Voltage notch detection and localization in power quality signals in phase space

The paper presents an algorithm to be used in detection and localization of the voltage notch disturbances in the power-quality signals based on the phase-space reconstruction. The algorithm which is based on detecting events in the phasespace domain using the Euclidean distance calculation is implemented, tested and designed in MATLAB both on simulated power-quality signals with various voltage notch disturbances, modeled according to the IEEE 1159 standard that provides power-quality recommendations, and on real power-quality signals obtained from the PQSoft Waveform Library. The results show that the algorithm successfully detects and localizes disturbances at a sufficiently high accuracy. From simulated signal database and real signals all periodic notch disturbances were detected and localized.