CN110792564B - Method and device for detecting and positioning down lead fault of fan blade - Google Patents
Method and device for detecting and positioning down lead fault of fan blade Download PDFInfo
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- CN110792564B CN110792564B CN201911077419.6A CN201911077419A CN110792564B CN 110792564 B CN110792564 B CN 110792564B CN 201911077419 A CN201911077419 A CN 201911077419A CN 110792564 B CN110792564 B CN 110792564B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The embodiment of the invention discloses a method and a device for detecting and positioning faults of a down lead of a fan blade, wherein the method comprises the following steps: acquiring the transmission waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected; carrying out correlation processing on the two propagation waveforms to obtain waveforms after correlation processing; dividing the waveform after relevant processing into fault judgment sections according to the position of the branch point of the down lead of the fan blade; determining fault reflection waves which can meet preset conditions in a fault judging section; and determining the position of the branch point of the blade down conductor with the fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse. Carrying out relevant processing on the propagation waveforms, and reversely pushing the fault condition of the branch point of the down lead of the fan blade according to the waveform difference; determining the position of a branch point of a down lead of a fan blade with a fault in a fault judging section according to the fault reflected wave and the nanosecond incident pulse; the fault detection and positioning of the down lead of the fan blade are realized.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method and a device for detecting and positioning faults of a down lead of a fan blade.
Background
With the continuous development of wind power generation, the capacity of a single machine is continuously improved, the size of the whole machine is continuously increased, and blades are always positioned at higher positions in the operation process, so that the condition of lightning stroke is more obvious.
At present, a method for measuring the resistance of a lightning protection channel is mostly adopted for fault detection of a blade down lead of a wind power plant, the method is complex to operate, consumes manpower and material resources, is low in efficiency, and cannot realize fault location. In addition, foreign scholars propose to detect the fracture position of the blade down conductor by adopting a half-wave dipole antenna theory and an electrostatic capacitance method, but neglect the branch of the down conductor, the problem that the branch fracture cannot be detected exists, and the method still has great difficulty in practical application; in addition, another method for determining the disconnection position of the blade down conductor by using an X-ray instrument is proposed by the scholars, but the method is high in cost and is not beneficial to wide implementation.
Therefore, how to detect and position the down lead fault of the fan blade becomes an urgent problem to be solved.
Disclosure of Invention
Because the existing method has the problems, the embodiment of the invention provides a method and a device for detecting and positioning the fault of a down lead of a fan blade.
In a first aspect, an embodiment of the present invention provides a method for detecting and locating a fault of a down conductor of a fan blade, including: acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected respectively; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;
performing correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing;
dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the down lead of the fan blade;
determining fault reflection waves which can meet preset conditions in the fault judging section;
and determining the position of the branch point of the fan blade down lead with the fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse.
Optionally, the correlating the first propagated waveform with the second propagated waveform to obtain a correlated waveform includes:
performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;
performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;
and performing smooth fitting on the waveform subjected to the difference processing to obtain the waveform subjected to the correlation processing.
Optionally, the dividing the waveform after the related processing into fault determination sections according to the position of the branch point of the fan blade down conductor includes:
and dividing the waveform after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor.
Optionally, the preset condition includes: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
Optionally, the determining, according to the fault reflected wave and the nanosecond incident pulse, a position of a branch point of a down conductor of a fan blade that has a fault in the fault determination section includes: according to the formula
Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.
In a second aspect, an embodiment of the present invention further provides a device for detecting and locating a fault of a down conductor of a blade, including: the device comprises an acquisition module, a related processing module, a dividing module, a first determining module and a second determining module;
the acquisition module is used for respectively acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;
the correlation processing module is configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after the correlation processing;
the dividing module is used for dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the fan blade down lead;
the first determining module is configured to determine a fault reflected wave that can meet a preset condition in the fault determination section;
and the second determining module is used for determining the position of the branch point of the blade down conductor with the fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse.
Optionally, the relevant processing module is specifically configured to:
performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;
performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;
and performing smooth fitting on the waveform subjected to the difference processing to obtain the waveform subjected to the correlation processing.
Optionally, the dividing module is specifically configured to: and dividing the waveform after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor.
