CN107276043A - A kind of active distribution network protection scheme based on electric current positive-sequence component phase place change - Google Patents
A kind of active distribution network protection scheme based on electric current positive-sequence component phase place change Download PDFInfo
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- CN107276043A CN107276043A CN201611052685.XA CN201611052685A CN107276043A CN 107276043 A CN107276043 A CN 107276043A CN 201611052685 A CN201611052685 A CN 201611052685A CN 107276043 A CN107276043 A CN 107276043A
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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
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Abstract
The invention discloses a kind of active distribution network protection scheme based on electric current positive-sequence component phase place change, belong to power distribution network technical field.The protection scheme includes：Before and after collection is broken down, circuit two ends current information；Obtain electric current positive-sequence component and its phase information；Before and after by the use of failure single-ended phase change rate as protection start-up criterion, the difference changed by the use of failure rear and front end current phase as protection main criterion, if difference is in 0 between pi/2, for failure outside region；If difference is in pi/2 between π, for zone fault；When being defined as zone fault, sending action signal is protected from information processing centre to the two ends broken down, while the installation place of trip protection up and down sends block signal.The present invention is analyzed in positive sequence network, and the difference using the change of two ends current phase recognizes the possibility of internal fault external fault, reduction false protection and tripping as Protection criteria, and suitable for any fault type.
Description
Technical field
It is specifically, more particularly to a kind of to be based on electric current positive-sequence component the present invention relates to power distribution network technical field
The active distribution network protection scheme of phase place change.
Background technology
In recent years, the clean type energy is widelyd popularize with the continuous aggravation and country of energy crisis, sent out with photovoltaic
Electricity, double-fed wind generating are widely used for the inverse distributed power of representative.Distributed power source
(distributed generation, abbreviation DG) is a kind of emerging electric power energy, and many merits, energy are waited with economic and environment-friendly
People are enough met to the stable and economic and environment-friendly requirement of electric power safety.But, when a large amount of distributed power sources access power distribution network, it can lead
Cause conventional electrical distribution web frame to be powered by traditional single supply and become the network that multiterminal power supply is powered, trend is frequently shifted, its
The complexity of the method for operation can be directly influenced in selectivity and sensitivity containing DG distribution protection devices, faced protection and refused
The generation of the problems such as dynamic, malfunction.
Therefore, to meet the grid-connected requirement to protection philosophy of distribution power, domestic and foreign scholars propose the modified of many
Protection scheme and new protection philosophy, are broadly divided into following a few classes：(1) method for installing protection element additional, its core concept be
DG lines upstreams install directional current protection, and DG downstream lines adjust protection definite value.(2) method of distance protection, will contain first
Power distribution network carry out subregion, it is proposed that consider characteristic power distribution network adaptive distance protection scheme.According to system operation mode and
Power output calculates setting valve in real time.(3) adaptive guard method, according to system operation mode and network structure, to protection
Dorsal part network carries out equivalent transformations, branch road contribution factor matrix is formed, to eliminate the influence to each branch current, so as to effectively increase
The protection domain of big main protection and back-up protection.(4) method based on communication, is set using the scattered intelligence being arranged in power distribution network
The status information of standby collection each point, completes collecting and exchanging for information, the information based on multiple spot completes protection by communication network
Judge, such as multi-Agent or IED protections.
Collection voltages amount information is required in above method, but mutual induction of voltage is installed in current urban power distribution network
Device can cause cost height, engineering cumbersome, constrain popularization and application of the above method in distribution protection.
The content of the invention
In view of the foregoing, it is an object to provide a kind of active distribution based on electric current positive-sequence component phase place change
Net protection scheme, the difference changed using two ends current phase constitutes Protection criteria, it is adaptable to containing inverse distributed power
Active distribution network network, only need to extract current information, without installing voltage transformer in power distribution network, just can solve distribution
Plant-grid connection power distribution network causes the method for operation complicated and caused the problem of route protection tripping and malfunction.
