Low-voltage distribution network cascading failure early warning method based on risk assessment model

Abstract

The invention discloses a low-voltage power distribution network cascading failure early warning method based on a risk assessment model, and the method comprises the steps: data collection and processing: collecting load data, weather data and fault data of a low-voltage power distribution network, and carrying out the data preprocessing of the collected data; fault feature selection: adopting an improved G-ReliefF algorithm to carry out optimal selection of fault features of the low-voltage power distribution network; performing cascading failure search: performing subsequent failure search according to the line outage model and the key line model, generating an accident chain and evaluating the accident chain; and fault early warning: calculating a risk assessment coefficient of the element and the line, determining a fault occurrence probability through the risk assessment coefficient, finally carrying out comprehensive risk assessment on the fault, and calculating a risk level. The method is used for predicting and mastering the safe operation state of the low-voltage power distribution network, discovering potential dangers and judging the fault development trend so as to improve the accuracy of fault early warning and further avoid large-area power failure.

Description

technical field [0001] The invention belongs to the technical field of low-voltage distribution network fault early warning, and relates to a low-voltage distribution network cascading fault early warning method based on a risk assessment model. Background technique [0002] With the rapid development of economy and society, more stringent requirements are put forward for the reliability of power supply of low-voltage distribution network. However, with the large-scale interconnection of the power grid, while improving the reliability and economy of the system, it also makes the dynamic behavior of the power grid more complex. Some faults in the local power grid may also spread to adjacent regional power grids, causing cascading failures, and then leading to power outages. Accidents and even breakdowns in the power grid. Large-scale power outages in low-voltage distribution networks are almost always caused by cascading failures, that is, after the primary failure of the sy...

AI Technical Summary

Problems solved by technology

However, with the large-scale interconnection of the power grid, while improving the reliability and economy of the system, it also makes the dynamic behavior of the power grid more complex. Some faults in the local power grid may also spread to adjacent regional power grids, causing cascading failures, and then leading to power outages. Accidents and even grid breakdowns

Large-scale power outages in low-voltage distribution networks are almost always caused by cascading failures, that is, after the primary failure of the system, the large-scale transfer of the power flow leads to successive failures of other components, the system’s operating status continues to deteriorate, and finally a large-scale blackout occurs

Although the probability of cascading failures is small, the consequences to the system are quite serious

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