CN105974274B - A kind of fault positioning method for transmission line and system - Google Patents
A kind of fault positioning method for transmission line and system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
This application discloses a kind of fault positioning method for transmission line, comprising: carries out initial fault ranging using the first Temporal Data of the positive order parameter of route before failure and route after failure, obtains initial ranging value；The positive order parameter of route using the second Temporal Data of route after initial ranging value and failure, after calculating failure；Using after failure the positive order parameter of route and the first Temporal Data carry out fault localization again, obtain revised fault localization value.The application carries out initial fault ranging first with the first Temporal Data of the positive order parameter of route before failure and route after failure, in order to further enhance fault localization precision, the application calculates the positive order parameter of the route after failure using initial ranging value, then fault localization is carried out again using the positive order parameter of route after above-mentioned failure, this, which is equivalent to, has carried out a correcting process to initial ranging value, to obtain the higher fault localization value of precision.In addition, the application further correspondingly discloses a kind of measuring distance of transmission line fault system.
Description
Technical Field
The invention relates to the technical field of fault location, in particular to a method and a system for location of a fault of a power transmission line.
Background
The fault location of the power transmission line is an important component of relay protection of a power system and is a necessary technical measure for ensuring the safe and stable operation of a power grid. The method can be used for timely and accurately positioning a line fault point, is beneficial to quickly processing faults, reduces economic loss caused by power failure, avoids negative influence on social life caused by power failure, and has great technical, economic and social benefits.
However, the ranging accuracy of the conventional fault ranging method cannot completely meet the requirement of power production, and the ranging accuracy needs to be further improved.
In summary, it can be seen that how to further improve the fault location accuracy is a problem to be solved urgently at present.
Disclosure of Invention
In view of this, the present invention provides a method and a system for measuring a fault in a power transmission line, so as to further improve the precision of measuring the fault. The specific scheme is as follows:
a power transmission line fault distance measurement method comprises the following steps:
performing primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault;
calculating a line positive sequence parameter after the fault by using the initial ranging value and second transient data of the line after the fault; the line positive sequence parameter after the fault comprises a propagation coefficient after the fault and characteristic impedance after the fault;
and carrying out fault location again by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault location value.
Preferably, the process of performing initial fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain the initial location value includes:
solving a preset equation by using the line positive sequence parameter before the fault and the first transient data to obtain the initial ranging value; wherein the preset equation is as follows:
in the formula, gamma0Representing the propagation coefficient before said fault, Z0Representing a characteristic impedance before the fault;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first fault return line, x0And the initial ranging value is represented, ch (×) represents a hyperbolic cosine function, and sh (×) represents a hyperbolic sine function.
Preferably, the calculating of the positive sequence parameter of the line after the fault by using the initial ranging value and the second transient data of the line after the fault includes:
solving a first equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the first set of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of said first faulted return line after a fault,representing a negative sequence current at the delivery end of said first fault return after a fault,representing the negative sequence voltage at the receiving end of the first fault return line after the fault,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
Preferably, the calculating of the positive sequence parameter of the line after the fault by using the initial ranging value and the second transient data of the line after the fault includes:
solving a second equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the positive sequence voltage at the delivery end of the second faulted return line after the fault,representing a positive sequence current at the delivery end of said second fault return after a fault,indicating the positive sequence voltage at the receiving end of said second fault loop after a fault,representing the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
Preferably, the method for measuring the distance of the fault of the power transmission line further includes:
step S41: judging whether the corrected fault distance measurement value meets preset distance measurement accuracy, if so, determining the corrected fault distance measurement value as a final fault distance measurement value, and if not, entering step S42;
step S42: determining the corrected fault distance measurement value as a fault distance measurement value to be corrected again;
step S43: carrying out secondary correction processing on the fault distance measurement value to be corrected again to obtain a current correction value;
step S44: and judging whether the current correction value meets the preset ranging precision, if not, determining the current correction value as the fault ranging value to be corrected again, and re-entering the step S43, if so, determining the current correction value as the final fault ranging value, and finishing the correction processing.
