CN108898189B - Method and system for establishing fingerprint database of VFTO measurement data - Google Patents

Method and system for establishing fingerprint database of VFTO measurement data Download PDF

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CN108898189B
CN108898189B CN201810756748.2A CN201810756748A CN108898189B CN 108898189 B CN108898189 B CN 108898189B CN 201810756748 A CN201810756748 A CN 201810756748A CN 108898189 B CN108898189 B CN 108898189B
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gis
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CN108898189A (en
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周雷
谭向宇
王科
彭晶
赵现平
马仪
周年荣
张文斌
黄星
程志万
杨晴
李秉睿
马国明
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
    • G06F18/214—Generating training patterns; Bootstrap methods, e.g. bagging or boosting
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract

The invention discloses a method and a system for establishing a VFTO measurement data fingerprint database, wherein the establishing method comprises the steps of collecting VFTO measurement data in a GIS; performing dimensionality reduction on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set; normalizing the first parameter set to obtain a second parameter set; learning and training the second parameter set by using a neural network algorithm to obtain a training set; identifying partial VFTO measurement data by using a training set; and judging whether the identification rate of VFTO measurement data of the training set identification part meets the requirement, if so, extracting the training set to establish a fingerprint database. According to the method, a large amount of VFTO measurement data in the GIS equipment are collected, the VFTO measurement data are processed by a principal component analysis method, a normalization processing method and a neural network algorithm to generate a fingerprint database, and when the GIS equipment is detected on site, the GIS detection data on site are identified through the fingerprint database, so that the GIS fault type can be judged quickly, the problem can be located, the maintenance time of the GIS equipment is effectively saved, and the benefit is improved.

Description

Method and system for establishing fingerprint database of VFTO measurement data
Technical Field
The invention relates to the technical field of processing and analyzing VFTO measurement parameters of GIS equipment, in particular to a method and a system for establishing a VFTO measurement data fingerprint database.
Background
Gas Insulated switchgear (Gas Insulated switchgear-Gas Insulated switchgear, GIS for short) in which a circuit breaker, a disconnecting Switch, a grounding Switch, a current and voltage transformer, a lightning arrester, a bus bar for connection, and the like are enclosed in a metal case and filled with SF6Gas, acts as insulation between the phases and to ground. When the isolating switch is used for switching on and off the hollow bus, due to the fact that the contact is slow in moving speed and poor in arc extinguishing performance of the switch, multiple reignitions can occur between contact gaps. The voltage at the two ends of the DS contact gap suddenly drops within a few nanoseconds, and the voltage steep wave continuously generates traveling waves in the GIS, propagates back and forth, and generates complex refraction, reflection and superposition, so that a Very high-speed Transient Overvoltage (VFTO) is formed.
With the development of ultra-high voltage technology, GIS is widely applied, and insulation problem caused by VFTOThe problem is also gradually causing concentration of expert scholars, and more electric power scholars begin to study the hazards of VFTO. Practice has shown that the operation of circuit breakers and disconnectors in GIS can cause contact breakdown to form VFTO, which can cause significant damage to the power system. When GIS equipment is exposed to the high frequency and high voltage impact of VFTO for a long period of time, VFTO can continuously damage the insulators and ultimately the equipment insulation, with the damage to the basin insulator being the most severe. Generally, the GIS equipment is exposed to the air directly during installation, and is recharged with SF after all the equipment has been installed6A gas. However, in the process, some conductive particles are easily mixed and attached to the surface of the insulator, and when VFTO is generated, a local electric field is concentrated, so that the insulator is seriously affected, and the insulation aging of the insulator is accelerated. In the GIS pipeline, besides the equipment such as disconnecting switch, circuit breaker, arrester, fast disconnecting switch, sleeve, bus and the like, the GIS pipeline is also provided with a plurality of secondary equipment such as voltage transformers, current transformers and the like for ensuring the safe operation of the GIS equipment. When the VFTO is propagated in the GIS pipeline, the VFTO flows into secondary equipment connected with the GIS pipeline. Along with the gradual intellectualization of secondary equipment, the function is more and more perfect, and meanwhile, the secondary equipment is more and more easily influenced by electromagnetism.
After the GIS equipment fails, the detection means for the fault type and the result generated by the fault type are not complete, so that the maintenance time of the GIS equipment is longer, and the maintenance cost is higher.
Disclosure of Invention
The invention provides a method and a system for establishing a VFTO measurement data fingerprint database, which are used for solving the problem that after GIS equipment fails, the maintenance time of the GIS equipment is long due to the fact that detection means for fault types and results generated by the fault types are not complete.
