| In recent years,with the continuous development of economy and society,the demand for electric energy from all walks of life is increasing,and the requirements for power quality and power supply reliability are getting higher and higher.Due to the continuous expansion of the power grid scale,the power grid system is also constantly upgraded,so the network topology of the power grid is becoming more and more complex.At the same time,the continuous access of large-scale distributed power supply brings a lot of unpredictable effects to the distribution network,which greatly increases the possibility of fault in the distribution network,and then increases the difficulty of fast and accurate fault location of the distribution network.Therefore,it is the most important task to study the method to locate the fault section quickly and accurately when there is a fault in the distribution network with distributed power supply.Firstly,this paper briefly describes the research status and development background of distribution network fault location at home and abroad,and expounds the mainstream distribution network fault location methods at home and abroad.then the fault types and causes of distribution network as well as the basic concept and classification of distributed power supply are introduced,and the impact on distribution network caused by the access of distributed power supply is summarized.Secondly,the basic principle,model,reasoning and algorithm flow of Petri net and the application of Petri net in fault location of traditional distribution network are analyzed.Because the distribution network will become more complex after being connected to a large number of distributed power sources.As a result,the fault location method of Petri network with distributed power supply iscomplex and has a large amount of calculation,so it is difficult to meet the requirements of fault location of distribution network with distributed power supply.Therefore,this paper selects the particle swarm optimization algorithm to optimize the original Petri network fault location method and applies it to the fault location of the distribution network with distributed power supply.The feasibility of the improved algorithm is verified by two kinds of test functions,and then through the simulation analysis of two standard node distribution network examples,it is concluded that the fault location method based on particle swarm optimization Petri network can locate the fault section of distributed power distribution network more quickly and accurately. |
