CN-121995153-A - Power distribution network voltage disturbance source positioning method, device, medium and program product

CN121995153ACN 121995153 ACN121995153 ACN 121995153ACN-121995153-A

Abstract

The application discloses a method, a device, a medium and a program product for positioning a power distribution network voltage disturbance source, which belong to the field of positioning. And constructing an error function by combining the electric distance matrix and the disturbance propagation speed to determine a preliminary disturbance source node, and verifying whether the preliminary disturbance source node is an actual disturbance source or not by a parameter identification method. If verification is passed, calculating deviation between a theory and an actual disturbance arrival time, evaluating a positioning error, and finally obtaining a high-precision disturbance source positioning result.

Inventors

CHEN ZETAO
ZHOU YI
LIAO WEIYAN
PANG JIANJUN
MO ZHIHAO
Rui Qingtao
QIN JUNHAO
LIU CHANG

Assignees

广东电网有限责任公司广州供电局

Dates

Publication Date: 20260508
Application Date: 20251201

Claims (10)

1. The utility model provides a distribution network voltage disturbance source positioning method which is characterized by comprising the following steps: Acquiring network topology parameters, line impedance parameters and real-time voltage monitoring data of each node of the power distribution network; constructing an equivalent impedance matrix among nodes of the power distribution network based on the network topology parameters and the line impedance parameters, and calculating to obtain an electric distance matrix among the nodes based on the equivalent impedance matrix; Identifying voltage disturbance events of the power distribution network according to the real-time voltage monitoring data, and extracting response time differences of triggering voltage disturbance of each first node, wherein each first node is a node meeting preset voltage disturbance judgment conditions; Based on the response time difference and a preset disturbance propagation speed, combining the electric distance matrix, constructing a disturbance propagation path error function, and determining a preliminary disturbance source node by minimizing the error function; Verifying the preliminary disturbance source node by a preset parameter identification method based on the electric distance matrix and a preset disturbance propagation speed, and judging whether the preliminary disturbance source node is an actual disturbance source or not; if the preliminary disturbance source node is an actual disturbance source, calculating the deviation between the theoretical disturbance arrival time and the actual disturbance arrival time of each first node, and evaluating the positioning error of the preliminary disturbance source node based on the deviation to obtain the positioning result of the actual disturbance source.
2. The method for positioning a voltage disturbance source of a power distribution network according to claim 1, wherein the constructing an equivalent impedance matrix between nodes of the power distribution network based on the network topology parameter and the line impedance parameter, and calculating based on the equivalent impedance matrix to obtain an electrical distance matrix between the nodes comprises the following specific steps: Constructing a node model comprising a transformer, a load and a photovoltaic access point in the power distribution network; Based on the network topology parameter and the line impedance parameter, calculating the self impedance of each node and the transimpedance between any two nodes by combining the node model; Arranging all self-impedance and mutual impedance according to node serial numbers to obtain an equivalent impedance matrix among all nodes of the power distribution network; Calculating the electrical distance between any two nodes based on the resistance value and the reactance value corresponding to each element in the equivalent impedance matrix; and arranging the electrical distances among all the nodes according to the node serial numbers to obtain an electrical distance matrix among all the nodes of the power distribution network.
3. The method for positioning a voltage disturbance source of a power distribution network according to claim 1, wherein the identifying voltage disturbance events of the power distribution network according to the real-time voltage monitoring data extracts response time differences of triggering voltage disturbance of each first node, specifically: collecting real-time voltage monitoring data of each node through a preset voltage sampling device; Comparing the real-time voltage monitoring data of each node with preset voltage disturbance judging conditions, judging that a voltage disturbance event occurs in the power distribution network if the real-time voltage monitoring data of any node meets the voltage disturbance judging conditions, and acquiring the voltage disturbance triggering time of each first node meeting the voltage disturbance judging conditions; And calculating each difference value between the voltage disturbance trigger time of each remaining node in each first node and the reference time by taking the initially acquired voltage disturbance trigger time as the reference time, and taking each difference value as the response time difference of each first node trigger voltage disturbance.
4. The method for positioning a voltage disturbance source of a power distribution network according to claim 1, wherein the step of constructing a disturbance propagation path error function based on the response time difference and a preset disturbance propagation speed in combination with the electrical distance matrix, and determining a preliminary disturbance source node by minimizing the error function is specifically: Comparing the response time difference of each first node with a preset maximum response time threshold, and screening out nodes with the response time difference smaller than the maximum response time threshold to obtain a first candidate node set; Extracting initial voltage jump amplitude values of voltage disturbance trigger moments of all first nodes, comparing the initial voltage jump amplitude values with preset initial voltage jump threshold values, screening nodes with the initial voltage jump amplitude values larger than the initial voltage jump threshold values, and obtaining a second candidate node set; acquiring an intersection of the first candidate node set and the second candidate node set to obtain a candidate disturbance source node set; Extracting each electrical distance from each candidate node to each first node from the electrical distance matrix based on each candidate node in the candidate disturbance source node set; calculating theoretical response time of each candidate node according to each electrical distance and by combining a preset disturbance propagation speed; Comparing the theoretical response time with the actual response time difference of each candidate node to construct a disturbance propagation path error function, wherein the error function is used for representing the deviation degree of the theoretical response time and the actual response time difference; And according to the disturbance propagation path error function, calculating each error function value of each candidate node in the candidate disturbance source node set, and selecting the smallest candidate node in each error function value to be determined as the primary disturbance source node.
