CN109959844A - A kind of judgment method and device in the distribution network failure direction containing distributed generation resource - Google Patents
A kind of judgment method and device in the distribution network failure direction containing distributed generation resource Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- 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
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Abstract
The judgment method and device in the invention proposes a kind of distribution network failure direction containing distributed generation resource, the following steps are included: S100) monitoring current is sampled with the first sample frequency within the sampling time, it calculates current period and the previous period respectively samples the corresponding monitoring current of point moment, and calculate the phase angle change sequence of each sampled point of current period monitoring current sampled point corresponding with the monitoring current in previous periodWherein n is current sampling point and n is the positive integer greater than 1；S200) according to the phase angle changeDetermine the monitoring current phase change sequence that directional element finally usesWherein Δ δ (n) is describedReverse sequence；S300 the value of current Δ g (n)) is obtained; and count duration of all Δ g (n) in scope of statistics; and when Δ g (n)≤- 30 ° of duration being more than or equal to 20ms, determine that failure occurs in protection installation place downstream；When the duration of Δ g (n) >=30 ° being more than or equal to 20ms, determine that failure occurs in protection installation place upstream.
Description
Technical field
The present invention relates to circuit protection technical field, in particular to a kind of distribution network failure direction containing distributed generation resource
Judgment method and device.
Background technique
With renewable energy be main Land use systems distributed power generation for solving China increasingly serious energy and ring
Border problem has important strategy function.Currently, distributed generation resource (DG) is accessed close to distribution load centre mostly, in this way
On the one hand doing can play the role of reducing investment outlay, reduce network loss, improve power supply reliability；But then, the access of DG changes
Conventional electrical distribution net single supply Radial network structure is become, so that sensitivity decrease occurs in original relay protection, or even has occurred
Tripping and nonaction, it is therefore necessary to which research is suitable for the distribution protection method containing distributed generation resource.
The existing distribution network failure direction determination process containing distributed generation resource is to utilize the phase of forward-order current before and after failure
Angle change direction is only 20ms as directional element distinguishing rule, fault signature duration, but in real protection in order to
Anti- locking apparatus shake and communication delay malfunction, and fault signature electrical quantity last longer is needed just to be convenient for protection element
It is correct to open.
Summary of the invention
The present invention problem that judges time shorter lasting for fault signature of the existing technology, proposes one kind and contains
The judgment method and device in the distribution network failure direction of distributed generation resource.
Firstly, the judgment method in the invention proposes a kind of distribution network failure direction containing distributed generation resource, including it is following
Step:
S100) monitoring current is sampled with the first sample frequency within the sampling time, calculates current period and previous
A period respectively samples the corresponding monitoring current of point moment, and calculates each sampled point of current period monitoring current and previous period
The phase angle change sequence of the corresponding sampled point of monitoring currentWherein n is current sampling point and n is just whole greater than 1
Number；
S200) according to the phase angle changeDetermine the monitoring current phase change sequence that directional element finally usesWherein Δ δ (n) is describedReverse sequence；
S300 the value of current Δ g (n)) is obtained, and counts duration of all Δ g (n) in scope of statistics, and work as Δ
When g (n)≤- 30 ° of duration is more than or equal to 20ms, determine that failure occurs in protection installation place downstream；When Δ g (n) >=30 °
Duration be more than or equal to 20ms when, determine failure occur protection installation place upstream.
Further, in the above method of the invention, the monitoring current is forward-order current.
Further, in the above method of the invention, step calculates current period and the previous period respectively samples point moment
Corresponding monitoring current, including following sub-step:
The three-phase current i of point moment is respectively sampled in the acquisition route sampling timea(n), ib(n) and ic(n)；
Utilize the three-phase current and formula of each sampling point momentCalculating is respectively adopted
The monitoring current at sampling point momentWherein, α=ej120°。
Further, in the above method of the invention, formula is utilizedCalculate phase angle changeFinally obtain phase angle change sequence
Further, in the above method of the invention, after the value for getting current Δ g (n), all Δ g (n) of statistics
It is further comprising the steps of before duration in scope of statistics:
When 180 ° of Δ g (n) >, Δ g (n)=- 180 ° of Δ g (n) is enabled；When < -180 ° of Δ g (n), Δ g (n)=Δ is enabled
g(n)+180°。
Further, in the above method of the invention, the sampling time is 4 cycles and behind fault point 2 before fault point
A cycle.
