Research Of Distributed Generation Planning In Active Distribution Network

Optimization of structure of energy sources,implement policies of energy conservation,these will make a high-permeability of distributed generation in active distribution network.A large amount of DG capacity connected to distribution network will bring about the great influence on operation and planning of conventional distribution network.The features of DG unstable output characteristics,traditional passive distribution network need to be transferred to active distribution network.Scientific and rational distribution network planning,active management model is fully considered to control the operation of distribution network.So it is significant for us to research about the optimal allocation problem of DG in ADN.On the basis of traditional distribution network,characteristics and key technology of ADN are detailed.Then analyzes the influence of distributed generation brought to the ADN from the aspects of planning,operation and protection,introduces few applied extensively active management measures.It took into account the randomness of intermittent generation,such as wind turbine generation and photovoltaic power generation,as well as the uncertainty of loads,the K-means clustering method is adopted to reduce the quantity of scenarios.Then consider about the time series characteristics of load and DG,a two-layer model was proposed,the upper level planning objective of which was to minimize annual synthesis costs,while the lower level planning of which was to minimize synthesis costs of each scene.The adaptive genetic algorithm and prime-dual interior point method are used to solve the optimization problem.Finally,the IEEE33 ADN system was selected for example,to verify the feasibility of the model and the effectiveness of the algorithm.The Matlab simulation results show that the two-layer model which established in this paper is feasibility,and the improved algorithm is effectiveness.