CN108872799A - Active power distribution network fault section location method and system based on forward-order current fault component - Google Patents
Active power distribution network fault section location method and system based on forward-order current fault component 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The active power distribution network fault section location method and system based on forward-order current fault component that the invention discloses a kind of, including：Acquisition is flowed through by the three-phase current at the switch of protection feeder line two sides in real time；After detecting that feeder line breaks down, it is calculated by the amplitude and phase of the forward-order current fault component of protection feeder line two sides；Calculate starting amount and braking threshold；When the starting amount of the continuous n sampled point of certain section of route is greater than braking threshold, determine the section for fault section.Simulation analysis shows the power distribution network for the DG containing different type, and when different types of failure occurs for different location, the present invention can correctly identify fault section, and have many advantages, such as to be resistant to transition resistance ability by force, it is high sensitivity, highly reliable.In addition the present invention is not necessarily to failure line selection and information of voltage, there is good economy.
Description
Technical field
The present invention relates to active power distribution network fault section location technical fields, more particularly to one kind to be based on forward-order current failure
The active power distribution network fault section location method and system of component.
Background technique
With the exhaustion of global fossil energy and the enhancing of various countries' environmental consciousness and distributed generation technology and electric power electricity
The development of sub- technology, the distributed generation resource (DG) based on the cleaning type energy are largely accessed power distribution network.International big electricity in 2008
The concept of active power distribution network (ADN) is proposed in net meeting (CIGRE), i.e., locally accesses distributed generation resource, this quilt in power distribution network
It is considered the direction of the following power distribution network development.DG power supply has many advantages, such as that low energy consumption, small investment, flexibility and reliability, but its access changes
The grid structure for having become conventional electrical distribution net, be allowed to from the Radial network of traditional single-ended power become both-end or multiterminal power supply answer
Miscellaneous network, network structure, the method for operation, direction of tide will all change, and traditional power distribution network three-step charging will
No longer it is applicable in.
Distributed generation resource huge number in active power distribution network, is influenced by control mode, different types of distribution after failure
The fault characteristic of power supply is also not quite similar.According to grid-connected mode difference, DG can be divided into can be with the electric machinery power supply of direct grid-connected
(RTDG) and grid-connected inversion class power supply (IIDG) after inversion, boosting is needed.Compared with electric machinery DG, after inversion class DG failure
Feature is increasingly complex.Current grid-connected prescribed requirement IIDG should preferentially be exported in Distribution Network Failure it is idle with support system voltage,
This is influenced the electric current for exporting IIDG by grid entry point voltage, has biggish randomness, and then conventional electric current is caused to be protected
Shield is difficult to determine suitable setting valve, influences the reliability and sensitivity of protection.It is therefore proposed that suitable for the DG's containing various types
Fault Section Location of Distribution Network has become the important topic of active power distribution network protection.
Positive and negative, the zero-sequence component generated when electric system is broken down includes a large amount of fault messages, the spy of these electrical quantity
Sign can be adopted to carry out fault section location to active power distribution network.Each electrical order components and DG when domestic and foreign scholars are to failure at present
Control strategy carried out a series of research, and propose some fault section location methods suitable for active power distribution network.
The prior art proposes a kind of pilot protection scheme based on forward-order current phase angle Sudden Changing Rate direction, pacifies in each protection
The change direction for comparing failure front and back current phase angle at dress, exports " 1 " when current phase angle difference is positive value, exported when being negative value "-
1 ", it is troubles inside the sample space when opposite that both ends protection output result, which is external area error when identical,.The program requires communication channel lower
And information of voltage is not needed, but be only applicable to the active power distribution network of the DG containing motor-type.
The prior art proposes a kind of active power distribution network pilot protection scheme using protection circuit both ends current amplitude.It should
Scheme is merely with current magnitude information, and principle is simple and sensitivity with higher, but restrictive condition is more when applying, and only fits
Active power distribution network that is lower for DG permeability and being IIDG.
