Comprehensive assessment of voltage sag considering reliability and economy

The reliability of electricity supply is required by users increasingly, and whether to invest the reliability and voltage quality has been a point of contention. Thus, the assessment of voltage sag becomes acute. In this paper, the acceptable indices considering system performance and user characteristics are proposed for comprehensive assessment of voltage sag, including the reliability of the system and economy of users. The comprehensive assessment strategy, based on analytic hierarchy process (AHP), is applied to the assessment process for integrate the independent variables of the indices function. All the factors of users can be collected accurately from historic data, and the effectiveness of the method proposed in this paper is proved by the analysis of IEEE RBTS system.