CN101520643A - Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution - Google Patents
Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution Download PDFInfo
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- CN101520643A CN101520643A CN200910068299A CN200910068299A CN101520643A CN 101520643 A CN101520643 A CN 101520643A CN 200910068299 A CN200910068299 A CN 200910068299A CN 200910068299 A CN200910068299 A CN 200910068299A CN 101520643 A CN101520643 A CN 101520643A
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Abstract
The invention belongs to the technical field of hydrogen production by water electrolysis, in particular relates to a method for diagnosing the fault of a rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution. A decomposing layer number n of wavelets is chosen according to a frequency band where a fault signal among signals is positioned; db1 and db3 are used as generating functions of the wavelets, multiresolution decomposition of n to 1 layers are respectively carried out so as to decompose the original fault signal into n sequences with each of which having only one component; each component is analyzed according to the Wigner-Ville distribution, the Wigner-Ville distribution of all the sequences are combined to form the time frequency of the original signal, and the multiple dimensioned on-line analytical method of the signal is realized. The method can greatly enhance the accuracy for diagnosing the fault, the reliability and the maintenance level of the prior rectifying cabinet for producing hydrogen by water electrolysis so as to ensure that equipment for producing hydrogen by water electrolysis safely and reliably works.
Description
Technical field
The invention belongs to water electrolysis hydrogen producing control technology field, be specifically related to a kind of water electrolysis hydrogen producing rectifier cabinet method for diagnosing faults.
Background technology
The electrolytic rectifier cabinet is one of important device of water electrolysis hydrogen producing system, produces significant to safe and reliable hydrogen manufacturing.Its effect is that alternating current is changed into direct current.Rectifier transformer can being built in the rectifier cabinet of low capacity (general 100KVA being following).The apparatus for electrolyzing rectification scheme has two kinds of silicon controlled rectifier and silicon rectifiers.Though along with the development of technology such as power electronics, the reliability of rectifier cabinet is more and more higher, still there are dissimilar faults such as transformer fault, transistors breakdown, sensor fault and control loop fault.Though current electrolysis rectifier cabinet fault detection method has comprised ground wave conformal analysis, analysis of spectrum and based on method for diagnosing faults such as neural networks, but the most frequently used method for diagnosing faults is still the direct current output waveform with single trace oscilloscope test rectifier cabinet, with the conventional tour methods such as AC wave shape of pincerlike meter test transformer.It overhauls conventional way and normally overhauls major loop earlier according to overhaul procedure, back maintenance control loop.But a certain node breaks down in the loop, often shows many point failures, makes to judge that change is difficult, repairs complexity, and the time that needs repairing is longer, and the execute-in-place effect is often bad.So keeping in repair particularly at rectifier cabinet needs to simplify maintenance process under the case of emergency, sets up new on-line fault diagnosis method, thus the operation of fast quick-recovery water electrolysis hydrogen producing system.
Summary of the invention
The present invention is directed to problems such as existing simple, consuming time length of water electrolysis hydrogen producing rectifier cabinet method for diagnosing faults and reliability are not high, a kind of signal analysis method based on wavelet transformation and Wigner-Ville distribution has been proposed, realization is to the inline diagnosis of water electrolysis hydrogen producing rectifier cabinet fault, can improve accuracy, reliability and the maintenance level of existing water electrolysis hydrogen producing rectifier cabinet fault diagnosis greatly, thereby guarantee the more safe and reliable work of water electrolysis hydrogen producing equipment.For this reason, the present invention adopts following technical scheme:
A kind of rectifier cabinet method for diagnosing faults based on wavelet transformation and Wigner-Ville distribution, dc signal with the rectifier cabinet output of extracting, directly deliver to distributed I/O, be forwarded to the PLC control station by fieldbus then, be ultimately delivered to the local monitor station, the signal analysis that on the local monitor station, is achieved as follows:
(1), selects wavelet decomposition number of plies n according to the fault-signal place frequency range in the signal;
(2) select for use db1 and db3 as wavelet mother function, and do n-1 layer multiresolution respectively and decompose, the primary fault signal decomposition is become n sequence, each sequence has only a component;
(3) each component is carried out the Wigner-Ville distributional analysis, again each sequence Wigner-Ville distributed combination is formed the time-frequency distributions of original signal, realize the multiple dimensioned on-line analysis of signal.
