Power system vulnerable line identification method based on weighted H index

Abstract

The invention discloses a power system vulnerable line identification method based on a weighted H index. The method comprises the following specific steps: 1, considering the topological structure characteristics and the operation state characteristics of a power system network and establishing the secondary correlation network of the power system; 2, considering the edge weight and the node strength in the correlation network and improving the classical H index so as to obtain the weighted H index; and 3, the power transmission lines are sorted according to the weighted H index obtained in the step 2 so as to complete the identification of the vulnerable line. The classical H index is improved by considering the correlation network, the calculation range of the index is extended from theinteger field to the real number field and thus the vulnerable line in the system can be identified more accurately. Meanwhile, the weighted H index can be used for the identification of the vulnerable line in the power network and used for the vulnerability analysis of other networks such as the pipeline network, the energy transportation network and the like.

Description

technical field [0001] The invention relates to a vulnerable line identification method in power grid vulnerability analysis, in particular to a method for identifying vulnerable lines in a power system based on a weighted H index. Background technique [0002] In recent years, large power outages have occurred from time to time. Although the frequency of these accidents is not high, each accident will have a catastrophic impact on society without exception. The massive power outage in Brazil in March 2018 caused about a quarter of users to lose power. Due to the overload trip of a bus circuit breaker, the converter station at the sending end lost the AC power supply, resulting in a bipolar outage. Coupled with the unreasonable grid structure of the Brazilian power grid itself, the key AC and DC channels from north to south were affected, eventually triggering chain failures. It can be seen from the accident process that some key lines in the system played a role in fueli...

AI Technical Summary

Problems solved by technology

Due to the overload trip of a bus circuit breaker, the converter station at the sending end loses AC power, resulting in a bipolar outage

Coupled with the unreasonable grid structure of the Brazilian power grid itself, the key AC and DC channels from north to south were affected, which eventually led to cascading failures

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