CN107276043B - A kind of active distribution network guard method based on electric current positive-sequence component phase change - Google Patents
A kind of active distribution network guard method based on electric current positive-sequence component phase change Download PDFInfo
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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 schemes based on electric current positive-sequence component phase change, belong to power distribution network technical field.The protection scheme includes: route both ends current information before and after acquisition is broken down；Obtain electric current positive-sequence component and its phase information；Using phase change rate single-ended before and after failure as the start-up criterion of protection, using the difference of failure rear and front end current phase variation as the main criterion protected, if difference in 0 between pi/2, for failure outside region；If difference is in pi/2 between π, for zone fault；When being determined as zone fault, sending action signal is protected from information processing centre to the both ends broken down, while the installation place of trip protection up and down sends block signal.The present invention analyzes in positive sequence network, using the difference that both ends current phase changes as Protection criteria, a possibility that identifying internal fault external fault, reduce false protection and tripping, and is suitable for any fault type.
Description
Technical field
The present invention relates to power distribution network technical fields, specifically, in particular to a kind of to be based on electric current positive-sequence component
The active distribution network guard method of phase change.
Background technique
In recent years, it as the continuous aggravation of energy crisis and country widely popularize the clean type energy, is sent out with photovoltaic
Electricity, the inverse distributed power that double-fed wind generating is representative are widely used.Distributed generation resource
(distributed generation, abbreviation DG) is a kind of emerging electric power energy, has economic and environment-friendly equal many merits, energy
Enough meet people's requirement stable and economic and environment-friendly to electric power safety.But it when a large amount of distributed generation resources access power distribution network, can lead
Conventional electrical distribution web frame is caused to become the network of multiterminal power supply power supply by traditional single supply power supply, trend frequently shifts,
The complexity of the method for operation will have a direct impact in selectivity and sensitivity containing DG distribution protection device, faces protection and refuses
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 many modifieds
Protection scheme and new protection philosophy are broadly divided into following a few classes: (1) install additional protection element method, core concept be
DG lines upstream installs directional current protection, DG downstream line adjusting protection definite value.(2) method of distance protection will contain first
Power distribution network carry out subregion, propose consider characteristic power distribution network adaptive distance protection scheme.According to system operation mode and
Output power calculates setting valve in real time.(3) adaptive guard method, according to system operation mode and network structure, to protection
Back side network carries out equivalent transformations, forms branch contribution factor matrix, to eliminate the influence to each branch current, to effectively increase
The protection scope of big main protection and back-up protection.(4) it based on the method for communication, is set using the intelligence that dispersion is mounted in power distribution network
The status information of standby acquisition each point completes collecting and exchanging for information by communication network, and the information based on multiple spot completes protection
Judgement, such as multi-Agent or IED protection.
It is required to collection voltages amount information in above method, however installs mutual induction of voltage in current urban power distribution network
Device will lead to that at high cost, engineering is cumbersome, constrain popularization and application of the above method in distribution protection.
Summary 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 change
Network protection method constitutes Protection criteria using the difference of both ends current phase variation, suitable for containing inverse distributed power
Active distribution network network only need to extract current information, without installing voltage transformer in power distribution network, can solve distribution
The problem of plant-grid connection power distribution network causes the method for operation complicated and causes route protection tripping and malfunction.
To achieve the goals above, the invention adopts the following technical scheme:
Active distribution network guard method of the present invention based on electric current positive-sequence component phase change, is arranged in power distribution network
There is information processing centre, comprising the following steps:
(1) before and after acquisition is broken down, the current information of installation place is protected at route both ends；
(2) the electric current positive-sequence component of current information and the phase of electric current positive-sequence component are obtained；
(3) using front and back of breaking down, the difference of both ends current phase variation is as Protection criteria, if both ends current phase
The difference of variation is in 0 between pi/2, then is failure outside region；If both ends current phase variation difference be in pi/2 to π it
Between, then it is zone fault；
(4) when being determined as zone fault, sending action signal is protected from information processing centre to both ends, it is ensured that occur
The route both ends protection of failure all acts, while sending block signal to the upstream and downstream at the both ends broken down protection installation place.
