Detection circuit, detection device and detection method of yaw motor

Abstract

The invention provides a detection circuit, a detection device and a detection method of a yaw motor. The detection circuit comprises a first contactor which is electrically connected between the first group of yaw motors and an alternating current power supply and controls the first group of yaw motors to rotate in the forward direction; the second contactor is connected with the first contactor in parallel and controls the first group of yaw motors to rotate reversely; the third contactor is electrically connected between the second group of yaw motors and the alternating current power supply and controls the second group of yaw motors to rotate forwards; the fourth contactor is connected with the third contactor in parallel and controls the second group of yaw motors to rotate reversely; and a current detector that detects a first detection current of the common power supply path when the first contactor and the third contactor are turned on, and detects a second detection current of the common power supply path when one of the second contactor and the fourth contactor is turned on. By means of the detection circuit, whether the yaw motor works normally or not can be judged.

Description

Technical Field

[0001] The present application relates to the field of wind power, and more specifically, to a detection circuit, a detection device and a detection method for a yaw motor. Background Art

[0002] Factory inspection of the action of the actuators of wind turbines (referred to as wind turbines, turbines, wind turbines, etc.), especially the inspection of the power supply lines, is an important measure to ensure the product quality of wind turbines, improve the reliability of wind turbine operation, and reduce the time for on-site commissioning and maintenance. The inspection of the yaw motor, which is an important functional component of the wind turbine, generally adopts the inspection method of starting the yaw and observing whether the yaw motor is in action.

[0003] Existing detection methods have the following disadvantages:

[0004] 1) Starting the yaw only shows that the yaw system can operate normally, but it cannot be used to determine the working status or condition of each yaw motor in the yaw system.

[0005] 2) Due to different cabin loads, different factory power grid environments, different yaw motor brands, and different yaw motor quantity configurations, it is impossible to observe the working status or condition of each yaw motor through the current.

[0006] 3) Manual observation cannot achieve automated analysis and detection, and the yaw motor is meshed with the yaw gear at the bottom of the cabin. It is dangerous for humans to observe when the mechanical parts are rotating. In addition, when only part of the yaw motor is not working, the yaw gear will drive the non-working yaw motor to rotate, so it is impossible to observe and identify the working status of the motor.

[0007] 4) The yaw motor itself has no operating feedback signal, so it is impossible to determine whether the equipment is operating normally.

[0008] 5) When personnel detect the current at a single detection point, they need to frequently change the current detection position. It may even be difficult to place the detection equipment on the lines of some equipment. If each yaw motor is equipped with a current transformer, in addition to the current transformer, wiring terminals, lines, and modules for collecting current signals must also be installed, which increases the equipment cost. Summary of the invention

[0009] In order to solve at least one of the above technical problems, the present disclosure provides a detection circuit, a detection device and a detection method for a yaw motor.

[0010] According to a first aspect of the present disclosure, a detection circuit for a yaw motor of a yaw system is provided, the yaw motor comprising a first group of yaw motors and a second group of yaw motors, the detection circuit comprising: a first contactor, electrically connected between the first group of yaw motors and an AC power supply and used to control the first group of yaw motors to rotate forward; a second contactor, electrically connected between the first group of yaw motors and the AC power supply, connected in parallel with the first contactor and used to control the first group of yaw motors to rotate reversely; a third contactor, electrically connected between the second group of yaw motors and the AC power supply and used to control the second group of yaw motors to rotate forward; a fourth contactor, electrically connected between the second group of yaw motors and the AC power supply, connected in parallel with the third contactor and used to control the second group of yaw motors to rotate reversely; a current detector, electrically connected to a common power supply path for the AC power supply to power the first group of yaw motors and the second group of yaw motors, detecting a first detection current of the common power supply path when the first contactor and the third contactor are turned on, and detecting a second detection current of the common power supply path when one of the second contactor and the fourth contactor is turned on.

[0011] According to an embodiment of the present disclosure, the detection circuit may further include a controller, which sends a control signal to the first contactor, the second contactor, the third contactor and the fourth contactor to control the on and off of the first contactor, the second contactor, the third contactor and the fourth contactor, receives a first detection current and a second detection current, and determines whether there is an inoperative yaw motor in the yaw motor according to the magnitude of the first detection current and the second detection current.

[0012] According to an embodiment of the present disclosure, the controller may be configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, and divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, compare the first average value with the second average value, and determine whether there is a non-working yaw motor in the yaw motors based on the comparison result.

