Desig n of Power Quality Monitoring System based on LabVIEW

Abstrac t—In the paper, it is introduced that the design of a power quality monitoring system based on LabVIEW for factory power quality, with LabVIEW as development platform, composed by some functional modules such as data acquisition, data processing, data storage, and data report, etc. and making an access to Microsoft Access database using LabSQL to achieve data acquisition, processing, storage and analysis. I. INTRODUC TION In recent years, a great quantity of electrical loads characterized by non-linearity, impact strength and unbalance at the user side have caused a serious interference and pollution to the quality of power supplied. The usual problems existing in power quality such as harmonic, asymmetry of the three-phase circuit, voltage fluctuation and flicker, etc. are all becoming worse, while, with the development of high-tech. a number of new-type electrical loads which are sensitive to power quality are developing rapidly, requiring high-quality power to be supplied by power system(1-2). Nowadays, the voltmeter having a simple statistical function is widely used in China to monitor the voltage, while, these voltmeters can only monitor the qualification rate of voltage, and for lacking the functions of statistics and analysis, it is necessary for us human to read and record the data(3-4). However, with respect to the measurement of harmonic and voltage fluctuation and flicker, the portable measuring instrument is applied to make an on- site measurement, and according to the data measured, a summarization and statistical analysis will be carried out to make an evaluation on the quality level of the power supplied by the power system. In consideration of the problems existing in the current online monitoring instrument, and in line with the state-level standards concerning power quality in China, an online power quality monitoring system based on LabVIEW which is suitable for the power quality monitoring, management and analysis at the workshop level is designed.