A Multi-Port Partial Power Converter for PV based Smart Home Applications

The world is undergoing a profound transformation with an increasing penetration of renewable energy sources (RES), expanding from utility-scale projects to residential applications. Power electronic converters (PECs) play a crucial role in enabling advanced energy management in smart homes, allowing residences to operate as intelligent ecosystems. Recently, the integration of RES and residential energy storage systems (ESS) has enabled direct power supply to smart homes through DC-DC conversion, reducing electricity costs and ensuring energy availability during grid outages. Therefore, DC-DC converters have become essential components in smart home architectures. Traditionally, full power processing (FPP) DC-DC converters have been utilized, processing the entire input power. However, partial power processing (PPP) architectures, which process only a fraction of the total power, offer significant advantages in reducing losses, cost, and converter volume. Thus, applying PPP in smart home applications enhances system efficiency and integration. This study develops and analyzes a multi-port PPP converter architecture for smart home applications. The proposed architecture aims to improve efficiency compared to conventional multi-port PPP converters, while reducing cost and volume by using partially rated power electronic devices instead of fully rated FPP devices. To achieve these goals, optimal topologies are explored, and a detailed design guideline for the proposed converter is provided, enabling practical implementation. Furthermore, the relationship between PPP capability and converter losses is analyzed to validate the efficiency improvement. Finally, a prototype of the proposed architecture is implemented, and its steady-state operation, power management capability, and efficiency under different load conditions are experimentally verified, including the peak efficiency.

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