The Hardware Research On Recording Device Of Voltage Sag And Interruption

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 dynamic voltage quality including sag, swell, interruption and 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). A high-speed and high-precision distributed data acquisition and processing system is designed based on CPU and 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 CPU and slave DSP 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 system can provide comprehensive and accurate recording data for all kinds of issues of power quality.