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Distribution Network Pilot Protection Method and System Based on Positive Sequence Fault Component Energy Direction

A fault component and fault direction technology, applied in emergency protection circuit devices, information technology support systems, electrical components, etc., can solve problems affecting the protection effect of active distribution networks, high requirements for communication and data synchronization, and faults in the area , to achieve high sensitivity and tolerance to transition resistance, low communication bandwidth requirements, and good economical effects

Active Publication Date: 2022-05-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the unmeasurable load inside the feeder is switched, the method may be misjudged as an internal fault
[0010] To sum up, the inventors found that the existing active distribution network protection methods may be affected by factors such as DG penetration rate, network operation status, and unmeasurable load switching. Higher requirements for data synchronization

Method used

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  • Distribution Network Pilot Protection Method and System Based on Positive Sequence Fault Component Energy Direction
  • Distribution Network Pilot Protection Method and System Based on Positive Sequence Fault Component Energy Direction
  • Distribution Network Pilot Protection Method and System Based on Positive Sequence Fault Component Energy Direction

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Experimental program
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Effect test

Embodiment 1

[0066] refer to Figure 14 , this embodiment provides a distribution network longitudinal protection method based on the energy direction of the positive sequence fault component, which specifically includes the following steps:

[0067] Step 1: Obtain the three-phase voltage of the node at the protection installation site and the three-phase current of each feeder in real time, and calculate the instantaneous positive sequence fault components of the node voltage and feeder current at the protection installation site;

[0068] Specifically, the phase voltage sudden change is used as the starting criterion for detecting whether the fault occurs, specifically:

[0069] ||u(t)-u(t-N)|-|u(t-N)-u(t-2N)||>U set

[0070] In the formula, u(t) represents the phase voltage sampling value of the t-th sampling point, N is the number of sampling points in a power frequency cycle, U set is the starting threshold.

[0071] In the specific implementation, the instantaneous positive-seque...

Embodiment 2

[0150] This embodiment provides a distribution network pilot protection system based on the energy direction of the positive sequence fault component, which specifically includes the following modules:

[0151] The instantaneous positive sequence fault component calculation module is used to obtain the three-phase voltage of the node at the protection installation site and the three-phase current of each feeder in real time, and calculate the instantaneous positive sequence fault component of the node voltage and feeder current at the protection installation site;

[0152] Positive-sequence fault component energy value calculation module, which is used to multiply and integrate the instantaneous positive-sequence fault component current and the instantaneous positive-sequence fault voltage with a lag of 90° to obtain the positive-sequence fault component energy value;

[0153] A fault direction identification assignment module, which is used to compare the energy value of the p...

Embodiment 3

[0157] This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the above-described method for pilot protection of a distribution network based on the energy direction of a positive-sequence fault component. step.

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Abstract

The invention belongs to the technical field of relay protection for active distribution networks, and provides a distribution network longitudinal protection method and system based on the energy direction of positive sequence fault components. Among them, the method includes obtaining the three-phase voltage of the node at the protection installation site and the three-phase current of each feeder in real time, and calculating the instantaneous positive sequence fault component of the node voltage at the protection installation site and the feeder current; The instantaneous positive-sequence fault voltage is multiplied and integrated to obtain the energy value of the positive-sequence fault component; compare the energy value of the positive-sequence fault component with the preset energy threshold value, use the energy polarity to judge the fault direction, and assign a value to the fault direction identification; The fault direction identification of the nodes where the protection is installed on both sides of the protected area is used to determine whether an internal fault occurs and whether to send a trip command.

Description

technical field [0001] The invention belongs to the technical field of active distribution network relay protection, and in particular relates to a distribution network longitudinal protection method and system based on the energy direction of positive sequence fault components. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] As more and more distributed power sources (DG) are directly connected to the distribution network, the traditional radial single-ended power distribution network has become an active distribution network with multiple power sources and multiple terminals. Distributed power access poses new challenges to the protection of distribution network feeders. When the active distribution network fails, the DG can provide short-circuit current to the fault point, resulting in changes in the magnitude and phase of the fault cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J13/00
CPCH02H7/26H02J13/0004Y02E60/00Y04S10/20
Inventor 邹贵彬周成瀚高厚磊臧琳冬温旭辉
Owner SHANDONG UNIV