9R. Pena. J. C. Clare. and G M. Asher. Doubly fed induction generator using back-to-back PWM converters and its application to variable speed windenergy generation[J]. IEEE Proc.B, vol 143. no. 3 ,May 2002: 231-241.
10Wang Q,chang L.An Intelligent Maximum Power Extraction Algorithm for Inverter-Based Variable Speed Wind Turbine System.IEEE Transaction on Power Electronics,2004,19(5): 1242 - 1249.
