Control strategy research of Doubly-fed induction wind generators based on novel reactive power optimization control

As the most widely used wind turbine generating system, the Doubly-fed induction generators, whose output characteristics is worth studying in depth when connected to the grid. In order to study output characteristics of Doubly-fed wind turbines, simulate the response characteristics of the units´ main parameters under different wind conditions with the aid of Bladed software. The establishment of linear model which includes wind wheel, drive chain and electrical linear model seeks to obtain linear model of Doubly-fed wind turbines. Then we can obtain transfer function between pitch angle and the reactive power of rotor side using the resulting linear model. Take advantage of Matlab simulation software to build a simulation platform. Moreover, we finally obtain a good rotor reactive response by designing PI controller.