Direct AC/AC converter based dynamic voltage restorer with one cycle control

For the energy storage is so large, heavy and not easily integrated, economical AC/AC converters, without DC energy storages, are used to dynamic voltage restore. The virtual rectifying and inverter topology, whose structure is compact and can naturally current commutate, is easily controlled and more reliable. Since that the dynamic voltage restorer (DVR) has strict demand of quick dynamic responses of input disturbances, one-cycle control is chosen to control the system because of its good and rapid ability of input disturbances control. Based on the theory analysis, the output dynamic responses of one-cycle control have been tested. And principle test verify the feasibility of the AC/AC DVR and good dynamic performance of one-cycle control.