Preferably, the process of performing the re-correction processing on the fault location value to be re-corrected each time includes:
calculating the line positive sequence parameter after the fault again by using the fault distance measurement value to be corrected again and the second transient data to obtain a corrected line positive sequence parameter;
and carrying out fault location again by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
The invention also discloses a power transmission line fault distance measurement system, which comprises:
the primary fault location module is used for carrying out primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault;
the parameter calculation module is used for calculating a line positive sequence parameter after the fault by using the initial ranging value and the second transient data of the line after the fault; the line positive sequence parameter after the fault comprises a propagation coefficient after the fault and characteristic impedance after the fault;
and the secondary fault location module is used for carrying out secondary fault location by using the faulted line positive sequence parameter and the first transient data to obtain a corrected fault location value.
Preferably, the primary fault location module specifically uses the line positive sequence parameter before the fault and the first transient data to solve a preset equation to obtain the initial location value; wherein the preset equation is as follows:
in the formula, gamma0Representing the propagation coefficient before said fault, Z0Representing a characteristic impedance before the fault;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first fault return line, x0And the initial ranging value is represented, ch (×) represents a hyperbolic cosine function, and sh (×) represents a hyperbolic sine function.
Preferably, the parameter calculation module is specifically configured to solve the first equation group by using the initial ranging value and the second transient data, so as to obtain the line positive sequence parameter after the fault;
wherein the first set of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of said first faulted return line after a fault,representing a negative sequence current at the delivery end of said first fault return after a fault,representing the negative sequence voltage at the receiving end of the first fault return line after the fault,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
Preferably, the parameter calculation module is specifically configured to solve a second equation set by using the initial ranging value and the second transient data to obtain the line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,indicating a faultThen the positive sequence current of the receiving end of the first fault loop,representing the positive sequence voltage at the delivery end of the second faulted return line after the fault,representing a positive sequence current at the delivery end of said second fault return after a fault,indicating the positive sequence voltage at the receiving end of said second fault loop after a fault,representing the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
Preferably, the power transmission line fault location system further comprises a first precision judgment module, a correction module and a second precision judgment module: the correction module comprises a determination submodule and a correction submodule; wherein,
the first precision judging module is used for judging whether the corrected fault distance measurement value meets preset distance measurement precision, if so, the corrected fault distance measurement value is determined as a final fault distance measurement value, and if not, the correcting module is triggered to start working;
the determining submodule is used for determining the corrected fault distance measuring value as a fault distance measuring value to be corrected again;
the correction submodule is used for performing secondary correction on the fault distance measurement value to be corrected again to obtain a current correction value;
the second precision judging module is used for judging whether the current correction value obtained by the correcting module meets the preset ranging precision, if not, the current correction value is determined as the fault ranging value to be corrected again, the correcting submodule is triggered to start working again, and if yes, the current correction value is determined as the final fault ranging value.
Preferably, the modification submodule includes:
the parameter correcting unit is used for calculating the line positive sequence parameter after the fault again by using the fault distance measurement value to be corrected again and the second transient data to obtain the corrected line positive sequence parameter;
and the secondary fault location unit is used for carrying out secondary fault location by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
The invention discloses a power transmission line fault distance measuring method, which comprises the following steps: performing primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault; calculating a line positive sequence parameter after the fault by using the initial ranging value and the second transient data of the line after the fault; the line positive sequence parameters after the fault comprise a propagation coefficient after the fault and characteristic impedance after the fault; and carrying out fault location again by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault location value. It can be seen that, in the present invention, first fault location is performed by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value, and in order to further improve the fault location accuracy, the present invention calculates the line positive sequence parameter after the fault by using the initial location value, and then performs fault location again by using the line positive sequence parameter obtained based on the initial location value, which is equivalent to performing a correction process on the initial location value, thereby obtaining a fault location value with higher accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for measuring a distance between faults of a power transmission line according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power transmission line fault location system disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The embodiment of the invention discloses a power transmission line fault distance measurement method, which comprises the following steps of:
step S11: performing primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and a characteristic impedance before the fault.
Namely, the initial fault location is carried out by utilizing the propagation coefficient of the power transmission line before the power transmission line breaks down, the characteristic impedance of the power transmission line and the first transient data after the fault, and an initial location value is obtained. The first transient data is detected after the transmission line is in fault, and the transient data comprises voltage and current data.
