The main purpose of this paper is to enhance the operation of renewable wind energy
conversion (WEC) systems connected to power systems. To achieve this, we consider a linear
quadratic Gaussian (LQG) control approach for regulating the eects of a WEC system with doubly
fed induction generator (DFIG) on the synchronous generator (SG) rotor speed of the interconnected
power system. First, we present the mathematical formulation of the interconnected power system
comprises a single synchronous generator and a wind turbine with DFIG connected to an infinite
bus bar system through a transmission line. We consider that the system is operated under various
loading conditions and parameters variation. Second, a frequency damping oscillation observer is
designed via Kalman filtering together with an optimal linear quadratic regulator to mitigate the
impacts of the WEC system on the SG rotor speed. The performance of the developed interconnected
power system is simulated using a MATLAB/SIMULINK environment to verify the eectiveness of
the developed controller. In comparison with previously reported results, the proposed approach can
stabilize the interconnected power system within 1.28 s compared to 1.3 s without the DFIG.