A Crest Factor-Based Voltage Sag Quantification Method

A fast detection and an accurate estimation of the voltage sags duration are highly desirable in the design and development of power quality (PQ) indices & mitigating devices. Therefore, in this work, a new method, based on crest factor (C.F), has been presented for the accurate quantification of the voltage sag. The window-based technique has been used for the estimation of the ‘C.F’. Further, the voltage sag signal, from the IEEE database, has been considered to test the efficacy and correctness of the proposed method. It has been revealed that the estimated duration is exactly the same as the real voltage sag duration. Also, the proposed method shows efficacy by providing the exact information about the voltage sag initiation and recovery. The outcomes of the proposed method are compared with the other existing voltage sag quantification methods. It is shown that the proposed method provides 0% error in the estimation of sag duration while the R.M.S, peak, and hybrid voltage have 34%, 40%, and 3%, respectively. Additionally, the detection delay of the proposed method is found zero while the peak voltage method provides a maximum delay of 16.75 ms. Therefore, the method presented in this work is not only efficient in the estimation of the duration but also capable of the detection of voltage sag and waveform distortion.