Abstract

Modeling and control of Type 3 and Type 4 wind turbines are introduced in this chapter. Both of these wind energy conversion systems are known as variable-speed wind turbines. The Type 3 version, also known as the doubly fed induction generator (DFIG)-based technology, consists of a wind turbine, induction generator, and two partially rated back-to-back voltage source converters (VSCs). The modeling of turbine and induction generator are first presented. The tie-reactances of the VSCs are also integrated in the model. This is followed by the description of converter controls. Both grid-connected mode and isolated mode of controls are elaborated. Finally, the modeling and control of a Type 4 wind turbine based on permanent magnet synchronous generator and full-converter system are discussed.

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