5. The method for positioning a voltage disturbance source of a power distribution network according to claim 1, wherein the verifying the preliminary disturbance source node by a preset parameter identification method based on the electrical distance matrix and a preset disturbance propagation speed is used for determining whether the preliminary disturbance source node is an actual disturbance source, specifically: Extracting the electrical distance from the primary disturbance source node to each first node from the electrical distance matrix by taking the primary disturbance source node as a reference; Calculating initial theoretical disturbance arrival time of disturbance signals of the primary disturbance source nodes transmitted to each first node by combining preset disturbance transmission speed; extracting initial actual disturbance arrival time of each first node from real-time voltage monitoring data, wherein the initial actual disturbance arrival time is when each first node first meets the voltage disturbance judgment condition; comparing the difference value of the initial actual disturbance arrival time of any two nodes with the difference value of the initial theoretical disturbance arrival time, and calculating a rank correlation coefficient; And if the rank correlation coefficient meets a preset judgment threshold, judging that the preliminary disturbance source node is an actual disturbance source.
6. The method for positioning a voltage disturbance source of a power distribution network according to claim 1, wherein if the preliminary disturbance source node is an actual disturbance source, calculating a deviation between a theoretical disturbance arrival time and an actual disturbance arrival time of each first node, and evaluating a positioning error of the preliminary disturbance source node based on the deviation to obtain a positioning result of the actual disturbance source, which specifically includes: If the preliminary disturbance source node is judged to be an actual disturbance source, calculating theoretical disturbance arrival time of each first node again by taking the preliminary disturbance source node as a reference and combining the electrical distance between the preliminary disturbance source node and each first node in the electrical distance matrix and a preset disturbance propagation speed; Extracting actual disturbance arrival time of each first node from real-time voltage monitoring data, and calculating a difference value between theoretical disturbance arrival time and actual disturbance arrival time of each first node to obtain disturbance time deviation of each first node; Counting the disturbance moment deviations of all the first nodes, and calculating an arithmetic average value of all the disturbance moment deviations as an average positioning error; Screening out the deviation value with the largest absolute value from all disturbance moment deviations as the largest positioning error; And taking the average positioning error and the maximum positioning error as positioning error evaluation results, and combining the position information of the actual disturbance source node to obtain the positioning result of the actual disturbance source.
7. A power distribution network voltage disturbance source positioning device, comprising: The acquisition module is used for acquiring network topology parameters, line impedance parameters and real-time voltage monitoring data of each node of the power distribution network; The construction module is used for constructing an equivalent impedance matrix among all nodes of the power distribution network based on the network topology parameters and the line impedance parameters, and calculating to obtain an electric distance matrix among all nodes based on the equivalent impedance matrix; the extraction module is used for identifying voltage disturbance events of the power distribution network according to the real-time voltage monitoring data and extracting response time differences of triggering voltage disturbance of each first node, wherein each first node is a node meeting preset voltage disturbance judgment conditions; The determining module is used for constructing a disturbance propagation path error function by combining the electric distance matrix based on the response time difference and the preset disturbance propagation speed, and determining a preliminary disturbance source node by minimizing the error function; The judging module is used for verifying the preliminary disturbance source node through a preset parameter identification method based on the electric distance matrix and a preset disturbance propagation speed, and judging whether the preliminary disturbance source node is an actual disturbance source or not; and the positioning module is used for calculating the deviation between the theoretical disturbance arrival time and the actual disturbance arrival time of each first node if the preliminary disturbance source node is an actual disturbance source, and evaluating the positioning error of the preliminary disturbance source node based on the deviation to obtain the positioning result of the actual disturbance source.
8. The power distribution network voltage disturbance source positioning device according to claim 7, wherein the disturbance propagation path error function is constructed by combining the electrical distance matrix based on the response time difference and a preset disturbance propagation speed, and the preliminary disturbance source node is determined by minimizing the error function, specifically: Comparing the response time difference of each first node with a preset maximum response time threshold, and screening out nodes with the response time difference smaller than the maximum response time threshold to obtain a first candidate node set; Extracting initial voltage jump amplitude values of voltage disturbance trigger moments of all first nodes, comparing the initial voltage jump amplitude values with preset initial voltage jump threshold values, screening nodes with the initial voltage jump amplitude values larger than the initial voltage jump threshold values, and obtaining a second candidate node set; acquiring an intersection of the first candidate node set and the second candidate node set to obtain a candidate disturbance source node set; Extracting each electrical distance from each candidate node to each first node from the electrical distance matrix based on each candidate node in the candidate disturbance source node set; calculating theoretical response time of each candidate node according to each electrical distance and by combining a preset disturbance propagation speed; Comparing the theoretical response time with the actual response time difference of each candidate node to construct a disturbance propagation path error function, wherein the error function is used for representing the deviation degree of the theoretical response time and the actual response time difference; And according to the disturbance propagation path error function, calculating each error function value of each candidate node in the candidate disturbance source node set, and selecting the smallest candidate node in each error function value to be determined as the primary disturbance source node.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program when run controls a device in which the computer readable storage medium is located to perform the method for positioning a disturbance source of a voltage of a distribution network according to any one of claims 1to 6.
10. A computer program product comprising a computer program or instructions which, when executed by a communication device, implements a method of positioning a source of voltage disturbance of a power distribution network according to any of claims 1 to 6.

