Research On The Optimal Allocation Of Distributed Generation In Distribution Network

With the continuous development of China's new energy industry,distributed generation(DG)is gradually applied in the power system,and becomes a new type of power supply unit.Therefore,it has become an important topic in the distribution network planning to make a reasonable and effective site selection and capcatiy deterimination for the access of DG in distribution network.The design of closed-loop structure and openloop operation is usually adopted in the traditional distribution network planning.The access of DG will change the power flow and voltage distribution of distribution network,whose position and capacity have a close relationship with the system network loss and node voltage.So the access location and capacity of DG is considered and collaboratively planned in this paper.In addition,the reactive power configuration of distribution network containing DG is correspondingly planned,and the operational level of the distribution network is further enhanced.In this paper,various types of DG is firstly introduced and the impact of the gridintegration of DG is analysed,the mechanism of reactive power compensation and the significance of the grid-integration of DG is pointed out.Secondly,the mathematical model of distributed power locating and sizing is established,a mathematical model based on the network loss and economic cost is proposed,the three scenarios are analyzed by using the improved multi-objective particle swarm optimization algorithm,and the installation capacity and location of DG in different scenarios are obtained.Lastly,the problem of reactive power plant configuration of distribution network with DG is discussed,the voltage stability index of LCPI is proposed,and a reactive power configuration model based on LCPI and network loss is established.In the solution process,the voltage distribution of various optimization results is analyzed and compared,the optimal installation position and capacity of DG,especially the optimal installation position reactive power compensation device under special position are obtained.