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This paper deals with a protection and control strategy to enhance the low voltage ride through capability of a wind turbine driven doubly fed induction generator (DFIG). As the wind power penetration continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability. Crowbars are commonly used to protect the power converters during voltage dips and their main...
Variable speed doubly fed induction generators (DFIG) are preferred in wind generation systems because they offer several advantages in terms of control and aerodynamic efficiency. While it is generally a stable machine, its converter systems may not work properly under severe grid fault conditions. This article presents a strategy of riding through the low voltage conditions through control of superconducting...
In this paper, the authors present a discrete-time adaptive neural backstepping control for a doubly fed induction generator (DFIG), based on a discrete-time high order neural network (HONN), which is trained with a new particle swarm optimization extended Kalman filter (PSOEKF) algorithm. The discrete-time adaptive neural backstepping control performance is illustrated via simulations.
The aim of this paper is to explore the various dynamic controllers to enhance the fault ride-through (FRT) of doubly-fed induction generators (DFIGs). A wind farm of total capacity 9 MW is considered for the study. The flexible AC transmission system (FACTS) controllers like Static Synchronous Compensators (STATCOM) and Unified Power Flow Controllers (UPFC) are modelled and analysed to study their...
Voltage fluctuation of grid connected wind turbines (WTs) raises certain restriction for wind power penetration levels. In this paper, a flicker mitigation algorithm is proposed for doubly fed induction generator (DFIG) based WTs. The mitigation algorithm is based on tuning the DFIG power factor according to the equivalent grid impedance seen at the point of common coupling. The proposed algorithm...
Different structure and control algorithm can be used for control of power converter. One of the most common control techniques is decouple proportionate integral (PI) control of output active and reactive power to improve dynamic behavior of wind turbine. In this paper, a new current controlled voltage source converter (CC-VSC) scheme is proposed to control both the rotor and grid side converters...
In this paper, a full (expanded) model of basic components of a 2.5 MW doubly fed induction generator (DFIG) based wind turbine will be described. This model includes mechanical components like wind turbines rotor, shaft and gear box; and electrical components such as DFIG and active and reactive power controller systems. After that, a new fast model of DFIG based wind turbine will be developed based...
The paper presents the multi-objective optimization control strategy of a doubly fed induction generator (DFIG) under the distorted grid voltage conditions. Based on the mathematical model of DFIG in the positive synchronous reference frame under the distorted grid voltage conditions, the four different control targets are proposed to restrain the harmonic components in stator/rotor current or the...
This paper presents the design of a Linear Quadratic Regulator (LQR) with Integral action (LQRI) applied to a wind energy conversion system (WECS) based on doubly fed induction generator (DFIG). The controller is used to achieve speed regulation for maximum power extraction from the wind turbine, DC bus voltage regulation, to make the machine draw its magnetizing current only from the stator and to...
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,...
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...
Due to growing power demand and environmental concerns, electrical power generation from renewable is receiving more attention. Wind energy generation systems are being connected in increasing numbers to power systems worldwide. DFIG has remained as promising research area for many researchers due to many reasons. This paper presents a critical survey on grid integration issues of DFIG based wind...
This paper presents the findings of investigation of decoupled power control of grid-connected doubly fed induction generator (DFIG) based on Adaptive Back Stepping Control (ABSC) technique. The Adaptive Back Stepping control technique offers a systematic stabilizing procedure wherein unwanted cancellation of favourable nonlinearities can be avoided. Incorporation of the proposed controller improves...
The current paper presents a technique to localize errors in the Doubly Fed Induction Generator (DFIG) of a Wind Turbine (WT). The method is based on the use of a Generalized Observer Scheme (GOS). It is validated using a numeric simulator, then a real benchmark emulating a wind turbine.
An analytical method of calculating an optimal resistance for crowbar of doubly fed induction generator (DFIG) under single phase fault is proposed by taking into account the impact of crowbar on reactive power, rotor current, voltage and electrical torque respectively. Finding the optimal resistance value for the crowbar is based on Analytic Hierarchy Process (AHP) in this paper, of the DFIG during...
Due to penetration of Double Fed Induction Generators in power systems and demand of the new grid code to remain connected during the fault, critical clearance time (CCT) and critical speed (CS) become very important. In this paper CCT and CS are obtained theoretically and compared with the simulation result.
In the case of doubly fed induction generator (DFIG), power electronics converter effectively decouples the inertia of the wind turbine generator from the power system. Hence, the increased penetration of DFIG results in higher frequency excursion and increased rate of change of frequency in the event of generation loss or increased load demand. This paper presents the added feature of frequency regulation...
In this paper, a new approach for modeling and control of reactive power in microgrid is presented. This structure utilizes wind turbine driven doubly fed induction generator (DFIG). Firstly, the dynamics of voltage and reactive power of DFIG and synchronous generator are represented via a model. After that, a control system is designed for the microgrid reactive power. This control strategy is used...
This paper presents a new method for increasing the doubly fed induction generator (DFIG) performance under fault conditions. After the fault takes place, the rotor current increases to more than 8 times the nominal value, so the protective resistors called crowbar (Cb) will be switched on, and the current will be restricted. In order to stop injuring the rotor side convertor (RSC), the control signals...
This paper, investigates the effect of High Impedance Fault (HIF) on wind turbine equipped with Doubly Fed Induction Generator (DFIG) operation. Consequently, a new proposed method is used to HIF detecting in power system connected to wind farm equipped with DFIGs means of harmonic component analyzing of DFIG rotor current. The simulation has been done with PSCAD/EMTDC software.
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