Variable-Gain Super-Twisting Sliding Mode Damping Control of Series-Compensated DFIG-Based Wind Power System for SSCI Mitigation

Subsynchronous oscillation, caused by the interaction between rotor side converter (RSC) control of doubly fed induction generator (DFIG) and series-compensated transmission line, is an alleged subsynchronous (SSCI). SSCI can cause DFIGs to go offline crowbar circuit breakdown, then deteriorate power system stability. This paper proposes a novel adaptive super-twisting sliding mode mitigation method for DFIG-based wind systems. Rotor currents were constrained track reference values which are determined maximum point tracking (MPPT) reactive demand. Super-twisting laws designed generate RSC signals. True non-overestimated gains conceived with aid barrier function, without need upper bound uncertainty derivatives. Stability proof studied closed-loop was demonstrated in detail help Lyapunov method. Time-domain simulation 100 MW aggregated DFIG farm executed on MATLAB/Simulink platform. Some comparative results conventional PI control, partial feedback linearization first-order also obtained, verify validity, robustness, superiority proposed strategy.