### Design of Optimized Sliding Mode Control to Improve the Dynamic Behavior of PMSG Wind Turbine with NPC Back-to-Back Converter

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#### Abstract

Recently, the Permanent Magnet Synchronous Generator (PMSG) has drawn more interest because of its simple structure, higher efficiency and better controllability. In this study, first, the PMSG dynamic model together with three levels NPC back-to-back converter, using the state-space averaging technique, is developed. Then, a sliding mode control strategy is proposed to achieve control of active and reactive powers exchanged between the stator of the PMSG and the grid. The sliding surfaces are introduced and zero dynamic of the closed-loop system is analyzed. Furthermore, PSO algorithm is employed to optimize the parameters of a conventional PI and the proposed sliding mode controllers for PMSG, grid-side and rotor-side converters. At the end, based on optimal values, the appropriateness of two controllers to deal with wind disturbances is evaluated. The simulation results in MATLAB confirmed the good dynamic performance of optimized sliding mode controller to attenuate such disturbances *Copyright © 2013 Praise Worthy Prize - All rights reserved.*

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