The prior art is proposed and a kind of is existed using the Sequence Differential impedance of route both ends based on the analysis to IIDG fault characteristic
Amplitude difference when internal fault external fault carries out the active power distribution network protection scheme of fault identification.The protection scheme is not by back side IIDG
The influence of fault characteristic and be not necessarily to both ends synchronal data sampling, but need a protection installation place installation voltage transformer, at
This is higher, does not have the condition applied in existing power distribution network.
Analysis of the prior art based on differential protection synchronous error proposes a kind of active power distribution network based on phase changing capacity
Pilot protection scheme determines fault section according to variable quantity of the route both ends current phase angle before and after failure, and this method is reasonable
Influence of the synchronous error to protection braking characteristic is avoided, but does not consider that low voltage crossing characteristic and transition resistance export IIDG
Fault current caused by influence.
Network structure of the prior art based on specific active power distribution network, proposes the protection scheme of hierarchical classification.The program
It is fast and reliable, but there is limitation, it is effective just for specific network structure.
The prior art protects installation place using when two-phase phase fault and three phase short circuit fault occurring at different location
Positive sequence voltage and flow through protection forward-order current between relationship, construct be suitable for the adaptive positive sequence of power distribution network containing IIDG
Current quick scheme.The program expands the effective protection range of existing protection, improves the selection of original protection scheme
Property and sensitivity.But the program increases protection element, economy is poor；Scheme adjusting is complicated and has ignored transition resistance
It influences, when fault resistance is larger, reliability is difficult to ensure.
The prior art flows through the forward-order current of protection when having studied power distribution network positive direction and reverse direction failure and protection is installed
The phase relation of voltage before place's failure proposes a kind of direction member based on voltage phase information before positive sequence fault current and failure
Part new principle.The problem of principle improves the reliability of directional element, avoids conventional power element voltage dead zone, but need
It installs voltage transformer additional at each protection, and has ignored influence of the through current to fault phase.
It can be seen that there is no merely with current information in existing active power distribution network fault section location and protection scheme
And the reliable scheme not influenced by factors such as transition resistance, DG permeability, DG types.
Summary of the invention
To solve the above-mentioned problems, the invention proposes a kind of active power distribution network failures based on forward-order current fault component
Section Location and system, this method, which is utilized, constructs starting amount by the amplitude of protection feeder line both ends forward-order current fault component,
Braking threshold is constructed using by the phase difference of protection feeder line both ends forward-order current fault component.It is fixed with other active power distribution network failures
Position method is compared, and this method is merely with forward-order current information, without installing voltage transformer, without Fault Phase Selection；To containing inverse
The power distribution network of modification DG and motor-type DG are applicable；And there is high sensitivity, quick action can reflect all failure classes
Type is resistant to the advantages that transition resistance ability is strong not by loading effects.
To achieve the goals above, the present invention adopts the following technical scheme that：
Disclosed a kind of active power distribution network fault section location based on forward-order current fault component in some embodiments
Method, including：
Acquisition is flowed through by the three-phase current at two end switch of protection feeder line in real time；
After detecting that feeder line breaks down, calculated separately by Fast Fourier Transform (FFT) by protection feeder line both ends
Forward-order current amplitude and phase, and further obtain being protected the amplitude and phase of feeder line both ends forward-order current fault component
Position；
By the forward-order current fault component amplitude respectively obtained by protection feeder line both ends and phase information, sampling instant
Information is transmitted to opposite end by optical-fibre channel；
Starting amount is calculated according to by the amplitude information of protection feeder line both ends forward-order current fault component；
Braking threshold is calculated according to by the phase information of protection feeder line both ends forward-order current fault component；
When the starting amount of the continuous n sampled point of certain section of feeder line is greater than braking threshold, determine the section for faulty section
Section；Wherein, n is setting value.
Further, obtain being protected the amplitude and phase of feeder line both ends forward-order current fault component, specially：
By the amplitude of protection feeder line both ends forward-order current fault component be equal to current time forward-order current amplitude with
The difference of forward-order current amplitude before one power frequency period；
By the phase of protection feeder line both ends forward-order current fault component be equal to current time forward-order current phase with
The difference of forward-order current phase before one power frequency period.
