研究目的
To propose a grid-tied photovoltaic (PV) system that allows a small dc-link capacitor in the three-phase wye-connected PV system, improving system reliability by replacing electrolytic capacitors with film capacitors, and to realize low-frequency ripple-free maximum power point tracking (MPPT).
研究成果
The proposed grid-tied PV system with a modular CF-DAB dc–dc converter and cascaded multilevel inverter successfully allows the use of small dc-link capacitors, improving system reliability. The developed control strategies effectively minimize low-frequency ripple and ensure efficient MPPT. Experimental results validate the system's performance, demonstrating its potential for practical applications.
研究不足
The study focuses on a downscaled 5-kW PV converter module, and the applicability of the proposed system to larger-scale PV systems requires further investigation. Additionally, the long-term reliability of film capacitors in such applications needs to be assessed.
1：Experimental Design and Method Selection:
The study involves the development of a grid-tied PV system with a modular current-fed dual-active-bridge (CF-DAB) dc–dc converter and cascaded multilevel inverter. A dc-link voltage synchronizing control is developed to minimize the influence of reduced capacitance, and a power mitigation control based on CF-DAB dynamic model is designed to prevent low-frequency voltage variation propagation.
2：Sample Selection and Data Sources:
A downscaled 5-kW PV converter module with a small dc-link capacitor was built in the laboratory to validate the proposed control and MPPT algorithm.
3：List of Experimental Equipment and Materials:
The system includes a CF-DAB dc–dc converter, cascaded multilevel inverter, and uses film capacitors instead of electrolytic capacitors for the dc-link.
4：Experimental Procedures and Operational Workflow:
The experimental setup involves implementing the proposed control strategies and MPPT algorithm on the 5-kW PV converter module to validate performance under various conditions.
5：Data Analysis Methods:
Experimental results are analyzed to validate the converter's performance, focusing on the effectiveness of the low-frequency ripple-free MPPT and the system's reliability with small dc-link capacitors.
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