CN102854438A - 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 PDF

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CN102854438A
CN102854438A CN2012103645771A CN201210364577A CN102854438A CN 102854438 A CN102854438 A CN 102854438A CN 2012103645771 A CN2012103645771 A CN 2012103645771A CN 201210364577 A CN201210364577 A CN 201210364577A CN 102854438 A CN102854438 A CN 102854438A
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mode
polarity
phase
traveling wave
component
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CN102854438B (en
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张雪松
黄晓明
杨涛
王慧芳
吴俊�
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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Abstract

本发明公开了一种行波距离保护中识别第二个行波的方法及装置，所述方法首先将故障电压和电流分量经过相模转换，再从转换得到的模域的分量中提取出初始行波和第二行波的0模极性和三个分别以A相、B相和C相位基准的1模极性，最后将初始行波的0模极性和三个1模极性的极性关系对应的与第二行波的0模极性和三个1模极性的极性关系比较，如果三组比较关系中至少有两组关系相同，则第二行波为故障点反射波，否则为对端母线反射波。本发明实施例公开的方法和装置，能够有效识别行波距离保护中的第二行波，从而判断出正确的故障点反射波，保证故障点测距结果的准确性。

Figure 201210364577

The invention discloses a method and device for identifying the second traveling wave in traveling wave distance protection. The method first converts the fault voltage and current components through phase-mode conversion, and then extracts the initial line from the converted mode domain components. The 0-mode polarity of the wave and the second traveling wave and the three 1-mode polarities based on phase A, B-phase and C-phase respectively, and finally the 0-mode polarity and the three 1-mode polarities of the initial traveling wave Comparing the polarity relationship corresponding to the 0-mode polarity and the three 1-mode polarities of the second traveling wave, if at least two of the three comparison relationships are the same, the second traveling wave is the reflected wave at the fault point , otherwise it is the reflected wave of the bus at the opposite end. The method and device disclosed in the embodiments of the present invention can effectively identify the second traveling wave in the traveling wave distance protection, thereby judging the correct reflected wave at the fault point and ensuring the accuracy of the distance measurement result of the fault point.

Figure 201210364577

Description

The row pitch of waves from the protection in identification second capable ripple method and device
Technical field
The present invention relates to field of power, in particular, relate to a kind of row pitch of waves from the protection in identification second capable ripple method and device.
Background technology
The row pitch of waves refers to utilize the protection of the fault signature formation criterion of the capable ripple that the transmission line of electricity short circuit produces from protection.Its principle is to utilize initial row ripple and trouble spot reflection wave to arrive the mistiming of measurement point, determines fault distance, consists of distance protection.
Yet, when circuit on power system generation earth fault, and when the trouble spot is distant apart from measurement point, the initial row ripple comes from the trouble spot to the measurement point emission, receive first capable ripple that arrives measurement point at measurement point and be the initial row ripple, after receiving the initial row ripple, opposite end bus reflection wave can arrive first measurement point in the trouble spot refraction and in trouble spot reflection wave front neck.The staff probably will think opposite end bus reflection wave by mistake it is fault point reflection ripple like this, or after receiving second capable ripple and the 3rd capable ripple, can't distinguish opposite end bus reflection wave and trouble spot reflection wave, thereby affect trouble spot range finding result's accuracy.There is not the suitable method that can comprehensively differentiate second capable wave property in the prior art.
Summary of the invention
In view of this, the invention provides method and the device of a kind of row pitch of waves second capable wave property of identification in the protection, with solve the capable pitch of waves in the protection owing to the trouble spot that exists opposite end bus reflection wave to cause the as a result low problem of accuracy of finding range.
For achieving the above object, the invention provides following technical scheme:
A kind of row pitch of waves from the protection in identification second capable ripple method, 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 phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively take A mutually, B phase and C be 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 simultaneously 1 mould backward-travelling wave of three 1 mode voltage components 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 capable ripple;
The 0 mould polarity of determining initial row ripple and the second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second capable ripple 0 mould polarity and three 1 mould polarity that three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are corresponding compare, and judge in three groups of comparisons whether exist at least two groups of comparisons identical;
If determine that described the second row ripple is the trouble spot reflection wave; If not, determine that described the second row ripple is opposite end bus reflection wave.
