Method and device for identifying integrity of vibration signals of wind turbine online monitoring system

Abstract

The application discloses a kind of wind turbine online monitoring system vibration signal integrity identification method and device, belong to wind turbine online monitoring technical field, the vibration signal of wind turbine is carried out abnormal identification from three aspects whether test system fails, whether test system exists electromagnetic interference and whether test system installation is firm, can identify the abnormal problem of vibration data in online monitoring system, and timely remind the failure or false alarm problem existing in system of operation and maintenance personnel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind turbine online monitoring, and particularly relates to a wind turbine online monitoring system vibration signal integrity identification method and device. BACKGROUND

[0002] At present, most wind turbines are equipped with online data monitoring systems (CMS systems), and vibration signal data is mainly used in the CMS system. During long-term use, problems such as loosening of the installation surface of the vibration sensor probe, loosening of the signal cable, poor contact of the connecting cable and the interface of the acquisition device or the sensor, changes in the surrounding electromagnetic environment, and failure of the system electromagnetic shielding function may occur. These problems will cause distortion of the vibration signal and abnormal test results, resulting in failure to monitor the vibration problem of the unit or false alarms due to no vibration problem. These may cause hidden dangers and unnecessary resource waste in the operation and maintenance of the unit. SUMMARY

[0003] The present application provides a wind turbine online monitoring system vibration signal integrity identification method and device, and provides a data pre-cleaning method. Through this method, abnormal problems of vibration data in the online monitoring system can be identified, and the failure or false alarm problems existing in the system can be timely reminded to the operation and maintenance personnel.

[0004] To achieve the above purpose, the present application adopts the following technical solutions:

[0005] A wind turbine online monitoring system vibration signal integrity identification method, comprising:

[0006] determining whether the vibration signal is abnormal according to the effective value of the vibration signal;

[0007] determining whether the vibration signal is abnormal according to the amplitude of the characteristic frequency of the vibration signal;

[0008] determining whether the vibration signal is abnormal according to the effective value change rate and the amplitude change rate of the vibration signal.

[0009] Further, the effective value of the vibration signal is used to identify whether the test system is failed, comprising the following steps:

[0010] not judging the signal in the shutdown state;

[0011] calculating the effective value of the vibration signal when the unit is running, and determining whether the effective value of the vibration signal is greater than an energy threshold value:

[0012] if the effective value of the vibration signal is greater than the energy threshold value, the result of the judgment is that the signal is normal; otherwise, the result of the judgment is that the signal is abnormal.

[0013] Further, the energy threshold value is 0.03g, g is the acceleration of gravity.

[0014] Further, the method for judging the electromagnetic interference of the test system according to the amplitude of the characteristic frequency of the vibration signal comprises the following steps:

[0015] The frequency spectrum of the vibration signal is calculated, the amplitudes fi (i = 1, 2, 3, 4...) of the power frequency and its multiple frequencies of the vibration signal are extracted, a threshold value b is set, if the maximum value in the amplitude fi is greater than the threshold value b and greater than 0.1 times the maximum value of the signal frequency domain data, it is considered that the signal has the power frequency signal, otherwise, it is considered that the signal is normal;

[0016] Since there may be actual vibration excitation of the power frequency in the actual signal, in order to prevent misjudgment, the power frequency interference conditions of multiple adjacent vibration measuring points are compared, if all the vibration signals have the power frequency signal, it is judged that it is the actual vibration response and no prewarning is performed, if one or more vibration signals have no power frequency signal, it is judged that the measuring point with the power frequency signal has the power frequency interference.

[0017] Further, the threshold value b is 0.02g, g is the acceleration of gravity.

