Automatic detection circuit and automatic detection method for executing mechanism

Abstract

The invention provides an automatic detection circuit and an automatic detection method of an execution mechanism. The automatic detection circuit comprises a first contactor and a second contactor which are electrically connected between a first execution mechanism to be detected and a power supply and between a second execution mechanism to be detected and the power supply respectively; the current detector is electrically connected to a common power supply path of the power supply to the first execution mechanism and the second execution mechanism so as to detect a first current flowing through the first execution mechanism under the condition that only the first contactor is switched on or detect a second current flowing through the second execution mechanism under the condition that only the second contactor is switched on; the controller firstly controls the first contactor to be connected and controls the second contactor to be disconnected so as to determine whether the first executing mechanism is normal or not according to the first current; and then controlling the first contactor to be disconnected and controlling the second contactor to be connected so as to determine whether the second actuator is normal according to the second current. The automatic detection circuit can detect whether the execution mechanism is normal or not.

Description

Technical Field

[0001] The present disclosure relates to the field of detection, and in particular, to an automatic detection circuit and an automatic detection method for an actuator. Background Art

[0002] In order to ensure the stable operation of wind turbines (also known as fans, units, wind turbines, etc.), the assistance of various actuators is required. Actuators include key equipment of wind turbines, such as gearboxes, heaters, cooling fans, cooling pumps, etc. If the actuator is abnormal, the wind turbine will be triggered to shut down or fail to start. In addition, if the factory testing of these actuators is not sufficient, the unit may fail or even fail to work properly after on-site hoisting. Furthermore, if special actuators (for example, lubrication pumps, gear oil pumps) cannot operate normally, it may also cause damage due to lack of lubrication of the rotating machinery.

[0003] Therefore, factory inspection of the actuator's action is an important measure to ensure product quality, improve fan operation reliability, and reduce on-site commissioning and maintenance time.

[0004] At present, the detection of actuators generally adopts the method of manual observation to see whether they are started, which cannot realize automatic detection of processes and functions. In addition, manual observation has the following disadvantages:

[0005] 1) Manual observation depends on the experience of the tester. Some actuators are inside the mechanical parts, and it is not easy to judge whether they are running, whether they are missing a phase, whether they are blocked, etc.

[0006] 2) In the test process, the observation method of personnel is subjective. If the personnel do not observe whether the actuator is started, and click the "Yes" button on the interface, the process will be judged as "test passed". When problems actually occur on site, it is relatively difficult to trace the cause of the problem.

[0007] 3) Manual observation cannot realize automated analysis and detection, the workload is relatively large and there is no comparison standard, and only the current value can be checked. In addition, manual observation often requires the cooperation of multiple people to complete the test.

[0008] 4) When personnel detect the current at a single detection point, it is necessary to frequently change the current detection position, and it may not be easy to place the detection equipment on the circuit of some equipment. In addition, a single detection point cannot be combined with the feedback point of the contactor, and the detection process cannot be fully automated. Summary of the invention

[0009] One of the purposes of the present disclosure is to provide an automatic detection circuit and an automatic detection method capable of detecting whether an actuator is normal.

[0010] According to one aspect of the present disclosure, an automatic detection circuit of an actuator includes a first contactor, electrically connected between a first actuator to be detected and a power supply; a second contactor, electrically connected between a second actuator to be detected and a power supply; a current detector, electrically connected to a common power supply path of the power supply to the first actuator and the second actuator, to detect a first current flowing through the first actuator when only the first contactor of the first contactor and the second contactor is turned on, or to detect a second current flowing through the second actuator when only the second contactor of the first contactor and the second contactor is turned on; a controller, configured to first control the first contactor to be turned on and the second contactor to be turned off, to determine whether the first actuator is normal according to the first current; and then control the first contactor to be turned off and the second contactor to be turned on, to determine whether the second actuator is normal according to the second current.

[0011] According to an embodiment of the present disclosure, the controller may be further configured to: determine whether the first actuator is normal according to the first current and the feedback signal of the first contactor, and determine whether the second actuator is normal according to the second current and the feedback signal of the second contactor.

[0012] According to an embodiment of the present disclosure, the controller may be further configured to: determine whether the first actuator is normal based on a first maximum value of the first current within a first predetermined time period since the first contactor is turned on and a second maximum value of the first current within a second predetermined time period after the first predetermined time period; determine whether the second actuator is normal based on a third maximum value of the second current within the first predetermined time period since the second contactor is turned on and a fourth maximum value of the second current within the second predetermined time period after the first predetermined time period.

[0013] According to an embodiment of the present disclosure, the controller may be further configured to: in response to a ratio of the first maximum value to the second maximum value being greater than or equal to a first predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is normal; in response to a ratio of the third maximum value to the fourth maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is normal; in response to a ratio of the first maximum value to the second maximum value being less than the first predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is abnormal; in response to a ratio of the third maximum value to the fourth maximum value being less than the first predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is abnormal.

[0014] According to an embodiment of the present disclosure, the controller may be further configured to: in response to the ratio of the first maximum value to the second maximum value being less than the second predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is stuck; in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is missing a phase or is poorly connected; in response to the ratio of the third maximum value to the fourth maximum value being less than the second predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is stuck; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is missing a phase or is poorly connected, wherein the first predetermined threshold is greater than the second predetermined threshold.

[0015] According to an embodiment of the present disclosure, the controller may be further configured to: in response to the feedback signal of the first contactor having a low level, determine that the detection circuit of the first actuator is abnormal; in response to the feedback signal of the second contactor having a low level, determine that the detection circuit of the second actuator is abnormal.