Optionally, three groups of polar relationships of described relatively initial row ripple and the second row ripple, and judge that whether to have at least two groups of comparisons in three groups of comparisons identical, comprising:
Definition X A, X BAnd X CWhen being respectively with A phase, B phase and C phase reference, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and definition Y A, Y BAnd Y CWhen being respectively with A phase, B phase and C phase reference, the relation of described the second row ripple 0 mould polarity and 1 mould polarity, polarity is identical to be designated as 1, and the polarity difference is designated as 0;
Respectively with X AWith Y A, X BWith Y BAnd X CWith Y CCarry out same exclusive disjunction, when obtaining respectively with A phase, B phase and C phase reference, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and the relation of the second row ripple 0 mould polarity and 1 mould polarity or concern L A, L BAnd L C
Definition discriminant value L=L A* L B+ L B* L C+ L A* L C, judge that 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 comprises:
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 phase-model transformation, comprising:
Adopt respectively phase mode voltage change of variable formula to calculate three-phase voltage fault component and three-phase current fault component with mould magnitude of current transformation for mula mutually.
Optionally, described calculating 0 mould backward-travelling wave and three 1 mould backward-travelling waves comprise:
Adopt the 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 capable ripple and three 1 mould polarity comprise:
Adopt wavelet analysis method or method of derivation to extract 0 mould polarity and three 1 mould polarity of initial row ripple and second capable ripple.
A kind of row pitch of waves from the protection in identification second capable ripple device, comprising:
The fault component computing module is for the three-phase voltage fault component and the three-phase current fault component that calculate respectively faulty line;
Modular field component computing module, be used for respectively described three-phase voltage fault component and three-phase current fault component being carried out phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively take A mutually, B phase and C be mutually as 1 mode voltage component and the 1 mould current component of benchmark;
The backward-travelling wave acquisition module, be used for calculating according to described 0 mode voltage component and described 0 mould current component 0 mould backward-travelling wave of 0 mode voltage component, calculate simultaneously 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;
The polarity extraction module is for 0 mould polarity and three 1 mould polarity of extracting respectively initial row ripple and second capable ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components;
Polar relationship calculates judge module, 0 mould polarity that be used for to determine initial row ripple and the second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second capable ripple 0 mould polarity and three 1 mould polarity that three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are corresponding compare, and judge in three groups of comparisons whether exist at least two groups of comparisons identical;
The second row wave property determination module is used for calculating the judge module judged result when being at described polar relationship, determines that described the second row ripple is the trouble spot reflection wave; When described polar relationship calculates judge module the determination result is NO, determine that described the second row ripple is opposite end bus reflection wave.
Optionally, described polar relationship calculates judge module and comprises:
The polar relationship definition module is used for defining X A, X BAnd X CWhen being respectively with A phase, B phase and C phase reference, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and definition Y A, Y BAnd Y CWhen being respectively with A phase, B phase and C phase reference, the relation of described the second row ripple 0 mould polarity and 1 mould polarity, polarity is identical to be designated as 1, and the polarity difference is designated as 0;
Polarity with or module, be used for respectively with X AWith Y A, X BWith Y BAnd X CWith Y CCarry out same exclusive disjunction, when obtaining respectively with A phase, B phase and C phase reference, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and the relation of the second row ripple 0 mould polarity and 1 mould polarity or concern L A, L BAnd L C
Discriminant value definition judge module is used for defining discriminant value L=L A* L B+ L B* L C+ L A* L C, judge that whether described discriminant value is more than or equal to 1.
Optionally, described fault component computing module comprises:
The fault parameter acquisition module is for the three-phase fault voltage and the three-phase fault electric current that obtain faulty line;
The component computing module is used for adopting superposition principle, calculates three-phase voltage fault component and three-phase current fault component.