[0013] According to an embodiment of the present disclosure, the current detector may detect a second detection current when the second contactor and one of the fourth contactors are turned on to make the yaw system reverse yaw from a predetermined position to an intermediate position, and detect a third detection current of a common power supply path when the second contactor and one of the fourth contactors are turned on again to make the yaw system further reverse yaw from the intermediate position to an initial position after the yaw system stops at the intermediate position for a predetermined time. The controller may be configured to determine whether there is an inoperative yaw motor in the yaw motors according to the magnitudes of the first detection current, the second detection current and the third detection current.

[0014] According to an embodiment of the present disclosure, the controller may be further configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the third detection current by the number of yaw motors in a corresponding one to obtain a third average value, compare the first current value with the second average value and the third average value, respectively, and determine whether there is an inoperative yaw motor in the yaw motors based on the comparison result.

[0015] According to an embodiment of the present disclosure, the current detector may detect a second detection current when one of the second contactor and the fourth contactor is turned on to make the yaw system reverse yaw from a predetermined position to an intermediate position, and detect a fourth detection current of a common power supply path when the other of the second contactor and the fourth contactor is turned on to make the yaw system reverse yaw from the intermediate position to an initial position, and the controller may be configured to determine whether there is an inoperative yaw motor in the yaw motor according to the magnitude of the first detection current, the second detection current and the fourth detection current.

[0016] According to an embodiment of the present disclosure, the controller may be further configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the fourth detection current by the number of yaw motors in the other one to obtain a fourth average value, compare the first average value with the second average value and the fourth average value, respectively, and determine whether there is an inoperative yaw motor in the yaw motors based on the comparison result.

[0017] According to an embodiment of the present disclosure, the A-phase line, B-phase line and C-phase line of the AC power supply can be electrically connected to the first input terminal, the second input terminal and the third input terminal of each yaw motor in the first group of yaw motors through a first contactor; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the first input terminal, the second input terminal and the third input terminal of each yaw motor in the second group of yaw motors through a third contactor; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal and the first input terminal of each yaw motor in the first group of yaw motors through a second contactor; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal and the first input terminal of each yaw motor in the second group of yaw motors through a fourth contactor.

[0018] According to an embodiment of the present disclosure, the first detection current and the second detection current may both be currents of the corresponding yaw motor in a stable stage after startup.

[0019] According to a second aspect of the present disclosure, a detection method for a yaw motor of a yaw system is provided. The detection method uses the above-mentioned detection circuit to perform the following steps: connect the first contactor and the third contactor, and detect a first detection current of a common power supply path, connect the second contactor and one of the fourth contactor, and detect a second detection current of the common power supply path, and determine whether there is an inoperative yaw motor in the yaw motor according to the magnitude of the first detection current and the second detection current.

[0020] According to a third aspect of the present disclosure, a detection device for a yaw motor of a yaw system may be provided, the detection device comprising the above-mentioned detection circuit.

[0021] According to a fourth aspect of the present disclosure, a yaw system is provided, the yaw system comprising a plurality of yaw motors and the above-mentioned detection circuit, wherein the plurality of yaw motors are not connected to a transmission chain including a reducer.

[0022] By using the detection circuit according to the embodiment of the present disclosure, it is possible to detect whether the yaw motor is working.

[0023] The detection circuit according to the embodiment of the present disclosure can accurately determine the number of non-operating yaw motors.

[0024] Using the detection circuit according to the embodiment of the present disclosure can reduce the cost of equipment.

[0025] The detection circuit according to the embodiment of the present disclosure can realize the automation of the yaw motor detection of the wind turbine generator set, ensure the standardization of detection and compliance and judgment basis, reduce the workload of personnel, and further ensure the factory quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram showing a detection circuit according to an embodiment of the present disclosure.

[0027] Figure 2 is a flowchart illustrating a detection method according to a first embodiment of the present disclosure.

[0028] Figure 3 is a flowchart illustrating a detection method according to a second embodiment of the present disclosure.

[0029] Figure 4 is a flowchart illustrating a detection method according to a third embodiment of the present disclosure.

[0030] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar elements will be indicated by the same or similar reference numerals throughout the accompanying drawings. DETAILED DESCRIPTION

[0031] The following detailed description is provided to help gain a comprehensive understanding of the methods, devices and / or systems described herein. However, the order of operations described herein is only an example and is not limited to those orders set forth herein, but may be equivalently replaced or changed except for operations that must occur or be performed in a specific order. In addition, for greater clarity and simplicity, the description of content known in the art will be omitted or simplified.

