Modeling and digital control of a high-power full-bridge isolated DC-DC buck converter designed for a two-stage grid-tie PV inverter

This paper describes a grid-tie photovoltaic (PV) inverter composed of an isolated full-bridge buck DC-DC converter with high-frequency transformer and a cascaded DC-AC full-bridge inverter connected to the grid. Emphasis is given on the modeling and digital control design of the DC-DC converter with the polynomial pole placement method. Simulation results are presented and a inverter prototype is currently being built.

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