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

Hailiang Xu; Xiaojun Ma; Dan Sun

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

Hailiang Xu

Xiaojun Ma

Dan Sun

Vol. 15, No. 1, pp. 235-245, Jan. 2015

10.6113/JPE.2015.15.1.235

Convertor

Doubly Fed Induction Generator (DFIG)

High Voltage Ride-Through (HVRT)

Low Voltage Ride-Through (LVRT)

Reactive current support

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Abstract

This paper proposes a reactive current assignment and control strategy for a doubly-fed induction generator (DFIG) basedwind-turbine generation system under generic grid voltage sag or swell conditions. The system’s active and reactive powerconstrains during grid faults are investigated with both the grid- and rotor-side convertors (GSC and RSC) maximum ampere limitsconsidered. To meet the latest grid codes, especially the low- and high-voltage ride-through (LVRT and HVRT) requirements, anadaptive reactive current control scheme is investigated. In addition, a torque-oscillation suppression technique is designed to reducethe mechanism stress on turbine systems caused by intensive voltage variations. Simulation and experiment studies demonstrate thefeasibility and effectiveness of the proposed control scheme to enhance the fault ride-through (FRT) capability of DFIG-based windturbines during violent changes in grid voltage.

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Cite this article

[IEEE Style]

H. Xu, X. Ma, D. Sun, "Reactive Current Assignment and Control for DFIG Based Wind Turbines during Grid Voltage Sag and Swell Conditions," Journal of Power Electronics, vol. 15, no. 1, pp. 235-245, 2015. DOI: 10.6113/JPE.2015.15.1.235.

[ACM Style]

Hailiang Xu, Xiaojun Ma, and Dan Sun. 2015. Reactive Current Assignment and Control for DFIG Based Wind Turbines during Grid Voltage Sag and Swell Conditions. Journal of Power Electronics, 15, 1, (2015), 235-245. DOI: 10.6113/JPE.2015.15.1.235.