Power quality assessment considering characteristics of distributed generation system

The emission intensity of CO2is quantified and taken into the comprehensive power quality assessment indices to ensure the competitive ability and enlargement initiative of distributed generation system in power market. An assessment method based on set pair principle is proposed,which introduces the connection degree and adopts the membership functions to describe the uncertainty between the power quality indices and the state levels from three perspectives:identical,discrepant and contrary. The hierarchical analysis method is applied to determine the weight coefficients and the confidence criteria and scoring criteria are combined to identify the superiority-inferiority attribute of ordered power quality partitions for different state levels and every quality level. Case study shows that,the proposed assessment method improves the rationality and delicacy of assessment results significantly.