Research and Design of Intelligent Electric Power Quality Detection System Based on VI

Electric power quality problem has become an important problem in modern society, which effects industrial production and product quality, etc. So, we urgently need monitor and analyze electric power parameter to solve electric power quality problem. In this paper, we design a kind of electric power parameter detection system based on visual instrument (VI) technology, etc. System uses voltage/currency transformer module and signal processor module to realize electric power network analog signal conversion. System adopts multiplexing technology, which solves multi data acquisition card (DAQ) using complexity problem as well as saving cost. In addition, system software adopts method of wavelet resolution analysis combining with FFT, which solving FFT disadvantage in analyzing non-steady distortion signal. System is applied to harmonic monitor, voltage fluctuation and flicker monitor, etc. This paper mainly introduces system’s structure, algorithm simulation, part of hardware and software design in detail. Through experiment, monitor error of harmonic wave’s THD% is 0.01%, and amplitude wave’s frequency and amplitude of voltage flicker is respectively less than 0.01Hz and 0.005V, which obtains accuracy result in high monitor precision as expectation.