Improved Control for DFIG used in Wind Energy Conversion Systems

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This paper presents an improved control  of doubly fed induction generator DFIG used in wind energy conversion systems WECS based on the active disturbance rejection control ADRC. In normal condition, the maximization of power converted with MPPT control is studied . Under a symmetrical fault voltage, the behavior of DFIG and its capability to still be connected according to the new grid code requirement is presented. LVRT control scheme applied to the WECS is based on a serial active crowbar resistance and a DC chopper to keep the rotor current and the DC link voltage under their safety value,  in association with the pitch angle control to limit the rotor speed at its rated value. The fifth order model of DFIG and a two mass model of turbine are considered in order to highlight the shaft dynamic. Simulations  under Matlab Simulink are presented and discussed.
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DFIG; LVRT; Active Disturbance Rejection Control; ESO

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