Further, in the above method of the invention, the cycle is 20 milliseconds (ms).
Further, in the above method of the invention, first sample frequency is that each cycle samples 40 times.
Secondly, the present invention proposes a kind of judgment means in distribution network failure direction containing distributed generation resource, including with lower die
Block:
Computing module calculates current week for sampling with the first sample frequency to monitoring current within the sampling time
Phase and previous period respectively sample the corresponding monitoring current of point moment, and calculate each sampled point of current period monitoring current with it is previous
The phase angle change sequence of the corresponding sampled point of the monitoring current in a periodWherein n be current sampling point and n be greater than
1 positive integer；
Definition module, for according to the phase angle changeDetermine the monitoring current phase that directional element finally uses
Change sequenceWherein Δ δ (n) is describedReverse sequence；
Judgment module, for obtaining the value of current Δ g (n), and when counting lasting in scope of statistics of all Δ g (n)
Between, and when Δ g (n)≤- 30 ° of duration being more than or equal to 20ms, determine that failure occurs in protection installation place downstream；Work as Δ
When the duration of g (n) >=30 ° is more than or equal to 20ms, determine that failure occurs in protection installation place upstream.
Finally, the present invention proposes a kind of computer readable storage medium, it is stored thereon with computer instruction, which is located
Manage the step of realizing the above method when device executes.
Beneficial achievement of the invention is: by proposing above-mentioned method and device, overcoming based on current phase variation side
To method of discrimination short problem of existing fault signature time in practical applications, extend failure spy compared with the conventional method
The time is levied, the phase property duration increases to 40ms from existing 20ms, and is more applicable for the protective device based on communication.
Detailed description of the invention
Fig. 1 show a kind of judgment method first in distribution network failure direction containing distributed generation resource that the application is proposed
Embodiment flow chart；
Fig. 2 show a kind of judgment method second in distribution network failure direction containing distributed generation resource that the application is proposed
Embodiment flow chart；
Fig. 3 show a kind of judgment method third in distribution network failure direction containing distributed generation resource that the application is proposed
Embodiment flow chart；Fig. 4 show a kind of judgement side in distribution network failure direction containing distributed generation resource that the application is proposed
The system failure model containing distributed generation resource of method；
Fig. 5 show the one of the judgment method in a kind of distribution network failure direction containing distributed generation resource that the application is proposed
A system emulation figure containing distributed generation resource；
Fig. 6 show the one of the judgment method in a kind of distribution network failure direction containing distributed generation resource that the application is proposed
Forward-order current phase change figure under a different faults position；
A kind of judgment method in the distribution network failure direction containing distributed generation resource proposed described in Fig. 7 by the application changes
Forward-order current phase change figure under into rear different faults position；
It is a kind of judgment means in distribution network failure direction containing distributed generation resource for being proposed by the application described in Fig. 8
Frame diagram.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear
Chu, complete description, to be completely understood by the purpose of the present invention, scheme and effect.It should be noted that the case where not conflicting
Under, the features in the embodiments and the embodiments of the present application can be combined with each other.The identical attached drawing mark used everywhere in attached drawing
Note indicates the same or similar part.
It should be noted that unless otherwise specified, when a certain feature referred to as " fixation ", " connection " are in another feature,
It can directly fix, be connected to another feature, and can also fix, be connected to another feature indirectly.In addition, this
The descriptions such as upper and lower, left and right used in application are only the mutual alignment pass relative to each component part of the application in attached drawing
For system.In the application and the "an" of singular used in the attached claims, " described " and "the" also purport
It is including most forms, unless the context clearly indicates other meaning.
In addition, unless otherwise defined, the technology of all technical and scientific terms used herein and the art
The normally understood meaning of personnel is identical.Term used in the description is intended merely to description specific embodiment herein, without
It is to limit the application.Term as used herein "and/or" includes the arbitrary of one or more relevant listed items
Combination.
