Research On Reliability Evaluation Method Of Distribution Network With Distributed Power Generation

The distribution network is an important part of the power system that is directly connected to the users,so whether the distribution network can operate stably is a very worthy concern.With the maturity of new energy generation grid-connected technology,distribution generation represented by photovoltaic installed capacity and wind power installed capacity has become increasingly widely used in power system.On the one hand,when faults happens in the distribution network system,the distribution generation can supply power to the load,thereby improving the security of the distribution network.On the other hand,due to the intermittence of the distribution generation,the uncertainties are added to the system.However,the demand of power users for power quality is getting higher.To solve the above problems,the main work done in this paper is as follows:(1)Firstly,some theories of reliability evaluation of dist ribution network are introduced,including evaluation index system,basic evaluation method,state model of components,etc.In the reliability evaluation index system,on the b asis of the traditional reliability evaluation index system,the power consumpt ion reliability index is added to make the index system closer to the user,and the power consumption reliability index can be compared with the power supply reliability index to reflect the power consumption of the user.experience.(2)Secondly,the reliability assessment of the distribution network is carried out by an assessment algorithm that combines the numbering method and the Monte Carlo simulation method.Firstly,the topology structure of the distribution network is simplified,and the components of the distribution network are numbered,and then combined with the Monte Carlo simulation method,the reliability of the distribution network is evaluated,which makes the evaluation and analysis process more direct and efficient.(3)Finally,a reliability assessment strategy for distribution network with distributed power generation is proposed.The strategy firstly establishes the load model,considers the load time change and the number of switch operation after the fault occurs,then makes the load transfer strategy.Secondly,Secondly,the access mode and operation mode of distributed power supply are determined,and the reliability model of distributed power supply is built.Finally,The reliability evaluation method of distribution network with distributed power supply is studied,and the improved IEEE RBTS BUS6 system is used to verify the effectiveness of the method.The influence of the distribution power supply on the reliability index of the distribution power network is solved and analyzed.