The Research On Allocation Of Fixed Costs In Distribution Networks With Distributed Generation

Distributed generation (DG) technology is a new developing technology and will become one of the directions of electricity industrial development in the 21st century. Cooperating with big power grid, it can greatly improve power supply reliability and maintain important user's power supply under the situation of collapse of power grid and unexpected calamity (such as snowstorms, artificial destruction, war, etc.).Besides, it can eliminate the worry about the electromagnetism produced in the power transmission lines. It develops with the development of renewable energy technology and is being paid attention to with enhancement of electric environmental consciousness. The development of DG forms enormous influence on the traditional power system, and will bring the remarkable progress of the power technology. The power market reform offers opportunity to the development of DG. Meanwhile the access of a large amount of distributed power will bring new challenge to the electric market theory, one of which is the impact on existing distribution network electricity pricing and the allocation of fixed costs.The concept and characteristic of DG is introduced and some concerned technologies in this field are described in brief. The impact on power system of DG is explained and the effect on the electricity market is especially analyzed. Then the various methods for the allocation of fixed costs are systematically introduced, and their pluses and minuses are analyzed. Considering the influence on distribution network after the DG join in it, a method used for the allocation of fixed costs based on contribution factor theory and power flow tracing method and used in distribution network including DG is produced. Then the result to distribution network not including DG is fast gained by using the security analysis"N-1"thought. Some useful conclusions are gained by analyzing the change that the access of DG brings to the allocation of fixed costs. A simple small-scale distribution system including DG is used in the paper and the solved result proved the method valid and feasible.