Active voltage sensorless supercapacitor bank balancer with peak current protection

V. Yuhimenko, G. Geula, G. Agranovich, M. Averbukh, A. Kuperman

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper, average modeling of a dual-supercapacitor bank, actively balanced by a bidirectional buck-boost converter is presented. In such a system, natural balancing is achieved when the converter is operated in open loop with 50% duty cycle, eliminating the need for measuring the voltage of each storage device. Nevertheless, excessive currents arise even for slight voltage misbalance because of the highly underdamped nature of the system. In order to remedy this drawback, bidirectional pulse-by-pulse inductor current limitation is introduced, which is equivalent to adding a peak-current-mode-like control loop to the system. Since the duty cycle never exceeds 50%, compensation ramp is not required to maintain stability. On the other hand, while the uncontrolled system dynamics is linear, introducing the current limit mechanism turns the closed loop dynamics into a nonlinear one, burdening the analysis task and thus calling for suitable average model to perform fast simulations for system analysis. Dynamical equations of the system are developed in order to derive the switching-cycle-averaged model. Simulations support the presented findings.

Original languageEnglish
Title of host publication2016 2nd International Conference on Intelligent Energy and Power Systems, IEPS 2016 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509017690
DOIs
StatePublished - 25 Jul 2016
Externally publishedYes
Event2nd International Conference on Intelligent Energy and Power Systems, IEPS 2016 - Kyiv, Ukraine
Duration: 7 Jun 201611 Jun 2016

Publication series

Name2016 2nd International Conference on Intelligent Energy and Power Systems, IEPS 2016 - Conference Proceedings

Conference

Conference2nd International Conference on Intelligent Energy and Power Systems, IEPS 2016
Country/TerritoryUkraine
CityKyiv
Period7/06/1611/06/16

Keywords

  • active balancing
  • buck-boost converter
  • current limitation
  • dynamic model
  • supercapacitor bank

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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