A Multi-Port High Step-Up Converter Integrating Coupled Inductor and High-Frequency Transformer with Hybrid Isolated/non-Isolated Outputs for Renewable Energy-Based DC Micro Grids

This paper introduces a novel dual-input multi-output (DIMO) DC-DC converter for high step-up applications in renewable energy-based DC micro grids. The topology utilizes two magnetically coupled inductors whose primary windings are connected to separate input sources. Their secondary windings are integrated with voltage multiplier cells (VMCs) to achieve high voltage gain while reducing stress on semiconductor devices. The converter delivers power to three outputs: two non-isolated ports that share a common ground with the inputs, and one isolated port achieved via a high-frequency transformer (HFT). The operational principles, steady-state analysis, and efficiency are examined. A hardware prototype is developed, and both simulation and experimental results including maximum power point tracking (MPPT) performance to validate the design. The efficiency is obtained 93.21 % at rated power of 554 W.