CN107402341A - A kind of HVDC transmission line Method of Traveling Wave Fault Ranging - Google Patents

A kind of HVDC transmission line Method of Traveling Wave Fault Ranging Download PDF

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Publication number
CN107402341A
CN107402341A CN201710764049.8A CN201710764049A CN107402341A CN 107402341 A CN107402341 A CN 107402341A CN 201710764049 A CN201710764049 A CN 201710764049A CN 107402341 A CN107402341 A CN 107402341A
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msub
mrow
wave
fault
ranging
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陈雷
武佩依
杨津听
鲍益波
杨彪
起如杰
隋维利
钊向飞
王鹏
马克伟
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Yunnan Hailite Electric Automation Co Ltd
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Yunnan Hailite Electric Automation Co Ltd
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    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Locating Faults (AREA)

Abstract

The present invention discloses a kind of HVDC transmission line Method of Traveling Wave Fault Ranging, it is characterised in that：1) the speed change wave property and wideband information of DC Line Fault traveling wave are analyzed；2) the change velocity of wave of wideband fault message travelling wave ranging is handled；3) the single end distance measurement algorithm based on wideband fault message Yu modular transfer time difference.The present invention efficiently solves the velocity of wave On The Choice in travelling wave ranging, improve the range accuracy of existing location algorithm, with stronger practicality and reliability, under EMTDC environment, simulation analysis are carried out by background of Tianguang HVDC system, correlated results demonstrates the validity and practicality of put forward distance-finding method.

