Digital Control of Two Stage High Power Inverter

With increasing demands worldwide for more electrical energy and the desire to reduce greenhouse-gas emissions, increasing attention is directed at sources of renewable energy, such as photovoltaic and wind, the development of clean distributed generation becomes increasingly important. The electrical output from such sources is small and dc. Coupling such outputs to a constant voltage and frequency grid requires two stages of energy conversion: dc-dc and dc-ac. As small-scale inverters tend to have lower efficiency than larger inverters, it is important to optimize the control circuits and to choose a topology with the lowest possible power dissipation, if they are to compete with larger scale converters. This contribution focuses on such a system and its overall control for the efficient and reliable injection of energy into a grid.