Preferably, between step (2) and step (3) further include:
Utilize front and back of breaking down, start-up criterion of the one-terminal current phase change rate as protection, analysis protection installation place
The variation for the front and back current phase difference that breaks down, if the current phase change rate at both ends is all larger than respective starting and judges threshold
Value, then carry out step (3).
Preferably, in step (1), pass through the Current Transmit of both ends installation in power distribution networkMAnd CTN, to breaking down
Before, protect the current information of installation place M and NWithIt is saved, while acquiring the current information after breaking down
Preferably, in step (2), using signal delay method, the electric current positive-sequence component of current information is obtainedIt is as follows:
To electric current positive-sequence componentFourier analysis is carried out, the phase of fundamental positive sequence electric current is obtained.
Preferably, using the end M and N-terminal current phase change rate as the start-up criterion of protection, analysis protection installation place hair
The variation of current phase difference before and after raw failure, if the current phase change rate at both ends is all larger than starting judgment threshold θ 'ζ, then open
The Protection criteria at the dynamic both ends M, N；
Before and after setting line failure, the end M current phase change rate isN-terminal electric current phase
Position change rate beWherein, t indicates fault current duration, by distributed generation resource control strategy
Influence；
Set the starting judgment threshold θ ' of the end M protectionMζ, θ 'Mζ=σ (θmg0), wherein θmg0To be converted by current transformer
The error angle influenced with microcomputer protecting device measurement；
Set the starting judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein θng0To be converted by current transformer
The error angle influenced with microcomputer protecting device measurement；
As θ 'M> θ 'MζWith θ 'N> θ 'NζWhen being all satisfied, then step (3) are carried out.
Further, it is preferable to, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer Protection dress
It sets according to 50 point samplings of a cycle, error angle is 7.2 °.
Further, it is preferable to, using front and back of breaking down, the difference of the end M and the variation of N-terminal current phase is sentenced as protection
According to the difference θ of analysis both ends current phase variationMNChanging rule:
If the absolute value of the end M current phase variation isIn formula: t1Indicate hair
At the time of raw failure, T indicates the time,For the end the M current phase for the previous T that breaks down,For
The end the M current phase of the latter that breaks down T；
If the absolute value of N-terminal current phase variation isIn formula: t1Indicate hair
At the time of raw failure, T indicates 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 breaks down；
Then the difference of both ends current phase variation is θMN=alpha-beta；
IfIt is then the outer failure of two end regions of route；
IfIt is then route both ends zone fault.
Compared with prior art, the present invention has the following advantages and beneficial effects:
One, the present invention is according to before and after line failure, and the difference of both ends current phase variation is as Protection criteria, identification
A possibility that internal fault external fault, reduction false protection and tripping；
Two, the present invention need not obtain line voltage distribution information, avoid and set up voltage transformer, economy in protection installation place
It is higher；
Three, the present invention is based on electric current positive-sequence components is analyzed 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.
Detailed description of the invention
Fig. 1 is the active distribution network guard method preferred embodiment of the present invention based on electric current positive-sequence component phase change
Flow chart；
Fig. 2 is the structural schematic diagram of the distribution network system in the present invention containing distributed generation resource；
Fig. 3 is network before line failure in the present invention；
Positive sequence additivity when Fig. 4 is route generation area internal fault in the present invention；
Fig. 5 is the positive sequence additivity in the present invention outside route generation area when failure.
Specific embodiment
Now in conjunction with attached 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 guard method preferred embodiment of the present invention based on electric current positive-sequence component phase change
Flow chart.As shown in Figure 1, the guard method the following steps are included:
(1) before and after acquisition is broken down, the current information of installation place is protected at route both ends；
(2) the electric current positive-sequence component of current information and the phase of electric current positive-sequence component are obtained；
(3a) is protected using the start-up criterion of front and back, the end M and N-terminal current phase change rate as protection that breaks down, analysis
Shield installation place is broken down the variation of front and back current phase difference, if the current phase change rate at both ends is all larger than respective starting
Judgment threshold then starts the main criterion of the both ends M, N protection；The start-up criterion of protection is set, to prevent the small of electric current in route
The problem of fluctuation causes misinformation to be led reduces the traffic in route, while improving the selectivity and sensitivity of protective device；
Main criterion of the difference that (3b) is changed using front and back of breaking down, the end M and N-terminal current phase as protection, if two
It holds the difference of current phase variation to be in 0 between pi/2, is then failure outside region；If at the difference of both ends current phase variation
It is then zone fault in pi/2 between π；
(4) when being determined as zone fault, sending action signal is protected from information processing centre to both ends, protects both ends
Shield all acts, while sending block signal to the upstream and downstream at the both ends broken down protection installation place.
