CN104360228B - Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements - Google Patents
Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements Download PDFInfo
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- CN104360228B CN104360228B CN201410638664.0A CN201410638664A CN104360228B CN 104360228 B CN104360228 B CN 104360228B CN 201410638664 A CN201410638664 A CN 201410638664A CN 104360228 B CN104360228 B CN 104360228B
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- fault
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
Abstract
The invention discloses a method for improving positioning of a fault section of a power distribution network including a distributed power supply through directional elements. The method comprises the steps that (1) after the power distribution network including the distributed power supply breaks down, whether a fault occurs in an area with a T joint or an area without a T joint is judged according to the direction of fault current reported by switches around a fault point; (2) if the direction information of the fault reported by the directional element on the side with the fault current supplied by a main power supply is in the positive direction, and the direction information of the fault reported by the directional element on the side with the fault current supplied by the distributed power supply is in the negative direction, it is accordingly judged that the fault occurs in the area with the T joint, and thus the fault isolation is conducted; (3) if the direction information of the fault current provided by feeder line switches around the fault point is identical, it is judged that the fault occurs in area without the T joint. The amplitude values of the fault current of the switches on the two sides of the fault point are different, the fault current crossing the switches on the same side of the fault point is approximately identical, and thus the specific area where the fault occurs can be judged and fault isolation can be conducted accordingly.
Description
Technical field
The invention belongs to power system automation technology field, it is related to the fault location of power distribution network, specifically a kind of
Utilization orientation element improves the Fault Section Location of Distribution Network containing distributed power source.
Background technology
Generate electricity as representative with the various novel renewable energy such as wind energy, solar energy, biomass energy, ocean energy and underground heat
The fast development of distributed generation technology, distributed power source is linked in power distribution network in a large number, and trend distribution can occur accordingly to change,
Also by great changes will take place, this proposes new requirement to short circuit current situation during fault to system, especially in fault location
Aspect, this leads to traditional electrical power distribution network fault location method no longer applicable.In order to correct in the case of accessing in distributed power source
Carry out the fault location of power distribution network it is necessary to the new fault location scheme of research, with the access eliminating distributed power source, fault is determined
The impact that bit strip comes.
The feature of the short circuit current being provided according to distributed power source, the present invention proposes a kind of fault location scheme, can make to contain
The power distribution network of distributed power source rapidly and accurately finds fault zone when breaking down, and fault zone is carried out isolate and
When send repair personnel to carry out in-situ processing.This to the power off time of the fault section that restores electricity, shortens and promotes distributed
The development and application of electricity has highly important meaning.
Content of the invention
The purpose of the present invention is that existing distribution network failure section location technology is improved, and proposes one kind containing distributed
Electrical power distribution net fault section location method, when solving the distribution network failure containing distributed power source, is provided by distributed power source
The impact that short circuit current positions to distribution network failure.
The technical scheme is that and be achieved in that, a kind of utilization orientation element improves the power distribution network containing distributed power source
Fault section location method is it is characterised in that comprise the following steps：
Step 1：After power distribution network containing distributed power source breaks down, according to switching the fault current reporting around trouble point
Direction, the big region (abbreviation fault zone) that failure judgement occurs is that T connects region or other regions connecing without T；
Step 2：If being positive direction by the directional element reporting fault directional information that main power source provides fault current side, and
It is opposite direction by the directional element reporting fault directional information that distributed power source provides fault current side, failure judgement is sent out accordingly
Life connects region in T, thus isolated fault；
Step 3：If the fault current directional information that the feeder switch around trouble point provides is identical, failure judgement occurs
In other regions connecing without T；Due to providing the power supply flowing through trouble point both sides switch fault electric current different, then trouble point both sides
The fault current amplitudes of switch experience are different, and the fault current size of the switch experience of trouble point side is approximately the same, accordingly
May determine that the concrete section of generation of being out of order and carry out Fault Isolation；
Step 4：If failure judgement region is free from other regions that T connects, under extreme case, trouble point both sides switch experience
Fault current may identical it is impossible to determine specific fault zone；Now, by transformer station's wire-outgoing breaker overcurrent protection action
Tripping operation, the DG on this feeder line after 2s all departs from from electrical network, carries out through 2.5～3.5s time delay after transformer station's wire-outgoing breaker tripping operation
Overlap, if transient fault, recover full feeder line and power；If permanent fault, then transformer station's wire-outgoing breaker trips again,
Now the fault message at feeder switch eliminates the impact of DG, can rely on conventional failure locating rule according to fault current
Carry out gamut fault location and carry out Fault Isolation.
