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This paper deals with the control of Doubly Fed Induction Generator (DFIG) in wind energy conversion system (WECS), to regulate the real and reactive power exchanged with the grid. The control architecture consists of two pulse width modulation converters allowing the generator to work in both sub-synchronous and super-synchronous mode. The real power is controlled by the energy maximization strategy, while the reactive power is controlled to operate the system under the unity power factor. The dynamic behavior of DFIG and its control are modelled based on the stator flux orientation (SFO) strategy. The control algorithm design based on anti-windup integration is developed in Matlab-Simulink. Introduction In the latest years, environmental pollution has turn out to be a primary challenge in humans’ daily lives, and a possible energy crisis has led researchers to develop new technology for generating clean and renewable energy. Today, there has been a strong penetration of wind energy into the power supply network. Consequently, Wind energy Conversion systems (WECS) using DFIGs have attracted increasing research interest as renewable generating units with a dominating market percentage of approximately 50% [1]. The DFIGs are widely used in WECS since they combine advantages of variable speed and the use of a fractional converter that leads to an enhanced efficiency and reduced costs [1][2]. Therefore, it powers converters rated is 30% of the overall generator output power under steady-state. Several control strategy have been reported in the literature for the control of wind turbine system based on DFIG [2]. In [3], vector control based on stator flux-oriented control of the DFIG has been developed where the maximum power point tracking (MPPT) algorithm was detailed. The author in [8], also used RQ control due to lack of performance of classical PI during transient response. The overall modeling of the DFIG system in a power systems is given in [4][5]. The MPPT control algorithm for power regulation is discussed in [4][8] where the aim is to regulate the power factor of the overall wind turbine. The MPPT with the use of the phase locked loop (PLL) was investigated in [6][7], where the authors investigated the control of the grid-connected DFIG system using voltage oriented control (VOC) technic [5]. However, there is still room for research on the power factor regulation direct speed control (MPPT). In this paper a control method for the machine inverter to regulate the active and reactive power exchanged between the machine and the grid is developed. The active power is controlled to be adapted to the wind speed of the wind turbine system and the reactive power control allows unitary power factor operation. The compromise between dynamic performances of generator and robustness of PI controller is not an easy task to handle due to integral anti windup problem, therefore anti-windup action is incorporated to the PI controller. Wind Energy Conversion System The common composition of the DFIG system is displayed figure 1, where the back-to-back converter is connected to the rotor side of the DFIG on one side and on the other side it is connected to the grid through a transformer. The stator of the DFIG is also connected to the grid through a 1 transformer so that the DFIG voltage matches the grid voltage level. The total active power generated by a lossless DFIG system is given as Pg = Ps + Pr = (1 ± s)PS (1) Where Pg is the total power generated by the DFIG; s is the slip; Ps is the stator active power and Pr = ±sPs is the rotor active power.

Active and Reactive Power Control of Doubly Fed-Induction Generator Based on Variable Speed Wind Power Generation