Constructing the Bayesian Network for components reliability importance ranking in composite power systems

► A simple approach is presented to construct the Bayesian Network (BN) of a power system. ► The approach is based on the capability of the BN to learn from data. ► The approach can be applied to large power systems. ► Different probabilistic assessments are easily provided by the constructed BN. ► The importance of each component on system reliability can be easily evaluated. In this paper, Bayesian Network (BN) is used for reliability assessment of composite power systems with emphasis on the importance of system components. A simple approach is presented to construct the BN associated with a given power system. The approach is based on the capability of the BN to learn from data which makes it possible to be applied to large power systems. The required training data is provided by state sampling using the Monte Carlo simulation. The constructed BN is then used to perform different probabilistic assessments such as ranking the criticality and importance of system components from reliability perspective. The BN is also used to compute the frequency and duration-based indices without time sequential simulation based inferences. The proposed approach provides the possibility of assessing the components importance in view of different load points. The validity and efficiency of the proposed approach is verified by application to the IEEE-Reliability Test System (RTS).