A workshop testing system and method for the yaw system of a wind turbine generator set.

Abstract

This invention relates to the field of wind power generation technology, specifically to an in-workshop testing system for the yaw system of a wind turbine generator set. After assembling the yaw system and yaw bearing, the system controls the start / stop, speed, and direction of the yaw motors via a yaw test cabinet, enabling testing of multiple yaw motors within the yaw system and improving its reliability. The invention also relates to an in-workshop testing method for the yaw system of a wind turbine generator set. This method controls the start / stop, speed, and direction of the yaw motors via a yaw test cabinet, acquires the current signals of each yaw motor, obtains the stress conditions of each yaw motor based on these current signals, and then adjusts the tooth clearance between the gears of the yaw gearbox and the gears of the generator set bearings based on these stress conditions. This results in a more even distribution of load across the multiple yaw motors in the yaw system, further improving the reliability of the yaw system.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a workshop testing system and method for the yaw system of a wind turbine generator set. Background Technology

[0002] Currently, my country's wind turbine generator sets are in a phase of rapid development, and the requirements for the reliability of these units are becoming increasingly stringent. Effective commissioning methods during component assembly can improve the reliability of the generator set. The yaw system, a component of the wind turbine nacelle, functions to quickly and smoothly align with the wind direction when the wind speed vector changes, ensuring the rotor receives maximum wind energy. Therefore, the yaw system is a crucial factor determining the reliability of the wind turbine generator set. As the capacity of the generator set increases, the weight of the nacelle also increases, making the testing of the yaw system after nacelle assembly a pressing issue that needs to be addressed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a workshop testing system and method for the yaw system of wind turbine generator sets, which enables testing of the yaw system after nacelle assembly, thereby improving the reliability of the yaw system.

[0004] In a first aspect, the present invention improves a workshop testing system for the yaw system of a wind turbine generator set.

[0005] In a first feasible embodiment, a workshop testing system for a wind turbine generator yaw system includes a power control circuit and a yaw test cabinet. The power control circuit is connected to the yaw test cabinet and is used to control the power supply to the yaw test cabinet. The yaw test cabinet includes: a yaw frequency converter connected to each yaw motor and used to control the start, stop, direction, and speed of the yaw motor; a current transformer connected to the power supply cable of each yaw motor and used to measure the current signal of each yaw motor; a PLC connected to the current transformer, motor micro switch, IBOX, and touch screen respectively, used to receive the current signals provided by the current transformer and the motor feedback signals provided by the motor micro switch, and also used to control the IBOX and touch screen; an IBOX connected to the PLC and used to store the current signals and motor feedback signals; and a touch screen connected to the IBOX and used to display the current signals and motor feedback signals.

[0006] In conjunction with the first feasible method, in the second feasible method, the power control circuit includes:

[0007] The yaw test cabinet power supply module has one end connected to the power supply, and the other end connected to one end of the yaw motor power supply module and one end of the yaw motor brake power supply module respectively.

[0008] The other end of the yaw motor power supply module is connected to the yaw motor brake power supply module via a frequency converter.

[0009] The yaw motor brake power supply module is connected to the yaw motor at the other end.

[0010] In conjunction with the second feasible method, in the third feasible method, the yaw test cabinet includes a heater and a ventilation fan, and the power supply module for the yaw test cabinet includes:

[0011] The first switch has one end connected to the power supply, and the other end connected to one end of the second switch, one end of the third switch, one end of the fourth switch, and one end of the fifth switch, respectively.

[0012] The second switch is connected to the ventilation fan via the sixth switch and to the heater via the seventh switch.

[0013] The third switch connects to the frequency converter at the other end.

[0014] The fourth switch is connected to the yaw motor brake via the eleventh switch on the other end.

[0015] The fifth switch connects to one end of the level conversion submodule; the other end of the level conversion submodule is connected to the PLC via the eighth switch, to the current transmitter via the ninth switch, and to the touch screen and IBOX via the tenth switch.

[0016] In conjunction with the third feasible method, in the fourth feasible method, the switching sequence of the yaw test cabinet power supply module includes:

[0017] Step S01: Close the first switch to supply power to the yaw test cabinet;

[0018] Step S02: Close the fifth switch to supply power to the level conversion submodule;

[0019] Step S03: Close the fourth switch to supply power to the yaw motor brake;

[0020] Step S04: Close the third switch to supply power to the yaw inverter;

[0021] Step S05: Close the second, sixth, and seventh switches to supply power to the heater and the shunt fan inside the yaw test cabinet;

[0022] Step S06: Close the eighth, ninth, and tenth switches respectively to start the PLC, touch screen, and IBOX;

[0023] Step S07: After closing the eleventh switch to supply power to the yaw brake, release the brake.

