A dq-Axis-Based Current Perturbation Control Method for Real-Time EIS in Fuel Cell DC-DC Converters
Year: 2025
Type: article
Abstract: Fuel cells are increasingly regarded as a core power source in future energy systems owing to their high efficiency and low emissions, driving demand for real-time diagnostic technologies. Electrochemical impedance spectroscopy (EIS) is an effective method for quantitatively characterizing degradation and performance loss in fuel cells. Recent efforts focus on implementing real-time EIS using DC – DC converters. However conventional PI-based current control suffers from limited bandwidth, resulting in phase lag and magnitude attenuation at high perturbation frequencies, which degrades the accuracy of impedance measurements. This study proposes a dq-axis-based current perturbation control method for EIS implementations in a fuel cell DC-DC converter. Perturbation currents are transformed into a synchronous rotating frame, regulated as DC components for accurate high-frequency tracking. A hybrid structure with PI control for low frequencies is employed. Simulations and experiments validate improved tracking up to several kHz, ensuring stable EIS operation.
Authors: Dong-Hyeok Jang, Yoon-Tae Kim, Jae-Ho Kim, Han-Shin Youn
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7115706155
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