To achieve these goals, the present invention uses following technical scheme：
Active distribution network protection scheme of the present invention based on electric current positive-sequence component phase place change, is set in power distribution network
There is information processing centre, comprise the following steps：
(1) before and after collection is broken down, the current information of installation place is protected at circuit two ends；
(2) the electric current positive-sequence component of current information and the phase of electric current positive-sequence component are obtained；
(3) using before and after breaking down, the difference of two ends current phase change is as Protection criteria, if two ends current phase
The difference of change is in 0 between pi/2, then is failure outside region；If two ends current phase change difference be in pi/2 to π it
Between, then it is zone fault；
(4) when being defined as zone fault, sending action signal is protected from information processing centre to two ends, it is ensured that occur
The circuit two ends protection of failure is all acted, while sending block signal to the upstream and downstream protection installation place at the two ends broken down.
It is preferred that, also include between step (2) and step (3)：
Using before and after breaking down, one-terminal current phase change rate is used as the start-up criterion of protection, analysis protection installation place
The change for the front and rear current phase difference that breaks down, if the current phase rate of change at two ends is all higher than respective startup and judges threshold
Value, then carry out step (3).
It is preferred that, in step (1), the Current Transmit installed by two ends in power distribution networkMAnd CTN, to breaking down
Before, protect installation place M and N current informationWithPreserved, while gathering the current information after breaking down
It is preferred that, in step (2), using signal delay method, obtain the electric current positive-sequence component of current informationIt is as follows：
To electric current positive-sequence componentFourier analysis is carried out, the phase of fundamental positive sequence electric current is obtained.
It is preferred that, it is used as the start-up criterion of protection, analysis protection installation place hair by the use of M ends and N-terminal current phase rate of change
The change of current phase difference before and after raw failure, if the current phase rate of change at two ends is all higher than starting judgment threshold θ 'ζ, then open
The Protection criteria at dynamic M, N two ends；
Set before and after line failure, M ends current phase rate of change isN-terminal current phase
Rate of change isWherein, t represents fault current duration, by distributed power source control strategy
Influence；
Set the startup judgment threshold θ ' of M ends protectionMζ, θ 'Mζ=σ (θmg0), wherein, θmg0To be changed by current transformer
The error angle of influence is measured with microcomputer protecting device；
Set the startup judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein, θng0To be changed by current transformer
The error angle of influence is measured with microcomputer protecting device；
As θ 'M＞ θ 'MζWith θ 'N＞ θ 'NζWhen being satisfied by, then step (3) is carried out.
Further, it is preferable to, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer Protection is filled
Put according to 50 point samplings of a cycle, error angle is 7.2 °.
Further, it is preferable to, using before and after breaking down, the difference of M ends and the change of N-terminal current phase is sentenced as protection
According to the difference θ of analysis two ends current phase changeMNChanging rule：
If the absolute value of M ends current phase change isIn formula：t1Represent hair
At the time of raw failure, T represents the time,For the M ends current phase for the previous T that breaks down,For
Break down latter T M ends current phase；
If the absolute value of N-terminal current phase change isIn formula：t1Represent hair
At the time of raw failure, T represents the time,For the N-terminal current phase for the previous T that breaks down,
For the N-terminal current phase for the latter T that break down；
Then the difference of two ends current phase change is θMN=alpha-beta；
IfIt is then the outer failure of the end regions of circuit two；
IfIt is then circuit two ends zone fault.
Compared with prior art, the present invention has advantages below and beneficial effect：
First, before and after the present invention is according to line failure, the difference of two ends current phase change is used as Protection criteria, identification
The possibility of internal fault external fault, reduction false protection and tripping；
2nd, the present invention need not obtain line voltage distribution information, it is to avoid set up voltage transformer, economy in protection installation place
It is higher；
3rd, the present invention is analyzed based on electric current positive-sequence component in positive sequence network figure, makes route protection no longer by failure
The influence of the extraneous factors such as type, DG quantity and DG capacity, strong applicability.
Brief description of the drawings
Fig. 1 is the active distribution network protection scheme preferred embodiment of the present invention based on electric current positive-sequence component phase place change
Flow chart；
Fig. 2 is the structural representation of the distribution network system containing distributed power source in the present invention；
Fig. 3 is network before line failure in the present invention；
Positive sequence additivity when Fig. 4 is circuit generation area internal fault in the present invention；
Fig. 5 is the positive sequence additivity outside circuit generation area during failure in the present invention.
