FUZZY SYNTHETIC EVALUATION OF POWER QUALITY BASED ON CHANGEABLE WEIGHT

The quantified description from power quality synthetic evaluation is available for reference to the consumers in choosing the power suppliers, and it is also beneficial to fix the price according to the quality of electric energy. Combining the analytic hierarchy process (AHP) with fuzzy theory, at first the subjective weights are obtained, then by means of modifying the obtained subjective weights the changeable synthetic weights are formed, at last power quality at the point of common coupling(PCC) is evaluated by fuzzy synthetic evaluation and the power quality level and the power quality factor are obtained. Case results show that the proposed method is beneficial to distinguish power quality level and to conduct the quantitative and qualitative evaluation of power quality.