Reliability Analysis And Research Of Distribution System With Distributed Generation

As the last link of power transmission,the distribution network is directly connected to consumers.In addition,as the social development process continues to accelerate,people's quality requirements for electricity continue to increase,and the reliability of power supply directly affects the safe operation of the power grid.Therefore,the reliability of the distribution network becomes extremely important in grid planning.For the gradual consumption of traditional non-renewable energy,in order to protect the environment and sustainable development of energy,distributed power sources are widely used in power distribution networks due to their environmentally friendly,convenient installation,and investment savings.Therefore,research on the reliability technology of distribution networks with distributed power sources is of great significance to the sustainable development of energy.In this paper,the concepts,characteristics,types,access methods,operation methods,and reliability models of distributed generation are explained in detail one by one;the research status of reliability analysis of distribution networks with distributed power sources at home and abroad is detailed.Explanation:It describes from three aspects of components,load and system,and gives the calculation method of its reliability index.Then,based on the analysis of several commonly used reliability evaluation methods,the minimum path method in the analytical method is studied in depth.The minimum path method combined with interval calculation is improved to improve the interval accuracy.Under the uncertainty of the original parameters of the distribution network,the original parameters of the component are intervalized.For the combined interval minimum road method,the interval inversion formula is used.Combined with affine operation,the range of the result range can be effectively reduced.At the same time,the distributed power and load are random.After studying the wind power probability model,a Weibull wind speed distribution model is established.The reliability of the distribution network was studied.Finally,the IEEE RBTS BUS6 F4 feeder is used to conduct a case study,The depth-first search method and the breadth-first search method are used to solve the optimal island.In combination with the island operation mode,6 schemes were adopted to analyze the influence of the wind turbines with different capacities and the distributed power of rated power on the reliability index of the distribution network,Through analysis,the data results show that for the distribution network load point reliability index,the access of distributed power will only affect the island load point reliability index;for the entire distribution network system reliability index,The access of distributed power has an impact on the reliability index of the distribution network system.Reasonable selection and installation of DG can improve the reliability of distribution network system.