Reliability modeling of partially repairable systems applied on electrical power system

摘要

Partially repairable systems have components with repairable and non-repairable failure modes, which is typical of mission-oriented or safety systems, where incomplete repairs for the operation scenario could take place. Analytical and numerical solutions for reliability modeling of partially repairable systems are proposed in this work. The proposed modeling, based on Markov chains, includes stand-by redundancy and a repair rate factor. Reasons for limited repair capacity are discussed. The modeling is applied to reliability analysis of an electrical power system typical of Nuclear Power Plants, considered to be composed of offsite power lines and redundant Diesel-generators aiming at analyzing an electrical power outage (blackout). A sensitivity analysis of reparability rate impact on availability and reliability is performed, demonstrating the gain resulting from the repair capacity increase.