CN115792762B - Partial discharge signal reconstruction method and device for hydraulic generator - Google Patents
Partial discharge signal reconstruction method and device for hydraulic generator Download PDFInfo
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Abstract
The embodiment of the application provides a partial discharge signal reconstruction method and device for a hydraulic generator, which belong to the technical field of high-frequency partial discharge tests, and the method comprises the following steps: obtaining a partial discharge signal of a hydraulic generator; dividing the partial discharge signal into pulse sequences to obtain a pulse sequence unit; performing characteristic marking treatment on the pulse sequence unit to obtain a marked pulse sequence unit; performing redundant data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing; and carrying out statistical analysis on the pulse sequence units after the treatment to obtain an analysis result, and drawing a target map based on the analysis result. According to the method, the partial discharge signals of the hydraulic generator are subjected to pulse sequence division processing, redundant data are deleted as far as possible, statistical analysis is performed on the redundant data, and a target map is drawn, so that reconstruction of mass data of the partial discharge of the hydraulic generator is realized.
Description
Technical Field
The application relates to the technical field of computers, in particular to a partial discharge signal reconstruction method of a hydraulic generator, a partial discharge signal reconstruction device of the hydraulic generator, a machine-readable storage medium and a processor.
Background
The stator winding of the large-sized hydraulic generator has a complex insulation structure and difficult analysis of physical characteristics and transient processes. As the fault occurrence and the diffraction mechanism are not fully known, the method is influenced by factors such as technological parameter dispersion in the stator bar localization process. In recent years, the problem of partial discharge of stator windings of large hydraulic generators is increasingly prominent. The significance of carrying out the insulating state evaluation is great, and practice shows that the failure loss can be greatly reduced when the insulating failure is detected as soon as possible.
The traditional low-frequency partial discharge test technology has the problem that the test result shows fluctuation due to insufficient sampling rate. In addition, partial discharge pulses are submerged in background noise and are difficult to identify under the influence of the absorption effect of a large-capacity sample of a large-sized hydraulic generator and background interference. The background interference of the large-sized hydraulic generator is large, partial discharge pulse aliasing is carried out in an interference signal, the acquired signal sequence is fragmented due to insufficient flexibility of setting triggering conditions of an oscilloscope scheme, and the partial discharge signal and the interference signal are contained at the same time, so that the partial discharge characteristic information is very difficult to restore.
At present, a technical scheme for collecting and storing partial discharge signals of a large-sized hydraulic generator at high speed and reconstructing massive partial discharge signals does not exist.
Disclosure of Invention
The embodiment of the application aims to provide a partial discharge signal reconstruction method and device for a hydraulic generator, which at least solve the technical problem of reconstruction of massive partial discharge signals of the hydraulic generator in the background art, and achieve the aim of deleting redundant data through reconstruction of massive partial discharge data.
To achieve the above object, a first aspect of the present application provides a partial discharge signal reconstruction method of a hydraulic generator, the method including:
obtaining a partial discharge signal of a hydraulic generator;
dividing the partial discharge signal into pulse sequences to obtain a pulse sequence unit;
performing characteristic marking treatment on the pulse sequence unit to obtain a marked pulse sequence unit;
performing redundant data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing;
and carrying out statistical analysis on the pulse sequence units after the treatment to obtain an analysis result, and drawing a target map based on the analysis result.
In an embodiment of the present application, the dividing the pulse sequence of the local discharge signal includes: and carrying out pulse sequence division on the partial discharge signals by adopting an equidistant division method.
In an embodiment of the present application, the dividing the pulse sequence of the local discharge signal includes: and carrying out pulse sequence division on the partial discharge signal by adopting a trigger division method.
In the embodiment of the present application, the partial discharge signal is a discrete signal sequence U N The method for performing pulse sequence division on the partial discharge signal by adopting a trigger division method comprises the following steps:
determining the discrete signal sequence U N Energy function U of (2) N (n)；
Setting the energy triggering threshold to be T h ；
Based on the energy function U N (n) and the energy triggering threshold T h And carrying out pulse sequence division on the partial discharge signals.
In the embodiment of the application, the energy function U is based on N (n) and the energy triggering threshold T h Performing pulse sequence division on the partial discharge signal, including:
calculating the discrete signal sequence U N State variable η (n) of (a);
determining a trigger point according to the state variable eta (n);
and dividing the pulse sequence of the partial discharge signal based on the trigger point.
