Study on the supply capability assessment of distribution network connected large-scale renewable energy

Abstract

There is no power source in traditional distribution network, the power flow of which is unidirectional. However, the distribution network connected renewable energy power generation is multi-directional, and the complex “multi-source” is an important feature of which. Then the protection configuration is more complex, the power quality is reduced, and the supply security is declined. Considering the new demands on distribution network generally connected large-scale renewable energy power generation, the study on the supply capability assessment technology of distribution network need to carry out, and the shortcomings of traditional supply capability assessment methods need to be improved. The paper study the supply capability assessment of distribution network connected large-scale renewable energy power generation. Considering the uncertainties of renewable energy power generation prediction and the errors of load prediction, the main influencing factors of supply capability of distribution network are given through sensitivity analysis. The power grid operation constraints and physical constraints of supply capability of distribution network are analysed emphatically. For achieving the available supply capability assessment of distribution network, the function is established whose goal is maximum supply capability. At last, a regional distribution network system is provided to verify the accuracy and effectiveness of the proposed method in the paper.