CN110609205A - A method for fault location of distribution network based on comprehensive information matrix - Google Patents

Abstract

The invention discloses a method for fault location of a distribution network based on a comprehensive information matrix. The method comprises the following steps: obtaining a network information matrix through network topology; obtaining a protection information matrix through protection action information sent by faults; The information matrix and the protection information matrix are operated to obtain a comprehensive information matrix; the fault interval judgment is carried out through the comprehensive information matrix; the present invention is simple to implement, convenient for program realization, can accurately judge the fault zone, and reduces the power failure area and power failure time.

Description

A method for fault location of distribution network based on comprehensive information matrix

technical field

The invention relates to a method for locating faults in a distribution network based on a comprehensive information matrix, and belongs to the technical field of electric power.

Background technique

The modern power grid occupies an important position in the national economy and people's life, and its scale, capacity and coverage are getting larger and larger, and users have higher and higher requirements for power quality, and higher requirements for power supply reliability. The National Electric Power Company also clearly put forward the goal that the reliability of power supply should reach 99.96%, and improving distribution automation is an important guarantee to achieve this goal. When a fault occurs in the distribution network, the existing technology cannot quickly and accurately locate and isolate the faulted section, which increases the power outage area and the outage time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for locating distribution network faults based on a comprehensive information matrix, so as to solve the defect in the prior art that when the above-mentioned distribution network fails, the fault section cannot be accurately located and isolated.

A method for locating faults in a distribution network based on a comprehensive information matrix, the method comprising the following steps:

Obtain network information matrix through network topology;

Obtain the protection information matrix through the protection action information sent by the fault;

Perform operations on the network information matrix and the protection information matrix to obtain a comprehensive information matrix;

The fault interval judgment is performed through the comprehensive information matrix.

Preferably, the network information matrix is obtained by the following methods:

Taking the circuit breaker, sectional switch and tie switch on the feeder of the distribution network as nodes, the closing position is represented by 1, and the quantile position is represented by 0. Suppose there are m nodes in a distribution network as an example, construct m×m network information matrix;

If there is a feeder connection between the i-th node and the j-th node, the value of the m _ij and m _ji matrix elements is 1, otherwise there is no feeder connection, then the matrix when the m _ij and m _ji matrix elements are set to 0 is: Network information matrix N.

Preferably, the protection information matrix is obtained by the following method:

According to the protection action information sent by the distribution network terminal, the protection information m×m matrix is formed;

Suppose that the terminal of the switching device of the ith node has a protection action, then the elements of the ith row and the ith column of the protection information matrix are all set to 0, otherwise set to 1, and all other elements are set to 0.

Preferably, the comprehensive information matrix is obtained by the following methods:

Multiply the network information matrix and the protection information matrix to obtain the result matrix;

A comprehensive information matrix is obtained by normalizing the result matrix.

Preferably, the standardization process includes the following steps:

If the elements N _mj , N _nj , ..., N _kj in the network information matrix are 1, and R _jj = 1 in the protection information matrix, standardize the elements in the jth row and the jth column in the result matrix, if the result If at least 2 of O _mm , O _nn , ... O _kk in the matrix are 0, then all the elements in the jth row and the jth column of the result matrix are set to 0, otherwise they remain unchanged.

Preferably, the method for judging the obstacle interval includes the following steps:

If the element A _ij XORA _ji in the comprehensive information matrix is 1, the section between the i-th and j-th nodes on the feeder is faulty, and the switch devices of the i-node and the j-node are disconnected during fault isolation.

Compared with the prior art, the present invention achieves the beneficial effects: the present invention is simple to implement through an algorithm, convenient for program implementation, and can accurately determine the faulty section.

Detailed ways

In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.

The invention discloses a method for locating faults in a distribution network based on a comprehensive information matrix. The method includes the following steps:

Step 1, first define a network topology network information matrix according to the distribution network network topology structure, and this matrix represents the connection information between actual network nodes;

Step 2, generating a protection information matrix according to the protection action information sent by the distribution network terminal when the distribution network fails;

Step 3. Finally, combine the above two matrices to standardize the multiplication results to generate a comprehensive information matrix,

Step 4, judge the fault interval through the comprehensive information matrix.

