Comprehensive Evaluation of Two-side Voltage Sag based on Local State Variable Weight and Complex Correlation Coefficient Method

Abstract

Abstract The severity assessment of voltage sag is one of the important basis to measure power quality.At present, voltage sag assessment is mostly based on system or load, lacking of unity on both sides.The evaluation indexes of the voltage sag on the side of the system are divided into the first level and the second level.The load-side evaluation adopts the equipment failure rate based on the comprehensive tolerance curve of sensitive equipment, and the failure probability model is based on the energy function.The complex correlation coefficient method is used to synthesize the indexes of system side and load side to avoid the excessive evaluation caused by the repetition of information in the evaluation.At last, an example analysis is carried out on the proposed method based on the measured data, which verifies the correctness and superiority of the method.