Optionally, described backward-travelling wave acquisition module comprises:
The backward-travelling wave computing module is used for adopting the backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
Via above-mentioned technical scheme as can be known; compared with prior art; the embodiment of the invention discloses a kind of row pitch of waves from the protection in identification second capable ripple method and device; described method is at first with false voltage and the mutually mould conversion of current component process; the 0 mould polarity that from the component of the modular field that is converted to, extracts again initial row ripple and the second row ripple with three respectively with A mutually; 1 mould polarity of B phase and C phase reference; at last 0 mould polarity of initial row ripple and the corresponding polar relationship with 0 mould polarity the second row ripple and three 1 mould polarity of polar relationship of three 1 mould polarity are compared; if have at least two groups of relations identical in three groups of comparisons; then the second row ripple is the trouble spot reflection wave, otherwise is opposite end bus reflection wave.Embodiment of the invention the methods and apparatus disclosed can effectively be identified the second row ripple of the capable pitch of waves in the protection, thereby judge correct trouble spot reflection wave, guarantee trouble spot range finding result's accuracy.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
The method flow diagram of Fig. 1 second capable ripple of identification that be the disclosed row pitch of waves of the embodiment of the invention in the protection;
Fig. 2 is the disclosed calculating voltage of the embodiment of the invention and current failure component process flow diagram;
Fig. 3 is the process flow diagram of the embodiment of the invention disclosed judgement initial row ripple and the second polarity of traveling wave comparison;
The apparatus structure schematic diagram of Fig. 4 second capable ripple of identification that be the disclosed row pitch of waves of the embodiment of the invention in the protection;
Fig. 5 is the disclosed fault component computing module of embodiment of the invention structural representation;
Fig. 6 is that the disclosed polar relationship of the embodiment of the invention calculates the judge module structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment one
The method flow diagram of Fig. 1 second capable ripple of identification that be the disclosed row pitch of waves of the embodiment of the invention in the protection, referring to 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, the three-phase voltage fault component of calculating 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 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 A phase, B phase and C voltage and the magnitude of current mutually.
Step 202: adopt superposition principle, calculate three-phase voltage fault component and three-phase current fault component.
For the ease of the result of understanding each step in the present embodiment and the contact between each step, the three-phase voltage fault component is made as u A, u B, u C, the three-phase current fault component is made as i A, i B, i C
Step 102: respectively described three-phase voltage fault component and three-phase current fault component are carried out phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively take A mutually, B phase and C be mutually as 1 mode voltage component and the 1 mould current component of benchmark.
The three-phase voltage and the current failure component that utilize Clarke transfer pair step 101 to calculate in the present embodiment carry out decoupling zero, calculate three-phase voltage 0 mode voltage component with respectively with A mutually, B phase and C phase reference carry out 1 mode voltage component of phase-model transformation, phase mode voltage change of variable formula is:
u 0 = u 0 A = u 0 B = u 0 C = 1 3 ( u a + u b + u c ) u 1 A = 1 3 ( 2 u a - u b - u c ) u 1 B = 1 3 ( 2 u b - u c - u a ) u 1 C = 1 3 ( 2 u c - u a - u b ) ; The transformation for mula of the phase mould magnitude of current and transform method homophase mode voltage change of variable formula and transform method are similar, and in this not go into detail.
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 simultaneously 1 mould backward-travelling wave of three 1 mode voltage components 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, calculate the backward-travelling wave of 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 1 mould polarity of from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components, extracting respectively initial row ripple and second capable ripple.
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 capable ripple.The 0 mould polarity that comprises the initial row ripple with three respectively with A mutually, 1 mold component polarity of B phase and C phase reference; The 0 mould polarity that also comprises the second row ripple with three respectively with A mutually, 1 mold component polarity of B phase and C phase reference.Polarity comprises anodal and two kinds at negative pole.
Step 105: the 0 mould polarity of determining initial row ripple and the second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second capable ripple 0 mould polarity and three 1 mould polarity that three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are corresponding compare.