[0018] Further, the method for judging whether the vibration signal has the interference signal according to the effective value and the amplitude change rate of the vibration signal comprises the following steps:

[0019] The vibration signal in a specified time range is segmented, the effective value of each segment of the vibration signal is calculated, and then the change rates of the effective values of the vibration signals are compared; meanwhile, the vibration signal is subjected to differential calculation to obtain the change rate of the amplitudes of the continuous sampling points;

[0020] The size relationship between the change rate of the amplitude of the vibration signal and a threshold value c and the size relationship between the change rate of the effective value of the vibration signal and a threshold value d are judged:

[0021] If the change rate of the amplitude of the vibration signal is greater than the threshold value c and the change rate of the effective value of the vibration signal is not in the set threshold value interval, the vibration signal is abnormal; otherwise, the vibration signal is normal.

[0022] Further, the threshold value c is 3.5, and the threshold value interval is [0.5, 1.5].

[0023] A kind of wind turbine online monitoring system vibration signal integrity identification device, comprising:

[0024] The first identification module is used to judge whether the vibration signal is abnormal according to the unit operation state and the effective value of the vibration signal, and the judgment result is sent to the identification result output module;

[0025] The second identification module is used to judge whether the vibration signal is abnormal according to the amplitude of the power frequency and its multiple frequencies, and the judgment result is sent to the identification result output module;

[0026] A third identification module is configured to determine whether the vibration signal is abnormal according to the effective value change rate and the amplitude change rate of each vibration signal, and send the determination result to the identification result output module.

[0027] The identification result output module is configured to output the identification result.

[0028] An electronic device comprises a memory and a processor electrically connected, and the memory stores a computer program capable of running on the processor, and the processor implements the steps of the identification method of the wind turbine online monitoring system vibration signal integrity when executing the computer program.

[0029] A computer readable storage medium stores a computer program, and the computer program implements the steps of the identification method of the wind turbine online monitoring system vibration signal integrity when executed by a processor.

[0030] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0031] The present application judges the vibration signal based on the effective value, the effective value change rate, the amplitude of the characteristic frequency and the amplitude change rate, respectively determines whether the vibration signal is abnormal from multiple aspects, whether the test system is invalid, whether the test system has electromagnetic interference and whether the test system is installed firmly, performs abnormal identification on the vibration signal of the wind turbine, can follow the online system, judges the vibration signal quality in real time, can identify the signal abnormality reason, prompts the troubleshooting direction, can help the operation and maintenance personnel to quickly troubleshoot and solve the problem, can also warn the system problem, avoids system false alarm or omission, improves the reliability of operation and maintenance work, and reduces the operation and maintenance workload. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The identification method flowchart is provided for the embodiments of the present application.

[0033] Figure 2 The schematic diagram of the wind turbine test system is provided.

[0034] Figure 3 The identification device schematic diagram is provided for the embodiments of the present application.

[0035] Figure 4 The structural schematic diagram of an electronic device provided by the embodiments of the present application is provided. DETAILED DESCRIPTION

[0036] In order to make the purpose and technical scheme of the present application clearer and more convenient to understand, the present application is further described in detail below in combination with the drawings and embodiments, and the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0037] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In the description of the present application, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] According to the vibration data characteristics, three possible cases of vibration signal anomaly are listed:

[0039] Case one: test system failure, at this time the vibration signal does not respond to the unit vibration, and the vibration value is at an abnormally low level;

[0040] Case two: there is electromagnetic interference in the test system, at this time the amplitude of the power frequency and its multiple frequency signals in the vibration signal is obvious;

[0041] Case three: the vibration sensor probe is loose, the cable is not fixed firmly, the interface contact is poor, etc., at this time the vibration signal has occasional or frequent mutations; for frequent signal mutation, the vibration value is greater than the actual unit vibration, for occasional signal mutation, the vibration value is basically the same as the actual unit vibration value, but when the acceleration to speed integral operation (or speed to acceleration difference operation) is carried out, the speed value (or acceleration value) after operation will be distorted seriously.

[0042] Reference Figure 1 A vibration signal integrity identification method of an online monitoring system of a wind turbine, which identifies the signal from the following three aspects:

[0043] 1) According to the effective value of the vibration signal, identify whether the test system is failed.

