This article describes firstly a wind power production line, principally a wind turbine constitutes her and brushless doubly fed induction generator (BDFIG). The models of these components are developed, and control objective of BDFIG is to achieve a dynamic performance similar to the doubly fed induction generator (DFIG) using a stator flux field oriented control (FOC) and direct power control (DPC) strategy. After, the simulation program using Matlab/Simulink has been developed. The performances of this strategy are evaluated and analyzed, so the results shows a good robustness great dynamic and a precision of speed.
The paper presents the complete modeling and control strategy of variable speed wind turbine system (WTS) driven doubly fed induction generators (DFIG). A back-to-back converter is employed for the power conversion exchanged between DFIG and grid. The wind turbine is operated at the maximum power point tracking (MPPT) mode its maximum efficiency. Direct power control (DPC) based on selecting of the appropriate rotor voltage vectors and the errors of the active and reactive power, the control strategy of rotor side converter combines the technique of MPPT and direct power control. In the control system of the grid side converter the direct power control has been used to maintain a constant DC-Link voltage, and the reactive power is set to 0. Simulations results using MATLAB/SIMULINK are presented and discussed on a 1.5MW DFIG wind generation system demonstrate the effectiveness of the proposed control. Keyword:Back-to-back converter DFIG DPC MPPT WTS Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Senani Fawzi, Laboratoire de l'Electrotechnique de Constantine (LEC), Faculté des Sciences de la Technologie, Université des frères Mentouri de Constantine 1, Ain el-bey 25000 Constantine, Algerie. Email: senani.fouzi@gmail.com INTRODUCTIONActually, there are several sources of renewable energy, wind energy, hydropower, geothermal energy, biomass, biofuel and solar energy [1]. Wind and solar electric power generation systems are popular renewable energy resources [2]. The wind energy conversion system (WECS) has been considered to be one of the main energy resources are growing rapidly among the other renewable generation power technologies due to its freely available, clean and renewable character [3][4][5]. Wind energy conversion systems are basically divided into two fixed and variable speed.Variable speed WECS have been many advantages: operation at maximized power capture over a wide range of wind speeds, reduced mechanical stresses imposed on the turbine, and improved power quality compared with fixed speed WECS[5], [6]. The variable speed WECS using the DFIGs are suitable and promising for application in wind energy. The DFIG is particularly employed for high-power applications, due to the lower converters cost and lower power losses [7].The WECS based DFIGs control comprises both the rotor side converter (RSC) combines the technique of MPPT and grid side converter (GSC) controllers so that the RSC controls stator active and reactive powers and the GSC regulates dc-link voltage as well as generates an independent reactive power that is injected into the grid [7], [8], for RSC traditionally the vector control (VC) based on a stator flux orientation [7], [9] using proportional-integral (PI) controllers [10], However, it has some disadvantages, such as its dependence on the machine parameters variation, that its performance largely depends on the tuning of the PI parameters, must be optimally tuned to ensure the system stability within the whole operating range
In this paper, improved sonsorless direct power control (DPC) of three-phase rectifiers is presented. The new system are based on virtual flux (VF) and notch filter using Second Order Generalized Integrator frequency located loop SOGI-FLL estimator. In order to improve the VF-DPC performance of PWM rectifier, an improved observation method of virtual flux-linkage is proposed. To avoid the relevant problems of pure integrator, and to achieve the accurate observation of the grid voltage’s phase, (SOGI-FLL) are used to displace the pure integrator. Theoretical principles of this method are presented and discussed. These strategies are also investigated under disturbed grid voltage. A theoretical analysis of active and reactive power under a non-ideal source is clearly demonstrated. In order to calculate the compensated powers, the extraction of positive, negative, and harmonic sequences of voltage and current is needed and a multiple dual SOGI-FLL method is used for rapid and accurate extraction. It is shown that the VFDPC with integrating notch filter exhibits several advantages, particularly providing small ripple of DC-link voltage and sinusoidal line current when the supply voltage is not ideal.
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