In a first aspect, the present invention provides a method for creating a VFTO measurement data fingerprint library, including:
step S100: collecting VFTO measurement data in the GIS, wherein the VFTO measurement data comprises transient recovery overvoltage data acting on a GIS inner conductor and a shell, rapid transient overvoltage data acting on the GIS inner conductor and the shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outwards by the GIS shell, transient overvoltage data acting on primary equipment outside the GIS and a noise signal;
the transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage;
the rapid transient overvoltage data acting on the GIS internal conductor and the GIS internal shell comprise polarity of the rapid transient overvoltage, breakdown peak voltage of the rapid transient overvoltage, breakdown peak current of the rapid transient overvoltage and breakdown voltage change rate of the rapid transient overvoltage;
the shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage;
the electromagnetic wave data radiated outwards by the GIS shell comprise the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave;
the transient overvoltage data acting on the GIS external primary equipment comprise the polarity of the transient overvoltage, the breakdown peak voltage of the transient overvoltage, the breakdown peak current of the transient overvoltage and the breakdown voltage change rate of the transient overvoltage;
step S200: performing dimensionality reduction on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set;
step S300: normalizing the first parameter set to obtain a second parameter set;
step S400: learning and training the second parameter set by using a neural network algorithm to obtain a training set;
step S500: identifying a portion of the VFTO measurement data using the training set;
step S600: judging whether the identification rate of the VFTO measurement data of the training set identification part is greater than or equal to 99%;
step S601: and if the identification rate is greater than or equal to 99%, extracting the training set to establish a fingerprint database.
In an embodiment of the establishing method of the present invention, the method further includes: step S602: and if the identification rate is less than 99%, increasing the VFTO measurement data, and returning to the step S200.
In an embodiment of the establishing method of the present invention, the method further includes: step S101: and classifying the VFTO measurement data and respectively setting labels.
In a second aspect, the present invention provides a system for creating a fingerprint library of VFTO measurement data, comprising:
the data acquisition module is used for acquiring VFTO measurement data in the GIS, wherein the VFTO measurement data comprises transient recovery overvoltage data acting on a GIS inner conductor and a shell, fast transient overvoltage data acting on the GIS inner conductor and the shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outside the GIS shell, transient overvoltage data acting on primary equipment outside the GIS and a noise signal;
the transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage;
the rapid transient overvoltage data acting on the GIS internal conductor and the GIS internal shell comprise polarity of the rapid transient overvoltage, breakdown peak voltage of the rapid transient overvoltage, breakdown peak current of the rapid transient overvoltage and breakdown voltage change rate of the rapid transient overvoltage;
the shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage;
the electromagnetic wave data radiated outwards by the GIS shell comprise the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave;
the transient overvoltage data acting on the GIS external primary equipment comprise the polarity of the transient overvoltage, the breakdown peak voltage of the transient overvoltage, the breakdown peak current of the transient overvoltage and the breakdown voltage change rate of the transient overvoltage;
the first processing module is used for performing dimensionality reduction processing on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set;
the second processing module is used for carrying out normalization processing on the first parameter set to obtain a second parameter set;
the third processing module is used for performing learning training on the second parameter set by utilizing a neural network algorithm to generate a training set;
a data identification module for identifying a portion of the VFTO measurement data using the training set;
the judging module is used for judging whether the recognition rate of the VFTO measurement data of the training set recognition part is greater than or equal to 99%;
and the establishing module is used for extracting the training set and establishing a fingerprint database.
In an embodiment of the present invention, the system further includes: and the data classification module is used for classifying the VFTO measurement data and respectively setting labels.
According to the method for establishing the fingerprint database of the VFTO measurement data, provided by the invention, the VFTO measurement data in a large amount of GIS equipment is collected, the VFTO measurement data is processed by using a principal component analysis method, a normalization processing method and a neural network algorithm to generate the fingerprint database, and when the GIS equipment is detected on site, the GIS fault type can be quickly judged and the problem can be positioned by comparing actual detection with the fingerprint database, so that the maintenance time of the GIS equipment is effectively saved, and the benefit is improved. The method for establishing the fingerprint database has strong adaptability and can be used for establishing the fingerprint databases of GIS equipment with various specifications.
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Fig. 1 is a schematic flowchart of a method for creating a VFTO measurement data fingerprint database according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system for creating a fingerprint library of VFTO measurement data according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1, a schematic flowchart of a method for establishing a VFTO measurement data fingerprint database according to an embodiment of the present invention includes:
step S100: and collecting VFTO measurement data in the GIS, wherein the VFTO measurement data comprises transient recovery overvoltage data acting on a GIS inner conductor and a GIS shell, rapid transient overvoltage data acting on the GIS inner conductor and the GIS shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outwards by the GIS shell, transient overvoltage data acting on primary equipment outside the GIS and a noise signal.
When the VFTO measurement data is collected, various types of data samples in various GIS devices are collected as much as possible so as to ensure the richness of the VFTO measurement data.
The transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage.
The rapid transient overvoltage data acting on the GIS internal conductor and GIS.
The shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage.
The electromagnetic wave data radiated outwards by the GIS shell comprises the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave.
The transient overvoltage data acting on the GIS external primary equipment comprise polarity of the transient overvoltage, breakdown peak voltage of the transient overvoltage, breakdown peak current of the transient overvoltage and breakdown voltage change rate of the transient overvoltage.
Step S101: and classifying the VFTO measurement data and respectively setting labels, so that the fault type of the GIS can be more quickly identified through the VFTO measurement data.
Step S200: and performing dimensionality reduction on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set.
The principal component analysis method is also called principal component analysis, and aims to convert multiple indexes into a few comprehensive indexes (namely a first parameter set) by using the idea of dimension reduction, wherein the first parameter set can reflect most information of original variables, and the contained information is not repeated.
Step S300: and carrying out normalization processing on the first parameter set to obtain a second parameter set.
Normalization is a dimensionless processing means, which changes the absolute value of the physical system value into a certain relative value relationship, thereby achieving the purpose of simplifying calculation and reducing the magnitude. The collected VFTO measurement data have different units, the range of some data can be particularly large, if normalization processing is not carried out, the neural network is slow in convergence and long in training time when a neural network algorithm is adopted, in addition, the effect of the VFTO measurement data with a large data range can be large, the VFTO measurement data with a small data range can be small, and the recognition rate of a training set generated after learning training can be reduced.
Step S400: and carrying out learning training on the second parameter set by utilizing a neural network algorithm to obtain a training set.
Step S500: identifying a portion of the VFTO measurement data using the training set.
The method randomly extracts 30-40% of VFTO measurement data, and then identifies the VFTO measurement data by using a training set so as to detect whether the learning and memorizing process meets certain requirements.
Step S600: and judging whether the identification rate of the VFTO measurement data of the training set identification part is greater than or equal to 99%.
Step S601: and if the identification rate is greater than or equal to 99%, extracting the training set to establish a fingerprint database.
Step S602: and if the identification rate is less than 99%, increasing the VFTO measurement data, and returning to the step S200.
During actual application, VFTO measurement data in a GIS collected on site are identified by the fingerprint database, so that the fault type can be judged quickly and problems can be located.
Corresponding to the method for establishing a VFTO measurement data fingerprint library provided in the embodiment of the present invention, an embodiment of the present invention further provides a system for establishing a VFTO measurement data fingerprint library, and referring to fig. 2, a schematic structural diagram of the system for establishing a VFTO measurement data fingerprint library provided in the embodiment of the present invention is shown, where the system for establishing a VFTO measurement data fingerprint library includes:
the data acquisition module 1 is used for acquiring VFTO measurement data in the GIS, wherein the VFTO measurement data comprises transient recovery overvoltage data acting on a GIS inner conductor and a GIS shell, fast transient overvoltage data acting on the GIS inner conductor and the GIS shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outside the GIS shell, transient overvoltage data acting on GIS external primary equipment and noise signals.
The transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage.
The rapid transient overvoltage data acting on the GIS internal conductor and GIS.
The shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage.
The electromagnetic wave data radiated outwards by the GIS shell comprises the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave.
The transient overvoltage data acting on the GIS external primary equipment comprise polarity of the transient overvoltage, breakdown peak voltage of the transient overvoltage, breakdown peak current of the transient overvoltage and breakdown voltage change rate of the transient overvoltage.
And the data classification module 8 is used for classifying the VFTO measurement data and respectively setting labels.
And the first processing module 2 is used for performing dimension reduction processing on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set.
And the second processing module 3 is configured to perform normalization processing on the first parameter set to obtain a second parameter set.
And the third processing module 4 is configured to perform learning training on the second parameter set by using a neural network algorithm to generate a training set.
And the data identification module 5 is used for identifying part of the VFTO measurement data by using the training set.
And the judging module 6 is used for judging whether the identification rate of the VFTO measurement data of the training set identification part is greater than or equal to 99%.
And the establishing module 7 is used for extracting the training set and establishing a fingerprint database.
The relation between the functional modules in the system for establishing the fingerprint database of the VFTO measurement data provided by the embodiment of the present invention may refer to the steps in the foregoing method embodiment, and for the sake of brevity, details are not described here again.
