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The aim of this paper is to develop a doubly-fed induction generator (DFIG) wind turbine model suitable for the simulation of this generator in the healthy mode and faulty mode. The dynamic model of a DFIG with rotor and stator inter-turn short circuit fault is proposed. A model (abc) is developed, which can represent both the healthy and faulty conditions. The DFIG is directly connected to the grid...
Much attention has been paid to Virtual Synchronous Control (VSynC) strategy for Doubly-Fed Induction Generator (DFIG) due to its advantage in providing dynamic supports of frequency and voltage. However, current researches of VSynC strategy focus on analysis of its electromechanical behaviors, and neglect its electromagnetic transient responses and fault characteristics, hindering its application...
Doubly-Fed Induction Generator (DFIG) Wind Turbine (WT) is rather sensitive to power system faults and requires specific power converter protection, namely a crowbar. When the crowbar is triggered, the rotor is short circuited over the crowbar impedance, the rotor-side converter (RSC) is incapacitated and therefore the DFIG operates as a squirrel-cage induction generator (SCIG) that tends to drain...
Negative impacts! of the grid faults! in the Doubly Fed Induction Generators (DFIGs) based wind turbines systems include the stator and rotor over currents, DC-link over voltage, electromagnetic torque oscillations, active and reactive power fluctuations at the grid connection point, potentially leading to destabilization of the power system network. For eliminating of the negative impacts, thus enhances...
This paper proposes a control strategy to improve the high voltage ride-through (HVRT) capability of doubly fed induction generator (DFIG)-based wind turbines in the event of a grid voltage symmetrical swell fault. The proposed solution is performed by an efficient control of a series grid side converter (SGSC), which suppresses the transient DC component of the stator flux. Thereby, the overvoltage...
Variable-speed turbines have gained increasing importance in pumped-storage power plants since they present big advantages compared to the classical topology with a synchronous generator. Within the variable-speed solutions, the one employing a doubly-fed induction generator (DFIG) has become the preferred alternative for large installations since it provides the advantages of variable-speed operation...
This paper presents a detailed analysis of the dynamic behavior of Doubly Fed Induction Generator (DFIG) under asymmetrical voltage dips. Finite element analysis (FEA)for 1.5MW DFIG, back-to-back converter, DC-Link, step up transformer, voltage sag generator(VSG) and the control algorithm have been considered and coupled together by using a coupled simulation. The effect of asymmetrical voltage dips...
Recent developments show that renewable energy sources are considerably contributing to the electrical power generation and offer a future-oriented, sustainable and environmental-friendly alternative to fossil energy sources. Wind energy in particular has experienced a rapid growth over the past decades, so that wind energy conversion systems (WECS) will occupy an important role in the power generation...
This paper deals with the enhancement of the transient stability of the power system integrated with Doubly Fed Induction Generator (DFIG) based wind farms connected with Superconducting Magnetic Energy Storage (SMES) unit. The fluctuation in the wind power injection to the system due to variability in wind speed can also be reduced by the introduction of the SMES unit. The study is carried out in...
Variable-speed wind turbine (VST) with doubly-fed induction generator (DFIG) is one type of wind power that capable of producing electrical energy efficiently, capable of controlling real and reactive power generator, and improves the power quality. However, DFIG wind turbine has a variable-frequency AC / DC / AC converter (VFC) and IGBT switches that very sensitive to overcurrent which occur during...
Induction machines are widely used in different applications. Unpredicted breakdown of these machines usually leads to costly downtime and repairs. These expenses can be minimized by using proper condition monitoring techniques. Eccentricity fault is one of the widespread faults causing machine malfunction; its detection could be useful for preventing of harmful consequences. In this paper, different...
Variable-speed turbines have gained increasing importance in pump-storage power stations since they present big advantages compared to the classical topology with a synchronous generator. Within the variable-speed solutions, the one employing a doubly-fed induction generator (DFIG) has become the preferred solution for large installations since it provides the advantages of variable-speed operation...
When a non-bolted-three-phase-fault occurs in the outgoing transmission line from a DFIG-based wind farm with low-voltage-ride-through (LVRT) capability, the wind power side bus voltage and short-circuit current may have inconsistent main frequencies. This paper is devoted to exploring the reason theoretically. Based on the fundamental of induction generators, a simplified three-order dynamic model...
In this paper, the wind energy conversion system that uses the “Cascade technology” especially the structure of Doubly-Fed Induction Generator (DFIG) is presented and analyzed. Moreover, a simulation of this wind energy conversion system in MATLAB/SIMULINK under different wind speeds is done and the results are presented and evaluated. Furthermore, a simulation under faulty conditions is held. More...
Wind farms WF connected to the power network are frequently subjected to grid faults, a large rotor current rising proportion happens during grid voltage sags. These faults may cause damages to rotor windings, converters, DC Link capacitor or induce drive train mechanical stress due to torque fluctuations. This paper develops a crowbar and chopper protection strategy to care for doubly fed induction...
This paper presents a novel DFIG system with split rotor winding DFIG generator, and with a particular control strategy to offer fault ride through capability. Based on the traditional DFIG model, the simplified equivalent circuit of the DFIG with split rotor winding was studied. The system model using Matlab Simulink block was built accordingly. The dynamic behaviors of the novel DFIG system under...
In this paper, a real time digital hardware simulation tool to study the performances and responses to grid disturbances of Doubly Fed Induction Generators (DFIGs) is presented. The simulator is a scaled down version of a DFIG wind turbine generator capable of experimenting with various control algorithms and compatibility to grid connection issues under grid disturbances. The paper discusses design,...
Nowadays doubly fed induction generators (DFIG) are the most popular generator used in wind turbine plants because of their cost effective partly rated power converter and variable speeds. On the other hand, wind energy is one of the most important renewable energy sources in smart grid this means that it will broadly implement on smart distribution network. The main issue of DFIG is their sensitivity...
The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC network through a grid side voltage source converter (GSC) and a rotor side voltage source converter (RSC) to enable the variable speed operation of the wind turbine. Moreover, it provides reactive power support to...
Based on the basic voltage and flux equations of the Doubly Fed Induction Generator, this paper derived expressions of short-circuit current of wind turbines, which are expressed by transient equations of stator and rotor flux. The transient equations of stator and rotor flux were functions of initial values of stator and rotor flux and transient time constants of stator and rotor windings. The initial...
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