CN109100610A - A kind of multiterminal element electric network fault direction determination process and system based on traveling wave transient - Google Patents
A kind of multiterminal element electric network fault direction determination process and system based on traveling wave transient Download PDFInfo
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- CN109100610A CN109100610A CN201810666241.8A CN201810666241A CN109100610A CN 109100610 A CN109100610 A CN 109100610A CN 201810666241 A CN201810666241 A CN 201810666241A CN 109100610 A CN109100610 A CN 109100610A
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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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Abstract
The invention discloses a kind of multiterminal element electric network fault direction determination process and system based on traveling wave transient, which comprises fault determining time t is arranged according to preset rules；It calculates in fault initiating time t0To fault determining time t, the backward-travelling wave of this route protection and multiple back side route protections；Preset one layer of wavelet coefficient in each backward-travelling wave is extracted as the high frequency transient component of corresponding backward-travelling wave using wavelet transform according to preset rules；Calculate the ratio of the corresponding high frequency transient component of the backward-travelling wave high frequency transient component corresponding with the backward-travelling wave of described route of multiple back side routes；And the fault direction of this route is judged according to the calculated result of the ratio；The method and system will not be by the influences of converter station, so that the judgement sensitivity and reliability of the DC grid fault direction significantly improve without relying on the additional conditions such as boundary element.
Description
Technical field
The present invention relates to technical field of electric power, more particularly, to a kind of multiterminal element power grid based on traveling wave transient
Fault direction judgment method and system.
Background technique
DC line protection is one of the key technology of direct current system development, wherein quickly, reliably judging that fault direction is
DC line quickly protects essential key link.However, traditional direction criterion based on current change quantity is by transition electricity
Resistance is affected and (may judge by accident when through great transition Resistance Fault)；Direction criterion based on current changing rate is then in long line
Due to being influenced positive negative variation occur by capacitance current in the case of road, fault direction can not be reliably judged.Multiterminal element is defeated
In electric system, when there are when the boundary elements such as direct current reactor, can rely on boundary element to generate forward and reverse failure at route both ends
Fault signature difference carry out fault direction judgement, such as a kind of patent " multiterminal flexible direct current power network line directional pilot protection side
Method " judgement based on reactor two sides transient voltage Amplitude Ration progress fault direction.However above-mentioned direction criterion depends on every
Direct current reactor is installed at DC line both ends, and route both ends are not available then without the case where boundary elements such as reactor.
The AC transmission system traveling wave direction criterion that document " research of Ultra-high-speed Transient-based Directional Relay " proposes is without line boundary member
Part can reliably judge fault direction based on forward and reverse traveling-wave ratio.However, this method can be applicable in AC system be because
AC transmission system is a linear system, and the traveling wave of power supply generation can be directly ignored in the analysis of failure sequence network.In direct current
In system, converter station control strategy can generate strong control response to failure after failure, and generation can not reliable analysis calculating
Additional traveling wave.I.e. direct current system is a nonlinearity system, is proposed premised on linear system in AC transmission system
The conventional direction criterion based on forward and reverse traveling-wave ratio will be difficult to reliably be applicable in.
