Mitigating subsynchronous control interaction using fractional sliding mode control of wind farm

Abstract This paper proposes a fractional sliding mode control (FSMC) based on direct torque control to mitigate subsynchronous control interaction (SSCI) in doubly-fed induction generator (DFIG)-based wind farm. The proposed FSMC realizes chattering attenuation and SSCI mitigation simultaneously. Moreover, FSMC improves the system robustness and convergence property, which make contributions to achieving effective damping of SSCI under different operating points. Given the high number of control parameters of FSMC, genetic algorithm (GA) is adopted to optimize control parameters. Impedance-based analysis, time-domain simulation, and experimental test are conducted to test the performance of FSMC as compared to subsynchronous damping control (SSDC) and terminal sliding mode control (TSMC). Results confirm the better damping capability of FSMC under different compensations and wind speeds. FSMC also shows strong robustness against parametric uncertainty and disturbance.

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