Research On Key Technology Of Digital Simulation Platform For Intelligent Substation

With popularization of the intelligent transfer substations in China and development of its relevant technologies,the digitization and informationization of the secondary system for intelligent substations have risen to a new level.The interrelation,collaboration and integral arrangement of the secondary equipment in substations have become increasingly important.Therefore,only unit test for the secondary equipment has become insufficient for the demands of daily operation and maintenance of intelligent power substations.In the meantime,with rapid development of the computer technology,intelligent power graphic software systems have already been able to visualize the network structure and the equipment of the power system.As a result,such power graphic software systems have gradually become significant research tools to study the function and fault simulation of power systems,as well as relevant calculation.They have been widely used in the core domains of construction,operation and maintenance,as well as scientific research of the power system.This thesis mainly studies the relevant technologies for the overall integration test of intelligent substations’ secondary systems.Firstly,it introduces a research program for the full-scene testing system of intelligent substations.The program uses digital simulation platform to achieve graphical simulation of the equipment structure and faults of the substations’ primary systems.In this process,the simulation signal will be synchronously injected into the secondary systems of intelligent substations through wireless transmission platforms.In this way,overall technical performance and functions of the secondary systems will be tested.Secondly,with full-scene testing program at the core,the thesis designs a new type of digital simulation software with C language.Based on the design idea of object-oriented technology,this software describes the primary equipment’s graphic elements and builds a graphic modeling for primary equipment.It also constructs an electric power graphic element class library to realize the basic operation functions of the graphics.At the same time,in order to further extend the advanced analytical ability of the simulation system and achieve advanced analysis of the graphics simulation system of power networks,the software fulfills the functions of automatic capture of graphics and input of graphic parameters,on the basis of integrating the operation characteristics of the primary equipment in power networks.Thirdly,in the aspect of digital simulation software,the thesis illustrates the modeling of four types of key equipment: power transformers,electronic instrument transformers,acquisition simulators and switch simulators.With the help of modeling examples,the parameters of these four types of key equipment are set.Besides,the thesis also further explains the display function of time-domain waveform realized by the software.Finally,the thesis discusses the use of wireless transmission technology in realizing the time-domain data transmission of digital simulation software.This thesis studies the key technology of the wireless transmission platform,and analyzes the technological characteristics of the hardware in the wireless controlling computers and slave computers.Based on practical situations of the substations and relevant technical indexes,the thesis puts forward demands for the performance characteristics of the wireless transmission and constructs the wireless transformation platform both in hardware and software.