CN106501667A - 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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- 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
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a kind of fault-line selecting method of single-phase wire break containing distributed power distribution network, including：Application symmetrical component method calculates the negative-sequence current of each feeder line；EMD decomposition is carried out to the negative-sequence current of each feeder line, intrinsic modal components IMF of each rank are obtained；Hilbert conversion is carried out respectively to intrinsic modal components IMF of each rank, its corresponding instantaneous amplitude waveform is obtained；On the basis of there is the moment by failure, calculate respectively each feeder line set intrinsic modal components IMF of exponent number before failure with failure after the instantaneous amplitude sum of each m cycle and the variable quantity of the instantaneous amplitude sum after setting cycle；Size according to variable quantity judges disconnection fault circuit.The present invention protects the variation characteristic of each electric parameters in installation place after analyzing the distribution line of consideration distributed power source single-phase wire break failure occurs, and proposes breaking protection criterion, amplifies the characteristic quantity after failure occurs, and reaches the purpose of reliable detection failure.
Description
Technical field
A kind of the present invention relates to distribution network fault line selection technical field, more particularly to conventional electrical distribution net single-phase wire break fault-line selecting method.
Background technology
The distributed power source of Small And Medium Capacity is applied in power distribution network more and more widely, on the one hand increased electrical network economy and
Flexibility, while power supply reliability also to electrical network, relay protection etc. bring new problem.After distributed power source accesses power distribution network,
Impact will be produced on the size of the voltage and current at circuit two ends.After breaking down, the voltage of protection installation place is even more affected
And size of current, original Protection criteria and failure judgment method may be caused no longer to be suitable for.Therefore to matching somebody with somebody containing distributed power source
After electric line breaks down, the variation characteristic of system is analyzed and proposes corresponding Protection criteria and seems necessary.
In order to solve this problem, colleges and universities and scientific research institutions propose various counter-measures from different aspect.University Of Tianjin is theoretically
Corresponding short circuit current flow expression formula when breaking down after distributed power source accesses power distribution network is derived, and which is to protection and reclosing
Impact, the self-adaptive current and on the basis of existing self-adaptive current fast tripping protection, to the distribution system containing distributed power source
Quick-break current protection is adjusted again；South China Science ＆ Engineering University proposes the distribution network failure analysis method of meter and DG control characteristics,
Distributed electrical source model under the conditions of setting up symmetric fault and under the conditions of unbalanced fault, simulation results show symmetric fault with non-
Symmetric fault current calculation method；Beijing Jiaotong University derived in theory fault current and DG capacity, DG access point positions with
And the relation of abort situation, quantitative analysis simultaneously demonstrates impacts of the DG to power distribution network current protection and reclosing, and propose to be applied to
The distribution protection scheme that many DG are accessed；Southwest Jiaotong University analyzes common several distributed electrical Source Types and Equivalent Model,
Three short circuit current value expression is derived, impact of the distributed power source to original relaying configuration is drawn.
However, the studies above mostly concentrates on the impact analysis based on distributed power source under short circuit condition to protecting, and distributed electrical
Impact after the access of source to single-phase wire break failure, not yet someone are touched upon.In order to adapt to the demand for development of intelligent power distribution network construction, carry
High power supply reliability, plays the economy that distributed power source accesses electrical network, to greatest extent to the distribution line containing distributed power source
Single-phase wire break failure should be furtherd investigate.
Content of the invention
The purpose of the present invention is exactly to solve an above-mentioned difficult problem, there is provided a kind of failure of single-phase wire break containing distributed power distribution network is selected
Line method, distribution line of the method by analysis containing distributed power source protect each electric parameters in installation place after there is single-phase wire break failure
Variation characteristic, propose breaking protection criterion, by processing to criterion, amplify failure occur after characteristic quantity, reaching can
By detecting the purpose of failure.