In this embodiment of the present application, the determining a trigger point according to the state variable η (n) includes:
when the energy function U N (n) is greater than the energy triggering threshold T h When the state variable of the response is set to 1; when the energy function U N (n) is less than the energy triggering threshold T h When the state variable of the response is set to 0; when the state variable changes from 0 to 1 or from 1 to 0, the trigger point is recorded:
wherein η (n) represents the discrete signal sequence U N State variables of (2).
In an embodiment of the present application, the dividing the pulse sequence of the partial discharge signal based on the trigger point includes:
when the ith trigger point is identified, starting pulse sequence recording, and when the (i+1) th trigger point is identified, stopping pulse sequence recording, so as to complete pulse sequence division; wherein i is a natural number of 1 or more.
In this embodiment of the present application, performing feature labeling processing on the pulse sequence unit to obtain a labeled pulse sequence unit, including: and carrying out characteristic marking on the non-trigger pulse sequence in the pulse sequence unit to obtain a marked non-trigger pulse sequence.
In an embodiment of the present application, the performing redundant data deletion processing on the marking pulse sequence unit includes: and deleting the marked non-trigger pulse sequence to obtain a trigger pulse sequence.
In an embodiment of the present application, the performing statistical analysis on the pulse sequence unit after the processing to obtain an analysis result, and drawing a target map based on the analysis result includes:
and carrying out time sequence analysis on the trigger pulse sequence by adopting a time sequence dependent statistical analysis method to obtain a time sequence analysis result, and drawing a time sequence dependent statistical map based on the time sequence analysis result.
In an embodiment of the present application, the performing statistical analysis on the pulse sequence unit after the processing to obtain an analysis result, and drawing a target map based on the analysis result includes:
and carrying out phase analysis on the trigger pulse sequence by adopting a phase-dependent statistical analysis method to obtain a phase analysis result, and drawing a phase-dependent discharge spectrum based on the phase analysis result.
A second aspect of the present application provides a partial discharge signal reconstruction device for a hydro-generator, the device comprising:
the acquisition module is used for acquiring partial discharge signals of the hydraulic generator;
the pulse sequence dividing module is used for dividing the pulse sequence of the partial discharge signal to obtain a pulse sequence unit;
the characteristic marking module is used for carrying out characteristic marking processing on the pulse sequence unit to obtain a marked pulse sequence unit;
the redundancy processing module is used for performing redundancy data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing;
and the drawing module is used for carrying out statistical analysis on the processed pulse sequence units to obtain an analysis result and drawing a target map based on the analysis result.
A third aspect of the present application provides a processor configured to perform the above-described method of partial discharge signal reconstruction of a hydro-generator.
A fourth aspect of the present application provides a machine-readable storage medium having stored thereon instructions that, when executed by a processor, cause the processor to be configured to perform the above-described hydro-generator partial discharge signal reconstruction method.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the method comprises the steps of carrying out pulse sequence division processing on the obtained partial discharge signals of the hydraulic generator, deleting redundant data as far as possible, carrying out statistical analysis on the redundant data, and drawing a target map, so that the reconstruction of mass partial discharge data of the hydraulic generator is realized.
Additional features and advantages of embodiments of the present application will be set forth in the detailed description that follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain, without limitation, the embodiments of the present application. In the drawings:
fig. 1 schematically illustrates an application environment of a partial discharge signal reconstruction method of a hydro-generator according to an embodiment of the present application;
FIG. 2 schematically illustrates a flow diagram of a method of partial discharge signal reconstruction for a hydro-generator according to an embodiment of the application;
FIG. 3 schematically illustrates a pulse sequence unit data structure diagram according to an embodiment of the present application;
FIG. 4 schematically illustrates a schematic diagram of an equidistant partitioning method according to an embodiment of the present application;
FIG. 5 schematically illustrates a trigger partitioning method according to an embodiment of the present application;
FIG. 6 schematically illustrates a timing dependency statistical graph according to an embodiment of the present application;
FIG. 7 schematically illustrates a phase dependent discharge pattern according to an embodiment of the present application;
fig. 8 schematically shows a block diagram of a partial discharge signal reconstruction device of a hydro-generator according to an embodiment of the application;
fig. 9 schematically shows an internal structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the specific implementations described herein are only for illustrating and explaining the embodiments of the present application, and are not intended to limit the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
It should be noted that, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is only for descriptive purposes, and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
The partial discharge signal reconstruction method for the hydraulic generator can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The terminal 102 may be, but not limited to, various personal computers, notebook computers, smartphones, tablet computers, and portable wearable devices, and the server 104 may be implemented by a stand-alone server or a server cluster composed of a plurality of servers.