In summary, according to the method and the system for establishing the fingerprint database of the VFTO measurement data provided by the invention, a large amount of VFTO measurement data in the GIS equipment is collected, the VFTO measurement data is processed by using a principal component analysis method, a normalization processing method and a neural network algorithm to generate the fingerprint database, and when the GIS equipment is detected on site, the detection data of the GIS on site is identified by using the fingerprint database, so that the type of the GIS fault can be quickly judged and the problem can be positioned, the maintenance time of the GIS equipment is effectively saved, and the benefit is improved. The method for establishing the fingerprint database has strong adaptability and can be used for establishing the fingerprint databases of GIS equipment with various specifications.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims (5)

1. A method for establishing a VFTO measurement data fingerprint database is characterized by comprising the following steps:
step S100: collecting VFTO measurement data in the GIS, wherein the VFTO measurement data comprise transient recovery overvoltage data acting on a GIS inner conductor and a shell, rapid transient overvoltage data acting on the GIS inner conductor and the shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outwards by the GIS shell, transient overvoltage data acting on primary equipment outside the GIS and a noise signal;
the transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage;
the rapid transient overvoltage data acting on the GIS internal conductor and the GIS internal shell comprise polarity of the rapid transient overvoltage, breakdown peak voltage of the rapid transient overvoltage, breakdown peak current of the rapid transient overvoltage and breakdown voltage change rate of the rapid transient overvoltage;
the shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage;
the electromagnetic wave data radiated outwards by the GIS shell comprise the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave;
the transient overvoltage data acting on the GIS external primary equipment comprise the polarity of the transient overvoltage, the breakdown peak voltage of the transient overvoltage, the breakdown peak current of the transient overvoltage and the breakdown voltage change rate of the transient overvoltage;
step S200: performing dimensionality reduction on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set;
step S300: normalizing the first parameter set to obtain a second parameter set;
step S400: learning and training the second parameter set by using a neural network algorithm to obtain a training set;
step S500: identifying a portion of the VFTO measurement data using the training set;
step S600: judging whether the identification rate of the VFTO measurement data of the training set identification part is greater than or equal to 99%;
step S601: and if the identification rate is greater than or equal to 99%, extracting the training set to establish a fingerprint database.
2. The VFTO measurement data fingerprinting method of claim 1, further comprising:
step S602: and if the identification rate is less than 99%, increasing the VFTO measurement data, and returning to the step S200.
3. The VFTO measurement data fingerprinting method of claim 1, further comprising:
step S101: and classifying the VFTO measurement data and respectively setting labels.
4. A fingerprint repository setup system for VFTO measurement data, comprising:
the data acquisition module is used for acquiring VFTO measurement data in the GIS, wherein the VFTO measurement data comprises transient recovery overvoltage data acting on a GIS inner conductor and a shell, fast transient overvoltage data acting on the GIS inner conductor and the shell, shell transient overvoltage data acting between the GIS shell and the ground, electromagnetic wave data radiated outwards by the GIS shell, transient overvoltage data acting on primary equipment outside the GIS and a noise signal;
the transient recovery overvoltage data acting on the GIS inner conductor and the shell comprise polarity of the transient recovery overvoltage, breakdown peak voltage of the transient recovery overvoltage, breakdown peak current of the transient recovery overvoltage and breakdown voltage change rate of the transient recovery overvoltage;
the rapid transient overvoltage data acting on the GIS internal conductor and the GIS internal shell comprise polarity of the rapid transient overvoltage, breakdown peak voltage of the rapid transient overvoltage, breakdown peak current of the rapid transient overvoltage and breakdown voltage change rate of the rapid transient overvoltage;
the shell transient overvoltage data acting between the GIS shell and the ground comprise the polarity of the shell transient overvoltage, the breakdown peak voltage of the shell transient overvoltage, the breakdown peak current of the shell transient overvoltage and the breakdown voltage change rate of the shell transient overvoltage;
the electromagnetic wave data radiated outwards by the GIS shell comprise the polarity of the electromagnetic wave, the breakdown peak voltage of the electromagnetic wave, the breakdown peak current of the electromagnetic wave and the breakdown voltage change rate of the electromagnetic wave;
the transient overvoltage data acting on the GIS external primary equipment comprise the polarity of the transient overvoltage, the breakdown peak voltage of the transient overvoltage, the breakdown peak current of the transient overvoltage and the breakdown voltage change rate of the transient overvoltage;
the first processing module is used for performing dimensionality reduction processing on the VFTO measurement data by using a principal component analysis method to obtain a first parameter set;
the second processing module is used for carrying out normalization processing on the first parameter set to obtain a second parameter set;
the third processing module is used for performing learning training on the second parameter set by utilizing a neural network algorithm to generate a training set;
a data identification module for identifying a portion of the VFTO measurement data using the training set;
the judging module is used for judging whether the recognition rate of the VFTO measurement data of the training set recognition part is greater than or equal to 99%;
and the establishing module is used for extracting the training set and establishing a fingerprint database.
5. The VFTO measurement data fingerprinting system of claim 4, further comprising:
and the data classification module is used for classifying the VFTO measurement data and respectively setting labels.
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