The study, co-authored by researcher Hosseini from Near East University, introduces grid-connected system for renewable energy source (RES) applications. This collaborative effort underscores the interdisciplinary approach taken to address contemporary challenges in renewable energy integration.
The modification involves employing a DC-DC flyback converter to adjust the voltages of DC-link capacitors, ensuring uniform values and mitigating capacitor charging spikes. This approach not only reduces the size and cost per output power but also facilitates active and reactive power support while optimizing the injected current into the grid. By generating two isolated DC sources via the flyback converter, the system increases the number of voltage levels produced at the output, enhancing overall efficiency.
One of the notable advancements is the resolution of inrush currents during capacitor charging, achieved through the incorporation of an inductor with a parallel power diode in the charging current path. This design feature effectively limits capacitor charging spikes, improving system reliability and performance.
Furthermore, the modified SC-based multilevel inverter boasts voltage boosting capabilities with a gain factor of 2 and accommodates reverse currents for inductive loads through existing power switches. The utilization of the peak current control (PCC) method enables precise regulation of active and reactive power injected into the grid, ensuring optimal grid integration and stability.
Comparative analysis reveals that the modified topology offers superior cost-effectiveness and maximum power density compared to alternative configurations. Simulation results validate the efficacy of the proposed modifications, particularly in mitigating capacitor charging current spikes and enhancing overall system performance.
In experimental testing conducted under grid-connected conditions, the SC-based multilevel inverter demonstrates exemplary performance, underscoring its suitability for real-world applications. Collaboratively authored, with contributions from researchers including those from Near East University, this study presents a significant advancement in grid-connected renewable energy systems, promising enhanced efficiency, reliability, and cost-effectiveness for sustainable energy integration.
More Information:
https://ieeexplore.ieee.org/abstract/document/10210129
