广东工业大学硕士学位论文 ABSTRACT With the development of digital substation,IEC 61850 will become the unified protocol of the power system in future.How to bring the existing substation communicating by CDT,101 or 104 protocol into the IEC 61850 substation communication system,is an important topic for the conventional substation's communication system transform to the IEC 61850 system.The protocol converter is the key technology to solve this problem.In this paper,abstracted an typical substation automation system in the transition period,designed a kind of object-oriented protocol converter based on the IEC 61850 protocol.The software has been tested to meet the practical application's basic performance requirements. This paper analysised the establish relationship of IEC 61850,CDT,101 and 104 protocol by Decomposition them to the function and information form,the physical layer,the link layer and the application layer,established the initial mapping relationship between them.This mapping relationship is the basis for the establishment of public databases.Public database build by mapping traditional protocol's telemetering,teleindication to the IEC 61850 model's corresponding set of logic nodes.The public database is a critical component that linking the Protocols. Then expand the protocol converter's object-oriented analysis and object-oriented design using software engineering methods,object-oriented analysis of the protocol converter obtain results of object model,dynamic model and functional model, object-oriented design divide the protocol converter to subsystems,including the data management subsystem and the problem domain subsystem,data management subsystem design to draw a simple form of public database,the problem domain subsystem is further broken down into IEC 61850 substation,CDT,101,104 four modules and given the detailed design of the program modules.Finally,the entire design realized with C++programming language and did unit testing and integration广东-T业大学硕士学位论文 ABSTRACT With the development of digital substation，IEC 6 1 850 will become the unified protocol of the power system in future．How to bring the existing substation communicating by CDT，1 0 1 or 1 04 protocol into the IEC 6 1 850 substation communication system，is an important topic for the conventional substation’S communication system transform to the IEC 6 1 850 system．The protocol converter is the key technology to solve this problem．In th．is paper，abstracted an typical substation automation system in the transition period，designed a kind of object—oriented protocol converter based on the IEC 6 1 850 protoc01．The software has been tested to meet the practical application’S basic performance requirements． This paper analysised the establish relationship of IEC 6 1 850，CDT,1 0 1 and 1 04 protoco l by Decomposition them to the function and information form，the physical layer，the link layer and the application layer，established the initial mapping relationship between them．This mapping relationship is the basis for the establishment of public databases．Public database build by mapping traditional protocol’S telemetering，teleindication to the IEC 61 850 model’S corresponding set of logic nodes．The public database is a critical component that linking the Protocols． Then expand the protocol converter’S object—oriented analysis and object—oriented design using software engineering methods，object-oriented analysis of the protocol converter obtain results o f obj ect model，dynamic model and functional model， object—oriented design divide the protoco l converter to subsystems，including the data management subsystem and the problem domain subsystem，data management subsystem design to draw a simple form of public database，the problem domain subsystem is fuaher broken down into IEC 6 1 850 substation，CD T，1 0 1，1 04 four modules and given the detailed design of the program modules．Finally，the entire design realized with C++programming language and did unit testing and integration II