Abstract

 Wind energy generation has attracted great interests in recent years. Doubly-fed induction generator (DFIG) for wind turbines (WTs) are largely deployed, because variable-speed WTs have many advantages over fixed-speed generation such as increased energy capture, operation at maximum power point, improved efficiency and power quality. This paper presents the operation and vector control of a DFIG system, where the stator is connected directly to a stiff grid and the rotor is connected to the grid through bidirectional back-to-back AC–DC–AC converter. The basic operational characteristics, mathematical model of the aerodynamic system and vector control technique, which is used to obtain decoupled control of powers, are investigated using the software Matlab/Simulink.
 
 Keywords: Wind turbine, doubly-fed induction generator, active and reactive power controller.
Highlights
Wind energy is a renewable source of electricity which is exploited by converting the kinetic energy of moving air into electricity
Doubly-fed induction generators (DFIG) are the most commonly used wind turbine (WT) technology because turbine speed can be adjusted as a function of wind speed in order to maximise the output power (Fletcher & Yang)
Control of the DFIG is achieved by controlling the variable frequency converter, which includes control of the rotor-side converter (RSC) and control of the grid-side converter (GSC)
Summary
Wind energy is a renewable source of electricity which is exploited by converting the kinetic energy of moving air into electricity. Doubly-fed induction generators (DFIG) are the most commonly used wind turbine (WT) technology because turbine speed can be adjusted as a function of wind speed in order to maximise the output power (Fletcher & Yang). It is an attractive and popular option for large WTs (multi-MW). Variable speed operation of WT is necessary to increase power generation efficiency, so this system requires a suitable speed controller in order to track the optimal reference speed of the WT in order to maximise the output power (Bedoud, Lakel, Ali-Rachedi, Lekhchine & Bahi, 2013; Mechter, Kemih & Ghanes, 2013)
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