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http://dx.doi.org/10.6113/JPE.2015.15.1.235

Reactive Current Assignment and Control for DFIG Based Wind Turbines during Grid Voltage Sag and Swell Conditions  

Xu, Hailiang (Department of Control Engineering, Academy of Armored Force Engineering)
Ma, Xiaojun (Department of Control Engineering, Academy of Armored Force Engineering)
Sun, Dan (College of Electrical Engineering, Zhejiang University)
Publication Information
Journal of Power Electronics / v.15, no.1, 2015 , pp. 235-245 More about this Journal
Abstract
This paper proposes a reactive current assignment and control strategy for a doubly-fed induction generator (DFIG) based wind-turbine generation system under generic grid voltage sag or swell conditions. The system's active and reactive power constrains during grid faults are investigated with both the grid- and rotor-side convertors (GSC and RSC) maximum ampere limits considered. To meet the latest grid codes, especially the low- and high-voltage ride-through (LVRT and HVRT) requirements, an adaptive reactive current control scheme is investigated. In addition, a torque-oscillation suppression technique is designed to reduce the mechanism stress on turbine systems caused by intensive voltage variations. Simulation and experiment studies demonstrate the feasibility and effectiveness of the proposed control scheme to enhance the fault ride-through (FRT) capability of DFIG-based wind turbines during violent changes in grid voltage.
Keywords
Convertor; Doubly Fed Induction Generator (DFIG); High Voltage Ride-Through (HVRT); Low Voltage Ride-Through (LVRT); Reactive current support;
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