CN106771878B - A kind of monitoring method of wind power plant shaft tower lightning stroke drop point - Google Patents

A kind of monitoring method of wind power plant shaft tower lightning stroke drop point Download PDF

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Publication number
CN106771878B
CN106771878B CN201710017624.8A CN201710017624A CN106771878B CN 106771878 B CN106771878 B CN 106771878B CN 201710017624 A CN201710017624 A CN 201710017624A CN 106771878 B CN106771878 B CN 106771878B
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China
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shaft tower
lightning
matrix
wind power
power plant
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CN201710017624.8A
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CN106771878A (en
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孔祥启
冯江哲
岳俊红
孙浩
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Longyuan Beijing Wind Power Engineering Technology Co Ltd
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Longyuan Beijing Wind Power Engineering Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a kind of monitoring methods of wind power plant shaft tower lightning stroke drop point, comprising the following steps: S1. sets wind power plant and shares n shaft tower, and m-th of shaft tower is subject to lightning stroke, establishes the matrix A of n × n:Wherein, βmFor the diverting coefficient of m-th of shaft tower, XgiThe inductance value of lightning conducter between i-th of shaft tower and previous shaft tower or equipment;S2. matrix is setMatrixWherein, I is total lightning current instantaneous value, β1To βnRepresent the diverting coefficient of the 1st to n-th shaft tower, It1To ItnRepresent the current instantaneous value for passing through the 1st to n-th shaft tower;S3. according to A=CB‑1Matrix A is found out, it is m value that the ranks number that numerical value is 1 is found out in matrix A, is subject to m-th of shaft tower of lightning stroke to find out.The present invention can quickly and accurately look for lightning stroke drop point, eliminate failure rapidly, reduce because of economic loss caused by shutting down.

