6RONAN E R,SUDHOFF S D,GLOVER S F,et al. A Power electronic- based distribution transformer [ J ]. IEEE Transactions on Power Delvery, 2002,17(2) :537 -543.
7MONICA CHINCHILLA,SANTIAGO ARNALTES,JUAN CARLOS BURCOS. Control of Permanent-Magnet generators applied to Variable-Speed Wind-Energy systems connected to the grid [ J ]. IEEE Transactions on Eergy Conversion ,2006,21 ( 1 ) : 130 - 135.
8ULLAH N R,THIRINGER T. Variable speed wind turbines for power system stability enhancement[ J]. IEEE Transaction on Energy conversion, 2007,22( 1 ) :52 -60.
