CN111123193A - Partial discharge positioning method of anti-multipath interference GIS (geographic information System) equipment - Google Patents

Partial discharge positioning method of anti-multipath interference GIS (geographic information System) equipment Download PDF

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CN111123193A
CN111123193A CN201911293673.XA CN201911293673A CN111123193A CN 111123193 A CN111123193 A CN 111123193A CN 201911293673 A CN201911293673 A CN 201911293673A CN 111123193 A CN111123193 A CN 111123193A
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partial discharge
gis
positioning
matrix
reference sensor
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史文
陈海霞
陆朱卫
杨正理
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Sanjiang University
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Sanjiang University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps

Abstract

The invention discloses a partial discharge positioning method of anti-multipath interference GIS equipment, relates to the field of GIS equipment fault diagnosis, and solves the technical problem of inaccurate positioning caused by multipath propagation of partial discharge signals in a GIS. Compared with the traditional arrival time delay positioning algorithm, the method fully considers the interference factors brought by the multipath error of the local discharge signal when the local discharge signal is transmitted in the GIS and the positioning error of different sensor positions to the accurate positioning of the local discharge source, thereby improving the positioning accuracy of the GIS local discharge source.

Description

Partial discharge positioning method of anti-multipath interference GIS (geographic information System) equipment
Technical Field
The disclosure relates to the technical field of GIS equipment fault diagnosis, in particular to a multi-path interference resistant GIS equipment partial discharge positioning method.
Background
In a modern electric power system, a GIS combined electrical apparatus provides a new solution for the construction of a power transmission and distribution station, and one GIS combined electrical apparatus can package various electrical equipment such as a circuit breaker, a disconnecting switch, a voltage transformer, a current transformer, a lightning arrester, a bus, a sleeve and the like, and the insulation distance is shortened by sulfur hexafluoride gas, so that the field is saved. GIS equipment is widely applied to power transmission and transformation equipment of various voltage classes due to the characteristics of high reliability, small occupied area, long overhaul period and the like.
Similarly, due to the totally-enclosed characteristic of the GIS equipment, the manufacturing process requirement is stricter, serious faults can be caused by tiny flaws, and the GIS equipment is integrally packaged in a sulfur hexafluoride sealed chamber and is not easy to overhaul. Therefore, the method has extremely important significance in defect positioning of the GIS equipment by an effective method. In the prior art, a fault source is positioned by a plurality of sensors distributed at different positions based on the arrival time difference of the sensors, but a fault signal can be refracted for many times in the inner wall of a GIS before reaching the sensors, so that a multipath effect error is easy to generate; meanwhile, the error conditions of time setting, time delay and the like of the sensor are considered, and a larger positioning offset error can be generated based on a traditional algorithm, so that the multipath effect and the error caused by the measurement of the sensor are effectively reduced, and the accuracy of the GIS equipment fault positioning is improved.
Disclosure of Invention
The invention provides a partial discharge positioning method of a GIS (geographic information System) device for resisting multipath interference, which achieves the technical aim of effectively reducing multipath effect to improve the fault positioning accuracy of the GIS device.
The technical purpose of the present disclosure is achieved by the following technical solutions:
a partial discharge positioning method of a GIS device for resisting multipath interference comprises the following steps:
arranging at least 3 sensors on the GIS equipment, and recording the position s of each sensoriS of said siIs the position of the ith sensor, and si＝[xi,yi]I belongs to N, and N is a positive integer greater than 2;
selecting one reference sensor s among the sensorskThe distance from the reference sensor to the partial discharge source is dkIf there is B ═ diag{d2,k,d3,k,…,dN,k}，k∈i，dN,kRepresents the nth value of the matrix B;
constructing a reference sensor s with respect to said reference sensorkC of the covariance matrix2BQB, Q is a noise vector obeying Gaussian distribution, and c is the speed of light;
constructing other sensors relative to the reference sensor skDistance matrix D and distance vector matrix Ra；
If the position of the partial discharge source is zp＝[xp,yp]Then there is said partial discharge source zpAnd the reference sensor skIs a position matrix of
Figure BDA0002319922780000021
For the zaPerforming least square estimation to obtain
Figure BDA0002319922780000022
Thereby obtaining
Figure BDA0002319922780000023
Covariance matrix of
Figure BDA0002319922780000024
According to the above
Figure BDA0002319922780000025
Obtaining the position z of the partial discharge sourcep。
Further, the
Figure BDA0002319922780000026
Further, the
Figure BDA0002319922780000027
The beneficial effect of this disclosure lies in: the method comprises the steps of firstly recording the positions of a plurality of sensors and the time delay of partial discharge signals, then constructing time delay errors and multipath effect error vector matrixes of the signal receiving process of each sensor, solving by adopting a least square method, finally obtaining the accurate position of a partial discharge source, and eliminating fuzzy position information caused by multipath effect. Compared with the traditional positioning algorithm, the method has the advantages that the interference factors caused by the internal multipath error of the GIS equipment and the error of the sensor to positioning are repeatedly considered, and the positioning performance of the local fault of the GIS equipment is greatly improved; the method is simple, low in power consumption and suitable for application of the low-power-consumption Internet of things system.
Drawings
Fig. 1 is a schematic diagram of multipath propagation of a partial discharge signal.
Detailed Description
The technical scheme of the disclosure will be described in detail with reference to the accompanying drawings.
In order to avoid the partial discharge positioning of the GIS equipment by the multipath interference, at least 3 paths of sensors are firstly arranged on the GIS equipment, and the position s of each sensor is recordedi，siI.e. the position of the ith sensor, and si＝[xi,yi]I belongs to N, and N is a positive integer greater than 2.
Then acquiring the time t of each sensor receiving partial discharge signalsiAccording to tiThe distance d from each sensor to the local discharge source can be obtainedi，di＝c×tiAnd c is the speed of light.
If the position of the partial discharge source is zp＝[xp,yp]In general, there will be di＝||si-zpIn this case, zp＝||si-diAccording to s, theniAnd diObtaining the position z of the partial discharge sourcep. However, as can be seen from the multipath propagation diagram of the partial discharge signal shown in fig. 1, the partial discharge signal does not all propagate straight to each sensor, and due to the multipath effect during the propagation of the partial discharge signal, according to c × tiD obtainediThe method has larger error with the distance from the actual sensor to the partial discharge source, and the error of the position of the partial discharge source obtained by the method is larger, so that the method has the advantages of high accuracy, high accuracy and low costThe method adopted by the disclosure is as follows:
selecting a reference sensor s among the sensorskThe distance from the reference sensor to the partial discharge source is then dkThen, there is diagonal matrix B ═ diag { d ═ d }2,k,d3,k,…,dN,k}，k∈i，dN,kRepresents the nth value of matrix B; reconstruction of reference sensor skC of the covariance matrix2BQB, Q is a noise vector obeying Gaussian distribution, and c is the speed of light. Constructing other sensors relative to a reference sensor skDistance matrix D and distance vector matrix Ra，Then
Figure BDA0002319922780000041
Figure BDA0002319922780000042
If the position of the partial discharge source is zp＝[xp,yp]Then a local discharge source zpAnd a reference sensor skIs a position matrix of
Figure BDA0002319922780000043
To zaPerforming least square estimation to obtain
Figure BDA0002319922780000044
Figure BDA0002319922780000045
Thereby obtaining
Figure BDA0002319922780000046
Covariance matrix of
Figure BDA0002319922780000047
According to
Figure BDA0002319922780000048
Obtaining the position z of the partial discharge sourcep：
Figure BDA0002319922780000049
The positioning solution set of the partial discharge source can be expressed as:
Figure BDA00023199227800000410
Figure BDA00023199227800000411
the foregoing is an exemplary embodiment of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims (3)