The present invention has following technique effect:
(1) adopt novel time frequency analysis strategy---based on the signal analysis method of wavelet transformation and Wigner-Ville distribution, realize the non-intrusion type inline diagnosis and the analysis of water electrolysis hydrogen producing rectifier cabinet fault, improved the level and the reliability of fault diagnosis.
(2) the hybrid network control technology that combines with Industrial Ethernet by fieldbus has realized the Microcomputer Detecting and the analysis of water electrolysis hydrogen producing rectifier cabinet fault, for the realization of its real-time guard and predictive maintenance is laid a good foundation.
(3) can realize the three-dimensional Wigner-Ville distribution plan visual representation of the multiscale analysis and the fault-signal of fault-signal.
(4) the fault detect strategy process is simple, and outfit is few, can realize the detection and the diagnosis of dependent failure fast, thereby improves the reliability of water electrolysis rectifier cabinet and control system thereof greatly, guarantees the operation of hydrogen producer long-term safety.
(5) other functions in the water electrolysis hydrogen producing system and other water electrolysis hydrogen producing systems can be increased to the existing network topology well, realize " plug and play " formula function.
Description of drawings
Fig. 1 is a water electrolysis hydrogen producing rectifier cabinet theory diagram.
Fig. 2 is rectifier cabinet failure detection schemes figure.
Fig. 3 is based on the Wigner-Ville time frequency analysis strategy block diagram of wavelet transformation.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a water electrolysis hydrogen producing rectifier cabinet schematic diagram, and the present embodiment research object is for being input as 380V/114A, being output as 1012A/53V water electrolysis hydrogen producing rectifier cabinet.
In order to solve the problem that water electrolysis hydrogen producing rectifier cabinet shown in Figure 1 exists at present in fault analysis and diagnosis, the invention provides a kind of online water electrolysis hydrogen producing rectifier cabinet failure detection schemes of control Network Based, water electrolysis hydrogen producing hydrogen manufacturing rectifier cabinet fault diagnosis system is mainly by rectifier cabinet, current sample sensor, PLC distributed I/O, PLC control station, local monitor station etc. are partly formed, and its basic structure as shown in Figure 2.
The present invention proposes the signal analysis strategy based on wavelet transformation and Wigner-Ville distribution as shown in Figure 3; and it is applied in the fault diagnosis of rectifier cabinet; realization has reduced the stop time and the maintenance cost of hydrogen producer to the timely analysis and the processing of rectifier cabinet fault.
With rectifier cabinet output DC stream is sampled signal, directly its simulating signal is sent to distributed I/O (ET200), adopt the PROFIBUS-DP bus to be sent to the PLC control station then, be sent to the local monitor station by Industrial Ethernet more at last and carry out time frequency analysis, realize the real-time monitoring of water electrolysis hydrogen producing equipment rectifier cabinet fault.
The fault diagnosis scheme that adopt between distributed I/O and the PLC control station that the PROFIBUS-DP bus is connected, the Industrial Ethernet of employing fiber medium is connected between PLC control station and the local monitor station, not only can improve data rate, the real-time of assurance system, other functions that can also guarantee the water electrolysis hydrogen producing apparatus control system also can realize by this network topology, thereby realize the network control of whole water electrolysis hydrogen producing apparatus control system.
The present invention mainly adopts the PROFIBUS bussing technique of Industrial Ethernet technology and Siemens Company to realize the Network Transmission of the current failure signal of rectifier cabinet dc bus sampled point to host computer (local monitor station), then by based on the Wigner-Ville time frequency analysis strategy of wavelet transformation it being analyzed and diagnosing.System mainly partly is made up of the water electrolysis hydrogen producing equipment that comprises rectifier cabinet, current sensor, distributed I/O, PLC control station and local monitor station etc.
As shown in Figure 2, whole network monitoring strategy can be divided into 2 layers, low layer by the PROFIBUS-DP bus with distributed I/O---ET200 is connected with cell level PLC control station, communicating by letter between upper strata employing Industrial Ethernet technology realization local monitor station and the PLC control station.Distributed I/O---the electric current among the ET200 adopts signal directly to be obtained by the PLC analog input module by current sensor.