For achieving 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, including：
(1) assume that substation bus bar synteny there are n bar feeder lines, gather the three-phase phase current in each feeder line exit, calculate each feeder line
Negative-sequence current；
(2) amplitude of the negative-sequence current of calculated each feeder line and negative phase-sequence setting valve are compared, when the amplitude of negative-sequence current
More than starting step (3) during negative phase-sequence setting valve；Otherwise, return to step (1)；
(3) EMD decomposition is carried out to the negative-sequence current of each feeder line, obtains intrinsic modal components IMF of each rank；And calculate each rank eigen mode
The corresponding instantaneous amplitude waveforms of state component IMF；
(4) on the basis of there is the moment by failure, calculate respectively each feeder line set intrinsic modal components IMF of exponent number before failure with
The instantaneous amplitude sum of the later each m cycle of setting cycle and the variable quantity of the instantaneous amplitude sum after failure；
(5) according to each feeder line before failure, after failure the variable quantity of the instantaneous amplitude sum of each m cycle after setting cycle
Size judges disconnection fault circuit.
Further, in step (2), negative phase-sequence setting valve is produced according on this feeder line when escaping other feeder line single-phase wire break failures
Raw negative-sequence current is adjusted.
Further, the negative phase-sequence setting valve I2.set=kk|i2|；Wherein, kkFor safety factor.
Further, Hilbert conversion is carried out respectively to intrinsic modal components IMF of each rank in step (3), obtains which corresponding
Instantaneous amplitude waveform.
Further, in step (4), intrinsic modal components IMF of each feeder line second order are calculated respectively2Before failure and after failure
Instantaneous amplitude sum.
Further, in step (4), setting cycle is 6 cycles or 7 cycles.
Further, in step (5), by the wink of each feeder line each m cycle after setting cycle before failure, after failure
When amplitude sum variable quantity descending be ranked up, choose first three feeder line as doubtful disconnection fault circuit.
Further, in step (5), by the wink of each feeder line each m cycle after setting cycle before failure, after failure
When amplitude sum variable quantity descending be ranked up, it is disconnection fault circuit to choose variable quantity the maximum.
Beneficial effects of the present invention：
In the distribution line single-phase wire break failure line selection containing distributed power source, with negative-sequence current and negative-sequence current Hilbert-xanthochromia
The intrinsic modal components of the second order that changes are bonded route selection criterion, have following application effect：
(1) distributed electrical source model meter and the impact of control strategy, relative to the equivalent method in constant potential source, more can be correct
Reality output characteristic before and after simulation distribution formula power failure, is a kind of accurate equivalent way.
(2) can just detect just with the current signal that installation place is protected after failure and be out of order, it is not necessary to voltage signal, be also not required to
The current signal of other positions is wanted, method is simple and convenient, reduce the installing requirement of voltage transformer summation current transformer；With base
Compare in the protection of multiple spot information content, it is not necessary to extra communication system, with obvious economy.
(3) the variable quantity increase before and after failure using criterion characteristic quantity after Hilbert-Huang transform algorithm process, and can be with non-event
Barrier circuit is reliably distinguished, and sensitivity is high.And the numerical value of adjustment m, sensitivity can be adjusted.M values are bigger, and sensitivity is higher.
(4) Protection criteria and detection algorithm can be suitably used for the distribution line containing distributed power source, and flexibility is good, and not by neutrality
The impact of the point method of operation.
Description of the drawings
Fig. 1 is the 10kV distribution system structure charts of simplified consideration distributed power source；
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 models containing distributed power source；
Fig. 5 (a) is faulty line L1 negative-sequence current waveforms；
Fig. 5 (b) non-fault line L2 negative-sequence current waveforms；
Instantaneous amplitudes of the Fig. 6 (a) for negative-sequence current IMF2；
Fig. 6 (b) be failure before and failure after negative-sequence current SIMF.
Specific embodiment：
The present invention is described in detail below in conjunction with the accompanying drawings：
10kV distribution line single-phase wire breaks failure containing distributed power source can use the simplified system representation of accompanying drawing 1.SDG is distribution
Formula equivalent source, because inverse distributed power (IIDG) is most widely used, IIDG typically adopts electric current when being incorporated into the power networks
Type PQ control mode, SDG can be equivalent into a controlled current source, and are linked in circuit by feeder line.
