CN102981103A - Method for positioning closed-loop network faults through fault signal self-synchronization - Google Patents

Method for positioning closed-loop network faults through fault signal self-synchronization Download PDF

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CN102981103A
CN102981103A CN2012104697947A CN201210469794A CN102981103A CN 102981103 A CN102981103 A CN 102981103A CN 2012104697947 A CN2012104697947 A CN 2012104697947A CN 201210469794 A CN201210469794 A CN 201210469794A CN 102981103 A CN102981103 A CN 102981103A
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fault
phase
current
feed line
automatization terminal
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徐丙垠
王敬华
王亮
由伟翰
常勇
耿海涛
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SHANDONG KEHUI ELECTRIC CO Ltd
Shandong University of Technology
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SHANDONG KEHUI ELECTRIC CO Ltd
Shandong University of Technology
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Abstract

The invention discloses a method for positioning closed-loop network faults through fault signal self-synchronization. According to the method, a phase current break variable start algorithm is used for determining the starting time of fault current signals, and initial phases of fault current are used for determining fault sections. The method is characterized in that the starting time of fault current signals provides a unified time reference for feeder terminal units (FTU) at different positions of a closed-loop network, the FTU adopts high-speed data collection, and according to the step of using of initial phases of fault current to determining fault sections, fault sections are judged through comparison of phase differences delta theta 1 of initial phases of fault current measured by two adjacent FTUs. The method has the advantages that voltage signals are not required to be measured, no special time synchronization device is required to be used, communication channels do not take the usual high-precision time synchronization task any more and the like.

