A Probabilistic Evaluation Method for Fault-Tolerant Online Fault Location in Distribution Networks

Abstract

The present invention proposes a probability assessment method for fault-tolerant online fault location in distribution networks, the steps of which are as follows: based on the alarm information received by the control master station, quantify the feeder failure probability assessment value; establish the feeder failure probability assessment value as Calculation function of feeder failure probability accumulation characteristic of endogenous variable; based on the deviation between the cumulative expected value of feeder failure probability and the calculation function value of feeder failure probability accumulation characteristic, the switch function set of probability approximation is established; the evaluation value of feeder failure probability is the constraint condition The probability evaluation optimization model is established with the minimum sum of squared deviations of the switching function set approximated by probability as the optimization goal, and the feeder failure probability is calculated; the control master station sends an opening command to the automatic switch next to the possible faulty feeder section according to the feeder failure probability. The invention is based on the uncertainty theory framework, has stronger fault tolerance, can directly obtain the failure probabilities of all possible faulty feeder sections, and has strong numerical stability.

Description

technical field [0001] The present invention relates to the technical field of intelligent distribution network, and in particular to a probability assessment method for fault-tolerant online fault location of distribution network, which is effective in determining the fault probability when there is no alarm information missing or falsely reported in the distribution network feeder fault section. Quantification and fault isolation. Background technique [0002] Practice has shown that as a part of the power system that is directly connected to users, the distribution network has a high failure rate due to its complex environment. A fast and accurate fault location method for the distribution network is the key to improving the automation and intelligence of the distribution network. , which plays an important role in improving the self-healing and reliability of power supply. However, as the available fault location information of the distribution network has strong uncert...

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Problems solved by technology

[0009] Aiming at the technical problem that the distribution network fault location method based on the information collected by the automation terminal has the technical problem that when the adjacent point distortion bit and the non-distortion bit are equal, it is easy to miss and misjudgment, the present invention proposes a distribution network fault-tolerant online fault location method The probability evaluation method, based on automated terminal equipment such as FTU, realizes the effective quantification of the failure probability of the feeder section and the isolation of the feeder fault under the scenario of whether there is alarm information distortion for the feeder fault section of the distribution network, and can effectively realize large-scale complex distribution network. online fault location

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