Using failure mutually as analysis object, using boundary condition, the compound sequence network after there is single-phase wire break failure is drawn, can be regarded as
The superposition of the failure additivity after load condition and broken string before broken string；According to Kirchoff s voltage current law, failure is listed
The each sequence voltage in protection installation place under additivityWith each sequence electric currentEquation,
By which with failure before protect the sequence voltage that each sequence voltage electric current in installation place is overlapped after can calculating generation of being out of order With sequence electric currentBy sequence voltage and sequence electric current, the phase voltage of protection installation place can be calculated With phase current
Can be obtained by theory deduction result, after circuit occurs single-phase wire break failure, protect the negative-sequence current and forward-order current of installation place all
Change is generated, and equal in magnitude, in opposite direction.Negative-sequence current and forward-order current after failure is made up of two parts, main power source
The failure sequence electric current that the sequence electric current of offer and distributed power source are exported after a failure.The former is relevant with load character, the latter with point
The amount of capacity of cloth power supply, control strategy and on-position are relevant.Failure phase phase current vanishing, the phase of two non-faulting phases
Equal in magnitude, in opposite direction.The protection each sequence voltage in installation place and each phase voltage size direction are constant.
Power distribution network in actual motion typically with comprehensive load, therefore distributed power source amount of capacity and on-position true
In the case of fixed, the output current of distributed power source is mainly relevant with control strategy.The present invention is directed to PQ control modes, single-phase
After disconnection fault, grid-connected point voltage will appear from negative sequence component.System is changed into three-phase unsymmetrical winding, and depositing due to negative sequence component
Two double-frequency fluctuations will be produced in the active power and reactive power of the output of, distributed power source, and cause Voltage loop in double-closed-loop control defeated
The d shaft currents for going out are instructed with twice oscillation frequency, and PI controllers cannot carry out error free tracking to sinusoidal quantity, after failure occurs
Stable state is unable to reach, as shown in Figure 2.
After breaking down, the vibration of distributed power source active power of output and reactive power by cause to protect installation place phase current and
Sequence electric current also vibrates, and than failure before amplitude increase many.As phase current and forward-order current are existing one before failure
Fixed number value, and negative-sequence current is substantially zeroed before failure, variable quantity is bigger, therefore can choose negative-sequence current as single-phase wire break
Protection criteria.
Directly compare the negative-sequence current before and after failure occurs recognizing faulty line, sensitivity is sometimes not high enough.Therefore the present invention is adopted
Amplify indirectly fault characteristic value with digital processing method, improve the reliability and sensitivity of broken string route selection.
Hilbert-Huang transform is highly effective for non-fundamental frequency transient signal is processed.Prove through substantial amounts of experimental study, with tradition
Power distribution network is compared, and after failure occurs, transient process of the control loop containing distributed power source through 6-7 cycle reaches just can output
To vibration stable state.Vibration stable state has bigger amplitude than the negative-sequence current of transient process, and therefore the present invention is to protecting installation place event
Negative-sequence current before and after barrier carries out Hilbert-Huang transform, occurs as datum mark the moment using failure, chooses negative phase-sequence after 7 cycles
Before the instantaneous amplitude sum of m cycle of electric current and failure, the variable quantity of the instantaneous amplitude sum of m cycle of negative-sequence current is used as sentencing
According to realizing the highly sensitive power distribution network single-phase disconnection failure line selection containing distributed power source.
