Enhanced wind energy extraction and power quality using advanced super-twisting control for a dual-excited synchronous generator-based wind energy conversion system

This paper introduces a novel wind energy conversion system (WECS) incorporating a 1.5 MW dual-excited synchronous generator (DESG) connected to the grid. DESGs, recently gaining traction in WECS, integrate permanent magnet and wound field excitation for optimized performance. The system dynamically adjusts DESG flux using direct current excitation coils and permanent magnets to maximize wind energy extraction, improving efficiency and reliability. An advanced super-twisting control (ASTC) method is proposed to enhance control precision, which uses an attractive term and modifies the existing discontinuous term of super-twisting control (STC) with a smooth tangent hyperbolic function. This innovation aims to reduce chattering effects, effectively mitigating power fluctuations and improving response time and durability. Comparative simulations against traditional PI control and STC methods highlight ASTC's superiority, showcasing significantly lower-power fluctuations, response times, and total harmonic distortion (THD) of injected current. Notably, ASTC achieves a THD reduction ratio of 70% and an efficiency of 98.5% in varying wind conditions, outperforming STC and PI controllers, nearing unity power factor operation.