[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0033] Unless otherwise specified, the same reference numerals generally refer to the same elements (e.g., components, steps, and methods). Reference numerals described in the previous embodiments may be omitted if they appear again in the subsequent embodiments. In addition, the technical features described in different or the same embodiments may be combined in any manner, as long as the combined embodiments or technical solutions are complete and can solve the technical problems of the present application or achieve the technical effects described or not described in the present disclosure but can be determined based on the above complete technical solutions. The terms used in the present disclosure are explained below.

[0034] 1) Inspection: When conducting product quality control, various testing, measuring tools and methods are applied to check the characteristics of the product and compare them with the specified standards to determine whether it meets the specifications.

[0035] 2) Current transformer: An instrument that converts a large primary current into a small secondary current for measurement based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and a winding. Its primary winding has very few turns and is connected in series in the circuit where the current needs to be measured.

[0036] 3) Yaw system: A part of the wind turbine nacelle, also known as the wind-facing device. The yaw system of a wind turbine is a component that orients the nacelle of the wind turbine toward the wind direction. The yaw system is equipped with a yaw motor that can rotate the nacelle of the wind turbine against the fixed tower.

[0037] The present disclosure utilizes the characteristics of hierarchical control of the yaw system and the need to return the position of the cabin (for example, return to the original position) after the angle rotation (yaw to the left, yaw to the right) during the yaw test, and provides a detection circuit, detection method and detection device for a yaw motor. Specifically, during yaw, the average current of yaw to the left and yaw to the right is analyzed to identify the actual operation of the yaw motor in the yaw system. The following will be described in detail in conjunction with the preferred embodiments of the present disclosure.

[0038] Figure 1 is a schematic diagram showing a detection circuit according to an embodiment of the present disclosure.

[0039] The detection circuit according to the embodiment of the present disclosure can be used to detect the yaw motor of the yaw system of the wind turbine generator set. The yaw motor of the present disclosure may include a first group of yaw motors and a second group of yaw motors. The number of yaw motors in each group of yaw motors (refer to Figure 1 , the number of yaw motors in each group is 4) is not specifically limited. In addition, the yaw motors can be divided into three groups, four groups or more groups. That is, the yaw motors of the present disclosure can include a third group of yaw motors, a fourth group of yaw motors, a fifth group of yaw motors, etc. in addition to the first group of yaw motors and the second group of yaw motors. The preferred installation method of the yaw motors is to be distributed around the yaw gear at equal angular intervals to balance the torque during the yaw process.

[0040] Reference Figure 1 According to an embodiment of the present disclosure, the detection circuit may include a first contactor 903KM1, a second contactor 903KM2, a third contactor 903KM3, and a fourth contactor 903KM4, and a current detector 901TA1. In addition, the detection circuit according to an embodiment of the present disclosure may also include a controller (e.g., a programmable logic controller).

[0041] The first contactor 903KM1 , the second contactor 903KM2 , the third contactor 903KM3 , and the fourth contactor 903KM4 may be electrically connected to the yaw motor 100 to be detected, respectively.

[0042] The first contactor 903KM1 can be electrically connected between the first group of yaw motors 110 in the yaw motor 100 and the AC power supply and is used to control the first group of yaw motors to rotate forward, that is, when the first contactor 903KM1 is energized, the first group of yaw motors 110 rotates forward. As an example, the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the first input terminal, the second input terminal and the third input terminal of each yaw motor in the first group of yaw motors 110 through the first contactor 903KM1; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the first input terminal, the second input terminal and the third input terminal of each yaw motor in the second group of yaw motors 120 through the third contactor 903KM3; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal and the first input terminal of each yaw motor in the first group of yaw motors 110 through the second contactor 903KM2; the A-phase line, B-phase line and C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal and the first input terminal of each yaw motor in the second group of yaw motors 120 through the fourth contactor 903KM4.

[0043] The second contactor 903KM2 can be electrically connected between the first set of yaw motors 110 and the AC power supply, and connected in parallel with the first contactor 903KM1, for controlling the reverse rotation of the first set of yaw motors 110. That is, when the second contactor 903KM2 is closed, the first set of yaw motors 110 rotates reversely.

[0044] The third contactor 903KM3 can be electrically connected between the second group of yaw motors 120 in the yaw motor 100 and the AC power supply to control the second group of yaw motors to rotate forward, that is, when the third contactor 903KM3 is energized, the second group of yaw motors 120 rotate forward.

[0045] The fourth contactor 903KM4 can be electrically connected between the second group of yaw motors 120 and the AC power supply. The fourth contactor 903KM4 can be connected in parallel with the third contactor 903KM3 to control the second group of yaw motors to rotate in reverse. That is, when the fourth contactor 903KM4 is energized, the second group of yaw motors 120 rotate in reverse.

