CN106202637B - OPGW system grounding short circuit current analysis method based on extended phase component method - Google Patents
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Abstract
An OPGW system grounding short circuit current analysis method based on an extended phase component method is characterized in that a phase conductor and an OPGW are taken as a whole, interaction between the phase conductor and the OPGW is considered, and the phase conductor and the OPGW are analyzed on an analysis model by adopting a consistent model. The method can accurately obtain the electric quantities distributed along the lines such as the OPGW line, the short-circuit current on the phase line and the like of the power transmission system when the single-phase grounding short circuit occurs. The method is suitable for two different situations of a power transmission system with a single-ended power supply and a power transmission system with a double-ended power supply; the method also comprises a mode that two OPGW lines run simultaneously in the power transmission system; the method also comprises a complex operation mode of whether the two OPGW lines are insulated in a subsection mode and whether the two OPGW lines are grounded on the step-by-step tower; and further comprises a distribution rule of the short-circuit current on the OPGW line calculated by a new algorithm. The application has mature technology and high reliability.
Description
Technical Field
The application belongs to the field of power transmission systems, and particularly relates to a novel method for analyzing grounding short circuit current of an OPGW (optical fiber composite overhead ground wire) system based on an extended phase component method, which is suitable for a complex power transmission system of double OPGW lines of a 110-500 kV double-side power supply or a single-side power supply. The operation mode of the OPGW is closer to the actual operation condition of a modern power transmission system, including whether the OPGW operates in a segmented insulation mode and whether the OPGW operates in a step-by-step tower grounding mode. The method and the device can accurately analyze the distribution states of the short-circuit current value on the phase line and the short-circuit current on the OPGW line when the power transmission line is in the ground short circuit, have good application value, and have great significance for the distribution of the short-circuit current after the power transmission system is in the ground short circuit.
Background
The overhead transmission lines with the voltage class of 110kV and above in China are configured by double OPGW lines, and the current trend is to gradually replace common ground wires by optical fiber composite OPGW lines. Compared with the traditional ground wire, the optical fiber composite OPGW wire has smaller impedance value, and the proportion of short-circuit current shunted by the optical fiber composite OPGW wire is larger during fault. Overhead transmission lines can be broken down into large-scale power networks formed by span units. The formed large-scale power network has many factors to be considered, and from the perspective of phase conductors, the factors comprise transposition information of the overhead power transmission line, parameters of systems on two sides of the line and the like; from the perspective of the OPGW line, the situations include whether the OPGW is grounded to operate tower by tower, whether the OPGW is in a segmented insulation operation, whether the OPGW is grounded via impedance, and other operation modes; from the perspective of the electric power tower, the parameters comprise the stage number of the tower, the model number of the tower, the grounding resistance of the tower and the like; and further comprises mutual inductance influence between the phase line and the OPGW, between the OPGW and the like. These all contribute to some degree of complication of the line operating conditions.
In order to calculate the distribution of the short-circuit current on the OPGW line when single-phase grounding occurs, there are currently three methods: when the simplified calculation method is adopted, the magnetic coupling effect between the phase line and the OPGW line is not considered, the operation mode of the overhead transmission line is not considered, the short-circuit current on the OPGW line is shunted by a certain percentage of the short-circuit current of the line outlet substation bus, and the percentage is based on engineering experience. Although the method is simple, the neglected important factors are too many, so that the calculation result is rough and the reliability is low. Some researchers adopt a sequence component method for calculation, but an important premise of the application of the sequence component method is that three-phase parameters of a system are symmetrical, the actual line running condition is complex, and the symmetrical condition is more difficult to meet, so that the calculation result is conservative. The phase component-based calculation method can fully reflect the complex operation condition of the power transmission line, has no requirement on the symmetry of three-phase system parameters, and can reflect the factors such as mutual inductance between the leads, different operation modes of the overhead ground wire and the like. Therefore, in the face of complex operation modes of lines and overhead ground wires, the phase component method is more and more widely applied to calculating short-circuit current on the overhead ground wires, and the traditional phase component method does not calculate the short-circuit current on a phase line and the short-circuit current on an OPGW (optical fiber composite overhead ground wire) at the same time, so that the calculation process is increased, and a unified calculation system cannot be formed. This application is on the basis of traditional phase component method to improve it, adopt extension phase component method, be about to phase conductor and OPGW line as a whole, consider the interact between the two simultaneously, adopt unanimous model to carry out the analysis with phase conductor and OPGW line on analytical model.
