CN106501667B - A kind of fault-line selecting method of single-phase wire break containing distributed power distribution network - Google Patents
A kind of fault-line selecting method of single-phase wire break containing distributed power distribution network Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a kind of fault-line selecting methods of single-phase wire break containing distributed power distribution network, comprising: the negative-sequence current of each feeder line is calculated using symmetrical component method；EMD decomposition is carried out to the negative-sequence current of each feeder line, obtains the intrinsic modal components IMF of each rank；Modal components IMF intrinsic to each rank carries out Hilbert transformation respectively, obtains its corresponding instantaneous amplitude waveform；On the basis of the moment occurs by failure, calculate separately the intrinsic modal components IMF of each feeder line setting order before failure with the variable quantity of the sum of instantaneous amplitude of each m cycle and the sum of the instantaneous amplitude after the period is set after failure；Disconnection fault route is judged according to the size of variable quantity.The present invention considers that the variation characteristic of the protection each electrical quantity in installation place after single-phase wire break failure occurs for the distribution line of distributed generation resource by analysis, proposes the characteristic quantity after breaking protection criterion, amplification failure occur, achievees the purpose that reliably to detect failure.
Description
Technical field
The present invention relates to distribution network fault line selection technical fields more particularly to a kind of conventional electrical distribution net single-phase wire break failure to select
Line method.
Background technique
The distributed generation resource of Small And Medium Capacity is applied in power distribution network more and more widely, on the one hand increases the warp of power grid
Ji property and flexibility, while new problem is also brought to the power supply reliability of power grid, relay protection etc..Distributed generation resource access is matched
After power grid, it will had an impact to the size of the voltage and current at route both ends.After breaking down, protection installation is even more influenced
The voltage and current size at place may cause original Protection criteria and failure judgment method and no longer be applicable in.Therefore to containing distribution
The variation characteristic of system is analyzed and is proposed that corresponding Protection criteria seems very after the distribution line of formula power supply breaks down
It is necessary to.
In order to solve this problem, colleges and universities and scientific research institutions propose various counter-measures from different aspect.University Of Tianjin from
Theoretically derived after distributed generation resource access power distribution network when breaking down corresponding short circuit current expression formula and its to protection
With the influence of reclosing, and on the basis of existing self-adaptive current fast tripping protection, to the distribution system containing distributed generation resource
Adaptive current fast- tripping protection current protection is adjusted again；South China Science & Engineering University proposes the distribution network failure of meter and DG control characteristic
Analysis method, is established under the conditions of symmetric fault and distributed electrical source model under the conditions of unbalanced fault, simulation results show
Symmetric fault and asymmetric fault current calculation method；Beijing Jiaotong University has theoretically derived fault current and DG capacity, DG
The relationship of access point position and abort situation, quantitative analysis simultaneously demonstrate DG to the shadow of power distribution network current protection and reclosing
It rings, and proposes the distribution protection scheme for being suitable for more DG access；Southwest Jiaotong University analyzes common several distributed electricals
Source Type and Equivalent Model derive three short circuit current value expression, obtain distributed generation resource to the shadow of original relaying configuration
It rings.
However, the studies above mostly concentrates on the impact analysis based on distributed generation resource under short circuit condition to protection, and divide
To the influence of single-phase wire break failure after cloth plant-grid connection, not yet someone is referred to.In order to adapt to the development of intelligent power distribution network construction
It is required that improving power supply reliability, the economy of distributed generation resource access power grid is played to the maximum extent, to containing distributed generation resource
Distribution line single-phase wire break failure should be furtherd investigate.
Summary of the invention
The object of the invention is to provide a kind of single-phase wire break containing distributed power distribution network to solve above-mentioned problem
Fault-line selecting method, this method protect installation place after single-phase wire break failure occurs by distribution line of the analysis containing distributed generation resource
The variation characteristic of each electrical quantity proposes breaking protection criterion, the feature by handling criterion, after amplification failure generation
Amount, achievees the purpose that reliably to detect failure.