Further, starting amount is calculated according to by the amplitude information of protection feeder line both ends forward-order current fault component,
Specially：Starting amount is equal to by the ratio of the absolute value of protection feeder line both ends forward-order current fault component amplitude.
Further, braking threshold is calculated according to by the phase information of protection feeder line both ends forward-order current fault component
Value, specially：
Wherein, | θmn1| for by protection feeder line both ends forward-order current fault component phase absolute value of the difference.
Further, the value range of n is 5-10, and the value of n is bigger, and protection reliability is higher, but will increase simultaneously dynamic
Make the time.
Disclosed a kind of active power distribution network fault section location based on forward-order current fault component in some embodiments
System, including server, the server include memory, processor and storage on a memory and can run on a processor
Computer program, the processor realizes above-mentioned method when executing described program.
Disclosed a kind of computer readable storage medium in some embodiments, is stored thereon with computer program, the journey
Above-mentioned method is executed when sequence is executed by processor.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) merely with current information can positioning failure section, without protection installation place install additional voltage transformer, also without
Need Fault Phase Selection, economy with higher；
(2) fully demonstrated excellent performance of the positive sequence fault current in relay protection, can it is reliable, quickly locate it is each
The failure of seed type is not influenced by abort situation, load current and DG capacity, tolerance transition resistance ability it is strong, and have compared with
High sensitivity；
(3) applicable to the power distribution network containing inverse distributed power and motor-type distributed generation resource, have good
Adaptability；
(4) recognition methods principle is simple, clear, and identification is accurate, is easy to Project Realization.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is simple active power distribution network schematic diagram；
Positive sequence network figure when Fig. 2 (a) is active power distribution network failure；
Fig. 2 (b) is the positive sequence network figure before active power distribution network failure occurs；
Fig. 2 (c) is the positive sequence network figure of active power distribution network failure additivity；
Fig. 3 is the active power distribution network failure additivity positive sequence network figure containing IIDG；
Failure additivity positive sequence network figure when Fig. 4 is the active power distribution network external area error containing IIDG；
Fig. 5 is active power distribution network simulation model schematic diagram；
Fig. 6 (a) is the change curve that braking threshold and current amplitude ratio when line to line fault occur for f1 point；
Fig. 6 (b) is the change curve that braking threshold and current amplitude ratio when three-phase shortcircuit occur for f1 point；
Fig. 6 (c) is the change curve that braking threshold and current amplitude ratio when two-phase grounding fault occur for f1 point；
Fig. 6 (d) is the change that braking threshold and current amplitude ratio when containing 10 Ω transition resistance two-phase grounding fault occur for f1 point
Change curve；
Fig. 7 is fault section location method flow diagram.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
The active power distribution network fault section location method based on forward-order current fault component that the invention discloses a kind of is such as schemed
Shown in 7, include the following steps：
(1) acquisition is flowed through by a, b, c three-phase current at two end switch of protection feeder line in real time；
(2) when detecting that phase current mutates in feeder line, it is considered as failure, is calculated separately by Fast Fourier Transform (FFT)
By the forward-order current amplitude and phase at protection feeder line both ends, and further obtain the amplitude of both ends forward-order current fault component
With phase；
(3) the forward-order current fault component amplitude that feeder line both ends respectively obtain is led to phase information, sampling instant information
It crosses optical-fibre channel and is mutually transmitted to opposite end；
(4) starting amount is calculated by the amplitude information by protection feeder line both ends forward-order current fault component that step (3) obtains；
(5) braking threshold is calculated by the phase information by protection feeder line both ends forward-order current fault component that step (3) obtains
Value；
(6) size for comparing the starting amount that synchronization is obtained by step (4) and the braking threshold that step (5) obtain, when
When the starting amount of the continuous n sampled point of certain section of route is greater than braking threshold, determine the section for fault section.