[0024] In conjunction with the second feasible method, in the fifth feasible method, the yaw motor power supply module includes:

[0025] The yaw converter is connected to the yaw test cabinet power supply module at one end via a third switch, and to one end of the braking resistor at the other end.

[0026] The other end of the braking resistor is connected to the yaw motor brake power supply module via a yaw converter.

[0027] The local emergency stop button is connected at one end to the yaw test cabinet power supply module, and at the other end to one end of the first contactor via the first relay.

[0028] The first contactor is connected to the yaw test cabinet power supply module at the other end.

[0029] In conjunction with the fifth feasible method, in the sixth feasible method, the yaw test cabinet includes a test cabinet door, and the test cabinet door includes:

[0030] The yaw brake enable switch has one end connected to the power supply and the other end connected to the first end of the yaw motor power supply module through one end of the second relay.

[0031] The yaw motor reverse control switch has one end connected to the power supply through the other end of the second relay, and the other end connected to one end of the yaw motor forward control switch.

[0032] The yaw motor forward rotation control switch has one end connected to the second end of the yaw motor power supply module via one end of the third relay, and the other end connected to the third end of the yaw motor power supply module via one end of the fourth relay.

[0033] The other end of the third relay is interconnected with the other end of the fourth relay to form an interlocking structure;

[0034] The yaw brake enable indicator light is connected to 0V on one end and to the first end of the yaw motor power supply module on the other end.

[0035] The motor forward rotation indicator light is connected to 0V on one end and to the second end of the yaw motor power supply module on the other end.

[0036] The motor reverse indicator light is connected to 0V on one end and to the third terminal of the yaw motor power supply module on the other end.

[0037] The second contactor has one end connected to 0V and the other end connected to the first terminal of the yaw motor power supply module.

[0038] In conjunction with the sixth feasible method, in the seventh feasible method, the yaw test cabinet includes a remote operating handle, which includes:

[0039] The remote emergency stop button is connected to the local emergency stop button via the first relay.

[0040] The yaw enable button is connected to the second relay;

[0041] The yaw motor forward rotation button is connected to the third relay;

[0042] The yaw motor reverse control button is connected to the fourth relay.

[0043] Secondly, the present invention provides a workshop testing method for the yaw system of a wind turbine generator set.

[0044] In the eighth feasible method, a workshop testing method for the yaw system of a wind turbine generator, based on the aforementioned workshop testing system for the yaw system of a wind turbine generator, includes:

[0045] The yaw device is tested using a yaw test cabinet to obtain the current signals of each yaw motor.

[0046] The force conditions of each yaw motor are obtained based on each current signal;

[0047] The tooth clearance between the gears in the yaw gearbox and the gears in the unit bearings is adjusted according to the force conditions of each yaw motor.

[0048] In conjunction with the eighth feasible method, the ninth feasible method obtains the force conditions of each yaw motor based on each current signal, including:

[0049] Determine whether the current signals are the same;

[0050] When all current signals are the same, it is determined that the forces on each yaw motor are the same; when the current signals are different, it is determined that the forces on each yaw motor are different.

[0051] In conjunction with the eighth feasible method, the tenth feasible method involves adjusting the tooth backlash between the gears of the yaw gearbox and the gears of the unit bearings based on the force conditions of each yaw motor, including:

[0052] When the forces on each yaw motor are different, adjust the eccentricity of the yaw reducer of several yaw gearboxes until the forces on each yaw motor are the same.

[0053] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows:

[0054] 1. After assembling the yaw system and yaw bearing, the yaw motor is started, stopped, rotated, and directed by the yaw test cabinet. This enables the testing of multiple yaw motors in the yaw system, improving the reliability of the yaw system and reducing the requirements for foundation bearing capacity and the strength of debugging fixtures during yaw debugging.