Summary of the invention
It is unreliable or boundary need to be relied in order to solve judgement existing for background technique for fault direction in DC line
The additional conditions such as element can just carry out decision problem, the multiterminal element power grid event based on traveling wave transient that the present invention provides a kind of
Hinder direction determination process and system, the method and system according to the judgement of each direct current outlet backward-travelling wave ratio of bus rod, into
And obtain the judging result of DC grid fault direction；The method and system are without relying on the additional conditions such as boundary element also not
It will receive the influence of converter station, so that the judgement sensitivity and reliability of the DC grid fault direction significantly improve, it is described
A kind of multiterminal element electric network fault direction determination process and system based on traveling wave transient include:
According to preset rules, fault determining time t is set；
It calculates in fault initiating time t0To fault determining time t, this route protection and multiple back side route protections
Backward-travelling wave；
According to preset rules using wavelet transform extract preset one layer of wavelet coefficient in each backward-travelling wave as
The high frequency transient component of corresponding backward-travelling wave；
Calculate the backward-travelling wave pair of backward-travelling wave corresponding the high frequency transient component and described route of multiple back side routes
The ratio for the high frequency transient component answered；And the fault direction of this route is judged according to the calculated result of the ratio；
Further, the preset formula of the fault determining time t are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnFor the length of each direct current outlet of bus rod, the v be the backward-travelling wave in the line
Spread speed, the Δ t be abundant value of preset time；
Further, the backward-travelling wave of described route protectionAnd the reversed row of the multiple back side route protection
WaveExtremelyIn fault initiating time t0The calculation formula at j moment in fault determining time t are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor
In the line mould current failure component that this route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor in this line
The line mode voltage fault component that road and multiple back side route surveys obtain；
Further, the high frequency transient component E of described route1jAnd the high frequency transient component E of multiple back side routes2j
To EnjIn the calculation formula at j moment are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line；
Further, the corresponding high frequency transient component of backward-travelling wave and described route for calculating multiple back side routes
The corresponding high frequency transient component of backward-travelling wave ratio calculation formula are as follows:
Wherein, F1To Fn-1For the high frequency transient component E of the multiple back side route2jTo EnjWith the high frequency of described route
Transient state component E1jRatio；
Further, the fault direction for judging this route according to the calculated result of the ratio includes:
If multiple ratios are all larger than 1, judge the fault direction for positive direction；
Otherwise, judge the fault direction for opposite direction.
A kind of multiterminal element electric network fault walking direction system based on traveling wave transient, the system comprises:
Time setting unit, the time setting unit are used to that fault determining time t to be arranged according to preset rules；
Backward-travelling wave computing unit, the backward-travelling wave computing unit are used in fault initiating time t0When to breakdown judge
Between the backward-travelling wave of this route protection and multiple back side route protections is calculated in t；
High frequency transient component calculation unit, the high frequency transient component calculation unit are used to be utilized according to preset rules discrete
Wavelet transformation extracts high frequency transient component of the preset one layer of wavelet coefficient in each backward-travelling wave as corresponding backward-travelling wave；
Fault direction judging unit, the fault direction judging unit are used to calculate the backward-travelling wave pair of multiple back side routes
The ratio of the high frequency transient component answered high frequency transient component corresponding with the backward-travelling wave of described route；And according to ratio result
Judge the fault direction of this route；
Further, the time setting unit is used to calculate the formula of fault determining time are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnFor the length of each direct current outlet of bus rod, the v be the backward-travelling wave in the line
Spread speed, the Δ t be abundant value of preset time；
Further, the backward-travelling wave computing unit is for calculating in fault initiating time t0To fault determining time
The backward-travelling wave of the described route protection at j moment in tAnd the backward-travelling wave of the multiple back side route protection
ExtremelyFormula are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor
In the line mould current failure component that this route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor in this line
The line mode voltage fault component that road and multiple back side route surveys obtain；
Further, the high frequency transient component calculation unit is used to calculate the high frequency transient of this route described in the j moment
Component E1jAnd the high frequency transient component E of multiple back side routes2jTo EnjFormula are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line；
Further, the fault direction judging unit obtains whether multiple ratios are all larger than 1 for judging to calculate, if
Greater than 1, then the judging result for exporting the fault direction is positive direction；Otherwise, then the judging result of the fault direction is exported
For opposite direction.
