Abstract
In this article, a high-gain isolated buck-boost ac-ac converter is introduced, designed by a new impedance source. The proposed single-phase structure benefits from safe commutation, continuous input current, galvanic isolation between the input and output terminals, and both inverting and non-inverting modes with enhanced voltage coverage. Also, only one switch operates with high-frequency PWM signals, reducing the switching losses. Unlike previous topologies, the galvanic isolation feature has been provided through a high-frequency transformer (HFT), getting the circuit rid of bulky low-frequency transformers (LFT). A safe commutation strategy has been applied to the converter to mitigate the voltage and current spikes. Thanks to this solution, extra snubber circuits have not been required anymore. A simple prototype has been designed to evaluate these claims. The converter performance in stand-alone mode is tested, and its application as a dynamic voltage restorer (DVR) is represented. The peak achieved efficiency is 96.2% and 94.8% in inverting and non-inverting step-down and step-up modes, respectively. The experimental results confirm the theory and operation of the proposed converter.
Published Version
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