Specifically, the network information matrix acquisition method is as follows: the circuit breaker, segment switch, and tie switch on the distribution network feeder are used as nodes, the combined position is represented by 1, and the quantile is represented by 0. Suppose that a distribution network has m nodes: For example, construct an m×m network information matrix. If there is a feeder connection between the i-th node and the j-th node, the value of the matrix elements of m _ij and m _ji is 1. Otherwise, if there is no feeder connection, the matrix elements of m _ij and m _ji are set to 0. This matrix is the network Information matrix N.

Specifically, the acquisition method of the protection information matrix is as follows: the protection information m×m matrix is formed according to the protection action information sent by the terminal of the distribution network. All elements in column i are set to 0, otherwise set to 1, and all other elements are set to 0.

Specifically, the method for obtaining the comprehensive information matrix is to multiply the network information matrix N and the protection information matrix R to obtain the result matrix O, and standardize the result matrix O to obtain the comprehensive information matrix A. The standardization process is as follows. When the elements N _mj , N _nj , ..., N _kj of , are 1, and R _jj = 1 in the matrix R, the elements in the jth row and the jth column in the result matrix need to be standardized. If O _mm in the matrix O, If at least 2 of O _nn ,...O _kk are 0, then all the elements in the jth row and the jth column of the matrix O are set to 0, otherwise they remain unchanged.

Specifically, the method for judging the fault interval is as follows: the comprehensive information matrix A reflects the fault zone. If the element A _ij XORA _ji in the matrix A is 1, then the zone between the i-th and jth nodes on the feeder is faulty, and the fault is isolated. The i and j node switching devices should be disconnected.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (6)

1. a method for fault location of distribution network based on comprehensive information matrix, is characterized in that, described method comprises the steps: Obtain network information matrix through network topology; Obtain the protection information matrix through the protection action information sent by the fault; Perform operations on the network information matrix and the protection information matrix to obtain a comprehensive information matrix; The fault interval judgment is performed through the comprehensive information matrix. 2. The method for locating power distribution network faults based on a comprehensive information matrix according to claim 1, wherein the network information matrix is obtained by the following methods: Taking the circuit breaker, sectional switch and tie switch on the feeder of the distribution network as nodes, the closing position is represented by 1, and the quantile position is represented by 0. Suppose there are m nodes in a distribution network as an example, construct m×m network information matrix; If there is a feeder connection between the i-th node and the j-th node, the value of the m _ij and m _ji matrix elements is 1, otherwise there is no feeder connection, then the matrix when the m _ij and m _ji matrix elements are set to 0 is: Network information matrix N. 3. The method for locating faults in distribution network based on a comprehensive information matrix according to claim 1, wherein the protection information matrix is obtained by the following methods: According to the protection action information sent by the distribution network terminal, the protection information m×m matrix is formed; Assuming that the terminal of the i-th node switch device has a protection action, then the elements of the i-th row and the i-th column of the protection information matrix are all set to 0, otherwise the i-th row and the i-th column are set to 1, and all other elements are set to 0, which constitutes protection information. matrix. 4. The method for locating faults in a distribution network based on a comprehensive information matrix according to claim 1, wherein the comprehensive information matrix is obtained by the following methods: Multiply the network information matrix and the protection information matrix to obtain the result matrix; A comprehensive information matrix is obtained by normalizing the result matrix. 5. The method for locating faults in a distribution network based on a comprehensive information matrix according to claim 4, wherein the standardized processing process comprises the following steps: If the elements N _mj , N _nj , ..., N _kj in the network information matrix are 1, and R _jj = 1 in the protection information matrix, standardize the elements in the jth row and the jth column in the result matrix, if the result If at least 2 of O _mm , O _nn , ... O _kk in the matrix are 0, then all the elements in the jth row and the jth column of the result matrix are set to 0, otherwise they remain unchanged. 6. The method for locating faults in a distribution network based on a comprehensive information matrix according to claim 1, wherein the method for judging the fault interval comprises the following steps: If the element A _ij XORA _ji in the comprehensive information matrix is 1, the section between the i-th and j-th nodes on the feeder is faulty, and the switch devices of the i-node and the j-node are disconnected during fault isolation.