To achieve the above object, concrete scheme of the invention is as follows:
A kind of fault-line selecting method of single-phase wire break containing distributed power distribution network, comprising:
(1) assume that substation bus bar synteny has n feeder line, acquire the three-phase phase current in each feeder line exit, calculate each
The negative-sequence current of feeder line；
(2) amplitude of the negative-sequence current for each feeder line being calculated is compared with negative phase-sequence setting valve, works as negative-sequence current
Amplitude be greater than negative phase-sequence setting valve when starting step (3)；Otherwise, return step (1)；
(3) EMD decomposition is carried out to the negative-sequence current of each feeder line, obtains the intrinsic modal components IMF of each rank；And calculate each rank sheet
Levy the corresponding instantaneous amplitude waveform of modal components IMF；
(4) on the basis of the failure generation moment, the intrinsic modal components IMF of each feeder line setting order is calculated separately in failure
The variable quantity of the sum of instantaneous amplitude of each m cycle and the sum of the instantaneous amplitude after the setting period after preceding and failure；
(5) variation of the sum of instantaneous amplitude of each m cycle after the period is set before failure, after failure according to each feeder line
The size of amount judges disconnection fault route.
Further, in the step (2), negative phase-sequence setting valve is according to this feeder line when escaping other feeder line single-phase wire break failures
The negative-sequence current of upper generation is adjusted.
Further, the negative phase-sequence setting valve I2.set=kk|i2|；Wherein, kkFor safety factor.
Further, modal components IMF intrinsic to each rank carries out Hilbert transformation respectively in the step (3), obtains it
Corresponding instantaneous amplitude waveform.
Further, in the step (4), the intrinsic modal components IMF of each feeder line second order is calculated separately2It is before failure and former
The sum of instantaneous amplitude after barrier.
Further, in the step (4), period as 6 periods or 7 periods are set.
Further, in the step (5), each feeder line is set to each m cycle after the period before failure, after failure
The variable quantity of the sum of instantaneous amplitude is descending to be ranked up, and chooses first three feeder line as doubtful disconnection fault route.
Further, in the step (5), each feeder line is set to each m cycle after the period before failure, after failure
The variable quantity of the sum of instantaneous amplitude is descending to be ranked up, and selection variable quantity the maximum is disconnection fault route.
Beneficial effects of the present invention:
In the distribution line single-phase wire break failure line selection containing distributed generation resource, with negative-sequence current and negative-sequence current Martin Hilb
The intrinsic modal components of spy-Huang second order are bonded route selection criterion, there is following application effect:
(1) distributed electrical source model meter and the influence of control strategy more can relative to the equivalent method in constant potential source
Reality output characteristic before and after correct simulation distribution formula power failure, is a kind of accurate equivalent way.
(2) it can detect and be out of order just with the current signal of protection installation place after failure, not need voltage signal,
The current signal of other positions is not needed, method is simple and convenient, reduces the installing requirement of voltage transformer and current transformer；
Compared with based on the protection of multiple spot information content, additional communication system is not needed, there is apparent economy.
(3) using criterion characteristic quantity after Hilbert-Huang transform algorithm process, variable quantity increases before and after failure, and can be with
Non-fault line is reliably distinguished, high sensitivity.And adjust the numerical value of m, adjustable sensitivity.M value is bigger, and sensitivity is got over
It is high.
(4) Protection criteria and detection algorithm can be suitably used for the distribution line containing distributed generation resource, and flexibility is good, and not by
The influence of neutral operation method.
Detailed description of the invention
Fig. 1 is the 10kV distribution system structure chart of simplified consideration distributed generation resource；
Fig. 2 is distributed power source output power；
Fig. 3 is disconnection fault route selection flow chart of the present invention；
Fig. 4 is the 10kV power distribution network simulation model containing distributed generation resource；
Fig. 5 (a) is faulty line L1 negative-sequence current waveform；
Fig. 5 (b) non-fault line L2 negative-sequence current waveform；
Fig. 6 (a) is the instantaneous amplitude of negative-sequence current IMF2；
Fig. 6 (b) is the S before failure with negative-sequence current after failureIMF。
Specific embodiment:
The present invention is described in detail with reference to the accompanying drawing:
10kV distribution line single-phase wire break failure containing distributed generation resource can use the simplification system representation of attached drawing 1.SDG is point
Cloth equivalent source, because inverse distributed power (IIDG) is most widely used, IIDG generally uses electricity when being incorporated into the power networks
Flow pattern PQ control mode, SDG can be equivalent at a controlled current source, and is linked into route by feeder line.