Optionally, the preset condition includes: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
Optionally, the second determining module is specifically configured to: according to the formula
Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, which when called by the processor are capable of performing the above-described methods.
In a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium storing a computer program, which causes the computer to execute the above method.
According to the technical scheme, the first propagation waveform and the second propagation waveform are subjected to correlation processing, and the fault condition of the branch point of the down lead of the fan blade is reversely deduced according to the waveform difference; determining the position of a branch point of a down lead of a fan blade with a fault in a fault judging section according to the fault reflected wave and the nanosecond incident pulse; the fault detection and positioning of the down lead of the fan blade are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for detecting and locating a fault of a down conductor of a fan blade according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of acquiring a propagation waveform according to an embodiment of the present invention;
FIG. 3 is a schematic view of a fan blade facing the wind and a fan blade facing the wind upwards according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for detecting and locating a fault of a down conductor of a fan blade according to an embodiment of the present invention;
fig. 5 is a logic block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a schematic flow chart of a method for detecting and locating a fault of a down conductor of a fan blade provided in this embodiment, and includes:
s11, acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected respectively; acquiring a propagation waveform of the nanosecond incident pulse in the fault-free blade down conductor, wherein the acquired propagation waveform of the nanosecond incident pulse in the fault-free blade down conductor is a first propagation waveform; and the acquired propagation waveform of the nanosecond incident pulse in the downlead of the fan blade to be detected is a second propagation waveform.
The nanosecond incident pulse is a pulse injected to the down conductor of the fan blade at the root of the fan blade by using a nanosecond incident pulse generating device, as shown in fig. 2. The fan blade root is the leftmost end of the fan blade as shown in figure 3 (a). The non-fault fan blade down conductor is a non-fault fan blade down conductor. The down conductor of the fan blade to be detected is shown in figure 2. The propagation waveform is a waveform obtained by the root of the fan blade by using a waveform acquisition device. The first propagation waveform is a propagation waveform of the acquired nanosecond incident pulse in a faultless fan blade down conductor. And the second propagation waveform is the obtained propagation waveform of the nanosecond incident pulse in the down lead of the fan blade to be detected.
It should be noted that the operation of acquiring the propagation waveform of the nanosecond incident pulse in the fault-free fan blade down conductor only needs to be performed once when the present invention is applied for the first time. And storing the acquired propagation waveform of the nanosecond incident pulse in the fault-free blade down conductor, and directly using the stored propagation waveform of the nanosecond incident pulse in the fault-free blade down conductor when a fan blade down conductor fault detection and positioning method is implemented for the second time and later.
It should be noted here that "first" and "second" of the first and second propagated waveforms are used to distinguish two different propagated waveforms, and do not represent a sequential relationship.
And S12, carrying out correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing.
Wherein the correlation process includes, but is not limited to, performing a difference process. The differencing process subtracts the second propagated waveform from the first propagated waveform.
And S13, dividing the waveform after the relevant processing into fault judging sections according to the position of the branching point of the fan blade down lead.
Wherein the fan blade down conductor branch point is shown in fig. 3 (b). And the fault judging section is obtained by dividing the waveform after the relevant processing according to the position of the fan blade leading-down branch point.
And S14, determining fault reflection waves capable of meeting preset conditions in the fault judgment section.
Wherein the fault reflection wave is a waveform extracted from the waveform after the correlation processing in the fault determination section. The preset conditions are that the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
And S15, determining the position of the branch point of the fan blade down conductor with the fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse.
And the fan blade down lead branch point with the fault is a fan blade down lead branch point corresponding to a fault reflected wave which can meet preset conditions in the fault judging section.
According to the embodiment of the invention, the first transmission waveform and the second transmission waveform are subjected to correlation processing, and then the fault condition of the branch point of the down lead of the fan blade is reversely deduced according to the waveform difference; determining the position of a branch point of a down lead of a fan blade with a fault in a fault judging section according to the fault reflected wave and the nanosecond incident pulse; the invention realizes the fault detection and positioning of the down lead of the fan blade.