[0044] Considering that the vibration energy is related to the operating state of the unit, the operating state of the unit needs to be associated. For example, do not judge the signal in the shutdown state; when the unit is running, set an energy threshold a, if the effective value of the test vibration signal is greater than the energy threshold a, the judgment result is that the signal is normal; if the effective value of the test vibration signal is less than or equal to the energy threshold a, the judgment result is that the signal is abnormal and a warning is given to prompt the operation and maintenance personnel to check the monitoring system.

[0045] Wherein, the energy threshold a is 0.03g, and g is the acceleration of gravity. According to a large amount of actual measurement data on site, when the unit is running, its vibration energy is greater than 0.03g, and once the vibration energy is less than 0.03g, it means that the signal acquisition system is abnormal.

[0046] 2) Judge that the test system has electromagnetic interference

[0047] Calculate the frequency spectrum of the vibration signal, and extract the amplitude fi(i=1, 2, 3, 4...) of the power frequency and its multiple frequency of the vibration signal. Set a threshold value b, if the maximum value in the amplitude fi is greater than the threshold value b, and greater than 0.1 times the maximum value of the signal frequency domain data, it is considered that the signal has power frequency signal, otherwise it is considered that the signal is normal.

[0048] Explanation: including power frequency, i=1 is power frequency, i=2, 3 is 2 times and 3 times of power frequency. The maximum value of the frequency domain data is the maximum value of the vibration in the frequency domain, because the power frequency interference always exists, when the power frequency interference reaches a certain degree, it is considered that the signal has a problem. Therefore, a value needs to be set to judge whether the power frequency interference affects the use of the signal, and the value is set to 0.1 times the maximum value.

[0049] Because there may be actual vibration excitation of power frequency in the actual signal, in order to prevent misjudgment, the power frequency interference of multiple adjacent vibration measuring points is compared, if all of them have power frequency signal, it is judged as actual vibration response, and no warning is given, if one or more vibration signals have no power frequency signal, it is judged that the measuring point with power frequency signal has power frequency interference. Among them, adjacent vibration measuring points are defined as vibration measuring points on the same component, and the component refers to the generator, gear box, main shaft, etc.

[0050] Wherein, the threshold value b is 0.02g.

[0051] 3) Judge that the sensor probe is loose, the cable is not fixed firmly, the interface contact is poor, etc.

[0052] After the vibration signal mutates, the vibration signal baseline will be raised or lowered. The vibration signal collected in a specified time range can be segmented. The segmentation can be performed according to data length or time. For example, the vibration signal is segmented according to time, 1 second of data is taken as a segment, the effective value of the vibration signal of each segment is calculated, and then the difference between the effective values of the vibration signals of each segment is compared to determine whether the vibration signal baseline is raised or lowered. At the same time, the entire vibration signal is subjected to difference calculation to obtain the change rate of the amplitude of the continuous sampling points.

[0053] The vibration signal effective value change rate and the amplitude change rate are used to determine whether the signal is abnormal by judging whether the signal has a baseline change and instantaneous distortion.

[0054] The vibration signal amplitude change rate is calculated as follows:

[0055] ti = abs(T k+1 -T k ); va = max(ti) / mean(ti),

[0056] wherein T k represents the vibration amplitude of the kth point, T k+1 represents the vibration amplitude of the k+1th point, abs represents the absolute value, ti is the set of differences, max represents the maximum value, mean represents the average value, and va represents the amplitude change rate. The threshold value c is set to 3.5.

[0057] The effective value change rate is calculated as follows:

[0058] For example, the data collected by the CMS system is 10 seconds of data. The 10 seconds of data is segmented into 10 segments of data at 1 second per segment, the effective values S i of the 10 segments of data are calculated, and the effective value change rate of each segment of data is calculated according to the following formula:

[0059] h ki = S i / S1,

[0060] h ki is the change rate of the effective value of the ith segment of data compared to the effective value of the first segment of data, and S1 is the effective value of the first segment of data.

[0061] Specifically, the relationship between the vibration signal amplitude change rate and the threshold value c, and the relationship between the vibration signal effective value and the threshold value d are determined as follows:

[0062] If the vibration signal amplitude change rate is greater than the threshold value c, and the value of the vibration signal effective value change rate h ki is less than 0.5 or greater than 1.5, the vibration signal is abnormal; otherwise, the vibration signal is normal.