The invention has the benefit that technical solution of the present invention, it is straight to give a kind of multiterminal based on traveling wave transient
Galvanic electricity net fault direction judgment method and system, the method and system pass through according to each direct current outlet backward-travelling wave of bus rod
And corresponding high frequency transient component, the ratio criterion of multiple back side routes high frequency transient component corresponding with this route is obtained, into
And judge fault direction；The method and system will not be by the shadows of converter station without relying on the additional conditions such as boundary element
It rings, so that its application range is more extensive；And compared to traditional judgement based on current change quantity or current changing rate, have
Higher reliability and sensitivity.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is a kind of multiterminal element electric network fault walking direction based on traveling wave transient of the specific embodiment of the invention
The flow chart of method；
Fig. 2 is a kind of multiterminal element electric network fault walking direction based on traveling wave transient of the specific embodiment of the invention
The structure chart of system.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is a kind of multiterminal element electric network fault walking direction based on traveling wave transient of the specific embodiment of the invention
The flow chart of method；The method obtains direct current by the judgement according to each direct current outlet backward-travelling wave ratio of bus rod
The judging result in electric network fault direction；A kind of multiterminal element electric network fault direction determination process packet based on traveling wave transient
It includes:
Step 110, fault determining time t is set according to preset rules；
Further, the preset formula of the fault determining time t are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnFor the length of each direct current outlet of bus rod, the v be the backward-travelling wave in the line
Spread speed, the Δ t be abundant value of preset time；
In the present embodiment, in each direct current outlet of the bus rod, defining a DC line to be protected is
This route, All other routes are back side route；
The fault determining time t is by the fault initiating time t that receives0, backward-travelling wave flow through each direct current outlet
Shortest time and abundant value of preset time obtain；In the present embodiment, the preset time abundant value takes 0.2ms~0.5ms；
Step 120, it calculates in fault initiating time t0To fault determining time t, this route protection and multiple back sides
The backward-travelling wave of route protection；
In the fault initiating time t0To the period of fault determining time t, to described route and multiple back sides
The line mould current failure component and line mode voltage fault component of route are sampled, and are calculated sampling instant in the present embodiment and are
The backward-travelling wave of j；
The backward-travelling wave of described route protectionAnd the backward-travelling wave of the multiple back side route protectionExtremelyIn fault initiating time t0The calculation formula at j moment in fault determining time t are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor
In the line mould current failure component that this route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor in this line
The line mode voltage fault component that road and multiple back side route surveys obtain；
Step 130, preset one layer of small echo in each backward-travelling wave is extracted using wavelet transform according to preset rules
High frequency transient component of the coefficient as corresponding backward-travelling wave；
Further, the high frequency transient component E of described route1jAnd the high frequency transient component E of multiple back side routes2j
To EnjIn the calculation formula at j moment are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line；
Step 140, the anti-of the corresponding high frequency transient components of backward-travelling wave of multiple back side routes and described route is calculated
To the ratio of the corresponding high frequency transient component of traveling wave；And the fault direction of this route is judged according to the calculated result of the ratio；
Further, the corresponding high frequency transient component of backward-travelling wave and described route for calculating multiple back side routes
The corresponding high frequency transient component of backward-travelling wave ratio calculation formula are as follows:
Wherein, F1To Fn1For the high frequency transient component E of the multiple back side route2jTo EnjWith the high frequency of described route
Transient state component E1jRatio；
Multiple ratios are compared with 1, illustrate that the high frequency transient component of the back side route is greater than if more than 1
The high frequency transient component of this route；Illustrate that the high frequency transient component of the back side route is temporary less than the high frequency of this route if less than 1
State component；
Further, if the criterion includes: that multiple ratios are all larger than 1, judge that the fault direction is positive
Direction；
Otherwise, judge the fault direction for opposite direction.
