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Doubly fed induction generator (DFIG) is the most popular variable-speed generator for wind energy application due to its superior performance, lower cost, and control flexibility. Instead of back-to-back converters, matrix converter (MC) can be a good alternative for connecting the DFIG rotor to the grid. This paper presents a novel lookup-table-based hysteresis controller for a variable-speed constant-frequency...
A novel sensor-less algorithm for decoupled control of torque and reactive power of a class of doubly-fed machines like the conventional wound rotor induction machine (DFIM) or the emerging brushless reluctance machine (BDFRM), has been proposed in this paper. The control concept has been derived from the first principles of torque production and magnetisation of the machines and requires only the...
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...
A novel control strategy based on the instantaneous power direct control for permanent magnet synchronous machine (PMSM) system is proposed. The control mechanism is firstly analyzed, and the influence of the instantaneous active and reactive power in torque and stator flux-linkage is explained in detail. The strategy of the direct power control by selecting the optimum voltage vector is then presented,...
This paper proposes a double-fed induction machine with a flywheel energy storage system called the multifunctional flexible power conditioner (FPC). It consists of the doubly-fed induction machine (DFIM) with very large rotating inertia and a voltage-source pulse width modulation(PWM) rectifier-inverter used as an AC exciter. A FPC 10 kW model machine is developed. A simulation model for the model...
This paper presents a current modulation scheme for matrix converter which serves as a power electronics interface in wound rotor induction generator based wind energy conversion system. It not only efficiently decouples active and reactive power of the generation system, but also gives a good grid connection performance. The proposed wind generation system is verified via simulation.
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