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| Secure Region of Network and Comparison with Invulnerability |
| XIAO Jun1, SU Buyun2, LI Xin3, WANG Chengshan1
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1. Key Laboratory of Smart Grid of Ministry of Education, Tianjin University,Tianjin 300072,China;
2. Guangdong Electric Power Design Institute, CEEC, Gungzhou 510663,China;
3. Sichuan Electric Power Research Institute, Chengdu 610072, China |
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Abstract This paper presents a new method for security analysis and precautionary measures when attack or error occurs in networks. This method describes the operating region under N-1 constraint and presents the degree of security or insecurity by secure distance to indicate direction and intensity for next step. We put the method into effect in general networks, small communication network and large-scale power network to verify its correctness, and compare it with network invulnerability. It can be seen that secure distance index and invulnerability index are very consistent in judging the reliability of a system, meanwhile, the former can bring secure region information to eliminate hidden dangers in advance and be appropriate for online security surveillance and control based on faster calculation speed.
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Received: 28 June 2015
Published: 25 February 2025
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