[0063] That is, the threshold interval is set as a lower limit of 0.5 and an upper limit of 1.5.

[0064] It should be noted that the vibration signal integrity identification method of the embodiment of the present application can be executed by the vibration signal integrity identification system provided by the embodiment of the present application. The vibration signal integrity identification system can be an electronic device, or can be configured in an electronic device to realize the function of identifying the integrity of the vibration signal.

[0065] The electronic device can be any stationary or mobile computing device capable of data processing, such as a notebook computer, a smart phone, a wearable device, or a stationary computing device such as a desktop computer, a server, or other types of computing devices, without limitation.

[0066] Referring to Figure 2 The present application provides a vibration signal integrity identification system, which comprises a data acquisition device 3, the data acquisition device 3 is connected with a plurality of vibration sensors 1 through signal cables, and the data acquisition device 3 is integrated with a vibration signal integrity identification device.

[0067] The vibration sensor 1 is used to collect wind turbine vibration signals.

[0068] The data acquisition device 3 is used to receive wind turbine vibration signals and analyze whether the wind turbine vibration signals are abnormal.

[0069] Referring to Figure 3 The identification device comprises a first identification module, a second identification module, a third identification module, and an identification result output module.

[0070] The first identification module is used to determine whether the vibration signal is abnormal according to the unit operation state and the vibration signal effective value, and send the determination result to the identification result output module.

[0071] The second identification module is used to determine whether the vibration signal is abnormal according to the amplitude of the power frequency and its multiple frequencies, and send the determination result to the identification result output module.

[0072] The third identification module is used to determine whether the vibration signal is abnormal according to the vibration energy difference of each vibration signal and the amplitude change rate of the continuous sampling points of the vibration signal, and send the determination result to the identification result output module.

[0073] The identification result output module is used to output the identification result.

[0074] Referring to Figure 4As shown, the present application provides an electronic device, comprising: a processor, a memory and a bus, the memory is used to store computer execution instructions, the processor is connected with the memory through the bus; when the electronic device is running, the processor executes the computer execution instructions stored in the memory, so that the processor runs the program corresponding to the computer execution instructions by reading the computer execution instructions stored in the memory, for executing the vibration signal integrity identification method proposed in any of the above embodiments of the present application. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 4 In the description of the present application, only one line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0075] In order to realize the above-mentioned embodiments, the present application further provides a computer readable storage medium having computer instructions stored therein, wherein the computer instructions are used to make the computer execute the vibration signal integrity identification method proposed in any of the above embodiments of the present application.

[0076] In order to realize the above-mentioned embodiments, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, realizes the vibration signal integrity identification method proposed in any of the above embodiments of the present application.

[0077] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0078] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0079] Any process or method described in flowcharts or otherwise described herein can be understood as representing a module, segment, or portion of code that includes one or more executable instructions for implementing the specified logical function(s) or process(es), and the various embodiments of the application can include additional implementation details that will be apparent to those skilled in the art, including that the order of execution of the processes can be changed, including that the functions can be executed in substantially simultaneous fashion, or in reverse order, depending on the functionality involved.

[0080] Logic and / or steps represented in flowcharts or otherwise described herein, for example, can be considered as a list of executable instructions for implementing the logic function, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a product of the manufacturing and / or processing, and can be a machine-readable storage medium (alternatively, the medium can be a machine-readable signal medium). The computer-readable medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection having one or more wires (electronic), a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber (optical), and a portable compact disc read-only memory (CDROM). Note that the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via the optical scanner of a device or device or via an intermediary, such as a facility bureau, then electronically captured, for example, via an OCR device or facility, and then processed, for example, by an electronic device or facility, to convert the program into a machine-readable format.

[0081] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. As such, in hardware implementations, any of the following technologies, or combinations thereof, can be used: a discrete logic circuit(s) having logic gates for implementing logic functions on data signals, an application specific integrated circuit having appropriate combinational logic gates, a programmable gate array(s) (PGA), a field programmable gate array (FPGA), etc., as is known in the art.