For achieving the above object, the distribution line single-phase wire break failure line selection flow process such as accompanying drawing containing distributed power source proposed by the present invention
Shown in 3.If substation bus bar synteny has n bar feeder lines, route selection process to be described in detail below：
(1) the three-phase phase current in each feeder line exit is gathered, applies symmetrical component method to calculate the negative-sequence current of each feeder line
i2k(k=1,2 ... n)；
(2) amplitude of the negative-sequence current of each feeder line | i2k| with negative phase-sequence setting valve I2.setRelatively, more than starting step during definite value (3), and
There is the moment as failure in this moment；Otherwise, step (1) is returned to.The setting valve is by escaping other feeder line single-phase wire break failures
When this feeder line on produce negative-sequence current i2Adjusted, i.e. I2.set=kk|i2|, wherein kkFor safety factor.
(3) the negative-sequence current i to each feeder line2kEMD decomposition is carried out, intrinsic modal components IMF of each rank are obtained.
(4) taking each rank IMF carries out Hilbert conversion, obtains its corresponding instantaneous amplitude waveform.Empirical tests find that second order is intrinsic
Modal components IMF2Instantaneous amplitude before failure and failure after change the most notable；
(5), on the basis of there is the moment by failure, each feeder line IMF is calculated respectively2.kBefore failure with failure after each m after 7 cycles
The instantaneous amplitude sum of individual cycle, computing formula are as follows：
Wherein：IMF for m cycle before kth bar feeder fault2Instantaneous amplitude sum；For kth bar
After feeder fault after 7 cycles m cycle IMF2Instantaneous amplitude sum；N is the sampling number in a cycle.Due to
Herein distribution system operating frequency is 50Hz, and sample frequency is set to 1000Hz, therefore j=20.Feeder line is selected in the present embodiment
After failure after 7 cycles m cycle IMF2Instantaneous amplitude sum, those skilled in the art select feeder line according to actual needs
After failure after 6 cycles (or after failure, set the IMF of m cycle after the quantity cycle2Instantaneous amplitude sum).
(6) IMF of m cycle after 7 cycles after m cycle and failure is calculated before each feeder fault2Instantaneous amplitude sum
Variation deltaIMF2.k.
There can be two ways to judge disconnection fault circuit：The first, ΔIMF2.kThe maximum is disconnection fault circuit；Second, respectively
The variation delta of feeder lineIMF2.kDescending order sequence is pressed, first three corresponding doubtful disconnection fault circuit.
In order to verify above-mentioned fault detection method, based on PSCAD/EMTDC establish as shown in Figure 4 containing distributed power source
10kV power distribution network simulation models, using MATLAB as Digital Signal Processing instrument.Wherein, L1 representing faults circuit,
L2 represents non-fault line；Distributed electrical Source Type is photo-voltaic power supply, using PQ control strategies；System institute on-load is permanent work(
Rate loads 2.5MW+0.2Mvar；During t=0.4s there is single-phase wire break failure in A phases.
Shown in the negative-sequence current such as accompanying drawing 5 (a), accompanying drawing 5 (b) of faulty line L1 and non-fault line L2.As seen from the figure,
After breaking down, the negative-sequence current on faulty line L2 produces mutation, and increment is stable after 6-7 cycle transient process,
Numerically much bigger than the negative-sequence current on L2 on non-fault line, can substantially distinguish with non-fault line.
In Hilbert-Huang transform, intrinsic modal components IMF of former ranks contain main fault message, and before choosing here, quadravalence enters
Row analysis.After circuit occurs single-phase wire break failure, EMD decomposition is carried out to the negative-sequence current for protecting installation place, is obtained some
Rank IMF.It is for example attached that the front quadravalence IMF of sampling plays instantaneous amplitude sum in a cycle after 7 cycles before failure with fault moment
Shown in Fig. 6 (b).As can be seen that before and after failure, intrinsic modal components IMF of second order2Instantaneous amplitude in a cycle
Sum changes the most obvious, therefore selects SIMF2Variable quantity as the characteristic quantity for judging single-phase wire break failure.