[0016] According to an embodiment of the present disclosure, the current detector may be a transformer or an electric energy meter, the transformer is electrically connected to the controller, and the electric energy meter is communicatively connected to the controller.

[0017] According to an embodiment of the present disclosure, each of the first actuator and the second actuator may be a hydraulic pump, a lubricating oil pump, a cooling fan, a heater, a cooling pump, a yaw motor, or a pitch motor.

[0018] According to an embodiment of the present disclosure, the controller may be a programmable logic controller, the current detector is electrically connected to an analog input channel of the programmable logic controller, or the current detector is communicatively connected to a central processing unit of the programmable logic controller, the first digital output channel of the programmable logic controller is electrically connected to the coil of the first contactor, and the second digital channel of the programmable logic controller is electrically connected to the coil of the second contactor.

[0019] According to a second aspect of the present disclosure, an automatic detection method for an actuator may include: controlling a first contactor to be turned on and controlling a second contactor to be turned off, the first contactor being electrically connected between a first actuator to be detected and a power supply, and the second contactor being electrically connected between a second actuator to be detected and a power supply; detecting a first current flowing through the first actuator; controlling the first contactor to be turned off and controlling the second contactor to be turned on; detecting a second current flowing through the second actuator; determining whether the first actuator is normal based on the first current; and determining whether the second actuator is normal based on the second current.

[0020] According to an embodiment of the present disclosure, the step of determining whether the first actuator is normal based on the first current may include: determining whether the first actuator is normal based on the first current and a feedback signal of the first contactor; the step of determining whether the second actuator is normal based on the second current includes: determining whether the second actuator is normal based on the second current and a feedback signal of the second contactor.

[0021] According to an embodiment of the present disclosure, the step of determining whether the first actuator is normal based on the first current and the feedback signal of the first contactor may include: determining whether the first actuator is normal based on the first maximum value of the first current within the first predetermined time period since the first contactor is turned on and the second maximum value of the first current within the second predetermined time period after the first predetermined time period; the step of determining whether the second actuator is normal based on the second current and the feedback signal of the second contactor may include: determining whether the second actuator is normal based on the third maximum value of the second current within the first predetermined time period since the second contactor is turned on and the fourth maximum value of the second current within the second predetermined time period after the first predetermined time period.

[0022] According to an embodiment of the present disclosure, in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the first contactor having a high level, it can be determined that the first actuator is normal; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the second contactor having a high level, it can be determined that the second actuator is normal; in response to the ratio of the first maximum value to the second maximum value being less than the first predetermined threshold and the feedback signal of the first contactor having a high level, it can be determined that the first actuator is abnormal; in response to the ratio of the third maximum value to the fourth maximum value being less than the first predetermined threshold and the feedback signal of the second contactor having a high level, it can be determined that the second actuator is abnormal.

[0023] According to an embodiment of the present disclosure, in response to the ratio of the first maximum value to the second maximum value being less than the second predetermined threshold and the feedback signal of the first contactor having a high level, it can be determined that the first actuator is blocked; in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the first contactor having a high level, it can be determined that the first actuator is phase-missing or poorly connected; in response to the ratio of the third maximum value to the fourth maximum value being less than the second predetermined threshold and the feedback signal of the second contactor having a high level, it can be determined that the second actuator is blocked; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the second contactor having a high level, it can be determined that the second actuator is phase-missing or poorly connected, wherein the first predetermined threshold is greater than the second predetermined threshold.

[0024] According to an embodiment of the present disclosure, each of the first actuator and the second actuator may be an actuator including a motor.

[0025] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, which stores a program or instruction. When the program or instruction is executed by a processor, the above-mentioned automatic detection method is implemented.

[0026] According to the automatic detection circuit and automatic detection method of the actuator of the embodiment of the present disclosure, only one actuator structure is actuated at a time, so the total current in the circuit is the current of a single actuator, thereby avoiding interference from other detection signals.

[0027] According to the embodiments of the present disclosure, the automatic detection circuit and the automatic detection method of the actuator can adapt to different actuators, that is, after the actuator changes and the current characteristics change, the actuator can detect whether it is operating normally through the characteristics of its own starting current, without setting fixed detection parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a circuit diagram showing an automatic detection circuit according to a first embodiment of the present disclosure;

[0030] Figure 2 is a circuit diagram showing an automatic detection circuit according to a second embodiment of the present disclosure;

[0031] Figure 3 is a timing diagram showing current detection according to an embodiment of the present disclosure;

[0032] Figure 4 is a graph showing the current when the actuator is normal;

[0033] Figure 5 is a graph showing the current when the actuator is locked;

[0034] Figure 6 It is a curve diagram showing the current when the actuator is missing a phase or is virtual connected;

[0035] Figure 7 is a flow chart showing an automatic detection method according to a first embodiment of the present disclosure;

[0036] Figure 8 is a flow chart showing an automatic detection method according to a second embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] The embodiments will now be described in detail with reference to the accompanying drawings. However, such a description should not be understood as limiting the embodiments of the present disclosure to the embodiments described herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more, and generalizations involving quantities are enumerated generalizations.

[0039] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure. The relevant terms in the present disclosure will be briefly described below.

[0040] 1) Inspection or testing: refers to the use of various tests, measurement tools and methods to check the characteristics of products when conducting product quality control, compare them with the prescribed standards, and determine whether they meet the specifications.

[0041] 2) Starting current: refers to the impact current of electrical equipment (including inductive load) when it is just started. It is the current in a short period of time from the moment the motor or inductive load is powered on to the moment it runs smoothly. This current is generally 4-7 times the rated current. For the safe operation of the line and the normal operation of other electrical equipment, high-power motors need to be equipped with starting devices to reduce the starting current.

