Interactive detection method applied in DVR

To satisfy the real-time and accuracy requirements of voltage sag detection, an interactive Dynamic Voltage Restorer (DVR) combined generalized S-transform and RMS is proposed. Generalized S-transform is improved by time-frequency aggregation performance criteria, to obtain high time-frequency resolution, realizing the detection and localization of mutation signal. The generalized inverse S-transform is performed on the processed mode to get the effect of de-noising and filtering. Based on the effective value detection method, the value of voltage sag is calculated, and the interactive voltage sag detection is realized by isolating the switch. This method can improve the detection accuracy and response speed of DVR, and have good signal de-noising ability. Finally, the feasibility and timeliness are verified by simulation and experiment.