Description

A kind of HVDC transmission line Method of Traveling Wave Fault Ranging
Technical field
The present invention relates to technical field of power systems, is specifically related to a kind of HVDC transmission line traveling wave fault location Method.
Background technology
Travelling wave ranging is the line fault location technology that HVDC transmission system generally uses, and its accuracy mainly depends on In wave head detection and the selection of traveling wave speed.With drawing for the advanced inflection point detection technology such as wavelet theory, mathematical morphology Enter, wave head detects to have obtained very big improvement；(Qin Jian, Peng Liping, the transmission line of electricity of king and Chun based on wavelet transformation technique are single-ended Traveling wave fault location [J] Automation of Electric Systems, 2005,29 (19):62-65；Shu Hongchun, Wang Chao, Zhang Jie, is waited to be based on form HVDC line faults identification and localization method research [J] Electric Power Automation Equipments, 2007,27 (4):6-9；Zhang Zhaoning, hair Roc, Yu Weiyong wait application [J] the Proceedings of the CSEEs of time series wavelet neural networks in fault localization, and 2001, 21(6):66-71；Adaptive failure distance measurement algorithm [J] electrotechnics of Li Shengfang, Fan Chunju, Yu Wei a large bell .T type branch links Journal, 2001,19 (10):59-63.) however, the traveling wave that effect of dispersion is brought, which becomes velocity of wave characteristic, causes velocity of wave select permeability always It is not well solved, causes travelling wave ranging result accuracy relatively low, to the bad adaptability of operating condition and fault condition, give The fault recovery of direct current transportation and reliability service bring challenge.(Zhai Yongchang practicalities high voltage direct current transmission line fault location side Method [J] Power System and its Automation journals, 2008,20 (5):70-73；Song Guobing, Zhou Desheng, Jiao Bin, wait a kind of straight Flow measuring distance of transmission line fault new principle [J] Automation of Electric Systems, 2007,31 (24):57-60.)
The sample rate of traveling wave ranging device can reach 1MHz at present, using the teaching of the invention it is possible to provide 0~500kHz wideband fault message.And The frequency bandwidth that existing location algorithm is utilized only has zero to tens KHzs, and substantial amounts of wideband fault message does not obtain fully Utilize.On the other hand, range unit is typically carried out distance calculation using single fixed velocity of wave at present, actually also only make use of frequency Single-frequency amount in rate information, is not accurately reflected due to traveling wave speed variation characteristic caused by effect of dispersion.
The content of the invention
For the above-mentioned problems in the prior art, there is provided a kind of HVDC transmission line traveling wave fault location side Method, by fault traveling wave become velocity of wave characteristic further investigate, analyze its between wideband fault message, fault signature in Contacting, proposing that the travelling wave ranging based on wideband fault message becomes velocity of wave processing scheme, effectively increase existing location algorithm Range accuracy, and be further combined the program with modular transfer time difference principle, it is proposed that new one-end fault is surveyed Away from algorithm.
To achieve the above object, the effect above is reached, the present invention is to be achieved through the following technical solutions：
A kind of HVDC transmission line Method of Traveling Wave Fault Ranging, it is characterised in that：Comprise the following steps：
Step 1：Analyze the speed change wave property and wideband information of DC Line Fault traveling wave；
Step 2：Base is handled the change velocity of wave of wideband fault message travelling wave ranging；
Step 3：Single end distance measurement algorithm based on wideband fault message Yu modular transfer time difference.
Preferably, change velocity of wave characteristic and wideband information of the step 1 to DC Line Fault traveling wave are analyzed, including：It is logical Cross and the failure star note spread speed analysis of effect of dispersion and fault signature are drawn to traveling wave speed impact analysis, wideband condition Under, failure velocity of wave approximate can be considered as the function of a single variable of fault distance.
Preferably, travelling wave ranging of the step 2 based on wideband fault message becomes velocity of wave processing, it is characterised in that：
1) total line length set is L；R, I is respectively the rectification side and inverter side of quality circuit；
2) trouble point is to the distance of rectification side and inverter side：Xr、Xi；t、tr、tiRespectively moment and event occur for failure At the time of hindering traveling wave to rectification and inverter side；vr、viThe velocity of wave of rectification side and inverter side, and v are reached for fault traveling waver≈f (Xr), vi≈f(Xi)=f (L-Xr), v=f (X) is the velocity of wave distance function of given straight-flow system, and its equation is：
Xr=vr(tr-t) Xi=vi(ti- t) L=Xr+Xi
Above formula is derived as：
3) t is maderAnd tiEqual to zero, two t-X are established according to above formulatCurve, as ranging datum curve, according to rectification side Two datum lines are carried out with upper and lower translation with the due in of inverter side fault traveling wave, the moment occurs for the i.e. corresponding failure of both intersection points And fault distance.
Preferably, single end distance measurement algorithm of the step 3 based on wideband fault message Yu modular transfer time difference, it is special Sign is：v1、v0And t1、t0Respectively failed row swash mould ripple and ground mould ripple reach velocity of wave and the moment of line end, by with Lower equation：
T-X is established respectivelyrCurve, the i.e. corresponding fault moment of both intersection points and abort situation.
The beneficial effects of the invention are as follows：The present invention efficiently solves the velocity of wave On The Choice in travelling wave ranging, improves existing Have the range accuracy of location algorithm, there is stronger practicality and reliability, under EMTDC environment, using Tianguang HVDC system as Background has carried out simulation analysis, and correlated results demonstrates the validity and practicality of put forward distance-finding method.
Brief description of the drawings
Fig. 1 is Two-terminal Fault Location schematic diagram described in the embodiment of the present invention 1；
