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An induction generator (IG) speed drive with the application of a sliding mode controller and a proposed recursive least square (RLS) estimator is introduced in this paper. The rotor inertia constant, friction constant, and the disturbed mechanical torque of the IG are estimated by the proposed RLS estimator, which is composed of the RLS algorithm and a torque observer. The integral proportional (IP)...
Renewable energy sources have focused a special attention in wind energy conversion systems, where the goal is maximal power extraction. This paper presents an evaluation of the linear controllers eigen structure assignment, linear quadratic regulator, and the robust loop shaping design procedure actuating on a small wind energy conversion system with a permanent magnet synchronous generator, the...
Variable speed wind generation systems are more attractive than fixed-speed systems because of the more efficient energy production improved power quality, and improved dynamic performance during grid disturbances. In this sense, to implement maximum wind power extraction, most controller designs of the variable-speed wind turbine generators employ anemometers to measure wind speed in order to derive...
This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this paper proposes an improved MPPT control methods, which can achieves more quickly and effectively tracking the maximum power. Finally, the effectiveness...
Variable speed operation of wind turbines is conducted by torque control below rated wind speed. Variable speed wind turbines could lead to extract maximum power, which is the main objective of torque control, from the potential aerodynamic power of the wind. Torque control methods of wind turbines are classified into two cases; torque mode control and speed mode control. In this paper, simulation...
This paper develops a framework of maximum power point tracking (MPPT) of doubly-fed induction generator (DFIG) based and permanent magnet synchronous generator (PMSG) based wind energy systems. The principles of MPPT in various wind generators are firstly investigated and feedback control schemes to realize MPPT with/without wind speed measurements are presented. Stability analysis of the wind energy...
A new approach to design LPV robust gain scheduling controllers for a variable pitch variable speed wind turbine drive system is presented. The time-varying nonlinear model of the wind turbine is translated into a linear parameter varying (LPV) system with convex polyhedron version via the LPV convex decomposition technique. State feedback controller satisfying Hinfin performance at every vertex of...
Grid connected wind energy conversion systems (WECS) present interesting control demands, due to the intrinsic nonlinear characteristics of windmills and electric generators. In this paper a predictive control strategy for doubly fed induction machine is proposed. The doubly fed induction machine is used in generating mode for large-scale grid-connected variable speed wind turbines. In order to control...
The control systems proposed for a variable speed wind turbines becomes nowadays more and more complicated. The modern horizontal axis wind turbine (HAVT) consists of wind rotor and variable speed generator controlled via power inverter. The article deals with novel wind turbine controller structure dedicated for a variable speed operation. The stability investigation of proposed controller with integrated...
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