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 the second row ripple respectively with the polar relationship of its three 1 mould polarity.In the present embodiment, be designated as 1 with polar relationship is identical, the polar relationship difference is designated as 0; For example, 0 mould polarity of initial row ripple is being for just, and the initial row ripple take A mutually as 1 mould polarity of benchmark as negative, then 0 mould polarity of initial row ripple is designated amount of logic 0 with the polar relationship of A phase 1 mould polarity; 0 mould polarity of initial row ripple is for negative for another example, the initial row ripple be similarly negative as 1 mould polarity of benchmark mutually take B, then 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 the second row ripple also is 1 with the polar relationship of A phase 1 mould polarity, so just thinks that 0 mould polarity of initial row ripple and the second row ripple is identical with the polarity comparison of A phase 1 mould polarity; If the former is 0, the latter is 1, then thinks different, and the determination methods of the polarity comparison of 1 mould polarity and 0 mould polarity and C phase 1 mould polarity is similar mutually for 0 mould polarity of initial row ripple and the second row ripple and B.
Step 106: judge in three groups of comparisons whether exist at least two groups of comparisons identical, if enter step 107; If not, enter step 108.
In a schematic example, three groups of polar relationships that compare initial row ripple and the second row ripple, and judge whether exist at least two groups of identical flow processs of comparison can be referring to Fig. 3 in three groups of comparisons, Fig. 3 is the process flow diagram of the embodiment of the invention disclosed judgement initial row ripple and the second polarity of traveling wave comparison, referring to shown in Figure 3, can comprise:
Step 301: definition X A, X BAnd X CWhen being respectively with A phase, B phase and C phase reference, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and definition Y A, Y BAnd Y CWhen being respectively with A phase, B phase and C phase reference, the relation of described the second row ripple 0 mould polarity and 1 mould polarity, polarity is identical to be designated as 1, and the polarity difference is designated as 0.
Step 302: respectively with X AWith Y A, X BWith Y BAnd X CWith Y CCarry out same exclusive disjunction, when obtaining respectively with A phase, B phase and C phase reference, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and the relation of the second row ripple 0 mould polarity and 1 mould polarity or concern L A, L BAnd L C
In the 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 that whether described discriminant value is more than or equal to 1.
Wherein, respectively with A phase, B phase and C phase reference be in the phase-model transformation, if the polar relationship of 0 mould polarity of the polar relationship that has 0 mould polarity of two groups of initial row ripples and 1 mould polarity at least and the second row ripple and 1 mould polarity is identical, the value of L is more than or equal to 1; When having two groups of polarity comparisons identical, the value of L is 1, and when three groups of polarity comparisons were all identical, the value of L was 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 the second row ripple is the trouble spot reflection wave.
Step 108: determine that described the second row ripple is opposite end bus reflection wave.
Need to prove, in the electric system of reality, power circuit can be subject to the impact of power frequency, and therefore general parameter measurement and result of calculation all error can occur, affects the accuracy of calculating parameter.And the method for second capable ripple of the disclosed identification of the embodiment of the invention, the result is not subjected to the frequency influence of power circuit, because its recognition result is to judge according to the polar relationship in the modular field of initial row ripple and the second row ripple.
The present invention is that the inventor is when considering feeder line fault, initial row ripple, trouble spot reflection wave and 0 mold component of opposite end bus reflection wave are not subjected to differentiation trouble spot reflection wave that bus structure affects and the method for opposite end bus reflection wave from different as the polar relationship of 1 mold component of benchmark mutually take A phase, B phase and C respectively by initial row ripple and each modulus polar relationship of trouble spot reflection wave and initial row ripple and each modulus polar relationship of opposite end bus being compared work out a kind of.
In the present embodiment; described row pitch of waves method of second capable ripple of identification in the protection is passed through the comparison to each modulus polar relationship of initial row ripple and the second row ripple; can effectively identify the second row ripple is trouble spot reflection wave or opposite end bus reflection wave, has improved capable pitch of waves trouble spot range finding accurately fixed in the protection.
Describe method in detail among the disclosed embodiment of the invention described above, can adopt the device of various ways to realize for method of the present invention, therefore the invention also discloses a kind of device, the below provides specific embodiment and is elaborated.
