Power converters used in distributed generation (DG) and microgrids

分布式发电（DG）正在成为一种有吸引力的方法，以减少温室气体排放，提高电力系统的效率，并减轻压力的电力传输和交付基础设施。从2002年到2006年，DG占新发电量的份额从13%增加到25%。近年来，基于燃料电池、光伏电池、风力发电机等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很大的发展。微电网是这些DG系统的系统化组织的一个较新的概念，用于更高的效率，更多的容量和控制灵活性。微电网可以在并网模式或孤岛模式下运行，并在效率，可靠性和电能质量方面使公用事业和客户受益。

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.