Difference self-healing control method based on device failure probability and power grid operation risks

Abstract

The invention discloses a difference self-healing control method based on device failure probability and power grid operation risks. The difference self-healing control method includes the steps: 1 acquiring operation data and weather data, and calculating comprehensive failure probability corresponding to power distribution network devices; 2 determining risk threshold values; 3 judging whether the comprehensive failure probability exceeds the risk threshold values corresponding to the power distribution network devices or not, optimizing power grid operation modes based on first multi-objective functions if the comprehensive failure probability exceeds the risk threshold values corresponding to the power distribution network devices, optimizing the power grid operation modes based on second multi-objective functions if not, and setting priorities of the power grid operation modes; 4 forecasting loads of power grids next moment based on a multi-classification regression tree algorithm, and calculating comprehensive stoppage probability and comprehensive risk probability of devices in the next moment; 5 determining whether optimization measures are executed or not. According to the method, the device failure probability and the power grid operation risks are fully considered, economical and reliable operation of the power grids is achieved by difference self-healing control without rejecting loads as far as possible.

Description

technical field [0001] The invention relates to the field of distribution network self-healing control, in particular to a differential self-healing control method based on equipment failure probability and power grid operation risk. Background technique [0002] With the rapid development of the smart grid, a large number of uncertain connections of distributed power sources, the structure of the distribution network is becoming more and more complex, the assessment and prediction of the operation risk of the distribution network, and the rapid diagnosis and recovery of faults are becoming more and more difficult. In recent years, scholars at home and abroad have proposed a series of self-healing control methods from different perspectives. Although some progress and results have been made in this research, there are still deficiencies. [0003] The traditional power grid operation risk assessment uses the product of probability and failure consequences. Although it conside...

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Problems solved by technology

[0003] The traditional power grid operation risk assessment uses the product of probability and failure consequences. Although it considers the failures with small probability of occurrence and serious consequences, it ignores the failures with high probability of occurrence but not serious consequences. In comparison, Such failures are more likely to occur, so the risk assessment of grid operation based on this method is not satisfactory

At present, the goal of grid self-healing is mainly to improve the reliability of grid operation, and does not fully consider the relationship between economic operation and reliability of the grid, and the resulting optimization scheme often fails to take into account both economy and reliability.

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