Power System Reliability Analysis With Intrusion Tolerance in SCADA Systems

By intruding on the substations and control center of the supervisory control and data acquisition system, trip commands can be sent to intelligent electronic devices that control the power system breakers. Reliability of the power system can be impacted through the cyberattacks. In this paper, a mo...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2016-03, Vol.7 (2), p.669-683
Main Authors: Zhang, Yichi, Wang, Lingfeng, Xiang, Yingmeng
Format: Article
Language:English
Subjects:
Computer crime
Control systems
Cybersecurity
Electric utilities
Intrusion
loss of load probability (LOLP)
Markov analysis
Markov processes
Mathematical models
mean time to compromise (MTTC)
Penetration
Power system reliability
SCADA systems
semi-Markov processes (SMPs)
Servers
Simulation
Substations
Supervisory control and data acquisition
supervisory control and data acquisition (SCADA) system
Tolerances
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Description
Summary:By intruding on the substations and control center of the supervisory control and data acquisition system, trip commands can be sent to intelligent electronic devices that control the power system breakers. Reliability of the power system can be impacted through the cyberattacks. In this paper, a modified semi-Markov process (SMP) model is used to describe the procedures of normal and penetration attacks against the intrusion tolerant system. By modeling the transition probabilities between the SMP states and sojourn time of each SMP state, the mean times to compromise the normal and penetration attacks are calculated. With increased probabilities of breaker trips resulted from the cyberattacks, the loss of load probabilities are evaluated based on IEEE reliability test system 79. When the level of attack increases or the level of defense in the system decreases, the simulation results demonstrate that the power system becomes less reliable.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2015.2439693