Comparison of different voltage dip detection techniques

To accurately determine the beginning and the end of voltage sags is very important for the actuation of a system that is connected to the grid and must have ride-through capability. This paper analyses four voltage sag detection methods, comparing both detection speed and reliability, not presenting false detections and providing a consistent signal during all the gap duration. In particular, it has been analysed the behaviour of the detection methods when voltage waveforms present harmonics due to power electronics switching.