A super-synchronous doubly fed induction generator option for wind turbine applications

摘要

Doubly fed induction generators are presently used in the large majority of high power wind turbine applications. The current doubly-fed induction generator technology specifies that the turbine operates sub-synchronously to follow the desired power vs. wind speed profile and to operate super-synchronously only during brief periods where wind gusts exceed the nominal maximum value of thrust. This paper suggests that improved operation is possible if the generator is confined to always operate in the super-synchronous state resulting in improved efficiency and greater output power, and the cost effective power converter arrangement and control scheme for the super-synchronous operation are proposed and investigated in this paper.