Design Of Intellectual Power Distribution Terminal Based On Embeded System

With the developing of city and country power distribution network, comby power distribution net with multi distribution passes has come into being. The running mode of the new distribution net is so flexible that it is hard to run it only by the dispatchers' experiences. So artificial intelligence must be developed imminently to corporate, even to replace dispatchers to do the optimal dispatch in time. Artificial intelligence dispatch can also ensure safe run of the net, reduce the run charge, increase economic benefit, improve the net's reliability and exert the power distribution net's potential furthest. It can promote this direction to develop continuously and steadily.Now, dispatchers can control the switch on pole through the new power distribution automation system which they have to do by climbing up the pole in the past. It takes some new methods such as Unmanned distribution station and switch station, remote data collection, auto storage of reports forms and curves and operation records, construction of distribution GIS and customer service system, etc. to educe the working intensity and increase the service quality. The distribution system relied on dispatchers' experiences is replaced by the intelligent one relied on artificial intelligence step by step.The precondition of the distribution automation is that mastering electric parameters of some important nodes of the net, such as voltage, current, power, power quality, etc. So large numbers of intelligent distribution automation terminals that have remote communication function are required to get real-time information of distribution net and to send some controls.With the developing of electronics, computer, network, communication and embedded system and the construction of city and county power distribution net, some intelligent terminals appear. These terminals have abundant functions, cheap and high quality communication, more reliability and stabilization compared with old ones. Some terminals have already control functions. Combine the distribution actuality with it's requirement , a new type of terminal that is based on embedded system and has multi communication channels is designed in this paper. The designed terminal can collect too many electric parameters such as voltage RMS, current RMS, digitalwaveform of voltage and current, active power, reactive power, apparent power, frequency and current temperature etc. It also has three pulse data channels, eight analog data channels. The terminal has good quality and low cost communication channels such as Ethernet communication, GPRS, expect traditional RS232 and RS485.In the paper, the terminal's functions are described detailed at first. And, gives some base knowledge that is used in the process of design, such as embedded system, GPRS, database program of VC , PCB design and so on. Then, gives the terminal hardware design in details, including power design, reset circuit, communication system, pulse data channels and electric parameters collection channels. At last, gives the terminal's software design, consisting of OS, drivers, communication programs, data collection programs and background application software.This designed terminal has embedded operation system uClinux to govern hardware. It has high quality and low cost communication channels , such as GPRS and Ethernet communication, and too many data collection channels; It has high reliability and good quality-price ratio.