1. A partial discharge positioning method of a GIS device for resisting multipath interference is characterized by comprising the following steps:
arranging at least 3 sensors on the GIS equipment, and recording the position s of each sensoriS of said siIs the position of the ith sensor, and si＝[xi,yi]I belongs to N, and N is a positive integer greater than 2;
selecting one reference sensor s among the sensorskThe distance from the reference sensor to the partial discharge source is dkIf B is not diag { d ═ d2,k,d3,k,…,dN,k}，k∈i，dN,kRepresents the nth value of the matrix B;
constructing a reference sensor s with respect to said reference sensorkC of the covariance matrix2BQB, Q is a noise vector obeying Gaussian distribution, and c is the speed of light;
constructing other sensors relative to the reference sensor skDistance matrix D and distance vector matrix Ra；
If the position of the partial discharge source is zp＝[xp,yp]Then there is said partial discharge source zpAnd the reference sensor skIs a position matrix of
Figure FDA0002319922770000011
For the zaPerforming least square estimation to obtain
Figure FDA0002319922770000012
Thereby obtaining
Figure FDA0002319922770000013
Covariance matrix of
Figure FDA0002319922770000014
According to the above
Figure FDA0002319922770000015
Obtaining the position z of the partial discharge sourcep。
2. The method for anti-multipath interference GIS device local discharge location of claim 1 wherein the method is characterized in that
Figure FDA0002319922770000016
3. The method for anti-multipath interference GIS device local discharge location of claim 2 wherein the method is characterized in that
Figure FDA0002319922770000017
CN201911293673.XA 2019-12-16 2019-12-16 Partial discharge positioning method of anti-multipath interference GIS (geographic information System) equipment Pending CN111123193A (en)

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US20090274116A1 (en) * 2006-04-19 2009-11-05 Chaehwan Cho Method and system for detecting position of mobile communication terminal by using pilot strength measurement message
WO2014106414A1 (en) * 2013-01-07 2014-07-10 国家电网公司 Locating method of partial discharge source and locating system of partial discharge source
CN107843904A (en) * 2017-10-31 2018-03-27 桂林电子科技大学 A kind of code tracking loop and method for suppressing multi-path jamming
CN108008262A (en) * 2017-11-29 2018-05-08 国网上海市电力公司 A kind of shelf depreciation quick determination method
CN108181557A (en) * 2017-12-29 2018-06-19 上海交通大学 A kind of method in determining ultrahigh frequency partial discharge signal orientation
CN109814013A (en) * 2019-01-28 2019-05-28 上海交通大学 A kind of pair of shelf depreciation carries out the method and system of accurate pointing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090274116A1 (en) * 2006-04-19 2009-11-05 Chaehwan Cho Method and system for detecting position of mobile communication terminal by using pilot strength measurement message
WO2014106414A1 (en) * 2013-01-07 2014-07-10 国家电网公司 Locating method of partial discharge source and locating system of partial discharge source
CN107843904A (en) * 2017-10-31 2018-03-27 桂林电子科技大学 A kind of code tracking loop and method for suppressing multi-path jamming
CN108008262A (en) * 2017-11-29 2018-05-08 国网上海市电力公司 A kind of shelf depreciation quick determination method
CN108181557A (en) * 2017-12-29 2018-06-19 上海交通大学 A kind of method in determining ultrahigh frequency partial discharge signal orientation
CN109814013A (en) * 2019-01-28 2019-05-28 上海交通大学 A kind of pair of shelf depreciation carries out the method and system of accurate pointing

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Title
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陈江 等: "基于GSA的变压器局部放电多样本逼近定位方法", 《变压器》 *

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