A Study on DC Power Distribution Using Transformer with Special Winding Structure in Renewable Energy-Integrated Grid

• Main Authors: Goto, Takuya, Tsusaka, Akihiro, Matsunaga, Akari, Yukita, Kazuto, Nguyen, Duy-Dinh
• Format: Conference Proceeding
• Language: English
• Subjects: AC-DC power converters; AC/DC Conversions; Costs; DC Power Supply Systems; Power supplies; Power system stability; Renewable energy sources; Ripple Reduction; Special Winding Transformer; Switches; Transformers; Voltage; Windings; Wiring
• ISSN: 2572-6013
• DOI: 10.1109/ICRERA62673.2024.10815472

The increasing use of distributed power sources, such as photovoltaic (PV) generation and fuel cells, has brought attention to DC power supply systems, which are now being considered for domestic and industrial applications alongside traditional uses in data centers. As DC-powered appliances like refrigerators and LED lighting become more common, transformer-based AC/DC converters, which avoid switching noise and reduce costs, are a promising solution. However, conventional 6-phase transformers used in these systems produce large DC voltage ripple and input current harmonics after rectification, often requiring polyphasing to mitigate these issues. This approach can increase transformer size and cost due to additional secondary windings. To address this, the authors propose a transformer with a special winding structure that minimizes secondary-side wiring complexity in multiphasing configurations. This study investigates the application of these transformers for AC/AC and hybrid AC/DC-AC/AC conversions, demonstrating improved conversion efficiency, reduced ripple, and enhanced power stability. The findings contribute to advancing DC power systems for renewable energy integration and broader applications in future power supply systems..