Research on a New Method for Extracting Voltage Sag Disturbance

It’s of great significance to extract the voltage sag disturbance with high signal-to-noise ratio (SNR) as the source of the voltage sag can be accurately traced by analyzing the disturbance. Three disturbance extraction methods and their respective advantages, disadvantages and applicable scenarios are summarized. In order to overcome the shortcomings of the existing methods, a new voltage sag disturbance extraction method with high SNR based on the idea of sine wave reconstruction is proposed. Compared with the existing methods, the new method has better performance in PQM sampling frequency, disturbance duration, and PQM recording requirements.