Efficient on-line detection scheme of voltage events using quadrature method

Short-duration RMS voltage variations, namely sag, swell and interruption, are characterized by the variations of RMS voltage values and time durations. In this paper, the quadrature method for calculating RMS voltage is used to efficiently detect these power quality events. For comparison, the same power quality events are detected using conventional RMS calculation methods. Different voltage events are simulated and the results of the quadrature and conventional methods are compared. An experimental real-time monitoring system for voltage events based on the LabVIEW platform is built, and several voltage events are tested and evaluated by the developed setup using quadrature and conventional methods. Both simulation and experimental results validates the superiority of the quadrature method for most of the considered scenarios in terms of accuracy and robustness.