Utilizing Active Rotor-Current References for Smooth Grid Connection of a DFIG-Based Wind-Power System

Ali, Muhammad Arif Sharafat

doi:10.4316/aece.2020.04011

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…Stator voltage-oriented control and stator flux-oriented control (SFOC) are two prominent types of FOC, and they exhibit the same dynamic performance. However, few published studies explain the startup and synchronization process of a DFIG-based WECS with the grid [7,8,10,[15][16][17][18][19][20][21]. The authors of [7] presented an efficient control scheme for the grid synchronization of a DFIG.…”

Section: Literature Reviewmentioning

confidence: 99%

“…To realize a smooth grid connection, the authors of [8] proposed state feedback controllers to circumvent the drawbacks of proportionalintegral (PI) controllers. The authors of [10,15] suggested grid synchronization based on the appropriate control of rotor direct and quadrature currents. However, the absence of voltage feedback resulted in substantial variations between the stator and grid voltages, which were also significantly influenced by the established grid connection.…”

Section: Literature Reviewmentioning

confidence: 99%

“…This occurs when the absolute-zero position of the rotor encoder does not match with the zero-location of the rotor windings. These errors are related to the q-axis component of stator voltage [13,15]. In terms of the performance of the proposed control scheme, it was capable of minimizing such errors; hence, two different values of q-axis stator-voltage component were noticed.…”

Section: Control Performance Under Balanced Grid Conditionsmentioning

confidence: 99%

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LMI-Based State Feedback Control Structure for Resolving Grid Connectivity Issues in DFIG-Based WT Systems

Ali¹

2021

Eng

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Pertaining to the connectivity issues in wind power plants with grids, this study introduces an efficient mechanism based on a state feedback control structure to establish a fast and stable grid connection for a wind-driven doubly-fed induction generator (DFIG). Owing to a direct link through stator windings, a DFIG is significantly vulnerable to grid disturbances and experiences sizable inrush currents when connected to the power grid. The proposed control structure is designed based on a linear matrix inequality stabilization criterion, which is framed using a suitable Lyapunov candidate function. The control objective is to ensure that the stator voltage can exponentially converge to the grid voltage, accounting for balanced and unbalanced grid conditions. This is achieved by generating appropriate rotor voltage references for rotor-side converter control. This study also explores the capability of the proposed control structure to enhance the system’s robustness to external disturbances and uncertain parametric variations. Simulations confirmed the effectiveness and suitability of the developed structure in mitigating the adverse effects of the rapid onset of the grid voltage at the stator terminals of the DFIG under various grid conditions; the proposed structure could thus establish a reliable connection with negligible effects on the DFIG and the grid.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Control Performance Under Balanced Grid Conditionsmentioning

confidence: 99%

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LMI-Based State Feedback Control Structure for Resolving Grid Connectivity Issues in DFIG-Based WT Systems

Ali¹

2021

Eng

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“…Among all designs of variable-speed wind turbines, two commercial leading designs are presented on a big scale; synchronous generator SG and wind turbine-based doubly-fed induction generators (DFIG). Without doubt, the DFIG technology has won over other ones; this is due to its cost, reliability, robustness and small requirements of its power converters [3], [13], [14]. DFIG is a three phase asynchronous electric machine with open rotor windings that can be fed by external voltages [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Modeling of wind turbine based on dual DFIG generators

Mahroug

Matallah

Abudura

2022

IJPEDS

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In order to investigate a viable approach to fully exploit the wind speed, the present work investigates the application of a novel wind turbine consisting of dual doubly-fed induction generators (DFIG). The model can be further used to apply in areas where the winds are high to achieve high conversion efficiency in order to produce large electric power and increase the wind turbine capacity with an economy of hardware on the one hand, and to reduce the installation cost on the other. Furthermore, this model is always guarantees the continuity of power production because if one generator fails, the second generator will keep working until the broken one is repaired. The proposed model of the wind turbine based on dual doubly-fed induction generators (WT-dual-DFIG) were using the indirect field-oriented control (IFOC) was validated by wind turbine based on single doubly-fed induction generator (WT-single-DFIG) in MATLAB/Simulink. The results of simulation show that the simulated responses of the WT-dual-DFIG increased the power by a factor of about 14.3% compared to a WT-single-DFIG due to the use of a variable speed dual-DFIG. Finally, we can say that the WT-dual-DFIG model is strongly developed and could be applied in the coming years.

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“…Among all variable-speed wind turbine designs, two commercial leading technologies are introduced in extensive scale; wind turbine based DFIG and synchronous generator (SG). Indeed, DFIG technology has overtaken other ones because of its cost, robustness, reliability and small power converters requirements [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements

Noussi¹,

Abouloifa²,

Katir³

et al. 2021

IJPEDS

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This article addresses the problem of controlling an overall wind energy conversion system (WECS) formed by a wind turbine connected to the grid via a doubly fed introduction generator (DFIG) and an AC/DC/AC converter. The main control objectives are fourfold: (i) designing an output feedback speed controller that makes the DFIG rotate at the optimal value delivered by the MPPT strategy, (ii) controlling the stator reactive power so as to be null, (iii) guaranteeing the DC-link voltage in the grid side converter to be at a given constant value, (iv) ensuring a unitary power factor. A high gain observer is synthesized, in order to provide estimated values of the mechanical variables. To achieve the control objectives, a sliding mode controller involving the mechanical observer is designed. The performance of the system configuration based on the 2MW-DFIG with the proposed controller is evaluated by a numerical simulation under a realistic wind profile using MATLAB/SIMULINK/SimPowerSystems environment.

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Utilizing Active Rotor-Current References for Smooth Grid Connection of a DFIG-Based Wind-Power System

Cited by 9 publications

References 15 publications

LMI-Based State Feedback Control Structure for Resolving Grid Connectivity Issues in DFIG-Based WT Systems

LMI-Based State Feedback Control Structure for Resolving Grid Connectivity Issues in DFIG-Based WT Systems

Modeling of wind turbine based on dual DFIG generators

Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements

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