The method for analyzing the grounding short-circuit current of the OPGW system based on the extended phase component method can accurately analyze the distribution states of the short-circuit current value on the phase line and the short-circuit current on the OPGW line when the power transmission line is in grounding short circuit.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provides a new method for analyzing the grounding short circuit current of the OPGW system based on an extended phase component method. The application innovatively provides a new method for processing the distribution of the short-circuit current when the power transmission line is in the ground short-circuit fault. The method is suitable for the complex power transmission system of the double OPGW (optical fiber composite overhead ground wire) of the 110-500 kV double-side power supply or single-side power supply. The operation mode of the OPGW line is closer to the actual operation condition of the modern power transmission system, including whether the OPGW line operates in a segmented insulation mode and whether the overhead ground wire operates in a tower-by-tower grounding mode. The method and the device can accurately analyze the distribution states of the short-circuit current value on the phase line and the short-circuit current on the OPGW line when the power transmission line is in the ground short circuit, have good application value, and have great significance for the distribution of the short-circuit current after the power transmission system is in the ground short circuit.
The technical scheme of the application is as follows:
an OPGW system grounding short circuit current analysis method based on an extended phase component method is characterized in that: dividing the power transmission system after the fault into a left network and a right network which are independent, respectively writing an equation column based on a phase component model to form a corresponding matrix, further optimizing the matrix, and calculating the single-phase grounding short-circuit current of the typical power transmission system to obtain the detailed distribution condition of the short-circuit current along the OPGW line and the phase line.
An OPGW system grounding short circuit current analysis method based on an extended phase component method is suitable for a power transmission system of a double overhead ground wire of a single-end or double-end power supply, and is characterized by comprising the following steps:
(1) determining a tower with a grounding short circuit in a power transmission system;
(2) writing a voltage loop equation for the mesh columns of all the spans of the whole line according to a KVL law;
(3) simplifying and solving a coefficient matrix of a mesh equation by applying a 'catch-up method' of a block triangular matrix;
(4) and carrying out drawing analysis on the solved result, namely the grounding short-circuit current of the power transmission system, so as to obtain the detailed distribution condition of the short-circuit current on the OPGW.
In step (2), for the mesh voltage loop equation of all spans of the full line, in each OPGW line and each level of mesh of the phase lines, the induced voltage includes the induced voltage to the faulty phase line current for which single-phase grounding occurs within the span and the induced voltage to another overhead ground line.
In the step (3), the 'catching up method' using the block triangular matrix simplifies and solves the coefficient matrix of the mesh equation, which means that the block triangular matrix is solved from small to large after LU decomposition, and the solution corresponds to the 'catching up' process of the 'catching up method'; the solving process of the block triangular matrix from large to small corresponds to the catching up process of the catching up method.
In the step (4), the obtained short-circuit current is plotted, and the specific method comprises the following steps: and drawing all the grounding short-circuit current values on the two OPGW lines from the beginning end to the tail end of the power transmission line to obtain the distribution conditions of the short-circuit currents of the OPGW lines and the phase lines at the position close to the tower with the grounding short circuit and at the position far away from the tower with the short circuit.
The beneficial effect of this application is as follows:
1. when the power transmission system is in a grounding short circuit, a mesh equation is written for each grade of span line of the power transmission system, and a coefficient matrix of the mesh equation is simplified and solved by applying a block triangular matrix 'catching-up method'.
2. When a power transmission system has a grounding short-circuit fault, the short-circuit current on the power transmission line and the short-circuit current on the OPGW line are analyzed and researched.
3. The method is high in reliability and suitable for a complex power transmission system of double overhead ground wires of a 110-500 kV double-side power supply or a single-side power supply.
Drawings
Fig. 1 is a schematic flow chart of an OPGW system ground short circuit current analysis method based on an extended phase component method according to the present invention;
FIG. 2 is a schematic diagram of the circuit operation;
FIG. 3 is a model for computing an overhead transmission line by an extended phase component method.
Detailed Description
The technical scheme of the application is further described in detail through specific embodiments by combining the drawings in the specification.