It will be appreciated that though various elements may be described in this application using term first, second, third, etc., but
These elements should not necessarily be limited by these terms.These terms are only used to for same type of element being distinguished from each other out.For example, not taking off
In the case where the application range, first element can also be referred to as second element, and similarly, second element can also be referred to as
First element.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When ".
A kind of first embodiment stream of the judgment method in the distribution network failure direction containing distributed generation resource shown in referring to Fig.1
Cheng Tu, the present invention propose a kind of judgment method in distribution network failure direction containing distributed generation resource, comprising the following steps:
S100) monitoring current is sampled with the first sample frequency within the sampling time, calculates current period and previous
A period respectively samples the corresponding monitoring current of point moment, and calculates each sampled point of current period monitoring current and previous period
The phase angle change sequence of the corresponding sampled point of monitoring currentWherein n is current sampling point and n is just whole greater than 1
Number；
S200) according to the phase angle changeDetermine the monitoring current phase change sequence that directional element finally usesWherein Δ δ (n) is describedReverse sequence；
S300 the value of current Δ g (n)) is obtained, and counts duration of all Δ g (n) in scope of statistics, and work as Δ
When g (n)≤- 30 ° of duration is more than or equal to 20ms, determine that failure occurs in protection installation place downstream；When Δ g (n) >=30 °
Duration be more than or equal to 20ms when, determine failure occur protection installation place upstream.
Further, in the above method proposed by the present invention, the monitoring current is forward-order current.
Further, a kind of distribution network failure direction containing distributed generation resource proposed referring to the application shown in Fig. 2
Judgment method flow chart of the second embodiment, in the above method proposed by the present invention, step S100 further includes following sub-step:
The three-phase current i of point moment is respectively sampled in the acquisition route sampling timea(n), ib(n) and ic(n)；
Utilize the three-phase current and formula of each sampling point momentCalculating is respectively adopted
The monitoring current at sampling point momentWherein, α=ej120°。
Further, in the above method proposed by the present invention, formula is utilizedCalculate phase angle
VariationWherein arctan is arctangent cp cp operation symbol.
Further, a kind of distribution network failure direction containing distributed generation resource proposed referring to the application shown in Fig. 3
Judgment method 3rd embodiment flow chart, in the above method proposed by the present invention, step S300 further includes following sub-step:
Preferably, the sampling time is 4 cycles and 2 cycles behind fault point before fault point.
Preferably, the cycle is 20 milliseconds (ms).
Preferably, first sample frequency is that each cycle samples 40 times.
Referring to a kind of frame diagram of the judgment means in the distribution network failure direction containing distributed generation resource shown in Fig. 8, including
With lower module:
Computing module calculates current week for sampling with the first sample frequency to monitoring current within the sampling time
Phase and previous period respectively sample the corresponding monitoring current of point moment, and calculate each sampled point of current period monitoring current with it is previous
The phase angle change sequence of the corresponding sampled point of the monitoring current in a periodWherein n is current sampling point and n is greater than 1
Positive integer；
Definition module, for according to the phase angle changeDetermine the monitoring current phase that directional element finally uses
Change sequenceWherein Δ δ (n) is describedReverse sequence；
Judgment module, for obtaining the value of current Δ g (n), and when counting lasting in scope of statistics of all Δ g (n)
Between, and when Δ g (n)≤- 30 ° of duration being more than or equal to 20ms, determine that failure occurs in protection installation place downstream；Work as Δ
When the duration of g (n) >=30 ° is more than or equal to 20ms, determine that failure occurs in protection installation place upstream.
Specifically, the monitoring current is forward-order current；
Preferably, the sampling time is 4 cycles and 2 cycles behind fault point before fault point.
Preferably, the cycle is 20 milliseconds (ms).
Preferably, first sample frequency is that each cycle samples 40 times.
When electric system is broken down, fault current only one, in various types of failures only have three-phase
Its fault current is only three-phase symmetrical when short-circuit, and the most of failures of electric system are unbalanced fault, generated failure electricity
It is also asymmetric for flowing, and causes big inconvenience to accident analysis, therefore fault current is decomposed into positive sequence, negative phase-sequence and zero sequence electricity
Stream, such positive sequence, negative-sequence current three-phase are equal in magnitude, still three-phase symmetrical, and zero-sequence current is three same phases, by will not
Symmetrical fault current, which is decomposed into, to be easy to be calculated and three electric currents analyzing facilitate the accident analysis of unbalanced fault.