Embodiment
In conjunction with accompanying drawing, the present invention will be further described in detail, in order to which the present invention is more clear and should be readily appreciated that.
Fig. 1 is the active distribution network protection scheme preferred embodiment of the present invention based on electric current positive-sequence component phase place change
Flow chart.As shown in figure 1, the protection scheme comprises the following steps：
(1) before and after collection is broken down, the current information of installation place is protected at circuit two ends；
(2) the electric current positive-sequence component of current information and the phase of electric current positive-sequence component are obtained；
(3a), using before and after breaking down, M ends and N-terminal current phase rate of change are used as the start-up criterion of protection, analysis guarantor
Shield installation place is broken down the change of front and rear current phase difference, if the current phase rate of change at two ends is all higher than respective startup
Judgment threshold, then start the main criterion of M, N two ends protection；The start-up criterion of protection is set, to prevent the small of electric current in circuit
Fluctuation causes the problem of misinformation is led, and reduces the traffic in circuit, while improving the selectivity and sensitivity of protection device；
(3b) using before and after breaking down, the difference of M ends and the change of N-terminal current phase as protection main criterion, if two
Hold the difference of current phase change to be in 0 between pi/2, be then failure outside region；If at the difference of two ends current phase change
Then it is zone fault in pi/2 between π；
(4) when being defined as zone fault, sending action signal is protected from information processing centre to two ends, two ends are protected
Shield is all acted, while sending block signal to the upstream and downstream protection installation place at the two ends broken down.
Fig. 2 is the structural representation of the distribution network system containing distributed power source in the present invention.As shown in Fig. 2 utilizing
The distribution network containing DG that MATLAB softwares are built, power distribution network reference capacity is 500MVA, and reference voltage is 10.5kV.AG and AE
It is two feeder lines drawn in power supply 10kV buses, the corresponding breaker of every circuit is QF1~QF8, and every wireline inspection is arrived
Electric current be I1~I8, the positive direction of rated current points to protected circuit for circuit two ends.Wherein, circuit AB, BC, AF are frame
Ceases to be busy road, line length is respectively 2km, 2km, 4km.Circuit CD, DE, FG are buried cable, and line length is respectively 7km,
14km, 6km.ESIt is system power supply, ZSIt is system impedance.
First, initiating line parameter, circuit AB, BC, AF select LGJ-120/25 steel-cored aluminium strands, and line parameter circuit value is χ1
=0.347 Ω/km, r1=0.27 Ω/km, circuit CD, DE, FG select YJLV22-150/60 copper core cross-linked polrvinyl chloride cables,
Line parameter circuit value is χ1=0.093 Ω/km, r1=0.259 Ω/km；
According to the Practical Project of power network, each distributed power source DG rated capacity is PDG1=2MW, PDG2=2MW, wherein
There is no DG accesses on feeder line 1, on feeder line 2, DG1 is connected at node C, and DG2 is connected at node D；
In each feed line end, access rated capacity is 1.5MVA, and power factor is 0.85 load.
Fig. 3 shows in the network before line failure, Fig. 3 that M, N are protection installation place,WithRepresent M, N
Both sides PRE-FAULT CURRENT, electric current positive direction is that node points to protected circuit,WithRespectively M sides and N side systems etc.
Imitate power supply, ZSMAnd ZSNRespectively M sides and N side system equiva lent impedances, ZlFor the line impedance between node M and node N.
Fig. 4 and Fig. 5 respectively illustrate the positive sequence additivity of failure outside in generation area and region, wherein, f represents occur
Location of fault,WithFor the fault component electric current of M, N both sides, electric current positive direction is that node points to protected circuit, ZSM1
And ZSN1Respectively M sides and the equivalent positive sequence impedance of N side systems, Zl1And Zl2The respectively circuit of node M and node N to trouble point f
Positive sequence impedance, RfFor transition resistance,For fault point voltage.
