Distribution network fault location method and system based on micro-pmu and binary search

A distribution network fault and location method technology, applied in the direction of fault location, fault detection according to conductor type, system integration technology, etc., can solve the problems of slow calculation speed, poor fault location accuracy, and inability to obtain the precise location of the fault point, etc., to achieve Effects of reducing power outage area, fast and accurate fault location, improving power supply quality and reliability

Active Publication Date: 2020-05-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The new method of active distribution network fault location based on the voltage deviation vector 2-norm proposed by Dai Zhihui et al. is aimed at the complex structure of the distribution network and the unbalanced three-phase situation, and proposes a fault section location method based on the voltage deviation 2-norm. However, the precise location of the fault point cannot be obtained
Therefore, the existing fault location methods have the problems of slow calculation speed and poor fault location accuracy

Method used

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  • Distribution network fault location method and system based on micro-pmu and binary search
  • Distribution network fault location method and system based on micro-pmu and binary search
  • Distribution network fault location method and system based on micro-pmu and binary search

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Embodiment 1

[0041] figure 1 A flow chart of a distribution network fault location method based on micro-PMU and binary search in this embodiment is given.

[0042] Such as figure 1 As shown, a distribution network fault location method based on micro-PMU and dichotomy search in this embodiment includes:

[0043] S101: Use the micro PMU under the fault-observable configuration to measure the current at the power supply and the load before and after the fault, calculate the positive sequence component of the fault current at the fault point and inject it into the assumed fault point, and construct a positive sequence fault additional component network.

[0044] Because all types of faults in the distribution network include positive-sequence components, and negative-sequence components are not included in symmetrical faults, and sometimes the zero-sequence parameters of the distribution network lines are not easy to obtain, so the embodiments of the present disclosure carry out faults base...

Embodiment 2

[0128] Such as Figure 9 As shown, a distribution network fault location system based on micro PMU and dichotomy search in this embodiment includes:

[0129] (1) Positive-sequence fault additional component network construction module, which is used to measure the current at the power supply and load before and after the fault by using the micro-PMU under the fault-observable configuration, calculate the positive-sequence component of the fault current at the fault point and inject it into the assumed fault point, and construct Positive-sequence fault additional component network;

[0130] In the construction module of the positive-sequence fault additional component network, under the condition of considerable faults, the micro PMU equipment is installed at the root node of the main network, load nodes and distributed power supply nodes of the positive-sequence fault additional component network.

[0131] In the positive sequence fault additional component network constructi...

Embodiment 3

[0138] This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following figure 1 The steps in the distribution network fault location method based on micro-PMU and binary search are shown.

[0139]In this embodiment, the fault current component at the fault point is calculated by measuring the current of each PMU configuration node before and after the fault. In the fault component network, the fault point is searched for each line in turn based on the dichotomy method, and the admittance matrix and the fault current normal The sequence component calculates the positive sequence voltage of each PMU configuration node, and the deviation norm between the actual measured value and the actual measurement value is the smallest to determine the actual fault point, which realizes fast and accurate fault location after the fault, effectively reduces the power outage area and shortens the u...

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Abstract

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

Description

technical field [0001] The disclosure belongs to the field of distribution network fault location, and in particular relates to a distribution network fault location method and system based on micro-PMU and dichotomous search. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As the end of the power grid directly connected to power users, the reliable and stable operation of the distribution network will directly affect the satisfaction of users with respect to power supply safety and power quality. After a fault, quickly and accurately determining the location of the fault point can effectively reduce the power outage area and shorten the power outage time of users, thereby effectively improving the power supply quality and reliability of the power grid. [0004] In the current research, the precise fault location algorithms of distributi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y02E40/70Y02E60/00Y04S10/22
Inventor 贠志皓宋哲
Owner SHANDONG UNIV
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