Distribution System Reliability Assessment Considering Cyber-Physical Integration

Abstract

Development of smart grid has progressively transformed traditional power system into a Cyber-Physical Power System (CPPS), however relying on the Information and Communication Technologies (ICTs) may bring more serious Cyber-induced Dependent Failures (CDFs) as well. This paper focuses on developing a comprehensive model to evaluate the impacts of Cyber-Physical Integration (CPI) on distribution system reliability. The vulnerability to CPI from distribution feeders and upstream substation are incorporated in sequential Monte Carlo simulations (MCS) along with several main wiring forms of substation are investigated to decrease the impact of CDF. CDF with various modes are evaluated in terms of the fault scope and impacts on reliability indices. The scope of CDF is considered by defining a cyber-state set, while their impacts on reliability indices are calculated by zone partitioning and the minimal path method. Conclusions were drawn and verified by the IEC 61850-based test system, including the modified Roy Billinton Test System (RBTS) with upstream substation. This work provided help reference for smart distribution system planning and the CPPS research as well.