[0042] 3) Actuator: refers to the use of liquid, gas, electricity or other energy and converting it into a driving effect through a motor, cylinder or other device. The basic actuator is used to drive the valve to the fully open or fully closed position, or to start the motor or heater. The actuator used to control the valve can accurately move the valve to any position, and the actuator used for rotation control can play a role in oil circulation, heat dissipation or displacement.

[0043] The actuator of the present invention may refer to an actuator including an inductive load (e.g., a motor). These actuators may be powered by an AC power supply. The actuator of the present invention may be an actuator of a wind turbine generator set, which may include a hydraulic pump, a lubricating oil pump, a cooling fan, a heater, a cooling pump, a yaw motor or a pitch motor, etc. However, the automatic detection circuit of the present invention is not limited to detecting the actuator of a wind turbine generator set, but may also be used to detect the actuators of other large components.

[0044] When the actuator is started, the controller can collect and judge the current of the actuator. If the current value increases, decreases, and stabilizes, it is considered that the setting is operating normally. If the current value does not change (the actuator is not started), or the current value continues to be large, it means that the actuator is operating abnormally (for example, phase loss).

[0045] The method disclosed in the present invention for detecting the current of an actuator is: utilizing the starting characteristics of the actuator to detect and judge the current value during startup and operation. Specifically, when the actuator is started, its starting current is generally 4 to 7 times the rated current. However, if only the presence or absence of a current value is detected, it is impossible to determine whether the actuator is operating normally. If only the current value is determined, different actuators have different rated currents, and a single parameter is difficult to adapt to all actuators, which is not conducive to process detection (i.e., if the previous device passes the test, the process of the next device may be stuck or even mistakenly detected as not passing). The automatic detection circuit disclosed in the present invention will be described in detail below.

[0046] The automatic detection circuit of the actuator according to the embodiment of the present disclosure may include at least two contactors, a current detector and a controller, only one of the contactors is turned on at a time, and the current of the actuator connected to the detection circuit by the contactor is detected to determine whether the actuator is normal, or to determine the specific abnormal state of the actuator. The exemplary embodiment will be described in more detail below with reference to the accompanying drawings.

[0047] Figure 1 is a circuit diagram showing an automatic detection circuit according to a first embodiment of the present disclosure, Figure 2 is a circuit diagram showing an automatic detection circuit according to a second embodiment of the present disclosure, Figure 3 is a timing diagram illustrating current detection according to an embodiment of the present disclosure.

[0048] Reference Figure 1 and Figure 2 The automatic detection circuit of the actuator according to the embodiment of the present disclosure may include a first contactor 11 , a second contactor 21 , a current detector 40 , and a controller 30 .

[0049] Reference Figure 1 and Figure 2The first contactor 11 is electrically connected between the first actuator 10 to be detected and a power source, where the power source may be a 400V AC power source, but is not limited thereto.

[0050] The second contactor 21 is electrically connected between the second actuator 20 to be detected and a power source. The power supply of the first actuator 10 and the power supply of the second actuator 20 can be the same power source, but are not limited thereto. For example, they can also be different power sources of the same structure.

[0051] The current detector 40 can be electrically connected to a common power supply path of the power supply to the first actuator 10 and the second actuator 20 to detect a first current flowing through the first actuator 10 when only the first contactor 11 of the first contactor 11 and the second contactor 21 is turned on, or to detect a second current flowing through the second actuator 20 when only the second contactor 21 of the first contactor 11 and the second contactor 21 is turned on.

[0052] Reference Figure 1 The current detector 40 may be a transformer, which may be electrically connected to the controller 30 to transmit the detected first current flowing through the first actuator 10 or the detected second current flowing through the second actuator 20 to the controller 30 for further processing, analysis and / or judgment by the controller 30.

[0053] Reference Figure 2 The current detector 40 may also be an electric energy meter, which may be communicatively connected to the controller 30. The electric energy meter may detect signals such as voltage, current, frequency, and phase in the power supply line, and transmit the data to the controller (e.g., the central processing unit CPU of the programmable logic controller) by means of communication. If there is an electric energy meter in the original control cabinet or it has the function of detecting the voltage, current, frequency, and phase in the power supply line, this device may be used directly for detection without the need for an additional current detector. The current detector 40 of the present disclosure may be an additionally installed current detector, or it may be a detection component existing in the original control cabinet.

[0054] The controller 30 can be a programmable logic controller (PLC), the current detector 40 can be electrically connected to the analog input channel AI of the programmable logic controller, the current detector 40 can also be communicatively connected to the central processing unit CPU of the programmable logic controller, the first digital output channel DO1 of the programmable logic controller can be electrically connected to the coil of the first contactor 11, and the second digital channel DO2 of the programmable logic controller can be electrically connected to the coil of the second contactor 21, that is, the controller 30 can output a control signal to control the attraction of the coil.

[0055] Specific reference Figure 1 and Figure 2, the main contacts of the first contactor 11 can be connected to the power supply and the first actuator 10 to be detected, respectively, and the main contacts of the second contactor 12 can be connected to the power supply and the second actuator 20 to be detected, respectively. At the same time, the feedback signal of the first contactor 11 (for example, 24V power supply) and the feedback signal of the second contactor 21 (for example, 24V power supply) can be respectively connected to the digital input channel DI. Therefore, the controller 30 can determine whether the coil is normally attracted according to the feedback signal of the first contactor 11 and the feedback signal of the second contactor 21, thereby determining whether the detection circuit is normal.

[0056] The controller 30 may be configured to first control the first contactor 11 to be turned on and control the second contactor 21 to be turned off, so as to determine whether the first actuator is normal according to the first current.