Using failure mutually as analysis object, using boundary condition, the compound sequence network after single-phase wire break failure occurs is obtained, it can
The superposition of load condition before regarding broken string as and the failure additivity after broken string；According to Kirchoff s voltage current law, column
Each sequence voltage in installation place is protected under the additivity that is out of orderWith each sequence electric current
It is protected each sequence voltage electric current in installation place to be overlapped the sequence voltage that can be calculated after being out of order generation by equation with before failure With sequence electric currentBy sequence voltage and sequence electric current, the phase electricity of protection installation place can be calculated
Pressure With phase current
It can be obtained by theory deduction result, after single-phase wire break failure occurs for route, protect the negative-sequence current and positive sequence of installation place
Electric current all produces variation, and equal in magnitude, contrary.Negative-sequence current and forward-order current after failure consist of two parts,
The failure sequence electric current that the sequence electric current and distributed generation resource that main power source provides export after a failure.The former is related with load character,
The latter is related with the amount of capacity of distributed generation resource, control strategy and on-position.Failure phase phase current becomes zero, two non-events
Hinder the mutually equal in magnitude of phase, it is contrary.Protect each sequence voltage in installation place and each phase voltage size direction constant.
Power distribution network in actual motion generally with comprehensive load, therefore in the amount of capacity and access of distributed generation resource
In the case that position determines, the output electric current of distributed generation resource is mainly related with control strategy.The present invention is directed to PQ control mode,
After single-phase wire break failure, negative sequence component will occur in grid entry point voltage.System becomes three-phase unsymmetrical winding, and due to negative sequence component
Presence, the active power and reactive power of distributed generation resource output will generate two double-frequency fluctuations, cause in double-closed-loop control electric
The d shaft current instruction of pressure ring output is with twice of oscillation frequency, and PI controller can not carry out error free tracking to sinusoidal quantity, in failure
Stable state is unable to reach after generation, as shown in Fig. 2.
After breaking down, the oscillation of distributed generation resource active power of output and reactive power will lead to the phase of protection installation place
Electric current and sequence electric current also vibrate, and increase many than the amplitude before failure.Since phase current and forward-order current are before failure
Existing certain numerical value, and negative-sequence current is substantially zeroed before failure, variable quantity is bigger, therefore can choose negative-sequence current conduct
Single-phase wire break Protection criteria.
Directly relatively the negative-sequence current of front and back occurs for failure to identify faulty line, and sensitivity is sometimes not high enough.Therefore originally
Invention amplifies fault characteristic value using digital processing method indirectly, improves the reliability and sensitivity of broken string route selection.
Hilbert-Huang transform is highly effective for handling non-fundamental frequency transient signal.It is proved by a large amount of experimental study,
Compared with conventional electrical distribution net, after failure occurs, control loop containing distributed generation resource can just make by the transient process in 6-7 period
Output reaches oscillation stable state.Vibrating stable state has bigger amplitude than the negative-sequence current of transient process, therefore the present invention is to protection
Negative-sequence current before and after the failure of installation place carries out Hilbert-Huang transform, and the moment occurs as datum mark using failure, chooses 7
The change of the sum of instantaneous amplitude of m cycle of negative-sequence current and the sum of instantaneous amplitude of m cycle of negative-sequence current before failure after cycle
Change amount realizes the highly sensitive power distribution network single-phase disconnection failure line selection containing distributed generation resource as criterion.
To achieve the above object, the distribution line single-phase wire break failure line selection process proposed by the present invention containing distributed generation resource
As shown in Fig. 3.If substation bus bar synteny has n feeder line, route selection process is described in detail below:
(1) the three-phase phase current for acquiring each feeder line exit, the negative-sequence current of each feeder line is calculated using symmetrical component method
i2k(k=1,2 ... n)；
(2) amplitude of the negative-sequence current of each feeder line | i2k| with negative phase-sequence setting valve I2.setCompare, starting step when being greater than definite value
(3), the moment and using this moment as failure occurs；Otherwise, step (1) is returned to.The setting valve is single-phase disconnected by other feeder lines are escaped
The negative-sequence current i generated on this feeder line when line failure2It is adjusted, i.e. I2.set=kk|i2|, wherein kkFor safety factor.
(3) to the negative-sequence current i of each feeder line2kEMD decomposition is carried out, the intrinsic modal components IMF of each rank is obtained.
(4) it takes each rank IMF to carry out Hilbert transformation, obtains its corresponding instantaneous amplitude waveform.Verified discovery, second order sheet
Levy modal components IMF2Instantaneous amplitude change before failure and after failure it is the most significant；
(5) on the basis of the failure generation moment, each feeder line IMF is calculated separately2.kBefore failure and after 7 periods after failure
The sum of the instantaneous amplitude of each m cycle, calculation formula is as follows:
Wherein:For the IMF of m cycle before kth feeder fault2The sum of instantaneous amplitude；For kth item
After feeder fault after 7 periods m cycle IMF2The sum of instantaneous amplitude；N is the sampling number in a cycle.Due to herein
Middle distribution system working frequency is 50Hz, and sample frequency is set as 1000Hz, therefore j=20.Feeder fault is selected in the present embodiment
Afterwards after 7 periods m cycle IMF2The sum of instantaneous amplitude, after those skilled in the art select feeder fault according to actual needs
After 6 periods (or the IMF of m cycle after the quantity period is set after failure2The sum of instantaneous amplitude).
