CN114047408B - High-precision fault location method for power transmission line and related device - Google Patents
High-precision fault location method for power transmission line and related device Download PDFInfo
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- 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
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The application discloses a high-precision fault location method for a power transmission line and a related device, wherein the method comprises the following steps: establishing a high-precision fault location formula of the power transmission line based on the immune transition resistance; extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line; inputting the positive sequence voltage phasor and the positive sequence current phasor at the beginning and the positive sequence voltage phasor and the positive sequence current phasor at the tail end into a high-precision fault location formula to calculate all roots (including real roots and virtual roots); and judging all the roots through a phase angle judging function of a high-precision fault location formula to obtain a unique real root, and obtaining a fault point according to the real root. The distance measurement method is suitable for all voltage classes, has a synchronous vector measurement unit, and can extract synchronous fundamental wave positive sequence voltage and current phasor at the beginning and the tail end to carry out high-precision fault distance measurement calculation. Therefore, the technical problems of poor precision and low universality in the prior art are solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a high-precision fault location method and a related device for a power transmission line.
Background
The high-precision fault location of the power transmission line has important significance for improving the distance protection performance, quickly locating fault points, lightening the fault line inspection burden, shortening the fault power failure time, improving the power supply reliability and ensuring the safe and stable operation of the system. In recent years, more research results are obtained in the field of fault location of power transmission lines, but the problem of location accuracy is not solved well on the whole, and the problem is still to be further improved.
The existing transmission line fault distance measurement methods can be roughly divided into two categories. The first type is a distance measurement algorithm formed by utilizing the information quantity of voltage and current of a single end of a power transmission line after a fault, and the method is called as a single-end distance measurement method. Because the single-ended distance measurement method only needs to utilize single-side fault information, the variable is few, the algorithm is simple, and a large amount of applications are obtained in the system, but the traditional fault distance measurement method utilizing the single-ended power frequency component hardly meets the high-precision requirement because the measurement result is influenced by the transition resistance, the distribution parameters and the setting parameters, and even an error fault distance measurement result can be obtained; the single-ended fault traveling wave based ranging method can effectively solve the influence of transition resistance and an operation mode on fault ranging, but the problems of ranging errors and ranging dead zones caused by insufficient fault traveling wave capturing precision are the biggest challenges encountered by the single-ended traveling wave based ranging method.
The second type is a fault location algorithm formed by utilizing fault information at two ends of a line, which is called as a double-end location method. In recent years, the double-end distance measurement method is mostly used for constructing a phase-comparison function to realize the purpose of fault location, but the existing phase-comparison function method basically realizes fault point location by a method of segmentation and point-by-point search, the location accuracy of the method is mainly influenced by the setting of search step length, the search step length is set too large, the search frequency is small, the calculated amount is small, and the location accuracy is poor; the fault location precision is improved when the search step length is set to be too small, but the search times and the calculated amount are possibly greatly improved, so that the problem that the location precision and the calculated amount are mutually contradictory cannot be effectively solved by the conventional phase-comparison fault location method, and a certain difference exists between the positioning precision and the calculated amount required by a practical system for quick and accurate location.
Disclosure of Invention
The application provides a high-precision fault location method and a related device for a power transmission line, which are used for solving the technical problems of poor precision and low universality in the prior art.
In view of this, a first aspect of the present application provides a method for high-precision fault location of a power transmission line, where the method includes:
establishing a high-precision fault location formula of the power transmission line based on the immune transition resistance;
extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line;
inputting the positive sequence voltage phasor and the positive sequence current phasor at the beginning and the positive sequence voltage phasor and the positive sequence current phasor at the tail end into the high-precision fault location formula to calculate all roots;
and judging each root through a phase angle judging function of the high-precision fault location formula to obtain a unique real root, and obtaining a fault point according to the real root.
Optionally, the establishing of the high-precision fault location formula of the power transmission line based on the immune transition resistance specifically includes:
determining the starting end and the tail end of a fault line, and acquiring the length of the fault line;
setting a reference point in a fault line, and determining fundamental positive sequence voltage phasor and fundamental positive sequence current phasor of the reference point;
and deducing according to the length of the fault line, the reference point, the fundamental wave positive sequence voltage phasor and the fundamental wave positive sequence current phasor to obtain the high-precision fault location formula.
Optionally, the determining each root by the phase angle determining function of the high-precision fault location formula to obtain a unique real root specifically includes:
and inputting each root into the phase angle discrimination function, and acquiring the root corresponding to the phase angle generation variable feature to obtain a unique real root.
