Reliability Evaluation of Smart Substation Based on Time-Varying Probabilistic Hybrid Attack Graph

Zhiyong Li, Wubin Wen, Rende Dai and Wanting Xi
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Zhiyong Li: School of Automation, Central South University, Changsha 410083, China
Wubin Wen: School of Automation, Central South University, Changsha 410083, China
Rende Dai: Hunan Zhongda Design Institute Co., Ltd., Changsha 410205, China
Wanting Xi: School of Automation, Central South University, Changsha 410083, China

Energies, 2022, vol. 15, issue 18, 1-15

Abstract: A substation is the portion of a power grid that forms a link between the cyber system and the physical system. Reliability evaluation of smart substations based on a time-varying probabilistic hybrid attack graph (TVPHAG) is studied in this paper. First, the topology network of the smart substation is established, whose attributes are represented by probability. Then, in order to solve the problem of asynchrony in the cyber-physical system and the hybrid caused by heterogeneity, time-varying state equation in topology and cuts in algebra are introduced to TVPHAG. Based on TVPHAG, the evaluation of the reliability of cyber-physical systems with multiple equipment and multiple timescales is established. On this basis, the influences of physical conditions, cyberattacks, physical attacks, and cyber-physical attacks on substations are analyzed, respectively. Finally, the simulation shows that the method is effective in evaluating the reliability of smart substations, providing a new method for the evaluation of reliability.

Keywords: reliability evaluation; TVHPAG; smart substation; cyber-physical attack (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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