DETECTION AND CHARACTERIZATION OF VOLTAGE SAG USING WAVELET TRANSFOR

This paper presents a new technique for detecting and characterizing voltage sag in power systems based on wavelet transforms. Using the first detail wavelet coefficients, voltage sag characteristics are extracted. This paper presents a MATLAB simulink model implementing the wavelet transform and the values of characteristics are displayed. For this purpose the wavelet technique is used for detecting starting a nd ending points of voltage sags by energy coefficient. The method is developed by using the discrete wavelet transform analysis