Description

A kind of monitoring method of wind power plant shaft tower lightning stroke drop point
Technical field
The present invention relates to wind power plant lightning fault monitoring technical fields, more particularly to a kind of wind power plant shaft tower lightning stroke drop point Monitoring method.
Background technique
Wind power plant generally builds the place relatively spacious in plateau, Plain, massif etc., what electrical equipment was struck by lightning Probability is much higher than general power plant.According to incompletely statistics, most wind power plant has thunder-strike phenomenon to occur, and causes blade Phenomena such as scaling loss, line tripping.It therefore, is elimination failure, it is necessary to find wind power plant route lightning stroke drop point.
Currently, the searching of existing lightning strike spot is generally found by manual type.In fault section, calm weather is right first The Grounding of shaft tower carries out the investigation of fault point, and checking the ground connection yoke plate of down conductor, whether there is or not scorification or white point phenomenons;Inspection Ground wire and shaft tower junction are looked into whether there is or not burn trace, whether there is or not the thunder-strike phenomenons such as white point;Check the distaff and UT of concrete shaft tower Whether there is or not lightning stroke white point or burn traces for wire clamp junction;Whether there is or not lightning strokes for the drift bolt bolt for checking concrete frame and the junction of ground wire Phenomena such as point, spark tracking;Insulator chain is checked whether there is or not spark tracking, whether there is or not round enamel to fall off now for porcelain insulator porcelain body As;Whether there is or not burn or stranded phenomenons for conducting wire at inspection wire clamp to damper.Fault section has wind weather, should also check shaft tower Foot nail, whether there is or not spark trackings at the bracing wire top of shaft tower and conducting wire and cross-arm at strain rod tower wire jumper, be such as described thunder Windage yaw accident has occurred when electric overvoltage.
Wind power generating set quantity is larger in wind power plant, is generally fitted in a medium-sized wind power plant dozens or even hundreds of Platform wind power generating set, the spacing between neighbouring wind generating set are generally 1 km or so, in spacious place, using frame Ceases to be busy road is in the majority, and the collection electric line outlet rod tower and contact tower of use are up to up to a hundred a, therefore, above-mentioned manually to look for lightning strike spot Although process has regulations to abide by, but troubleshooting procedure is complicated, takes time and effort, and is easy carelessness subtlety, causes to judge feelings of failing to judge by accident The generation of condition.Therefore, a kind of method that can quickly and accurately look for lightning stroke drop point is founded, failure can be quickly eliminated, to the greatest extent It is fast to restore power generation, it reduces because of economic loss caused by shutting down.
Summary of the invention
The object of the present invention is to provide a kind of monitoring methods of wind power plant shaft tower lightning stroke drop point, can quickly, accurately Lightning stroke drop point is looked on ground, eliminates failure rapidly, is reduced because of economic loss caused by shutting down, to overcome existing artificial investigation Deficiency that is time-consuming and laborious and failing to judge in the presence of erroneous judgement.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of monitoring method of wind power plant shaft tower lightning stroke drop point, comprising the following steps: S1. sets wind power plant and shares n shaft tower, M-th of shaft tower is subject to lightning stroke, establishes the matrix A of n × n:
Wherein, βmFor the diverting coefficient of m-th of shaft tower, XgiFor the lightning conducter between i-th of shaft tower and previous shaft tower or equipment Inductance value;S2. matrix is setMatrixWherein, I is total lightning current instantaneous value, β1To βnIt represents The diverting coefficient of 1st to n-th shaft tower, It1To ItnRepresent the current instantaneous value for passing through the 1st to n-th shaft tower;S3. according to A= CB-1Matrix A is found out, it is m value that the ranks number that numerical value is 1 is found out in matrix A, is subject to m-th of bar of lightning stroke to find out Tower.
As a further improvement, being passed through in the step S2 by the way that lightning current capture card is arranged on shaft tower pedestal The current instantaneous value of shaft tower.
Due to the adoption of the above technical scheme, the present invention has at least the following advantages:
The monitoring method of wind power plant shaft tower lightning stroke drop point of the invention, can quickly and accurately look for lightning stroke drop point, fast Speed eliminates failure, facilitates and carries out maintenance and restore power transmission, reduces because of economic loss caused by shutting down.
Detailed description of the invention
The above is merely an overview of the technical solutions of the present invention, in order to better understand the technical means of the present invention, below In conjunction with attached drawing, the present invention is described in further detail with specific embodiment.
Fig. 1 is the circuit diagram for calculating shaft tower diverting coefficient.
Circuit diagram when Fig. 2 is the lightning stroke of actual motion wind power plant.
Specific embodiment
The present invention will provide a kind of monitoring method of wind power plant shaft tower lightning stroke drop point, can quickly and accurately look for thunder It shoots down a little, eliminates failure rapidly, facilitate and carry out maintenance and restore power transmission, reduce because of economic loss caused by shutting down.
There is regulation in the overvoltage protection and Insulation Coordination design specification of GB T 50064-2014 alternating-current electric device: bar The instantaneous value of top of tower current potential is related with by the current instantaneous value of shaft tower, and the current instantaneous value and total lightning current for passing through shaft tower Relationship can be represented by the formula:
it=β i (1)
In formula: it--- pass through the current instantaneous value of shaft tower, unit kA;
I --- total lightning current instantaneous value, unit kA;
β --- shaft tower diverting coefficient can be calculated by the circuit of Fig. 1.
In Fig. 1, LgFor the inductance in parallel value of the adjacent shelves lightning conducter in shaft tower two sides, unit μ H.To single lightning conducter LgIt is approximately equal to 0.67l, to installation of dual lightning wires LgIt is approximately equal to 0.42l.L is span length, unit m.LtFor shaft tower inductance, unit μ H.RiFor shaft tower punching Hit ground resistance, unit Ω.
Such as taking lightning current waveform is oblique angle wave, then the lightning current wave head in shaft tower can also approximation be taken as oblique angle wave, shaft tower point Flow factor beta are as follows:
In formula: τt--- lightning current wave front time takes 2.6 μ s.
For running circuit, the inductance value L of lightning conductergIt can be obtained with empirical value, ground resistance RiWith shaft tower inductance Lt It can be obtained by test.Thus, for route in an operation, the diverting coefficient of shaft tower can also pass through above-mentioned formula (2) It obtains.
Overhead line structures as shown in Figure 2: if 2# shaft tower shown in thunder and lightning hit map 2, lightning current passes through lightning conducter and shaft tower It shunts.In Fig. 2, XgiThe inductance value of lightning conducter between i-th of shaft tower and previous shaft tower or equipment;Rti+jXtiRepresent i-th Impedance (the R of a shaft towertiFor resistance, XtiFor reactance), alphabetical j is complex symbol.According to above-mentioned formula (1), total lightning current I exists 2# shaft tower splits into β2I is split into 1# shaft tower3# shaft tower is split intoSo that
Wherein, β1、β2、β3Respectively represent the diverting coefficient of 1# shaft tower, 2# shaft tower, 3# shaft tower, It1、It2、It3It respectively represents By 1# shaft tower, 2# shaft tower, 3# shaft tower current instantaneous value.
Reasoning can be demonstrate,proved, it is assumed that share n shaft tower, m-th of shaft tower is struck by lightning, then had:
In above-mentioned formula (4), XgiThe inductance value of lightning conducter between i-th of shaft tower and previous shaft tower or equipment;βm For the diverting coefficient of m-th of shaft tower, ItmFor by the current instantaneous value of m-th of shaft tower, I is total lightning current instantaneous value, β1To βn Represent the diverting coefficient of the 1st to n-th shaft tower, It1To ItnRepresent the current instantaneous value for passing through the 1st to n-th shaft tower.
For formula (4), if matrix:
Then: A=CB-1
So, it is only necessary to matrix A is found out, the ranks number that numerical value is 1 is found out in a matrix, that is, is equal to and has found out m value, thus It rapidly finds out and is subject to m-th of shaft tower of lightning stroke.
In Matrix C, for the current instantaneous value by shaft tower, it can take and install lightning current capture card additional in the pedestal of shaft tower It obtains, when application installs lightning current capture card on 4 pedestals of each shaft tower respectively, records the electric current of 4 capture cards acquisition The sum of be used as the corresponding current instantaneous value of each shaft tower.
In conclusion the monitoring method of wind power plant shaft tower lightning stroke drop point of the present invention cooperates route using lightning current capture card Parameter, auxiliary can calculate rapidly shaft tower thunderbolt point with mathematical measure, position quick, accuracy of judgement.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, this Field technical staff makes a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all falls within this hair In bright protection scope.

