Comprehensive Evaluation of Impacts of High Penetration Distributed Generation Integration in Distribution Network

As an effective supplement to centralized renewable sources, distributed generation (DG) will be greatly developed in the future in China. The DG penetration rate is becoming higher and higher in power system distribution network in recent years. With the high proportion of DG, the power quality, protection and control of the distribution network will be affected. The impacts of DG from five aspects, such as power supply reliability, harmonic level, line loss rate, voltage qualification rate and short circuit current level are mainly studied in this paper. To quantitatively evaluate the impacts, an index system of the impacts of high penetrative DG is adopted, and the quantitative model and calculation method of each evaluation index are proposed. Furthermore, a comprehensive assessment model based on the combination of analytic hierarchy process (AHP) and entropy method is established in this paper to determine the weights of indices. Considering different penetration rates of DGs, the comprehensive evaluation model is calculated based on a test distribution system. The results are presented and analyzed to illustrate the usefulness of proposed model.