Micro-inverter for integrated grid-tie photovoltaic module using resonant controller

摘要

Two-stage isolated converters for photovoltaic (PV) applications commonly employ a high-frequency transformer (HFT) on the DC–DC side, submitting the DC–AC inverter switches to high voltages and forcing the use of insulated-gate bipolar transistors instead of low-voltage and low-loss metal-oxide-semiconductor field-effect transistors. This paper shows the modeling, control and simulation of a single-phase full-bridge inverter with 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 to obtain a small-signal transfer function used to design the P + Resonant current control regulator, whose main advantages are the simplicity for implementation in single-phase systems and zero steady state error with sinusoidal current. A high-frequency step-up transformer results in low-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. Copyright © 2013 John Wiley & Sons, Ltd.