[0046] As described above, the present disclosure provides a set of contactors, which can be used to start different yaw motors respectively, so that the magnitude of the current during forward and reverse yaw can be judged. The magnitude of the current can be detected by a current detector.

[0047] Reference Figure 1, the current detector 901TA1 can be electrically connected to a common power supply path for the AC power supply to power the first group of yaw motors 110 and the second group of yaw motors 120. In addition, the detection circuit of the present disclosure may also include a main power supply switch 901F1, which can be electrically connected between the current detector 901TA1 and the AC power supply. As an example, the current detector 901TA1 can be a current transformer and can be electrically connected to a programmable logic controller (PLC). In addition, the current detector 901TA1 can also be an electric energy meter, etc., and can be communicatively connected to the programmable logic controller.

[0048] The current detector 901TA1 can detect the first detection current of the common power supply path when the first contactor 903KM1 and the third contactor 903KM3 are connected (at this time, the second contactor 903KM2 and the fourth contactor 904KM4 are not connected, the corresponding motor does not start running, and only passively rotates), and can detect the second detection current of the common power supply path when one of the second contactor 903KM2 and the fourth contactor 903KM4 is connected (at this time, the other of the second contactor 903KM2 and the fourth contactor 903KM4 and the first contactor KM1 and the third contactor KM3 are not connected, the corresponding motor does not start running, and the corresponding motor only passively rotates). In other words, the second detection current is the loop current (the total current of some yaw motors) when the first group of yaw motors are reverse yawed.

[0049] That is, the current detector 901TA1 can detect the total current (first detection current) when the first yaw motor 110 and the second yaw motor 120 are yawed forward at the same time, and can also detect the current (second detection current) when the first yaw motor 110 or the second yaw motor 120 is yawed backward.

[0050] The attraction of the first contactor, the second contactor, the third contactor, and the fourth contactor can be controlled by the maintenance personnel or by the controller (for example, a programmable logic controller). The maintenance personnel can judge whether there is a non-working yaw motor based on the magnitude of the first detection current and the second detection current. In addition, it is also possible to judge whether there is a non-working yaw motor by the controller. At this time, the first contactor, the second contactor, the third contactor, and the fourth contactor can be controlled by the controller. The non-operation here may be caused by contactor failure, yaw motor not connected to the circuit, other power supply line failure, yaw motor damage (for example, phase loss), etc. In addition, the detection circuit of the present disclosure may also include an indication circuit (for example, a display unit, an indicator light, etc.), and the judgment result of the controller can be displayed via an indicator light or a display unit. For example, when the controller judges that there is a non-working yaw motor, the indicator light can be controlled to light up, and the number of non-working yaw motors can be displayed through the display unit. The principle of judging whether there is a non-working yaw motor based on the magnitude of the current value is briefly described below.

[0051] Assuming that the current of each yaw motor after startup and stabilization (not counting the current at the moment of startup) is 3A (this is just an example, and it is not necessary to know the current value of each yaw motor during actual detection), under normal circumstances, when the 8 yaw motors are working (forward yaw), the current is 24A. By reverse calculation, it can be calculated that if the total loop current is 24A, the average value is 3A. In reverse yaw, the total current of the 4 yaw motors when working will be 12A, and the two can correspond or coincide.

[0052] Reference Figure 1 ,if Figure 1 One of the yaw motors in the second group of yaw motors 120 is not working. Since the total number of yaw motors that are working normally is reduced, when the eight yaw motors are in forward yaw (the first yaw), the total current I1 is 21A, and the average value is 2.625A. When four of the yaw motors (the first group of yaw motors) are in reverse yaw (the second yaw), the loop current I2 is 12A, that is, the current average values ​​are different. At this time, it can be determined that not all yaw motors in the second group of yaw motors are working. Similarly, if the loop current I3 of the second group of yaw motors in reverse yaw (the third yaw) is 12A, it means that there is a non-working yaw motor in the first group of yaw motors.

[0053] Furthermore, if Figure 1If one of the yaw motors in the first group of yaw motors 110 is out of phase, the total current will increase. For example, during the first yaw, the total current I1 is 28A, and the average value is 3.5A. During the second yaw (the first group of yaw motors yaw in reverse), if the four yaw motors in the first group of yaw motors are working normally, the loop current I2 will be 12A, that is, the average values ​​are 3.5A and 3A respectively, which are different. At this time, it can be determined that not all yaw motors in the second group of yaw motors are working. Similarly, if the loop current I3 of the second group of yaw motors is 12A during reverse yaw (the third yaw), it means that there is a non-working yaw motor in the first group of yaw motors.

[0054] In addition, if more yaw motors are not working, the difference between the average value of I1 and the average values ​​of I2 and I3 will be further increased, so it can be more easily identified and detected.

