Abstract
This paper proposes a novel approach to analyze the impacts of cyber layer failures (i.e., protection failures and monitoring failures) on the reliability evaluation of composite power systems. The reliability and availability of the cyber layer and its protection and monitoring functions with various topologies are derived based on a reliability block diagram method. The availability of the physical layer components are modified via a multi-state Markov chain model, in which the component protection and monitoring strategies, as well as the cyber layer topology, are simultaneously considered. Reliability indices of composite power systems are calculated through non-sequential Monte-Carlo simulation. Case studies demonstrate that operational reliability downgrades in cyber layer function failure situations. Moreover, protection function failures have more significant impact on the downgraded reliability than monitoring function failures do, and the reliability indices are especially sensitive to the change of the cyber layer function availability in the range from 0.95 to 1.
Highlights
With the latest developments in communication and embedded computing, traditional power grids are integrated with networked embedded computing and communication systems, offering the chance to improve the power grid reliability, efficiency and operation resilience [1]
The reliability of the cyber layer and its functions with various topologies are calculated with the Reliability Block Diagram (RBD) method, and the impacts from the cyber layer function failures on the availability of the physical layer components are modeled via the multi-state Markov chain model
This paper proposes a novel approach to analyze the impacts of the cyber layer function failures on the reliability of composite power systems in the background of the Cyber-Physical Energy System (CPES)
Summary
With the latest developments in communication and embedded computing, traditional power grids are integrated with networked embedded computing and communication systems, offering the chance to improve the power grid reliability, efficiency and operation resilience [1]. This paper presents an approach to incorporate the failures of cyber layer functions into reliability evaluations of composite power systems. The reliability of the cyber layer and its functions with various topologies are calculated with the Reliability Block Diagram (RBD) method, and the impacts from the cyber layer function failures on the availability of the physical layer components are modeled via the multi-state Markov chain model. The multi-state Markov chain model of electrical components is built, considering the topology of the cyber layer and the reliability of the cyber layer functions, as well as physical components’.
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