so that the rotation direction of the yaw motor M when the left yaw contactor KM1 is closed is opposite to that when the right yaw contactor KM2 is closed. When the left yaw contactor KM1 is closed, the wind turbine impeller yaws to the left along the tower axis; when the right yaw contactor KM2 is closed, the wind turbine impeller yaws to the right along the tower axis. By changing the closed states of the left yaw contactor KM1 and the right yaw contactor KM2, the phase sequences output by the main contacts of the left yaw contactor KM1 and the right yaw contactor KM2 are changed, thereby changing the power supply phase sequence of the yaw motor M. For example, when the left yaw contactor KM1 is closed, the yaw motor M corresponds to the "positive phase sequence" and the yaw motor M rotates forward; when the right yaw contactor KM2 is closed, the yaw motor M corresponds to the "negative phase sequence" and the yaw motor M rotates in reverse.
[0051] The initial settings of each switch are as follows: when the yaw state is left yaw or right yaw or non-yaw state, the normal states of each switch are shown in Table 1.
[0052] Table 1 Normal states of each switch in different states
[0053]
[0054] The abnormalities of the active switches of the left yaw contactor KM1, the active switches of the right yaw contactor KM2, and the active switches of the yaw main contactor KM0 include abnormal closing and abnormal opening.
[0055] Based on the above settings, when the active switch of the left yaw contactor KM1 has an abnormal closing, it means that when in the left yaw state, when the control coil of the left yaw contactor KM1 is energized, the active switch of the left yaw contactor KM1 is not turned on. At this time, the normally open switch of the left yaw contactor KM1 is not turned on, the normally closed switch of the left yaw contactor KM1 is turned on, and the second control input terminal DI2 outputs a low level.
[0056] When the active switch of the left yaw contactor KM1 has an abnormal opening, it means that when in the non-yaw state, when the control coil of the left yaw contactor KM1 is not energized, the active switch of the left yaw contactor KM1 is turned on. At this time, the normally open switch of the left yaw contactor KM1 is turned on, the normally closed switch of the left yaw contactor KM1 is not turned on, and the first control input terminal DI1 outputs a low level.
[0057] When the active switch of the right yaw contactor KM2 has an abnormal closing, it means that when in the right yaw state, when the control coil of the right yaw contactor KM2 is energized, the active switch of the right yaw contactor KM2 is not turned on. At this time, the normally open switch of the right yaw contactor KM2 is not turned on, the normally closed switch of the right yaw contactor KM2 is turned on, and the second control input terminal DI2 outputs a low level.
[0058] When the main operating switch of the right yaw contactor KM2 fails to open abnormally, it means that when in the non-yaw state and the control coil of the right yaw contactor KM2 is not energized, the main operating switch of the right yaw contactor KM2 is closed. At this time, the normally open switch of the right yaw contactor KM2 is closed, the normally closed switch of the right yaw contactor KM2 is not closed, and the first control input terminal DI1 outputs a low level.
[0059] When the main operating switch of the yaw main contactor KM0 fails to close abnormally, it means that when in the left yaw or right yaw state and the control coil of the yaw main contactor KM0 is energized, the main operating switch of the yaw main contactor KM0 is not closed. At this time, the normally open switch of the yaw main contactor KM0 is not closed, the normally closed switch of the yaw main contactor KM0 is closed, and the second control input terminal DI2 outputs a low level.
[0060] When the main operating switch of the yaw main contactor KM0 fails to open abnormally, it means that when in the non-yaw state and the control coil of the yaw main contactor KM0 is not energized, the main operating switch of the yaw main contactor KM0 is closed. At this time, the normally open switch of the yaw main contactor KM0 is closed, the normally closed switch of the yaw main contactor KM0 is not closed, and the first control input terminal DI1 outputs a low level.
[0061] Based on the above structure and principle, the flow of the yaw control method for the wind turbine includes the following steps:
[0062] Step 1: When the wind turbine is in the automatic yaw state and the absolute value of the wind alignment deviation angle α reaches the set value and the wind speed V meets the yaw requirement, the first control output terminal DO1 or the second control output terminal DO2 of the control module U1 gives a yaw command, that is, the wind turbine enters the left yaw or right yaw state.
[0063] In this step, the wind turbine is in the automatic yaw state: the yaw system of the wind turbine is working properly and without faults, and the yaw action of the wind turbine is automatically controlled by the control module. The absolute value of the wind alignment deviation angle α reaches the set value and the wind speed V meets the yaw requirement. The wind speed V meeting the yaw requirement generally means that the current wind speed V is within the effective wind speed range: generally greater than 2 m / s and less than 25 m / s, and further greater than 2.5 m / s and less than 22 m / s; the wind alignment deviation angle α refers to the angle between the rotation axis of the wind turbine impeller and the wind (the wind alignment deviation angle α is the average value of the wind alignment deviation angles in a certain time period); the absolute value of the wind alignment deviation angle α reaches the set value, such as 15 degrees or 25 degrees, etc. Generally, the lower the wind speed, the higher the tolerance for the absolute value of the wind alignment deviation angle α.
