CN102854438B - Method and device for identifying second travelling wave in travelling wave distance protection - Google Patents
Method and device for identifying second travelling wave in travelling wave distance protection Download PDFInfo
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- CN102854438B CN102854438B CN201210364577.1A CN201210364577A CN102854438B CN 102854438 B CN102854438 B CN 102854438B CN 201210364577 A CN201210364577 A CN 201210364577A CN 102854438 B CN102854438 B CN 102854438B
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Abstract
The invention discloses a method and a device for identifying a second travelling wave in travelling wave distance protection. The method comprises the following steps: firstly, performing phase-mode transformation on fault voltage component and fault current component; extracting 0 mode polarities and three 1 mode polarities by taking A, B and C phase as references of an initial travelling wave and the second travelling wave from components of mode domains obtained by the transformation; and finally comparing polarity relationships between the 0 mode polarity and three 1 mode polarities of the initial traveling wave with polarity relationships between the 0 mode polarity and three 1 mode polarities of the second travelling wave correspondingly, and judging the second traveling wave to be a reflected wave of a fault point if at least two relationships in the three comparison relationships are same, and otherwise, judging the second traveling wave to be a reflected wave of a busbar at the opposite end. The method and device disclosed by the embodiment of the invention can effectively identify the second traveling wave in the traveling wave distance protection, thereby judging the correct reflected wave of the fault point, and ensuring the accuracy of a ranging result of the fault point.
Description
Technical field
The present invention relates to field of power, in particular, relate to identify in the distance protection of a kind of row ripple method and the device of second row ripple.
Background technology
The distance protection of row ripple refers to that the fault signature of the row ripple that utilizes transmission line of electricity short circuit generation forms the protection of criterion.Its principle is to utilize initial row ripple and trouble spot reflection wave to arrive the mistiming of measurement point, determines fault distance, forms distance protection.
But, when circuit on power system generation earth fault, and when trouble spot is distant apart from measurement point, initial row ripple comes from trouble spot to measurement point transmitting, receive first row ripple that arrives measurement point at measurement point and be initial row ripple, receiving after initial row ripple, opposite end bus reflection wave can and first arrive measurement point in trouble spot reflection wave front neck in trouble spot refraction.Staff probably will think opposite end bus reflection wave by mistake it is fault point reflection ripple like this, or receiving after second row ripple and the 3rd row ripple, cannot distinguish opposite end bus reflection wave and trouble spot reflection wave, thereby affect the accuracy of trouble spot range finding result.In prior art, there is no the suitable method that can comprehensively differentiate second row wave property.
Summary of the invention
In view of this, the invention provides method and the device of in the distance protection of a kind of row ripple, identifying second row wave property, to solve in the distance protection of row ripple due to the low problem of trouble spot range finding result accuracy that exists opposite end bus reflection wave to cause.
For achieving the above object, the invention provides following technical scheme:
A method of identifying second row ripple in the distance protection of row ripple, comprising:
Calculate respectively three-phase voltage fault component and the three-phase current fault component of faulty line;
Respectively described three-phase voltage fault component and three-phase current fault component are carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark;
Calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components simultaneously according to three 1 mode voltage components and three 1 mould current components;
From the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components, extract respectively 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple;
The 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared, and judge in three groups of comparisons whether at least exist two groups of comparisons identical;
If so, determine that described second row ripple is trouble spot reflection wave; If not, determine that described second row ripple is opposite end bus reflection wave.
Optionally, three groups of polar relationships of described relatively initial row ripple and second row ripple, and judge in three groups of comparisons whether at least exist two groups of comparisons identical, to comprise:
Definition X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0;
Respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c;
Definition discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
Optionally, described three-phase voltage fault component and the three-phase current fault component that calculates respectively faulty line, comprising:
Obtain three-phase fault voltage and the three-phase fault electric current of faulty line;
Adopt superposition principle, calculate three-phase voltage fault component and three-phase current fault component.
Optionally, described described three-phase voltage fault component and described three-phase current fault component are carried out to phase-model transformation, comprising:
Adopt respectively phase mode voltage change of variable formula and phase mould magnitude of current transformation for mula to calculate three-phase voltage fault component and three-phase current fault component.
Optionally, described calculating 0 mould backward-travelling wave and three 1 mould backward-travelling waves, comprising:
Adopt backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
Optionally, 0 mould polarity of described extraction initial row ripple and second row ripple and three 1 mould polarity, comprising:
Adopt wavelet analysis method or method of derivation to extract 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple.
