Vulnerable transmission lines are key points of cascading failures and blackouts. While the vulnerable transmission line identification is challenging due to the complexity of power system. This study puts forward a vulnerable transmission line identification method using the improved structural hole theory (named ISH method) in correlation networks, in which the interactive strengths among transmission lines under N − 1 check are considered. This method converts the vulnerable transmission line identification in power grids into key node evaluation in correlation networks. Since weighted state and structure correlation networks reflect the changes of transmission lines in operation states and topology structures before and after N − 1 check, this method is more accurate than other methods based on static complex grid. Besides, this method is very efficient for only local information is used when calculating the constraint coefficient of each node by means of the ISH theory. Numerical simulations on the IEEE-39 bus system and a regional grid of China verify the validity and accuracy of the ISH method by comparing with other methods.

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Vulnerable transmission line identification using ISH theory in power grids

References

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