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A new indirect power control strategy using modelbased predictive current control (MB-PCC) is presented in this paper for a doubly fed induction generator (DFIG) driven by an indirect matrix converter suitable for wind energy systems. In this paper the power reference is used to develop a new expression for the stator current in terms of the rotor current. A step by step methodology is presented to...
This paper deals with sensorless constant v/f closed loop control of high-power induction motor with synchronized space vector pulse width modulation (SVPWM). The rotor speed is estimated based on the difference between the rotor flux speed expressed in stationary reference frame and slip speed. The estimated stator flux and the synchronous speed are used to generate the estimated back EMF. The difference...
A novel predictive rotor current control scheme for a doubly fed induction generator (DFIG) is implemented to perform the DFIG grid synchronization with a fast dynamic response. With this control strategy applied to an experimental setup, the rotor currents swiftly follow the necessary reference for grid synchronization in the range ±30% of the generator rated shaft speed. The DFIG and converter discrete...
The dynamic performance of Doubly-Fed Induction Generator (DFIG) before and after connection is analyzed based on corresponding mathematical models and transfer functions in decoupled vector control. The parameter tuning methods of rotor current regulator before and after connection are given. To reach same dynamic performance the parameters should take different values and be switched before and...
This paper presents a model based predictive direct power control (MPDPC) strategy to achieve soft and fast grid synchronization of doubly fed induction generator (DFIG) applied in wind energy applications. The future behavior of active and reactive powers is predicted in MPDPC using the discrete model of DFIG and the most appropriate voltage vector is selected to minimize the errors between the reference...
In this paper, a topology for a grid connected generation system based on two doubly fed induction machines is presented. The proposed scheme is implemented using an indirect matrix converter consisting of an input stage and two output stages. The input stage is connected to the grid and provides the required DC voltage for both output stages. Each of the output stages is connected to the rotor of...
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...
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