Fig. 1 shows a schematic flow chart of an OPGW system ground short circuit current analysis method based on an extended phase component method, which is disclosed by the present invention, and the power transmission system ground short circuit current calculation method includes the following steps:
(1) determining the position of a tower with a grounding short circuit in a power transmission system;
(2) according to KVL law, writing a voltage loop equation of the mesh;
(3) simplifying and solving a 'catch-up method' for a coefficient fast matrix of the written loop equation;
3.1, carrying out LU decomposition on the block triangular matrix;
3.2, representing the total span number of the transmission line by n, representing a certain span of the transmission line by i, and completing the tracking process of the block triangular matrix along with the change of i from 1 to n;
3.3, the total span number of the transmission line is represented by n, i represents a certain span of the transmission line, and the 'catching up' process of the block triangular matrix is completed along with the change of i from n to 1.
(4) Solving all mesh equations after combined iteration to obtain short-circuit current on each span of the phase line and each overhead ground wire; the obtained short-circuit current is plotted, and the obtained short-circuit current distribution rule and characteristics are obtained, wherein the method comprises the following specific steps: and drawing the values of all the grounding short-circuit currents on the two OPGW lines from the beginning end to the tail end of the power transmission line to obtain the distribution situations of the short-circuit currents at the position close to the tower with the grounding fault and the position far away from the tower with the short-circuit fault.
The technical solution of the present invention is further described in detail by using the schematic diagram of the power transmission line shown in fig. 2 of the specification as an embodiment.
Fig. 2 shows a schematic diagram of the operation of an overhead transmission line. The figure shows a system consisting of three-phase power conductors and two OPGW lines. The specific meanings of the parameters in the figures are expressed one by one as follows: ea,EbRespectively representing the induced electromotive forces on the two OPGW lines, denoted by Za,ZbThe self-impedances of the two OPGW lines are respectively represented by Ia,IbRepresenting the distributed currents on the two OPGW lines, respectively. In order to reflect the operation of the OPGW line in both horizontal and vertical directions, the present application is referred to with some specific resistors. In the horizontal direction, using a resistor r1,r2To indicate whether the OPGW line is in a section insulation operation mode; in the vertical direction, with k1,k2The grounding modes of the OPGW line at the tower are shown, and specifically include a tower-by-tower grounding mode and a single-point grounding mode. To r1,r2，k1,k2The value of (a) is set to reflect its specific complex operation mode when r is1,r2，k1,k2When the value of (A) is 0, i.e. connection and grounding are considered, when r is1,r2，k1,k2Is infinite, i.e., considered unconnected and ungrounded. Fault indicates the occurrence of a ground short.
FIG. 3 shows a calculation model diagram of an overhead transmission line by an extended phase component method when a ground short circuit occurs.
A mathematical computation model based on the extended phase component method will be described with reference to fig. 3. The power supply of the overhead transmission line is connected with the mathematical model of the line, and the impedance on each span in fig. 2 is represented in a matrixing manner, so that a complete OPGW system grounding short circuit current analysis method based on the extended phase component method can be obtained, and a line is assumed to have n grades, as shown in fig. 3.
For convenience of analysis, the tower position with the grounding short circuit is determined by numbering each grade of span on the whole line. Setting the step at which the power supply is located as the 1 st step, and using E as the longitudinal voltage source on the k step in the linekTo indicate. With EeqTo express the equivalent electromotive force matrix of the line power, since the extended phase component method calculates the phase line and the OPGW line uniformly, there is electromotive force on the first-stage phase line, but the OPGW line has no electromotive force, and actually a matrix containing zero elements, hereinafter, for the sake of uniform description, the electromotive force matrix on the first-stage span is expressed by E1, that is, E1＝Eeq. When the class span is not connected to a power source, or the class mesh is loaded, it is not difficult to obtain Ek0(k ≠ 1); when the step is connected to the line's terminal power supply, E as described above1＝EeqIn the present invention, Z is usedeqThe equivalent impedance of the system is shown, for purposes of uniform description, as Zd0To represent ZeqI.e. Zd0＝Zeq. Further, according to the KVL law, at each step, the voltage loop equation of the relevant mesh can be written as follows:
-Zd0Id0+Z1I1+Zd1Id1＝E1
-Zd1Id1+Z2I2+Zd2Id2＝E2
...
-Zdk-1Idik-1+ZkIk+ZdkIdk＝Ek
...
