Power distribution network looped network single-phase earth fault section positioning and distance measuring method

Abstract

The invention relates to a power distribution network looped network single-phase earth fault section positioning and distance measuring method that is characterized by comprising the following steps: step 1, extracting phase current data measured by each detection device in a power distribution network looped network line in real time, judging an accurate fault occurrence moment based on the phase current data, and calculating comprehensive positive and negative sequence current of a fault component; step 2, establishing a network structure description matrix based on the line construction and the position of each detection device in the line; step 3, calculating a fault interval in the power distribution network line based on the phase characteristics of the comprehensive positive and negative sequence current of the fault component at each detection device and the network structure description matrix; and step 4, based on the fault line type, the fault interval type and the comprehensive positive and negative sequence current of the head end of the looped network, realizing fault point distance measurement calculation and fault point positioning. The method provided by the invention has the advantages of simple steps, simple calculation and high accuracy, reduces the dependence on a communication environment, can meet the requirement of fault positioning in various different line types, and has high engineering realizability.

Description

technical field [0001] The invention relates to the field of electric power automation, and more specifically, to a method for locating and ranging a single-phase ground fault section of a distribution network ring network. Background technique [0002] At present, with the continuous development of the economy and society, the ring network operation mode of the distribution network with higher power supply reliability is gradually applied to the modern distribution network. However, due to the difference between the topology of the ring network and the topology of the radial network, the fault characteristics of the single-phase ground fault in the ring network are different from those of the single-point ground fault in the radial network. The adaptability of localization algorithms for radial distribution network faults has been greatly challenged. In order to ensure the power quality of users under the ring network operation mode and reduce the burden of manual line ins...

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Problems solved by technology

[0010] However, at present, most of the research on fault location using impedance analysis method is applied to radial network, and the research on fault location of ring network structure is relatively lacking.

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