PSI- Issue 9

Mohammed Ezzahi et al. / Procedia Structural Integrity 9 (2018) 221–228 Author name / Structural Integrity Procedia 00 (2018) 000–000

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1. Nomenclature

Ls Lr Ls Lr

Stator cyclic inductances Rotor cyclic inductances, Proper inductances of stator Proper inductances of rotor

Ms Mr V ds V qs V dr V qr M

Mutual inductances between a stator and a rotor phases Mutual inductances between a rotor and a stator phases The voltage of the stator along the PARK axis ‘d’ The voltage of the stator along the PARK axis ‘q’ The voltage of the rotor along the PARK axis ‘d’ The voltage of the rotor along the PARK axis ‘q’ The magnetic field of the stator along the PARK axis ‘d’ The magnetic field of the stator along the PARK axis ‘q’ The magnetic field of the rotor along the PARK axis ‘d’ The magnetic field of the rotor along the PARK axis ‘q’ The current of the stator along the PARK axis ‘d’ The current of the stator along the PARK axis ‘q’ The current of the rotor along the PARK axis ‘d’ The current of the rotor along the PARK axis ‘q’ The maximum mutual inductance

. ds  . qs  dr  . qr 

i ds i qs i dr i dr P s Q s P r Q r P t

The active power of the stator The reactive power of the stator The active power of the rotor The reactive power of the rotor Total power of the DFIG machine

T em

Electromagnetic torque.

2. Introduction Wind energy conversion using Doubly Fed Induction Generator (DFIG) is one of the most important types of renewable energy generations.. For that, DFIG machine is considered as the most used machine in the wind power systems to guarantee the maximum stability and efficiency. Then, the structure of DFIG and the position of its inverters, rotor and grid sides, leads to the active and reactive power control Mesbahi (2013) et Burton (2001) and the grid coupling optimization by power electronic losses reduction Kling (2002) et Khil (2006). Thus, the fast development of power electronics and microelectronics has opened new issues of investigation for induction motor with vector control strategies Kadjoudj (2007) et Ba-Razzouk (1997). Furthermore, the control of DFIG is more complicated because it can operate at different ranges of speed. In fact, many strategies have been developed to control these machines by controlling their parameters such as power, current, current or torque. The most important target of such control strategies is to provide a fast dynamic response under transient conditions and robust characteristics against parameters’ fluctuation. Indeed, a Direct Power Control (DPC) method for DFIG drive to control the active and reactive powers directly without the need of the frame transformation and the current controller used in a FOC drive has been presented in the literature Jon (2009). So, both the simulation and the experimental results demonstrated the validity of the DPC algorithm with a fixed switching frequency. Moreover, a model of a 850 KW DFIG machine Belmokhtar (2011) has been tested and simulated by using a vector control. Then, the active and the reactive power to enhance the overall operation of the wind turbine system and its control has been modeled in the same work. Besides, Since1985, the direct torque control (DTC) was widely used for induction motor drives with fast dynamics.to produce very fast torque and flux control and robust performances of the generator taking into consideration the torque and the flux estimation accuracy and the drive parameters and perturbations Sorchini (2006), Vasudevan (2005) et Takahashi (1986) . In this paper, we are focusing over study over the Field-oriented control, which has been used and