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Fuzzy theory based power distribution network multi-criteria integrated fault line selection method

A technology of fault line selection and fuzzy theory, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc.

Inactive Publication Date: 2016-08-31
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to propose a fuzzy theory-based multi-criteria fusion fault line selection method for distribution networks, which helps to better solve the shortcomings of the single line selection method and make it have a wider range of faults. Applicability and higher accuracy

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  • Fuzzy theory based power distribution network multi-criteria integrated fault line selection method

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] Such as Figure 1 to Figure 5 As shown, this embodiment provides a fuzzy theory-based multi-criteria fusion fault line selection method for distribution networks, including the following steps:

[0057] Step S1: Establish a radial cable-line hybrid distribution network model with n outgoing lines;

[0058] Step S2: Obtain the zero-sequence voltage of the busbar and the zero-sequence current at the head end of each outgoing line;

[0059] Step S3: Determine whether a permanent single-phase ground fault occurs in the system, if not, return to step S2; if yes, enter step S4; among them, if the system generates zero-sequence voltage and zero-sequence current, it is judged that a permanent single-phase fault occurs in the system Ground fault, if the system does not generate zero-sequence voltage and zero-sequence current, it is judged that there is ...

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Abstract

The invention relates to a fuzzy theory based power distribution network multi-criteria integrated fault line selection method which utilizes a fuzzy theory to intelligently integrate highly complementary methods of a high frequency modal energy based fault line selection method and a fifth time harmonic wave component based fault line selection method to achieve multi-criteria integrated fault line selection based on a fuzzy theory. The method is suitable for fault line selections in difficult line selection areas such as small angle earth faults, high resistance earth faults, line end faults, and arc earth faults with high accuracy and reliability.

Description

technical field [0001] The invention relates to the field of small current single-phase grounding faults, in particular to a fuzzy theory-based multi-criteria fusion fault line selection method for distribution networks. Background technique [0002] In the distribution network, single-phase ground fault (Single Line to Ground Fault, SLG) accounts for about 80% of the total faults, and has the highest probability of occurrence. Since the voltage between the phases of the system still maintains the original symmetry after the SLG occurs, the power supply of the system to the load will not be hindered in a short time after the fault, so the relay protection device does not need to cut off the fault immediately, and the regulations stipulate that the system can work with the fault for 1-2h . However, if the system runs with a fault for a long time, it will damage the insulation, expand the fault range, and cause extremely serious economic losses. Therefore, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 金涛阮玉斌柳瑾褚福亮
Owner FUZHOU UNIV
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