Fig. 2 schematically shows a flow chart of a method for reconstructing partial discharge signals of a hydro-generator according to an embodiment of the application. As shown in fig. 2, in an embodiment of the present application, a partial discharge signal reconstruction method of a hydraulic generator is provided, and this embodiment is mainly applied to the terminal 102 (or the server 104) in fig. 1 to illustrate the method, and includes the following steps:
step 110, obtaining partial discharge signals of the hydraulic generator.
In this embodiment, the partial discharge signal of the hydro-generator is derived from a data storage device, for example, the partial discharge signal of the hydro-generator may be obtained by a disk array storing the partial discharge signal of the hydro-generator.
In this embodiment, the collected partial discharge signal of the hydraulic generator is a discrete signal sequence U N The sequence length is L and the time interval is Δt. For convenience of description, it is assumed that the sequence division mode is determined, and the collected partial discharge signal components of the hydraulic generator are unique and known. Collected partial discharge signal U of hydraulic generator N From L 1 Interference sequence X N And L 2 Pulse sequence Y of partial discharge N The composition, delta and gamma respectively represent sequence groups, and are determined by a sequence division method.
U N (n)|n＝1,2…,L＝{X N (δ)|N＝1,2…,L 1 }+{Y N (γ)|N＝1,2…,L 2 } (1)；
In U N (n) represents partial discharge signal of hydraulic generator, X N Representing interference sequences, Y N Representing a partial discharge pulse sequence.
And 120, dividing the partial discharge signal into pulse sequences to obtain pulse sequence units.
The pulse train unit is the smallest data unit for data processing, and as shown in fig. 3, the pulse train unit is a data set and is stored in three parts: sequence header, digital sequence and sequence tail. The sequence head stores global information of the pulse sequence unit, including sequence numbers, trigger time, sequence length and the like; storing the divided partial discharge signal sequences in the digital sequence; the sequence tail stores sequence partial discharge characteristic indexes including maximum discharge quantity, phase, pulse width, rising edge and the like. Each pulse sequence unit can independently process digital signals, support data parallel processing, and greatly improve data processing analysis efficiency.
In this embodiment, the collected partial discharge signals of the hydraulic generator may be divided into two ways to perform pulse sequence division, and the divided sequences are stored according to the pulse sequence unit data structure in fig. 3. The two pulse sequence dividing modes are as follows: equidistant partitioning methods (as shown in fig. 4) and triggered partitioning methods (as shown in fig. 5).
a) Equidistant dividing method:
the partial discharge is generated because the electric field between the intervals reaches a breakdown value, and the partial discharge signal is tested to be highly correlated with the power frequency voltage instantaneous value, so that the power frequency periodic characteristic is presented. By utilizing the power frequency periodic characteristic, the embodiment designs a power frequency associated pulse sequence unit equidistant dividing method. Selecting a forward zero crossing point of the power frequency voltage in the partial discharge generation high-voltage loop as a timing point, wherein the minimum dividing unit is one quarter of the power frequency, ignoring frequency deviation, converting according to 50Hz, and obtaining a minimum dividing interval of 5ms by a pulse sequence unit; in addition, it is also proposed that the minimum statistical unit is 10 power frequency cycles in statistical sense, and conversion is performed according to 50Hz, i.e. the minimum statistical unit is 200ms. The statistical interval represents the time interval between the smallest statistical units, for example 200ms, and an equidistant division of the 1000ms partial discharge signal is shown in fig. 4.
b) The triggering and dividing method comprises the following steps:
selecting N partial discharge signal sample points to calculate an energy function E n Setting a threshold T according to the background noise h When the energy function E n Greater than or equal to the set threshold T h When the trigger condition is met, the pulse sequence unit starts to be recorded. When the energy is the function E n Less than a set threshold T h When this is the case, the recording pulse sequence is stopped.
Time sequence calculation U according to formula (1) N And drawing a time sequence curve of the energy function, taking the ith point as an example.
