Smarttrafo and flicker

In this paper it is shown that the switching of the power electronic switches can be cause (source) of the flicker. A new switching technique implemented to control a single-phase tap changed-transformer in order to eliminate the internal flicker problem is investigated. The suggested method was subjected to both theoretical and experimental investigations. Further in this paper a method to mitigate a cyclic voltage flicker using electronically switched tap changed transformer is investigated. The idea of this method is based on injection of a signal, with the same frequency rate as that of the flicker, into the feedback path of the controller. This method utilizing electronically controlled tap-changed transformer provides flicker free secondary voltage