Fig. 2 is a kind of multiterminal element electric network fault walking direction based on traveling wave transient of the specific embodiment of the invention
The structure chart of system；As shown in Fig. 2, the system comprises:
Time setting unit 210, the time setting unit 210 are used to that fault determining time t to be arranged according to preset rules；
Further, the time setting unit 210 is used to calculate the formula of fault determining time are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnFor the length of each direct current outlet of bus rod, the v be the backward-travelling wave in the line
Spread speed, the Δ t be abundant value of preset time；
Backward-travelling wave computing unit 220, the backward-travelling wave computing unit 220 are used in fault initiating time t0To failure
Judge the backward-travelling wave that this route protection and multiple back side route protections are calculated in time t；
Further, the backward-travelling wave computing unit 220 is for calculating in fault initiating time t0To breakdown judge
The backward-travelling wave of the described route protection at j moment in time tAnd the backward-travelling wave of the multiple back side route protectionExtremelyFormula are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor
In the line mould current failure component that this route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor in this line
The line mode voltage fault component that road and multiple back side route surveys obtain；
High frequency transient component calculation unit 230, the high frequency transient component calculation unit 230 are used for according to preset rules benefit
Wavelet transform is used to extract preset one layer of wavelet coefficient in each backward-travelling wave as the high frequency transient of corresponding backward-travelling wave
Component；
Further, high frequency of the high frequency transient component calculation unit 230 for calculating this route described in the j moment is temporary
State component E1jAnd the high frequency transient component E of multiple back side routes2jTo EnjFormula are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line；
Fault direction judging unit 240, the fault direction judging unit 240 is for calculating the reversed of multiple back side routes
The ratio of the corresponding high frequency transient component of traveling wave high frequency transient component corresponding with the backward-travelling wave of described route；And according to than
Value result judges the fault direction of this route；
Further, the fault direction judging unit 240 obtains whether multiple ratios are all larger than 1 for judging to calculate,
If being all larger than 1, the judging result for exporting the fault direction is positive direction；Otherwise, then the judgement of the fault direction is exported
It as a result is opposite direction.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the disclosure
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.The step of being related in this specification, which numbers, is only used for distinguishing each step, and the time being not limited between each step
Or the relationship of logic, restriction unless the context clearly, otherwise the relationship between each step includes the case where various possible.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means to be in the disclosure
Within the scope of and form different embodiments.For example, embodiment claimed in detail in the claims is one of any
Can in any combination mode come using.
The various component embodiments of the disclosure can be implemented in hardware, or to run on one or more processors
Software module realize, or be implemented in a combination thereof.The disclosure is also implemented as executing side as described herein
The some or all equipment or system program (for example, computer program and computer program product) of method.It is such
It realizes that the program of the disclosure can store on a computer-readable medium, or can have the shape of one or more signal
Formula.Such signal can be downloaded from an internet website to obtain, and perhaps be provided on the carrier signal or with any other shape
Formula provides.
The disclosure is limited it should be noted that above-described embodiment illustrates rather than the disclosure, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.Word "comprising" is not arranged
Except there are element or steps not listed in the claims.Word "a" or "an" located in front of the element does not exclude the presence of more
A such element.The disclosure can be by means of including the hardware of several different elements and by means of properly programmed calculating
Machine is realized.If several in these systems can be by same in the unit claim for listing dry systems
Hardware branch embodies.
The above is only the specific embodiment of the disclosure, it is noted that for the ordinary skill people of this field
Member for, do not depart from the disclosure spirit under the premise of, can make several improvements, modify and deform, these improve, modification,
It is regarded as falling within the scope of protection of this application with deformation.
Claims (11)
1. a kind of multiterminal element electric network fault direction determination process based on traveling wave transient, which comprises
According to preset rules, fault determining time t is set；
It calculates in fault initiating time t0To fault determining time t, this route protection and multiple back side route protections it is reversed
Traveling wave；
Preset one layer of wavelet coefficient in each backward-travelling wave is extracted as correspondence using wavelet transform according to preset rules
The high frequency transient component of backward-travelling wave；
The corresponding high frequency transient component of backward-travelling wave for calculating multiple back side routes is corresponding with the backward-travelling wave of described route
The ratio of high frequency transient component；And the fault direction of this route is judged according to the calculated result of the ratio.
2. according to the method described in claim 1, it is characterized by: the preset formula of the fault determining time t are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnFor the length of each direct current outlet of bus rod, the v is the biography of the backward-travelling wave in the line
Speed is broadcast, the Δ t is abundant value of preset time.