δ x ＝VAR(U N (i),U N (i+1),…U N (i+N-1)) (2)；
Wherein E is i Represents the ith sequence U N Energy function, delta x Represents the ith sequence U N Is a variance of (c).
In this embodiment, a trigger division method is used for a scenario with data storage compression priority, where the interference sequence is X N (δ 1 ) The pulse sequence is Y N (γ 1 ) The method comprises the steps of carrying out a first treatment on the surface of the For the scene with the priority of calculating the speed, an equidistant dividing method is adopted, and the interference sequence is X N (δ 2 ) The pulse sequence is Y N (γ 2 )。
Setting the trigger threshold to be T h Calculating state variable eta (n), traversing energy function U N (n) dividing all sampling points into two states when the energy function is greater than T h When the state variable of the response is set to 1; when the energy function is smaller than T h The state variable of the response is set to 0.
The trigger points are determined according to the state variables, when the state variables are changed from 0 to 1 or from 1 to 0, the trigger points are recorded, as shown in fig. 5, 6 trigger points are recorded altogether:
when the 1 st trigger point (trigger 1) is identified, starting pulse sequence recording until the next trigger point (trigger 2) is identified, and stopping pulse sequence recording; and so on to complete the pulse sequence division.
Let the recorded ith pulse sequence be Y N (γ i ) The recording is performed according to the pulse train unit data structure shown in fig. 3, and the cell array is used for storage.
And 130, performing feature labeling processing on the pulse sequence unit to obtain a labeled pulse sequence unit.
In this embodiment, a single pulse sequence is marked, including the trigger time and sequence length in the sequence header, the maximum discharge in the sequence tail, the phase, the pulse width, the rising edge.
The partial discharge feature mark adopts an array data processing method to process the pulse sequence unit group, performs array operation according to the index characteristics of the pulse sequence unit, and performs redundant data deletion and partial discharge statistical analysis according to requirements.
The sequence tail of the pulse sequence unit of the embodiment stores partial discharge characteristic indexes, and the pulse sequence unit divided by a certain trigger is taken as Y n For example, the sequence length is N, the sampling time interval is deltat, and the maximum discharge, phase, pulse width and rising edge are calculated.
a) Maximum discharge amount:
Q max ＝MAX(Y n )×β (5)
in MAX (Y) n ) For pulse train unit Y n Is expressed in mv, beta is a discharge amount correction coefficient, and the maximum discharge amount Q max The units are converted to pC.
b) Phase of
Taking the positive zero crossing point of the power frequency voltage of the high-voltage test loop as a reference time point, and taking the power frequency voltage of the high-voltage test loop as a reference time pointThe trigger time t is taken out of the sequence header of the pulse sequence unit 1 Selecting the nearest reference time point t 2 The power frequency cycle time T takes 20ms, and the phase of the partial discharge signal is as follows:
c) Pulse width
Setting pulse counting threshold delta, pulse sequence unit Y n The kth element Y n (k) If the pulse count is greater than the pulse count threshold delta, counting is started. When Y is n When (k+M) is smaller than Δδ, the counting is ended. Pulse width is expressed in terms of time length:
τ＝M×Δt (7)
d) Rising edge
Setting a rising edge counting threshold delta xi and a pulse sequence unit Y n Ith element Y n (i) Greater than the pulse count threshold Δζ, counting begins. And if the (i+K) th element reaches the extreme point, the counting is ended. The rising edge is expressed in terms of the length of time:
dγ＝K×Δt (8)
and (5) calculating the maximum discharge amount, the phase, the pulse width and the rising edge according to the formula (5) -the formula (8).
{(t i1 ),(l),(Q maxi ),(θ i ),(τ i ),(dγ i )}
And 140, performing redundant data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing.
In this embodiment, the redundant data deleting process is to delete the pulse sequence that is not triggered, as shown by the dotted line in fig. 5, further screen the pulse sequence, and illustrate the maximum partial discharge, and the pulse sequence stored in fig. 5 is 3, only the pulse with the maximum partial discharge is maintained, and the other two pulses are used for redundant data deleting.
And 150, carrying out statistical analysis on the pulse sequence units after the processing to obtain an analysis result, and drawing a target map based on the analysis result.
