Compensation grounding power grid adaptive line selection method using rough set theory for classification

A technology of grounding power grid and line selection method, applied in the direction of fault location, etc., can solve the problems of information redundancy, limited scope of application, limited applicability of single criterion, etc.

Active Publication Date: 2017-10-10
SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER +2
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Problems solved by technology

The scope of application of the single-criterion line selection method is limited. For example, the line selection method based on the steady state quantity is suitable for the fault situation with weak transient information, and the line selection method based on the transient quantity is more accurate for the fault situation with strong transient information.

Method used

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  • Compensation grounding power grid adaptive line selection method using rough set theory for classification
  • Compensation grounding power grid adaptive line selection method using rough set theory for classification
  • Compensation grounding power grid adaptive line selection method using rough set theory for classification

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[0106] The following is a detailed description from the aspects of model establishment, basis principle, and validity verification:

[0107] (1) Model establishment

[0108] as attached figure 2 Shown is the 10kV distribution network model established in ATP-EMTP, and the lines are all overhead lines. Overhead line parameters are: positive sequence resistance R 1 =0.17Ω / km, positive sequence inductance L 1 =1.36×10 -3 H / km, positive sequence capacitance C 1 =6.1×10 -8 F / km; zero sequence resistance R 0 =0.23Ω / km, zero sequence inductance L 0 =3.872×10 -3 H / km, zero sequence capacitance C 0 =2.278×10 -8 F / km; feeder lengths are 10km, 18km, 20km, 16km respectively. The inductance value of the arc suppression coil is set according to the overcompensation of 10%, the obtained inductance value is L=2.13H, the resistance value is set according to 10% of the inductance value, and r=66.9Ω;

[0109] (2) Based on the principle

[0110] The basis for defining the band energ...

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Abstract

The invention discloses a compensation grounding power grid adaptive line selection method using a rough set theory for classification; the method comprises the following steps: using a transient zero sequence current in one cycle after a fault to calculate a transient factor; 2, calculating a post-fault half cycle transient zero sequence current frequency band energy factor; 3, using the rough set theory to fuse the transient factor with the frequency band energy factor, forming decision rules, and dividing single-phase grounding faults into strong, middle and weak types; 4, adaptively selecting a corresponding line selection method according to different fault types. Compared with a single-criteria line selection method, the method is stronger in applicability and higher in accuracy; compared with a multi-criteria fusion line selection method, the method can reduce unnecessary fusions, thus greatly reducing data processing amount, and ensuring the line selection accuracy.

Description

technical field [0001] The invention belongs to the field of fault line selection methods in power system relay protection, and relates to an adaptive line selection method for a compensation grounding power grid, in particular to an adaptive line selection method for a compensation grounding power grid classified by rough set theory. Background technique [0002] In my country's 6~66kV distribution network, the neutral point mainly adopts the non-effective grounding method, that is, the neutral point is not grounded or the neutral point is grounded through the arc suppression coil. With the development of the economy, the capacity of the system continues to increase, and the number of feeder lines continues to increase, resulting in an increase in the ground capacitance current when a single-phase ground fault occurs. In order to curb the ground current, in the distribution network, the neutral point is grounded through the arc suppressing coil, which is more and more popul...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 万新强赖勇韩瑞陈莹戴超凡葛蕾李江成
Owner SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER
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