Submitted on: 12 February 2011.
Revised on: 05 May 2011.
Accepted on: 28 June 2011.
___________________IEEE Power Electronics Magazine
Submitted on: 26 November 2009.
Revised on: 07 January 2010.
Accepted on: 15 February 2010.
___________________IEEE Power Electronics Magazine
http://reply.papertrans.cn/2/119/11885/11885-33.png
http://reply.papertrans.cn/2/119/11885/11885-34.png
http://reply.papertrans.cn/2/119/11885/11885-35.png
http://reply.papertrans.cn/2/119/11885/11885-36.png