Description

Utilize the fault-signal motor synchronizing to realize the method for closed loop net localization of fault
Technical field
A kind of method of utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault.Relate to fault self-recovery control method in the distribution closed loop net electric power system, belong to power system automatic field.
Background technology
At present, the ring network power supply pattern of two ends power supply is generally adopted in the city, down town, can in several seconds, realize turning confession during line failure, but for some responsive especially loads, such as SIC (semiconductor integrated circuit) manufacturing plant, the stadiums of important race are arranged, even if having a power failure in short-term of several seconds also can cause serious economic loss and the confusion of civil order, this just needs to adopt the operation with closed ring mode to power.The cable ring-system of operation with closed ring (interconnection switch is in co-bit when normally moving), the power supply of both sides is taken from same bus, to avoid because of the unmanageable problem of the inconsistent trend of bringing of both sides supply voltage.The looped network cabinet wire switch adopts the isolating switch that can interdict fault current; application is based on the network protection of distributed intelligence control; direct tripping fault section both sides isolating switch excision fault makes non-fault section user's power supply unaffected when line fault, realizes seamless self-healing.
When the closed loop electric power system breaks down; because all there is power supply in the both sides, trouble spot; thereby the feed line automatization terminal FTU of both sides, trouble spot can detect fault current; generally do not have voltage transformer pt in the ring main unit, can't adopt traditional direction protection, can only utilize non-passing through property of fault section electric current; direction of current is consistent; and the fault section electric current is injected by both sides, and the principle of opposite direction realizes localization of fault.And whether the feed line automatization terminal FTU direction of current that detects the different location consistent, needs a unified time reference, the network that generally adopts at present to the time can't meet the demands.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the problem that prior art exists, a kind of measurement voltage signal that do not need is provided, also need not to use special-purpose time synchronism equipment, communication port no longer carry at ordinary times high precision to the time the fault-signal motor synchronizing that utilizes of synchronous task realize the method for closed loop net localization of fault.
The technical solution adopted for the present invention to solve the technical problems is: this utilizes the fault-signal motor synchronizing to realize the method for closed loop net localization of fault, utilize the difference of phase currents starting algorithm to determine the initial time of fault current signal, utilize the initial phase of fault current to determine fault section, it is characterized in that: the initial time of described fault current signal provides unified time reference for the feed line automatization terminal FTU that is in closed looped network different location, and feed line automatization terminal FTU adopts high-speed data acquisition; The described initial phase of fault current that utilizes is determined fault section, is the phase difference θ of the initial phase of the fault current that measures by two adjacent feed line automatization terminal FTU relatively 1The failure judgement section.
Described current and phase difference Δ θ because getting access to by measurement 1Certain error is arranged, set current and phase difference Δ θ 1The permission maximum error is Then the phase differential of fault section is 180 °+φ m＞φ＞180 °-φ mThe phase differential of non-fault section is Wherein The fault current phase differential that detects for adjacent FTU on the circuit,
Figure BDA00002425635600024
Be the phase differential limits of error,
Figure BDA00002425635600025
The sample rate of described feed line automatization terminal FTU high-speed data acquisition is that every cycle is greater than 64 points.
This utilizes the fault-signal motor synchronizing to realize the method for closed loop net localization of fault, and concrete steps are as follows:
Step 1: logic flow begins;
Step 2: detect jump-value of current, whether the Sudden Changing Rate of Real-Time Monitoring phase current surpasses setting value;
Step 3: receive fault data;
Step 4: the delay judgement fault, if difference of phase currents surpasses setting value, setting value is got 1A, namely 20% of current flow ratings 5A; For guaranteeing to collect complete data, need behind the delay time of 20ms, to receive fault data;
Step 5: confirm fault, surpass setting value from Sudden Changing Rate and begin to be defined as fault moment, gather the data of a cycle;
Step 6: calculate one of them feed line automatization terminal FTU fault phase, the data that collect are carried out Fourier's computing, obtain the initial phase of fault initial time, be denoted as
Figure BDA00002425635600026
Step 7: read the fault initial time initial phase of left and right sides adjacent feeders automatization terminal FTU, be denoted as respectively
Figure BDA00002425635600027
With With this feed line automatization terminal FTU's Differ from, ask for current and phase difference
Figure BDA000024256356000210
With
Figure BDA000024256356000211
Wherein n is this feed line automatization terminal FTU;
Step 8: according to phase differential
Figure BDA000024256356000212
Value failure judgement position is as 180 °+φ m＞φ＞180 °-φ mBe fault section; When Be non-fault section, wherein Be the phase differential limits of error,
Figure BDA000024256356000215
Step 9: according to the position of failure point isolated fault, restore electricity.
Principle of work
When distribution line breaks down, fault-signal arrives double-end feed automatization terminal FTU through certain circuit transmission time, feed line automatization terminal FTU detects circuit fault has occured through certain time-delay, and establishing fault-signal, to arrive the phase error that mistiming at two ends causes be Δ θ 1And arrive feed line automatization terminal FTU and feed line automatization terminal FTU detects line failure from fault-signal, and the used time of two ends may be different, and establishing the phase error that mistiming of two ends detection failure causes is Δ θ 2, as long as two ends phase place maximum error Δ θ 1max+ Δ θ 2maxIn allowed band, then behind line failure, its double-end feed automatization terminal FTU can be the reference near-synchronous constantly according to fault detect.