[0064] In this step, the control module U1 determines whether the unit impeller needs to deflect to the left or right along the central axis of the wind turbine tower according to the wind alignment deviation angle α.
[0065] In this embodiment, the first control output terminal DO1 is the left yaw control port, and the second control output terminal DO2 is the right yaw control port.
[0066] When a left deflection is required, the first control output terminal DO1 gives a yaw command, that is, Figure 3 the control coil of the left yaw enable switch K1 in [[ ]] is energized. After the control coil of the left yaw enable switch K1 is energized, Figure 2 the action switch of the left yaw enable switch K1 in [[ ]] closes, causing the control coils of the left yaw contactor KM1 and the yaw main contactor KM0 to be energized. After the control coils of the left yaw contactor KM1 and the yaw main contactor KM0 are energized, Figure 1 the main action switch of the left yaw contactor KM1 and the main action switch of the yaw main contactor KM0 in [[ ]] close, and the yaw main circuit breaker QF1 is in the closed state. Therefore, Figure 1 the yaw motor M in [[ ]] is energized and runs, driving the blades of the wind turbine to deflect to the left.
[0067] When a right deflection is required, the second control output terminal DO2 gives a yaw command, that is, Figure 3 the control coil of the right yaw enable switch K2 in [[ ]] is energized. After the control coil of the right yaw enable switch K2 is energized, Figure 2 the action switch of the right yaw enable switch K2 in [[ ]] closes, causing the control coils of the right yaw contactor KM2 and the yaw main contactor KM0 to be energized. After the control coils of the right yaw contactor KM2 and the yaw main contactor KM0 are energized, Figure 1 the main action switch of the right yaw contactor KM2 and the main action switch of the yaw main contactor KM0 in [[ ]] close, and the yaw main circuit breaker QF1 is in the closed state. Therefore, Figure 1 the yaw motor M in [[ ]] is energized and runs, driving the blades of the wind turbine to deflect to the right.
[0068] Step 2: Determine whether the second control input terminal DI2 of the contactor status detection port is abnormal. If yes, jump to Step 5; otherwise, jump to Step 3.
[0069] This step is a detection based on the yaw state condition. In this step, when the wind turbine is in the yaw state and the second control input terminal DI2 is at a low level, from the above analysis, it can be seen that it means that either one or both of the yaw main contactor KM0 and the left yaw contactor KM1 (or the right yaw contactor KM2) are closed abnormally, and it is determined that the contactor status detection detected by the second control input terminal DI2 is abnormal. When the wind turbine is in the yaw state and the second control input terminal DI2 is at a high level, it is determined that the contactor status detection detected by the second control input terminal DI2 is normal. Since the left yaw contactor KM1 and the right yaw contactor KM2 are interlocked through a mechanical interlock structure, they will not be closed simultaneously.
[0070] Step 3: When the absolute value of the wind alignment deviation angle β is less than the set value or the wind speed V does not meet the yaw requirement, the control module U1 cancels the yaw command of the first control output terminal DO1 or the second control output terminal DO2, that is, the wind turbine enters the non-yaw state.
[0071] In this step, the wind conditions such as the external wind speed V of the wind turbine not meeting the yaw action conditions generally mean that the current wind speed V is outside the effective wind speed range: generally less than 2 m / s or greater than 25 m / s, and further less than 3 m / s or greater than 22 m / s;
[0072] The value of the wind alignment deviation angle β being less than the set value generally means less than 5 degrees.
[0073] It should be noted that the specific values or ranges of the wind alignment deviation angle α in Step 1 and the wind alignment deviation angle β in Step 3 can be set to be the same or different. Generally, α is the average value of the wind alignment deviation angles for 25 consecutive seconds, β is the average value of the wind alignment deviation angles for 5 consecutive seconds, or others.
[0074] In this step, the control module U1 canceling the yaw command of the first control output terminal DO1 or the second control output terminal DO2 means that the control module U1 outputs a low level at the first control output terminal DO1 to cancel the yaw command, so that Figure 3 the control coil of the left yaw enable switch K1 in Figure 3 is de-energized; or the second control output terminal DO2 outputs a low level to cancel the yaw command, so that
[0075] the control coil of the right yaw enable switch K2 in
[0076] is de-energized. This step is a detection based on the non-yaw state condition. When the first control input terminal DI1 is at a low level, it represents that any one or two or three of the yaw main contactor KM0, the left yaw contactor KM1, and the right yaw contactor KM2 are disconnected abnormally, then it is determined that the contactor state detection detected by the first control input terminal DI1 is abnormal.
[0077] Step 5: Alarm for abnormal yaw contactor status.
[0078] In this step, the alarm for abnormal yaw contactor status includes the wind turbine stopping and exiting the automatic yaw state.
[0079] Finally, it is necessary to state here that the above embodiments are only used to further elaborate on the technical solutions of the present utility model, and should not be construed as limiting the protection scope of the present utility model. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present utility model all fall within the protection scope of the present utility model.
