Second-Order Sliding Mode Current Control of Doubly Salient Permanent Magnet Generator

Aiming at the efficient and stable utilization of ocean current energy in complex marine environment, a control strategy of doubly salient permanent magnet generator used for a marine current turbine is proposed. Firstly, the mathematical model of the doubly salient permanent magnet generator is deduced and constructed. However, since the doubly salient permanent magnet generator is a strongly coupled nonlinear machine, the conventional linear controller is difficult to meet the control requirements. Moreover, it has an inherent torque ripple. Therefore, a high-order sliding mode control strategy based on super-twisting algorithm is proposed. Then, the sliding surface and control law are designed. Finally, the simulation results show that compared with the traditional sliding mode controller, the chattering is small, the response speed is fast, and the robustness of the system is strong.