Compared with prior art, the beneficial effect that the method for utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault of the present invention has is: solved in the operation with closed ring power distribution network, the difficult problem that the fault current direction detects, the method does not need measurement voltage signal, also need not to use special-purpose time synchronism equipment, communication port no longer carry at ordinary times high precision to the time synchronous task, and only need the fault current data of travelling belt reference time label after fault, do not need synchronously near-synchronous after the fault when being normal.Have the advantages such as simple, that cost is low, easy to implement.
Description of drawings
Fig. 1 closed loop net of the present invention system architecture synoptic diagram.
Fig. 2 fault of the present invention and non-fault section synoptic diagram.
Fig. 3 FB(flow block) of the present invention.
Wherein: F1 trouble spot FTU feed line automatization terminal CB1, CB2 power switch
Figure BDA00002425635600031
Phase differential for circuit two ends electric current Be the phase differential limits of error.
Embodiment
Accompanying drawing 1-3 is the most preferred embodiment that utilizes the fault-signal motor synchronizing to realize the method for closed loop net localization of fault of the present invention.
As shown in Figure 1:
Closed loop net system is by power supply, power switch CB1, CB2, switch CB11, CB12, CB21, CB22, CB31, CB32, CB41, CB412, composition in 6 feed line automatization terminal FTU, 1-4 ring main unit and the cabinets.
One, the precondition of utilizing the fault-signal motor synchronizing to realize the method for closed loop net localization of fault of the present invention is:
1) distribution line is shorter, and the error that fault-signal is transferred to the circuit two ends is very little.
2) short-term road can not consider that distributed capacitance changes the problem of circuit two ends current phase.
3) Intelligent feeder line automation terminal FTU sample rate enough high (greater than every cycle 64 points).
Two, utilize the difference of phase currents starting algorithm, find the initial time of fault-signal.
As shown in Figure 1, when the F1 point broke down, each feed line automatization terminal FTU passed through jump-value of current
Figure BDA00002425635600033
The criterion detection failure, when detecting fault-signal, write down the moment that receives fault-signal, with the time reference of this moment as the fault current phase calculation, the fault current phase place that the feed line automatization terminal FTU at more adjacent ring main unit place measures is according to phase place comparative result failure judgement point position.Electric current when F1 section both sides, trouble spot feed line automatization terminal FTU measurement
Figure BDA00002425635600041
With
Figure BDA00002425635600042
Phase difference θ 1Be 180 °, the current and phase difference Δ θ that all the other section both sides feed line automatization terminal FTU measure 1When being 0 °, judging the trouble spot and be positioned near the section of F1.
Need synchronously based on fault-signal, feed line automatization terminal FTU can be when line failure the very first time detect fault-signal, so be to reflect various faults to a basic demand of starting element, and sensitivity wants high.
Difference of phase currents starts the poor Sudden Changing Rate of principle reflection single-phase current, and the difference of phase currents acquisition methods is as follows:
Figure BDA00002425635600043
Start-up criterion is: Δ I φ＞I SET
Wherein N is the power frequency sampling number;
Figure BDA00002425635600044
Be current time
Figure BDA00002425635600045
The sampled value of (A, B or C) phase current;
Figure BDA00002425635600046
Before one-period
Figure BDA00002425635600047
The current sampling data in the corresponding moment;
Figure BDA00002425635600048
Before being two cycles The current sampling data in the corresponding moment.
The characteristics that adopt difference of phase currents to start are rapid sensitives, and it is little affected by line load, so compare with the steady-state quantity startup, the Sudden Changing Rate startup has the advantage that is not subjected to the load current variable effect from principle.
The fault section criterion as shown in Figure 2,
Figure BDA000024256356000410
Phase differential for circuit two ends electric current;
Figure BDA000024256356000411
Be the phase differential limits of error, be made as 70 °.Also can be less than 70 °.Non-passing through property of fault section electric current, direction of current is consistent, and the fault section electric current is opposite by the both sides injection direction.Consider the impact of the factors such as error of current transformer, phase place leaves certain error usually
Figure BDA000024256356000412
Therefore actual criterion is as follows:
Fault section: 180 °+φ m＞φ＞180 °-φ m
Non-fault section:
Figure BDA000024256356000413
Embodiment 1
As shown in Figure 3: this utilizes the fault-signal motor synchronizing to realize the method for closed loop net localization of fault, and concrete steps are as follows:
Step 1: logic flow begins;
Step 2: detect jump-value of current, whether the Sudden Changing Rate of Real-Time Monitoring phase current surpasses setting value;
Step 3: receive fault data;
Step 4: the delay judgement fault, if difference of phase currents surpasses setting value, setting value is got 1A, namely 20% of current flow ratings 5A; For guaranteeing to collect complete data, need behind the delay time of 20ms, to receive fault data;
Step 5: confirm fault, surpass setting value from Sudden Changing Rate and begin to be defined as fault moment, gather the data of a cycle;
Step 6: calculate one of them feed line automatization terminal FTU fault phase, the data that collect are carried out Fourier's computing, obtain the initial phase of fault initial time, be denoted as
Figure BDA00002425635600051
Step 7: read the fault initial time initial phase of left and right sides adjacent feeders automatization terminal FTU, be denoted as respectively
Figure BDA00002425635600052
With
Figure BDA00002425635600053
With this feed line automatization terminal FTU's
Figure BDA00002425635600054
Differ from, ask for current and phase difference
Figure BDA00002425635600055
With
Figure BDA00002425635600056
Wherein n is this feed line automatization terminal FTU;
Step 8: according to phase differential
Figure BDA00002425635600057
Value failure judgement position is as 180 °+φ m＞φ＞180 °-φ mBe fault section; When
Figure BDA00002425635600058
Be non-fault section, wherein Be the phase differential limits of error,
Figure BDA000024256356000510
Step 9: according to the position of failure point isolated fault, restore electricity.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.

