Abstract
A novel single phase ac-ac converter with no LC input/output filters is presented in this paper. The proposed converter has all the advantages of the previous single phase impedance source ac-ac converters; it can operate in buck/boost and in-phase/out-of phase with the input voltage, that makes it appropriate for voltage sags/swells compensator without any dc storage. A coupled transformer based on T-structure is utilized to give an opportunity to access desired output voltage with various duty cycles. In this topology snubber circuit is not required, because a safe commutation strategy enables to eliminate voltage and current spikes produced by short-circuit path. In addition, the converter performs in continuous current mode, so there is no inrush current. Also, the characteristic which the output voltage reverses or maintains phase angle with the input voltage is supported well, because the input and output share the same ground. Eventually, circuit analysis, operating principles and simulation results in MATLAB/SIMULINK are presented to verify the performance of the converter.
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