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This paper treats the control of wind energy conversion systems (WECS) based on a Takagi-Sugeno (T-S) model combined with the H∞ performance. This control strategy proposes a new stabilization condition to the LMI formulation, which gives us the best conservative stabilization conditions published recently in the literature for the fuzzy observer and H∞ controller designs, where the H∞ performance...
This paper presents a grid-connected Wind Energy Conversion System (WECS) using a permanent magnet synchronous generator (PMSG) operating with variable speed. A maximum power point tracking (MPPT) algorithm is used to determinate the power to be extracted from the generator for each rotational speed while wind power remains lower than the PSMG rated power. Otherwise, the MPPT algorithm is disabled...
Many innovations has been done for optimal utilization of various energy resources, nowadays many limitations are increasing on non-renewables due to their depletion and adverse environmental effects. Wind is one of the most important inexhaustible sources. As technologies are advancing, efficient use of wind like resources is also increasing. Doubly-fed Induction Generator (DFIG) based system is...
This work develops a high nonlinear method based active and reactive decoupled current controller for a variable speed and fixed pitch wind energy conversion system (WECS) with an doubly fed induction generator (DFIG). The control objective is to maximize the total active power delivered by the system at the meanwhile regulate the reactive power injected by the voltage oriented controlled (VOC) converters...
This paper describes an effective nonlinear controller with a systematic design procedure to capture the maximum power from variable speed wind turbine. The nonlinear wind energy conversion system (WECS) is described by the Takagi-sugeno (T-S) fuzzy model using local linear dynamic state space models. The goal is to design local PI controllers on the basic of these linear models. The overall controller...
The growth of wind electric energy production during the last years shows a promising market for this renewable energy resource. Some aspects of it are well consolidated and there is little room to change the industry. However, further improvement is seen as the semiconductors technology and magnetic materials advance. In this context, this work presents a high efficiency wind energy conversion system...
This paper proposes a control scheme for a wind turbine using a DFIG electromechanical converter, implemented through an NPC three-level back to back converter, that keeps a unitary power factor injection to the grid and maximizes the energy harvested from wind, using a maximum power point tracking algorithm (MPPT). A predictive direct power control (DPC) strategy drives the grid-side converter, to...
This paper presents the performance study of a speed sensor-less control of grid connected DFIG based variable speed Wind Energy Conversion System (WECS). A new phase locked loop (PLL) based slip speed estimator using rotor current is proposed for speed sensor-less stator field oriented vector control operation of rotor side converter (RSC) to ensure decoupled control of stator active and reactive...
In this paper we present a new sensorless control for Wind Energy Conversion System (WECS) based on Doubly Fed Twin Stator Induction Generator (DFTSIG). The aim of this control is to extract the maximum wind power and to control the power generation only by measuring phase voltages and currents. The proposed control scheme is ensured without the need of using any rotor speed or wind sensors from the...
This paper presents a control method for output power smoothing of a wind energy conversion system (WECS) with a permanent magnet synchronous generator (PMSG) using the inertia of wind turbine and pitch control. The WECS used in this paper adopts an AC-DC-AC method with voltage-source converters (VSC). The generator-side converter controls the generator torque of the PMSG, while the grid-side inverter...
A multivariable control strategy based on model predictive control techniques for the control of variable speed variable pitch wind turbines is proposed. The proposed control strategy is described for the whole operating region of the wind turbine (both partial and full load regimes). Pitch angle and generator torque are controlled simultaneously to maximize energy capture, mitigate drive train transient...
This paper presents an artificial neural network (ANN) observer for a speed sensorless permanent magnet synchronous generator (PMSG) in wind energy conversion system (WECS). In order to perform maximum power point tracking control of the wind generation system, it is necessary to drive wind turbine at an optimal rotor speed. From the aspect of reliability and increase in cost, wind velocity sensor...
With increased structural flexibilities of modern wind energy conversion systems (WECSs), drive-train torsional oscillations due to high wind disturbances can be hazardous to power systems. It is particularly important to design control schemes that properly account for the flexible modes of the turbine, and maintain stable closed-loop behavior of the WECS. To capture the essential features of the...
Based on the prototype of wind electricity conversion system (WECS), this paper presents a self-adaptive control strategy for doubly fed induction generators (DFIG) applied to variable speed constant frequency wind generation system. The strategy mainly depends on wind speed estimation, the wind turbine and generator parameters. Wind speed is estimated by the output power and the efficiency of the...
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