Simplified Modeling of Ultracapacitors for Bidirectional DC-DC Converter Applications

Saichand, K and John, Vinod (2017) Simplified Modeling of Ultracapacitors for Bidirectional DC-DC Converter Applications. In: 32nd IEEE Annual Applied Power Electronics Conference and Exposition (APEC), MAY 26-30, 2017, Tampa, FL, pp. 3134-3141.

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Abstract

This paper investigates the simplified modeling of the ultracapacitors (UC) as variable voltage sources and quantifies the errors involved therein. Although modeling the energy storage devices such as Lead-acid, Li-ion, NiMH, NiCd batteries as variable voltage sources are popular, the available literature reports and treats UC as RC networks. This paper extends the voltage source model to UC which helps simplify the system design in comparison to other models based on RC networks. This paper also compares the proposed voltage source model with widely used series RC model. This is done using metrics such as the z-domain bode plots and F and Q parameters. The z-domain current loop plant transfer functions are derived from the continuous time state space models using exact discretization technique. Utilizing the derived comparison metrics, this paper investigates the limiting power and voltage operating levels of the proposed voltage source model against series RC model. Based on the proposed model, the controller design has been carried out for inner current loop control. This was experimentally verified at a power level of P-o = 1 2 0 W and a voltage level of V-g = 2 6V with the dc-dc converter switching at f(sw) = 100 kHz

Item Type:	Conference Proceedings
Series.:	Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	15 Jul 2017 07:28
Last Modified:	15 Jul 2017 07:28
URI:	http://eprints.iisc.ac.in/id/eprint/57419

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