[0057] Next, the controller 30 may control the first contactor 11 to be turned off and the second contactor 21 to be turned on, so as to determine whether the second actuator is normal according to the second current.

[0058] That is to say, the controller 30 controls only one of the multiple contactors to be turned on at a time, so that only one of the multiple actuators can be connected to the circuit at a time, and only one actuator is detected at a time, thereby avoiding interference in the detection of each actuator caused by connecting multiple actuators at the same time.

[0059] The controller 30 can determine whether the actuator is normal according to the magnitude of the first current and the second current. Specifically, the controller can determine whether the first actuator and the second actuator are normal according to the maximum current values ​​of the first current and the second current in different time periods, or determine the specific abnormal state under abnormal conditions.

[0060] In the process of executing the judgment, the feedback signal of the contactor can be combined for auxiliary judgment, so as to avoid the detection result of the actuator being affected by the fault of the line or the contactor.

[0061] The controller 30 may be further configured to determine whether the first actuator is normal according to the first current and the feedback signal of the first contactor. The controller 30 may also determine whether the second actuator is normal according to the second current and the feedback signal of the second contactor.

[0062] For example, when the feedback signal has a predetermined level (e.g., a high level), the controller 30 may determine whether the first actuator or the second actuator is normal based on whether the maximum value of the first current or the second current within a certain time period is within a preset range and / or the time within the preset range.

[0063] Specifically, the controller 30 may determine whether the first actuator is normal according to a first maximum value of the first current within a first predetermined time period since the first contactor is turned on and a second maximum value of the first current within a second predetermined time period after the first predetermined time period.

[0064] The first predetermined time period may be within the startup time period of the actuator, and the second predetermined time period may be within the stable operation time period of the actuator, but this is only an example. During detection, there is no need to divide the time periods, but only to continuously detect the detection values ​​within a period of time (including the startup time period and the stable operation time period) since the contactor is turned on to make a judgment. Therefore, there is no need to set fixed detection parameters. The detection process automatically changes with the change of the device type. The automatic detection circuit disclosed in the present invention can make corresponding judgments based on the ratio of the maximum current values ​​in different time periods, and can be applied to a variety of different types of equipment to ensure the normal execution of the detection process. The detection process does not require a complex model, and can effectively prevent interference and false detection caused by signal fluctuations and jumps.

[0065] Similarly, the controller 30 may determine whether the second actuator is normal based on the third maximum value of the second current within the first predetermined time period since the second contactor is turned on and the fourth maximum value of the second current within the second predetermined time period after the first predetermined time period.

[0066] Reference Figure 3 The first time period may be within 300 ms (or 300 ms to 500 ms) from the moment t1 when the first contactor is turned on (ie, the time range from t1 to t2), and the second time period may be any time period after the moment t2.

[0067] That is to say, when the actuator is normal, the ratio of the current in the startup phase to the current in the normal operation phase meets certain conditions. If the condition is met, it means that the actuator is normal, and if the condition is not met, it means that the actuator is abnormal. The present disclosure can determine the specific abnormality type according to the range of the ratio or the change of the ratio.

[0068] In one example, the controller 30 may be further configured to: in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is normal. The first predetermined threshold here may be 2, and the first predetermined threshold may also be a value close to 2 such as 2.1, 1.9, etc., but this is only an example, and the first predetermined threshold may be adjusted as needed.

[0069] When the feedback signal of the first contactor has a high level, it indicates that the first contactor is normally energized and the detection circuit is normal. In this case, when the controller 30 determines that the ratio of the first maximum value to the second maximum value is greater than or equal to the first predetermined threshold, it can be determined that the first actuator is normal.

[0070] Similarly, in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the second contactor having a high level, it is determined that the second actuator is normal.

[0071] On the contrary, the controller may be further configured to: in response to the ratio of the first maximum value to the second maximum value being less than the first predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is abnormal; in response to the ratio of the third maximum value to the fourth maximum value being less than the first predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is abnormal.

[0072] That is to say, when the detection circuit is normal, if the ratio of the maximum values ​​of the currents in different stages is less than a predetermined threshold, it can be determined that the actuator is abnormal.

[0073] Figure 4 is a graph showing the current when the actuator is normal. Figure 5 is a graph showing the current when the actuator is locked. Figure 6 It is a graph showing the current when the actuator is missing a phase or is disconnected.

[0074] Reference Figure 4 , the current curve of the motor when it is normal, the horizontal axis is time, and the vertical axis is the current value (the unit is A, depending on the execution structure, the value may be tens of A or several A).

[0075] from Figure 4 It can be seen that at about -14, the actuator started to start, and the current value instantly reached about 56A, and then the current value dropped to about 15A, indicating that the actuator started and entered a stable operation state. The ratio of the maximum current in the two time periods is about 3.73.

[0076] Reference Figure 5 , Figure 5 This is the current curve when the actuator is blocked. The horizontal axis is time and the vertical axis is current value. Figure 5 It can be seen that at about -4, the actuator started to start, and the current value instantly reached about 85A, and then the current value did not drop. The reason is that the motor was blocked, resulting in a continuous large current value. The ratio of the maximum current in the two time periods is about 1.

[0077] Reference Figure 6 , Figure 6 It is the current curve when the line is not connected. The horizontal axis is time, the vertical axis is current value, and the orange curve and blue curve are the currents of the two motors respectively. It can be seen from the figure that at about -1760, the two actuators started, and the current value instantly reached about 85A, and then the G2 curve dropped to about 18A, while the G1 curve fluctuated greatly for many times. This may be because the power line of the actuator was not connected or the actuator was missing a phase, causing the current value to fluctuate.

