Backstepping Design Control Applied to the Wind PMSG Generator and Grid Connection Using A Multilevel Inverter

This work consists in developing a method for the non-linear control of a variable speed wind turbine system using a permanent magnet synchronous generator (PMSG) for power generation injected in grid. Objective of backstepping control is to improve performance of conversion system with choice of appropriate regulated variables. PMSG is connected to grid via back-to-back voltage sources converters (BtB VSCs), consisting of a two-stage rectifier and a five-stage NPC inverter, operated by Space Vector Pulse Width Modulation (SVPWM). In control system of generator-side converters Maximum Power Point Tracking (MPPT) algorithm has been employed. Firstly, modelling of wind turbine system has been discussed. Thereafter, the control schemes detailed description based on Backstepping Control (BSC) for control of generator and grid-side converters based on Lyapunov stability technique has been described. Furthermore, the dc-bus is regulated using BSC. A prototype is tested under varying wind conditions. The present work has been treated using the Matlab/Simulink. Simulation results proved good performance of proposed methods of BSC.