Study on some key problems and technique related to microgrid

Characteristics of distributed generation microgrid technology are introduced.The influence of distributed generation microgrid on the voltage ,f requency and harmonics is analyzed in detail and the corresponding solutions are provided.Control methods are classified according to the grid-connected and island operation modes of microgrid and the control strategies as well as the advantages and disadvantages of each method are presented.Since distributed generations exert influence on microgrid, novel protection strategies suitable for microgrid are introduced.In the end the trend is put forward for future research in microgrid.