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This paper presents a supplementary control of doubly-fed induction generator (DFIG) to damp the inter-area oscillation. Firstly, the small signal dynamic model of DFIG is established. Secondly, a supplementary damping controller of DFIG is investigated. Two input signals are selected, one is the tie-line power measured from the local area and the other is the voltage phase angles obtained from the...
This paper investigates the frequency control scheme of a doubly fed induction generator (DFIG)-based wind farms to provide frequency support for the power system steady operation. Due to the decoupling of the rotor speed and the grid frequency by the connected converters, the DFIG-based wind farm rarely contributes to the network effective inertia. This is particularly true in the small isolated...
A detailed computer simulation for interconnecting wind energy system to an electric utility is presented. The proposed system consists of four high rating wind turbines each one uses double fed induction generator (DFIG). Two back to back bidirectional PWM inverters are used in the rotor circuit of each DFIG to be interfaced with the electrical utility. The simulation incorporates a flexible independent...
This paper implements of a three phase grid synchronization for doubly-fed induction generators (DFIG) in wind generation system. A stator flux oriented vector is used to control the variable speed DFIG for the utility grid synchronization, active power and reactive power. Before synchronization, the stator voltage is adjusted equal to the amplitude of the grid voltage by controlling the d-axis rotor...
In this work a new strategy for controlling doubly-fed induction generator is presented. The proposed scheme has two nested control loops. The internal loop regulates the rotor flux, in opposition to the classical approach of controlling the rotor currents. The external loop controls stator currents. Since the machine is connected directly to the grid, this results in a direct control of active and...
Due to the double fed induction generatorpsilas (DFIG) advantage of controlling active and reactive power independently and partial power converter, DFIG is becoming a popular type of wind power generation system. Nowadays, the grid code demands that the wind power generator possesses the ability of riding through the grid voltage sags, only when the grid voltage drops below the specific curve, the...
This paper presents dynamic modeling and simulation of a doubly fed induction generator (DFIG) wind turbine based on space vector pulse width modulation (SVPWM) converter. SVPWM is applied to partial scale power electronic converters as grid side and rotor side converter. All power and control units are performed in PSCAD/EMTDC software. Dynamic response in grid connected mode for variable speed wind...
This paper proposes an active power control method for Doubly-Fed Induction Generator (DFIG) to convert wind power to electric power of constant frequency current with unity power factor. Instead of using conventional transformation between a-b-c frame and d-q frame, the proposed method independently adjusts the magnitude and phase of the stator output. The achieved response characteristic of the...
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