NDLI: Improved fault ride through strategy for doubly fed induction generator based wind turbines under both symmetrical and asymmetrical grid faults

Content Provider	IET Digital Library
Author	Mohammadi, Jafar Afsharnia, Saeed Zadeh, Sadegh Vaez Farhangi, Shahrokh
Abstract	Due to the latest grid codes, wind turbines (WTs) are required to remain connected to grid under grid faults and supply reactive power into the grid. So, this paper proposes an improved fault ride through (FRT) strategy for doubly fed induction generators (DFIGs) under both symmetrical and asymmetrical grid faults. The proposed strategy is realized through active and passive FRT compensators. The active compensator is performed through control of the rotor- and grid-side converters of DFIGs to limit the stator and rotor over currents and inject reactive power into the grid to support the grid voltage recovery, respectively. The passive compensator is based on a three-phase rotor current limiter (RCL) resistor located in series with the rotor windings. It considerably reduces the rotor and stator overcurrent at the instants of grid faults occurrence and clearance. The proposed strategy decreases the stator and rotor over currents, electromagnetic torque oscillations and DC-link over voltage and also support grid voltage by supplying reactive power into the grid. In this way, the DFIG can fulfill the FRT requirements of the latest grid codes. Simulation studies using MATLAB/SIMULINK are conducted on a 1.5 MW DFIG-based WT to validate the effectiveness of the proposed FRT strategy.
Starting Page	1114
Ending Page	1122
Page Count	9
ISSN	17521416
Volume Number	10
e-ISSN	17521424
Issue Number	Issue 8, Sep (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/10/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2015.0586
Journal	IET Renewable Power Generation
Publisher Date	2016-04-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active FRT Compensator Asymmetrical Grid Fault Asynchronous Generator Asynchronous Machine DC-link Over Voltage DFIG Based WT Doubly Fed Induction Generator Based Wind Turbine Electromagnetic Torque Oscillation Fault Current Limiters Grid Voltage Recovery Grid-side Converter Improved Fault Ride Through Strategy Improved FRT Strategy MATLAB-Simulink Simulation Overcurrent Protection Overvoltage Protection Passive FRT Compensator Power 1.5 MW Power Generation Fault Power Grid Power System Protection Apparatus Reactive Power Reactive Power Injection Reactive Power Supply Rotor Over Current Reduction Rotor Winding Rotor-side Converter Rotors Stator Over Current Reduction Stators Symmetrical Grid Fault Three-phase Rotor Current Limiter Resistor Wind Power Penetration Wind Power Plant Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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