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Because of increasing generation of electricity from non-conventional sources all over the world including India, there is heavy demand for Doubly Fed Induction Generator (DFIG) as it possess several merits over other conventional generators. This papers presents a literature review for control of DFIG based wind energy conversion systems under unbalanced grid voltage conditions. Various techniques...
This work presents the control of active and reactive power, regardless, of DFIG (Double Field Induction Generator) typically used in electrical energy production and particularly in wind turbines. The machine is connected to a public network and operates as a generator. Its rotor is powered by a voltage of two-level inverter. We offer the control of the DFIG by two strategies, the first is based...
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 both the previously and newly modified Stator Flux Oriented Control (SFOC) and Direct Power Control (DPC) structures for Doubly Fed Induction Generator (DFIG) in wind turbines to improve responses of active power, reactive power and generator's torque during the grid voltage unbalance. In the newly proposed SFOC-based scheme, which emphasizes on improvement of generator's torque...
This paper proposes a new direct power control (DPC) strategy of doubly-fed induction generator (DFIG) using matrix converters (MCs). In this method many advantages of MC such as lack of bulky dc-link capacitor are used and also grid side converter controller is emitted. Due to higher number of output voltage vectors in MCs in comparison with VSIs, input power factor of MC (grid side) is controlled...
In this paper a novel method for controlling DFIG based wind turbine is proposed in order to compensate the most prominent harmonics of the utility grid in addition with providing required network active and reactive power. This harmonics elimination provide better power quality and power capturing of wind energy fluctuating wind speed concurrently. Direct power control (DPC) is applied to control...
in this paper a new Direct Power Control method of the Doubly Fed Induction Machine without the use of rotor position sensors is presented. The method is based on estimating the stator flux in the rotor reference frame, and then applying the correct rotor voltages to obtain the desired rotor flux and power. Estimation of the rotor position is done by comparing the measured values with the estimated...
The use of the Doubly-fed Induction Generator (DFIG) in large wind turbines is growing rapidly, the wind farms are today required to participate actively in grid operation by an appropriate generation control. The study focuses on the direct power control (DPC) of the DFIG active and reactive powers (DPC) using the so-called sliding mode control (SMC). A model has been developed, including the mechanical,...
This paper presents a synthesis of a switching table by means of sliding mode theory for a direct power control (DPC) of electrical systems. It is applied to the control of a variable speed wind system based on a doubly fed induction generator (DFIG). Control of active and reactive stator power exchanged with the grid is achieved by delivering to rotor side converter (RsC) references voltage rotor...
The original direct power control (DPC) is known to give a fast response under transient conditions. However, active power, reactive power and current pulsations occur in steady-state operation. A family of variable structure controllers for the doubly fed induction generator (DFIG)-based wind turbine system is presented, using the principles of an active and reactive power controller known as modified...
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