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    • Detection Method of Voltage Sag Using Modified Stransform

      2010, 37(10):52-56.

      Keywords:voltage sag modified S transform sag magnitude localization
      Abstract (1008)HTML (0)PDF 0.00 Byte (163)Favorites

      Abstract:This paper presented a new detection method of voltage sag feature value, which was extracted from the module matrix of modified Stransform. In order to get the optimal performance, the parameter related to timefrequency resolution was determined on the basis of the flatness and minimal transition time. By means of the optimal timefrequency resolution, the amplitude of voltage sag duration less than 2 cycles could be detected accurately. The difference vector of base frequency was employed to detect sag duration so as to overcome the flaws of exiting Stransformbased methods, whose effects were unsatisfied when there were strong noise and no amplitude abrupt. A comparison between Stransformbased method and modifiedStransformbased method was made, and the results showed that the later was superior to the former in magnitude detection and duration localization.

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