-Zdn-1Idn-1+ZnIn+ZdnIdn＝En
in the above formula, since in the present inventionThe number of the first step is 1, the number of the power supply side step is 0, n is used for representing the step number of the power transmission line, and Z isd0Representing the equivalent impedance matrix of the transverse branch of the power supply side, Id0Representing the current matrix on the lateral branch of the power supply side. Zd1To ZdnEquivalent impedance matrix, Z, representing the span transverse branch 1, 2, …, n, where the non-power source is located1To ZnEquivalent impedance matrix of the longitudinal branch 1, 2, …, n of the span where the non-power source is located, I1To InThe current matrix representing the 1 st, 2 nd, … th, n th gear in the longitudinal direction of the span in which the non-power source is located, is written as the matrix as follows:
E＝ZI
in the above formula, I has the following meaning:
I＝[I1I2...Ii...In-1In]T
in the above formula, E has the following meaning:
E＝[E1E2...Ei...En-1En]T
the matrix associated in the above equation is explained below. In the above formula, I represents a longitudinal current, wherein the element IiIs a block matrix. I isiA column vector of size y × 1 (where y represents the number of columns of the column vector) is composed of currents on the ith stage; and E in the above formula represents a longitudinal voltage block matrix on the whole power transmission line. EiThe matrix size of (a) is a column vector of size y x 1, which is composed of vertical voltages on each conductor on the ith step. It is noted that E is the longitudinal voltage in the range connected to the power supplyiInstead of a matrix with all 0 elements, the longitudinal voltages on other spans of the whole transmission line are a matrix with all 0 elements.
Where Z is a block tri-diagonal matrix, as shown below:
wherein Zeqi＝Zdi-1+Zi+Zdi(1≤i≤n)。
It is not difficult to obtain from the above analysis, if the step number of the whole transmission line is n, then Z is a block triangular matrix with the matrix size of y × n. In a relatively common situation, the step number of a transmission line may be tens of steps or even hundreds of steps. In this case, the order of the block triangular matrix is a relatively large case. If the Gauss elimination method is used to process the equation set, the overall calculation efficiency and speed are not very fast. But it can be solved using the "catch-up method". Because, the block triangular matrix is highly sparse and is a diagonal dominant feature.
Note that the simplification of the block triangular matrix by the "catch-up method" can greatly improve the calculation speed and the calculation efficiency, because the reduction effect on the operation times is significant, the method is a good method for solving the large matrix. As mentioned above, the solution for calculating the short-circuit current distribution on the OPGW line by applying the extended phase component method mentioned in the present application has a good adaptability.
The following describes the procedure of performing "catch-up" decomposition on the block triangular matrix Z, and after performing LU decomposition on the block triangular matrix, where the expressions of L and U are as follows:
in the above formula, during LU decomposition, the L matrix and the U matrix can be subdivided into different element compositions, and G in the L matrixi、PiAll sub-matrices of y x y order (where y denotes the number of columns of the row vector), D in the U matrixiIs a sub-matrix of order y x y (where y denotes the number of columns of the column vector), OiIs an identity matrix of order y x y (where y represents the number of columns of the column vector). The original equation can be written as:
E＝LUI
namely, it is
In the above equation, E, I denotes a lateral power matrix and a lateral current matrix, respectively; l and U respectively represent the block mode of the coefficient matrix after LU decomposition, and then the non-zero elements in L and U can be determined by a undetermined coefficient method.
Where i is 2, 3, …, n.
Therefore, the first and second electrodes are formed on the substrate,
where i is 2, 3, …, n.
Then, the following is obtained from Y ═ UI:
where i is n-1, n-2, …, 1.
With i varying from 1 to n, wherein YiThe solution process of the block triangular matrix from small to large is shown, which corresponds to the pursuit process of the pursuit method; with i varying from n to 1, E in the above formulai' show the solving process of the block triangular matrix from large to small, which corresponds to the ' catching up ' process of the ' catching up method '. By solving as above, it is not difficult to obtain the following formula:
I＝Z-1E
according to the above formula, the distribution of each section of current, namely, the short-circuit current of each phase line and each span of each OPGW line can be obtained.
The step of drawing the obtained short-circuit current is to draw by taking the span number of the overhead power transmission network as an abscissa value and the grounding short-circuit current distributed on each OPGW line as an ordinate value, wherein the size of the single-phase grounding short-circuit current value on each span can be clearly seen in the drawing, and the distance range with larger grounding short-circuit influence is analyzed according to the size of the short-circuit current value.
