Power converters used in distributed generation (DG) and microgrids

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Distributed Generation (DG) is becoming an attractive approach to reduce greenhouse gas emissions, to improve power system efficiency, and to relieve stress on power transmission and delivery infrastructure. From 2002 to 2006, the DG share of new electricity generation output has increased from 13% to 25%. In recent years, power electronic interfaced DG systems based on Renewable Energy Sources (RES) such as fuel cells, photovoltaic cells and wind turbines have experienced a large development worldwide. The microgrid is a more recent concept of systematic organization of these DG systems for higher efficiency, more capacity and control flexibilities. A microgrid can operate in grid-connected mode or islanding mode and benefits both the utility and customers in terms of efficiency, reliability and power quality.