Research And Application Of Distribution Network Reliability Considering Distributed Generation

Currently,Distributed generation technology is developing rapidly all over the world,and Playing an increasingly important role in the power system.Distributed generation(DG for short)can improve the efficiency of resource utilization,and it is of great significance to alleviate the peak and valley load of power grid operation.From the perspective of national low-carbon development strategy and mitigation of environmental pollution,DG grid connected development is the inevitable choice of power grid.When DG is connected to the distribution network,the structural parameters of the power grid change.The traditional distribution network changes from a single radial power supply to a multi-source power supply.When the power grid fails,all the original lines are cut off because of the existence of DG,which forms an island.Therefore,the reliability evaluation model of the traditional distribution network is not suitable for the situation with DG.Therefore,the reliability evaluation model of distribution network also needs to change according to the access of DG.1.In this paper,a reliability evaluation method of distribution network with DG is proposed.The reliability models are built for intermittent and non intermittent DG respectively.Then,combined with the traditional reliability evaluation theory of power grid,the time series Monte Carlo method is used to simulate the operation of new power grid with DG,and the impact of DG on distribution network reliability is evaluated according to point load and system reliability index.2.In this paper,the main factors that influence the reliability of DG are also explored.It is found that the main factors that influence the reliability of DG are access location and access capacity.Therefore,in this paper,the optimal location model and the optimal constant volume model of DG are proposed,in which the solution of DG constant volume model uses the method of artificial intelligence-artificial bee colony calculation.3.Through the simulation of IEEE-RBTS bus6 distribution network reliability test system,the reliability indexes under different schemes are calculated,and then the different effects of DG access capacity and location on the system reliability are analyzed and compared.Then the optimal location of distribution network connected to DG is determined by constructing a comprehensive index function of minimizing location selection.Finally,an example is carried out to verify the application.