When between circuit breaker Q F5 and QF6 at the f of circuit in t1When moment breaks down, by matching somebody with somebody containing distributed power source
Current Transmit in power networkMAnd CTN, to the T for the previous period of line failure current informationWith
While gathering the current information of a period of time T after line failureWith
Using signal delay method, the electric current positive-sequence component for gathering current information is obtainedIt is as follows：
In formula,Ia、Ib、IcRespectively the three-phase current of current information, is computed：
To electric current positive-sequence componentFourier analysis is carried out, the phase of fundamental positive sequence electric current is obtained.
By the use of M ends and N-terminal current phase rate of change as the start-up criterion of protection, before analysis protection installation place is broken down
The change of current phase difference afterwards, if the current phase rate of change at two ends is all higher than respective startup judgment threshold θ 'ζ, then start
The Protection criteria at M, N two ends；
Set before and after line failure, M ends current phase rate of change isN-terminal electric current phase
Position rate of change beWherein, t represents fault current duration, and plan is controlled by distributed power source
Influence slightly；
Set the startup judgment threshold θ ' of M ends protectionMζ, θ 'Mζ=σ (θmg0), wherein, θmg0To be changed by current transformer
The error angle of influence is measured with microcomputer protecting device；
Set the startup judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein, θng0To be changed by current transformer
The error angle of influence is measured with microcomputer protecting device；
Wherein, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer protecting device is according to a week
50 point samplings of phase, error angle is 7.2 °.
As θ 'M＞ θ 'MζWith θ 'N＞ θ 'NζWhen being satisfied by, then start the main criterion of M, N two ends protection.
Using before and after breaking down, the difference of M ends and the change of N-terminal current phase is as main criterion is protected, and analysis two ends are electric
Flow the difference θ of phase place changeMNChanging rule：
If the absolute value of M ends current phase change isIn formula：t1Represent hair
At the time of raw failure, T represents the time,For the M ends current phase for the previous T that breaks down,For
Break down latter T M ends current phase；
If the absolute value of N-terminal current phase change isIn formula：t1Represent hair
At the time of raw failure, T represents the time,For the N-terminal current phase for the previous T that breaks down,
For the N-terminal current phase for the latter T that break down；
Then the difference of two ends current phase change is θMN=alpha-beta；
IfIt is then the outer failure of the end regions of circuit two, now, two ends protection is failure to actuate；
IfIt is then circuit two ends zone fault, now, protects and send from information processing centre to two ends
Actuating signal, while sending block signal to the upstream and downstream protection installation place at the two ends broken down.
Because the present invention is to be analyzed based on electric current positive-sequence component in positive sequence network figure, so route protection is applied to
Any fault type.
Three kinds of different fault types are set forth below to be explained：
Type one
When occurring singlephase earth fault in f points, it is electric current after -6.05 °, failure that protection 1, which measures PRE-FAULT CURRENT phase,
Phase is -40.86 °；Protection 2 measures fault current phase for 175.66 °, and current phase is 140.87 ° after failure；Protection 3 is surveyed
Fault current phase is -12.6 °, current phase is -49.51 ° after failure；Protection 4 measures fault current phase and is
167.42 °, current phase is 130.47 ° after failure；It is current phase after -12.6 °, failure that protection 5, which measures fault current phase,
For -64.95 °；Protection 6 measures fault current phase for 168.2 °, and current phase is -82.6 ° after failure；Protection 7 measures failure
Current phase is -33.05 °, and current phase is -80.4 ° after failure；It is 146.93 °, failure that protection 8, which measures fault current phase,
Current phase is 99.59 ° afterwards.Herein, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer Protection is filled
Put according to 50 point samplings of a cycle, error angle is 7.2 °；Fault current duration t is 12.6ms.Judge with starting
Threshold value compares, θ '5＞ θ '5ζ, θ '6＞ θ '6ζ, protection 5,6 device start-up criterions action, pi/2 ＜ θ56＜ π, protect main criterion action,
It is judged as land internal fault, 5,6 device actions are protected at two ends.