Further, on the basis of the above method embodiment, the correlating the first propagated waveform with the second propagated waveform to obtain a correlated waveform includes: performing wavelet denoising processing on the first propagation waveform and the second propagation waveform; performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing; and performing smooth fitting on the waveform subjected to the difference processing to obtain the waveform subjected to the correlation processing.
Because the actually acquired propagation waveform contains a large amount of noise interference, before the difference is made between the first propagation waveform and the second propagation waveform, wavelet denoising processing is firstly carried out on the first propagation waveform and the second propagation waveform by using a wavelet analysis method, so that the noise interference is filtered. And then performing difference processing on the first propagation waveform subjected to wavelet de-noising and the second propagation waveform subjected to wavelet de-noising, namely subtracting the second propagation waveform subjected to wavelet de-noising from the first propagation waveform subjected to wavelet de-noising to obtain a waveform subjected to difference processing. In order to facilitate searching for the fault reflected wave and calculating the transmission time difference between the fault reflected wave and the nanosecond incident pulse, in the embodiment of the present invention, the waveform subjected to the difference processing is smoothly fitted to obtain the waveform subjected to the correlation processing, so that the peak of the fault reflected wave in step S14 is more obvious.
According to the embodiment of the invention, a large amount of noise is filtered by performing wavelet denoising processing on the first propagation waveform and the second propagation waveform. The search for the fault reflected wave and the calculation of the difference in transit time between the fault reflected wave and the nanosecond incident pulse are facilitated by smoothly fitting the waveform subjected to the difference processing, and the peak of the fault reflected wave in step S14 can be made more conspicuous.
Further, on the basis of the above method embodiment, the dividing the waveform after the correlation processing into fault determination sections according to the position of the branch point of the fan blade down conductor includes: and dividing the waveform after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor.
Wherein each branching point of the down conductor of the fan blade has its own position. Dividing the waveforms after the relevant processing aiming at each branch point of the fan blade down conductor to obtain a fault judging section corresponding to the position of each branch point of the fan blade down conductor, namely, containing each branch point of the fan blade down conductor in the corresponding fault judging section. It should be noted that the number of fault determination sections obtained by dividing the waveforms after the related processing according to the above method is the same as the number of fan blade down conductor branch points, and each fault determination section has only one fan blade down conductor branch point. And only the existence of fault reflection waves is judged in the fault judging section, the waveforms outside the fault judging section are subjected to zero setting processing, and the waveforms outside the fault judging section are not required to be judged.
According to the embodiment of the invention, by dividing the fault judging section, the adverse effect of useless wave crests outside the fault judging section on searching fault reflected wave crests is reduced, and the accuracy of fault detection and positioning is improved.
Further, on the basis of the above method embodiment, the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
And the duration of the rising edge is a time interval corresponding to a wave band of the waveform in the rising state after the correlation processing. And the duration of the falling edge is a time interval corresponding to a wave band of the waveform in a falling state after the relevant processing. The first preset time and the second preset time are both manually set time intervals.
According to the embodiment of the invention, the fault reflection wave meeting the preset condition in the fault judgment section is determined by setting the preset condition.
Further, on the basis of the above method embodiment, the determining, according to the fault reflected wave and the nanosecond incident pulse, a position of a branch point of a down conductor of a wind turbine blade having a fault in the fault determination section includes: according to the formula
Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.
In the embodiment of the invention, a maximum value discrimination method is used for searching the fault reflection wave. The maximum value points of the rising edge with the duration time greater than the first preset time and the falling edge with the duration time greater than the second preset time are identified as the wave crest of the fault reflected wave. For fans of different models, the time requirements for the rising edge and the falling edge of the fault reflected wave may be slightly different due to the influence of the length and the structure of the down conductor. If the fault reflected wave peak meeting the preset condition is found, the position of the branch point of the fan blade down lead with the fault can be determined according to the propagation speed of the nanosecond incident pulse in the fan blade down lead and the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak. And the position L of the branch point of the failed fan blade down conductor is the distance between the branch point of the failed fan blade down conductor and the measuring point. In particular, the amount of the solvent to be used,
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; Δ t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak.
It should be noted that the propagation velocity v of the nanosecond incident pulse in the down conductor of the blade can be obtained by averaging multiple actual measurements. The measurement point is the leftmost side of the schematic view of fig. 3(a) facing the windward side of the fan blade, i.e. the root of the fan blade.