In addition, the line positive sequence parameter before the fault can be calculated by using the steady-state data of the line before the fault, and the specific calculation process can refer to the existing related technology and is not described herein again.
It should be noted that the initial ranging value is obtained on the basis of the line positive sequence parameter before the fault and the transient data on the line after the fault, and since the line positive sequence parameter before the fault and the line positive sequence parameter after the fault have a relatively obvious difference, the error of the initial ranging value obtained based on the line positive sequence parameter before the fault and the transient data on the line after the fault is large, and further correction processing is required subsequently.
Step S12: calculating a line positive sequence parameter after the fault by using the initial ranging value and second transient data of the line after the fault; the line positive sequence parameter after the fault comprises a propagation coefficient after the fault and characteristic impedance after the fault.
That is, by using the initial ranging value and the second transient data of the line after the fault, the propagation coefficient and the characteristic impedance of the power transmission line after the fault are calculated, and it can be understood that the second transient data and the first transient data are both transient data detected after the fault on the power transmission line, and both include voltage and current data.
Step S13: and carrying out fault location again by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault location value.
It should be noted that, compared to the line positive sequence parameter before the fault, the line positive sequence parameter after the fault can better conform to the fault condition on the line after the fault occurs, so the fault distance measurement value obtained based on the line positive sequence parameter after the fault and the first transient data has higher accuracy than the initial distance measurement value obtained based on the line positive sequence parameter before the fault and the first transient data, and therefore, the fault distance measurement processing again in step S13 is essentially a primary correction processing performed on the initial distance measurement value, so that a fault distance measurement value with higher accuracy is obtained.
In the embodiment of the invention, the power transmission line fault distance measurement method comprises the following steps: performing primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault; calculating a line positive sequence parameter after the fault by using the initial ranging value and the second transient data of the line after the fault; the line positive sequence parameters after the fault comprise a propagation coefficient after the fault and characteristic impedance after the fault; and carrying out fault location again by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault location value. It can be seen that, in the embodiments of the present invention, first, a line positive sequence parameter before a fault and first transient data of a line after the fault are used to perform a primary fault location to obtain an initial location value, and in order to further improve the fault location accuracy, in the embodiments of the present invention, the line positive sequence parameter after the fault is calculated by using the initial location value, and then, fault location is performed again by using the line positive sequence parameter obtained based on the initial location value, which is equivalent to performing a primary correction process on the initial location value, so as to obtain a fault location value with higher accuracy.
The embodiment of the invention discloses a specific power transmission line fault distance measurement method, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme. Specifically, the method comprises the following steps:
in step S11 of the previous embodiment, the process of performing the primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain the initial location value includes: solving a preset equation by using the line positive sequence parameter and the first transient data before the fault to obtain an initial ranging value; wherein, the preset equation is as follows:
in the formula, gamma0Denotes the propagation coefficient before failure, Z0Representing the characteristic impedance before failure;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first faulty return wire, x0Denotes the initial range value, ch (—) denotes a hyperbolic cosine function, sh: (*) Representing a hyperbolic sine function. It is understood that the line positive sequence parameter before the fault includes gamma0And Z0(ii) a The first transient data comprises And
it is understood that the initial ranging value x can be obtained by simplifying the predetermined equation to obtain a corresponding simplified equation, and then using the simplified equation0. Wherein the simplified equation is:
where th (#) represents a hyperbolic tangent function. By solving the simplified equation, the initial ranging value can be obtained.
In step S12 of the previous embodiment, two different calculation methods may be specifically used to calculate the line positive sequence parameter after the fault according to two different situations on the power transmission line, where the first method is applied to step S12 when the transient data at both ends on the same fault loop after the fault both have positive sequence and negative sequence components with larger amplitudes, and the second method is applied to step S12 when the transient data at both ends on any fault loop both have smaller amplitudes of negative sequence components.
