Abstract
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 effects 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 effectiveness 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.
Highlights
IntroductionThe use of hybrid distributed energy resources (DERs) is at a level of importance to meet the demand side
Power system oscillations are due to the absence of damping torques
We develop a load frequency controller to reduce the deviations of the rotor speed of synchronous machines in power systems connected to wind energy conversion (WEC) system due to wind energy penetration and fluctuations
Summary
The use of hybrid distributed energy resources (DERs) is at a level of importance to meet the demand side. This problem is a real challenge in wind energy conversion (WEC) systems due to the fluctuations of the wind, which can change the power system inertia [1,2,3]. Wind energy has an intermittent nature, which can affect the generation/load profile [4]. That results in rotor oscillations of synchronous machines and causes oscillation in other power system variables such as frequency, voltage, transmission line power, etc. Interconnected power system frequency digression is within the range of 0.1 to 2 Hz [5]
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