[0078] That is to say, when the actuator is normal, the three-phase electricity is a symmetrical load, the three-phase current is equal, and is less than or equal to the rated value; if the actuator is missing a phase when starting, if the load has not changed, that is, the two-phase winding of the actuator (for example, the motor) undertakes the work of the original three-phase winding, and its winding current is 4 to 7 times the rated current, then the current of these two-phase windings will inevitably increase, and the heat generated will be 16 to 49 times the normal temperature rise, because it quickly exceeds the allowable temperature rise and burns the motor; if the actuator is missing a phase during operation, for example, it is missing a phase at full load, the motor is in an overcurrent state, that is, the current exceeds the rated current, the motor will turn into a stalled rotor, and the line current of the unbroken phase will increase more, and even cause the motor to burn quickly.

[0079] According to the above characteristics of the actuator under abnormal conditions, the controller may be further configured to: in response to the ratio of the first maximum value to the second maximum value being less than the second predetermined threshold and the feedback signal of the first contactor having a high level, determine that the first actuator is blocked. The second predetermined threshold here is not specifically limited, and the second predetermined threshold may be 1.5, but this is only an example, and the second predetermined threshold may also be a value greater than or equal to 1 and less than or equal to 1.5.

[0080] The controller may be further configured to determine that the first actuator is phase-lost or virtually connected in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the first contactor having a high level. In other words, the controller may determine that the first actuator is phase-lost or virtually connected when the ratio of the first maximum value to the second maximum value is greater than or equal to 1.5 and less than 2.

[0081] Similarly, the controller can be further configured to: in response to the ratio of the third maximum value to the fourth maximum value being less than the second predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is stuck; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the second contactor having a high level, determine that the second actuator is missing a phase or is weakly connected, wherein the first predetermined threshold is greater than the second predetermined threshold.

[0082] For further judgment of phase loss or virtual connection, it can be judged by whether the ratio of the current maximum values ​​in different time periods is continuously less than the first predetermined threshold value. For example, if the ratio of the first maximum value to the second maximum value (or the ratio of the third maximum value to the fourth maximum value) is continuously less than the first predetermined threshold value (for example, 2), it can be determined that the first actuator or the second actuator is phase-lost. The above ratio can be detected at predetermined time intervals, and counting is performed when the above ratio is less than the first predetermined threshold value. If the counted count value reaches the predetermined value, it means that the above ratio is continuously less than the first predetermined threshold value. If the counted count value does not reach the predetermined value, it means that the above ratio is intermittently less than the first predetermined threshold value, indicating that the actuator is virtual connected (that is, the power line of the actuator is virtual connected).

[0083] The controller can determine that the detection circuit of the first actuator is abnormal, for example, the power supply circuit of the first contactor or the first actuator is abnormal, in response to the feedback signal of the first contactor having a low level; and the controller can determine that the detection circuit of the second actuator is abnormal, for example, the power supply circuit of the second contactor or the second actuator is abnormal, in response to the feedback signal of the second contactor having a low level.

[0084] Specifically, the controller can control the actuator to start at time t1 through the digital output channel. After the actuator is started, within the time t1 to t2 (which can be set to 300 to 500 ms), the controller can detect the maximum value A1 of the current flowing through the actuator, and determine whether the maximum value (i.e., the starting current) is less than the rated current. Then, the controller 30 can clear the maximum value A1, continuously detect the maximum value A2 again, and compare the maximum values ​​at different stages (compare A2 with A1).

[0085] If it is detected that the ratio of A1 to A2 meets the above requirements and the feedback signal of the contactor is received, it can be determined that the execution structure operates normally and the process detection passes.

[0086] If the value of A2 is continuously large, or the ratio of A1 to A2 is continuously less than 1.5, it can be determined that the actuator is blocked (operation abnormality). When determining that the actuator is blocked, the controller can output an alarm message, for example, the controller can control an external alarm to sound an alarm.

[0087] If the ratio of A1 to A2 is less than 2 (greater than or equal to 1.5), or the variance of the current value is large, it can be judged that the actuator is missing a phase or is not connected, and an alarm message is output. If the current value is continuously 0, it is judged that the line is broken (or the power supply is not connected, or the actuator is faulty), and an alarm message is output. The method of distinguishing between the missing phase and the virtual connection of the actuator can be described above, and will not be repeated here.

[0088] Figure 7is a flowchart showing an automatic detection method according to a first embodiment of the present disclosure, Figure 8 is a flow chart showing an automatic detection method according to a second embodiment of the present disclosure.

[0089] Reference Figure 7 According to the first embodiment of the present disclosure, the automatic detection method of the actuator includes step S110, step S120, step S130, step S140, step S150 and step S160.

[0090] In step S110, the first contactor is controlled to be turned on and the second contactor is controlled to be turned off. The first contactor can be electrically connected between the first actuator to be detected and the power supply as described above, and the second contactor can also be electrically connected between the second actuator to be detected and the power supply. The pull-in of the coils of the first contactor and the second contactor can be controlled by the digital output channel of the programmable logic controller.

[0091] In step S120, the first current flowing through the first actuator is detected. As described above, the current flowing through the first actuator can be detected by a current detector such as a transformer or an electric energy meter.

[0092] In step S130, the first contactor is controlled to be disconnected and the second contactor is controlled to be connected. Similarly, the pull-in of the coils of the first contactor and the second contactor can be controlled by the digital output channel of the programmable logic controller, so as to control the first contactor to be disconnected or connected. The types of the first contactor and the second contactor can be selected as needed, for example, a normally open contactor can be selected. The connection of the first contactor and the second contactor refers to the connection of the main contacts of the first contactor and the second contactor and the connection to the circuit, and the disconnection of the first contactor and the second contactor refers to the disconnection of the main contacts of the first contactor and the second contactor and the disconnection of the first contactor and the second contactor and the disconnection of the main contacts of the first contactor and the second contactor and the disconnection of the circuit.