Wherein, in step (4), the original of protection starting amount is calculated based on route both ends forward-order current fault component amplitude information
Reason is：
By taking active power distribution network shown in FIG. 1 as an example, when breaking down inside feeder line MN, it is contemplated that system pressure regulating, frequency modulation
Process is constrained by time constant, the system in the short time can be equivalent to linear system, the positive sequence compound sequence network after failure by
Superposition theorem can be divided into network and super-imposed networks before failure occurs.If the DG in power distribution network is motor-type DG, therefore
Such as Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c) are shown respectively for positive sequence network and positive sequence super-imposed networks before positive sequence network, failure after barrier.
In figureRespectively system equivalent potential and DG equivalence potential, Zm1、Zn1、Zmf1、Znf1Respectively the end M is left
The positive sequence equivalent impedance of side, N-terminal right side, the end M to fault point, fault point to N-terminal,The electricity at prior fault point occurs for failure
Pressure,Respectively the end M, N-terminal electric current positive sequence fault component, Δ Z be failure additional impedance, value is by fault type
It determines.
When distributed generation resource is IIDG, it is contemplated that the randomness that IIDG contributes after failure cannot be equivalent to one
Voltage source is connected with an impedance.Since the fault current of IIDG output is related with grid entry point Voltage Drop degree, therefore existing
Research in be equivalent to a voltage-controlled type current source mostly.
The active power distribution network positive sequence failure that distributed generation resource is IIDG adds sequence net as shown in figure 3, in figureFor IIDG
Export the positive sequence fault component of electric current.The electric current in the test point of section both ends can will be protected to be divided into two parts by superposition theorem：One
Part is generated by failure additional potential, and a part is generated by the equivalent current source of IIDG.The positive sequence fault component of both ends electric current can
It is expressed as
In formula, Zms1=Zm1+Zmf1,The positive sequence fault component of electric current, K are provided for additional potentialdgForElectric current
Distribution coefficient.
Due to being influenced by control strategy, the short circuit current provided after inverse type DG failure usually not more than its specified electricity
Twice of stream, when failure occurs at the upstream DG, the short circuit current that DG is provided is much smaller than system side,Size relative toIt is negligible.The forward-order current fault component amplitude that protection circuit M flows through at end at this timeMuch larger than route N-terminal stream
The forward-order current fault component amplitude crossedTherefore it can pass through the positive sequence fault component amplitude criterion of construction route both ends electric current
Carry out positioning failure section.Definition protection starting amount is the forward-order current fault component Amplitude Ration I at route both endsr
For fault section, the fault current at route both ends is provided by system power supply and IIDG respectively, amplitude difference compared with
Greatly, IrAlso larger.
For non-faulting section, as shown in figure 4, the fault current at route both ends is provided by system power supply or IIDG,
Amplitude difference is smaller, IrSize close to 1.
For the above analysis it is found that in the power distribution network containing IIDG, the positive sequence failure of fault section and non-faulting section is electric
Flowing Amplitude Ration, there are notable differences, therefore this method uses it as protection starting amount.However matching for DG containing motor-type (RTDG)
Power grid can not be accurately positioned fault section merely with current amplitude in all cases, need to introduce current phase information.
In step (5), the phase information based on route both ends forward-order current fault component calculates the original of protection braking threshold
Reason is：
Failure is added shown in sequence net such as Fig. 2 (c) when active power distribution network troubles inside the sample space, route both ends forward-order current fault component
Direction be to flow to bus from route, phase difference is only determined by the impedance angle of two-termial line, and value is close to 0；External area error
When, route both ends forward-order current fault component it is contrary, phase difference is close to 180 °.This method is constructed using this feature
Braking threshold, setting braking threshold are Kset
In formula, | θmn1| it is both ends forward-order current fault component phase absolute value of the difference.
For motor-type DG, fault section | θmn1| ≈ 0, at this time cos (| 180- θmn1|) ≈ -1, Kset≈ 0 brakes threshold
It is worth minimum, to protect when can effectively improve troubles inside the sample space sensitivity；Non-faulting section | θmn1| 180 ° of ≈, cos (| 180- θmn1
|) ≈ 1, Kset≈+∞, braking threshold is very big, the safety protected when can effectively improve external area error.