More specifically, the first method specifically includes: solving the first equation group by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the first program group includes:
in the formula, x0Represents an initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of the first faulted return line after the fault,representing the negative sequence current at the delivery end of the first fault return after the fault,indicating the negative sequence voltage at the receiving end of the first fault loop after the fault,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing propagation coefficient after failure, Z1Representing the characteristic impedance after the fault and l representing the total length of the first fault return line. It is understood that, when the first method is applied in step S12, the second transient data specifically includes the first program groupAndin the first method, γ can be obtained by solving the first equation group1And Z1。
Specifically, by solving the first equation group, the following can be obtained:
wherein,
in the above two formulas, gamma is obtained1Based on the following equation one or two, Z can be obtained accordingly1. It should be noted that both the first equation and the second equation are equations derived from the first equation set. Wherein,
the first equation is specifically:
the second equation is specifically:
the second method specifically includes: solving a second equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Represents an initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current at the receiving end of the first fault loop after the fault,representing the positive sequence voltage at the delivery end of the second faulted return line after the fault,representing the positive sequence current at the delivery end of the second fault return after the fault,indicating the positive sequence voltage at the receiving end of the second fault loop after the fault,indicating the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing propagation coefficient after failure, Z1Representing the characteristic impedance after the fault and l representing the total length of the first fault return line. It is to be understood that, when the second method is applied to step S12, the second transient data specifically includes the second equation setAndin the second method, γ can be obtained by solving the second equation system1And Z1。
In particular, by the second set of equations above, in combinationAndthe following formula can be derived:
wherein,
by combining the above two equations with the expansion process of the Meglaolin series, gamma can be obtained1Wherein
wherein,
in the determination of gamma1Based on the following equation III, Z can be obtained accordingly1It should be noted that the third equation is derived from the second equation set. Wherein,
the third equation is as follows:
wherein,
as can be seen from the above, in the case where the positive sequence component and the negative sequence component with larger amplitudes exist in the transient data of both ends on the same fault loop after the fault, the first method is applied in the step S12, and in the case where the negative sequence component in the transient data of both ends on any fault loop is smaller in amplitude, the second method is applied in the step S12.
In addition, in step S13 of the previous embodiment, the process of performing fault distance measurement again by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault distance measurement value may specifically include: and solving the adjusted preset equation by using the line positive sequence parameter after the fault and the first transient data to obtain the corrected fault distance measurement value. Wherein, the adjusted preset equation specifically comprises:
in the formula, gamma1Represents the propagation coefficient after failure, Z, calculated in the above step S121A characteristic impedance after the failure calculated in the step S12;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first faulty return wire, x1And indicating the corrected fault distance measurement value. It is understood that the line positive sequence parameter after the fault includes gamma1And Z1(ii) a The first transient data comprisesAndin this embodiment, the corrected fault location value x may be obtained by solving the adjusted preset equation1。
It should be noted that, as for the solving process of the adjusted preset equation, reference may be made to the solving process of the initial ranging value that has been disclosed previously, and details are not repeated here.
The embodiment of the invention discloses a more specific power transmission line fault location method, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme. Specifically, the method comprises the following steps:
in order to further improve the fault location accuracy, compared with the two embodiments, the power transmission line fault location method in this embodiment may further include the following steps S41 to S44; wherein,
step S41: judging whether the fault distance measurement value corrected in the step S13 of the previous embodiment meets the preset distance measurement accuracy, if yes, determining the corrected fault distance measurement value as the final fault distance measurement value, and if not, entering the step S42;
step S42: determining the corrected fault distance measurement value as a fault distance measurement value to be corrected again;
step S43: carrying out secondary correction processing on the fault distance measurement value to be corrected again to obtain a current correction value;
step S44: and judging whether the current correction value meets the preset ranging precision, if not, determining the current correction value as the fault ranging value to be corrected again, and re-entering the step S43, if so, determining the current correction value as the final fault ranging value, and finishing the correction processing.
In step S43, the process of performing the re-correction process on the fault location value to be re-corrected each time specifically includes: and calculating the line positive sequence parameter after the fault again by using the fault distance measurement value to be corrected again and the second transient data to obtain a corrected line positive sequence parameter, and performing fault distance measurement again by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
It should be noted that the preset distance measurement accuracy may be specifically set by a technician according to an actual distance measurement accuracy requirement, and is not specifically limited herein.