[0055] 2. After assembling the yaw system and yaw bearing, the yaw motors are started, stopped, rotated, and oriented via the yaw test cabinet. The current signals of each yaw motor are acquired, and the stress on each yaw motor is determined based on these signals. The backlash between the gears in the yaw gearbox and the gears in the unit bearings is then adjusted according to the stress on each yaw motor. This ensures a more even distribution of load across the multiple yaw motors in the yaw system, further improving the reliability of the yaw system. Attached Figure Description

[0056] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0057] Figure 1 A schematic diagram of a workshop testing system for a wind turbine yaw system provided by the present invention;

[0058] Figure 2 The circuit diagram of the yaw test cabinet control module provided by the present invention;

[0059] Figure 3 Circuit diagram of the yaw motor power supply module provided by the present invention;

[0060] Figure 4 Circuit diagram of the yaw motor brake power supply module provided by the present invention;

[0061] Figure 5 The circuit diagram of the test cabinet door provided by the present invention;

[0062] Figure 6 Circuit diagram of the remote control handle provided for this invention;

[0063] Figure 7 This is a schematic diagram of a workshop testing method for a wind turbine generator yaw system provided by the present invention.

[0064] Figure label:

[0065] 1. Power control circuit; 2. Yaw test cabinet; 21. Yaw inverter; 22. Each yaw motor; 23. Current transformer; 24. Motor micro switch; 25. PLC (Programmable Logic Controller); 26. IBOX; 27. Touch screen; 100-F1, First switch; 700-F2, Second switch; 700-Q103, Third switch; 700-F200, Fourth switch; 700-F3, Fifth switch; 701-B1, Sixth switch; 701-B3, Seventh switch; 700-F4, Eighth switch; 700-F5, Ninth switch; 700-F6, Tenth switch; 705-Q200, Eleventh switch; 700-B2, Yaw converter; 700-R1, Braking resistor; 700-S1, Local emergency stop button; 7 00-K1, First Relay; 700-Q10, First Contactor; 700-F101, Protective Switch; 700-M101, Yaw Motor; 700-S2, Yaw Brake Enable Switch; 700-K2, Second Relay; 700-S4, Yaw Motor Reverse Control Switch; 700-S3, Yaw Motor Forward Control Switch; 700-K3, Third Relay; 700-K4, Fourth Relay; 700-P2, Yaw Brake Enable Indicator Light; 700-P3, Motor Forward Indicator Light; 700-P4, Motor Reverse Indicator Light; 700-Q200, Second Contactor. Detailed Implementation

[0066] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0067] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this invention pertains. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data used can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Unless otherwise stated, the term "a plurality of" means two or more. In this disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B. The term "and / or" describes an association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B. The term "corresponding" can refer to an association or binding relationship; A corresponding to B means that there is an association or binding relationship between A and B.

[0068] Combination Figure 1 As shown, this embodiment provides a workshop testing system for the yaw system of a wind turbine generator set, including a power control circuit 1 and a yaw test cabinet 2. The power control circuit 1 is connected to the yaw test cabinet 2 and is used to control the power supply to the yaw test cabinet. The yaw test cabinet includes: a yaw frequency converter 21, connected to each yaw motor 22, used to control the start, stop, direction and speed of the yaw motor; a current transformer 23, connected to the power supply cable of each yaw motor, used to measure the current signal of each yaw motor; a PLC 25, connected to the current transformer 23, the motor micro switch 24, the IBOX 26 and the touch screen 27 respectively, used to receive the current signals provided by the current transformer and the motor feedback signals provided by the motor micro switch, and also used to control the IBOX and the touch screen; the IBOX 26 is connected to the PLC 25 and is used to store the current signals and the motor feedback signals; the touch screen 27 is connected to the IBOX 26 and is used to display the current signals and the motor feedback signals.

[0069] This embodiment provides a workshop testing system for the yaw system of a wind turbine generator set. After the yaw system and yaw bearing are assembled, the yaw test cabinet controls the start, stop, speed and direction of the yaw motor, enabling the testing of multiple yaw motors in the yaw system. This reduces the requirements for the foundation bearing capacity and the strength of the debugging tooling during yaw debugging.

[0070] Optionally, the current transformer in the test cabinet collects the current signals of each yaw motor, the motor micro switch collects the motor feedback signals, and after the PLC receives the current signals and motor feedback signals of each yaw motor, it controls the IBOX to store the current signals and motor feedback signals. The touch screen displays the current signals and motor feedback signals, and then analyzes the force situation of each yaw motor based on the current signals and motor feedback signals. Based on the force situation of each yaw motor, it judges whether the load of each yaw motor is uniform. If the load of the yaw motor is uneven, the backlash is adjusted to make the load of each motor more uniform, thereby realizing the testing and adjustment of the yaw system and improving the performance of the yaw system.