Fig. 2 is the one-end fault ranging schematic diagram based on the modular transfer time difference described in the embodiment of the present invention 2；
Embodiment
With reference to specific examples below and accompanying drawing, the present invention is described in further detail, protection content of the invention It is not limited to following examples.Under the spirit and scope without departing substantially from inventive concept, those skilled in the art it is conceivable that change Change and advantage is all included in the present invention, and using appended claims as protection domain.The process of the implementation present invention, Condition, reagent, experimental method etc., it is the universal knowledege and common knowledge of this area in addition to the following content specially referred to, Content is not particularly limited in the present invention.
Embodiment 1
As shown in figure 1, the total line length set is L；R, I is respectively the rectification side and inverter side of quality circuit；Failure Point is to the distance of rectification side and inverter side：Xr、Xi；t、tr、tiRespectively the moment occurs for failure and fault traveling wave is transmitted to whole At the time of stream and inverter side；vr、viThe velocity of wave of rectification side and inverter side, and v are reached for fault traveling waver≈f(Xr), vi≈f(Xi) =f (L-Xr), v=f (X) is the velocity of wave distance function of given straight-flow system, according to velocity of wave, transmission time and fault distance three Between relation there are following equatioies to set up：
Xr=vr(tr-t) Xi=vi(ti- t) L=Xr+Xi
By above formula shift onto for：
Make trAnd tiEqual to zero, two t-X are established according to above formulatCurve, as ranging datum curve, according to rectification side and The due in of inverter side fault traveling wave carries out upper and lower translations to two datum lines, the i.e. corresponding failure of both intersection points occur the moment and Fault distance.
Under EMTDC environment, using Tianguang HVDC system as background, fault traveling wave is measured in different transition resistances every 30km Under row wave speed, and the data obtained is carried out curve fitting using Matlab, obtain total track length (0~960km) velocity of wave- Distance.The velocity of wave curve difference very little under different transition resistances is obtained, further to reduce error, the velocity of wave under 250 can be chosen Curve calculates as representative value for ranging.
The curve is substituted into following formula：
Make trAnd tiEqual to zero, two t-X are established according to above formulatCurve, as ranging datum curve, according to rectification side and The due in of inverter side fault traveling wave carries out upper and lower translations to two datum lines, the i.e. corresponding failure of both intersection points occur the moment and Fault distance.
When table 1 show the operation of Tianguang HVDC system single-stage, both-end distance measuring algorithm distance measurement result after above-mentioned processing scheme is introduced.
The single-stage operation troubles testing result of table 1
When table 2 show the bipolar operation of Tianguang HVDC system, the both-end distance measuring algorithm that introduces after velocity of wave processing scheme above Distance measurement result.In calculating, using line mould ripple velocity of wave.
The bipolar operation troubles distance measurement result of table 2
After above-mentioned velocity of wave processing scheme, the range error of two side inputs can be controlled within 300m, fully met Requirement of engineering precision.And range accuracy has good adaptability to transition resistance and fault distance so that distance measurement result can It is greatly improved by property.
Embodiment 2
As shown in Fig. 2 v1、v0And t1、t0Respectively failed row swash mould ripple and ground mould ripple reach line end velocity of wave and At the moment, pass through below equation：
T-X is established respectivelyrCurve, the i.e. corresponding fault moment of both intersection points and abort situation.
When table 3 show the bipolar operation of Tianguang HVDC system, the distance measurement result of novel single-end location algorithm.In calculating, line Mould ripple and ground mould ripple use velocity of wave-distance Curve under 250 transition resistances.
The fault localization result of the novel single-end location algorithm of table 3
From simulation result as can be seen that during close-in fault, range error is larger, and during remote failure, range error It is smaller.Therefore, when nearly rectification side (inverter side) failure, should be defined by the distance measurement result of inverter side (rectification side), rectification side is (inverse Becoming side) distance measurement result is for reference only；When close to point failure in circuit, the average value of both-end distance measuring result can use.
By the integrated treatment to both ends distance measurement result, range error can be controlled within 1km, and cause final ranging As a result there is well adapting to property to transition resistance and fault distance.Due to：1. the acquisition of rectification side and inverter side distance measurement result Only rely upon the fault message of the wave head of local terminal first；2. two station operations staffs only need to be exchanged with regard to respective distance measurement result, During in the absence of both-end pair and data transmission problems, therefore, final distance measurement result has stronger reliability.Can be with from previous analysis Find out, by introducing the velocity of wave processing scheme based on wideband information, the range accuracy of traditional both-end distance measuring algorithm has to be carried greatly very much Height, range accuracy can reach within 300m.The novel single-end location algorithm proposed, range accuracy also meet within 1km Engineering demand, and there is higher reliability.By both effective fit applications in actual DC engineering, it is remarkably improved The range accuracy of DC line fault, and its adaptability to operating condition and fault condition.
The present invention efficiently solves the velocity of wave On The Choice in travelling wave ranging, improves the ranging essence of existing location algorithm Degree, has stronger practicality and reliability, under EMTDC environment, simulation analysis has been carried out by background of Tianguang HVDC system, Correlated results demonstrates the validity and practicality of put forward distance-finding method.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one The most wide scope caused.

