Power Quality Comprehensive Evaluation Of Power System

Power quality level is affected by many factors in the power system, particularly the micro-grid as well as various non-linear impact load increased pollution on the power system. Individual power quality indicators can not reflect the overall level of power quality, the number of individual power quality indicators to assess a comprehensive assessment to quantify the value, build a power quality comprehensive evaluation model has important research value.Aiming power quality comprehensive assessment in the power system of the relevant issues have been studied, based on a comprehensive analysis of existing power quality comprehensive evaluation method, combining the needs and characteristics of comprehensive assessment, in-depth study of unascertained measure theory, which is introduced into the field of power quality comprehensive assessment system of power systems, establishing a power quality evaluation system. Combining delphi and triangular fuzzy number method computes subjective weight, calculated objective weights using entropy method, combining subjective and objective weights to compute comprehensive weight by using the addition principle, both to meet the actual needs of the electricity user, but also to comply with the power quality indicators; build power quality comprehensive evaluation of unascertained measure theory, provide assessment procedures and methods, aiming the differents between efficiency and cost type index build its straight unascertained measure function based on unascertained measure theory, calculate individual indicators unascertained measure value, combined with comprehensive weight to determine a comprehensive measure of value, it is determined power quality grades to be evaluated point based on credible identification.Finally, by using the power quality comprehensive evaluation method of pape presents a comprehensive assessment, to give it power quality evaluation level, through simulation examples demonstrate the feasibility and effectiveness of this paper.