[0071] Optionally, the power control circuit includes: a yaw test cabinet power supply module, one end of which is connected to a power supply, and the other end of which is connected to one end of the yaw motor power supply module and one end of the yaw motor brake power supply module respectively; the other end of the yaw motor power supply module is connected to the yaw motor brake power supply module via a frequency converter; and the other end of the yaw motor brake power supply module is connected to the yaw motor.

[0072] In some embodiments, the number of yaw motors is determined according to the design of wind turbine units with different capacities. The parameters of the yaw inverter are adjusted based on the number of yaw motors and their nameplate parameters to ensure that the output current of the yaw inverter can support the control of the start-up, shutdown, direction, and speed of all yaw motors. The yaw inverter and reactor inside the yaw test cabinet control the start-up, shutdown, and smooth operation of the yaw motors. The yaw motors drive the nacelle yaw bearings to rotate forward and backward via a connected yaw gearbox. A current transmitter in the yaw test cabinet is connected to each yaw motor to measure the current signal and microswitch feedback signal of each yaw motor. The IBOX in the yaw test cabinet stores the current signal and microswitch feedback signal of the yaw motors. The PLC and touchscreen in the yaw test cabinet can display the collected current signal and microswitch feedback signal of each yaw motor on the touchscreen for real-time viewing.

[0073] In some embodiments, the yaw test cabinet uses a 5G16 cable connected to a 400V power supply, and uses a 4×2.5 cable and a 5G1.5 cable to supply power, brake and provide feedback signals for each yaw motor respectively.

[0074] Optionally, combined Figure 2As shown, the yaw test cabinet includes a heater and a ventilation fan. The yaw test cabinet control module includes: one end of the first switch 700-F1 is connected to the power supply, and the other end is connected to one end of the second switch 700-F2, one end of the third switch 700-Q10, one end of the fourth switch 700-F200, and one end of the fifth switch 700-F3; the other end of the second switch 700-F2 is connected to the ventilation fan through the sixth switch 701-B1, and to the heater through the seventh switch 701-B3; the third... The other end of switch 700-Q10 is connected to the frequency converter; the other end of the fourth switch 700-F200 is connected to the yaw motor brake via the eleventh switch 705-Q200; the other end of the fifth switch 700-F3 is connected to one end of the level conversion submodule 700-T1; the other end of the level conversion submodule 700-T1 is connected to the PLC via the eighth switch 700-F4, to the current transmitter via the ninth switch 700-F5, and to the touch screen and IBOX via the tenth switch 700-F6.

[0075] Optionally, a heater is used to increase the temperature inside the yaw test cabinet; a ventilation fan is used to decrease the temperature inside the yaw test cabinet.

[0076] Optionally, the switching sequence of the power control circuit includes:

[0077] Step S01: Close the first switch 700-F1 to supply power to the yaw test cabinet;

[0078] Step S02: Close the fifth switch 700-F3 to supply power to the level conversion submodule 700-T1;

[0079] Step S03: Close the fourth switch 700-F200 to supply power to the yaw motor brake;

[0080] Step S04: Close the third switch 700-Q10 to supply power to the yaw inverter;

[0081] Step S05: Close the second switch 700-F2, the sixth switch 701-B1, and the seventh switch 701-B3 to supply power to the heater and the shunt fan inside the yaw test cabinet;

[0082] Step S06: Close the eighth switch 700-F4, the ninth switch 700-F5, and the tenth switch 700-F6 respectively to start the PLC, touch screen, and IBOX;

[0083] Step S07: After closing the eleventh switch 705-Q200 to supply power to the yaw brake, release the brake.

[0084] In some embodiments, after the yaw test cabinet is started via the power control circuit, the yaw motor's start / stop, rotation direction, and rotation speed are controlled by the yaw inverter. The yaw motor's current signal and the motor microswitch feedback signal are observed on the touchscreen to see if they meet preset conditions. If not, the clearance between the gears in the yaw gearbox and the yaw bearing is adjusted until the yaw motor's current signal and the motor microswitch feedback signal meet the preset conditions. Then, the yaw debugging data is downloaded from the PLC, the yaw motor is stopped remotely or locally, and the 705-Q200 is disconnected to brake the yaw motor. After disconnecting other switches in sequence, the yaw debugging task of this unit is completed.