Claims (4)

  1. A kind of 1. HVDC transmission line Method of Traveling Wave Fault Ranging, it is characterised in that：Comprise the following steps：
    Step 1：Analyze the speed change wave property and wideband information of DC Line Fault traveling wave；
    Step 2：The change velocity of wave of wideband fault message travelling wave ranging is handled；
    Step 3：Single end distance measurement algorithm based on wideband fault message Yu modular transfer time difference.
  2. A kind of 2. HVDC transmission line Method of Traveling Wave Fault Ranging as claimed in claim 1, it is characterised in that：The step Rapid one includes：By being obtained to the failure star note spread speed analysis of effect of dispersion and fault signature to traveling wave speed impact analysis Go out, under the conditions of wideband, failure velocity of wave approximate can be considered as the function of a single variable of fault distance.
  3. A kind of 3. HVDC transmission line Method of Traveling Wave Fault Ranging as claimed in claim 1, it is characterised in that：The step Rapid two include：
    1) total line length set is L；R, I is respectively the rectification side and inverter side of quality circuit；
    2) trouble point is to the distance of rectification side and inverter side：Xr、Xi；t、tr、tiRespectively moment and failed row occur for failure Ripple is transmitted at the time of rectification and inverter side；vr、viThe velocity of wave of rectification side and inverter side, and v are reached for fault traveling waver≈f (Xr), vi≈f(Xi)=f (L-Xr), v=f (X) is the velocity of wave distance function of given straight-flow system, and its equation is：
    Xr=vr(tr-t)Xi=vi(ti- t) L=Xr+Xi
    By above formula shift onto for：
    <mrow> <mi>t</mi> <mo>=</mo> <msub> <mi>t</mi> <mi>r</mi> </msub> <mo>-</mo> <mfrac> <msub> <mi>X</mi> <mi>r</mi> </msub> <mrow> <mi>v</mi> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>=</mo> <msub> <mi>t</mi> <mi>r</mi> </msub> <mo>-</mo> <msub> <mi>f</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow>
    <mrow> <mi>t</mi> <mo>=</mo> <msub> <mi>t</mi> <mi>i</mi> </msub> <mo>-</mo> <mfrac> <mrow> <mi>L</mi> <mo>-</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> </mrow> <mrow> <mi>v</mi> <mrow> <mo>(</mo> <mi>L</mi> <mo>-</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>=</mo> <msub> <mi>t</mi> <mi>i</mi> </msub> <mo>-</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow>
    3) t is maderAnd tiEqual to zero, two t-X are established according to above formulatCurve, as ranging datum curve, according to rectification side and inverse The due in of change side fault traveling wave carries out upper and lower translations to two datum lines, and moment and event occur for the i.e. corresponding failure of both intersection points Hinder distance.
  4. A kind of 4. HVDC transmission line Method of Traveling Wave Fault Ranging as claimed in claim 1, it is characterised in that：The step In rapid three：v1、v0And t1、t0Respectively failed row swash mould ripple and ground mould ripple reach velocity of wave and the moment of line end, by with Lower equation：
    <mrow> <mi>t</mi> <mo>=</mo> <msub> <mi>t</mi> <mn>1</mn> </msub> <mo>-</mo> <mfrac> <msub> <mi>X</mi> <mi>r</mi> </msub> <mrow> <msub> <mi>v</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>=</mo> <msub> <mi>t</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>f</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow>
    <mrow> <mi>t</mi> <mo>=</mo> <msub> <mi>t</mi> <mn>0</mn> </msub> <mo>-</mo> <mfrac> <msub> <mi>X</mi> <mi>r</mi> </msub> <mrow> <msub> <mi>v</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>=</mo> <msub> <mi>t</mi> <mn>0</mn> </msub> <mo>-</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> </mrow>
    T-X is established respectivelyrCurve, the i.e. corresponding fault moment of both intersection points and abort situation.
CN201710764049.8A 2017-08-30 2017-08-30 A kind of HVDC transmission line Method of Traveling Wave Fault Ranging Pending CN107402341A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109541392A (en) * 2018-10-15 2019-03-29 天津大学 A kind of one-end fault ranging method suitable for flexible HVDC transmission system
CN111308271A (en) * 2020-03-07 2020-06-19 云南电网有限责任公司 Fault distance measuring method for high-voltage direct-current transmission line
CN112485582A (en) * 2020-10-22 2021-03-12 青岛科技大学 Fault positioning method for high-voltage alternating-current transmission line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101776725A (en) * 2010-01-13 2010-07-14 上海交通大学 Fault positioning method for transmission line
CN101833058A (en) * 2010-05-28 2010-09-15 上海交通大学 Earth fault distance measurement method based on traveling wave modulus time difference

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101776725A (en) * 2010-01-13 2010-07-14 上海交通大学 Fault positioning method for transmission line
CN101833058A (en) * 2010-05-28 2010-09-15 上海交通大学 Earth fault distance measurement method based on traveling wave modulus time difference

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
徐敏等: "基于宽频信息的高压直流输电线路行波故障测距方法", 《电工技术学报》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109541392A (en) * 2018-10-15 2019-03-29 天津大学 A kind of one-end fault ranging method suitable for flexible HVDC transmission system
CN111308271A (en) * 2020-03-07 2020-06-19 云南电网有限责任公司 Fault distance measuring method for high-voltage direct-current transmission line
CN111308271B (en) * 2020-03-07 2022-06-17 云南电网有限责任公司 Fault distance measuring method for high-voltage direct-current transmission line
CN112485582A (en) * 2020-10-22 2021-03-12 青岛科技大学 Fault positioning method for high-voltage alternating-current transmission line

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