The appearance of positive sequence, negative phase-sequence, zero sequence is to analyze when asymmetry occur in system voltage, electric current, three-phase
Asymmetrical component resolve into symmetrical components (positive and negative sequence) and zero-sequence component in the same direction.As long as three-phase system can decomposite
Above three component (is somewhat like the synthesis and decomposition of power, but in many cases zero) numerical value of some component is.For ideal
Electric system, due to three-phase symmetrical, the numerical value of negative phase-sequence and zero-sequence component is all that zero (here it is us often to say under normal condition
Only positive-sequence component the reason of).When system breaks down, three-phase becomes asymmetric, at this moment can decomposite amplitude
Negative phase-sequence and zero-sequence component degree (sometimes only one such), therefore by detecting the two components that should not normally occur,
It can know that system is out of order when single-phase earthing (zero-sequence component) especially.
Seek positive-sequence component: following processing first made to original three-phase vectogram: A phase it is motionless, B phase turns 120 degree counterclockwise,
C phase turns 120 degree clockwise, therefore obtains new vectogram.This vectogram three-phase is added and is taken three point one according to the above method, this
The A phase for just obtaining positive sequence draws B, C two-phase by 120 degree of difference of method with the amplitude of A phase vector respectively.This has just been obtained just
Order components.
Fault direction discrimination principles based on current phase variation are as shown in figure 4, for containing system power supply and dividing in figure
The protection circuit of cloth power supply is divided into two protection sections of AB and BC.For protecting installation place B, electric current positive direction is bus stream
To route；Failure divides table to represent its upstream and downstream fault at F1 and at F2.
Do not allow DG to system side feed power under normal conditions in the power distribution network containing distributed generation resource, then the B before failure
The electric current that place is flowed through can use following expression:
The impedance that Z is protection circuit AC sections in formula.For forward faults F2 point failure, when only considering fault current,
Z in formula2For bus A to the impedance of fault point F2.Electric current after failure at this timeAre as follows:
Similarly the electric current of B can be flowed through when upstream is broken down at proper protection installation B are as follows:
Z in formula2For the F1 impedance of bus C to fault point.
It follows that the phase change of electric current is negative when protecting installation place downstream fault from formula (3) and formula (4)；And
It is positive for the variation of upstream failure current phase.Actual track uses three-phase power transmission system, therefore forward-order current is used in protection
Phase directional reacting condition failure point whether be located in protection zone.
Above-mentioned fault direction method of discrimination is tested through grounding through arc distribution line model using as shown in Figure 5
Card.Line parameter circuit value is arranged using Bergeron model for distribution network line in figure are as follows: positive sequence impedance Z1=0.0242+j0.1622
Ω/km, positive sequence capacitive reactance ZC1=-j10M Ω/m；Zero sequence impedance Z0=0.1965+j0.3063 Ω/km, zero sequence capacitive reactance ZC0=-
j14.6MΩ/m.Wherein L2, L3, the corresponding length of L4 is respectively 10km, 20km, 10km；Corresponding bearing power is as shown in the figure.
DG power supply is connected on route 1 at C bus, protection circuit AC is divided into two sections, it is quasi- that phase is carried out respectively to upstream and downstream at protection installation B
Fault simulation indirectly, gained forward-order current change direction are as shown in Figure 4.
Although from Fig. 6 (a) and Fig. 6 (b) as can be seen that positive-negative polarity (the i.e. phase change value of forward-order current phase change
When greater than 0 be positive polarity, when less than 0 be negative polarity) can accurate response fault point occur protection installation place upstream still under
Trip, Fig. 6 (a) corresponding is that there is a situation where in protection installation place downstream, Fig. 6 (b) corresponding is that failure generation is being protected for failure
The case where installation place upstream, but the phase change polarity last time only exists the i.e. 20ms of cycle.For the intelligence based on communication
Energy distributed fault Section Location, due to starting the inconsistent and communication delay of time, it is understood that there may be fault section both ends
One end the case where fault message may be not present and other end fault characteristic value has disappeared there are fault message, it is therefore necessary to prolong
Long fault characteristic value reliably continues detection time.
