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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,...
To ensure safe and reliable operation of power system based on wind energy, usually plant operators should satisfy grid code requirements such as grid stability, fault ride through (FRT), power quality improvement, grid synchronization and power control etc. To satisfy the grid code requirements of wind turbine, usually grid side converter is playing a major role. So in order to improve the operation...
This paper presents implementation of Feedback Linearization based control (FBLC) for the smooth connection of the doubly fed induction generator to the power grid and for the power control of the grid connected doubly fed induction generator. The induced stator voltage vector of the DFIG is synchronized with the grid voltage irrespective of the accuracy of signal from position encoder. Computer simulation...
With wind as a source of power, induction generators for remote and windy areas are suitable. Especially for remote areas where wind is available in bulk, small scale wind farms are suitable for which a complete set up is analyzed in this paper. The rotor windings are energized through a 3 phase AC of low frequency and the stator supplies 3 phase AC to the load. The method of pitch control is employed...
The fast development of wind power generation brings new necessary requirement for wind turbine to provide Low Voltage Ride-Through (LVRT) capability. The paper introduces the models of Doubly Fed Induction Generator (DFIG), converter and rotor active crowbar, and analyses characteristics of DFIG system with rotor active crowbar during grid voltage dip. A novel turn-on and turn-off control method...
This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
We present in this paper the modeling and control designs for a variable-speed constant-frequency wind energy conversion system using double fed induction generator. The aim of this paper is to develop a nonlinear vector control strategy using the second Lyapunov approach for the rotor side converter and a network voltage vector oriented control of the grid side converter and to maximize the energy...
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...
In this paper, Optimal design basis of dual winding induction generator for minimizing to reactive power of control winding with converter under variable speed are proposed. A optimal prototype is presented. The experiment results based on dSPACE show the capacitance ratio between control winding and power winding is very small with 2:1 speed variable range, which is help to minish capacitance of...
With the development of modern wind energy generation, higher requirements to the grid in case of a failure were raised. In order to faciliate the recovery of power, while voltage dips in a certain range, protecting the rotor side converter and providing reactive power to the grid are both needed according to the requirements. This paper takes DFIG for example, in order to protect the rotor side converter,...
This paper Investigates the performance of direct power control strategies both steady state and transient applied to doubly fed induction generator (DFIG). These methods directly track stator active and reactive power variations within a fixed sampling period. Simulations are performed using detailed models in Simulink/Matlab. Transient performance and steady state operation of the DFIG are illustrated.
This paper presents a new direct torque control (DTC) method for doubly-fed induction generator (DFIG) based wind power generation system. The angle and magnitude of rotor voltage are controlled to achieve independent control of electromagnetic torque and reactive power respectively. Space vector modulation (SVM) is used to address the limitations, of variable switching frequency and torque ripple,...
Doubly Fed Induction Generators (DFIG) has emerged as a suitable alternative for conversion of wind energy to grid quality energy under varying wind conditions. Often the control mechanism use large number of sensors and employ complex computations. Moreover, the reported control schemes for DFIG employing grid side converter (GSC) do not ensure a drawl of unity power factor (upf) sinusoidal current...
New regulatory requirements outlined in the European Grid Code dictate fault ride-through and reactive power support requirements for wind energy conversion systems. This paper introduces a simple emergency control scheme for DFIG-based wind turbines to comply with the grid code requirements. The proposed control design uses an enhanced phase locked loop (PLL) system to extract the synchronization...
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...
The rate at which large variable speed wind farms are being developed had increased rapidly as the demand for green energy has grown. With this increase in distributed energy penetration into power networks, the main focus must be on power quality (Voltage Quality and Supply Reliability). However, new grid codes require wind energy generating systems to ride through grid faults, and at the same time...
This paper presents a quantitative analysis of the advantages of a grid connected doubly fed induction generator (DFIG) for wind energy conversion systems (WECS) over the other available variable speed WECS. The WEC system includes back-to-back connected PWM voltage source converters (VSC) in the rotor circuit of the DFIG. The control strategy implemented is - unity power factor operation of the machine...
This paper deals with the analysis, modeling, and control of a doubly-fed induction generator (DFIG) driven by the wind turbine. A control technique is presented for extracting the maximum power from the wind turbine. The wind energy conversion system (WECS) is equipped with a DFIG and two back-to-back connected voltage source converters (VSCs) in the rotor circuit. The proposed control technique...
This paper presents the modeling and simulation of wind power systems based on two different induction generators; the squirrel-cage induction generator (SCIG) and the doubly-fed induction generator (DFIG). The techniques of direct grid integration of SCIG system and independent power control of DFIG system are discussed. Particularly, to solve the droop in distribution line voltage in SCIG system,...
This paper studies the impacts of grid voltage swell on the dc-link voltage for doubly fed induction generator (DFIG). A flexible algorithm of the dc-link voltage is proposed to meet the requirements of wide variation in grid voltage. The dc-link voltage reference is regulated with the variation of grid voltage. Thus, the dc-link voltage is maintained to a constant during normal operation but a relatively...
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