Abstract
Wind energy is predicted to account for a higher share of the world’s total power generation in the future. However, as wind power becomes more prevalent in the grid, it poses new challenges in terms of grid reliability and stability. This opens up new possibilities for the development of control methods capable of supporting the grid during voltage disruptions as well as enhancing power quality issues. This paper proposes a sliding mode control scheme for a direct-drive PMSG based wind energy conversion system. Nonlinear Sliding Mode Control (SMC) has the merit of robustness and good disturbance rejection capability, making it effective in responding to grid disturbances. The SMC chattering effect, on the other hand, increases the overall harmonic distortion injected into the grid. In this paper, the demerit of SMC has been minimized with the proper selection of SMC reaching law and the inclusion of an LCL filter and its dynamics in the design of the SMC control law. Moreover, MATLAB/Simulink simulation results have shown that the proposed control strategy has a better performance than the optimally tuned proportional-integral control during grid voltage disturbances.
Highlights
R ENEWABLE energy sources have aroused attention over the years as a viable source of electricity generation with low environmental impact [1]–[3], owing to growing concerns about future energy shortages and pollution
The detailed parameters of the wind turbine, the permanent magnet synchronous generator (PMSG), transmission line, and the control parameters are listed in the appendix
The generator-side converter and grid-side converter are modeled with the average-model-based block in Simulink with a switching frequency of 1620 and 2700 Hz, respectively
Summary
R ENEWABLE energy sources have aroused attention over the years as a viable source of electricity generation with low environmental impact [1]–[3], owing to growing concerns about future energy shortages and pollution. Ahmed M.Osman et al.: Sliding Mode Control for Grid Integration of Wind Power System based on Direct Drive PMSG. In [22] a complementary sliding mode control scheme is proposed for a two-mass model of a variable-speed wind turbine with the main aim of mitigating drive train oscillations. Results have shown that the proposed control strategy is robust against parametric fluctuation and system uncertainties It minimizes the mechanical load on the wind turbine by preventing chattering in the produced torque. A sliding mode control scheme is proposed for the converters’ control of a grid-connected direct-drive PMSG-based wind turbine. The wind turbine model used in this study has a maximum power coefficient (Cp) of 0.48 obtained at an optimal tip speed ratio (λ) of 8.512 and pitch angle (β) of 0. Maximum power can be extracted during various wind conditions
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