[0055] Although not shown, the controller of the present invention can send control signals to the first contactor, the second contactor, the third contactor and the fourth contactor to control the on and off (closing and disconnecting) of the first contactor, the second contactor, the third contactor and the fourth contactor. The controller can also receive a first detection current and a second detection current, and determine whether there is an inoperative yaw motor in the yaw motor according to the magnitude of the first detection current and the second detection current.

[0056] Specifically, the controller may divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, and divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, compare the first average value with the second average value, and determine whether there is a non-working yaw motor in the yaw motors according to the comparison result. The specific comparison method may be based on the comparison between the ratio (or difference) between the average values ​​and the threshold value to determine whether there is a non-working yaw motor.

[0057] The above-mentioned positive yaw can make the yaw system (for example, the yaw bearing) yaw from the first position (starting position) to the second position (predetermined position), and the reverse yaw can be the yaw from the second position to the first position. The reverse yaw can be divided into multiple times, that is, it can reverse yaw to the middle position between the first position and the second position, and then reverse yaw to the first position once or multiple times.

[0058] The current detector can detect the above-mentioned second detection current when a corresponding one of the first group of yaw motors and the second group of yaw motors starts to operate (the corresponding contactor is turned on) and reversely yaws the yaw system from a predetermined position (for example, the first position of the yaw bearing) to an intermediate position, and detect a third detection current of the common power supply path when a corresponding one of the first group of yaw motors and the second group of yaw motors continues to start (the corresponding contactor is turned on again) after stopping at the intermediate position for a predetermined time to make the yaw system further reversely yaw from the intermediate position to the initial position.

[0059] The controller is configured to determine whether there is a non-working yaw motor in the yaw motor according to the magnitude of the first detection current, the second detection current and the third detection current. As an example, the controller may divide the second detection current by the number of yaw motors in the corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the third detection current by the number of yaw motors in the corresponding one to obtain a third average value, compare the first average value with the second average value and the third average value respectively, and determine whether there is a non-working yaw motor in the yaw motor according to the comparison result. For example, if the three are equal (approximately equal within the error range), it means that the yaw motors are all normal. If they are not equal, it means that there is a non-working yaw motor. Whether the non-working yaw motor is in the first group of yaw motors or the second group of yaw motors can be judged based on the above principle according to the specific size relationship. If the second average value and the third average value are not equal, it means that the yaw motor or the circuit of the yaw motor of the corresponding one may fail during the testing, detection, and inspection process.

[0060] As an example, the current detector can detect a second detection current when starting a certain group of yaw motors to make the yaw system yaw in the opposite direction from a predetermined position to an intermediate position, and can detect a fourth detection current of the common power supply path when turning off this group of yaw motors (turning off the corresponding contactors) and starting another group of yaw motors (starting the corresponding contactors), and making the yaw system yaw in the opposite direction from the intermediate position to the initial position. As an example, during detection, it is not required to yaw in the opposite direction to the starting position. The cabin position is automatically returned to its original position during the detection process (that is, the angle values ​​of the yaw rotation in the forward and reverse directions are equal. In actual testing, whether the total yaw time in the forward direction is the same as the total yaw time in the reverse direction is used to determine whether the angle values ​​are the same (the rotation speed of the yaw motor is the same). For details, please refer to the following Figure 4 ), which can ensure the safety of the cabin mechanical support.

[0061] The controller may determine whether there is a non-operating yaw motor among the yaw motors according to the magnitudes of the first detection current, the second detection current, and the fourth detection current.

[0062] As an example, the controller may divide the second detection current by the number of yaw motors in the corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the fourth detection current by the number of yaw motors in the other to obtain a fourth average value, compare the first average value with the second average value and the fourth average value, respectively, and determine whether there is a non-working yaw motor in the yaw motor according to the comparison result. If the three are equal (approximately equal within the error range), it means that the yaw motors are all normal. If they are not equal, it means that there is a non-working yaw motor. Whether the non-working yaw motor is in the first group of yaw motors or the second group of yaw motors can be judged based on the above principle according to the specific size relationship. In addition, further judgment can be made in combination with specific empirical values ​​under normal working conditions.

[0063] The first detection current, the second detection current, the third detection current, and the fourth detection current as described above can all be currents of the corresponding yaw motor in the stable stage after startup. When the controller determines whether there is a non-working current, the first detection current, the second detection current, the third detection current, and the fourth detection current can all be average currents over a period of time.

