This paper deals with the control design of a single-phase Modular Multilevel Converter (MMC) interfaced with a photovoltaic (PV) system. The proposed strategy aims to simultaneously achieve two main objectives: i) power factor correction (PFC) on the grid side to improve power quality, and ii) regulation of the PV voltage to ensure precise maximum power point tracking (MPPT). To fulfill these objectives, a cascaded two-loop control structure is developed, in the outer loop, a filtered proportional-integral (FPI) controller is employed, while an Active Disturbance Rejection Control (ADRC) technique is adopted in the inner loop to enhance dynamic performance and disturbance rejection capability. In addition, a comparative analysis with conventional control approaches is carried out to highlight the effectiveness and robustness of the proposed method. The performance of the suggested controller is verified using MATLAB/Simulink simulation, and the obtained results demonstrate fast dynamic response, accurate tracking performance, and stable operation under different operating conditions.
Amine El Boudali, A. Abouloifa, Ouijdane Arich et al.· EPJ Web of Conferences· 0 citations
As renewable energy becomes increasingly essential to global energy strategies, grid-connected photovoltaic (PV) systems are gaining prominence. However, these systems introduce challenges related to power quality and system stability. This paper presents a unified nonlinear cascaded control strategy tailored for a multilevel single-input dual-output (SIDO) boost converter-based grid-connected PV system. The proposed approach is aimed at integrating the sliding mode control (SMC) for both maximum power point tracking (MPPT) and power factor correction (PFC) tasks, while a filtered proportional-integral (PI) controller is employed to stabilize DC voltage regulation. This combination control framework ensures these objectives under varying environmental conditions, all while taking advantage of multilevel conversion, such as reduced component stress and high voltage gain without transformers. Simulations studied within the MATLAB/Simulink environment confirm the proposed approach effectiveness, demonstrating reliable performance and enhanced improvements in system stability compared with the widely conventional approach.
Ouijdane Arich, A. Abouloifa, Amine El Boudali et al.· EPJ Web of Conferences· 0 citations
