Study On Electromagnetic Environment Of High Voltage AC And AC/DC Parallel Transmission Lines

Electromagnetic environment is defined as the sum of all electromagnetic phenomena existing in a given place.It's main influence factor is electromagnetic radiation,which endanger human health and electrical equipment caused by electromagnetic interference.At present,continuous development of EHV,common corridor of lines,lines near residential areas,electromagnetic interference problem is becoming more and more serious,so it is necessary to study on electromagnetic environment of EHV transmission lines.Correctness of CDEGS model is verified by comparing the results of MATLAB programming and CDEGS simulation.This paper researches on electromagnetic environment in different conditions,such as different circuit structures,wire parameters,weather and altitudes,by CDEGS software.Electromagnetic interference of EHV AC transmission lines during normal operation on pipeline is researched on the basis of the model.When the relative position of pipeline and line is changed,such as different horizontal spacing,cross angle,asymmetric cross and cross angle from small into big,and pipelines have multiple breakage points,this paper analyzes distribution of induction voltage and current of pipeline in these conditions by simulating.At the same time,when single-phase grounding fault occurs in transmission lines,tower span and grounding resistance are changes,distribution of voltage and current of tower and pipeline is analyzed and studied.According to the simulation results,appropriate protective measures are put forward.The model of EHV AC transmission lines are parallel with UHV AC is established.This paper studies variation law of electromagnetic environment in different line arrangement,such as single-single,double-single,single-double,double-double,different line spacing and transmission lines cross.And this paper researches variation of electromagnetic effect on pipeline with different horizontal distances and cross angles under the situation of lines parallel and cross.Compared with the results of MATLAB and CDEGS,it is concluded that model of CDEGS is closer to reality.This paper simulates electromagnetic environment and electromagnetic interference on the pipeline of AC/DC parallel transmission lines,and researches on electromagnetic environment by changing the relevant parameters,such as AC/DC line spacing,electrode spacing,AC and DC wire parameters.Electromagnetic environment of AC/DC parallel transmission lines is optimized,such as different implementations of AC/DC parallel and setting up coupling ground wires.Optimization method of electromagnetic environment is found and verified by simulation...