[0085] Optionally, combined Figure 3 As shown, the yaw motor power supply module includes: one end of the yaw converter 700-B2 is connected to the yaw test cabinet power supply module via a third switch, and the other end is connected to one end of the braking resistor 700-R1; the other end of the braking resistor 700-R1 is connected to the yaw motor brake power supply module via the yaw converter; one end of the local emergency stop button 700-S1 is connected to the yaw test cabinet power supply module, and the other end is connected to one end of the first contactor 700-Q10 via the first relay 700-K1; the other end of the first contactor 700-Q10 is connected to the yaw test cabinet power supply module.

[0086] Optionally, combined Figure 4 As shown, the yaw motor brake power supply module includes: one end of the protection switch 700-F101 is connected to the yaw motor power supply module through the yaw converter, and the other end is connected to the yaw motor 700-M101; the yaw motor brake is connected to the power supply.

[0087] Optionally, the yaw test cabinet includes a test cabinet door and a remote operating handle, combined with Figure 5As shown, the test cabinet door includes: a yaw brake enable switch 700-S2, one end of which is connected to a 24V power supply, and the other end of which is connected to the first terminal of the yaw motor power supply module via one terminal of the second relay 700-K2; a yaw motor reverse control switch 700-S4, one end of which is connected to a 24V power supply via the other terminal of the second relay 700-K2, and the other end of which is connected to one terminal of the yaw motor forward control switch 700-S3; the other end of the yaw motor forward control switch 700-S3 is connected to the second terminal of the yaw motor power supply module via one terminal of the third relay 700-K3, and to the second terminal of the yaw motor power supply module via one terminal of the fourth relay 700-K4. The third terminal of the yaw motor power supply module is connected; the other end of the third relay 700-K3 is interconnected with the other end of the fourth relay 700-K4 to form an interlock structure; one end of the yaw brake enable indicator 700-P2 is connected to 0V, and the other end is connected to the first terminal of the yaw motor power supply module; one end of the motor forward rotation indicator 700-P3 is connected to 0V, and the other end is connected to the second terminal of the yaw motor power supply module; one end of the motor reverse rotation indicator 700-P4 is connected to 0V, and the other end is connected to the third terminal of the yaw motor power supply module; one end of the second contactor 700-Q200 is connected to 0V, and the other end is connected to the first terminal of the yaw motor power supply module.

[0088] In some embodiments, the yaw brake enable switch 700-S2 on the cabinet door controls the power supply for the yaw brake, and the second contactor 700-Q200 controls the power supply for the yaw brake; when 700-S3 is closed, it controls the motor to rotate forward (UVW), and when 700-S4 is closed, it controls the motor to rotate in reverse (WVU). 700-S3 and 700-S4 are mechanically interlocked.

[0089] Optionally, the yaw test cabinet includes a remote operating handle, combined with Figure 6 As shown, the remote control handle includes: a remote emergency stop button, which is connected to the local emergency stop button via a first relay 700-K1; a yaw enable button, which is connected to a second relay 700-K2; a yaw motor forward rotation button, which is connected to a third relay 700-K3; and a yaw motor reverse rotation control button, which is connected to a fourth relay 700-K4.

[0090] Optionally, the normally open contact of the relay 700-K1 controlled by the emergency stop button on the operating handle is connected in series with the emergency stop button 700-S1 on the cabinet door. In case of emergency, the coil of the contactor 700-Q10 can be de-energized by pressing the emergency stop button on the cabinet door or the operating handle, thereby disconnecting the power supply to the yaw inverter and then disconnecting the power supply to the yaw motor, thus improving the safety of the device.

[0091] In some embodiments, the yaw enable button on the operating handle controls the second relay, the yaw motor forward rotation button controls the third relay, and the yaw motor reverse rotation button controls the fourth relay. The third and fourth relays are designed to be interlocked to prevent the yaw motor from rotating forward and in reverse simultaneously.

[0092] In some embodiments, the rotary switch and operating handle on the cabinet door are designed so that they cannot be controlled simultaneously. The principle is as follows: Figure 5 and Figure 6 As shown. When the yaw enable switch 700-S2 on the cabinet door is set to 1, the yaw forward and reverse control buttons on the operating handle cannot control the yaw inverter's operation; when the enable switch on the operating handle is set to 1, the yaw forward and reverse control buttons on the cabinet door cannot control the yaw inverter's operation. The brake enable switch on the operating handle has higher priority than the yaw enable button on the cabinet door. This prevents damage to the device due to human error and improves the device's reliability.