Fig. 2 is the structural schematic diagram of the distribution network system in the present invention containing distributed generation resource.As shown in Fig. 2, utilizing
The distribution network containing DG that MATLAB software is built, power distribution network reference capacity are 500MVA, reference voltage 10.5kV.AG and AE
It is two feeder lines drawn in power supply 10kV bus, the correspondence breaker of every route is QF1~QF8, and every wireline inspection arrives
Electric current be I1~I8, it is specified that the positive direction of electric current be route both ends be directed toward protected circuit.Wherein, route AB, BC, AF are frame
Ceases to be busy road, line length are respectively 2km, 2km, 4km.Route CD, DE, FG are buried cable, and line length is respectively 7km,
14km, 6km.ESIt is system power supply, ZSIt is system impedance.
Firstly, initiating line parameter, route AB, BC, AF select LGJ-120/25 steel-cored aluminium strand, line parameter circuit value χ1
=0.347 Ω/km, r1=0.27 Ω/km, route CD, DE, FG select YJLV22-150/60 copper core cross-linked polrvinyl chloride cable,
Line parameter circuit value is χ1=0.093 Ω/km, r1=0.259 Ω/km；
According to the Practical Project of power grid, the rated capacity of each distributed generation resource DG is PDG1=2MW, PDG2=2MW, wherein
There is no DG access 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, the load that power factor is 0.85.
Fig. 3 shows the network before line failure, and in Fig. 3, M, N are protection installation place,WithIndicate M, N
Two sides PRE-FAULT CURRENT, electric current positive direction are that node is directed toward protected circuit,WithThe respectively side M and N side system etc.
Imitate power supply, ZSMAnd ZSNThe respectively side M and N side system equivalent impedance, ZlFor the line impedance between node M and node N.
Fig. 4 and Fig. 5 respectively illustrates the positive sequence additivity of failure outside in generation area and region, wherein f indicates to occur
Location of fault,WithFor the fault component electric current of the two sides M, N, electric current positive direction is that node is directed toward protected circuit,
ZSM1And ZSN1The respectively side M and the equivalent positive sequence impedance of N side system, Zl1And Zl2The respectively line of node M and node N to fault point f
Road positive sequence impedance, RfFor transition resistance,For fault point voltage.
When between circuit breaker Q F5 and QF6 at the f of route in t1When moment breaks down, by matching containing distributed generation resource
Current Transmit in power gridMAnd CTN, to the current information of the T for the previous period of line failureWith
While acquiring the current information of a period of time T after line failureWith
Using signal delay method, the electric current positive-sequence component of acquired current information is obtainedIt is as follows:
In formula,Ia、Ib、IcThe respectively 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.
Using the end M and N-terminal current phase change rate as the start-up criterion of protection, before analysis protection installation place is broken down
The variation of current phase difference afterwards, if the current phase change rate at both ends is all larger than respective starting judgment threshold θ 'ζ, then start
M, the Protection criteria at the both ends N；
Before and after setting line failure, the end M current phase change rate isN-terminal electric current phase
Position change rate beWherein, t indicates fault current duration, is controlled plan by distributed generation resource
Influence slightly；
Set the starting judgment threshold θ ' of the end M protectionMζ, θ 'Mζ=σ (θmg0), wherein θmg0To be converted by current transformer
The error angle influenced with microcomputer protecting device measurement；
Set the starting judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein θng0To be converted by current transformer
The error angle influenced with microcomputer protecting device measurement；
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 are 7.2 °.
As θ 'M> θ 'MζWith θ 'N> θ 'NζWhen being all satisfied, then start the main criterion of the both ends M, N protection.
