Pena R.Clare J C.Asher G M Doubly fed induction generation using back.to.back PWM converts and its application to variable-speed Wind energy generation 1996(3是什么意思_Pena R.Clare J C.Asher G M Doubly fed induction generation using back.to.back PWM converts and its application to variable-speed Wind energy generation 1996(3在线翻译_英语_读音_用法_例句