Abstract
This paper describes a bidirectional twisted single-phase single-stage buck-boost dc-ac converter based on an output unfolding circuit. This solution is derived by the combination of an inverting buck-boost dc-dc converter and an unfolding circuit. The operation principle, component design guidelines, along with the control approach are presented. The zero-crossing distortion problem is discussed and solved by a simple approach. The simulation and experimental results confirm all theoretical statements. Loss distribution and achievable efficiency are analyzed. Finally, the pros and cons of the proposed solution, along with the most promising application field, are analyzed and discussed in the conclusion.
Highlights
This paper has presented a novel bidirectional twisted buck-boost converter based on the inverting buck-boost circuit and output unfolding circuit in the grid-connected mode
Simulation and experimental results are confirmed by the theoretical analysis
Summary
A photovoltaic (PV) system stands out among the present and future energy systems. The concept of a near zero energy building requires the presence of additional storage elements, which raises the cost of the overall system. A solar inverter, as part of the PV system, contributes substantially to the overall price and efficiency of the system. In terms of price, efficiency, input voltage range operation, and power density, is the priority task in power electronics research.
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