Claims (3)
1. An OPGW system grounding short-circuit current analysis method based on an extended phase component method is suitable for a power transmission system of a double overhead ground wire of a single-end or double-end power supply, divides the power transmission system after a fault into a left independent network and a right independent network, and respectively carries out equation column writing based on a phase component model to form a corresponding matrix so as to obtain the detailed distribution condition of short-circuit current along an OPGW line and a phase line; characterized in that the method comprises the following steps:
(1) determining a tower with a grounding short circuit in a power transmission system;
(2) writing a voltage loop equation for the mesh columns of all the spans of the whole line according to a KVL law; for mesh voltage loop equations of all spans of the whole line, in each level of meshes of each OPGW line and phase line, the induced voltage comprises the induced voltage of the fault phase line current with single-phase grounding in the span and the induced voltage of the other overhead ground line;
using Ea,EbRespectively representing the induced electromotive forces on the two OPGW lines, denoted by Za,ZbThe self-impedances of the two OPGW lines are respectively represented by Ia,IbCurrents respectively representing the distributions on the two OPGW lines; in order to reflect the operation mode of OPGW line in horizontal direction and vertical direction, in horizontal direction, resistor r is used1,r2To indicate whether the OPGW line is in a section insulation operation mode; in the vertical direction, with k1,k2The grounding mode of the OPGW at the tower is represented, and specifically comprises a tower-by-tower grounding mode and a single-point grounding mode; to r1,r2，k1,k2The value of (a) is set to reflect its specific complex operation mode when r is1,r2，k1,k2When the value of (A) is 0, i.e. connection and grounding are considered, when r is1,r2，k1,k2When the value of (a) is infinite, i.e., no connection and no ground are considered; performing matrix representation on impedance on each grade of span, numbering each grade of span on the whole line, determining the position of the tower with grounding short circuit, setting the span of the stage where the power supply is located as the 1 st grade, and using E as a longitudinal voltage source on the k-th grade of span in the linekTo express, the phase line and the OPGW line are calculated uniformly, electromotive force exists on the first-stage phase line, but the OPGW line has no electromotive force, and is actually a matrix containing zero elements, and a voltage loop equation of the relevant mesh is written on each stage according to a KVL law;
(3) simplifying and solving a coefficient matrix of a mesh equation by applying a 'catch-up method' of a block triangular matrix; (4) and carrying out drawing analysis on the solved result, namely the grounding short-circuit current of the power transmission system, so as to obtain the detailed distribution condition of the OPGW line short-circuit current.
2. The OPGW system ground short circuit current analysis method based on the extended phase component method as claimed in claim 1, wherein:
in the step (3), the 'catching up method' using the block triangular matrix simplifies and solves the coefficient matrix of the mesh equation, which means that the block triangular matrix is solved from small to large after LU decomposition, and the solution corresponds to the 'catching up' process of the 'catching up method'; the solving process of the block triangular matrix from large to small corresponds to the catching up process of the catching up method.
3. The OPGW system ground short circuit current analysis method based on the extended phase component method as claimed in claim 1 or 2, wherein:
in the step (4), the obtained short-circuit current is plotted, and the specific method comprises the following steps: and drawing all the grounding short-circuit current values on the two OPGW lines from the beginning end to the tail end of the power transmission line to obtain the distribution conditions of the short-circuit currents of the OPGW lines and the phase lines at the position close to the tower with the grounding short circuit and at the position far away from the tower with the short circuit.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941138A (en) * | 2014-04-16 | 2014-07-23 | 华北电力大学 | OPGW whole-wire monitoring and diagnosing system and method |
| CN104007306A (en) * | 2014-04-21 | 2014-08-27 | 天津电力设计院 | Method for obtaining OPGW total current generated when overhead transmission line is in unbalanced short circuit |
-
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941138A (en) * | 2014-04-16 | 2014-07-23 | 华北电力大学 | OPGW whole-wire monitoring and diagnosing system and method |
| CN104007306A (en) * | 2014-04-21 | 2014-08-27 | 天津电力设计院 | Method for obtaining OPGW total current generated when overhead transmission line is in unbalanced short circuit |
Non-Patent Citations (2)
| Title |
|---|
| 复杂结构输电线路接地短路及OPGW电流计算研究;张云鹏;《中国优秀硕士学位论文全文数据库（工程科技II辑）》;20120915;摘要，正文第3-4章 * |
| 复杂结构输电线路接地短路及光纤复合架空地线电流计算;张云鹏 等;《电力系统自动化》;20150825;第39卷(第16期);摘要，正文第1-2小节 * |
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