In this embodiment, the statistical analysis includes: and (3) carrying out time sequence analysis on the reserved pulse sequence, sorting according to time marks ti in a pulse sequence cell array, extracting relevant characteristic indexes according to requirements, and drawing a time sequence dependency statistical map, as shown in fig. 6.
In this embodiment, the statistical analysis further includes: the phase dependence analysis is carried out on the reserved pulses, the sorting is carried out according to the phase marks thetai in the pulse sequence cell arrays, the value range interval is equally divided into N1 parts, the sorting is carried out according to the partial discharge marks Qmaxi in the pulse sequence cell arrays, the value range interval is equally divided into N2 parts, all the pulse sequence cell arrays are traversed, the number of the cell arrays in the phase and partial discharge coordinate space is counted and equally divided, and the phase dependence discharge spectrum, which can also be called as a discharge fingerprint spectrum, is drawn, as shown in figure 7.
The embodiment adopts a pulse sequence division technology and a partial discharge characteristic index technology to realize reconstruction of partial discharge mass data and extraction of partial discharge characteristic indexes of the large-scale hydro-generator.
Fig. 2 is a flow chart of a partial discharge signal reconstruction method of a water wheel generator according to an embodiment. It should be understood that, although the steps in the flowchart of fig. 2 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 2 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
In one embodiment, as shown in fig. 8, there is provided a partial discharge signal reconstruction apparatus of a hydraulic generator, including an acquisition module 210, a pulse sequence dividing module 220, a feature labeling module 230, a redundancy processing module 240, and a drawing module 250, wherein:
an acquisition module 210, configured to acquire a partial discharge signal of the hydraulic generator;
the pulse sequence dividing module 220 is configured to perform pulse sequence division on the partial discharge signal to obtain a pulse sequence unit;
the feature labeling module 230 is configured to perform feature labeling processing on the pulse sequence unit to obtain a labeled pulse sequence unit;
a redundancy processing module 240, configured to perform redundancy data deletion processing on the marked pulse sequence unit, to obtain a pulse sequence unit after processing;
and the drawing module 250 performs statistical analysis on the pulse sequence units after the processing to obtain an analysis result, and draws a target map based on the analysis result.
The partial discharge signal reconstruction device of the hydraulic generator comprises a processor and a memory, wherein the acquisition module 210, the pulse sequence dividing module 220, the characteristic marking module 230, the redundancy processing module 240, the drawing module 250 and the like are all stored in the memory as program units, and the processor executes the program modules stored in the memory to realize corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the partial discharge signal reconstruction method of the hydraulic generator is realized by adjusting the parameters of the inner core.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the application provides a storage medium, and a program is stored on the storage medium, and the program realizes the partial discharge signal reconstruction method of the hydraulic generator when being executed by a processor.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 9. The computer apparatus includes a processor a01, a network interface a02, a display screen a04, an input device a05, and a memory (not shown in the figure) which are connected through a system bus. Wherein the processor a01 of the computer device is adapted to provide computing and control capabilities. The memory of the computer device includes an internal memory a03 and a nonvolatile storage medium a06. The nonvolatile storage medium a06 stores an operating system B01 and a computer program B02. The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a06. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program, when executed by the processor a01, implements a method for reconstructing partial discharge signals of a hydro-generator. The display screen a04 of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device a05 of the computer device may be a touch layer covered on the display screen, or may be a key, a track ball or a touch pad arranged on a casing of the computer device, or may be an external keyboard, a touch pad or a mouse.
It will be appreciated by those skilled in the art that the structure shown in fig. 9 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application applies, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, the partial discharge signal reconstruction device of the hydraulic generator provided by the application may be implemented as a computer program, and the computer program may be run on a computer device as shown in fig. 9. The memory of the computer device may store various program modules constituting the partial discharge signal reconstruction device of the hydraulic generator, such as the acquisition module 210, the pulse sequence dividing module 220, the feature labeling module 230, the redundancy processing module 240, and the drawing module 250 shown in fig. 8. The computer program of each program module causes the processor to execute the steps in the method for reconstructing partial discharge signals of the hydro-generator according to each embodiment of the present application described in the present specification.
The computer apparatus shown in fig. 9 may perform step 110 by means of the acquisition module 210 in the partial discharge signal reconstruction device of the hydro-generator as shown in fig. 8. The computer device may perform step 120 by the pulse sequence dividing module 220. The computer device may perform step 130 through the feature labeling module 230. The computer device may perform step 140 via the redundancy processing module 240. The computer device may perform step 150 through the rendering module 250.