[0064] When it is determined that one of the first group of yaw motors and the second group of yaw motors has a non-working yaw motor, it is subsequently possible to manually check which yaw motor is not working and find the reason for the non-working. The first group of yaw motors that are not working can also be divided into two groups again. In this way, the range of non-working yaw motors can be further narrowed. In addition, the detection circuit, detection method and detection device disclosed in the present invention can also determine the number of non-working yaw motors. The specific principle is briefly described as follows.

[0065] Assume that the current of each yaw motor after stabilization is I, the number of non-working yaw motors in the first group of yaw motors or the second group of yaw motors is x, and assume that the total number of yaw motors is 8, then:

[0066] (8-x)×I=I1 Formula (1)

[0067] 4×I=I2 Formula (2) Through the above formula (1) and (formula) 2, we can get formula (3)

[0068] (8-x) / (4)=I1 / I2; Formula 3)

[0069] Taking the above assumed data as an example, I1 / I2=21 / 12=1.75, we get 8-x=7, and we can get x=1, that is, one yaw motor is not working.

[0070] In addition, when the total number of yaw motors is an odd number (such as the number of the first group of yaw motors is 4, the number of the second group of yaw motors is 3, and the total number is 7), even if Figure 1 If one of the two yaw motors does not work, then I1 = (7-2) * 3 = 13A, and the average is 15 / 7 = 2.14A. When a certain group of yaw motors yaws alone, the current value is 3*3 = 9A, and the average is 9 / 4 = 2.25A. The averages 2.25 and 2.14 also have deviations. In this case, the yaw motor does not work can also be effectively detected. The specific deviation threshold of the yaw motor does not work can be determined in advance. The specific detection method of the present invention is described below.

[0071] Figure 2 is a flow chart showing a detection method according to a first embodiment of the present disclosure, Figure 3 is a flowchart illustrating a detection method according to a second embodiment of the present disclosure.

[0072] The detection method according to the embodiment of the present disclosure may utilize the above detection circuit to execute various steps, and the specific steps may include step S210, step S220 and step S230.

[0073] In step S210, the first contactor and the third contactor are turned on, and a first detection current of the common power supply path is detected. As described above, the first contactor and the third contactor can be turned on manually or by a controller, and the first detection current of the common path can be detected.

[0074] In step S220, one of the second contactor and the fourth contactor is turned on, and the second detection current of the common power supply path is detected. Similarly, one of the second contactor and the fourth contactor can be turned on manually or by a controller, and the second detection current of the common path can be detected.

[0075] In step S230, it is determined whether there is a non-working yaw motor in the yaw motor according to the magnitude of the first detection current and the second detection current. The judgment can be made according to the magnitude relationship between the absolute value of the difference between the two and the predetermined threshold. When the absolute value of the difference between the two is less than the predetermined threshold, it means that the two are basically the same and there is no non-working current. When the absolute value of the difference between the two is greater than or equal to the predetermined threshold, there is a non-working yaw motor.

[0076] Specific reference Figure 3 The step of determining whether there is a non-working yaw motor in the yaw motor according to the magnitudes of the first detection current and the second detection current may include step S231, step S232, step S233 and step S234.

[0077] In step S231 , the first detection current is divided by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value.

[0078] In step S232, the second detection current is divided by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value;

[0079] In step S233, the first average value is compared with the second average value;

[0080] In step S234, it is determined whether there is a non-operating yaw motor among the yaw motors according to the comparison result. The specific determination method may be as described above and will not be described in detail here.

[0081] Figure 4 is a flowchart illustrating a detection method according to a third embodiment of the present disclosure.

[0082] The detection method according to the third embodiment of the present disclosure may include step S201 , step S202 , step S2013 , step S204 , step S205 , step S206 , step S207 , step S208 , and step S209 .

[0083] In step S201, it can be determined whether the yaw enabling and brake release are normal. The purpose of this step is to detect whether the yaw system brake release is normal. If the yaw is abnormal, the yaw is not allowed to be started.

[0084] In step S202, it is determined whether the manual yaw test is normal. The purpose of this step is to manually test whether the yaw can be started normally, and to remind the personnel to pay attention to the environment around the cabin. If it is normal, the yaw is started. If it is not normal, the yaw is not allowed to be started (end control).

[0085] In step S203, the left yaw is started, and the controller collects the total current I1, which can be closed as described above. Figure 1 The first contactor 903KM1 and the third contactor 903KM3 are shown yawed to the left (positive yaw).

[0086] In step S204, it is determined whether the yaw time T has been reached. The yaw time T can be reasonably set according to the environment around the cabin and the support conditions of the cabin, and the time T here refers to the yaw time, that is, the time when the yaw speed is not zero.