A device of identifying second row ripple in the distance protection of row ripple, comprising:
Fault component computing module, for calculating respectively three-phase voltage fault component and the three-phase current fault component of faulty line;
Modular field component computing module, for respectively described three-phase voltage fault component and three-phase current fault component being carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark;
Backward-travelling wave acquisition module, for calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components according to described three 1 mode voltage components and described three 1 mould current components simultaneously;
Polarity extraction module, for extracting respectively 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components;
Polar relationship calculates judge module, for the 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared, and judge in three groups of comparisons whether at least exist two groups of comparisons identical;
Second row wave property determination module, for calculating judge module judged result at described polar relationship when being, determines that described second row ripple is trouble spot reflection wave; When to calculate judge module judged result be no, determine that described second row ripple is opposite end bus reflection wave at described polar relationship.
Optionally, described polar relationship calculates judge module and comprises:
Polar relationship definition module, for defining X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0;
Polarity with or module, for respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c;
Discriminant value definition judge module, for defining discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
Optionally, described fault component computing module comprises:
Fault parameter acquisition module, for obtaining three-phase fault voltage and the three-phase fault electric current of faulty line;
Component computing module, for adopting superposition principle, calculates three-phase voltage fault component and three-phase current fault component.
Optionally, described backward-travelling wave acquisition module comprises:
Backward-travelling wave computing module, for adopting backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
Known via above-mentioned technical scheme, compared with prior art, the embodiment of the invention discloses method and the device of in the distance protection of a kind of row ripple, identifying second row ripple, first described method is changed false voltage and current component through phase mould, from the component of the modular field that is converted to, extract again 0 mould polarity of initial row ripple and second row ripple and three respectively with A phase, 1 mould polarity of B phase and C phase reference, finally by the polar relationship comparison of 0 mould polarity and three 1 mould polarity corresponding polar relationship of 0 mould polarity of initial row ripple and three 1 mould polarity and second row ripple, if have at least two groups of relations identical in three groups of comparisons, second row ripple is trouble spot reflection wave, otherwise be opposite end bus reflection wave.Embodiment of the present invention the methods and apparatus disclosed, can effectively identify second row ripple in the distance protection of row ripple, thereby judge correct trouble spot reflection wave, ensure the accuracy of trouble spot range finding result.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the method flow diagram of identifying second row ripple in the distance protection of the disclosed row ripple of the embodiment of the present invention;
Fig. 2 is the disclosed calculating voltage of the embodiment of the present invention and current failure component process flow diagram;
Fig. 3 is the process flow diagram of the embodiment of the present invention disclosed judgement initial row ripple and second polarity of traveling wave comparison;
Fig. 4 is the apparatus structure schematic diagram of identifying second row ripple in the distance protection of the disclosed row ripple of the embodiment of the present invention;
Fig. 5 is the disclosed fault component computing module of embodiment of the present invention structural representation;
Fig. 6 is that the disclosed polar relationship of the embodiment of the present invention calculates judge module structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
Fig. 1 is the method flow diagram of identifying second row ripple in the distance protection of the disclosed row ripple of the embodiment of the present invention, and shown in Figure 1, described method can comprise:
Step 101: the three-phase voltage fault component and the three-phase current fault component that calculate respectively faulty line.
In a schematic example, calculating the three-phase voltage fault component of faulty line and the idiographic flow of three-phase current fault component can be referring to Fig. 2, Fig. 2 is the disclosed calculating voltage of the embodiment of the present invention and current failure component process flow diagram, as shown in Figure 2, can comprise:
Step 201: the three-phase fault voltage and the three-phase fault electric current that obtain faulty line.
Step 201 is voltage and the magnitude of current of sampling faulty line, comprising voltage and the magnitude of current of A phase, B phase and C phase.
Step 202: adopt superposition principle, calculate three-phase voltage fault component and three-phase current fault component.
For the ease of understanding the contact between result and each step of each step in the present embodiment, three-phase voltage fault component is made as to u
a, u
b, u
c, three-phase current fault component is made as to i
a, i
b, i
c.
Step 102: respectively described three-phase voltage fault component and three-phase current fault component are carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark.
