Research On Fault Analysis And Topology Identification Based On Power Line Communication

Smart grid is an important direction for the development of the current power grid,and it is also the focus of the development of China's power industry.In the power system,the power cable is the main facility connecting the load and the user in the system,and is an important part of the serial power network.Power line carrier technology is an emerging technology based on power cables.It has the characteristics of combining power physical network and communication applications,and is a longterm hot research topic in the future.This paper analyzes the characteristics of the power line channel of the distribution network,and analyzes and compares the different characteristics of the power line channel.This paper analyzes the characteristics of power line channel in distribution network,analyzes and compares the different characteristics of power line channel,and analyzes the channel attenuation of power line.It proposes to establish multipath channel model for power channel by nonlinear least squares parameter estimation method.Secondly,it analyzes the failure of power cable aging and gives an overview of different types of aging methods.Determining whether the power cable is faulty according to the detection of the change of the power cable parameter,and simulate the amplitude of the transmission function under single channel parameters and multichannel parameters respectively.The simulation results show the relationship between power cable parameter changes and power line faults,and analyze and study the highimpedance fault location based on power line carrier applications.Finally,the paper analyzes the topology identification of power cable network and compares it with subspace method and matrix pencil method.For network topology reconstruction,based on root neighboring method,dynamic tree reconstruction method is used to realize network topology reconstruction.Proposed a power line network topology sensing method based on arrival time ranging and network layer-by-layer reconstruction.And evaluate the performance of the time of arrival ranging algorithm and the network topology reconstruction algorithm.Verify the effectiveness of the method.