Efficient DC power converter enhances microgrid sustainability

Efficient DC power converter enhances microgrid sustainability

by Riko Seibo

Tokyo, Japan (SPX) Apr 22, 2024

A novel DC-DC power converter developed by Kobe University promises enhanced energy storage and conversion efficiency, marking a key step in advancing microgrid technologies. This new converter, designed to integrate seamlessly with various DC energy sources, improves system stability and simplicity with an unprecedented operational efficiency.

Electric power is classified into two types: AC (alternating current) and DC (direct current). Despite AC being the chosen standard for national power grids, the reliance on DC power by solar panels, batteries, electric vehicles, and computers necessitates a conversion, often with significant energy loss. The adoption of DC microgrids could mitigate this by directly linking renewable energy sources and storage units to consumers, eliminating the need for conversion and allowing for voltage flexibility essential for diverse applications.

Researchers from Kobe University and National Chung Hsing University, including MISHIMA Tomokazu and LAI Ching-Ming, have spearheaded the development of this technology. “Our interdisciplinary approach and advanced facilities have underpinned our success in developing a prototype that demonstrates significant advantages over existing systems,” explained LIU Shiqiang, a student team member at Kobe University.

The new design, featured in the journal IEEE Transactions on Power Electronics, optimizes voltage ratio and inductor current balance, improving performance for electric vehicle-centric applications. “The asymmetrical duty limit control is particularly beneficial for electric vehicle-connected DC microgrids,” Liu added.

The prototype’s effectiveness, showing efficiencies up to 98.3%, underscores its potential for real-world application and sets the stage for further enhancements and commercialization efforts by UPE-Japan, a startup emerging from Kobe University. “Our aim is to foster the shift towards more reliable and sustainable energy solutions, especially for electric vehicles and renewable energy systems,” Liu stated.

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