The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the following steps:
step 110, obtaining partial discharge signals of the hydraulic generator.
And 120, dividing the partial discharge signal into pulse sequences to obtain pulse sequence units.
And 130, performing feature labeling processing on the pulse sequence unit to obtain a labeled pulse sequence unit.
And 140, performing redundant data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing.
And 150, carrying out statistical analysis on the pulse sequence units after the processing to obtain an analysis result, and drawing a target map based on the analysis result.
In one embodiment, the pulse sequence dividing of the partial discharge signal includes: and carrying out pulse sequence division on the partial discharge signals by adopting an equidistant division method.
In one embodiment, the pulse sequence dividing of the partial discharge signal includes: and carrying out pulse sequence division on the partial discharge signal by adopting a trigger division method.
In one embodiment, the partial discharge signal is a discrete signal sequence U N The method for performing pulse sequence division on the partial discharge signal by adopting a trigger division method comprises the following steps:
determining the discrete signal sequence U N Energy function U of (2) N (n)；
Setting the energy triggering threshold to be T h ；
Based on the energy function U N (n) and the energy triggering threshold T h And carrying out pulse sequence division on the partial discharge signals.
In one embodiment, the energy-based function U N (n) and the energy triggering threshold T h Performing pulse sequence division on the partial discharge signal, including:
calculating the discrete signal sequence U N State variable η (n) of (a);
determining a trigger point according to the state variable eta (n);
and dividing the pulse sequence of the partial discharge signal based on the trigger point.
In one embodiment, the determining the trigger point according to the state variable η (n) includes:
when the energy function U N (n) is greater than the energy triggering threshold T h When the state variable of the response is set to 1; when the energy function U N (n) is less than the energy triggering threshold T h When the state variable of the response is set to 0; when the state variable changes from 0 to 1 or from 1 to 0, the trigger point is recorded:
wherein η (n) represents the discrete signal sequence U N State variables of (2).
In one embodiment, the pulse sequence dividing the partial discharge signal based on the trigger point includes:
when the ith trigger point is identified, starting pulse sequence recording, and when the (i+1) th trigger point is identified, stopping pulse sequence recording, so as to complete pulse sequence division; wherein i is a natural number of 1 or more.
In one embodiment, the feature labeling process is performed on the pulse sequence unit to obtain a labeled pulse sequence unit, including:
and carrying out characteristic marking on the non-trigger pulse sequence in the pulse sequence unit to obtain a marked non-trigger pulse sequence.
In one embodiment, the performing redundant data deletion processing on the marking pulse sequence unit includes: and deleting the marked non-trigger pulse sequence to obtain a trigger pulse sequence.
In one embodiment, the performing statistical analysis on the pulse sequence units after the processing to obtain an analysis result, and drawing a target map based on the analysis result includes: and carrying out time sequence analysis on the trigger pulse sequence by adopting a time sequence dependent statistical analysis method to obtain a time sequence analysis result, and drawing a time sequence dependent statistical map based on the time sequence analysis result.
In one embodiment, the performing statistical analysis on the pulse sequence units after the processing to obtain an analysis result, and drawing a target map based on the analysis result includes: and carrying out phase analysis on the trigger pulse sequence by adopting a phase-dependent statistical analysis method to obtain a phase analysis result, and drawing a phase-dependent discharge spectrum based on the phase analysis result.
The embodiment adopts a pulse sequence division technology and a partial discharge characteristic index technology to realize mass data reconstruction and partial discharge characteristic index extraction.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer-readable media include both permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (9)
1. A method for reconstructing partial discharge signals of a hydro-generator, the method comprising:
obtaining a partial discharge signal of a hydraulic generator;
performing pulse sequence division on the partial discharge signal by adopting a trigger division method to obtain a pulse sequence unit;
performing characteristic marking treatment on the pulse sequence unit to obtain a marked pulse sequence unit;
performing redundant data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing;
carrying out statistical analysis on the processed pulse sequence units to obtain an analysis result, and drawing a target map based on the analysis result;
the partial discharge signal is a discrete signal sequenceU N The method comprises the steps of carrying out a first treatment on the surface of the The method for dividing the pulse sequence of the partial discharge signal by adopting a trigger dividing method comprises the following steps:
determining the discrete signal sequenceU N Energy function of (2)
Comprising: when N is i, selecting the ith, the (i+1) … (i+N-1) and counting N partial discharge signal sample points, and calculating the energy function +.>
：
Setting the energy triggering threshold asT h ；
Computing the discrete signal sequenceU N State variable η (n) of (a);
when the energy function
Greater than the energy triggering thresholdT h When the state variable of the response is set to 1; when the energy function->
Less than the energy triggering thresholdT h When the state variable of the response is set to 0; when the state changesThe quantity is changed from 0 to 1, or from 1 to 0, and the quantity is recorded as a trigger point;
and dividing the pulse sequence of the partial discharge signal based on the trigger point.
