Abstract
In this study, an auxiliary damping controller based on a robust controller considering the active and reactive power control loops for a doubly-fed induction generator for wind farms is proposed. The presented controller is able to improve the inter-area oscillation damping. In addition, the proposed controller applies only one accessible local signal as the input; however, it can improve the inter-area oscillation damping and, consequently the system stability for the various working conditions and uncertainties. The oscillatory modes of the system are appointed using the linear analysis. Then, the controller’s parameters are determined using the robust control approaches ({H}_{infty }/{H}_{2}) with the pole placement and linear matrix inequality method. The results of the modal analysis and time-domain simulations confirm that the controller develops the inter-area oscillation damping under the various working conditions and uncertainties.
Highlights
The increasing development of the wind energy-based applications imposes new challenges on the stability and performance of the power systems
The results indicate that the proposed controller reduces both the electromechanical oscillations of the power system and the torsional oscillations
An auxiliary controller for doubly-fed induction generators (DFIGs) based on robust control was designed based on the H2∕H∞ hybrid control method
Summary
The increasing development of the wind energy-based applications imposes new challenges on the stability and performance of the power systems. Most of the electromechanical oscillations arise from the synchronous machines [2]. These oscillations result from the interaction between the turbine-to-rotor mechanical torque and the stator-to-rotor electrical torque. One generator may oscillate dissimilarly toward the other ones. This oscillation affects both the generator and the transmission line. The neighboring groups of generators may oscillate in different manners. It is because of the fact that there is a low power-transmission capability between the groups of generators
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