Description

Power distribution network voltage disturbance source positioning method, device, medium and program product Technical Field The invention relates to the field of positioning, in particular to a method, a device, a medium and a program product for positioning a power distribution network voltage disturbance source. Background In the operation process of a modern power distribution network, along with the rapid popularization and access of distributed energy sources such as photovoltaic power and wind power, and the continuous increase of diversified loads such as electric heavy truck, variable frequency air conditioner and the like, the occurrence frequency and the complexity of voltage disturbance events are obviously improved. Meanwhile, sudden changes of loads, line switching actions, fault switching operations and the like can also cause transient or continuous voltage disturbance, the problems not only affect the normal operation of terminal electric equipment, but also form potential risks for safe and stable operation of a power distribution network, and cascading failures can be caused when serious, so that the continuity and reliability of power supply are threatened. The existing power distribution network voltage disturbance source positioning method has various limitations, and is difficult to meet the accurate positioning requirement under complex working conditions. The method relies on synchronous phasor measurement equipment, has extremely high requirements on the clock synchronization precision, is high in equipment deployment and maintenance cost, is unfavorable for large-scale popularization and application, simply depends on voltage amplitude or phase difference analysis, neglects non-uniformity of network parameters of a power distribution network, is easily influenced by line impedance difference and topological structure complexity, and causes larger positioning error, and the method is based on a tide inversion technology, has strong dependence on accuracy of network parameters and a load model, and is often invalid due to problems of uncertainty of parameters, data noise, incomplete data and the like in practical application. In addition, the traditional positioning method generally lacks an effective secondary verification mechanism, is difficult to quantitatively verify a primary positioning result, is easy to generate false alarm or missing detection, cannot provide reliable basis for subsequent power quality control, and cannot accurately and efficiently position a voltage disturbance source of a power distribution network due to the defects in the prior art. Disclosure of Invention The invention provides a method, a device, a medium and a program product for positioning a voltage disturbance source of a power distribution network, which are used for solving the problem that the voltage disturbance source of the power distribution network cannot be accurately and efficiently positioned in the prior art. In a first aspect, the present application provides a method for positioning a voltage disturbance source of a power distribution network, including: Acquiring network topology parameters, line impedance parameters and real-time voltage monitoring data of each node of the power distribution network; constructing an equivalent impedance matrix among nodes of the power distribution network based on the network topology parameters and the line impedance parameters, and calculating to obtain an electric distance matrix among the nodes based on the equivalent impedance matrix; Identifying voltage disturbance events of the power distribution network according to the real-time voltage monitoring data, and extracting response time differences of triggering voltage disturbance of each first node, wherein each first node is a node meeting preset voltage disturbance judgment conditions; Based on the response time difference and a preset disturbance propagation speed, combining the electric distance matrix, constructing a disturbance propagation path error function, and determining a preliminary disturbance source node by minimizing the error function; Verifying the preliminary disturbance source node by a preset parameter identification method based on the electric distance matrix and a preset disturbance propagation speed, and judging whether the preliminary disturbance source node is an actual disturbance source or not; if the preliminary disturbance source node is an actual disturbance source, calculating the deviation between the theoretical disturbance arrival time and the actual disturbance arrival time of each first node, and evaluating the positioning error of the preliminary disturbance source node based on the deviation to obtain the positioning result of the actual disturbance source. According to the application, by acquiring network topology parameters and line impedance parameters of the power distribution network and combining real-time voltage monitoring data of each node, a