Embodiment two
The apparatus structure schematic diagram of Fig. 4 second capable ripple of identification that be the disclosed row pitch of waves of the embodiment of the invention in the protection, referring to shown in Figure 4, the device 40 that the described row pitch of waves is identified second capable ripple in the protection can comprise:
Fault component computing module 401 is for the three-phase voltage fault component and the three-phase current fault component that calculate respectively 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 invention structural representation, and as shown in Figure 5, described fault component computing module 401 can comprise:
Fault parameter acquisition module 501 is for the three-phase fault voltage and the three-phase fault electric current that obtain faulty line;
Component computing module 502 is used for adopting superposition principle, calculates three-phase voltage fault component and three-phase current fault component.
Modular field component computing module 402, be used for respectively described three-phase voltage fault component and three-phase current fault component being carried out phase-model transformation, obtain 0 mode voltage component and 0 mould current component and respectively take A mutually, B phase and C be mutually as 1 mode voltage component and the 1 mould current component of benchmark.
Backward-travelling wave acquisition module 403, be used for calculating according to described 0 mode voltage component and described 0 mould current component 0 mould backward-travelling wave of 0 mode voltage component, calculate simultaneously 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.
Described backward-travelling wave acquisition module 403 can comprise the backward-travelling wave computing module, and described backward-travelling wave computing module is used for adopting the backward-travelling wave solution formula to calculate 0 mould backward-travelling wave and three 1 mould backward-travelling waves.
Polarity extraction module 404 is for 0 mould polarity and three 1 mould polarity of extracting respectively initial row ripple and second capable ripple from the backward-travelling wave of described 0 mode voltage component and three 1 mode voltage components.
Polar relationship calculates judge module 405,0 mould polarity that be used for to determine initial row ripple and the second row ripple respectively with the polar relationship of three 1 mould polarity, three groups of polar relationships with second capable ripple 0 mould polarity and three 1 mould polarity that three groups of polar relationships of initial row ripple 0 mould polarity and three 1 mould polarity are corresponding compare, and judge in three groups of comparisons whether exist at least 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 invention calculates the judge module structural representation, referring to shown in Figure 6, can comprise:
Polar relationship definition module 601 is used for defining X A, X BAnd X CWhen being respectively with A phase, B phase and C phase reference, the relation of described initial row ripple 0 mould polarity and 1 mould polarity, and definition Y A, Y BAnd Y CWhen being respectively with A phase, B phase and C phase reference, the relation of described the second row ripple 0 mould polarity and 1 mould polarity, polarity is identical to be designated as 1, and the polarity difference is designated as 0;
Polarity with or module 602, be used for respectively with X AWith Y A, X BWith Y BAnd X CWith Y CCarry out same exclusive disjunction, when obtaining respectively with A phase, B phase and C phase reference, same between the relation of described initial row ripple 0 mould polarity and 1 mould polarity and the relation of the second row ripple 0 mould polarity and 1 mould polarity or concern L A, L BAnd L C
Discriminant value definition judge module 603 is used for defining discriminant value L=L A* L B+ L B* L C+ L A* L C, judge that whether described discriminant value is more than or equal to 1.
The second row wave property determination module 406 is used for calculating the judge module judged result when being at described polar relationship, determines that described the second row ripple is the trouble spot reflection wave; When described polar relationship calculates judge module the determination result is NO, determine that described the second row ripple is opposite end bus reflection wave.
In the present embodiment; described row pitch of waves device of second capable ripple of identification in the protection passes through the comparison to each modulus polar relationship of initial row ripple and the second row ripple; can effectively identify the second row ripple is trouble spot reflection wave or opposite end bus reflection wave, has improved capable pitch of waves trouble spot range finding accurately fixed in the protection.