In the present embodiment, utilize three-phase voltage and the current failure component that Clarke transfer pair step 101 calculates to carry out decoupling zero, calculate three-phase voltage 0 mode voltage component and carry out respectively 1 mode voltage component of phase-model transformation with A phase, B phase and C phase reference, phase mode voltage change of variable formula is:
Step 103: calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components simultaneously according to three 1 mode voltage components and three 1 mould current components.
By 0 mode voltage and the current component of decoupling zero, and 1 mode voltage and current component, the backward-travelling wave of calculating 0 mode voltage component and three 1 mode voltage components; In the present embodiment, adopt backward-travelling wave solution formula u
f0=u
0-z
c0i
0calculate the backward-travelling wave of 0 mode voltage component; Wherein, Zc0 is 0 mould wave impedance, ideally thinks constant; The formula of the solution formula of the backward-travelling wave of 1 mode voltage component and calculating 0 mode voltage component backward-travelling wave is similar.
Step 104: 0 mould polarity and three the 1 mould polarity of extracting respectively initial row ripple and second row ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components.
In the present embodiment, adopt wavelet analysis method or method of derivation to extract 0 mould polarity and three 1 mould polarity, totally eight polarity of initial row ripple and second row ripple.Comprise that 0 mould polarity of initial row ripple and three are respectively with 1 mold component polarity of A phase, B phase and C phase reference; Also comprise that 0 mould polarity of second row ripple and three are respectively with 1 mold component polarity of A phase, B phase and C phase reference.Polarity comprises two kinds, anodal and negative pole.
Step 105: the 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared.
In step 105, obtain altogether six groups of polar relationships, comprising three group of 0 mould polarity of initial row ripple respectively with the polar relationship of its three 1 mould polarity, the three group of 0 mould polarity that also comprises second row ripple respectively with the polar relationship of its three 1 mould polarity.In the present embodiment, be designated as 1 by identical polar relationship, polar relationship difference is designated as 0; For example, 0 mould polarity of initial row ripple is being for just, and initial row ripple taking A mutually as 1 mould polarity of benchmark is as negative, 0 mould polarity of initial row ripple is designated amount of logic 0 with the polar relationship of A phase 1 mould polarity; For another example 0 mould polarity of initial row ripple is for negative, initial row ripple taking B mutually as 1 mould polarity of benchmark is similarly negative, 0 mould polarity of initial row ripple is expressed as amount of logic 1 with the polar relationship of B phase 1 mould polarity.
If 0 mould polarity of initial row ripple is 1 with the polar relationship of A phase 1 mould polarity, 0 mould polarity of second row ripple is also 1 with the polar relationship of A phase 1 mould polarity, so just thinks that 0 mould polarity of initial row ripple and second row ripple is identical with the polarity comparison of A phase 1 mould polarity; If the former is 0, the latter is 1, thinks different, similar with the determination methods of the polarity comparison of B phase 1 mould polarity and 0 mould polarity and C phase 1 mould polarity for 0 mould polarity of initial row ripple and second row ripple.
Step 106: judge in three groups of comparisons whether at least exist two groups of comparisons identical, if so, enter step 107; If not, enter step 108.
In a schematic example, relatively three groups of polar relationships of initial row ripple and second row ripple, and judge in three groups of comparisons, whether at least to exist two groups of identical flow processs of comparison can be referring to Fig. 3, Fig. 3 is the process flow diagram of the embodiment of the present invention disclosed judgement initial row ripple and second polarity of traveling wave comparison, shown in Figure 3, can comprise:
Step 301: definition X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0.
Step 302: respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c.
In step 302, L
a=X
a⊕ Y
a; L
b=X
b⊕ Y
b; L
c=X
c⊕ Y
c.
Step 303: definition discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
Wherein, being in phase-model transformation with A phase, B phase and C phase reference respectively, if have at least 0 mould polarity of two groups of initial row ripples and the polar relationship of 1 mould polarity identical with the polar relationship of 1 mould polarity with 0 mould polarity of second row ripple, the value of L is more than or equal to 1; In the time having two groups of polarity comparisons identical, the value of L is 1, and in the time that three groups of polarity comparisons are all identical, the value of L is 3; If only have at the most one group of polarity comparison identical in three groups of polarity comparisons, the value of L is 0 so.
Step 107: determine that described second row ripple is trouble spot reflection wave.
Step 108: determine that described second row ripple is opposite end bus reflection wave.
