Research On Electric Field Modeling And Real-time Monitoring System Of High Voltage AC Transmission Line

Since the reform and opening up,the domestic economy and society have shown a rapid development momentum,the obvious improvement of the quality of life,and the increasing demand for electricity and its quality.How to ensure the quality of power transmission and improve economic efficiency and environmental protection level has become the focus of the power industry.In recent years,the rapid development of highvoltage transmission technology provides effective solutions,but also brings a series of problems.Among them,the main problem is that the strong electromagnetic field caused by high-voltage transmission brings harm to the normal life and health of the residents near the transmission line.Therefore,how to effectively monitor the electromagnetic field near the transmission line has important research value.Therefore,how to effectively monitor the electromagnetic field near the transmission line has practical research value.However,when the transmission line crosses the ground buildings,the electric field below will be distorted due to environmental factors.How to measure the weak electric field signal effectively and accurately in a narrow space has become a key problem in electromagnetic environment research.At present,there is little research on the measurement principle and system of non-uniform electric field in China.In this thesis,a weak signal electric field monitoring device is designed,which can effectively monitor the electric field of residential houses and vegetable greenhouses near the transmission line.The main research contents are as follows:(1)This thesis makes a brief comparative analysis of the development status of transmission lines at home and abroad,and analyzes the types,advantages and disadvantages of the current electric field monitoring devices.The simulation charge method and finite element method are compared and analyzed(2)The theory of electromagnetic field is introduced,the numerical calculation method of simulation charge method is analyzed,and the simulation model of transmission line is established with MATLAB simulation.The characteristics of electric field distribution near houses and vegetable greenhouses are analyzed.(3)Research and design the hardware circuit of the acquisition device.Firstly,MEMS electric field sensor and microprocessor stm32f103rct6 are analyzed and selected.According to the design of conditioning circuit for MEMS sensor,the data transmission communication module,power supply module and charging module are analyzed and designed.Finally,the EMC design is carried out to improve the anti electromagnetic interference ability of the device.(4)Design the software of the system.It includes electric field monitoring and acquisition device and upper computer(database and display interface)software.The software part of the acquisition device includes the design of main program,ADC program,filter design and wireless communication design.(5)Set up the standard environment of electric field,calibrate the device in the standard field,set up the standard environment of electric field,test in the actual environment,compare and analyze the test results and simulation results,and verify the effectiveness of the device design.In general,this thesis will discuss the electric field simulation in the area near the transmission line,the design of software and hardware of the monitoring system and the debugging of the system in detail,so as to improve the validity of the simulation model,the measurement accuracy of the monitoring system and the reliable and economic operation of the transmission line.