Disclosed device in this instructions, because it is corresponding with the disclosed method of embodiment, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
Also need to prove, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is 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 method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place 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 the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.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)

1.一种行波距离保护中识别第二个行波的方法，其特征在于，包括：1. A method for identifying a second traveling wave in traveling wave distance protection, characterized in that, comprising: 分别计算故障线路的三相电压故障分量和三相电流故障分量；Calculate the three-phase voltage fault component and the three-phase current fault component of the fault line respectively; 分别将所述三相电压故障分量和三相电流故障分量进行相模变换，得到0模电压分量和0模电流分量以及分别以A相、B相和C相为基准的1模电压分量和1模电流分量；Perform phase-to-mode conversion on the three-phase voltage fault component and the three-phase current fault component respectively to obtain the 0-mode voltage component and 0-mode current component and the 1-mode voltage component and 1-mode voltage component based on phase A, phase B and phase C respectively. current component; 根据所述0模电压分量和所述0模电流分量计算得到0模电压分量的0模反向行波，同时根据三个1模电压分量和三个1模电流分量计算得到三个1模电压分量的1模反向行波；According to the 0-mode voltage component and the 0-mode current component, the 0-mode reverse traveling wave of the 0-mode voltage component is calculated, and at the same time, three 1-mode voltages are calculated according to the three 1-mode voltage components and the three 1-mode current components. 1-mode reverse traveling wave of the component; 从所述0模电压分量和三个1模电压分量的反向行波中分别提取初始行波和第二个行波的0模极性与三个1模极性；Extract the 0-mode polarity and three 1-mode polarities of the initial traveling wave and the second traveling wave from the reverse traveling waves of the 0-mode voltage component and three 1-mode voltage components; 确定初始行波和第二行波的0模极性分别与三个1模极性的极性关系，将初始行波0模极性和三个1模极性的三组极性关系对应的与第二个行波0模极性和三个1模极性的三组极性关系进行比较，并判断三组比较关系中，是否至少存在两组比较关系相同；Determine the polarity relationship between the 0-mode polarity of the initial traveling wave and the second traveling wave and the three 1-mode polarities respectively, and correspond to the three sets of polarity relationships between the initial traveling wave 0-mode polarity and the three 1-mode polarities Compare with the three sets of polarity relations of the second traveling wave 0-mode polarity and the three 1-mode polarities, and judge whether there are at least two sets of comparison relations among the three sets of comparison relations that are the same; 若是，确定所述第二行波为故障点反射波；若否，确定所述第二行波为对端母线反射波。If yes, determine that the second traveling wave is the reflected wave at the fault point; if not, determine that the second traveling wave is the reflected wave at the bus bar at the opposite end. 2.根据权利要求1所述的方法，其特征在于，所述比较初始行波和第二行波的三组极性关系，并判断三组比较关系中是否至少存在两组比较关系相同，包括：2. The method according to claim 1, characterized in that, comparing the three groups of polarity relations between the initial traveling wave and the second traveling wave, and judging whether at least two groups of comparison relations among the three groups of comparison relations are the same, including : 定义XA、XB和XC分别为以A相、B相和C相位基准时，所述初始行波0模极性与1模极性的关系，并定义YA、YB和YC分别为以A相、B相和C相位基准时，所述第二行波0模极性与1模极性的关系，极性相同记为1，极性不同记为0；Define X A , X B and X C as the relationship between the initial traveling wave 0-mode polarity and 1-mode polarity when taking A phase, B phase and C phase as reference, and define Y A , Y B and Y C are the relationship between the 0-mode polarity and the 1-mode polarity of the second traveling wave when the A phase, B phase and C phase are used as references, the same polarity is recorded as 1, and the different polarity is recorded as 0; 分别将XA与YA、XB与YB和XC与YC进行同或运算，得到分别以A相、B相和C相位基准时，所述初始行波0模极性和1模极性的关系与第二行波0模极性和1模极性的关系之间的同或关系LA、LB和LC； XA and YA , XB and YB , and XC and YC are respectively subjected to the same OR operation to obtain the initial traveling wave 0-mode polarity and 1-mode polarity and 1-mode The same-OR relationship LA, L B and L C between the polarity relationship and the second traveling wave 0-mode polarity and 1-mode polarity relationship; 定义判别值L=LA*LB+LB*LC+LA*LC，判断所述判别值是否大于等于1。