Research On FFT Arithmetic Based On DSP And Its Application In Release

Release is one of the most important electric apparatus in power supply system. In order to protect power system and equipments, release must provide the function of breaking and making short circuit current, faults diagnosis, Intelligent protection, remote network control and centralize management of the electric network.By applying the micro-controller of DSP , micro-electronics and field bus technology into the intelligent release, people can realize the intelligentize and function combination of tradition apparatus. Also we can make the control of intelligent apparatus automated by using the field-bus communication technique. By the research of field-bus and low-voltage intelligent release in-country and out-country , some key design techniques of communicated intelligent release are concluded in this paper.The paper mainly researches all sorts of measuring and protecting arithmetic about intelligent release, which based on using FFT arithmetic to analyze the harmonic, and the way of using in DSP, also brings forward better measure to improve the errors about FFT arithmetic, discusses two communications methods used by the RS-485 communications and CAN communications, using SCI and CAN interface TMS320F2812 embed. Because CAN-BUS has many strongpoints of long distance and high speed of communication, better real-time monitoring, strong anti-jamming and easy to connect to network , so the software and hardware design of the CAN-BUS is the emphases of this paper.This paper demonstrates demonstrats explicitly the design of the hardware schematics and software of the system, which DSP chip TMS320F2812DSP produced by TI incorporated is adopted as key processor . The paper describe the funcations, work principle and theory gist of design about intelligent release specificly. The functions of A/D sample, display, output, intelligent protections, control and perform are realized by interfaces expanded based on DSP Starter Kit. And the following functions are realized by CAN-BUS in electricity system, suchas telemetry, remote communication, teleadjusting and remote control. Also it is particularly presented that the anti-jamming measures on the design of software and hardware.