Micro-inverter for integrated grid-tie PV module using resonant controller
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Two-stage isolated converters for photovoltaic (PV) applications commonly employ a high-frequency transformer on the DC-DC side, submitting the DC-AC inverter switches to high voltages and forcing the use of IGBTs instead of low-voltage and low-loss MOSFETs. This paper shows the modeling, control and simulation of a single-phase full-bridge inverter with high-frequency transformer (HFT) that can be used as part of a two-stage converter with transformerless DC-DC side or as a single-stage converter (simple DC-AC inverter) for grid-connected PV applications. The inverter is modeled in order to obtain a small-signal transfer function used to design the PResonant current control regulator. A high-frequency step-up transformer results in reduced voltage switches and better efficiency compared with converters in which the transformer is used on the DC-DC side. Simulations and experimental results with a 200 W prototype are shown. © 2012 IEEE.
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AC-DC power converters, distributed power generation, modeling, photovoltaic systems, power transformers, pulse width modulation inverters, DC-AC inverters, Full-bridge inverters, Grid-connected PV, High frequency HF, High voltage, Low-voltage, MOSFETs, Photovoltaic, Photovoltaic systems, Pulse width modulation inverters, PV modules, Resonant controller, Single stage converters, Small-signal transfer functions, Step up transformers, Transformerless, Two-stage converter, DC transformers, Distributed power generation, Models, Power transformers, DC-DC converters
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IEEE Power and Energy Society General Meeting.
