Adaptive Current Sharing of Distributed Battery Systems in DC Microgrids Using Adaptive Virtual Resistance-Based Droop Control

Yajie Jiang, Yun Yang, Siew Chong Tan, Shu Yuen Ron Hui

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Droop control are widely adopted in DC microgrids to achieve equal current sharing of distributed battery systems (DBS). However, as equivalent resistances of cables and circuit components between the DBS and the microgrid will change over the long-term operation of the system, unequal current sharing of the DBS that use conventional droop control with constant virtual resistances may accelerate the uneven ageing of the battery packs. To resolve this issue, in this paper, an adaptive virtual resistance-based droop control, which adapts to the change of the equivalent resistances to achieve adaptive current sharing of DBS, is proposed. With this method, the output currents of DBS are fed to a central controller via a communication network and is then controlled by proportional-integral (PI) controllers to generate a set of variable virtual resistances. These parameters are then added to the original static virtual resistances of the droop control to form the adaptive virtual resistances. Furthermore, to ensure precise current sharing of DBS, a Differential Evolution (DE) algorithm is introduced to optimize the parameter tuning of the PI controllers. Both simulation and experimental results validate the current sharing capabilities of DBS under the proposed control in handling the change of equivalent resistances. Besides, the results also demonstrate that the DBS controlled by the proposed control with sub-optimal tunings of the PI controllers can result in slight unequal current sharing.

Original languageEnglish
Title of host publication2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4262-4267
Number of pages6
ISBN (Electronic)9781728103952
DOIs
Publication statusPublished - Sep 2019
Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
Duration: 29 Sep 20193 Oct 2019

Publication series

Name2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019

Conference

Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
CountryUnited States
CityBaltimore
Period29/09/193/10/19

Keywords

  • Adaptive virtual resistance-based droop control
  • Current sharing
  • DC microgrid
  • Differential Evolution (DE)
  • Distributed battery system (DBS)
  • Droop control

ASJC Scopus subject areas

  • Mechanical Engineering
  • Control and Optimization
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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