Fig. 4 shows a schematic structural diagram of a blade down conductor fault detection and location device provided in this embodiment, where the device includes: an acquisition module 41, a correlation processing module 42, a division module 43, a first determination module 44, and a second determination module 45;
the acquiring module 41 is configured to acquire propagation waveforms of nanosecond incident pulses in a fault-free fan blade down conductor and a fan blade down conductor to be detected respectively; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;
the correlation processing module 42 is configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after the correlation processing;
the dividing module 43 is configured to divide the waveform after the related processing into fault determination sections according to the position of the fan blade down lead branch point;
the first determining module 44 is configured to determine a fault reflected wave that can meet a preset condition in the fault determination section;
the second determining module 45 is configured to determine, according to the fault reflected wave and the nanosecond incident pulse, a position of a branch point of the fan blade down conductor where a fault occurs in the fault determination section.
Further, on the basis of the above device embodiment, the correlation processing module 42 is specifically configured to:
performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;
performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;
and performing smooth fitting on the waveform subjected to the difference processing to obtain the waveform subjected to the correlation processing.
Further, on the basis of the above device embodiment, the dividing module 43 is specifically configured to: and dividing the waveform after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor.
Further, on the basis of the above device embodiment, the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
Further, on the basis of the above device embodiment, the second determining module 45 is specifically configured to: according to the formula
Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.
FIG. 5 is a logic block diagram of an electronic device according to an embodiment of the invention; the electronic device includes: a processor (processor)51, a memory (memory)52, and a bus 53;
wherein, the processor 51 and the memory 52 complete the communication with each other through the bus 53; the processor 51 is used for calling the program instructions in the memory 52 to execute the method provided by the above method embodiment.
An embodiment of the present invention also provides a non-transitory computer-readable storage medium storing a computer program, which causes the computer to execute the above method.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
It should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for detecting and positioning faults of a down lead of a fan blade is characterized by comprising the following steps:
acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected respectively; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;
performing correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing;
dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the down lead of the fan blade;
determining fault reflection waves which can meet preset conditions in the fault judging section;
determining the position of a branch point of a fan blade down lead with a fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse;
the correlating the first propagated waveform with the second propagated waveform to obtain a correlated waveform includes:
performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;
performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;
smoothly fitting the waveform subjected to the difference processing to obtain the waveform subjected to the relevant processing;
the dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the down lead of the fan blade comprises the following steps:
dividing the waveforms after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor respectively;
the number of the fault judging sections is the same as that of the fan blade down conductor branch points, and each fault judging section is provided with only one fan blade down conductor branch point;
the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
2. The method for detecting and locating the fault of the fan blade down conductor according to claim 1, wherein the determining the position of the branch point of the fan blade down conductor with the fault in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse includes: according to the formula
Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;
wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.
3. The utility model provides a fan blade downlead fault detection and positioner, its characterized in that includes: the device comprises an acquisition module, a related processing module, a dividing module, a first determining module and a second determining module;
the acquisition module is used for respectively acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;
the correlation processing module is configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after the correlation processing;
the dividing module is used for dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the fan blade down lead;
the first determining module is configured to determine a fault reflected wave that can meet a preset condition in the fault determination section;
the second determining module is configured to determine, according to the fault reflected wave and the nanosecond incident pulse, a position of a branch point of a fan blade down lead in the fault determination section, where a fault occurs;
the relevant processing module is specifically configured to:
performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;
performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;
smoothly fitting the waveform subjected to the difference processing to obtain the waveform subjected to the relevant processing;
the dividing module is specifically configured to: dividing the waveforms after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor respectively; the number of the fault judging sections is the same as that of the fan blade down conductor branch points, and each fault judging section is provided with only one fan blade down conductor branch point;
the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.
4. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, implements the method of detecting and locating a fault in a down conductor of a wind turbine blade according to any of claims 1 to 2.
5. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of fan blade down conductor fault detection and location of any of claims 1-2.
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| CN201911077419.6A CN110792564B (en) | 2019-11-06 | 2019-11-06 | Method and device for detecting and positioning down lead fault of fan blade |
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