3. according to the method described in claim 1, it is characterized by: the backward-travelling wave of described route protectionAnd it is described
The backward-travelling wave of multiple back side route protectionsExtremelyIn fault initiating time t0The j moment in fault determining time t
Calculation formula are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor at this
The line mould current failure component that route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor this route with
And the line mode voltage fault component that multiple back side route surveys obtain.
4. according to the method described in claim 1, it is characterized by: the high frequency transient component E of described route1jAnd multiple back
The high frequency transient component E on side line road2jTo EnjIn the calculation formula at j moment are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line.
5. according to the method described in claim 4, it is characterized by: the backward-travelling wave for calculating multiple back side routes is corresponding
The calculation formula of the ratio of high frequency transient component high frequency transient component corresponding with the backward-travelling wave of described route are as follows:
Wherein, F1To Fn-1For the high frequency transient component E of the multiple back side route2jTo EnjWith the high frequency transient of described route
Component E1jRatio.
6. the method according to claim 1, wherein judging the event of this route according to the calculated result of the ratio
Barrier direction includes:
If multiple ratios are all larger than 1, judge the fault direction for positive direction；
Otherwise, judge the fault direction for opposite direction.
7. a kind of multiterminal element electric network fault walking direction system based on traveling wave transient, the system comprises:
Time setting unit, the time setting unit are used to that fault determining time t to be arranged according to preset rules；
Backward-travelling wave computing unit, the backward-travelling wave computing unit are used in fault initiating time t0To fault determining time t
Calculate the backward-travelling wave of this route protection and multiple back side route protections；
High frequency transient component calculation unit, the high frequency transient component calculation unit are used to utilize discrete wavelet according to preset rules
High frequency transient component of the preset one layer of wavelet coefficient in each backward-travelling wave as corresponding backward-travelling wave is extracted in transformation；
Fault direction judging unit, the backward-travelling wave that the fault direction judging unit is used to calculate multiple back side routes are corresponding
The ratio of high frequency transient component high frequency transient component corresponding with the backward-travelling wave of described route；And judged according to ratio result
The fault direction of this route.
8. system according to claim 7, it is characterised in that: the time setting unit is for calculating fault determining time
Formula are as follows:
T=t0+min(2l1/v,2l2/v…2ln/v)-Δt；
Wherein, l1To lnIt is the biography of the backward-travelling wave in the line for the length of each direct current outlet of bus rod, the v
Broadcast speed, the Δ t is abundant value of preset time.
9. system according to claim 7, it is characterised in that: the backward-travelling wave computing unit is for calculating in failure
Start time t0The backward-travelling wave of the described route protection at j moment in fault determining time tAnd the multiple back
The backward-travelling wave of side route protectionExtremelyFormula are as follows:
Wherein, Zc1、Zc2To ZcnFor the line mould wave impedance of this route and multiple back side routes；ΔI1、ΔI2To Δ InFor at this
The line mould current failure component that route and multiple back side route surveys obtain；The Δ U1、ΔU2To Δ UnFor this route with
And the line mode voltage fault component that multiple back side route surveys obtain.
10. system according to claim 7, it is characterised in that: the high frequency transient component calculation unit is for calculating in j
The high frequency transient component E of this route described in the moment1jAnd the high frequency transient component E of multiple back side routes2jTo EnjFormula are as follows:
Wherein, dj(k) one layer of wavelet coefficient that preset rules are chosen is pressed for the backward-travelling wave of corresponding line.
11. system according to claim 7, it is characterised in that: the fault direction judging unit is obtained for judging to calculate
Obtain whether multiple ratios are all larger than 1, if being all larger than 1, the judging result for exporting the fault direction is positive direction；Otherwise, then
The judging result for exporting the fault direction is opposite direction.
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| CN114285007A (en) * | 2021-11-11 | 2022-04-05 | 国电南瑞科技股份有限公司 | Pilot protection method, pilot protection system, storage medium and computing equipment |
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