The present invention proposes the Wigner-Ville signal analysis strategy based on wavelet transformation as shown in Figure 3, is used on the local monitor station water electrolysis hydrogen producing rectifier cabinet fault is carried out time frequency analysis.According to actual diagnosis effect, this strategy at first selects for use db1 and db3 as wavelet mother function, and does n-1 layer multiresolution respectively and decompose, and s resolves into a plurality of sequences the primary fault signal, each sequence have only a component (s1, s2, s3 ... sn).Wavelet decomposition number of plies n depends on the fault-signal place frequency range in the signal, generally chooses 5-7 here and gets final product.Concrete number detects the effect decision by the type and the physical fault of fault.Then each component is carried out the Wigner-Ville distributional analysis, again the Wigner-Ville distributed combination of each sequence is formed the time-frequency distributions WVDs of original signal, can eliminate distracter like this, not influence the time-frequency aggregation that Wigner-Ville distributes again, and realize the multiscale analysis of signal.This Analysis on Fault Diagnosis strategy has been realized on-line analysis and the diagnosis to the various most common failures of rectifier cabinet, has reduced the stop time and the maintenance cost of hydrogen producer.The network topology that simultaneous faults diagnosis is adopted has good expandability and compatibility, can with other control function of hydrogen producer or other water electrolysis hydrogen producing apparatus control systems easy easily be incorporated into this network topology.
The comparatively detailed content of relevant Wigner-Ville distributional analysis method, can be referring to following paper: wavelet transformation be used for the inhibition/Fu Haiwei of Wigner-Ville distribution cross term, Fu Junmei // Xi'an shiyou University's journal: natural science edition-2001.16 (5) .-37-39.This article has provided a kind of Wigner-Ville distribution cross term inhibition method based on wavelet transformation, but this method is that original signal is made .Wigner-Ville distribution time frequency analysis earlier, then time-frequency distributions is done wavelet decomposition and reconstruct, obtained new Wigner-Ville distribution plan.The present invention then earlier carries out multiple dimensioned decomposition to original signal, then the many groups signal after decomposing is carried out the Wigner-Ville distributional analysis respectively, obtain Wigner-Ville time-frequency distributions separately, make up the Wigner-Ville that obtains original signal at last and distribute.
Claims (1)
1. rectifier cabinet method for diagnosing faults that distributes based on wavelet transformation and Wigner-Ville, dc signal with the rectifier cabinet output of extracting, directly deliver to distributed I/O, be forwarded to the PLC control station by fieldbus then, be ultimately delivered to the local monitor station, the signal analysis that on the local monitor station, is achieved as follows:
(1), selects wavelet decomposition number of plies n according to the fault-signal place frequency range in the signal;
(2) select for use db1 and db3 as wavelet mother function, and do n-1 layer multiresolution respectively and decompose, the primary fault signal decomposition is become n sequence, each sequence has only a component;
(3) each component is carried out the Wigner-Ville distributional analysis, again each sequence Wigner-Ville distributed combination is formed the time-frequency distributions of original signal, realize the multiple dimensioned on-line analysis of signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693546A (en) * | 2011-03-23 | 2012-09-26 | 苏州大学 | Signal time frequency characteristic image generation method and device thereof |
| CN108330510A (en) * | 2018-04-10 | 2018-07-27 | 中南大学 | Apparent alumina concentration abstracting method and equipment for aluminium cell process control |
| CN109117807A (en) * | 2018-08-24 | 2019-01-01 | 广东石油化工学院 | A kind of plc communication signal adaptive time-frequency method method and system |
-
2009
- 2009-03-30 CN CN2009100682993A patent/CN101520643B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693546A (en) * | 2011-03-23 | 2012-09-26 | 苏州大学 | Signal time frequency characteristic image generation method and device thereof |
| CN108330510A (en) * | 2018-04-10 | 2018-07-27 | 中南大学 | Apparent alumina concentration abstracting method and equipment for aluminium cell process control |
| CN109117807A (en) * | 2018-08-24 | 2019-01-01 | 广东石油化工学院 | A kind of plc communication signal adaptive time-frequency method method and system |
| CN109117807B (en) * | 2018-08-24 | 2020-07-21 | 广东石油化工学院 | Self-adaptive time-frequency peak value filtering method and system for P L C communication signals |
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