Submillisecond measuring with high synchronism of change in Practical DC microgrids

A study conducted by Tatsuo Fukano and Masaru Sugai was published in IEEE Transactions on Industrial Informatics.

With the growing adoption of renewable energy and the trend toward local energy production and consumption, DC (direct current) microgrids have gained attention as a promising technology for efficiently managing distributed energy resources such as photovoltaic systems and batteries. To continuously monitor and control the conditions of a dc microgrid, it is necessary to detect and identify both demand fluctuations and high-speed events such as ground faults and short circuits.

In this study by using an industrial-Ethernet-based measurement system, we evaluated whether changes in a practical dc microgrid on the order of submilliseconds to seconds can be measured. We measured the high-speed step response produced by a regeneration bidirectional dc power system between electric circuit measurement points utilizing fluctuating photovoltaic array outputs and analyzed the voltage and current. As a result, the inductance of the electric circuit could be accurately determined, and we were able to reproduce the delay time of the current with respect to the voltage from the resistance and inductance obtained from the analysis. This allows that the proposed system can accurately and quickly measure steep electrical phenomena and could be used to measure various states and changes in practical dc microgrids.

Title: Submillisecond Measurement with High Synchronism of Changes in Practical DC Microgrids
Authors: Fukano, T., Sugai, M.
Journal Name: IEEE Transactions on Industrial Informatics
Published: February 19, 2025
https://doi.org/10.1109/TII.2025.3538109