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DG feed line-containing current sequence component comparison mode fault section positioning method

A technology of current sequence component and fault section, applied in fault location, measurement of electrical variables, detection of faults by conductor type, etc., can solve problems such as failure, and achieve the effect of fast action, simple principle and high sensitivity

Inactive Publication Date: 2018-08-24
STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY +2
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Problems solved by technology

But when the distributed power penetration rate is high, the scheme will fail
[0011] It can be seen that there is no fault location scheme that is not affected by factors such as fault ride-through current and DG penetration rate among the existing fault location schemes for distribution networks containing DG

Method used

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  • DG feed line-containing current sequence component comparison mode fault section positioning method
  • DG feed line-containing current sequence component comparison mode fault section positioning method
  • DG feed line-containing current sequence component comparison mode fault section positioning method

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with accompanying drawing.

[0049] The present invention discloses a current sequence component comparison type fault section location method including DG feeder, as shown in Figure 1, including the following steps:

[0050] (1) Collect the current flowing through the switches on both sides of the feeder in real time;

[0051] (2) After detecting a fault in the feeder, use the symmetrical component method to calculate the positive and negative sequence current components of the fault current for subsequent steps;

[0052] (3) Judging the symmetrical or asymmetrical fault according to the magnitude difference between the positive and negative sequence currents calculated in (2);

[0053] (4) When it is determined in step (3) that the fault is an asymmetrical fault, the negative sequence current phase comparison method is introduced to calculate the negative sequence current phase difference at both en...

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Abstract

The invention discloses a DG feed line-containing current sequence component comparison mode fault section positioning method comprising the following steps: gathering a current passing switches on two sides of a feed line in real time; detecting the feed line to have a fault, and calculating positive and negative sequence current components of the fault current; using an amplitude relation of thepositive and negative sequence current components to determine a fault type; determining the fault type as an asymmetry fault, comparing the negative sequence current phases on two ends of the feed line, and determining whether the section is the fault section or not according to the phase difference; determining the fault type as a symmetry fault, comparing the amplitudes of the positive sequence current on two ends of the feed line, and determining the fault section according to the ratio relation of said two. According to simulation, analysis and dynamic model tests, when different positions of the DG feed line have different types of faults, the method can correctly identify the fault sections with a high sensitivity and strong reliability; in addition, the method cannot be affected by DG types and capacities, transition resistance and crossing current factors.

Description

technical field [0001] The invention relates to the technical field of fault location, in particular to a current sequence component comparison type fault section location method containing a DG feeder. Background technique [0002] The depletion of global fossil energy and the enhancement of environmental awareness in various countries have promoted energy transformation, and with the development of smart grid, more and more distributed generation (DG) is connected to the distribution network. The access of DG has changed the grid structure of the traditional distribution network, changing it from a traditional single-end power supply radial network to a double-end or multi-terminal power supply network; in addition, the output of DG is uncertain, and its output is affected by its own The control strategy has much less impact than the system mains power. These characteristics make the traditional distribution network protection strategies and positioning schemes malfunctio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H7/26H02J3/46
CPCG01R31/085G01R31/088H02H7/262H02J3/46Y04S10/52
Inventor 邹贵彬杨晶晶李颖超王健王娟娟
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY
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