Claims (4)

1. method of utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault, utilize the difference of phase currents starting algorithm to determine the initial time of fault current signal, utilize the initial phase of fault current to determine fault section, it is characterized in that: the initial time of described fault current signal provides unified time reference for the feed line automatization terminal FTU that is in closed looped network different location, and feed line automatization terminal FTU adopts high-speed data acquisition; The described initial phase of fault current that utilizes is determined fault section, is the phase difference θ of the initial phase of the fault current that measures by two adjacent feed line automatization terminal FTU relatively 1The failure judgement section.
2. the method for utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault according to claim 1 is characterized in that: because of the current and phase difference Δ θ that gets access to by measurement 1Certain error is arranged, set current and phase difference Δ θ 1The permission maximum error is
Figure FDA00002425635500011
Then the phase differential of fault section is 180 °+φ m＞φ＞180 °-φ mThe phase differential of non-fault section is
Figure FDA00002425635500012
Wherein
Figure FDA00002425635500013
The fault current phase differential that detects for adjacent FTU on the circuit,
Figure FDA00002425635500014
Be the phase differential limits of error,
3. the method for utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault according to claim 1, it is characterized in that: the sample rate of described feed line automatization terminal FTU high-speed data acquisition is that every cycle is greater than 64 points.
4. arbitrary described method of utilizing the fault-signal motor synchronizing to realize closed loop net localization of fault according to claim 1-3, it is characterized in that: concrete steps are as follows:
Step 1: logic flow begins;
Step 2: detect jump-value of current, whether the Sudden Changing Rate of Real-Time Monitoring phase current surpasses setting value;
Step 3: receive fault data;
Step 4: the delay judgement fault, if difference of phase currents surpasses setting value, setting value is got 1A, namely 20% of current flow ratings 5A; For guaranteeing to collect complete data, need behind the delay time of 20ms, to receive fault data;
Step 5: confirm fault, surpass setting value from Sudden Changing Rate and begin to be defined as fault moment, gather the data of a cycle;
Step 6: calculate one of them feed line automatization terminal FTU fault phase, the data that collect are carried out Fourier's computing, obtain the initial phase of fault initial time, be denoted as
Figure FDA00002425635500016
Step 7: read the fault initial time initial phase of left and right sides adjacent feeders automatization terminal FTU, be denoted as respectively
Figure FDA00002425635500017
With
Figure FDA00002425635500018
With this feed line automatization terminal FTU's
Figure FDA00002425635500019
Differ from, ask for current and phase difference
Figure FDA000024256355000110
With
Figure FDA000024256355000111
Wherein n is this feed line automatization terminal FTU;
Step 8: according to phase differential
Figure FDA000024256355000112
Value failure judgement position is as 180 °+φ m＞φ＞180 °-φ mBe fault section; When
Figure FDA000024256355000113
Be non-fault section, wherein Be the phase differential limits of error,
Figure FDA000024256355000115
Step 9: according to the position of failure point isolated fault, restore electricity.
CN2012104697947A 2012-11-19 2012-11-19 Method for positioning closed-loop network faults through fault signal self-synchronization Pending CN102981103A (en)

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CN103354390A (en) * 2013-06-19 2013-10-16 国家电网公司 Distributed intelligent feed line automation control method
CN104297629A (en) * 2014-08-19 2015-01-21 中国科学院电工研究所 Method for detecting and positioning section faults of a power distribution network containing distributed generators
CN104391224A (en) * 2014-11-19 2015-03-04 国家电网公司 Power distribution network failure data self-synchronizing method based on instantaneous amplitude change
CN104698250A (en) * 2013-12-06 2015-06-10 展讯通信（上海）有限公司 Mobile terminal, current decomposing and positioning method and system thereof and current testing device
CN104917163A (en) * 2015-06-30 2015-09-16 国网上海市电力公司 Warehouse-connected cable ring network over-current fault position determining equipment
CN104953562A (en) * 2014-03-31 2015-09-30 国网上海市电力公司 Single-ring network tie-line three-power supply structure feeder automatic protection method
CN105004947A (en) * 2015-07-02 2015-10-28 广东电网有限责任公司电力科学研究院 Alternating current ring network state monitoring method and system
CN105021942A (en) * 2015-07-02 2015-11-04 广东电网有限责任公司电力科学研究院 Fault detection method and system for zero-line butt-joint ring network
CN105067959A (en) * 2015-09-15 2015-11-18 长沙威胜信息技术有限公司 Fault positioning method under ring network power supply condition
CN106610448A (en) * 2016-12-15 2017-05-03 国网江苏省电力公司南京供电公司 Adaptive overcurrent fault positioning method based on technology of STU recognition network topology
CN106997020A (en) * 2017-03-20 2017-08-01 中国石油大学(华东) A kind of cable distributor track network fault positioning method based on forward-order current fault component phase bit comparison
CN107947136A (en) * 2017-12-15 2018-04-20 贵州电网有限责任公司 A kind of Distribution Network Failure fast positioning cutting method and system based on fault vector
CN108548987A (en) * 2017-10-31 2018-09-18 国网江苏省电力公司扬州供电公司 Active power distribution network Fault Locating Method based on current phase variation
RU2740360C1 (en) * 2020-06-25 2021-01-13 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Method for time synchronization of devices of protective relay using emergency mode parameters
CN114465236A (en) * 2022-04-11 2022-05-10 赫兹曼电力（广东）有限公司 Self-healing method for power distribution network to cope with ground fault and power distribution network