Claims (2)

1. a kind of monitoring method of wind power plant shaft tower lightning stroke drop point, which comprises the following steps:
S1. it sets wind power plant and shares n shaft tower, m-th of shaft tower is subject to lightning stroke, establishes the matrix A of n × n:
Wherein, βmFor the diverting coefficient of m-th of shaft tower, XgiThe inductance of lightning conducter between i-th of shaft tower and previous shaft tower Value;
S2. matrix is setMatrix
Wherein, I is total lightning current instantaneous value, β1To βnRepresent the diverting coefficient of the 1st to n-th shaft tower, It1To ItnRepresentative passes through The current instantaneous value of 1st to n-th shaft tower;
S3. according to A=CB-1Matrix A is found out, it is m value that the ranks number that numerical value is 1 is found out in matrix A, is subject to find out M-th of shaft tower of lightning stroke.
2. a kind of monitoring method of wind power plant shaft tower lightning stroke drop point according to claim 1, which is characterized in that the step The current instantaneous value for passing through shaft tower by the way that the acquisition of lightning current capture card is arranged on shaft tower pedestal in S2.
CN201710017624.8A 2017-01-11 2017-01-11 A kind of monitoring method of wind power plant shaft tower lightning stroke drop point Expired - Fee Related CN106771878B (en)

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CN110441655B (en) * 2019-08-08 2022-08-12 中广核玉溪元江风力发电有限公司 Lightning grounding fault monitoring system for wind power plant current collecting line
CN113312682B (en) * 2021-05-06 2023-09-22 华能新能源股份有限公司 Method for calculating winding impact flashover rate of current collecting circuit by considering shielding effect of wind driven generator

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CN101820157A (en) * 2009-02-26 2010-09-01 龚良贵 Lightening arrester of transmission line
CN102156787A (en) * 2011-04-21 2011-08-17 广东电网公司佛山供电局 Lighting flashover risk evaluation model and method of regional transmission line
CN102221644A (en) * 2011-03-15 2011-10-19 珠海威瀚科技发展有限公司 System and method for online monitoring grounding networks of power stations and substations

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Publication number Priority date Publication date Assignee Title
CN101820157A (en) * 2009-02-26 2010-09-01 龚良贵 Lightening arrester of transmission line
CN102221644A (en) * 2011-03-15 2011-10-19 珠海威瀚科技发展有限公司 System and method for online monitoring grounding networks of power stations and substations
CN102156787A (en) * 2011-04-21 2011-08-17 广东电网公司佛山供电局 Lighting flashover risk evaluation model and method of regional transmission line

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