Define a discriminant value L=L A *L B +L B *L C +L A *L C , and judge whether the discriminant value is greater than or equal to 1. 3.根据权利要求1所述的方法，其特征在于，所述分别计算故障线路的三相电压故障分量和三相电流故障分量，包括：3. method according to claim 1, is characterized in that, the three-phase voltage fault component and the three-phase current fault component of described calculating fault line respectively, comprise: 获取故障线路的三相故障电压和三相故障电流；Obtain the three-phase fault voltage and three-phase fault current of the fault line; 采用叠加原理，计算得到三相电压故障分量和三相电流故障分量。Using the principle of superposition, the three-phase voltage fault component and the three-phase current fault component are calculated. 4.根据权利要求1所述的方法，其特征在于，所述将所述三相电压故障分量和所述三相电流故障分量进行相模变换，包括：4. The method according to claim 1, wherein said carrying out phase-mode conversion of said three-phase voltage fault component and said three-phase current fault component comprises: 分别采用相模电压量变换公式和相模电流量变换公式计算三相电压故障分量和三相电流故障分量。The three-phase voltage fault component and the three-phase current fault component are calculated by using the phase-mode voltage transformation formula and the phase-mode current transformation formula respectively. 5.根据权利要求1所述的方法，其特征在于，所述计算0模反向行波和三个1模反向行波，包括：5. method according to claim 1, is characterized in that, described calculating 0 mode reverse traveling wave and three 1 mode reverse traveling waves, comprising: 采用反向行波求解公式计算得到0模反向行波和三个1模反向行波。The 0-mode reverse traveling wave and three 1-mode reverse traveling waves are calculated by using the reverse traveling wave solution formula. 6.根据权利要求1所述的方法，其特征在于，所述提取初始行波和第二个行波的0模极性与三个1模极性，包括：6. The method according to claim 1, wherein the extraction of the 0-mode polarity and three 1-mode polarities of the initial traveling wave and the second traveling wave comprises: 采用小波分析法或求导法提取初始行波和第二个行波的0模极性和三个1模极性。The 0-mode polarity and three 1-mode polarities of the initial traveling wave and the second traveling wave are extracted by wavelet analysis or derivation method. 7.一种行波距离保护中识别第二个行波的装置，其特征在于，包括：7. A device for identifying a second traveling wave in traveling wave distance protection, characterized in that it comprises: 故障分量计算模块，用于分别计算故障线路的三相电压故障分量和三相电流故障分量；The fault component calculation module is used to separately calculate the three-phase voltage fault component and the three-phase current fault component of the fault line; 模域分量计算模块，用于分别将所述三相电压故障分量和三相电流故障分量进行相模变换，得到0模电压分量和0模电流分量以及分别以A相、B相和C相为基准的1模电压分量和1模电流分量；Modulo domain component calculation module, used to perform phase-to-mode conversion on the three-phase voltage fault component and three-phase current fault component respectively, to obtain 0-mode voltage component and 0-mode current component and take A phase, B phase and C phase as reference respectively 1-mode voltage component and 1-mode current component of ; 反向行波获取模块，用于根据所述0模电压分量和所述0模电流分量计算得到0模电压分量的0模反向行波，同时根据所述三个1模电压分量和所述三个1模电流分量计算得到三个1模电压分量的1模反向行波；The reverse traveling wave acquisition module is used to calculate the 0-mode reverse traveling wave of the 0-mode voltage component according to the 0-mode voltage component and the 0-mode current component, and at the same time according to the three 1-mode voltage components and the Three 1-mode current components are calculated to obtain 1-mode reverse traveling waves of three 1-mode voltage components; 极性提取模块，用于从所述0模电压分量和三个1模电压分量的反向行波中分别提取初始行波和第二个行波的0模极性与三个1模极性；The polarity extraction module is used to extract the 0-mode polarity and three 1-mode polarities of the initial traveling wave and