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CN103354390A (en) * 2013-06-19 2013-10-16 国家电网公司 Distributed intelligent feed line automation control method
CN103354390B (en) * 2013-06-19 2015-12-02 国家电网公司 Distributed intelligence feeder automation control method
CN104698250A (en) * 2013-12-06 2015-06-10 展讯通信（上海）有限公司 Mobile terminal, current decomposing and positioning method and system thereof and current testing device
CN104953562A (en) * 2014-03-31 2015-09-30 国网上海市电力公司 Single-ring network tie-line three-power supply structure feeder automatic protection method
CN104297629A (en) * 2014-08-19 2015-01-21 中国科学院电工研究所 Method for detecting and positioning section faults of a power distribution network containing distributed generators
CN104391224B (en) * 2014-11-19 2017-12-08 国家电网公司 A kind of distribution network failure data motor synchronizing method based on instantaneous amplitude change
CN104391224A (en) * 2014-11-19 2015-03-04 国家电网公司 Power distribution network failure data self-synchronizing method based on instantaneous amplitude change
CN104917163A (en) * 2015-06-30 2015-09-16 国网上海市电力公司 Warehouse-connected cable ring network over-current fault position determining equipment
CN105021942A (en) * 2015-07-02 2015-11-04 广东电网有限责任公司电力科学研究院 Fault detection method and system for zero-line butt-joint ring network
CN105004947A (en) * 2015-07-02 2015-10-28 广东电网有限责任公司电力科学研究院 Alternating current ring network state monitoring method and system
CN105021942B (en) * 2015-07-02 2017-09-22 广东电网有限责任公司电力科学研究院 A kind of zero line docking looped network fault detection method and system
CN105004947B (en) * 2015-07-02 2017-11-10 广东电网有限责任公司电力科学研究院 One kind exchange looped network state monitoring method and system
CN105067959A (en) * 2015-09-15 2015-11-18 长沙威胜信息技术有限公司 Fault positioning method under ring network power supply condition
CN105067959B (en) * 2015-09-15 2017-11-28 长沙威胜信息技术有限公司 Fault Locating Method under the conditions of ring network power supply
CN106610448A (en) * 2016-12-15 2017-05-03 国网江苏省电力公司南京供电公司 Adaptive overcurrent fault positioning method based on technology of STU recognition network topology
CN106997020A (en) * 2017-03-20 2017-08-01 中国石油大学(华东) A kind of cable distributor track network fault positioning method based on forward-order current fault component phase bit comparison
CN106997020B (en) * 2017-03-20 2020-01-07 中国石油大学(华东) Cable distribution looped network fault positioning method based on positive sequence current fault component phase comparison
CN108548987A (en) * 2017-10-31 2018-09-18 国网江苏省电力公司扬州供电公司 Active power distribution network Fault Locating Method based on current phase variation
CN107947136A (en) * 2017-12-15 2018-04-20 贵州电网有限责任公司 A kind of Distribution Network Failure fast positioning cutting method and system based on fault vector
RU2740360C1 (en) * 2020-06-25 2021-01-13 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Method for time synchronization of devices of protective relay using emergency mode parameters
CN114465236A (en) * 2022-04-11 2022-05-10 赫兹曼电力（广东）有限公司 Self-healing method for power distribution network to cope with ground fault and power distribution network

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