The method and step proposed by the present invention for improving the power distribution network direction containing distributed generation resource is as follows:
(1) when various phase-to phase faults occur for distribution line, route three-phase current i is acquireda(n)、ib(n)、ic(n), wherein
N=1,2,3 ... is current sampling point；Recorder data window length is 4 cycles and 2 cycles behind fault point before fault point；One
Sampling 40 times in a cycle time, totally 6 cycle periods, n >=240；
(2) the corresponding forward-order current of each sampling point moment is calculatedAnd using formula (5) find out each sampled point with it is corresponding before
The phase difference of one cycle sampled point forward-order current:
(3) defining forward-order current phase angle change reverse sequence is
(4) the forward-order current phase change sequence Δ g (n) that directional element finally uses is defined:
In formula when Δ g (n) >=180 °, Δ g (n)=- 180 ° of Δ g (n), when Δ g (n)≤- 180 °, Δ g (n)=Δ
g(n)+180°。
(5) it can determine that failure occurs in protection installation place when Δ g (n)≤- 30 ° of duration being more than or equal to 20ms
Downstream；Conversely, can determine that failure occurs on protection installation place when the duration of Δ g (n) >=30 ° being more than or equal to 20ms
Trip.
It is shown using improved directional element detection forward-order current phase change such as Fig. 7 (a) and Fig. 7 (b) proposed in this paper,
What Fig. 7 (a) was reflected be Δ g (n)≤- 30 ° duration be more than or equal to 20ms the case where, it is corresponding be failure generation protecting
Protect installation place downstream the case where, what Fig. 7 (b) was reflected be Δ g (n) >=30 ° duration be more than or equal to 20ms the case where, it is right
What is answered is failure there is a situation where in protection installation place upstream, and as can be seen from the figure the phase property duration is from existing
20ms increases to 40ms, is conducive to the starting of fault section both ends distribution terminal and exchange trouble information.
Finally, being stored thereon with computer instruction the present invention also provides a kind of computer readable storage medium.The instruction
It is realized when being executed by processor such as the step of any one of aforementioned method.
It should be appreciated that the embodiment of the present invention can be by computer hardware, the combination of hardware and software or by depositing
The computer instruction in non-transitory computer-readable memory is stored up to be effected or carried out.Standard volume can be used in the method
Journey technology-includes that the non-transitory computer-readable storage media configured with computer program is realized in computer program,
In configured in this way storage medium make computer operated in a manner of specific and is predefined-according to describing in a particular embodiment
Method and attached drawing.Each program can be realized with the programming language of level process or object-oriented with logical with computer system
Letter.However, if desired, the program can be realized with compilation or machine language.Under any circumstance, the language can be compiling or
The language of explanation.In addition, the program can be run on the specific integrated circuit of programming for this purpose.
Further, this method can be realized in being operably coupled to suitable any kind of computing platform, including
But it is not limited to PC, mini-computer, main frame, work station, network or distributed computing environment, individual or integrated
It computer platform or is communicated with charged particle tool or other imaging devices etc..Each aspect of the present invention can be with storage
No matter machine readable code on non-transitory storage medium or equipment is moveable or is integrated to calculate and put down to realize
Platform, such as hard disk, optically read and/or write-in storage medium, RAM, ROM, so that it can be read by programmable calculator, when depositing
Storage media or equipment can be used for configuration and operation computer to execute process described herein when being read by computer.In addition,
Machine readable code, or part thereof can be transmitted by wired or wireless network.When such media include in conjunction with microprocessor or
When other data processors realize the instruction or program of steps described above, invention as described herein includes that these and other are different
The non-transitory computer-readable storage media of type.When methods and techniques according to the present invention programming, the present invention is also
Including computer itself.
This document describes embodiment of the disclosure, become known for executing optimal mode of the invention including inventor.It is readding
After having read foregoing description, the variation of these embodiments will be apparent those skilled in the art.Inventor wishes skill
Art personnel optionally use such modification, and inventor be intended to by be different from it is as specifically described herein in a manner of practice this public affairs
The embodiment opened.Therefore, through applicable legal permission, the scope of the present disclosure includes describing in this appended claims
The all modifications and equivalent of theme.In addition, the scope of the present disclosure covers any of the above-mentioned element in its all possible modification
Combination, unless herein in addition instruction or otherwise significantly with contradicted by context.