[0093] In step S140, the second current flowing through the second actuator is detected. As described above, the current flowing through the second actuator can be detected by a current detector such as a transformer or an electric energy meter.

[0094] In step S150 , it is determined whether the first actuator is normal according to the first current.

[0095] In step S160 , it is determined whether the second actuator is normal according to the second current.

[0096] There is no strict restriction on the execution order of the above steps. For example, the detection can also be performed in the order of step S110, step S120, step S150, step S130, step S140 and step S160, or the detection can be performed in the order of step S130, step S140, step S160, S110, step S120 and step S150.

[0097] Specifically, the step S150 of determining whether the first actuator is normal according to the first current may include: determining whether the first actuator is normal according to the first current and a feedback signal of the first contactor.

[0098] The step S160 of determining whether the second actuator is normal according to the second current may include: determining whether the second actuator is normal according to the second current and a feedback signal of the second contactor.

[0099] Specifically, whether the first actuator or the second actuator is normal can be determined based on whether the maximum value of the first current or the second current within a certain time period is within a preset range when the feedback signal has a predetermined level (for example, a high level).

[0100] Specifically, the step of determining whether the first actuator is normal based on the first current and the feedback signal of the first contactor may include: determining whether the first actuator is normal based on the first maximum value of the first current within a first predetermined time period since the first contactor is turned on and the second maximum value of the first current within a second predetermined time period after the first predetermined time period.

[0101] The step of determining whether the second actuator is normal based on the second current and the feedback signal of the second contactor includes: determining whether the second actuator is normal based on the third maximum value of the second current within the first predetermined time period since the second contactor is turned on and the fourth maximum value of the second current within the second predetermined time period after the first predetermined time period.

[0102] In response to the ratio of the first maximum value to the second maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the first contactor having a high level, the first actuator is determined to be normal; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the first predetermined threshold and the feedback signal of the second contactor having a high level, the second actuator is determined to be normal. In response to the ratio of the first maximum value to the second maximum value being less than the first predetermined threshold and the feedback signal of the first contactor having a high level, the first actuator is determined to be abnormal; in response to the ratio of the third maximum value to the fourth maximum value being less than the first predetermined threshold and the feedback signal of the second contactor having a high level, the second actuator is determined to be abnormal. As described above, the first predetermined threshold here can be 2.

[0103] In response to the ratio of the first maximum value to the second maximum value being less than the second predetermined threshold and the feedback signal of the first contactor having a high level, it is determined that the first actuator is blocked; in response to the ratio of the first maximum value to the second maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the first contactor having a high level, it is determined that the first actuator is phase-missing or poorly connected; in response to the ratio of the third maximum value to the fourth maximum value being less than the second predetermined threshold and the feedback signal of the second contactor having a high level, it is determined that the second actuator is blocked; in response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to the second predetermined threshold and less than the first predetermined threshold and the feedback signal of the second contactor having a high level, it is determined that the second actuator is phase-missing or poorly connected, and the first predetermined threshold is greater than the second predetermined threshold, and the second predetermined threshold here can be 1.5.

[0104] The first actuator and the second actuator may be two different actuators of the same type, or two different types of actuators. For example, the first actuator and the second actuator may both be hydraulic pumps, lubricating oil pumps, cooling fans, heaters, cooling pumps, yaw motors, or pitch motors. For another example, the first actuator may be one of the hydraulic pumps, lubricating oil pumps, cooling fans, heaters, cooling pumps, yaw motors, or pitch motors, and the second actuator may be another of the hydraulic pumps, lubricating oil pumps, cooling fans, heaters, cooling pumps, yaw motors, and pitch motors.

[0105] During the inspection, the position of the first actuator can be used exclusively for inspecting the first type of actuator, and the position of the second actuator can be used exclusively for inspecting the second type of actuator. However, this is only an example, and the types of actuators inspected in the same batch are not specifically limited.

[0106] Reference Figure 8 According to the second embodiment of the present disclosure, the automatic detection method of the actuator includes steps S701, S702, S703, S704, S705, S706, S707, S708, S709, S710, S711, S712, S713, S714, S715, S716 and S717.

[0107] In step S701, it is determined whether the detection process of the current actuator is started.

[0108] In step S702, if the detection process of the current actuator is started, select automatic detection in the detection platform interface. If the detection process is not started, the next actuator is detected in step S717.

[0109] In step S703 , it is determined whether the process of actuator 1 (eg, the first actuator) is detected.

[0110] In step S704, if it is determined that the process of the actuator 1 is detected, the actuator can be started by controlling the digital output channel of the controller. Specifically, the first contactor can be controlled to be turned on, so that the actuator is powered by the power supply to start the actuator.

[0111] In step S705, the current value in the total circuit of the line is collected. The current value of the total circuit is the current value flowing through the first actuator.

[0112] In step S706 , it is determined whether the current is not zero during startup and whether a feedback signal from the first contactor is received.

[0113] In step S707 , within a preset time period (eg, a time period from the start time to 300 ms or from the start time to 500 ms), the maximum value A1 of the current is detected and recorded.

[0114] In step S708, it is determined whether a predetermined time (eg, 300 ms to 500 ms) has passed. If the predetermined time has not been reached, the process continues to wait until the time has been reached.

[0115] In step S709, the maximum current A2 after the actuator is started is detected.

[0116] In step S710, it is determined whether A1 / A2 is greater than 4.

