Design And Research On Wireless Communication Terminal Of Intelligent Monitoring System Of Auxiliary Equipment In Substation

The centralized monitoring of auxiliary equipment in substations plays an increasingly important role in promoting the development of smart power grid and unattended substations.However,at present,the auxiliary equipment in the substation is either unable to establish monitoring,or an independent management system is set according to the category,and each system operates independently.Therefore,it has become an important research problem to establish different types of auxiliary equipment in the integrated monitoring system.Based on the establishment of the framework of substation auxiliary equipment monitoring system,aiming at the traditional control switch of auxiliary equipment in the station,this thesis studies the wireless terminal technology,designs the wireless communication terminal to replace the traditional control switch,so as to get rid of the constraints of cables and realize the monitoring of auxiliary equipment in the station.The main research contents include the following aspects.Firstly,the thesis analyzes the terminal requirements.Based on the distribution location and quantity of auxiliary equipment in a substation,it analyzes and determines the architecture of the whole wireless communication network,the construction mode of terminal node network and the overall monitoring scheme of terminal node to auxiliary equipment.The functional requirements of wireless communication terminals are analyzed,including antenna performance,terminal circuit functional requirements and non-functional requirements of installation applications.Aiming at the key problem of wireless communication conversion of the terminal,the antenna used in the terminal is studied and designed.Based on the antenna miniaturization technology,the electrical and radiation characteristics of inverted-F antenna are studied through the basic theory of antenna,the main structural parameters of antenna are determined,modeled and analyzed,and the influence of antenna structural parameters on antenna performance is analyzed.According to the analysis of the performance requirements of the terminal antenna,the quasi Newton algorithm is used to optimize the basic performance of the antenna to meet the design requirements,which is loaded and applied to the terminal circuit.Based on the functional requirements analysis of the terminal circuit,the overall circuit is designed.Based on the module analysis method,the composition of terminal circuit modules is analyzed and divided.On the basis of the main circuit design rules,each module circuit is designed and combined to complete the overall terminal circuit schematic diagram.Draw the terminal PCB circuit according to the PCB circuit design principle.Based on the analysis of transmission,transmission,crosstalk and other signal interference factors,the transmission line and impedance control of the circuit were analyzed to complete the overall design of the terminal circuit board.Finally,the thesis tests the application performance of the designed wireless communication terminal.Based on the substation auxiliary equipment monitoring system,the test scheme is designed to the networking performance and reliable transmission distance of wireless communication terminals in different environments.A functional test platform is built to test the realization of various functions and operation stability of the terminal in the monitoring system.