[0093] Combination Figure 7 As shown, in some embodiments, a workshop testing method for a wind turbine yaw system, based on the aforementioned workshop testing system for a wind turbine yaw system, includes:

[0094] Step S11: Test the yaw device through the yaw test cabinet to obtain the current signal of each yaw motor;

[0095] Step S12: Obtain the force conditions of each yaw motor based on each current signal;

[0096] Step S13: Adjust the tooth backlash between the gears of the yaw gearbox and the gears of the unit bearings according to the force conditions of each yaw motor.

[0097] This embodiment provides a workshop testing method for the yaw system of a wind turbine generator set. After assembling the yaw system and yaw bearing, the yaw motor is started, stopped, rotated, and oriented via a yaw test cabinet. The current signals of each yaw motor are acquired, and the stress on each yaw motor is obtained based on these current signals. Then, the backlash between the gears of the yaw gearbox and the gears of the generator set bearings is adjusted according to the stress on each yaw motor. This results in a more uniform load distribution among the multiple yaw motors in the yaw system, reducing the requirements for foundation bearing capacity and the strength of the testing equipment during yaw debugging.

[0098] Optionally, the force condition of each yaw motor is obtained based on each current signal, including: determining whether each current signal is the same; if each current signal is the same, determining that each yaw motor is subjected to the same force; if each current signal is different, determining that each yaw motor is subjected to different forces.

[0099] Optionally, the tooth backlash between the gears of the yaw gearbox and the gears of the unit bearing can be adjusted according to the force conditions of each yaw motor. This includes adjusting the eccentricity of the yaw reducers of several yaw gearboxes until the force on each yaw motor is the same when the forces on each yaw motor are different.

[0100] In some embodiments, adjusting the eccentricity of the yaw reducer in the yaw gearbox can adjust the backlash between the gears of the yaw gearbox and the gears of the unit bearing. In the prior art, the backlash between the gears of the yaw gearbox and the yaw bearing is usually adjusted to meet technical requirements. However, these requirements limit the range of backlash. Therefore, even if the backlash between the gears of the yaw gearbox and the yaw bearing is within the range specified by the technical requirements, uneven load distribution among the yaw motors may still occur. Therefore, this solution determines whether the force on each yaw motor is consistent by acquiring the current signal of each yaw motor, thus determining whether the load on each yaw motor is uniform. If the load is uneven, adjusting the backlash makes the load distribution of each yaw motor more uniform, thereby reducing the probability of yaw motor damage, increasing the service life of the yaw motors, and improving the reliability of the yaw system.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A workshop testing system for the yaw system of a wind turbine generator set, characterized in that, The system includes a power control circuit and a yaw test cabinet. The power control circuit is connected to the yaw test cabinet and is used to control the power supply to the yaw test cabinet. The yaw test cabinet includes: Yaw inverter, connected to each yaw motor, is used to control the start, stop, direction and speed of the yaw motor; Current transformers are connected to the power supply cables of each yaw motor and are used to measure the current signal of each yaw motor. The PLC is connected to the current transformer, motor micro switch, IBOX, and touch screen respectively. It is used to receive the current signals provided by the current transformer and the motor feedback signals provided by the motor micro switch. It is also used to control the IBOX and touch screen. IBOX, connected to PLC, is used to store various current signals and motor feedback signals; A touchscreen, connected to the IBOX, is used to display various current signals and motor feedback signals; The power control circuit includes: The yaw test cabinet power supply module has one end connected to the power supply, and the other end connected to one end of the yaw motor power supply module and one end of the yaw motor brake power supply module respectively. The other end of the yaw motor power supply module is connected to the yaw motor brake power supply module via a frequency converter. The yaw motor brake power supply module is connected to the yaw motor at the other end. The workshop testing system for the yaw system of the wind turbine generator set is used to conduct workshop testing of the yaw system of the wind turbine generator set, including: After assembling the yaw system and yaw bearing, the yaw device is tested through the yaw test cabinet to obtain the current signal of each yaw motor. The force conditions of each yaw motor are obtained based on the current signals described above; Adjusting the backlash between the gears in the yaw gearbox and the gears in the unit bearings according to the force conditions of each yaw motor includes: When the forces on each yaw motor are different, adjust the eccentricity of the yaw reducer of several yaw gearboxes until the forces on each yaw motor are the same.

