Research Of Programmable Microprocessor Monitoring & Protection Device For Smart Grid

As the power system has been reformed,the relay functional requirements of protection device present a individualized trend. For power industry and several of manufacturer power system automation equipment, developing a set of measuring and protection device,the relay logic of which is programmable, has significant value in engineering research and application.At present, microprocessor protection devices are designed mostly for a special type,they have poor reusability and have encountered many problems in practical application. To solve these problems, the paper design a relay logic programmable microprocessor measuring and protection device.In the design process,this paper not only combines the existing power system automation project experience, taking into account the needs of the power system and power system automation technology trends.The content of this paper is divided to three parts:the graphical program programming software platform;protection device hardware;protection device software.With the reference to the idea of class in object-oriented programming,the programme source file of relay protection is divided into three parts,when the compile model of graphical program programming software platform is designed.The converting procession from logic diagram programme to STL(statement list)programme also has three steps as follows.Firstly,abstract the DAG(directed acyclic graph)from the logic diagram.Then resolve the DAG at its branch vertex.Output the STL programme which is equivalent to logic diagram programme through traversal.In the hardware design of protection devices, modular thoughts are demanded to integrate functionnally similar circuits of the hardware in protection devices into one package. Various modules are combined together in the form of packages and therefore the whole protection device is built up. In the software design of protection devices, the paper illustrates its methods in two aspects respectively:programming state and running state.This paper also sets forth the Fourier Algorithm as well as the method to carry it out on TMS320F2812.At the end of this paper,by configuring the programmable protection device to a line protection,and the corresponding relay test,it authenticate that the protection device has achieved the design objectives.