Optionally, the high-precision fault location formula specifically includes:
in the formula (I), the compound is shown in the specification,
is the distance between the points m and f,
as the length of the line, it is,
，
，
，
，Zc1is a fundamental positive sequence characteristic impedance, gamma1Is a constant of the positive sequence propagation of the fundamental wave,
is the positive sequence voltage phasor at the beginning,
is the positive sequence current phasor at the beginning,
the positive sequence voltage phasor for the terminal,
the positive sequence current phasor at the end.
Optionally, the phase angle discriminant function is specifically:
in the formula (I), the compound is shown in the specification,
to the distance of failure, ΔlIs the step size.
This application second aspect provides a transmission line high accuracy fault ranging system, the system includes:
the establishing unit is used for establishing a high-precision fault location formula of the power transmission line based on the immunity transition resistance;
the extraction unit is used for extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line;
a calculation unit, configured to input the positive sequence voltage phasor and the positive sequence current phasor at a beginning and the positive sequence voltage phasor and the positive sequence current phasor at a tail end into the high-precision fault location formula to calculate all roots;
and the analysis unit is used for judging each root through a phase angle judging function of the high-precision fault location formula to obtain a unique real root and obtain a fault point according to the real root.
Optionally, the establishing unit is specifically configured to:
determining the starting end and the tail end of a fault line, and acquiring the length of the fault line;
setting a reference point in a fault line, and determining fundamental positive sequence voltage phasor and fundamental positive sequence current phasor of the reference point;
and deducing according to the length of the fault line, the reference point, the fundamental wave positive sequence voltage phasor and the fundamental wave positive sequence current phasor to obtain the high-precision fault location formula.
Optionally, the analysis unit is specifically configured to:
and inputting each root into the phase angle discrimination function, acquiring a root corresponding to the phase angle changing characteristic, obtaining a unique real root, and obtaining a fault point according to the real root.
A third aspect of the present application provides a high-precision fault location apparatus for a power transmission line, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the power transmission line high-precision fault location method according to the instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium, where the computer-readable storage medium is configured to store a program code, where the program code is configured to execute the method for high-precision fault location of a power transmission line according to the first aspect.
According to the technical scheme, the method has the following advantages:
the application provides a high-precision fault location method for a power transmission line, which comprises the following steps: establishing a high-precision fault location formula of the power transmission line based on the immune transition resistance; extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line; inputting the positive sequence voltage phasor and the positive sequence current phasor at the beginning and the positive sequence voltage phasor and the positive sequence current phasor at the tail end into a high-precision fault location formula to calculate all roots (including real roots and virtual roots); and judging all the roots through a phase angle judging function of a high-precision fault location formula to obtain a unique real root, and obtaining a fault point according to the real root.
The high-precision fault location method for the power transmission line comprises the steps of firstly deriving a high-precision fault location formula based on fault fundamental wave positive sequence phasor, then extracting synchronous fundamental wave positive sequence voltage phasor and current phasor of a fault line, secondly inputting the extracted fundamental wave positive sequence voltage phasor into the derived location formula to calculate all roots, and finally determining the only real root, namely a fault point, by utilizing a phase angle discrimination function of the location formula, so that the purpose of high-precision fault location can be realized, and the method has the following advantages: 1) the influence of transition resistance is avoided; 2) the universality is strong and the precision is high; 3) the algorithm is simple and the calculated amount is small; 4) the practicability is strong. 5) The method is suitable for high-precision fault location calculation of fault lines with all voltage classes, synchronous vector measurement units and synchronous fundamental wave positive sequence voltage and current phasors at the beginning and the tail ends. Therefore, the technical problems of poor precision and low universality in the prior art are solved.
Drawings
Fig. 1 is a schematic flow chart of a high-precision fault location method for a power transmission line provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a power transmission line fault provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a power transmission line fault simulation system provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a fault location result provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a high-precision fault location system for a power transmission line provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a high-precision fault location method for a power transmission line provided in an embodiment of the present application includes:
101, establishing a high-precision fault location formula of the power transmission line based on the immune transition resistance;
it should be noted that, the following is a derivation process of the high-precision fault location formula of the present application:
as shown in fig. 2, fig. 2 shows a positive sequence equivalent network when a short-circuit fault occurs in a transmission line, and the total length of a line mn isLWherein f is a fault point, k is a reference point, and the point k is located on the right side of the point f, so that the fundamental wave positive sequence voltage and current phasor distribution at the point k and the point x from the starting end m can be obtained from fig. 2.
