Disaster-resistant backbone network frame optimization method considering multi-stage performance

Abstract

The invention discloses a disaster-resistant backbone network frame optimization method considering multi-stage performance. According to the method, node tidal flux, node cohesion degree change rate,node power concentration degree and node electrical betweenness are defined for node importance; connection importance, line vulnerability and line power flow betweenness are defined according to theline importance indexes; a kernel principal component method is adopted, the importance indexes of nodes and lines in the power system are integrated; therefore, the direct nonlinear correlation of multiple indexes is solved and the dimension of the data is reduced. Load power supply is guaranteed when disasters happen; when the net rack is damaged, stable operation of the system is maintained; the multi-stage disaster resistance requirement of high post-disaster recovery speed is met; the backbone network frame is subjected to multi-objective optimization by comprehensively considering a network frame disaster resistance optimization objective based on load loss, a network frame survivability optimization objective based on network natural connectivity and a system restorability optimization objective based on a network frame coverage rate, so that the requirements of each stage of disaster resistance are met, and a calculation result is closer to engineering practice.

Description

technical field [0001] The invention relates to the field of electric power system emergency response, in particular to a disaster-resistant backbone network frame optimization method considering multi-stage performance. Background technique [0002] In recent years, accidents affecting the safe operation of power grids have occurred frequently due to extreme natural disasters. The root cause of the accident is that the existing fortification standards of power facilities cannot resist the increasingly severe natural disasters. Therefore, it is necessary to strengthen the nodes and lines that are important to the operation and structure of the power grid according to the principle of "general improvement and key strengthening", so as to improve the stability of the overall grid structure and reduce the losses caused by disasters to the power system. [0003] The planning principle of the existing backbone grid is based on differentiated planning, and uses a relatively econo...

AI Technical Summary

Problems solved by technology

[0003] The planning principle of the existing backbone grid is based on differentiated planning, and uses a relatively economical method to ensure that relatively important parts of the power grid, including important loads, important power sources, and important lines, can operate safely and stably in disaster weather , failed to consider the coverage effect of the backbone network structure on the entire network and the role of restoring the entire network after a disaster

On the other hand, the important node and line identification method using a single indicator is not comprehensive and has great differences. However, when using multiple indicators and constant weight analysis methods, there are mostly redundant relationships between indicators, resulting in data inconsistencies. reuse

[0004] It can be seen that there is still room for improvement in the existing backbone grid planning

Images