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Isolated Single-Stage DC–AC Flyback Inverter for Off-Grid Photovoltaic/Fuel Cell Applications With Reduced System Components
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DOI：10.1109/tpel.2026.3696224.png)
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Abstract
En 中文
This article proposes a single-phase compact, isolated, single-stage flyback inverter (S<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>FI) for photovoltaic and fuel cell applications. The proposed S<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>FI is designed to minimize the number of components and employ a structure that utilizes two flyback modules for single-stage DC–AC conversion with voltage step-up capability, leveraging the operation of a voltage-source inverter. In addition, the S<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>FI design provides galvanic isolation, rendering it suitable for off-grid applications. The integration of the flyback high-frequency transformer with the converter's primary inductor in the proposed structure results in a reduced footprint, a simplified control system, and a decreased number of components and gate-drive circuits, ultimately leading to overall inverter cost minimization. This article encompasses theoretical analysis, mathematical modeling, exploration of mathematical loss models, and comparative analysis to evaluate the primary features of the proposed inverter in comparison to its counterparts. Furthermore, the proposed S<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>FI has been rigorously validated through simulation and an experimental prototype rated at 1 kW, with a switching frequency of 50 kHz, confirming its efficacy. The proposed S<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>FI exhibits enhanced harmonic content and operating efficiency for DC–AC conversion (THD < 3.5%, η > 91.5%), with experimental results corroborating the theoretical and simulation findings.
Keywords:
Inverter mathematical modeling
isolated single-stage flyback inverter (S2FI)
mathematical loss analysis
single-phase inverter
standalone voltage-control
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6.5
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1.7W
Citations:
8.3W
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