TY  - SER
AU  - Guo, Lei
AU  - Wang, Dan
AU  - Peng, Zhouhua
AU  - Diao, liang
TI  - Direct Voltage Regulation of a Stand-Alone Dfig System with  Non-linear Loads Based on an Improved-Extended State Observer and Ssm Control
KW  - Dfig
KW  - Non-linear Loads
KW  - Stand-Alone
ER  -