It should be noted that, in actual electric system, power circuit can be subject to the impact of power frequency, and therefore error all can appear in general parameter measurement and result of calculation, affects the accuracy of calculating parameter.And the method for second row ripple of the disclosed identification of the embodiment of the present invention, result is not subject to the frequency influence of power circuit, because its recognition result is to come according to the polar relationship judgement in the modular field of initial row ripple and second row ripple.
The present invention is that inventor is while considering feeder line fault, initial row ripple, trouble spot reflection wave and 0 mold component of opposite end bus reflection wave from respectively taking A phase, B phase and C mutually as the polar relationship of 1 mold component of benchmark is different, be not subject to differentiation trouble spot reflection wave that bus structure affects and the method for opposite end bus reflection wave by initial row ripple and the each modulus polar relationship of trouble spot reflection wave and initial row ripple and the each modulus polar relationship of opposite end bus being compared to work out a kind of.
In the present embodiment; in the distance protection of described row ripple, identify the method for second row ripple by the comparison of the each modulus polar relationship to initial row ripple and second row ripple; can effectively identify second row ripple is trouble spot reflection wave or opposite end bus reflection wave, has improved the accurate of trouble spot range finding in the distance protection of row ripple and has determined.
In the disclosed embodiment of the invention described above, describe method in detail, can adopt the device of various ways to realize for method of the present invention, therefore the invention also discloses a kind of device, provide specific embodiment below and be elaborated.
Embodiment bis-
Fig. 4 is the apparatus structure schematic diagram of identifying second row ripple in the distance protection of the disclosed row ripple of the embodiment of the present invention, and shown in Figure 4, the device 40 of identifying second row ripple in the distance protection of described row ripple can comprise:
Fault component computing module 401, for calculating respectively three-phase voltage fault component and the three-phase current fault component of faulty line.
In a schematic example, the concrete structure of described fault component computing module 401 can be referring to Fig. 5, and Fig. 5 is the disclosed fault component computing module of embodiment of the present invention structural representation, and as shown in Figure 5, described fault component computing module 401 can comprise:
Fault parameter acquisition module 501, for obtaining three-phase fault voltage and the three-phase fault electric current of faulty line;
Component computing module 502, for adopting superposition principle, calculates three-phase voltage fault component and three-phase current fault component.
Modular field component computing module 402, for respectively described three-phase voltage fault component and three-phase current fault component being carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark.
Backward-travelling wave acquisition module 403, for calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components according to described three 1 mode voltage components and described three 1 mould current components simultaneously.
Described backward-travelling wave acquisition module 403 can comprise backward-travelling wave computing module, and described backward-travelling wave computing module is used for adopting backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
Polarity extraction module 404, for extracting respectively 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components.
Polar relationship calculates judge module 405, for the 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared, and judge in three groups of comparisons whether at least exist two groups of comparisons identical.
Wherein, in a schematic example, the concrete structure of described polar relationship calculating judge module 405 can be referring to Fig. 6, and Fig. 6 is that the disclosed polar relationship of the embodiment of the present invention calculates judge module structural representation, shown in Figure 6, can comprise:
Polar relationship definition module 601, for defining X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0;
Polarity with or module 602, for respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c;
Discriminant value definition judge module 603, for defining discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
Second row wave property determination module 406, for calculating judge module judged result at described polar relationship when being, determines that described second row ripple is trouble spot reflection wave; When to calculate judge module judged result be no, determine that described second row ripple is opposite end bus reflection wave at described polar relationship.
In the present embodiment; in the distance protection of described row ripple, identify the device of second row ripple by the comparison of the each modulus polar relationship to initial row ripple and second row ripple; can effectively identify second row ripple is trouble spot reflection wave or opposite end bus reflection wave, has improved the accurate of trouble spot range finding in the distance protection of row ripple and has determined.
Disclosed device in this instructions, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
Also it should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a method of identifying second row ripple in the distance protection of row ripple, is characterized in that, comprising:
Calculate respectively three-phase voltage fault component and the three-phase current fault component of faulty line;
Respectively described three-phase voltage fault component and three-phase current fault component are carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark;
Calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components simultaneously according to three 1 mode voltage components and three 1 mould current components;
From the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components, extract respectively 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple;
The 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared, and judge in three groups of comparisons whether at least exist two groups of comparisons identical;
If so, determine that described second row ripple is trouble spot reflection wave; If not, determine that described second row ripple is opposite end bus reflection wave.
