Second?order sliding mode control of wind turbines to enhance the fault?ride through capability under unbalanced grid faults

The integration of wind generation to the grid is growing rapidly across world. As a result, operators have introduced so-called codes (GC), which nowadays include range technical conditions and requirements, generators must fulfill. Among these, low-voltage ride through (LVRT) requirement for turbines stay connected continue operate during disturbance. In this study, control structure, combining inertial kinetic energy storage with crowbar circuit, proposed enhance capability turbine generator (WTG) based on wound-field synchronous (WFSG) under unsymmetrical voltage dips. For grid-side converter (GSC), decoupled double reference frame (DDSRF) d-q current controller used. Furthermore, second-order sliding mode (SOSMC) super-twisting (ST) algorithm GSC machine-side (MSC) improve response speed achieve an accurate regulation dq-axis components simultaneously. main objectives are balanced, sinusoidal smooth real reactive powers reduce influence negative-sequence voltage. A series simulations presented demonstrate effectiveness scheme in improving LVRT WFSG-driven power quality system unbalanced conditions.