Power converters used in distributed generation (DG) and microgrids

分布式发电(DG)正成为减少温室气体排放、提高电力系统效率、缓解输电基础设施压力的一种有吸引力的方法。从2002年到2006年，DG在新增发电量中的份额从13%增加到25%。近年来，燃料电池、光伏电池、风力发电机等基于可再生能源的电力电子接口分布式发电系统在世界范围内得到了较大的发展。微电网是这些分布式发电系统为了更高的效率、更大的容量和控制的灵活性而进行系统组织的最新概念。微电网可以在并网或孤岛模式下运行，在效率、可靠性和电能质量方面对电力公司和用户都有好处。

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.