Comparision of Traditional and Fuzzy Failure Mode and Effects Analysis for Smart Grid Electrical Distribution Systems

Abstract: Reliability Assessment is an indispensable technology for identifying, interpreting, and lessening the potential failures in safety-critical systems like smart grids. Failure modes and effects analysis (FMEA) is one of the well documented techniques for risk analysis to study the impact of failure modes on safety critical systems like smart grid. In traditional FMEA failure modes are prioritized based on a numeric assessment known as risk priority number. Risk priority number (RPN) is defined as the product of three risk factors namely severity (S), occurrence (O), and detection (D). These risk factors are generally attained by extensive team efforts and judgments which can lead to errors and inconsistencies. To address the shortcomings of the traditional FMEA, a fuzzy-based FMEA approach is proposed to generate reliable risk priority rankings. In this study, traditional and fuzzy-based FMEA risk priority rankings for smart grid electrical distribution systems are compared and recommendations are made based on the analysis. Results prove the efficiency of the proposed fuzzy-FMEA method.