In the formula:
、
fundamental wave positive sequence voltage phasor and current phasor at a fault point f calculated for the electric quantity at the m side;
、
and
、
fundamental wave positive sequence voltage phasor and current phasor at k points calculated by the electrical quantities of the m side and the n side respectively;
is the fundamental positive sequence current phasor injected into a fault point;
、
the fundamental wave positive sequence voltage phasor and current phasor at the m points of the starting end;
is the distance between the points m and f,
is the distance between points f and k; gamma ray1Is the fundamental positive sequence propagation constant; zc1Is the fundamental positive sequence characteristic impedance.
The combination type (1), (2) and (3) can be finished to obtain:
after the united vertical type (1), (2) and (4) are finished, the following can be obtained:
in the formula (I), the compound is shown in the specification,
，
，
，
。
according to the formula (5), whenl mf -l mkWhen the signal is not equal to 0, the signal is transmitted,
i.e. not at the point of failure
All are true; if and only ifl mf -l mkWhen the value is not less than 0, the reaction time is not less than 0,
i.e. only at the point of failure
This is true.
As can be seen from the foregoing, the condition shown in equation (7) is satisfied only when the reference point k and the failure point f completely coincide with each other.
In the formula (7)
As a criterion condition for fault location, the requirement on the synchronism of data sampling at two ends of a power transmission line is very strict, factors of PT phase shift, hardware time delay and sampling frequency difference in a PMU system in actual operation are considered, so that the sampling of phasor measurement units at two ends of the power transmission line is not completely synchronous, some tiny phase angle errors exist, the accurate phase angle condition shown in formula (7) can not be established, further the formula (7) has no real root, and finally fault location failure is caused.
Therefore, the invention provides a novel criterion method, which can realize the purpose of high-precision fault location. After the joint vertical type (5) and (6) are considered and the PMU systems at the two ends of the power transmission line have asynchronous phase angle delta, a function can be constructedf(l mk) As shown in formula (8).
Is provided withl mf -l mk=ΔlIs obtained byl mk=l mf -ΔlThen, the formula (8) can be changed to the formula (9).
In the formula:
、
calculated for the electrical quantity on the m side, the m end isl mf -ΔlProcessing fundamental wave positive sequence voltage and current phasors;
、
the distance calculated for the electric quantity of n side, n end isL-(l mf -Δl) Processing fundamental wave positive sequence voltage and current phasors; δ is the asynchronous phase angle, which can be calculated from equation (10).
In the formula:
fundamental positive sequence voltage phasor at the n end point estimated for the electric quantity on the m side before the fault,
fundamental positive sequence voltage phasor extracted for the electrical quantity at the n-terminal before the fault.
When the value of Δ is shown by the formula (9)l >At 0, arg [ f: (l mf -Δl)] ≈90o；Δl <At 0, arg [ f: (l mf -Δl)] ≈-90o；ΔlWhen =0, arg [ f: (l mf -Δl)]=0oI.e. arg [ f: (a)l mf -Δl)]The more the crossing from the left to the right of the failure point f will occur.
Based on the foregoing analysis, the uniqueness of the voltage magnitude and phase angle characteristics at the fault point f can be described using the mathematical model shown in equation (11).
And then a high-precision fault location formula of double-end synchronous phasor measurement based on a distributed parameter model can be deduced, and the formula is shown as a formula (12).
In the above formula:
、
、
、
，
as the length of the line, it is,
is the distance between points m and f, ΔlIs the step size. The distance between m and f points can be calculated with high precision from equation (11)
And the purpose of high-precision fault location is realized, and meanwhile, the calculation process of the formula (12) is irrelevant to the factor of the transition resistance, so that the fault location can realize immunity to the transition resistance.
102, extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental waves at the beginning and the tail end of a fault line;
it should be noted that, in step 102-103, the present embodiment utilizes the simulink module in Matlab software to establish the voltage level of 500kV and the line lengthLA model of a double-ended simulation system of =500km, whose short-circuit fault occurred on the line mn, is shown in fig. 3.
Wherein the m-side system parameters are as follows:
，Zm1=(0.2534+j2.046)Ω，Zm0=(0.1121+j6.723)Ω。
wherein n-side system parameters:
，Zn1=(2.82+j40.092)Ω，Zn0=(0.224+j12.546)Ω。
line parameters of L1=0.8858mH/km, R1=0.027 Ω/km, C1=0.0127 μ F/km; l0=2.0671mH/km, R0=0.1948 Ω/km, C0=0.009 μ F/km.
Simulating BC interphase short circuit fault of a line, wherein the fault point is 70km away from the m side of the bus, and the transition resistance is Rf=5 Ω, the fault is removed after 68 ms.