2. The system according to claim 1, characterized in that, The yaw test cabinet includes a heater and a ventilation fan, and the power supply module for the yaw test cabinet includes: The first switch has one end connected to the power supply, and the other end connected to one end of the second switch, one end of the third switch, one end of the fourth switch, and one end of the fifth switch, respectively. The second switch is connected to the ventilation fan via the sixth switch and to the heater via the seventh switch. The third switch connects to the frequency converter at the other end. The fourth switch is connected to the yaw motor brake via the eleventh switch on the other end. The fifth switch connects to one end of the level conversion submodule; the other end of the level conversion submodule is connected to the PLC via the eighth switch, to the current transmitter via the ninth switch, and to the touch screen and IBOX via the tenth switch.

3. The switching sequence of the yaw test cabinet power supply module according to claim 2 includes: Step S01: Close the first switch to supply power to the yaw test cabinet; Step S02: Close the fifth switch to supply power to the level conversion submodule; Step S03: Close the fourth switch to supply power to the yaw motor brake; Step S04: Close the third switch to supply power to the yaw inverter; Step S05: Close the second, sixth, and seventh switches to supply power to the heater and the shunt fan inside the yaw test cabinet; Step S06: Close the eighth, ninth, and tenth switches respectively to start the PLC, touch screen, and IBOX; Step S07: After closing the eleventh switch to supply power to the yaw brake, release the brake.

4. The system according to claim 1, characterized in that, The yaw motor power supply module includes: The yaw converter is connected to the yaw test cabinet power supply module at one end via a third switch, and to one end of the braking resistor at the other end. The other end of the braking resistor is connected to the yaw motor brake power supply module via a yaw converter. The local emergency stop button is connected at one end to the yaw test cabinet power supply module, and at the other end to one end of the first contactor via the first relay. The first contactor is connected to the yaw test cabinet power supply module at the other end.

5. The system according to claim 4, characterized in that, The yaw test cabinet includes a test cabinet door, and the test cabinet door includes: The yaw brake enable switch has one end connected to the power supply and the other end connected to the first end of the yaw motor power supply module through one end of the second relay. The yaw motor reverse control switch has one end connected to the power supply through the other end of the second relay, and the other end connected to one end of the yaw motor forward control switch. The yaw motor forward rotation control switch has one end connected to the second end of the yaw motor power supply module via one end of the third relay, and the other end connected to the third end of the yaw motor power supply module via one end of the fourth relay. The other end of the third relay is interconnected with the other end of the fourth relay to form an interlocking structure; The yaw brake enable indicator light is connected to 0V on one end and to the first end of the yaw motor power supply module on the other end. The motor forward rotation indicator light is connected to 0V on one end and to the second end of the yaw motor power supply module on the other end. The motor reverse indicator light is connected to 0V on one end and to the third terminal of the yaw motor power supply module on the other end. The second contactor has one end connected to 0V and the other end connected to the first terminal of the yaw motor power supply module.

6. The system according to claim 5, characterized in that, The yaw test cabinet includes a remote control handle, which includes: The remote emergency stop button is connected to the local emergency stop button via the first relay. Yaw enable button, connected to the second relay; The yaw motor forward rotation button is connected to the third relay; The yaw motor reverse control button is connected to the fourth relay.

7. A workshop testing method for the yaw system of a wind turbine generator set, based on the workshop testing system for the yaw system of a wind turbine generator set according to any one of claims 1-6, characterized in that, include: After assembling the yaw system and yaw bearing, the yaw device is tested through the yaw test cabinet to obtain the current signal of each yaw motor. The force conditions of each yaw motor are obtained based on the current signals described above; Adjusting the backlash between the gears in the yaw gearbox and the gears in the unit bearings according to the force conditions of each yaw motor includes: When the forces on each yaw motor are different, adjust the eccentricity of the yaw reducer of several yaw gearboxes until the forces on each yaw motor are the same.

8. The method according to claim 7, characterized in that, The force conditions of each yaw motor are obtained based on the aforementioned current signals, including: Determine whether the current signals described are the same; If all the current signals are the same, it is determined that the forces on each yaw motor are the same; if the current signals are different, it is determined that the forces on each yaw motor are different.

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