[0087] In step S205, stop for time t, start the first right yaw, close a contactor, collect the loop current I2, for example, you can close Figure 1 The second contactor 903KM2 shown starts right yaw (reverse yaw), and the duration of t can be freely set. Here, before reverse yaw, it is necessary to stop for a certain time to reduce the impact of the yaw motor.

[0088] In step S206, it is determined whether the yaw time reaches T / 2 (the time during which the yaw speed is not 0).

[0089] In step S207, stop time t2, start the second right yaw, close another contactor, and collect the loop current I3. Figure 1 The fourth contactor 903KM4 shown starts yaw to the right again, and the duration of t2 can also be freely set.

[0090] In step S208, it is determined whether the yaw time reaches T / 2, that is, the vehicle yaws rightward again by T / 2.

[0091] In step S209, the average values ​​of the currents I1, I2, and I3 are compared to analyze the state of the yaw motor. As described above, the average value of the current refers to the total current of the loop at each yaw divided by the preset number of yaw motor starts. Each step of the above detection method can be implemented by a corresponding software or hardware module or unit.

[0092] The detection device of the yaw motor of the yaw system of the present disclosure may include the above detection circuit. In addition, the yaw system of the present disclosure may include multiple yaw motors and the above detection circuit, and the multiple yaw motors may not be connected to a transmission chain including a reducer.

[0093] The above has been referred to Figures 1 to 4 The detection method and detection device according to the exemplary embodiments of the present disclosure are described. However, it should be understood that the devices and systems shown in the drawings can be configured as software, hardware, firmware or any combination of the above items to perform specific functions. For example, these systems and devices may correspond to dedicated integrated circuits, pure software codes, or modules that combine software and hardware. In addition, one or more functions implemented by these systems or devices may also be uniformly performed by components in physical entity devices (e.g., processors, clients, or servers, etc.).

[0094] For example, according to an exemplary embodiment of the present disclosure, a computer-readable storage medium storing instructions may be provided, wherein when the instructions are executed by at least one computing device, the at least one computing device is prompted to perform at least one of the above steps.

[0095] It should be noted that the detection method and detection device according to the exemplary embodiments of the present disclosure may rely on the execution of computer programs or instructions to implement corresponding functions, that is, each device corresponds to each step in the functional architecture of the computer program, so that the entire system is called through a special software package (for example, lib library) to implement the corresponding function.

[0096] On the other hand, when the system and apparatus are implemented in software, firmware, middleware or microcode, the program code or code segment for performing the corresponding operation may be stored in a computer-readable medium such as a storage medium, so that at least one processor or at least one computing device may perform the corresponding operation by reading and running the corresponding program code or code segment. In addition, the computer-readable medium or storage medium may cause the processor to execute the above-mentioned detection method when the computer program is executed by the processor.

[0097] For example, according to an exemplary embodiment of the present disclosure, a computer device including a readable medium storing computer program instructions may be provided, wherein the instructions, when executed by at least one computing device, prompt the at least one computing device to perform at least one of the above steps.

[0098] In addition, the present disclosure may provide an electronic device, which may include: a processor; and a memory storing a computer program, which, when executed by the processor, prompts the processor to execute the above-mentioned detection method.

[0099] By using the detection circuit according to the embodiment of the present disclosure, it is possible to detect whether the yaw motor is working.

[0100] The detection circuit according to the embodiment of the present disclosure can accurately determine the number of non-operating yaw motors.

[0101] Using the detection circuit according to the embodiment of the present disclosure can reduce the cost of equipment.

[0102] The detection circuit according to the embodiment of the present disclosure can realize the automation of the yaw motor detection of the wind turbine generator set, ensure the standardization of detection and compliance and judgment basis, reduce the workload of personnel, and further ensure the factory quality.

Claims

1. A detection circuit for a yaw motor of a yaw system, characterized in that: The yaw motor includes a first group of yaw motors and a second group of yaw motors, and the detection circuit includes: a first contactor, electrically connected between the first set of yaw motors and an AC power source and used to control the first set of yaw motors to rotate in a forward direction; a second contactor, electrically connected between the first set of yaw motors and the AC power supply, connected in parallel with the first contactor and used to control the first set of yaw motors to rotate in reverse; a third contactor, electrically connected between the second set of yaw motors and the AC power supply and used to control the second set of yaw motors to rotate forward; a fourth contactor, electrically connected between the second set of yaw motors and the AC power supply, connected in parallel with the third contactor and used to control the second set of yaw motors to rotate in reverse; A current detector is electrically connected to a common power supply path through which the AC power supply powers the first group of yaw motors and the second group of yaw motors, detects a first detection current of the common power supply path when the first contactor and the third contactor are turned on, and detects a second detection current of the common power supply path when one of the second contactor and the fourth contactor is turned on.