Type two
When occurring phase-to phase fault in f points, it is current phase after -6.07 °, failure that protection 1, which measures PRE-FAULT CURRENT phase,
For -41.37 °；Protection 2 measures fault current phase for 173.95 °, and current phase is 138.62 ° after failure；Protection 3 measures event
It is -12.5 ° to hinder current phase, and current phase is -48.57 ° after failure；It is 167.4 °, failure that protection 4, which measures fault current phase,
Current phase is 131.32 ° afterwards；Protection 5 measures fault current phase for -12.5 °, and current phase is -63.78 ° after failure；Protect
Shield 6 measures fault current phase for 167.5 °, and current phase is -83.1 ° after failure；Protection 7 measure fault current phase for-
33.1 °, current phase is -81.2 ° after failure；Protection 8 measures fault current phase for 146.9 °, and current phase is after failure
98.76°.Herein, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer protecting device is according to a week
50 point samplings of phase, error angle is 7.2 °；Fault current duration t is 12.6ms.Compared with starting judgment threshold, θ '5
＞ θ '5ζ, θ '6＞ θ '6ζ, protection 5,6 device start-up criterions action, pi/2 ＜ θ56＜ π, protect main criterion action, are judged as circuit
Protect 5,6 device actions in zone fault, two ends.
Type three
When occurring three-phase fault in f points, it is current phase after -6.09 °, failure that protection 1, which measures PRE-FAULT CURRENT phase,
For -42.86 °；Protection 2 measures fault current phase for 163.93 °, and current phase is 127.15 after failure；Protection 3 measures failure
Current phase is -12.7, and current phase is -47.51 ° after failure；Protection 4 measures fault current phase for 167.3 °, after failure
Current phase is 132.49 °；Protection 5 measures fault current phase for -12.7 °, and current phase is -63.76 ° after failure；Protection 6
Fault current phase is measured for 167.3 °, current phase is -86 ° after failure；Protection 7 measures fault current phase for -33.27 °,
Current phase is -83 ° after failure；Protection 8 measures fault current phase for 146.73 °, and current phase is 97 ° after failure.Herein,
Current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer protecting device according to 50 point samplings of a cycle,
Error angle is 7.2 °；Fault current duration t is 12.6ms.Compared with starting judgment threshold, θ '5＞ θ '5ζ, θ '6＞ θ
'6ζ, protection 5,6 device start-up criterions action, pi/2 ＜ θ56＜ π, protect main criterion action, are judged as land internal fault, two
5,6 device actions of end protection.
To sum up, on the basis of based on positive sequence network, using one-terminal current phase change rate as the start-up criterion of protection, with
The difference of two ends current phases change as protection main criterion, in the case where information of voltage need not be obtained, improve containing
The reliability protected in the active distribution network of distributed power source, reduces the possibility of the malfunction and movement resistance work of route protection etc.
Property, and suitable for any fault type.
More than, only the preferred embodiments of the present invention are not intended to limit the invention, and are come for those skilled in the art
Say, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, it is any modification for being made, equivalent
Replace, improve etc., it should be included in the scope of the protection.
Claims (7)
1. a kind of active distribution network protection scheme based on electric current positive-sequence component phase place change, is provided with information in power distribution network
Reason center, it is characterised in that comprise the following steps：
(1) before and after collection is broken down, the current information of installation place is protected at circuit two ends；
(2) the electric current positive-sequence component of the current information and the phase of the electric current positive-sequence component are obtained；
(3) using before and after breaking down, the difference of two ends current phase change is as Protection criteria, if two ends current phase changes
Difference be in 0 between pi/2, then be failure outside region；If the difference of two ends current phase change is in pi/2 between π,
For zone fault；
(4) when being defined as zone fault, sending action signal is protected from information processing centre to two ends, while former to occurring
The upstream and downstream protection installation place at the two ends of barrier sends block signal.
2. protection scheme according to claim 1, it is characterised in that between the step (2) and the step (3) also
Including：
Using before and after breaking down, one-terminal current phase change rate is analyzed as the start-up criterion of protection and protects installation place
The change of current phase difference before and after failure, if the current phase rate of change at two ends is all higher than respective startup judgment threshold,
Carry out the step (3).