2. The method for reconstructing partial discharge signals of a hydraulic generator according to claim 1, wherein said dividing said partial discharge signals into pulse sequences based on trigger points comprises:
when the ith trigger point is identified, starting pulse sequence recording, and when the (i+1) th trigger point is identified, stopping pulse sequence recording, so as to complete pulse sequence division; wherein i is a natural number of 1 or more.
3. The partial discharge signal reconstruction method of a hydraulic generator according to claim 1, wherein performing feature labeling processing on the pulse sequence unit to obtain a labeled pulse sequence unit, comprising:
and carrying out characteristic marking on the non-trigger pulse sequence in the pulse sequence unit to obtain a marked non-trigger pulse sequence.
4. The method for reconstructing partial discharge signals of a hydraulic generator according to claim 1, wherein said performing redundant data deletion processing on the marker pulse sequence unit comprises:
and deleting the marked non-trigger pulse sequence to obtain a trigger pulse sequence.
5. The partial discharge signal reconstruction method according to claim 1, wherein the performing statistical analysis on the processed pulse sequence unit to obtain an analysis result, and drawing a target map based on the analysis result, comprises:
and carrying out time sequence analysis on the trigger pulse sequence by adopting a time sequence dependent statistical analysis method to obtain a time sequence analysis result, and drawing a time sequence dependent statistical map based on the time sequence analysis result.
6. The partial discharge signal reconstruction method according to claim 1, wherein the performing statistical analysis on the processed pulse sequence unit to obtain an analysis result, and drawing a target map based on the analysis result, comprises:
and carrying out phase analysis on the trigger pulse sequence by adopting a phase-dependent statistical analysis method to obtain a phase analysis result, and drawing a phase-dependent discharge spectrum based on the phase analysis result.
7. A partial discharge signal reconstruction device for a hydro-generator, the device comprising:
the acquisition module is used for acquiring partial discharge signals of the hydraulic generator;
the pulse sequence dividing module is used for dividing the pulse sequence of the partial discharge signal by adopting a trigger dividing method to obtain a pulse sequence unit;
the characteristic marking module is used for carrying out characteristic marking processing on the pulse sequence unit to obtain a marked pulse sequence unit;
the redundancy processing module is used for performing redundancy data deletion processing on the marked pulse sequence unit to obtain a pulse sequence unit after processing;
the drawing module is used for carrying out statistical analysis on the processed pulse sequence units to obtain an analysis result and drawing a target map based on the analysis result;
the partial discharge signal is a discrete signal sequenceU N The method comprises the steps of carrying out a first treatment on the surface of the The method for dividing the pulse sequence of the partial discharge signal by adopting a trigger dividing method comprises the following steps:
determining the discrete signal sequenceU N Energy function of (2)
Comprising: when N is i, selecting the ith, the (i+1) … (i+N-1) and counting N partial discharge signal sample points, and calculating the energy function +.>
：
Setting the energy triggering threshold asT h ；
Computing the discrete signal sequenceU N State variable η (n) of (a);
when the energy function
Greater than the energy triggering thresholdT h When the state variable of the response is set to 1; when the energy function->
Less than the energy triggering thresholdT h When the state variable of the response is set to 0; when the state variable is changed from 0 to 1 or from 1 to 0, the state variable is recorded as a trigger point;
and dividing the pulse sequence of the partial discharge signal based on the trigger point.
8. A processor configured to perform the hydro-generator partial discharge signal reconstruction method according to any one of claims 1 to 6.
9. A machine-readable storage medium having instructions stored thereon, which when executed by a processor cause the processor to be configured to perform the hydro-generator partial discharge signal reconstruction method according to any one of claims 1 to 6.
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