For the power distribution network containing IIDG, due to after failure IIDG contribute there is randomness, fault section | θmn1| value
Range is larger, only relies on current phase and is difficult to that fault section is accurately positioned, and needs to introduce the letter of current amplitude obtained in step (4)
Breath.
In step (6), the principle using the amplitude positioning failure section of forward-order current fault component is：
In order to increase the reliability of protection, the starting amount that the continuous n sampled point of certain section meets is set and is greater than braking threshold
When, then determine the section for fault section.Protection act criterion is
Ir> Kset
For motor-type DG, when fault point is located at the upstream DG and distance DG closer, it may appear that the lesser situation of starting amount,
But since the braking threshold of fault section at this time is close to 0, so still ensuring that the correctness of fault location.
For inverse type DG, due to the uncertainty contributed after its failure, it may appear that fault section braking threshold is slightly larger
Situation, but since the starting amount of fault section at this time is bigger, so still ensuring that the correctness of fault location.
Using the power distribution network simulation model of PSCAD building DG containing different type, fault section location method is emulated
Verifying：
1) model is established
Simulation model structure is as shown in Figure 2.System reference voltage is 10.5kV, system equivalent internal resistance Zs=j0.14 Ω, line
Road parameter r1=0.13 Ω/km, x1=0.402 Ω/km.DG rated power is 4MW, and the impedance of route unit length is：R=
0.13 Ω/km, X=0.402 Ω/km, the length of route AB, BC, CD, DE are respectively 3,2,2,3km；The volume of each load on feeder line
Determining power is 4MVA, and power factor is 0.9.Corresponding protection is configured at breaker CBi.Fault point f1, f2 distinguish position
In feeder line BC, DE, f3 is located on another feeder line.
2) typical fault emulates
A) the distribution network failure emulation containing IIDG
IIDG is set by DG, when line to line fault, three-phase shortcircuit, two-phase grounding fault and through 10 Ω transition electricity occur for f1 point
When the two-phase grounding fault of resistance, failure occur front and back braking threshold and current amplitude than variation respectively as Fig. 6 (a), Fig. 6 (b),
Shown in Fig. 6 (c) and Fig. 6 (d).Generation when failure is arranged at 0.2s takes the time observation of each cycle in front and back.
It is found that line to line fault, three-phase shortcircuit or two-phase grounding fault no matter occurs, failure occurs analysis chart 6 (a)-(d)
In 5ms afterwards, braking threshold is dropped rapidly to 0, and at the same time, electric current positive sequence fault component Amplitude Ration increases rapidly.When event
When barrier is metallicity failure, current amplitude is more than braking threshold than after the failure occurred 3ms, and contains 10 Ω transition resistances
Shi Zewei 4ms, it is seen that this method in all cases can quick acting, and have stronger tolerance transition resistance ability.
Various types of failures are respectively set at f1, f2, f3 respectively, wherein consider that failure is located at when f1, f2 point failure
Route head end and two kinds of end situation.As shown in table 1- table 3, all data therein is taken from after failure simulation result
10ms。
Simulation result when 1 fault point of table is f1
Simulation result when 2 fault point of table is f2
Simulation result when 3 fault point of table is f3
By table 1, table 2 and 3 simulation result of table it is found that no matter in route head end or the what type of event of line end generation
Barrier, has that forward-order current fault component Amplitude Ration is larger, and braking threshold is smaller in fault section, and starting amount is greater than braking threshold
The case where；And having that forward-order current fault component amplitude com parison is small, and braking threshold is larger in non-faulting section, starting amount is small
In the braking threshold the case where.It is worth noting that, compared to route head end, when line end breaks down, fault section is being just
Sequence current failure component amplitude is smaller, but still can guarantee that starting amount is greater than braking threshold；In addition, through 10 Ω transition electricity
When hindering ground short circuit, it will appear the larger feelings for causing braking threshold to increase of forward-order current fault component phase difference in fault section
Condition, but still can guarantee that braking threshold is less than starting amount.Therefore, for the power distribution network containing IIDG, the present invention mentioned based on
Fault section can be accurately positioned in the fault section location method of forward-order current fault component.