Although description of the invention is quite detailed and especially several embodiments are described, it is not
Any of these details or embodiment or any specific embodiments are intended to be limited to, but should be considered as is by reference to appended
A possibility that claim provides broad sense in view of the prior art for these claims explanation, to effectively cover the present invention
Preset range.In addition, with the foreseeable embodiment of inventor, present invention is described above, its purpose is to be provided with
Description, and those still unforeseen at present change to unsubstantiality of the invention can still represent equivalent modifications of the invention.
Claims (10)
1. a kind of judgment method in the distribution network failure direction containing distributed generation resource, which comprises the following steps:
S100) monitoring current is sampled with the first sample frequency within the sampling time, calculates current period and previous week
Phase respectively samples the corresponding monitoring current of point moment, and calculates the monitoring of current period monitoring current each sampled point and previous period
The phase angle change sequence of the corresponding sampled point of electric currentWherein n is current sampling point and n is the positive integer greater than 1；
S200) according to the phase angle changeDetermine the monitoring current phase change sequence that directional element finally usesWherein Δ δ (n) is describedReverse sequence；
S300 the value of current Δ g (n)) is obtained, and counts duration of all Δ g (n) in scope of statistics, and work as Δ g (n)
When≤- 30 ° of duration is more than or equal to 20ms, determine that failure occurs in protection installation place downstream；When holding for Δ g (n) >=30 °
When the continuous time is more than or equal to 20ms, determine that failure occurs in protection installation place upstream.
2. the method according to claim 1, wherein the monitoring current is forward-order current.
3. the method according to claim 1, wherein step calculates current period and each sampled point of previous period
Moment corresponding monitoring current, including following sub-step:
The three-phase current i of point moment is respectively sampled in the acquisition route sampling timea(n), ib(n) and ic(n)；
Utilize the three-phase current and formula of each sampling point momentCalculate each sampled point
The monitoring current at momentWherein, α=ej120°。
4. the method according to claim 1, wherein utilizing formulaCalculate phase
Angle variationFinally obtain phase angle change sequence
5. the method according to claim 1, wherein after the value for getting current Δ g (n), counting all
It is further comprising the steps of before duration of the Δ g (n) in scope of statistics:
When Δ g (n) >=180 °, Δ g (n)=- 180 ° of Δ g (n) is enabled；When < -180 ° of Δ g (n), Δ g (n)=Δ g (n) is enabled
+180°。
6. the method according to claim 1, wherein the sampling time is 4 cycles and failure before fault point
2 cycles after point.
7. according to the method described in claim 6, it is characterized in that, the cycle is 20 milliseconds (ms).
8. the method according to claim 1, wherein first sample frequency is that each cycle samples 40 times.
9. a kind of judgment means in the distribution network failure direction containing distributed generation resource, which is characterized in that comprise the following modules:
Computing module, for being sampled with the first sample frequency to monitoring current within the sampling time, calculate current period and
The previous period respectively samples the corresponding monitoring current of point moment, and calculates each sampled point of current period monitoring current and previous week
The phase angle change sequence of the corresponding sampled point of the monitoring current of phaseWherein n is current sampling point and n is greater than 1
Positive integer；
Definition module, for according to the phase angle changeDetermine the monitoring current phase change that directional element finally uses
SequenceWherein Δ δ (n) is describedReverse sequence；
Judgment module for obtaining the value of current Δ g (n), and counts duration of all Δ g (n) in scope of statistics, and
When Δ g (n)≤- 30 ° of duration being more than or equal to 20ms, determine that failure occurs in protection installation place downstream；As Δ g (n)
When >=30 ° of duration is more than or equal to 20ms, determine that failure occurs in protection installation place upstream.
10. a kind of computer readable storage medium, is stored thereon with computer instruction, it is characterised in that the instruction is held by processor
It realizes when row such as the step of method described in any item of the claim 1 to 8.