Further, in described method, in step 1, at the feeder switch that T connects around region, install directional element additional, and
Specify that the short circuit current direction that provided by main power source is positive direction, T connects the feeder switch that region non-faulty current flows through and do not consider
The information of its directional element, is only judged using the directional information of other two feeder switches.
Further, in described method, in step 2, if region is connect for T according to directional element failure judgement region, should
Region is corresponding fault section；If fault occurs in the region connecing without T, according to switch experience fault each in this region
The concrete section that the size failure judgement of electric current occurs.
Further, in methods described, in step 4, transformer station's wire-outgoing breaker possesses overcurrent protection and once quickly overlaps
Lock function, reclosing delay time is 2.5～3.5s；Specified according to Q/GDW480-2010, the DG unintentionally knowing isolated island must be
Depart from from electrical network in 2s after feeder fault.
It is an advantage of the current invention that：(1) consider the impact to fault location for the fault current that distributed power source provides, right
Distribution network failure containing distributed power source is accurately positioned；(2) carry out fault using existing fault message at each switch fixed
Position, reduces investment.
Brief description
Figure 1A connects area schematic for T.
Figure 1B connects fault current directional diagram when region T2 breaks down for T.
Fig. 2 is fault current directional diagram when breaking down without other regions A6 that T connects.
In figure, dashed circle region T1, T2, T3, T4 connect region for T, and region A1, A2, A3 ... A13 connects without T
Other regions.S1 is transformer station's outlet switch, and D1, D2 are DG outlet switch, and A, B, C ... S is feeder line section switch, square generation
Table breaker.Block switch B, C, L, E, F, O, P, Q, R, I, J and breaker D2 need to install directional element additional, and K1, K2 are trouble point
Mark, the direction of arrow is current direction during fault.
Specific embodiment
Below with reference to accompanying drawing and example, the present invention will be further described.
Embodiment 1
As shown in Figure 1B, K1 point is short-circuited fault, occurs position to connect region T2 region in T, fault current direction is as schemed
Shown.If all collecting fault at feeder switch S1, A, B, C, D, E, D1, Q, P, O, D2, F, G, H, I to cross stream information, due to
Feeder switch E, F, O around T2 region is provided with directional element, short circuit current at feeder switch EThere is provided by main power source, be
Positive direction fault current, short circuit current at feeder switch F, OThere is provided by DG, be reverse direction failure electric current, permissible accordingly
Judge to be out of order generation in T2 region.
Embodiment 2
, there is position in other regions A6 region connecing without T in the fault as shown in Fig. 2 K2 point is short-circuited.
Step 1：If feeder switch S1, A, B, C, D, E, D1, Q, P, O, F, G, D2, I, H all collect fault excessively stream letter
Breath, is now out of order generation in other regions connecing without T according only to fault current walking direction.
Step 2：The fault current amplitudes that feeder switch C, D, E, F, G, H, the I in other regions connecing without T are collected
Size is compared, it is possible to find flow through the fault current of feeder switch F, GFlow through the fault electricity of feeder switch H, I
StreamAnd flow through the electric current of trouble point both sides feeder switch G, HAnd both differ by more than setting nargin
(considering that the composition error that progress of disease error, the sampling of protection and the calculation error of current transformer are brought obtains), so that it is determined that
Fault section is the region A6 between feeder switch G, H, completes fault location.
Claims (3)
1. a kind of utilization orientation element improves the Fault Section Location of Distribution Network containing distributed power source it is characterised in that wrapping
Include following steps：
Step 1：After power distribution network containing distributed power source breaks down, switch, according to around trouble point, the fault current side reporting
To the big region that failure judgement occurs is that T connects region or without other regions that T connects, and connects the feeder switch around region in T
Place installs directional element additional, and specifies that the short circuit current direction being provided by main power source is positive direction, and T connects region non-faulty current and flows through
Feeder switch do not consider the information of its directional element, only judged using the directional information of other two feeder switches；
Step 2：If by main power source provide fault current side directional element reporting fault directional information be positive direction, and by point
It is opposite direction that cloth power supply provides the directional element reporting fault directional information of fault current side, can determine whether that fault occurs accordingly
Connect region in T, thus isolated fault, install directional element additional at the feeder switch that T connects around region, and specify to be carried by main power source
For short circuit current direction be positive direction, T connects the letter that the feeder switch that region non-faulty current flows through does not consider its directional element
Breath, is only judged using the directional information of other two feeder switches；
Step 3：If the fault current directional information that the feeder switch around trouble point provides is identical, failure judgement occurs not
Other regions connecing containing T；Due to providing the power supply flowing through trouble point both sides switch fault electric current different, then trouble point both sides switch
The fault current amplitudes of experience are different, and the fault current size of the switch experience of trouble point side is approximately the same, permissible accordingly
Judge to be out of order the concrete section of generation and carry out Fault Isolation；
Step 4：If failure judgement region is free from other regions that T connects, under extreme case, the event of trouble point both sides switch experience
Barrier electric current may identical it is impossible to determine specific fault zone；Now, jumped by transformer station's wire-outgoing breaker overcurrent protection action
Lock, the DG on this feeder line after 2s all departs from from electrical network, carries out weight through 2.5～3.5s time delay after transformer station's wire-outgoing breaker tripping operation
Close, if transient fault, recover full feeder line and power；If permanent fault, then transformer station's wire-outgoing breaker trips again, this
When feeder switch at fault message eliminate the impact of DG, according to fault current, rely on conventional failure locating rule to carry out entirely
Scope fault location simultaneously carries out Fault Isolation.