2. method according to claim 1, is characterized in that, three groups of polar relationships of described relatively initial row ripple and second row ripple, and judge in three groups of comparisons whether at least exist two groups of comparisons identical, to comprise:
Definition X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0;
Respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c;
Definition discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
3. method according to claim 1, is characterized in that, described three-phase voltage fault component and the three-phase current fault component that calculates respectively faulty line, comprising:
Obtain three-phase fault voltage and the three-phase fault electric current of faulty line;
Adopt superposition principle, calculate three-phase voltage fault component and three-phase current fault component.
4. method according to claim 1, is characterized in that, described described three-phase voltage fault component and described three-phase current fault component is carried out to phase-model transformation, comprising:
Adopt respectively phase mode voltage change of variable formula and phase mould magnitude of current transformation for mula to calculate three-phase voltage fault component and three-phase current fault component.
5. method according to claim 1, is characterized in that, described calculating 0 mould backward-travelling wave and three 1 mould backward-travelling waves, comprising:
Adopt backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
6. method according to claim 1, is characterized in that, 0 mould polarity of described extraction initial row ripple and second row ripple and three 1 mould polarity, comprising:
Adopt wavelet analysis method or method of derivation to extract 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple.
7. a device of identifying second row ripple in the distance protection of row ripple, is characterized in that, comprising:
Fault component computing module, for calculating respectively three-phase voltage fault component and the three-phase current fault component of faulty line;
Modular field component computing module, for respectively described three-phase voltage fault component and three-phase current fault component being carried out to phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively taking A phase, B phase and C mutually as 1 mode voltage component and the 1 mould current component of benchmark;
Backward-travelling wave acquisition module, for calculate 0 mould backward-travelling wave of 0 mode voltage component according to described 0 mode voltage component and described 0 mould current component, calculate 1 mould backward-travelling wave of three 1 mode voltage components according to described three 1 mode voltage components and described three 1 mould current components simultaneously;
Polarity extraction module, for extracting respectively 0 mould polarity and three 1 mould polarity of initial row ripple and second row ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components;
Polar relationship calculates judge module, for the 0 mould polarity of determining initial row ripple and second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second row ripple, 0 mould polarity and three 1 mould polarity corresponding three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are compared, and judge in three groups of comparisons whether at least exist two groups of comparisons identical;
Second row wave property determination module, for calculating judge module judged result at described polar relationship when being, determines that described second row ripple is trouble spot reflection wave; When to calculate judge module judged result be no, determine that described second row ripple is opposite end bus reflection wave at described polar relationship.
8. device according to claim 7, is characterized in that, described polar relationship calculates judge module and comprises:
Polar relationship definition module, for defining X
a, X
band X
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and define Y
a, Y
band Y
cbe respectively taking A phase, B phase and C during mutually as benchmark, the relation of described second row ripple, 0 mould polarity and 1 mould polarity, polarity is identical is designated as 1, and polarity difference is designated as 0;
Polarity with or module, for respectively by X
awith Y
a, X
bwith Y
band X
cwith Y
ccarry out same exclusive disjunction, obtain respectively taking A phase, B phase and C during mutually as benchmark, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and second row ripple 0 mould polarity and the relation of 1 mould polarity or be related to L
a, L
band L
c;
Discriminant value definition judge module, for defining discriminant value L=L
a* L
b+ L
b* L
c+ L
a* L
c, judge whether described discriminant value is more than or equal to 1.
9. device according to claim 7, is characterized in that, described fault component computing module comprises:
Fault parameter acquisition module, for obtaining three-phase fault voltage and the three-phase fault electric current of faulty line;
Component computing module, for adopting superposition principle, calculates three-phase voltage fault component and three-phase current fault component.
10. device according to claim 7, is characterized in that, described backward-travelling wave acquisition module comprises:
Backward-travelling wave computing module, for adopting backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
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| CN104793102B (en) * | 2015-04-08 | 2017-12-29 | 三峡大学 | A kind of single-ended traveling wave fault location method |
| CN105403813A (en) * | 2015-12-16 | 2016-03-16 | 昆明理工大学 | Aerial line single-end travelling wave distance measuring method based on direction traveling wave decomposition and distance calibration |
| CN106526422B (en) * | 2016-11-11 | 2020-03-27 | 清华大学 | Processing method of fault traveling wave of flexible direct current transmission line |
| CN111965495B (en) * | 2020-10-21 | 2021-02-09 | 华东交通大学 | Single-ended fault traveling wave distance measurement method, device and equipment and storable medium |
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