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The main objective of this paper is to apply a MPPT strategy (Maximum Power Point Tracking) to a wind energy system based on a doubly fed induction generator (DFIG) in order to maximize the converted power and provide better integration into the electrical grid. First, a mathematical model of wind power system is performed. Then, two control strategies of the system were studied and implemented. The...
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...
The aim of this paper is to present a maximum power point tracking (MPPT) method for wind power systems. The control algorithm uses Back-stepping Control technique. This control strategy, based on electromagnetic torque, tracks the maximum power for different wind speeds. The control of our system is tested under fault condition by simulation. A few results are presented and discussed to prove simplicity,...
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 proposes a sensorless control strategy for doubly-fed induction generators (DFIGs) in variablespeed wind turbine systems (WTS). The proposed scheme uses an extended Kalman filter (EKF) for estimation of rotor speed and rotor position. Moreover, the EKF is used to estimate the mechanical torque of the generator to allow for maximum power point tracking control for wind speeds below the nominal...
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...
In this article we have studied transient system of the squirrel cage induction generator, we will establish the modeling of wind turbine and present different topologies that exist in the literature with a focus on their application in fixed speed realized with squirrel cage induction generator SCIG. We have tried to connect the SCIG directly to the grid without starting technical by circuit breaker,...
This paper presents maximum power control of doubly-fed induction generator (DFIG) based grid-connected wind energy system. The control system used a combination of MPPT method with pitch control to extract maximum power from the wind turbine. PWM hysteresis controller is used to control the back to back converter which output is connected to the utility grid through a multivariable filter. The overall...
The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated...
In the high wind speed region, in order to more effectively fulfill the power limitation control for the DFIG (Doubly-Fed Induction Generator) wind Power generation system, a constant power control strategy, with nonlinear control theory, is proposed via the pitch angle of vane and electromagnetic torque control simultaneously. The simulation results show the correctness and feasibility of the proposed...
The paper describes the design of a Doubly Fed Induction Generator (DFIG) connected to the grid through back-to-back converters in the rotor circuit. A vector control oriented with the stator voltage is applied for the grid side converter that is responsible for maintaining the DC link voltage constant regardless of the power flow between the rotor and the grid. A field orientation control with the...
This paper presents an analysis and a power coordination technique for a Doubly-Fed Induction Generator (DFIG)-based wind farm with HVDC-link integration. Control and operation of both rotor-side converter (RSC) and grid-side converter (GSC) are analyzed. The RSC control loop tracks maximum wind power and controls stator flux linkage. The GSC control loop maintains stator terminal voltage and dc-link...
This paper describes a preliminary study of a 30 kW doubly-fed induction generator (DFIG) used for wind turbine applications. Wind represents a variable-speed intermittent source of energy in nature and can be controlled to be a nearly constant speed but variable-torque input to the wind turbine using blade pitch angle regulation. Wind profile at the installation site is investigated so as to derive...
Depending on wind speed, a doubly fed induction generator (DFIG) based variable speed wind turbine is capable of operating in sub- or super-synchronous mode of operation using a back to back PWM converter. A smooth transition between these two modes of operation is necessary for reliable operations of the wind turbine under fluctuating wind. This paper presents the analysis and modeling of DFIG based...
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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