Intrinsic mode IMF of negative-sequence current second order2Instantaneous amplitude such as accompanying drawing 6 (a).As seen from the figure, after breaking down, IMF2
Instantaneous amplitude increases after 6-7 cycle rapidly.Therefore, failure of can sampling is risen m after 7 cycles with fault moment before occurring
The IMF of cycle2Instantaneous amplitude as research object, wherein m=1,2,3 ..., as shown in subordinate list 2.Taken in table altogether
Instantaneous amplitude sum in 1 to 10 cycle.From table, the periodicity for taking is more, the change of instantaneous amplitude sum before and after failure
Amount is bigger, protects sensitiveer and substantially big than the numerical value on non-fault line.
After breaking down, the variable quantity of the negative-sequence current of each circuit is as shown in appendix 1.By comparing the change of subordinate list 1 and subordinate list 2
Change amount (Δ) result understands that, if the variable quantity of negative-sequence current carries out route selection before and after directly occurring to failure, sensitivity can not show a candle to adopt
Use IMF2The variable quantity of instantaneous amplitude sum is high as criterion.It can be seen that, from intrinsic modal components IMF of negative-sequence current second order2?
The variable quantity of the instantaneous amplitude sum of several cycles after 7 cycles is played before failure with fault moment as judgement, and can realize can
Broken string circuit is selected by ground.
1 negative-sequence current of subordinate list | i2k| the change before and after failure
The instantaneous amplitude of intrinsic modal components IMF2 of 2 second order of subordinate list within the m cycle sampled value sum (wherein, m=1,2 ..., 10)
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not the limit to the scope of the present invention
System, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art need not pay
The various modifications that makes by going out creative work or deformation are 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, is characterized in that, including：
(1) assume that substation bus bar synteny there are n bar feeder lines, gather the three-phase phase current in each feeder line exit, calculate each feeder line
Negative-sequence current；
(2) amplitude of the negative-sequence current of calculated each feeder line and negative phase-sequence setting valve are compared, when the amplitude of negative-sequence current
More than starting step (3) during negative phase-sequence setting valve；Otherwise, return to step (1)；
(3) EMD decomposition is carried out to the negative-sequence current of each feeder line, obtains intrinsic modal components IMF of each rank；And calculate each rank eigen mode
The corresponding instantaneous amplitude waveforms of state component IMF；
(4) on the basis of there is the moment by failure, calculate respectively each feeder line set intrinsic modal components IMF of exponent number before failure with
The instantaneous amplitude sum of the later each m cycle of setting cycle and the variable quantity of the instantaneous amplitude sum after failure；
(5) according to each feeder line before failure, after failure the variable quantity of the instantaneous amplitude sum of each m cycle after setting cycle
Size judges disconnection fault circuit.
2. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
State in step (2), negative phase-sequence setting valve is carried out according to the negative-sequence current produced on this feeder line when escaping other feeder line single-phase wire break failures
Adjust.
3. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 2, is characterized in that, institute
State negative phase-sequence setting valve I2.set=kk|i2|；Wherein, kkFor safety factor.
4. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
Stating in step (3) carries out Hilbert conversion respectively to intrinsic modal components IMF of each rank, obtains its corresponding instantaneous amplitude waveform.
5. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
State in step (4), calculate intrinsic modal components IMF of each feeder line second order respectively2Instantaneous amplitude sum before failure and after failure.
6. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
State in step (4), setting cycle is 6 cycles or 7 cycles.
7. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
State in step (5), by the change of each feeder line instantaneous amplitude sum of each m cycle after setting cycle before failure, after failure
Amount is descending to be ranked up, and chooses first three feeder line as doubtful disconnection fault circuit.
8. one kind fault-line selecting method of single-phase wire break containing distributed power distribution network as claimed in claim 1, is characterized in that, institute
State in step (5), by the change of each feeder line instantaneous amplitude sum of each m cycle after setting cycle before failure, after failure
Amount is descending to be ranked up, and it is disconnection fault circuit to choose variable quantity the maximum.
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| 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 |
| CN110514954A (en) * | 2019-05-31 | 2019-11-29 | 国网辽宁省电力有限公司电力科学研究院 | A kind of feeder line fault diagnostic 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 |
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