Using front and back of breaking down, the difference of the end M and the variation of N-terminal current phase analyzes both ends electricity as main criterion is protected
Flow the difference θ of phase changeMNChanging rule:
If the absolute value of the end M current phase variation isIn formula: t1It indicates
At the time of breaking down, T indicates the time,For the end the M current phase for the previous T that breaks down,
For the end the M current phase for the latter T that breaks down；
If the absolute value of N-terminal current phase variation isIn formula: t1Indicate hair
At the time of raw failure, T indicates 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 breaks down；
Then the difference of both ends current phase variation is θMN=alpha-beta；
IfIt is then the outer failure of two end regions of route, at this point, both ends protection is failure to actuate；
IfThen it is route both ends zone fault, is sent at this point, being protected from information processing centre to both ends
Action signal, while block signal is sent to the upstream and downstream at the both ends broken down protection installation place.
Since the present invention is analyzed in positive sequence network figure based on electric current positive-sequence component, so route protection is suitable for
Any fault type.
Three kinds of different fault types are set forth below to be explained:
Type one
When singlephase earth fault occurs for f point, it is -6.05 ° that protection 1, which measures PRE-FAULT CURRENT phase, electric current after failure
Phase is -40.86 °；It is 175.66 ° that protection 2, which measures fault current phase, and current phase is 140.87 ° after failure；Protection 3 is surveyed
Obtaining fault current phase is -12.6 °, and 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 -12.6 ° that protection 5, which measures fault current phase, current phase after failure
It is -64.95 °；It is 168.2 ° that protection 6, which measures fault current phase, 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 ° that protection 8, which measures fault current phase, failure
Current phase is 99.59 ° afterwards.Herein, current transformer error curve is 10%, and worst error angle is 7 °；Microcomputer Protection dress
It sets 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 comparison, θ '5> θ '5ζ, θ '6> θ '6ζ, protection 5,6 device start-up criterions movement, pi/2 < θ56< π protects main criterion to act,
It is judged as land internal fault, 5,6 device actions are protected at both ends.
Type two
When phase-to phase fault occurs for f point, it is -6.07 ° that protection 1, which measures PRE-FAULT CURRENT phase, current phase after failure
It is -41.37 °；It is 173.95 ° that protection 2, which measures fault current phase, and current phase is 138.62 ° after failure；Protection 3 measures event
Hindering current phase is -12.5 °, and current phase is -48.57 ° after failure；It is 167.4 ° that protection 4, which measures fault current phase, failure
Current phase is 131.32 ° afterwards；It is -12.5 ° that protection 5, which measures fault current phase, and current phase is -63.78 ° after failure；It protects
It is 167.5 ° that shield 6, which measures fault current phase, and current phase is -83.1 ° after failure；Protection 7 measure fault current phase be-
33.1 °, current phase is -81.2 ° after failure；It is 146.9 ° that protection 8, which measures fault current phase, 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 are 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 movement, pi/2 < θ56< π protects main criterion to act, is judged as route
5,6 device actions are protected at zone fault, both ends.
Type three
When three-phase fault occurs for f point, it is -6.09 ° that protection 1, which measures PRE-FAULT CURRENT phase, current phase after failure
It is -42.86 °；It is 163.93 ° that protection 2, which measures fault current phase, 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；It is 167.3 °, after failure that protection 4, which measures fault current phase,
Current phase is 132.49 °；It is -12.7 ° that protection 5, which measures fault current phase, and current phase is -63.76 ° after failure；Protection 6
Measuring fault current phase is 167.3 °, and current phase is -86 ° after failure；It is -33.27 ° that protection 7, which measures fault current phase,
Current phase is -83 ° after failure；It is 146.73 ° that protection 8, which measures fault current phase, 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 movement, pi/2 < θ56< π protects main criterion to act, and is judged as land internal fault, and two
5,6 device actions of end protection.
To sum up, on the basis of being based on positive sequence network, using one-terminal current phase change rate as the start-up criterion of protection, with
Main criterion of the difference of both ends current phase variation as protection improves and is containing in the case where that need not obtain information of voltage
The reliability protected in the active distribution network of distributed generation resource reduces the possibility of malfunction and movement resistance work of route protection etc.
Property, and it is suitable for any fault type.
