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Energies 2017, 10(1), 87; doi:10.3390/en10010087

Modeling and Vulnerability Analysis of Cyber-Physical Power Systems Considering Network Topology and Power Flow Properties

1
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
2
State Grid Zhejiang Electric Power Company, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Academic Editors: Mashrur (Ronnie) Chowdhury and Kakan Dey
Received: 30 September 2016 / Revised: 10 December 2016 / Accepted: 5 January 2017 / Published: 12 January 2017
View Full-Text   |   Download PDF [3499 KB, uploaded 12 January 2017]   |  

Abstract

Conventional power systems are developing into cyber-physical power systems (CPPS) with wide applications of communication, computer and control technologies. However, multiple practical cases show that the failure of cyber layers is a major factor leading to blackouts. Therefore, it is necessary to discuss the cascading failure process considering cyber layer failures and analyze the vulnerability of CPPS. In this paper, a CPPS model, which consists of cyber layer, physical layer and cyber-physical interface, is presented using complex network theory. Considering power flow properties, the impacts of cyber node failures on the cascading failure propagation process are studied. Moreover, two vulnerability indices are established from the perspective of both network structure and power flow properties. A vulnerability analysis method is proposed, and the CPPS performance before and after cascading failures is analyzed by the proposed method to calculate vulnerability indices. In the case study, three typical scenarios are analyzed to illustrate the method, and vulnerabilities under different interface strategies and attack strategies are compared. Two thresholds are proposed to value the CPPS vulnerability roughly. The results show that CPPS is more vulnerable under malicious attacks and cyber nodes with high indices are vulnerable points which should be reinforced. View Full-Text
Keywords: vulnerability analysis; cyber-physical power system (CPPS); cascading failure; complex network theory; interdependence vulnerability analysis; cyber-physical power system (CPPS); cascading failure; complex network theory; interdependence
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Guo, J.; Han, Y.; Guo, C.; Lou, F.; Wang, Y. Modeling and Vulnerability Analysis of Cyber-Physical Power Systems Considering Network Topology and Power Flow Properties. Energies 2017, 10, 87.

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