This paper presents a simulation and experimental analysis of a Marine Current Turbine (MCT) system based on a Doubly Fed Induction Generator (DFIG) connected to a DC bus. We propose a Field-Oriented Control (FOC) strategy to regulate the DFIG-DC system, utilizing both Proportional-Integral (PI) controllers and High-Order Sliding Mode (HOSM) controllers. A comparative study evaluates the performance of these regulators, emphasizing their differences in efficiency, robustness, and dynamic response. The results offer insights into the advantages and limitations of each control approach, contributing to the optimization of DFIG-based power conversion systems.

This paper introduces a simple approach to develop a high performances control strategy of the DFIG-DC system using a nonlinear First-Order Sliding mode controllers to control the rotor currents in the DFIG-DC system, a diode rectifier is used to connect the stator side to the DC bus while the rotor side is connected to DC voltage through a PMW power converter. The goal of the proposed control strategy is to maintain constant the DC voltage and the stator frequency and improving the system performance by reducing harmonics currents caused by the diode rectifier. Finally, digital simulation and experimental results are presented to show the effectiveness and the performances of the proposed control strategy for the DFIG-DC configuration.