B) the distribution network failure emulation containing RTDG
RTDG is set by DG, various types of failures are respectively set at f1, f2, f3 respectively, wherein f1, f2 point failure
When consider failure be located at route head end and two kinds of end situation.As shown in table 4- table 6, all data therein takes simulation result
The 10ms from after failure.
Simulation result when 4 fault point of table is f1
Simulation result when 5 fault point of table is f2
Simulation result when 6 fault point of table is f3
From table 4, table 5 and 6 simulation result of table it is found that no matter in route head end or the what type of event of line end generation
Barrier, has that forward-order current fault component Amplitude Ration is larger, and braking threshold is smaller in fault section, and starting amount is greater than braking threshold
The case where；And having that forward-order current fault component amplitude com parison is small, and braking threshold is larger in non-faulting section, starting amount is small
In the braking threshold the case where.It is worth noting that, when fault point f1 is located at place line end, fault point far from downstream DG very
Closely, the forward-order current fault component Amplitude Ration of fault section is less than non-faulting section, but due to fault section and non-faulting area
Section braking threshold respectively close to 0 with greatly, so still be able to guarantee fault section starting amount be greater than braking threshold and
The starting amount of non-faulting section is less than braking threshold.Therefore, for the power distribution network containing RTDG, the present invention is mentioned electric based on positive sequence
Fault section can be accurately positioned in the Fault Locating Method of the vertical connection of stream fault component.
By the above simulation result it is found that the fault section location method proposed by the present invention based on forward-order current fault component
It can be suitable for the power distribution network of the DG containing various types, and not influenced by fault type, there is stronger tolerance transition resistance ability
And higher reliability and sensitivity.
The present invention is using the amplitude of feeder line both ends forward-order current fault component and the feature of phase, first with forward-order current event
The amplitude information for hindering component constructs starting amount, constructs braking threshold using the phase difference of forward-order current fault component, then pass through ratio
The starting amount of more each intra-segment and the size positioning failure section of braking threshold.PSCAD simulation result shows in various events
Under the conditions of barrier, the present invention can be properly positioned fault section in 10ms, and have stronger tolerance transition resistance ability, braking
The addition of threshold value substantially increases the reliability and sensitivity of the invention.In addition, the invention is merely with forward-order current fault component
Information does not need Fault Phase Selection, installs voltage transformer additional without in protection installation place, has good economy.
In other embodiment, the present invention further discloses a kind of based on the active of forward-order current fault component
Distribution network failure section positioning system, including：Server, the server include memory, processor and are stored in memory
Computer program that is upper and can running on a processor, the processor realize following steps when executing described program：
Acquisition is flowed through by the three-phase current at two end switch of protection feeder line in real time；
After detecting that feeder line breaks down, calculated separately by Fast Fourier Transform (FFT) by protection feeder line both ends
Forward-order current amplitude and phase, and further obtain being protected the amplitude and phase of feeder line both ends forward-order current fault component
Position；
By the forward-order current fault component amplitude respectively obtained by protection feeder line both ends and phase information, sampling instant
Information is transmitted to opposite end by optical-fibre channel；
Starting amount is calculated according to by the amplitude information of protection feeder line both ends forward-order current fault component；
Braking threshold is calculated according to by the phase information of protection feeder line both ends forward-order current fault component；
When the starting amount of the continuous n sampled point of certain section of feeder line is greater than braking threshold, determine the section for faulty section
Section；Wherein, n is setting value.
Wherein, the forward-order current width at current time is equal to by the amplitude of protection feeder line both ends forward-order current fault component
The difference of forward-order current amplitude before value and a power frequency period；
By the phase of protection feeder line both ends forward-order current fault component be equal to current time forward-order current phase with
The difference of forward-order current phase before one power frequency period.
Starting amount is equal to by the ratio of the absolute value of protection feeder line both ends forward-order current fault component amplitude.
Braking thresholdWherein, | θmn1| for by the event of protection feeder line both ends forward-order current
Hinder component phase absolute value of the difference.
