Power Quality Monitoring And Analysis System Developed

With the development of power electronic technology and emergency of much non-linear load in power system, the power quality has been more and more deterioration. Aiming at the demand of power department and the practical applications, we put forward a kind of integrated supervisor which can measure and analyze power quality issues (admissible deviation of supply voltage, permissible deviation of frequency, harmonics in public supply network, voltage fluctuation and flicker, admissible three-phase voltage unbalance factor and disturbance). Such system is composed of the measure device on substation terminal and the software platform of the supervisory center.A high-speed and high-precision distributed data acquisition and processing system is designed based on DSP in this paper. The synchronous data sampling of the supervising system is realized by multi-channel collection retaining and A/D transformation circuit. Data between the master and slave DSPs can be transferred by dual-port RAM. According to the special characters of the electronic power system, the algorithm implementation of digital signal processor is presented.The software development adopts blocking design method. It includes three blocks: interface block, communication block and database block. It becomes possible that analyze, store and manage a great deal of measure data of power quality by using MS SQL database. This software can synthetically statistics , figure displaying, report print and so on, aim at the many issues of power quality.The system can provide comprehensive and accurate recording data for all kinds of issues of power quality. Besides, the software realizes various functions, such as various displays of results, database management and so on.