[0117] In step S713, in response to A1 / A2 being greater than 4, it is determined that the actuator operates normally and the process detection passes.

[0118] In step S711, it is determined whether A1 / A2 is continuously less than 2.

[0119] In step S714, in response to A1 / A2 being continuously less than 2, it is determined that the actuator is operating abnormally (stuck or missing phase), and the process detection fails. The distinction between stalled and missing phase can be distinguished by further adjusting the threshold. For example, if A1 / A2 is continuously less than 1.5, it can be said that the actuator is stalled. If A1 / A2 is continuously greater than 1.5 and less than 2, it can be said that the actuator is missing phase.

[0120] In step S712, it is determined whether A1 / A2 is less than 2.

[0121] In step S715, in response to A1 / A2 being less than 2, it is determined that the detection line of the actuator is in a virtual connection and the detection process fails. Otherwise (ie, A1 / A2 is greater than or equal to 2), it is determined that the actuator is normal.

[0122] In step S716, in response to the starting current being not zero or the feedback signal of the first contactor not being received, it is determined that the actuator is abnormal or the detection circuit is abnormal.

[0123] In step S717, the next actuator (ie, the second actuator) is detected. The process of the second actuator is the same as the above process and will not be described in detail here.

[0124] It should be understood that the various units or modules in the control device according to the exemplary embodiments of the present disclosure may be implemented as hardware components and / or software components. Those skilled in the art may implement the various units, for example, using a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a software algorithm, etc., according to the processing performed by the various units defined.

[0125] Each operation of the above steps can be written as a software program or instruction. Therefore, the control method according to the exemplary embodiment of the present disclosure can be implemented via software. The computer-readable storage medium of the exemplary embodiment of the present disclosure can store a computer program. When the computer program is executed by the processor, the automatic detection method of the exemplary embodiment as described above is implemented.

[0126] According to various embodiments of the present disclosure, a device (e.g., a module or their functions) or a method may be implemented by a program or instruction stored in a computer-readable storage medium. When the instruction is executed by a processor, the processor may perform a function corresponding to the instruction or perform a method corresponding to the instruction. At least a portion of a module may be implemented (e.g., executed) by a processor. Computer-readable storage media include non-temporary computer-readable storage media, for example, magnetic media such as floppy disks and tapes, optical media (including compact disks (CD) ROMs and DVD ROMs), magneto-optical media such as floppy disks, hardware devices such as ROMs, RAMs designed for storing and executing program commands, and flash memories.

[0127] For example, according to an exemplary embodiment of the present disclosure, a controller may be provided, which may include: a processor (not shown) and a memory (not shown), wherein the memory stores a computer program, and when the computer program is executed by the processor, the automatic detection method as described in the above exemplary embodiment is implemented.

[0128] The automatic detection circuit and the automatic detection method of the embodiments of the present disclosure can detect whether the actuator is normal.

[0129] The automatic detection circuit and automatic detection method of the embodiments of the present disclosure can realize the automatic detection of the main actuators 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.

[0130] The automatic detection circuit of the embodiment of the present disclosure is easy to install and / or does not require system modification, which can reduce the complexity of the factory inspection operation of the unit. After the equipment including the above-mentioned automatic detection circuit is configured, there is no need to repeatedly change the line.

[0131] The automatic detection circuit and automatic detection method of the embodiments of the present disclosure are simple, reliable, and easy to implement, and do not require the setting of fixed detection parameters. The detection process changes automatically with the change of the device type, and can be applied to a variety of different types of devices to ensure the normal execution of the detection process. The detection process does not require a complex model, and can effectively prevent interference and false detection caused by signal fluctuations.

[0132] The automatic detection circuit and automatic detection method of the embodiments of the present disclosure can effectively detect whether the actuator is operating, whether the operation is abnormal, and whether the line is abnormal. At the same time, it can avoid process jams caused by inappropriate parameters and ensure the smooth progress of factory inspection.

[0133] Although some exemplary embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents; for example, the technical features of different embodiments may be combined.

Claims

1. An automatic detection circuit for an actuator, It is characterized in that include: A first contactor, electrically connected between a first actuator to be detected and a power source; a second contactor, electrically connected between the second actuator to be detected and the power supply; a current detector electrically connected to a common power supply path of the power supply to the first actuator and the second actuator to detect a first current flowing through the first actuator when only the first contactor of the first contactor and the second contactor is turned on, or a second current flowing through the second actuator when only the second contactor of the first contactor and the second contactor is turned on; The controller is configured to first control the first contactor to be turned on and the second contactor to be turned off to determine whether the first actuator is normal according to the first current; and then control the first contactor to be turned off and the second contactor to be turned on to determine whether the second actuator is normal according to the second current.

2. The automatic detection circuit of the actuator according to claim 1, It is characterized in that The controller is further configured to: determining whether the first actuator is normal according to the first current and a feedback signal of the first contactor, and Whether the second actuator is normal is determined according to the second current and a feedback signal of the second contactor.

3. The automatic detection circuit of the actuator according to claim 2, It is characterized in that The controller is further configured to: determining whether the first actuator is normal according to a first maximum value of the first current within a first predetermined time period since the first contactor is turned on and a second maximum value of the first current within a second predetermined time period after the first predetermined time period; Whether the second actuator is normal is determined based on a third maximum value of the second current within a first predetermined time period since the second contactor is turned on and a fourth maximum value of the second current within a second predetermined time period after the first predetermined time period.