2. method according to claim 1 is it is characterised in that in step 2, if according to directional element failure judgement region being
T connects region, then this region is corresponding fault section；If fault occurs in the region connecing without T, according to each in this region
The concrete section that the size failure judgement of switch experience fault current occurs.
3. method according to claim 1 is it is characterised in that in step 4, transformer station's wire-outgoing breaker possesses overcurrent protection
With a high-speed reclosure function, reclosing delay time is 2.5～3.5s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410638664.0A CN104360228B (en) | 2014-11-07 | 2014-11-07 | Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements |
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| CN201410638664.0A CN104360228B (en) | 2014-11-07 | 2014-11-07 | Method for improving positioning of fault section of power distribution network including distributed power supply through directional elements |
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| CN104360228A CN104360228A (en) | 2015-02-18 |
| CN104360228B true CN104360228B (en) | 2017-02-22 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820163A (en) * | 2015-04-13 | 2015-08-05 | 同济大学 | FTU-based power distribution network fault positioning method |
| CN105391037B (en) * | 2015-12-01 | 2018-10-26 | 江苏省电力公司淮安供电公司 | More feeder line radiant type power distribution networks access the fault section diagnostic method of multiple distributed generation resources |
| CN105759173B (en) * | 2016-03-31 | 2018-05-08 | 中国科学院电工研究所 | The adaptive failure Section Location of power distribution network containing distributed generation resource |
| CN106291240B (en) * | 2016-08-08 | 2017-09-29 | 上海金智晟东电力科技有限公司 | The electrical power distribution network fault location method that Same Name of Ends attribute is checked |
| CN107064736B (en) * | 2017-03-22 | 2019-04-09 | 华南理工大学 | A kind of Fault Locating Method connecing inverse distributed power power distribution network containing more T |
| US10483754B2 (en) * | 2017-05-01 | 2019-11-19 | Abb Schweiz Ag | Fault detection and location in nested microgrids |
| CN108037414B (en) * | 2017-12-11 | 2019-07-12 | 福州大学 | A kind of electrical power distribution network fault location method based on hierarchical mode and intelligent checking algorithm |
| US11831158B2 (en) | 2018-01-31 | 2023-11-28 | Siemens Aktiengesellschaft | Power grid fault detection method and device with distributed energy resource |
| CN109655709A (en) * | 2018-10-19 | 2019-04-19 | 南京海兴电网技术有限公司 | A kind of Fault Locating Method based on distributed feeder automation |
| CN110542827B (en) * | 2019-01-31 | 2020-08-07 | 华北电力大学 | Method and system for judging fault direction of power distribution network containing inverter type power supply |
| CN109946567B (en) * | 2019-04-01 | 2020-12-18 | 石家庄科林电气股份有限公司 | Distributed intelligent FA fault positioning method based on direction identification |
| CN109839575B (en) * | 2019-04-04 | 2021-07-06 | 国家电网有限公司 | Power system fault processing method and device and terminal equipment |
| CN110850236A (en) * | 2019-11-28 | 2020-02-28 | 国网福建省电力有限公司厦门供电公司 | Power distribution network fault positioning method based on parameter estimation |
| CN111948490B (en) * | 2020-08-05 | 2023-01-10 | 汪子岩 | Fault positioning and processing method for active power distribution network |
| CN113013880A (en) * | 2021-04-20 | 2021-06-22 | 西安兴汇电力科技有限公司 | Fault processing method based on 5G communication module distribution line |
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| CN102253314B (en) * | 2011-06-23 | 2013-08-28 | 陕西电力科学研究院 | Superheat region searching method for fault location of electric distribution network |
| CN103048587B (en) * | 2012-12-12 | 2016-01-20 | 深圳供电局有限公司 | There is the Fault Locating Method of the power distribution network of distributed power source, Apparatus and system |
| CN103513157A (en) * | 2013-08-05 | 2014-01-15 | 国家电网公司 | Fault locating method of smart power distribution network in distribution line multi-power-supply-point environment |
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