Power quality disturbance detection in grid-connected wind energy system using wavelet and S-transform

S-transform and wavelet transform based approach for detection of different power quality disturbances like voltage sag, voltage swell, momentary interruption, notch and oscillatory transients in grid-connected wind power system is proposed in this paper. The voltage signal at point of common coupling is used in detection of the disturbances. The excellent time-frequency resolution characteristic of S-transform is exploited for detecting various power quality disturbances. The simulated results clearly reflect the advantages of S-transform over wavelet transform in localizing and detecting the power quality events even under noisy conditions.