ANALYSIS AND DETECTION OF TRANSIENTS IN ISLANDED MICRO-GRIDS USING WAVELET TRANSFORMATION

摘要

New challenges are presented for reliable operation of the power system due to increasing penetration of distributed generations (DGs). The low inertia of the generator and their power electronics interface decoupled from the grid makes it much more difficult to maintain system stability, especially for islanded micro-grids. To ensure the power quality and system reliability, the accurate and effective detection of transient signals is required. This paper utilizes wavelet transformation to detect and classify the transient signals in islanded micro-grids. The results show that the disturbances are successfully identified by applying wavelet transform in both simulation and experimental conditions. The classification of disturbances was also investigated. Coefficient spectrums and histograms are plotted to identify different disturbances in the micro-grid.