In other embodiment, the present invention further discloses a kind of computer readable storage mediums, deposit thereon
Computer program is contained, which is executed by processor following steps：
Acquisition is flowed through by the three-phase current at two end switch of protection feeder line in real time；
After detecting that feeder line breaks down, calculated separately by Fast Fourier Transform (FFT) by protection feeder line both ends
Forward-order current amplitude and phase, and further obtain being protected the amplitude and phase of feeder line both ends forward-order current fault component
Position；
By the forward-order current fault component amplitude respectively obtained by protection feeder line both ends and phase information, sampling instant
Information is transmitted to opposite end by optical-fibre channel；
Starting amount is calculated according to by the amplitude information of protection feeder line both ends forward-order current fault component；
Braking threshold is calculated according to by the phase information of protection feeder line both ends forward-order current fault component；
When the starting amount of the continuous n sampled point of certain section of feeder line is greater than braking threshold, determine the section for faulty section
Section；Wherein, n is setting value.
Wherein, the forward-order current width at current time is equal to by the amplitude of protection feeder line both ends forward-order current fault component
The difference of forward-order current amplitude before value and a power frequency period；
By the phase of protection feeder line both ends forward-order current fault component be equal to current time forward-order current phase with
The difference of forward-order current phase before one power frequency period.
Starting amount is equal to by the ratio of the absolute value of protection feeder line both ends forward-order current fault component amplitude.
Braking thresholdWherein, | θmn1| for by the event of protection feeder line both ends forward-order current
Hinder component phase absolute value of the difference.
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 (7)
1. a kind of active power distribution network fault section location method based on forward-order current fault component, which is characterized in that including：
Acquisition is flowed through by the three-phase current at two end switch of protection feeder line in real time；
After detecting that feeder line breaks down, calculated separately by Fast Fourier Transform (FFT) by the positive sequence at protection feeder line both ends
Current amplitude and phase, and further obtain being protected the amplitude and phase of feeder line both ends forward-order current fault component；
By the forward-order current fault component amplitude respectively obtained by protection feeder line both ends and phase information, sampling instant information
Opposite end is transmitted to by optical-fibre channel；
Starting amount is calculated according to by the amplitude information of protection feeder line both ends forward-order current fault component；
Braking threshold is calculated according to by the phase information of protection feeder line both ends forward-order current fault component；
When the starting amount of the continuous n sampled point of certain section of feeder line is greater than braking threshold, determine the section for fault section；Its
In, n is setting value.
2. a kind of active power distribution network fault section location method based on forward-order current fault component as described in claim 1,
It is characterized in that, obtaining being protected the amplitude and phase of feeder line both ends forward-order current fault component, specially：
By the amplitude of protection feeder line both ends forward-order current fault component equal to the forward-order current amplitude at current time and one
The difference of forward-order current amplitude before power frequency period；
By the phase of protection feeder line both ends forward-order current fault component equal to the forward-order current phase at current time and one
The difference of forward-order current phase before power frequency period.
3. a kind of active power distribution network fault section location method based on forward-order current fault component as described in claim 1,
It is characterized in that, calculating starting amount according to by the amplitude information of protection feeder line both ends forward-order current fault component, specially：
Starting amount is equal to by the ratio of the absolute value of protection feeder line both ends forward-order current fault component amplitude.
4. a kind of active power distribution network fault section location method based on forward-order current fault component as described in claim 1,
It is characterized in that, calculating braking threshold according to by the phase information of protection feeder line both ends forward-order current fault component, specifically
For：
Wherein, | θmn1| for by protection feeder line both ends forward-order current fault component phase absolute value of the difference.
5. a kind of active power distribution network fault section location method based on forward-order current fault component as described in claim 1,
It is characterized in that, the value range of n is 5-10, the value of n is bigger, and protection reliability is higher, but will increase actuation time simultaneously.
6. a kind of active power distribution network fault section location system based on forward-order current fault component, which is characterized in that including clothes
Be engaged in device, the server include memory, processor and storage on a memory and the computer journey that can run on a processor
Sequence, the processor realize the described in any item methods of claim 1-4 when executing described program.
7. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
Perform claim requires the described in any item methods of 1-4 when row.
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