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This paper deals with the design of a second order sliding mode approach for a DFIG-based wind energy system subject to parameter variations and external disturbances. The design is based on a variable structure control computed from the second derivative of a properly chosen sliding manifold. The controller was augmented by a second order sliding mode observer to further improve its performance....
This paper proposes a stator flux estimation method of Doubly-Fed Induction Generator (DFIG) based on full-order sliding mode control. A nonsingular terminal sliding mode and the chattering-free control law of the observer are designed. The stator flux of the DFIG can be deduced using the observer. The proposed observer can estimate the system state with a higher precision. Further, it is insensitive...
This paper offers an improved Tip speed ratio (TSR) technique for variable speed operating mode of grid connected doubly-fed induction generator (DFIG) system. As we know from the literature, the TSR is the fastest MPPT (maximum power point tracking) technique because it uses directly the wind velocity signal to compute the optimal rotational speed of the wind turbine, However, the significant wind...
This paper presents a novel robust stator voltage oriented rotor current controller structure for grid connected doubly fed induction generators (DFIG). Controller is based on a proportional controller with first order low pass filter disturbance observer which estimates machine parameter dependent nonlinear terms. Therefore, necessity of accurate knowledge of machine parameters is not required. The...
This paper presents a comparison study and analysis of two sensorless methods for the detection of rotor position of the standalone doubly fed induction generator (DFIG). Although, there are available several sensorless control methods for DFIG, the paper deals with two popular methods. These methods are stator flux based model reference adaptive system (MRAS) observer and rotor position phase-locked-loop...
In this paper, different Model Reference Adaptive System (MRAS) based speed estimation methods are presented for a stand-alone Doubly Fed Induction Generator (DFIG) operating in the Variable Speed Constant Frequency (VSCF) mode. Among different MRAS based speed estimation techniques, stator flux based, rotor current based and reactive power based methods are compared in terms of their speed tracking...
A adaptive sliding mode observer was proposed for the speed identification of a sensor-less vector control system of doubly fed wind turbine. This strategy combines adaptive control with variable structure control, and selects the rotor currents as model outputs, and formulates a slide mode surface according current error to get speed observer expression. By using small signal model, the convergence...
This paper addresses the fault detection and isolation issue of wind turbine systems. The underlying problem is very critical to enhance the reliability, the availability and reduce the cost of maintenance of wind turbines. In this work, we use a doubly fed induction generator and a nonlinear observer is utilized to generate the residual for fault detection purpose.
An improved control scheme for sensorless vector control of grid-connected doubly fed induction generators (DFIGs) is presented when the network voltage is unbalanced. The system is based on a rotor current model reference adaptive system (MRAS) in the stator stationary reference frame. The observed rotational speed and rotor position angle are employed for the reference frame transformations of rotor...
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