It can be understood that, in the process of calculating the line positive sequence parameter after the fault again by using the fault location value to be corrected again and the second transient data, reference may be made to the first method or the second method already disclosed in the foregoing embodiment, and details are not described here again. Similarly, the above process of performing fault location again by using the corrected line positive sequence parameter and the first transient data may refer to the solution process of the initial ranging value disclosed in the foregoing embodiment, and is not described herein again.
Correspondingly, the embodiment of the invention also discloses a power transmission line fault distance measurement system, which is shown in fig. 2 and comprises:
the primary fault location module 21 is configured to perform primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault, so as to obtain an initial location value; wherein, the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and a characteristic impedance before the fault;
the parameter calculation module 22 is configured to calculate a positive sequence parameter of the line after the fault by using the initial ranging value and the second transient data of the line after the fault; the line positive sequence parameters after the fault comprise a propagation coefficient after the fault and characteristic impedance after the fault;
and a secondary fault location module 23, configured to perform secondary fault location by using the faulty line positive sequence parameter and the first transient data, so as to obtain a corrected fault location value.
It can be seen that, in the embodiments of the present invention, first, a line positive sequence parameter before a fault and first transient data of a line after the fault are used to perform a primary fault location to obtain an initial location value, and in order to further improve the fault location accuracy, in the embodiments of the present invention, the line positive sequence parameter after the fault is calculated by using the initial location value, and then, fault location is performed again by using the line positive sequence parameter obtained based on the initial location value, which is equivalent to performing a primary correction process on the initial location value, so as to obtain a fault location value with higher accuracy.
Specifically, the primary fault location module may solve a preset equation by using a line positive sequence parameter and first transient data before the fault to obtain an initial location value; wherein the preset equation is as follows:
in the formula, gamma0Denotes the propagation coefficient before failure, Z0Representing the characteristic impedance before failure;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first faulty return wire, x0Denotes an initial ranging value, ch (×) denotes a hyperbolic cosine function, and sh (×) denotes a hyperbolic sine function.
In addition, under the condition that the transient data at two ends of the same fault loop line after the fault has the positive sequence component and the negative sequence component with larger amplitude, the parameter calculation module can be specifically used for solving the first equation group by using the initial ranging value and the second transient data to obtain the positive sequence parameter of the line after the fault;
wherein the first program group includes:
in the formula, x0Represents an initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of the first faulted return line after the fault,representing the negative sequence current at the delivery end of the first fault return after the fault,after indicating a faultThe negative sequence voltage at the receiving end of the first fault loop,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing propagation coefficient after failure, Z1Representing the characteristic impedance after the fault and l representing the total length of the first fault return line.
Under the condition that the amplitude of the negative sequence component in the transient data at two ends of any fault loop is smaller, the parameter calculation module can be specifically used for solving a second equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Represents an initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing the positive sequence current at the delivery end of the first fault return after the fault,indicating the positive sequence voltage at the receiving end of the first fault loop after the fault,indicating the positive sequence current at the receiving end of the first fault loop after the fault,positive sequence of delivery side representing second faulty return after faultThe voltage is applied to the surface of the substrate,representing the positive sequence current at the delivery end of the second fault return after the fault,indicating the positive sequence voltage at the receiving end of the second fault loop after the fault,indicating the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing propagation coefficient after failure, Z1Representing the characteristic impedance after the fault and l representing the total length of the first fault return line.
In order to further improve the fault location accuracy, the power transmission line fault location system in this embodiment may further include a first accuracy determining module, a correcting module, and a second accuracy determining module: the correction module comprises a determination submodule and a correction submodule; wherein,
the first precision judging module is used for judging whether the corrected fault distance measurement value meets the preset distance measurement precision, if so, the corrected fault distance measurement value is determined as the final fault distance measurement value, and if not, the correcting module is triggered to start working;
the determining submodule is used for determining the corrected fault distance measuring value as a fault distance measuring value to be corrected again;
the correction submodule is used for carrying out secondary correction on the fault distance measurement value to be corrected again to obtain a current correction value;
and the second precision judgment module is used for judging whether the current correction value obtained by the correction module meets the preset ranging precision, if not, determining the current correction value as the fault ranging value to be corrected again, triggering the correction submodule to start work again, and if so, determining the current correction value as the final fault ranging value.
