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Power 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: 2021-11-16
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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  • Power distribution network pilot protection method and system based on positive sequence fault component energy direction
  • Power distribution network pilot protection method and system based on positive sequence fault component energy direction
  • Power distribution network pilot protection method and system based on positive sequence fault component energy direction

Examples

Experimental program
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Embodiment 1

[0066] refer to Figure 14 , this embodiment provides a distribution network longitudinal protection method based on the energy direction of positive sequence fault components, 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 component of the node voltage at the protection installation site and the feeder current;

[0068] Specifically, the sudden change in phase voltage is used as the starting criterion for detecting whether a 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 tth sampling point, N is the number of sampling points in one power frequency cycle, U set is the start threshold.

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

Embodiment 2

[0150] This embodiment provides a distribution network longitudinal protection system based on the energy direction of positive sequence fault components, 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 at the protection installation site and the feeder current;

[0152] A 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] The fault direction identification assignment module is used to compare the energy value of ...

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, the above-mentioned method for longitudinal protection of a distribution network based on the energy direction of a positive sequence fault component is implemented. step.

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Abstract

The invention belongs to the technical field of active power distribution network relay protection, and provides a power distribution network pilot protection method and system based on a positive sequence fault component energy direction. The method comprises the following steps of: acquiring three-phase voltage of a node at a protection installation position and three-phase current of each feeder line in real time, and calculating instantaneous positive sequence fault components of the node voltage and the feeder line current at the protection installation position; multiplying the instantaneous positive sequence fault component current by an instantaneous positive sequence fault voltage lagged for 90 degrees, and calculating an integral to obtain a positive sequence fault component energy value; comparing the positive sequence fault component energy value with a preset energy threshold value, judging a fault direction by using energy polarity, and assigning a value to a fault direction identifier; and judging whether an internal fault occurs or not and whether a tripping command is to be sent or not through the fault direction identifiers of the nodes at the protection installation positions on the two sides of a protected section.

Description

technical field [0001] The invention belongs to the technical field of relay protection for active distribution networks, 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 generators (DG) are directly connected to the distribution network, the traditional radial distribution network with single-end power supply becomes an active distribution network with multi-source and multi-terminal power supply. Distributed power access poses new challenges to distribution network feeder protection. When a fault occurs in the active distribution network, DG can provide short-circuit current to the fault point, resulting in changes in the amplitude and phase of the ...

Claims

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Application Information

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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