Claims
1. A wind turbine yaw control device, characterized in that: Including yaw main circuit and yaw control circuit, In the yaw main circuit, the main action switch of the left yaw contactor (KM1) and the main action switch of the right yaw contactor (KM2) are connected in parallel, one end of which is connected to the yaw motor (M) and the other end is connected to the output end of the main action switch of the yaw main contactor (KM0), and the input end of the main action switch of the yaw main contactor (KM0) is connected to the three-phase power supply (UVW). The yaw control circuit comprises a control power supply, a left yaw enable switch (K1), a right yaw enable switch (K2), a control module (U1), a yaw cam switch (TS), a first diode (D1) and a second diode (D2); the yaw cam switch (TS) comprises a left limit switch (TS1) and a right limit switch (TS2); the left limit switch (TS1) and the right limit switch (TS2) are normally closed switches; one end of the left limit switch (TS1) is connected to the positive electrode of the control power supply, and the other end is connected to the input end of the action switch of the left yaw enable switch (K1); the output end of the action switch of the left yaw enable switch (K1) is also connected to the yaw main contactor (K1). The control coil input end of the left yaw contactor (KM0) is connected to the control coil input end of the left yaw contactor (KM1), one end of the right limit switch (TS2) is connected to the positive electrode of the control power supply, and the other end is connected to the input end of the action switch of the right yaw enabling switch (K2), the output end of the action switch of the right yaw enabling switch (K2) is simultaneously connected to the control coil input end of the yaw main contactor (KM0) and the control coil input end of the right yaw contactor (KM2), and the control coil output end of the left yaw contactor (KM1), the control coil output end of the right yaw contactor (KM2), and the control coil output end of the yaw main contactor (KM0) are all connected to the negative electrode of the control power supply; The output end of the action switch of the left yaw enabling switch (K1) is connected to the positive pole of the first diode (D1) and the control coil input end of the left yaw contactor (KM1), the output end of the right yaw enabling switch (K2) is connected to the positive pole of the second diode (D2) and the control coil input end of the right yaw contactor (KM2), and the cathode of the first diode (D1) and the cathode of the second diode (D2) are both connected to the control coil input end of the yaw main contactor (KM0); The control module (U1) comprises a first control output terminal (DO1), a second control output terminal (DO2), a first control input terminal (DI1) and a second control input terminal (DI2); two ends of the control coil of the left yaw enabling switch (K1) are respectively connected to the first control output terminal (DO1) and the negative electrode of the control power supply; and two ends of the control coil of the right yaw enabling switch (K2) are respectively connected to the second control output terminal (DO2) and the negative electrode of the control power supply; The normally open switch of the left yaw contactor (KM1) and the normally open switch of the right yaw contactor (KM2) are connected in parallel, one end of which is connected to the second control input terminal (DI2) and the other end is connected to the normally open switch output terminal of the yaw main contactor (KM0). The normally open switch input terminal of the yaw main contactor (KM0) is connected to the positive electrode of the control power supply. The normally closed switch of the yaw main contactor (KM0), the normally closed switch of the left yaw contactor (KM1) and the normally closed switch of the right yaw contactor (KM2) are connected in series, one end of which is connected to the first control input terminal (DI1) and the other end is connected to the positive electrode of the control power supply.
2. The control device according to claim 1, characterized in that: The yaw main circuit also includes a yaw main circuit breaker (QF1), an input end of the yaw main circuit breaker (QF1) is connected to a three-phase power supply (UVW), and an output end of the yaw main circuit breaker (QF1) is connected to an input end of a main action switch of a yaw main contactor (KM0).
3. The control device according to claim 1, characterized in that: The left yaw enable switch (K1) and the right yaw enable switch (K2) are relays.
4. The control device according to claim 1, characterized in that: The control module (U1) is a PLC module or a single chip microcomputer.
5. The control device according to claim 1, characterized in that: The main action switch of the left yaw contactor (KM1) and the main action switch of the right yaw contactor (KM2) are interlocked through a mechanical interlocking structure. When one of the main action switches of the left yaw contactor (KM1) and the right yaw contactor (KM2) is disconnected, the other must be closed.
6. The control device according to claim 5, characterized in that: When the main action switch of the left yaw contactor (KM1) is closed, the normally open switch of the left yaw contactor (KM1) is closed and the normally closed switch of the left yaw contactor (KM1) is opened; when the main action switch of the right yaw contactor (KM2) is closed, the normally open switch of the right yaw contactor (KM2) is closed and the normally closed switch of the right yaw contactor (KM2) is opened; when the main action switch of the yaw main contactor (KM0) is closed, the normally open switch of the yaw main contactor (KM0) is closed and the normally closed switch of the yaw main contactor (KM0) is opened.
7. The control device according to claim 1, characterized in that: The control device further comprises a yaw motor protector, which is connected to the yaw main circuit and cuts off the power supply of the yaw motor (M) by disconnecting.
8. The control device according to claim 1, characterized in that: When the main action switch of the left yaw contactor (KM1) is closed, the wind turbine impeller yaws to the left along the tower axis, and when the main action switch of the right yaw contactor (KM2) is closed, the wind turbine impeller yaws to the right along the tower axis.