The Research And Design Of DC Synthetic Electric Field Measurement System For UHV DC Transmission Lines

In high-power,long-distance transmission projects,the DC transmission system has incomparable advantages over the AC transmission system.Therefore,in recent years,our country has vigorously promoted the construction of the UHV DC transmission network.UHV DC transmission in network security play an irreplaceable role in the great and stable operation of the power system of our country,but it also brings some new problems to the adjacent environment of transmission lines.The operation of the UHV DC transmission line increases the DC synthesis electric field in the surrounding space,causing electromagnetic interference to the electronic communication equipment in the vicinity and adversely affecting the human body and other organisms.With the increasing awareness of health and environmental protection,the public attaches more and more importance to the electromagnetic environment of UHV DC transmission lines,and the demand for government departments to strengthen supervision is also becoming more and more intense.This dissertation mainly studies and designs the DC synthetic electric field measurement system for UHV DC transmission lines.In view of the disadvantages of the existing DC synthetic electric field measurement instruments in field measurement,a DC synthetic electric field measurement system with easy operation,high accuracy and easy for experts to analyze data is developed by using the existing electric field measurement principles,embedded technology and wireless communication technology.The main research contents are as follows:(1)Analyzing and comparing the advantages and disadvantages of different electric field measurement schemes,the dissertation formulates the overall system plan according to the actual needs of the project.(2)Based on the established overall system plan and the previous design experience,the electric field measurement sensor is optimized and the sensitivity and accuracy of the sensor are improved.(3)The hardware and software of the system are designed to realize the accurate measurement,real-time display,storage and statistical analysis of the DC synthetic electric field.(4)A calibration experiment platform was set up to calibrate the measurement system.During the experiment,the MEA-BP neural network was used to correct the data,which provided a more accurate measurement data for the subsequent analysis.(5)The practicality of the system is verified by the actual measurement under the UHV DC transmission line,which indicates that the system is suitable for the measurement of the DC synthetic electric field of the UHV DC transmission line.This dissertation will be elaborated based on System overall plan,electric field sensor design,system hardware and software design,and system debugging.