(6) IMF of m cycle after 7 periods after m cycle and failure is calculated before each feeder fault2The sum of instantaneous amplitude
Variation deltaIMF2.k。
Disconnection fault route can be judged there are two types of mode: the first, ΔIMF2.kThe maximum is disconnection fault route；Second
Kind, the variation delta of each feeder lineIMF2.kIt sorts by descending order, first three corresponding doubtful disconnection fault route.
In order to verify above-mentioned fault detection method, established based on PSCAD/EMTDC as shown in Fig. 4 containing distributed electrical
The 10kV power distribution network simulation model in source, using MATLAB as Digital Signal Processing tool.Wherein, L1 representing fault route, L2 generation
Table non-fault line；Distributed electrical Source Type is photo-voltaic power supply, using PQ control strategy；System institute's on-load is constant power load
2.5MW+0.2Mvar；Single-phase wire break failure occurs for A phase when t=0.4s.
Shown in the negative-sequence current such as attached drawing 5 (a), attached drawing 5 (b) of faulty line L1 and non-fault line L2.As seen from the figure, it sends out
After raw failure, the negative-sequence current on faulty line L2 generates mutation, and increment is stablized after 6-7 cycle transient process, number
It is more much bigger than the negative-sequence current on L2 on non-fault line in value, it can obviously be distinguished with non-fault line.
Former intrinsic modal components IMF of rank contain main fault message in Hilbert-Huang transform, before choosing here
Quadravalence is analyzed.After single-phase wire break failure occurs for route, EMD decomposition is carried out to the negative-sequence current of protection installation place, is obtained
Several rank IMF.Sample the sum of instantaneous amplitude in a cycle after preceding quadravalence IMF plays 7 cycles before failure with fault moment
As shown in attached drawing 6 (b).As can be seen that before and after failure, the intrinsic modal components IMF of second order2Instantaneous amplitude in one cycle
The sum of change the most obvious, therefore select SIMF2Variable quantity as the characteristic quantity for judging single-phase wire break failure.
The intrinsic mode IMF of negative-sequence current second order2Instantaneous amplitude such as attached drawing 6 (a).As seen from the figure, after breaking down, IMF2
Instantaneous amplitude increases rapidly after 6-7 cycle.Therefore, it can sample all with m after 7 periods of fault moment before failure occurs
The IMF of wave2Instantaneous amplitude as research object, wherein m=1,2,3 ..., as shown in subordinate list 2.Taken altogether in table 1 to
The sum of instantaneous amplitude in 10 cycles.By table as it can be seen that the periodicity taken is more, the variable quantity of the sum of instantaneous amplitude is got over before and after failure
Greatly, it protects sensitiveer and obviously bigger than the numerical value on non-fault line.
After breaking down, the variable quantity of the negative-sequence current of each route is as shown in appendix 1.By comparing subordinate list 1 and subordinate list 2
Variable quantity (Δ) result is it is found that if the variable quantity that front and back negative-sequence current directly occurs to failure carries out route selection, and sensitivity is far not
Such as use IMF2The variable quantity of the sum of instantaneous amplitude is as criterion height.As it can be seen that selecting the intrinsic modal components IMF of negative-sequence current second order2
Variable quantity before failure with the sum of the instantaneous amplitude of several cycles after 7 periods of fault moment is as judgement, Neng Goushi
Now reliably select broken string route.
1 negative-sequence current of subordinate list | i2k| the variation before and after failure
The instantaneous amplitude of the intrinsic modal components IMF2 of 2 second order of subordinate list within m period the sum of sampled value (wherein, m=1,
2,...,10)
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (8)
1. a kind of fault-line selecting method of single-phase wire break containing distributed power distribution network, characterized in that include:
(1) assume that substation bus bar synteny has n feeder line, acquire the three-phase phase current in each feeder line exit, calculate each feeder line
Negative-sequence current；
(2) amplitude of the negative-sequence current for each feeder line being calculated is compared with negative phase-sequence setting valve, when the width of negative-sequence current
Starting step (3) when value is greater than negative phase-sequence setting valve；Otherwise, return step (1)；
(3) EMD decomposition is carried out to the negative-sequence current of each feeder line, obtains the intrinsic modal components IMF of each rank；And calculate each rank eigen mode
The corresponding instantaneous amplitude waveform of state component IMF；
(4) on the basis of the failure generation moment, the intrinsic modal components IMF for calculating separately each feeder line setting order is each before failure
The intrinsic modal components IMF of the sum of the instantaneous amplitude of m cycle, each feeder line setting order sets each m after the period after a failure
The sum of the instantaneous amplitude of a cycle sets the wink of each m cycle after the period after the sum of instantaneous amplitude before failure and failure
When the sum of amplitude variable quantity；
(5) variable quantity of the sum of instantaneous amplitude of each m cycle after the period is set before failure, after failure according to each feeder line
Size judges disconnection fault route.
2. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
State in step (2), negative phase-sequence setting valve according to the negative-sequence current generated on this feeder line when escaping other feeder line single-phase wire break failures into
Row adjusting.
3. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 2, characterized in that institute
State negative phase-sequence setting valve I2.set=kk|i2|；Wherein, kkFor safety factor, i2This feedback when to escape other feeder line single-phase wire break failures
The negative-sequence current generated on line.
4. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
It states modal components IMF intrinsic to each rank in step (3) and carries out Hilbert transformation respectively, obtain its corresponding instantaneous amplitude waveform.
5. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
It states in step (4), calculates separately the intrinsic modal components IMF of each feeder line second order2The sum of instantaneous amplitude before failure and after failure.
6. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
It states in step (4), sets period as 6 periods or 7 periods.
7. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
It states in step (5), each feeder line is set to the variation of the sum of instantaneous amplitude of each m cycle after the period before failure, after failure
Measure it is descending be ranked up, choose first three feeder line as doubtful disconnection fault route.
8. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as described in claim 1, characterized in that institute
It states in step (5), each feeder line is set to the variation of the sum of instantaneous amplitude of each m cycle after the period before failure, after failure
Measure it is descending be ranked up, selection variable quantity the maximum be disconnection fault route.
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| CN109782126B (en) * | 2018-12-27 | 2021-01-01 | 上海交通大学 | Power distribution network early fault detection method based on humanoid concept learning |
| CN109917227A (en) * | 2019-03-26 | 2019-06-21 | 上海交通大学 | Power distribution network single-phase disconnection fault identification method based on phase relation |
| CN110514954B (en) * | 2019-05-31 | 2021-11-09 | 国网辽宁省电力有限公司电力科学研究院 | Power line fault diagnosis method and system based on PMU data |
| CN110596510A (en) * | 2019-07-11 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Single-phase grounding detection method based on negative sequence current vector analysis |
| CN110940894B (en) * | 2019-12-16 | 2022-02-11 | 国网北京市电力公司 | Electric shock fault detection method based on instantaneous amplitude-phase sum characteristics of leakage current |
| CN111371077B (en) * | 2020-01-14 | 2021-01-08 | 山东大学 | Protection control method suitable for elastic intelligent power distribution network with multiple fault types |
| CN111337855B (en) * | 2020-03-18 | 2022-06-21 | 贵州电网有限责任公司 | Active power distribution network disconnection fault protection method based on negative sequence current ratio |
| CN111323733B (en) * | 2020-03-23 | 2021-12-07 | 贵州电网有限责任公司 | Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal |
| CN112485590A (en) * | 2020-11-19 | 2021-03-12 | 云南电网有限责任公司临沧供电局 | Power distribution network single-phase line-breaking fault identification method |
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| CN102129010B (en) * | 2011-01-12 | 2012-10-24 | 云南电网公司楚雄供电局 | Fault line selection method of distribution network based on empirical mode decomposition (EMD) |
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Inventor after: Liu Zongjie Inventor after: Huang Tantan Inventor after: Zhang Huifen Inventor after: Wei Yajun Inventor after: Ming Liang Inventor after: Fu Ke Inventor after: Li Xiang Inventor after: Xiao Xifeng Inventor after: Wang Shixin Inventor after: Guo Yao Inventor before: Xiao Xifeng Inventor before: Zhang Huifen Inventor before: Wang Shixin Inventor before: Guo Yao Inventor before: Huang Tantan |
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Effective date of registration: 20170324 Address after: 272100 Jining high tech Development Zone, Shandong Torch Road, No. 28 Applicant after: Jining Power Supply Company State Grid Shandong Electric Power Co., Ltd. Applicant after: University of Jinan Address before: The central nanxinzhuang Ji'nan Road, No. 336 of 250022 cities in Shandong Province Applicant before: University of Jinan |
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