[0082] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0083] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0084] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A method for identifying the integrity of vibration signals of an online monitoring system of a wind turbine, characterized in that, The method comprises the following steps: determining whether the vibration signal is abnormal according to the effective value of the vibration signal; determining whether the vibration signal is abnormal according to the amplitude of the characteristic frequency of the vibration signal; determining whether the vibration signal is abnormal according to the effective value change rate and the amplitude change rate of the vibration signal; the step of determining whether the vibration signal is abnormal according to the amplitude of the characteristic frequency of the vibration signal comprises the following steps: calculating the frequency spectrum of the vibration signal, extracting the amplitude fi (i = 1, 2, 3, 4...) of the power frequency and its multiple frequencies of the vibration signal, and setting a threshold value b; if the maximum value in the amplitude fi is greater than the threshold value b and greater than 0.1 times the maximum value of the signal frequency domain data, it is considered that the signal exists the power frequency signal, otherwise, it is considered that the signal is normal; since there may be actual vibration excitation of the power frequency in the actual signal, in order to prevent misjudgment, the power frequency interference conditions of multiple adjacent vibration measuring points are compared; if all the power frequency signals exist, it is judged that it is the actual vibration response and no early warning is performed; if one or more vibration signals do not have the power frequency signal, it is judged that the measuring point with the power frequency signal exists the power frequency interference.

2. The method according to claim 1, wherein, the step of determining whether the vibration signal is abnormal according to the effective value of the vibration signal comprises the following steps: not judging the signal in the shutdown state; when the unit is running, calculating the effective value of the vibration signal, and judging whether the effective value of the vibration signal is greater than an energy threshold value: if the effective value of the vibration signal is greater than the energy threshold value, the judgment result is that the signal is normal; otherwise, the judgment result is that the signal is abnormal.

3. The method according to claim 2, wherein the method further comprises: The energy threshold value is 0.03g, and g is the gravitational acceleration.

4. The method of claim 1, wherein the method further comprises: The threshold value b is 0.02g, and g is the gravitational acceleration.

5. The method of claim 1, wherein the method further comprises: the step of determining whether the vibration signal is abnormal according to the effective value change rate and the amplitude change rate of the vibration signal comprises the following steps: segmenting the vibration signal in a specified time range, calculating the effective value of each segment of the vibration signal, and then comparing the effective value change rates of the vibration signals; at the same time, the vibration signal is subjected to differential calculation to obtain the change rate of the amplitude of the continuous sampling points; judging the size relationship between the change rate of the amplitude of the vibration signal and a threshold value c, and the size relationship between the effective value change rate of the vibration signal and a threshold value d: if the change rate of the amplitude of the vibration signal is greater than the threshold value c, and the effective value change rate of the vibration signal is not in the set threshold value interval, the vibration signal is abnormal; otherwise, the vibration signal is normal.

6. The method according to claim 5, wherein the method further comprises: The threshold value c is 3.5, and the threshold value interval is [0.5, 1.5].

7. A device for identifying the integrity of vibration signals of an online monitoring system of a wind turbine, for implementing the method according to claim 1, characterized in that The method comprises the following steps: a first identification module is used for determining whether the vibration signal is abnormal according to the unit running state and the effective value of the vibration signal, and sending the judgment result to an identification result output module; a second identification module is used for determining whether the vibration signal is abnormal according to the amplitude of the power frequency and its multiple frequencies, and sending the judgment result to the identification result output module; a third identification module is used for determining whether the vibration signal is abnormal according to the effective value change rate and the amplitude change rate of each segment of the vibration signal, and sending the judgment result to the identification result output module; the identification result output module is used for outputting the identification result.

8. An electronic device, comprising: The method comprises the following steps: a memory and a processor are electrically connected, the memory stores a computer program capable of running on the processor, and the processor executes the computer program to realize the steps of the method in any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 8. The computer program, which is executed by a processor, implements the steps of the method according to any one of claims 1 to 6.

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