Four-Port, Single-Stage, Multidirectional AC–AC Converter for Solid-State Transformer Applications

Santos, Cícero Alisson Dos; Mazza, Luan C. S.; Tofoli, Fernando Lessa; Oliveira, Demercil S.; Praça, Paulo P.; Antunes, Fernando Luiz Marcelo

doi:10.1109/tie.2021.3082059

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…One of the most influential groups of power electronic converters is the AC-AC converters. These converters have predominately extended in industrial applications as dynamic voltage restorers (DVR), 1,2 medium-frequency transformer isolation, [3][4][5] gridconnected wind turbines, induction heating systems, 6,7 and variable frequency drive (VFD). 8 AC-AC power converters are generally classified into three categories.…”

Section: Classifications Of Ac-ac Convertersmentioning

confidence: 99%

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An isolated high‐gain impedance source‐based single‐phase AC–AC converter with safe commutation and variable output frequency

Abdoli

Mosallanejad

2023

Circuit Theory & Apps

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SummaryConventional AC–AC converters have some critical disadvantages, such as inappropriate input and output power quality features, employing snubber circuits to suppress the voltage stress on high‐frequency switches without a safe commutation method that increases the converter size and cost, confined voltage gain, and using huge passive components. This paper proposes an isolated high‐gain single‐phase AC–AC converter with variable output frequency, extended voltage gain, and a safe commutation strategy. Ten semiconductors are only employed for the proposed topology that only two switches and two diodes are operated with high‐frequency PWM signals. This new topology has noteworthy specifications like continuous input and output current, voltage isolation, extended inverting and non‐inverting buck‐boost modes, and frequency regulation. The high voltage gain has been achieved with small values for passive components in the impedance source section, reducing the volume and cost of the converter. The impedance source‐based section of the converter comprises one input inductor, two coupled inductors, and two capacitors in each converter leg. A safe commutation strategy has been designed and applied to the converter to mitigate the voltage and current stresses without extra snubber circuits. The number of semiconductors that simultaneously conduct in each state of the converter has been reduced. So, the conduction loss of the converter diminished. The achieved efficiency equals 95.5% and 93.5% in step‐down and step‐up modes, respectively, validated by an accurate power loss model and experimental analysis. An experimental prototype has been designed to confirm the performance of the suggested converter. Results confirm the theory and operation of the proposed converter.

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Section: Classifications Of Ac-ac Convertersmentioning

confidence: 99%

“…(4) A safe commutation method has been achieved in the proposed switching strategy that eliminates snubber circuits. (5) The acceptable value of the inductors for appropriate operating of the converter is…”

Section: The Proposed Converter Specificationsmentioning

confidence: 99%