The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Development of the Improved Dynamic Model of the Supercapacitor Considering Self-Discharge

자연방전을 고려한 개선된 슈퍼커패시터의 동특성 모델 개발

  • Published : 2009.06.20
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Abstract

Due to its high power density, long cycle life and clean nature supercapacitors are widely used for improving the dynamic characteristics of the new and renewable energy sources and extending the battery run-time and life. In this paper improved dynamic model of the supercapacitor is developed by the electrochemical impedance spectroscopy technique. The developed model can be used to accurately estimate the dynamic behaviour of the supercapacitor and calculate the exact capacitance value at a certain state of charges. The model of the supercapacitor in the frequency domain is equivalently transformed into that in the time domain for Matlab/Simulink simulaton. The simulation data shows fine agreements with experimental results, thereby proving the validity and the accuracy of the developed model.

슈퍼커패시터는 전력밀도가 높고 사이클 수명이 길며 깨끗한 특성으로 인해 신재생에너지원의 동특성 보상 및 배터리의 동작시간이나 수명연장을 목적으로 널리 사용되고 있다. 본 논문에서는 개선된 슈퍼커패시터의 동특성 모델을 전기화학적 임피던스 분광법(Electrochemical Impedance Spectroscopy)을 이용하여 개발한다. 개발된 모델은 슈퍼커패시터의 정확한 동적 행동을 예측하거나 특정 충전상태(State-Of-Charge)에서의 정확한 정전용량 값을 계산하는데 사용될 수 있다. 주파수영역에서 개발된 모델은 Matlab/Simulink 시뮬레이션을 위하여 시간영역으로 등가 변환된다. 시뮬레이션 결과는 실험 결과와 일치하였으며, 이를 통해 개발된 모델의 유용함과 정확성을 증명하였다.

Keywords

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