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Power distribution network complex fault positioning method based on D-PMU limited node information

A technology of node information and positioning method, applied in fault location, information technology support system, fault detection according to conductor type, etc., can solve the problems of increasing the probability of occurrence of disconnection faults and increasing the complexity of faults in distribution network

Inactive Publication Date: 2020-04-28
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of extreme weather has greatly increased the probability of disconnection faults in the distribution network, and most of them are complex and multiple faults, which increases the complexity of faults and brings great challenges to the realization of protection reliability, quickness, selectivity and sensitivity. challenge

Method used

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  • Power distribution network complex fault positioning method based on D-PMU limited node information
  • Power distribution network complex fault positioning method based on D-PMU limited node information
  • Power distribution network complex fault positioning method based on D-PMU limited node information

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Embodiment 1

[0051] This embodiment discloses a distribution network complex fault location method based on D-PMU limited node information. First, the D-PMU is optimally configured based on the distribution network topology and combined with the fault location algorithm; secondly, here On the basis of D-PMU configuration, the concept of monitoring range set is proposed, and the distribution network is divided into different range sets according to certain constraints, and they are classified into three types, which are used as the basis of the fault location algorithm; finally, through Criterion determines the suspicious range set, and conducts unbalanced current algorithm research, and discusses and analyzes according to the situation. Multiple faults are a combination of single faults, and the content of the invention of the single fault will be further explained first. The fault location process of the present invention is as follows figure 1 shown.

[0052] Step 1, optimized arrangeme...

Embodiment 2

[0109] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, the following steps are implemented, including:

[0110] Under the premise of satisfying the constraints of the power grid and the objective function, realize the optimal configuration of the least optimal D-PMU nodes;

[0111] Based on the optimal configuration of D-PMU, the distribution network topology is divided into monitoring range sets. The division of monitoring range sets should reduce the number of D-PMUs as much as possible while ensuring accurate fault location;

[0112] On the basis of the division of the monitoring range set, the suspicious range set is determined by the sudden change of the phase current in the monitoring range set to 0 or the differential current exceeding the threshold;

[0113] An unbalanced current fault location algorithm i...

Embodiment 3

[0115] The purpose of this embodiment is to provide a computer-readable storage medium.

[0116] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are performed:

[0117] Under the premise of satisfying the constraints of the power grid and the objective function, realize the optimal configuration of the least optimal D-PMU nodes;

[0118] Based on the optimal configuration of D-PMU, the distribution network topology is divided into monitoring range sets. The division of monitoring range sets should reduce the number of D-PMUs as much as possible while ensuring accurate fault location;

[0119] On the basis of the division of the monitoring range set, the suspicious range set is determined by the sudden change of the phase current in the monitoring range set to 0 or the differential current exceeding the threshold;

[0120] An unbalanced current fault location algorithm is proposed, ...

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Abstract

The invention discloses a power distribution network complex fault positioning method based on D-PMU limited node information. The method comprises the steps: achieving optimal configuration of leastoptimal D-PMU nodes under a condition that a power grid constraint condition and a target function are met; on the basis of D-PMU optimal configuration, carrying out monitoring range set division on atopological structure of a whole power distribution network, wherein a divided monitoring range set should reduce the number of D-PMUs as much as possible while faults are ensured to be accurately positioned; on the basis of monitoring range set division, determining a suspicious range set by abruptly changing a phase current in a monitoring range set to 0 or enabling a differential current to exceed a threshold value; and proposing an unbalanced current fault positioning algorithm, calculating an unbalanced current value of each node in the suspicious range set, and comparing the unbalancedcurrent values of the nodes in a suspicious fault domain so as to determine a complex fault position.

Description

technical field [0001] The invention belongs to the technical field of electric power system distribution network protection, and in particular relates to a complex fault location method of distribution network based on D-PMU limited node information. 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] The distribution network is the last link in the four links of "generation, transformation, transmission and distribution", and occupies a very important position in the power system. However, due to some reasons, in the past, my country paid more attention to power generation and transmission, while ignoring the development of power distribution, which led to a sluggish development of distribution network. At the same time, the neutral point of my country's distribution network generally adopts a small current grounding method, which makes it...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y02E40/70Y02E60/00Y04S10/22
Inventor 孙旭日张松李文升孙振海彭博陈明魏振张健磊高湛军
Owner STATE GRID SHANDONG ELECTRIC POWER
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