More than, it is merely a preferred embodiment of the present invention, is not intended to restrict the invention, come for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of active distribution network guard method based on electric current positive-sequence component phase change, is provided at information in power distribution network
Reason center, which comprises the following steps:
(1) before and after acquisition is broken down, the current information of installation place is protected at route both 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 front and back of breaking down, the difference of both ends current phase variation is as Protection criteria, if both ends current phase changes
Difference be in 0 between pi/2, then be failure outside region；If the difference of both ends current phase variation is in pi/2 between π,
For zone fault；
(4) when being determined as zone fault, sending action signal is protected from information processing centre to both ends, while former to occurring
The upstream and downstream protection installation place at the both ends of barrier sends block signal.
2. guard method according to claim 1, which is characterized in that between the step (2) and the step (3) also
Include:
Using front and back of breaking down, start-up criterion of the one-terminal current phase change rate as protection, installation place is protected in analysis
The variation of current phase difference before and after failure, if the current phase change rate at both ends is all larger than respective starting judgment threshold,
Carry out the step (3).
3. guard method according to claim 1, which is characterized in that in the step (1), pass through both ends in power distribution network
The Current Transmit of installationMAnd CTN, before breaking down, protect the current information of installation place M and NWithIt is protected
It deposits, while acquiring the current information after breaking down
4. guard method according to claim 1, which is characterized in that in the step (2), using signal delay method,
Obtain the electric current positive-sequence component of the current informationIt is as follows:
To the electric current positive-sequence componentFourier analysis is carried out, the phase of fundamental positive sequence electric current is obtained.
5. guard method according to claim 2, which is characterized in that
Using the end M and N-terminal current phase change rate as the start-up criterion of protection, break down front and back electricity for analysis protection installation place
The variation of phase difference value is flowed, if the current phase change rate at both ends is all larger than starting judgment threshold θ 'ζ, then start the both ends M, N
Protection criteria；
Before and after setting line failure, the end M current phase change rate isN-terminal current phase becomes
Rate isWherein, t indicates that fault current duration, α ' (t) indicate that the end M current phase becomes
Rate, f indicate the position broken down,Indicate the fault component electric current at the end M；β ' (t) indicates N-terminal current phase change rate,Indicate the fault component electric current of N-terminal；
Set the starting judgment threshold θ ' of the end M protectionMζ, θ 'Mζ=σ (θmg0), wherein θmg0For by current transformer conversion and microcomputer
The error angle that protector measuring influences；
Set the starting judgment threshold θ ' of N-terminal protectionNζ, θ 'Nζ=σ (θng0), wherein θng0For by current transformer conversion and microcomputer
The error angle that protector measuring influences；
As θ 'M> θ 'MζWith θ 'N> θ 'NζWhen being all satisfied, then the step (3) are carried out.
6. guard method according to claim 5, which is characterized in that the current transformer error curve is 10%, most
Big error angle is 7 °；For the microcomputer protecting device according to 50 point samplings of a cycle, error angle is 7.2 °.
7. guard method according to claim 1 or 2, which is characterized in that
Using front and back of breaking down, the difference of the end M and the variation of N-terminal current phase analyzes both ends current phase as Protection criteria
The difference θ of variationMNChanging rule:
If the absolute value of the end M current phase variation isIn formula: t1It indicates that event occurs
At the time of barrier, T indicates the time,For the end the M current phase for the previous T that breaks down,To occur
The end the M current phase of failure the latter T；
If the absolute value of N-terminal current phase variation isIn formula: t1It indicates that event occurs
At the time of barrier, T indicates the time,For the N-terminal current phase for the previous T that breaks down,For hair
The N-terminal current phase of raw failure the latter T；
Then the difference of both ends current phase variation is θMN=alpha-beta；
IfIt is then the outer failure of two end regions of route；
IfIt is then route both ends zone fault.
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| CN108872799B (en) * | 2018-09-03 | 2020-06-26 | 国网山东省电力公司潍坊供电公司 | Active power distribution network fault section positioning method and system based on positive sequence current fault component |
| 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 |
| CN109959844B (en) * | 2019-01-14 | 2021-06-04 | 珠海许继电气有限公司 | Method and device for judging fault direction of power distribution network with distributed power supply |
| 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 |
| 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 |
| 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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| 基于电流相角突变量方向的有源配电网保护;司新跃 等;《电力系统自动化》;20140610;第38卷(第11期);第97-103页 |
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| CN107276043A (en) | 2017-10-20 |
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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 |