Specifically, the correction submodule comprises a parameter correction unit and a secondary fault location unit; the parameter correction unit is specifically configured to calculate a line positive sequence parameter after a fault again by using the fault distance value to be corrected again and the second transient data to obtain a corrected line positive sequence parameter, and the secondary fault distance measurement unit is specifically configured to perform secondary fault distance measurement by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method and the system for measuring the distance of the transmission line fault provided by the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. A power transmission line fault distance measurement method is characterized by comprising the following steps:
performing primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault;
calculating a line positive sequence parameter after the fault by using the initial ranging value and second transient data of the line after the fault; the line positive sequence parameter after the fault comprises a propagation coefficient after the fault and characteristic impedance after the fault;
performing fault location again by using the faulted line positive sequence parameter and the first transient data to obtain a corrected fault location value;
the first transient data and the second transient data are transient data detected after a fault on the power transmission line and comprise voltage data and current data.
2. The method according to claim 1, wherein the process of performing the primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain the initial location value comprises:
solving a preset equation by using the line positive sequence parameter before the fault and the first transient data to obtain the initial ranging value; wherein the preset equation is as follows:
in the formula, gamma0Representing the propagation coefficient before said fault, Z0Representing a characteristic impedance before the fault;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,indicate the reason forThe positive sequence current of the receiving end of the first fault loop after the fault occurs; l denotes the total length of the first fault return line, x0And the initial ranging value is represented, ch (×) represents a hyperbolic cosine function, and sh (×) represents a hyperbolic sine function.
3. The method according to claim 2, wherein the step of calculating the positive sequence parameter of the line after the fault by using the initial ranging value and the second transient data of the line after the fault when the positive sequence component and the negative sequence component with larger amplitude exist in the transient data of both ends on the same fault loop after the fault comprises:
solving a first equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the first set of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of said first faulted return line after a fault,representing a negative sequence current at the delivery end of said first fault return after a fault,representing the negative sequence voltage at the receiving end of the first fault return line after the fault,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
4. The method according to claim 2, wherein the step of calculating the positive sequence parameter of the line after the fault by using the initial ranging value and the second transient data of the line after the fault when the amplitude of the negative sequence component in the transient data of both ends on any fault loop is relatively small comprises:
solving a second equation set by using the initial ranging value and the second transient data to obtain a line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Representing the initial ranging value;indicating a faultThe positive sequence voltage of the transmission end of the first fault return line,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the positive sequence voltage at the delivery end of the second faulted return line after the fault,representing a positive sequence current at the delivery end of said second fault return after a fault,indicating the positive sequence voltage at the receiving end of said second fault loop after a fault,representing the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
5. The method for ranging the fault of the power transmission line according to any one of claims 1 to 4, further comprising:
step S41: judging whether the corrected fault distance measurement value meets preset distance measurement accuracy, if so, determining the corrected fault distance measurement value as a final fault distance measurement value, and if not, entering step S42;
step S42: determining the corrected fault distance measurement value as a fault distance measurement value to be corrected again;
step S43: carrying out secondary correction processing on the fault distance measurement value to be corrected again to obtain a current correction value;
step S44: and judging whether the current correction value meets the preset ranging precision, if not, determining the current correction value as the fault ranging value to be corrected again, and re-entering the step S43, if so, determining the current correction value as the final fault ranging value, and finishing the correction processing.
6. The method for ranging the faults of the power transmission line according to claim 5, wherein the process of performing the re-correction processing on the fault ranging value to be re-corrected each time comprises the following steps:
calculating the line positive sequence parameter after the fault again by using the fault distance measurement value to be corrected again and the second transient data to obtain a corrected line positive sequence parameter;
and carrying out fault location again by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
7. A transmission line fault location system, comprising:
the primary fault location module is used for carrying out primary fault location by using the line positive sequence parameter before the fault and the first transient data of the line after the fault to obtain an initial location value; the line positive sequence parameters before the fault comprise a propagation coefficient before the fault and characteristic impedance before the fault;
the parameter calculation module is used for calculating a line positive sequence parameter after the fault by using the initial ranging value and the second transient data of the line after the fault; the line positive sequence parameter after the fault comprises a propagation coefficient after the fault and characteristic impedance after the fault;
the secondary fault location module is used for carrying out secondary fault location by using the line positive sequence parameter after the fault and the first transient data to obtain a corrected fault location value;
the first transient data and the second transient data are transient data detected after a fault on the power transmission line and comprise voltage data and current data.