3. protection scheme according to claim 1, it is characterised in that in the step (1), pass through two ends in power distribution network
The Current Transmit of installationMAnd CTN, before breaking down, protect installation place M and N current informationWithProtected
Deposit, while gathering the current information after breaking down
4. protection scheme according to claim 1, it is characterised in that in the step (2), using signal delay method,
Obtain the electric current positive-sequence component of the current informationIt is as follows：
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To the electric current positive-sequence componentFourier analysis is carried out, the phase of fundamental positive sequence electric current is obtained.
5. protection scheme according to claim 2, it is characterised in that
By the use of M ends and N-terminal current phase rate of change as the start-up criterion of protection, break down front and rear electricity for analysis protection installation place
The change of phase difference value is flowed, if the current phase rate of change at two ends is all higher than starting judgment threshold θ 'ζ, then M, N two ends are started
Protection criteria；
Set before and after line failure, M ends current phase rate of change isN-terminal current phase becomes
Rate isWherein, t represents fault current duration.
Set the startup judgment threshold θ ' of M ends protectionMζ, θ 'Mζ=σ (θmg0), wherein, θmg0For by current transformer conversion and microcomputer
The error angle of protector measuring influence；
Set the startup judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein, θng0For by current transformer conversion and microcomputer
The error angle of protector measuring influence；
As θ 'M＞ θ 'MζWith θ 'N＞ θ 'NζWhen being satisfied by, then the step (3) is carried out.
6. protection scheme according to claim 5, it is characterised in that the current transformer error curve is 10%, most
Big error angle is 7 °；The microcomputer protecting device is according to 50 point samplings of a cycle, and error angle is 7.2 °.
7. protection scheme according to claim 1 or 2, it is characterised in that
Using before and after breaking down, the difference of M ends and the change of N-terminal current phase analyzes two ends current phase as Protection criteria
The difference θ of changeMNChanging rule：
If the absolute value of M ends current phase change isIn formula：t1Represent occur event
At the time of barrier, T represents the time,For the M ends current phase for the previous T that breaks down,To occur
Latter T of failure M ends current phase；
If the absolute value of N-terminal current phase change isIn formula：t1Expression is broken down
At the time of, T represents the time,For the N-terminal current phase for the previous T that breaks down,To occur
Latter T of failure N-terminal current phase；
Then the difference of two ends current phase change is θMN=alpha-beta；
IfIt is then the outer failure of the end regions of circuit two；
IfIt is then circuit two ends zone fault.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611052685.XA CN107276043B (en) | 2016-11-24 | 2016-11-24 | A kind of active distribution network guard method based on electric current positive-sequence component phase change |
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| CN109449894A (en) * | 2018-10-30 | 2019-03-08 | 中国电力科学研究院有限公司 | A kind of active power distribution network current differential protection method and device |
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| CN111276950A (en) * | 2020-03-03 | 2020-06-12 | 北方工业大学 | Micro-grid protection method and system based on current polarity comparison |
| 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 |
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| CN108872799A (en) * | 2018-09-03 | 2018-11-23 | 国网山东省电力公司潍坊供电公司 | Active power distribution network fault section location method and system based on forward-order current fault component |
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| CN109959844A (en) * | 2019-01-14 | 2019-07-02 | 珠海许继电气有限公司 | A kind of judgment method and device in the distribution network failure direction containing distributed generation resource |
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| CN111276950B (en) * | 2020-03-03 | 2022-02-18 | 北方工业大学 | Micro-grid protection method and system based on current polarity comparison |
| 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 |
| CN114221301A (en) * | 2021-12-03 | 2022-03-22 | 北方工业大学 | Alternating current micro-grid protection method and device considering photovoltaic low-voltage ride through characteristics |
| CN114221301B (en) * | 2021-12-03 | 2023-11-14 | 北方工业大学 | Alternating-current micro-grid protection method and device considering photovoltaic low-voltage ride through characteristics |
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Application publication date: 20171020 Assignee: BEIJING SKYPOWER ELECTRIC TECHNOLOGY Co.,Ltd. Assignor: Beijing Jiaotong University Contract record no.: X2022990000020 Denomination of invention: An active distribution network protection method based on phase change of current positive sequence component Granted publication date: 20190412 License type: Common License Record date: 20220110 |