A Comprehensive Review of LVRT Capability and Advanced Nonlinear Backstepping Control of Grid-Connected Wind-Turbine-Driven Permanent Magnet Synchronous Generator During Voltage Dips

This paper deals with different strategies applied to enhance the low-voltage ride-through (LVRT) ability for grid-connected wind-turbine-driven permanent magnet synchronous generator (PMSG). The most commonly established LVRT solutions in the literature are typically based on: external devices-based methods, which raise system costs, and advanced controller-based methods, which raise control system complexity. Hence, the main goal of this study is to use an advanced controller-based method solution by using the integrated backstepping control (IBSC) considering grid requirements over LVRT capability during symmetrical voltage dips scenarios. Effectively, this nonlinear integral backstepping control strategy is proposed to improve the dynamic performance of the wind power conversion system (WPCS) as well as to overcome the injected current harmonics into the grid of the classical proportional integral control (PI). In addition, the resulting IBSC methodology is quite straightforward, resulting in a significant reduction in costs and online computing time. Time-domain simulation tests using MATLAB/Simulink on a wind-turbine-driven PMSG demonstrate the proposed IBSC method LVRT capacity and effectiveness when compared to the classical PI method.