8. The power transmission line fault location system of claim 7, wherein the primary fault location module solves a preset equation to obtain the initial location value by specifically using the line positive sequence parameter before the fault and the first transient data; wherein the preset equation is as follows:
in the formula, gamma0Representing the propagation coefficient before said fault, Z0Representing a characteristic impedance before the fault;representing the positive sequence voltage at the delivery end of the first fault return after the fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,indicating the positive sequence current of the receiving end of the first fault loop after the fault; l denotes the total length of the first fault return line, x0Expressing the initial distance measurement value, ch (x) expressing hyperbolic cosine function, sh (x) expressing hyperbolic sine functionAnd (4) counting.
9. The power transmission line fault location system of claim 8, wherein, in a case where the transient data at both ends on the same fault loop line after the fault have positive sequence and negative sequence components with larger amplitudes, the parameter calculation module is specifically configured to solve the first equation group by using the initial location value and the second transient data, so as to obtain the line positive sequence parameter after the fault;
wherein the first set of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating the positive sequence voltage at the receiving end of said first fault loop after a fault,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the negative sequence voltage at the delivery end of said first faulted return line after a fault,indicating a faultThen the negative sequence current of the transmission end of the first fault return line,representing the negative sequence voltage at the receiving end of the first fault return line after the fault,representing the negative sequence current of the receiving end of the first fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
10. The power transmission line fault location system of claim 8, wherein, in a case that magnitudes of negative sequence components in transient data at both ends on any fault loop are relatively small, the parameter calculation module is specifically configured to solve a second equation set by using the initial ranging value and the second transient data to obtain the line positive sequence parameter after the fault;
wherein the second system of equations comprises:
in the formula, x0Representing the initial ranging value;representing the positive sequence voltage at the delivery end of the first fault return after a fault,representing a positive sequence current at the delivery end of said first fault return after a fault,indicating said first faulty return after faultThe positive-sequence voltage at the receiving end,represents the positive sequence current at the receiving end of the first fault loop after the fault,representing the positive sequence voltage at the delivery end of the second faulted return line after the fault,representing a positive sequence current at the delivery end of said second fault return after a fault,indicating the positive sequence voltage at the receiving end of said second fault loop after a fault,representing the positive sequence current of the receiving end of the second fault loop after the fault; gamma ray1Representing the propagation coefficient after said fault, Z1Representing the characteristic impedance after the fault, and l representing the total length of the first fault return line.
11. The power transmission line fault location system of any one of claims 7 to 10, further comprising a first precision judgment module, a correction module and a second precision judgment module: the correction module comprises a determination submodule and a correction submodule; wherein,
the first precision judging module is used for judging whether the corrected fault distance measurement value meets preset distance measurement precision, if so, the corrected fault distance measurement value is determined as a final fault distance measurement value, and if not, the correcting module is triggered to start working;
the determining submodule is used for determining the corrected fault distance measuring value as a fault distance measuring value to be corrected again;
the correction submodule is used for performing secondary correction processing on the fault distance measurement value to be corrected again to obtain a current correction value;
the second precision judging module is used for judging whether the current correction value obtained by the correcting module meets the preset ranging precision, if not, the current correction value is determined as the fault ranging value to be corrected again, the correcting submodule is triggered to start working again, and if yes, the current correction value is determined as the final fault ranging value.
12. The electrical transmission line fault ranging system of claim 11, wherein the revision submodule comprises:
the parameter correcting unit is used for calculating the line positive sequence parameter after the fault again by using the fault distance measurement value to be corrected again and the second transient data to obtain the corrected line positive sequence parameter;
and the secondary fault location unit is used for carrying out secondary fault location by using the corrected line positive sequence parameter and the first transient data to obtain a corresponding current correction value.
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