%0 Journal Article %T Efficient Low-Voltage Ride-Through Nonlinear Backstepping Control Strategy for PMSG-Based Wind Turbine During the Grid Faults %J Journal of Operation and Automation in Power Engineering %I University of Mohaghegh Ardabili %Z 2322-4576 %A Nasiri, M. %A Milimonfared, J. %A Fathi, S. H. %D 2018 %\ 12/01/2018 %V 6 %N 2 %P 218-228 %! Efficient Low-Voltage Ride-Through Nonlinear Backstepping Control Strategy for PMSG-Based Wind Turbine During the Grid Faults %K Backstepping controller %K Low voltage ride-through (LVRT) %K maximum power point tracking (MPPT) %K permanent magnet synchronous generator (PMSG) %K wind turbine %R 10.22098/joape.2006.4183.1325 %X This paper presents a new nonlinear backstepping controller for a direct-driven permanent magnet synchronous generator-based wind turbine, which is connected to the power system via back-to-back converters. The proposed controller deals with maximum power point tracking (MPPT) in normal condition and enhances the low-voltage ride-through (LVRT) capability in fault conditions. In this method, to improve LVRT capability, machine-side converter controls dc-link voltage and MPPT is performed by grid side converter. Hence, PMSG output power is reduced very fast and dc-link voltage variation is reduced.  Due to nonlinear relationship between dc-link voltage and controller input, nonlinear backstepping controller has good performances. By applying the proposed controller, dc-link overvoltage is significantly decreased. The proposed controller has good performance in comparison with Proportional-Integral (PI) controller and Sliding Mode Controller (SMC). In asymmetrical faults, to decrease grid side active power oscillations, the nonlinear backstepping dual-current controller is designed for positive- and negative- sequence components. The simulation results confirm that the proposed controller is efficient in different conditions. %U https://joape.uma.ac.ir/article_719_38bbcb2c90684d4f15ca1cdcb4d5bfa1.pdf