2. The detection circuit of the yaw motor of the yaw system according to claim 1, characterized in that: The detection circuit also includes a controller, which sends a control signal to the first contactor, the second contactor, the third contactor and the fourth contactor to control the on and off of the first contactor, the second contactor, the third contactor and the fourth contactor, receives the first detection current and the second detection current, and determines whether there is an inoperative yaw motor in the yaw motor according to the magnitude of the first detection current and the second detection current.

3. The detection circuit of the yaw motor of the yaw system according to claim 2, characterized in that: The controller is configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, and divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, compare the first average value with the second average value, and determine whether there is an inoperative yaw motor among the yaw motors based on the comparison result.

4. The detection circuit of the yaw motor of the yaw system according to claim 2, characterized in that: the current detector detects the second detection current when one of the second contactor and the fourth contactor is turned on to cause the yaw system to reversely yaw from a predetermined position to an intermediate position, and detects a third detection current of the common power supply path when one of the second contactor and the fourth contactor is turned on again to cause the yaw system to further reversely yaw from the intermediate position to an initial position after the yaw system stops at the intermediate position for a predetermined time, The controller is configured to determine whether there is an inoperative yaw motor among the yaw motors according to magnitudes of the first detection current, the second detection current, and the third detection current.

5. The detection circuit of the yaw motor of the yaw system according to claim 4, characterized in that: The controller is further configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the third detection current by the number of yaw motors in the corresponding one to obtain a third average value, compare the first average value with the second average value and the third average value, respectively, and determine whether there is an inoperative yaw motor among the yaw motors based on the comparison results.

6. The detection circuit of the yaw motor of the yaw system according to claim 2, characterized in that: the current detector detects the second detection current when one of the second contactor and the fourth contactor is turned on to reversely yaw the yaw system from a predetermined position to an intermediate position, and detects a fourth detection current of the common power supply path when the other of the second contactor and the fourth contactor is turned on to reversely yaw the yaw system from the intermediate position to an initial position, The controller is configured to determine whether there is an inoperative yaw motor among the yaw motors according to magnitudes of the first detection current, the second detection current, and the fourth detection current.

7. The detection circuit of the yaw motor of the yaw system according to claim 6, characterized in that: The controller is further configured to divide the first detection current by the total number of yaw motors in the first group of yaw motors and the second group of yaw motors to obtain a first average value, divide the second detection current by the number of yaw motors in a corresponding one of the second contactor and the fourth contactor to obtain a second average value, divide the fourth detection current by the number of yaw motors in the other one to obtain a fourth average value, compare the first average value with the second average value and the fourth average value, respectively, and determine whether there is an inoperative yaw motor among the yaw motors based on the comparison results.

8. The detection circuit of the yaw motor of the yaw system according to any one of claims 1 to 7, characterized in that: The A-phase line, the B-phase line, and the C-phase line of the AC power supply are electrically connected to the first input terminal, the second input terminal, and the third input terminal of each yaw motor in the first group of yaw motors through the first contactor; The A-phase line, the B-phase line, and the C-phase line of the AC power supply are electrically connected to the first input terminal, the second input terminal, and the third input terminal of each yaw motor in the second group of yaw motors through the third contactor; The A-phase line, the B-phase line, and the C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal, and the first input terminal of each yaw motor in the first group of yaw motors through the second contactor; The A-phase line, the B-phase line, and the C-phase line of the AC power supply are electrically connected to the third input terminal, the second input terminal, and the first input terminal of each yaw motor in the second group of yaw motors through the fourth contactor.

9. The detection circuit of the yaw motor of the yaw system according to any one of claims 1 to 7, characterized in that: The first detection current and the second detection current are both currents of the corresponding yaw motor in a stable stage after startup.

10. A method for detecting a yaw motor of a yaw system, characterized in that: The detection method uses the detection circuit according to any one of claims 1 to 9 to perform the following steps: connecting the first contactor and the third contactor, and detecting a first detection current of a common power supply path, turning on one of the second contactor and the fourth contactor and detecting a second detection current of the common power supply path, It is determined whether there is an inoperative yaw motor in the yaw motors according to the magnitudes of the first detection current and the second detection current.

11. A detection device for a yaw motor of a yaw system, characterized in that: The detection device comprises a detection circuit according to any one of claims 1 to 9.

12. A yaw system, characterized in that: The yaw system comprises a plurality of yaw motors and a detection circuit according to any one of claims 1 to 9, wherein the plurality of yaw motors are not connected to a transmission chain including a speed reducer.

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