4. The automatic detection circuit of the actuator according to claim 3, It is characterized in that The controller is further configured to: In response to a ratio of the first maximum value to the second maximum value being greater than or equal to a first predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is normal; In response to a ratio of the third maximum value to the fourth maximum value being greater than or equal to a first predetermined threshold and a feedback signal of the second contactor having a high level, determining that the second actuator is normal; In response to a ratio of the first maximum value to the second maximum value being less than a first predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is abnormal; In response to a ratio of the third maximum value to the fourth maximum value being less than a first predetermined threshold and a feedback signal of the second contactor having a high level, it is determined that the second actuator is abnormal.

5. The automatic detection circuit of the actuator according to claim 4, It is characterized in that The controller is further configured to: In response to a ratio of the first maximum value to the second maximum value being less than a second predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is blocked; In response to the ratio of the first maximum value to the second maximum value being greater than or equal to a second predetermined threshold value and less than the first predetermined threshold value and the feedback signal of the first contactor having a high level, determining that the first actuator is phase-missing or virtually connected; In response to a ratio of the third maximum value to the fourth maximum value being less than a second predetermined threshold and a feedback signal of the second contactor having a high level, determining that the second actuator is blocked; In response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to a second predetermined threshold value and less than the first predetermined threshold value and the feedback signal of the second contactor having a high level, it is determined that the second actuator is phase-missing or virtually connected, The first predetermined threshold is greater than the second predetermined threshold.

6. The automatic detection circuit of the actuator according to claim 2, It is characterized in that The controller is further configured to: In response to the feedback signal of the first contactor having a low level, determining that a detection circuit of the first actuator is abnormal; In response to the feedback signal of the second contactor having a low level, it is determined that a detection circuit of the second actuator is abnormal.

7. The automatic detection circuit of the actuator according to claim 1, It is characterized in that The current detector is a transformer or an electric energy meter. The transformer is electrically connected to the controller, and the electric energy meter is communicatively connected to the controller.

8. The automatic detection circuit of the actuator according to any one of claims 1 to 7, It is characterized in that Each of the first actuator and the second actuator is a hydraulic pump, a lubricating oil pump, a cooling fan, a heater, a cooling pump, a yaw motor or a pitch motor.

9. The automatic detection circuit of the actuator according to any one of claims 1 to 7, It is characterized in that The controller is a programmable logic controller, the current detector is electrically connected to an analog input channel of the programmable logic controller, or the current detector is communicatively connected to a central processing unit of the programmable logic controller, the first digital output channel of the programmable logic controller is electrically connected to the coil of the first contactor, and the second digital channel of the programmable logic controller is electrically connected to the coil of the second contactor.

10. An automatic detection method for an actuator, It is characterized in that include: Controlling a first contactor to be turned on and controlling a second contactor to be turned off, wherein the first contactor is electrically connected between a first actuator to be detected and a power source, and the second contactor is electrically connected between a second actuator to be detected and the power source; detecting a first current flowing through the first actuator; Controlling the first contactor to be disconnected and controlling the second contactor to be connected; detecting a second current flowing through the second actuator; determining whether the first actuator is normal according to the first current; as well as Whether the second actuator is normal is determined according to the second current.

11. The automatic detection method of the actuator according to claim 10, It is characterized in that The step of determining whether the first actuator is normal according to the first current comprises: determining whether the first actuator is normal according to the first current and a feedback signal of the first contactor; The step of determining whether the second actuator is normal according to the second current comprises: Whether the second actuator is normal is determined according to the second current and a feedback signal of the second contactor.

12. The automatic detection method of the actuator according to claim 11, It is characterized in that The step of determining whether the first actuator is normal according to the first current and the feedback signal of the first contactor comprises: determining whether the first actuator is normal according to a first maximum value of the first current within a first predetermined time period since the first contactor is turned on and a second maximum value of the first current within a second predetermined time period after the first predetermined time period; The step of determining whether the second actuator is normal based on the second current and the feedback signal of the second contactor includes: determining whether the second actuator is normal based on the third maximum value of the second current within the first predetermined time period since the second contactor is turned on and the fourth maximum value of the second current within the second predetermined time period after the first predetermined time period.

13. The automatic detection method of the actuator according to claim 12, It is characterized in that In response to a ratio of the first maximum value to the second maximum value being greater than or equal to a first predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is normal; In response to a ratio of the third maximum value to the fourth maximum value being greater than or equal to a first predetermined threshold and a feedback signal of the second contactor having a high level, determining that the second actuator is normal; In response to a ratio of the first maximum value to the second maximum value being less than a first predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is abnormal; In response to a ratio of the third maximum value to the fourth maximum value being less than a first predetermined threshold and a feedback signal of the second contactor having a high level, it is determined that the second actuator is abnormal.

14. The automatic detection method of the actuator according to claim 13, It is characterized in that In response to a ratio of the first maximum value to the second maximum value being less than a second predetermined threshold and a feedback signal of the first contactor having a high level, determining that the first actuator is blocked; In response to the ratio of the first maximum value to the second maximum value being greater than or equal to a second predetermined threshold value and less than the first predetermined threshold value and the feedback signal of the first contactor having a high level, determining that the first actuator is phase-missing or virtually connected; In response to a ratio of the third maximum value to the fourth maximum value being less than a second predetermined threshold and a feedback signal of the second contactor having a high level, determining that the second actuator is blocked; In response to the ratio of the third maximum value to the fourth maximum value being greater than or equal to a second predetermined threshold value and less than the first predetermined threshold value and the feedback signal of the second contactor having a high level, it is determined that the second actuator is phase-missing or virtually connected, The first predetermined threshold is greater than the second predetermined threshold.

15. The automatic detection method of the actuator according to claim 10, It is characterized in that Each of the first actuator and the second actuator is an actuator including a motor.

16. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the automatic detection method according to any one of claims 10 to 15 is implemented.

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