the second traveling wave from the reverse traveling waves of the 0-mode voltage component and the three 1-mode voltage components respectively ; 极性关系计算判断模块，用于确定初始行波和第二行波的0模极性分别与三个1模极性的极性关系，将初始行波0模极性和三个1模极性的三组极性关系对应的与第二个行波0模极性和三个1模极性的三组极性关系进行比较，并判断三组比较关系中，是否至少存在两组比较关系相同；The polarity relationship calculation and judgment module is used to determine the polarity relationship between the 0-mode polarity of the initial traveling wave and the second traveling wave and the three 1-mode polarities respectively, and the initial traveling wave 0-mode polarity and the three 1-mode polarities The three sets of polarity relationships corresponding to the second traveling wave 0-mode polarity and the three 1-mode polarities are compared, and it is judged whether there are at least two sets of comparison relationships among the three sets of comparison relationships same; 第二行波性质确定模块，用于在所述极性关系计算判断模块判断结果为是时，确定所述第二行波为故障点反射波；在所述极性关系计算判断模块判断结果为否时，确定所述第二行波为对端母线反射波。The second traveling wave property determination module is used to determine that the second traveling wave is a fault point reflection wave when the judgment result of the polarity relationship calculation and judgment module is yes; the judgment result of the polarity relationship calculation and judgment module is If not, it is determined that the second traveling wave is a reflected wave of the bus bar at the opposite end. 8.根据权利要求7所述的装置，其特征在于，所述极性关系计算判断模块包括：8. The device according to claim 7, wherein the polarity relationship calculation and judgment module comprises: 极性关系定义模块，用于定义XA、XB和XC分别为以A相、B相和C相位基准时，所述初始行波0模极性与1模极性的关系，并定义YA、YB和YC分别为以A相、B相和C相位基准时，所述第二行波0模极性与1模极性的关系，极性相同记为1，极性不同记为0；Polarity relationship definition module, used to define X A , X B and X C are respectively based on A phase, B phase and C phase reference, the relationship between the polarity of the initial traveling wave 0 mode and the polarity of the 1 mode, and define Y A , Y B and Y C are the relationship between the 0-mode polarity and the 1-mode polarity of the second traveling wave when the A-phase, B-phase and C-phase are used as references, the same polarity is recorded as 1, and the polarity is different record as 0; 极性同或模块，用于分别将XA与YA、XB与YB和XC与YC进行同或运算，得到分别以A相、B相和C相位基准时，所述初始行波0模极性和1模极性的关系与第二行波0模极性和1模极性的关系之间的同或关系LA、LB和LC；The polarity OR module is used to perform the OR operation on X A and Y A , X B and Y B , and X C and Y C respectively to obtain the initial row The same-or relationship L A , L B and L C between the relationship between the polarity of the 0-mode polarity and the 1-mode polarity of the wave and the relationship between the polarity of the 0-mode polarity and the 1-mode polarity of the second traveling wave; 判别值定义判断模块，用于定义判别值L=LA*LB+LB*LC+LA*LC，判断所述判别值是否大于等于1。The judgment value definition judging module is used to define a judgment value L=L A *L B +L B *L C +L A *L C , and judge whether the judgment value is greater than or equal to 1. 9.根据权利要求7所述的装置，其特征在于，所述故障分量计算模块包括：9. The device according to claim 7, wherein the fault component calculation module comprises: 故障参数获取模块，用于获取故障线路的三相故障电压和三相故障电流；The fault parameter acquisition module is used to obtain the three-phase fault voltage and the three-phase fault current of the fault line; 分量计算模块，用于采用叠加原理，计算得到三相电压故障分量和三相电流故障分量。The component calculation module is used to calculate and obtain the three-phase voltage fault component and the three-phase current fault component by adopting the superposition principle. 10.根据权利要求7所述的装置，其特征在于，所述反向行波获取模块包括：10. The device according to claim 7, wherein the reverse traveling wave acquisition module comprises: 反向行波计算模块，用于采用反向行波求解公式计算得到0模反向行波和三个1模反向行波。The reverse traveling wave calculation module is used to calculate the 0-mode reverse traveling wave and three 1-mode reverse traveling waves by using the reverse traveling wave solution formula.
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