A butterworth low-pass filter is arranged in front of the m-terminal voltage and n-terminal voltage and current phasor acquisition units, so that after a short-circuit fault occurs in a line, the synchronous phasor acquisition unit quickly extracts a power frequency positive-sequence voltage phasor and a current phasor substitution formula (12) to calculate a fault distance
The results are shown in FIG. 4.
And 104, judging each root through a phase angle judging function of the high-precision fault location formula to obtain a unique real root, and obtaining a fault point according to the real root.
To improve the accuracy of the fault location, the calculation results shown in fig. 4 are averaged, and the averaged result is used
Checking a phase angle discriminant function in the formula (12), and calculating if the checking step length delta l =0.1kmThe result is shown in the formula (13).
The ultimate failure distance obtained from equation (13)l mf=70.0145km, the relative error of the calculated distance measurement is 0.0207%, and the calculation result shows that the algorithm has high accuracy.
The following is a description of a simulation experiment provided for verifying the accuracy of fault location in the present application:
in order to verify the immunity of the ranging method to the transition resistance and the universality to different fault types, the single-phase fault of the line under different transition resistances and different fault types under the same transition resistance are set for calculation, and the results are respectively shown in tables 1, 2 and 3.
TABLE 1 Fault location calculation and error (A phase grounding)
TABLE 2 Fault location calculation results and errors under different fault types
(transition resistance 5. omega.)
TABLE 3 Fault location calculation results and errors under different fault types
(transition resistance 25. OMEGA.)
As for simulation calculation results, the calculation results of all fault types keep higher accuracy, and the method has good application prospect due to the fact that the calculation method is simple, small in calculation amount and strong in applicability, and is not affected by transition resistance and fault types.
The high-precision fault location method for the power transmission line comprises the steps of firstly deriving a high-precision fault location formula based on fault fundamental wave positive sequence phasor, then extracting synchronous fundamental wave positive sequence voltage phasor and current phasor of a fault line, secondly inputting the extracted fundamental wave positive sequence voltage phasor into the derived location formula to calculate all roots, and finally determining a unique real root, namely a fault point, by utilizing a phase angle discrimination function of the location formula, so that the purpose of high-precision fault location can be realized, wherein the method has the following advantages: 1) the influence of transition resistance is avoided; 2) the universality is strong and the precision is high; 3) the algorithm is simple and the calculated amount is small; 4) the practicability is strong. 5) The method is suitable for high-precision fault location calculation of fault lines with all voltage classes, synchronous vector measurement units and synchronous fundamental wave positive sequence voltage and current phasors at the beginning and the tail ends. Therefore, the technical problems of poor precision and low universality in the prior art are solved.
The above is an embodiment of the method for high-precision fault location of the power transmission line provided in the embodiment of the present application, and the following is an embodiment of the system for high-precision fault location of the power transmission line provided in the embodiment of the present application.
Referring to fig. 5, a high-precision fault location system for a power transmission line provided in an embodiment of the present application includes:
the establishing unit 201 is used for establishing a high-precision fault location formula of the power transmission line based on the immunity transition resistance;
an extracting unit 202, configured to extract positive sequence voltage phasors and positive sequence current phasors of synchronous fundamental waves at the start and the end of a fault line;
the calculating unit 203 is used for inputting the positive sequence voltage phasor and the positive sequence current phasor at the beginning and the positive sequence voltage phasor and the positive sequence current phasor at the tail end into a high-precision fault distance measurement formula to calculate all roots;
and the analysis unit 204 is configured to discriminate each root by using a phase angle discrimination function of the high-precision fault location formula to obtain a unique root, and obtain a fault point according to the root.
The utility model provides a transmission line high accuracy fault location system, at first deduce the high accuracy fault location formula based on trouble fundamental wave positive sequence phasor, then extract synchronous fundamental wave positive sequence voltage phasor and the electric current phasor of trouble circuit, secondly input the range finding formula of deriving with the fundamental wave positive sequence voltage phasor of extracting and calculate all roots, utilize the phase angle discriminant function of range finding formula to confirm only real root is the fault point at last, can realize the purpose of high accuracy fault location, the method has following several points: 1) the influence of transition resistance is avoided; 2) the universality is strong and the precision is high; 3) the algorithm is simple and the calculated amount is small; 4) the practicability is strong. 5) The method is suitable for high-precision fault location calculation of fault lines with all voltage classes, synchronous vector measurement units and synchronous fundamental wave positive sequence voltage and current phasors at the beginning and the tail ends. Therefore, the technical problems of poor precision and low universality in the prior art are solved.