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| CN111650470A (en) * | 2020-05-21 | 2020-09-11 | 中国矿业大学(北京) | Method for rapidly and adaptively detecting and identifying faults of microgrid circuit sections |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423132A (en) * | 2001-11-28 | 2003-06-11 | 淄博科汇电气有限公司 | Small-current earth fault switch-selecting and sectioning method for power system |
| CN101387682A (en) * | 2008-10-27 | 2009-03-18 | 清华大学 | Single-phase earth fault detecting method based on residual current harmonic component |
| CN101562332A (en) * | 2009-05-27 | 2009-10-21 | 天津大学 | Self-adaptive current fast tripping protection method for distribution network comprising inverse distributed power |
| CN103048582A (en) * | 2012-12-20 | 2013-04-17 | 北京交通大学 | Distribution network single-phase earth fault line selection method based on negative sequence impedance angles |
| CN103063984A (en) * | 2012-12-20 | 2013-04-24 | 北京交通大学 | Power distribution network single-phase earth fault line selection method based on line double-terminal negative sequence current |
| CN103296643A (en) * | 2013-03-19 | 2013-09-11 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| CN103840451A (en) * | 2014-02-26 | 2014-06-04 | 珠海许继电气有限公司 | Distributed power supply island detection method based on distribution transformation high-voltage side signal correction |
| CN104054001A (en) * | 2012-01-16 | 2014-09-17 | Abb研究有限公司 | Method for identifying fault direction without voltage measurement information and directional element thereof |
| CN106532765A (en) * | 2016-10-20 | 2017-03-22 | 国网福建省电力有限公司 | Wind power generator set low voltage ride through capability testing method considering phase jump |
| CN106941252A (en) * | 2017-01-09 | 2017-07-11 | 湖南大学 | It is not required to the guard method of distribution feeder containing DG of voltage |
| CN107276043A (en) * | 2016-11-24 | 2017-10-20 | 北京交通大学 | A kind of active distribution network protection scheme based on electric current positive-sequence component phase place change |
-
2019
- 2019-01-14 CN CN201910032653.0A patent/CN109959844B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423132A (en) * | 2001-11-28 | 2003-06-11 | 淄博科汇电气有限公司 | Small-current earth fault switch-selecting and sectioning method for power system |
| CN101387682A (en) * | 2008-10-27 | 2009-03-18 | 清华大学 | Single-phase earth fault detecting method based on residual current harmonic component |
| CN101562332A (en) * | 2009-05-27 | 2009-10-21 | 天津大学 | Self-adaptive current fast tripping protection method for distribution network comprising inverse distributed power |
| CN104054001A (en) * | 2012-01-16 | 2014-09-17 | Abb研究有限公司 | Method for identifying fault direction without voltage measurement information and directional element thereof |
| CN103048582A (en) * | 2012-12-20 | 2013-04-17 | 北京交通大学 | Distribution network single-phase earth fault line selection method based on negative sequence impedance angles |
| CN103063984A (en) * | 2012-12-20 | 2013-04-24 | 北京交通大学 | Power distribution network single-phase earth fault line selection method based on line double-terminal negative sequence current |
| CN103296643A (en) * | 2013-03-19 | 2013-09-11 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| CN103840451A (en) * | 2014-02-26 | 2014-06-04 | 珠海许继电气有限公司 | Distributed power supply island detection method based on distribution transformation high-voltage side signal correction |
| CN106532765A (en) * | 2016-10-20 | 2017-03-22 | 国网福建省电力有限公司 | Wind power generator set low voltage ride through capability testing method considering phase jump |
| CN107276043A (en) * | 2016-11-24 | 2017-10-20 | 北京交通大学 | A kind of active distribution network protection scheme based on electric current positive-sequence component phase place change |
| CN106941252A (en) * | 2017-01-09 | 2017-07-11 | 湖南大学 | It is not required to the guard method of distribution feeder containing DG of voltage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650470A (en) * | 2020-05-21 | 2020-09-11 | 中国矿业大学(北京) | Method for rapidly and adaptively detecting and identifying faults of microgrid circuit sections |
| CN111650470B (en) * | 2020-05-21 | 2023-08-08 | 中国矿业大学(北京) | Rapid self-adaptive fault detection and identification method for micro-grid line section |
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