Optimal Linear-Quadratic-Integral Controller Design for Doubly-Fed Induction Generator

This paper presents an optimal linear quadratic integral control scheme for doubly fed induction generator. It is based on linear quadratic regulator approach augmented by, adding integral action to track the steady state reference. A multiple input multiple output state space model is developed for current control of rotor side converter and grid side converter using stator flux orientation and grid voltage orientation respectively. The proposed method is also used to develop a speed control of the rotor by controlling the stator active power. The advantages of the proposed control over existing control architecture have been shown in transient as well as steady state condition.