Further, the embodiment of the present application further provides a high-precision fault location device for a power transmission line, where the device includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the power transmission line high-precision fault location method according to the instructions in the program code.
Further, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a program code, and the program code is used to execute the method for high-precision fault location of a power transmission line according to the foregoing method embodiment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A high-precision fault location method for a power transmission line is characterized by comprising the following steps:
establishing a high-precision fault location formula of the power transmission line based on the immune transition resistance;
extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line;
inputting the positive sequence voltage phasor and the positive sequence current phasor at the beginning and the positive sequence voltage phasor and the positive sequence current phasor at the tail end into the high-precision fault location formula to calculate all roots;
judging each root through a phase angle judging function of the high-precision fault location formula to obtain a unique real root, and obtaining a fault point according to the real root;
the high-precision fault location formula specifically includes:
in the formula (I), the compound is shown in the specification,
is the distance between the points m and f,
as the length of the line, it is,
，
，
，
，Zc1is a fundamental positive sequence characteristic impedance, gamma1Is a constant of the positive sequence propagation of the fundamental wave,
is the positive sequence voltage phasor at the beginning,
is the positive sequence current phasor at the beginning,
the positive sequence voltage phasor for the terminal,
the positive sequence current phasor at the terminal;
the phase angle discriminant function is specifically as follows:
in the formula (I), the compound is shown in the specification,
is the distance between points m and f, ΔlIs the step size.
2. The method for high-precision fault location of the power transmission line according to claim 1, wherein the establishing of the high-precision fault location formula of the power transmission line based on the immune transition resistance specifically comprises:
determining the starting end and the tail end of a fault line, and acquiring the length of the fault line;
setting a reference point in a fault line, and determining fundamental positive sequence voltage phasor and fundamental positive sequence current phasor of the reference point;
and deducing according to the length of the fault line, the reference point, the fundamental wave positive sequence voltage phasor and the fundamental wave positive sequence current phasor to obtain the high-precision fault location formula.
3. The method according to claim 1, wherein the distinguishing of each root by the phase angle distinguishing function of the high-precision fault location formula is performed to obtain a unique real root, and specifically comprises:
and inputting each root into the phase angle discrimination function, and acquiring the root corresponding to the phase angle generation variable feature to obtain a unique real root.
4. The utility model provides a transmission line high accuracy fault location system which characterized in that includes:
the establishing unit is used for establishing a high-precision fault location formula of the power transmission line based on the immunity transition resistance;
the extraction unit is used for extracting positive sequence voltage phasor and positive sequence current phasor of synchronous fundamental wave at the beginning and the tail end of the fault line;
a calculation unit, configured to input the positive sequence voltage phasor and the positive sequence current phasor at a beginning and the positive sequence voltage phasor and the positive sequence current phasor at a tail end into the high-precision fault location formula to calculate all roots;
the analysis unit is used for judging each root through a phase angle judging function of the high-precision fault location formula to obtain a unique real root and obtain a fault point according to the real root;
the high-precision fault location formula specifically includes:
in the formula (I), the compound is shown in the specification,
is the distance between the m and f points，
As the length of the line, it is,
，
，
，
，Zc1is a fundamental positive sequence characteristic impedance, gamma1Is a constant of the positive sequence propagation of the fundamental wave,
is the positive sequence voltage phasor at the beginning,
is the positive sequence current phasor at the beginning,
the positive sequence voltage phasor for the terminal,
the positive sequence current phasor at the terminal;
the phase angle discriminant function is specifically as follows:
in the formula (I), the compound is shown in the specification,
is the distance between points m and f, ΔlIs the step size.
5. The system according to claim 4, wherein the establishing unit is specifically configured to:
determining the starting end and the tail end of a fault line, and acquiring the length of the fault line;
setting a reference point in a fault line, and determining fundamental positive sequence voltage phasor and fundamental positive sequence current phasor of the reference point;
and deducing according to the length of the fault line, the reference point, the fundamental wave positive sequence voltage phasor and the fundamental wave positive sequence current phasor to obtain the high-precision fault location formula.
6. The power transmission line high-precision fault location system of claim 4, wherein the analysis unit is specifically configured to:
and inputting each root into the phase angle discrimination function, acquiring a root corresponding to the phase angle changing characteristic, obtaining a unique real root, and obtaining a fault point according to the real root.
7. A high-precision fault location device for a power transmission line, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the power transmission line high-precision fault location method according to any one of claims 1 to 3 according to instructions in the program code.
8. A computer-readable storage medium for storing program code for performing the method of power transmission line high accuracy fault ranging of any one of claims 1-3.
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