PSO-Based Higher Order Sliding Mode Controller for PMSG-Based Tidal Turbine

A grid-connected dynamic speed tidal energy conversion system (TECS) employing a permanent magnetic synchronous generator (PMSG) is presented in this paper for its numerous advantages over conventional doubly fed induction generators. In a grid-connected TECS, the most significant electrical characteristics are the overvoltage of DC link, and active and reactive power injection into the grid. However, designing a dedicated controller for PMSG-based tidal turbines is challenging due to inherent parametric uncertainties and nonlinear dynamics. In this paper, a particle swarm optimizer-based nonlinear higher order sliding mode control (PSO-HO-SMC) is presented for the grid-side converter. It attempts to establish a decoupled ability to control both actual and reactive powers injected in the grid with nearly zero reactive power. Also, the PSO-HO-SMC approach overcomes the limitations of the first-order sliding mode control (FO-SMC) such as chattering and steady-state tracking error using optimized gain constants. By comparing many scenarios using FO-SMC and traditional HO-SMC, simulation on the MATLAB® Simulink environment is used to confirm the efficiency of the proposed approach.