Boost Operation of a Dual-Active-Bridge AC-DC Converter with an Active Energy Buffer

This paper proposes a new control method of boost operation for a dual-active-bridge ac-dc converter with an active energy buffer. The proposed control method utilizes three-switching sequence according to the phase angle of the ac-line voltage for realizing the boost and active power decoupling operation. Experimental results including the proposed boost operation demonstrate a wide output voltage range from 170 to 345 V at 220 V input and 5.5 kW output conditions.