The On-line Power Quality Monitoring System Based On Embedded Linux

With the electronic devices and other nonlinear loads used in power network, the nonlinear, the instability and the unbalance of the voltage have become more and more serious.By the on-line and real-time monitoring, recording and analysis, the necessary evidence can be provided to improve the power quality, formulate correlative solve measure , establish technical parameters of controlling device.At first the paper introduces particularly power quality research state and development trend in both overseas and demestic,more detailedly explains the steady power quality of national standard, and summarizes measurement theories and arithmetics of all kinds of power quality criterion. Specially, the measurement theories and methods on harmonics, interharmonics in electric power systems are studied in depth,these provide necessary theory and detecting arithmetics for WPQ1000A power quality monitor meter.On the basic of the theory, then this paper discuss system manage technique in embedded Linux.Considering the characteristics of the item, it advises the item adopt three layers framework model,also researchs and explains the partition and design of the applications soft subsystem. Because QT is the most popular graphics design tool in Linux operating system, its empolder process are studied in depth in this paper,and a good resoluble method is offered about the question that the size of Chinese character QT shows is not same. Finally, based on the research results,the paper successfully designs a power quality monitor meter based on embedded Linux operating system.This meter adopts advanced and reasonable handware framework of superstratum plus substrate machine,embeds Linux operating system and QT, 32 bit high speed float DSP sample data ,through HPI bus interface datas are sent to Emdeded industry control computer based PC/104 bus, are analysed and processed by applications program,at last it realizes monitor and analyse function of high accuracy,multifunction.The power quality monitor meter has been researched successfully, and has been produced a little number,through the customers' feedback by using , the system has high reliability, high measure definition,wide application,convenient maintenance and good anti-disturb ability. It also proves the validity and application value of the research production of this paper.