Research On Comprehensive Evaluation Of DG Grid-connection

The influences associated with wide range of Distributed Generation(DG)connected to grid are complicated,in order to guiding DG connected projects and grid planning,research to comprehensive evaluation is necessary for overall influences.Firstly,for the overall evaluation of DG characteristics,two types of indices and their membership function models,characteristics of DG grid-connection and accommodation capability to accept DG are established.Characteristic indices of DG grid-connection include power fluctuate,disperse degree and test contribution degree of wiring or main transformer,they can evaluate DG’s quality,layout and modality;The indices of grid accommodation capacity include effective permeability and power balance contribution degree,they can evaluate DG’s scale and peak regulation effect.Summarize the previous work in technical,economy and reliability indices.The idea of specialist marking method is used to improve the normalization method of “membership function model and marking form”.A comprehensive evaluation indices system of DG grid-connection is established based on AHP,combined with objective function,a scientific comprehensive evaluation system can be created.Subsequently,this paper introduces the features of Hubei province distributed energy,selecting the representative Suizhou of Hubei province as an example to carry out the comprehensive evaluation of DG’s influences.The previous constructed comprehensive evaluation system in second chapter is applied in Suizhou grid.The application in Suizhou grid shows that these indices are suitable for evaluation DG characteristics and Suizhou grid’s opration,and verify scientificity of the indices and membership function models.At last,for the process and efficiency of comprehensive evaluation,on the basis of above discussion,the software is realized with Python implementation language.Suizhou grid is used as an example to prove the program correctness.