Supervisory Control of an Adaptive-Droop Regulated DC Microgrid with Battery Management Capability

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Abstract

DC power systems are gaining an increasing interest in renewable energy applications because of the good matching with dc output type sources such as photovoltaic (PV) systems and secondary batteries. In this paper, several distributed generators (DGs) have been merged together with a pair of batteries and loads to form an autonomous dc Microgrid (MG). To overcome
the control challenge associated with coordination of multiple batteries within one stand-alone MG, a double-layer hierarchical control strategy was proposed; 1) The unit-level primary control layer was established by an adaptive voltage-droop (VD) method aimed to regulate the common bus voltage and to sustain the
states of charge (SOCs) of batteries close to each other during moderate replenishment. The control of every unit was expanded with unit-specific algorithm, i.e. finish-of-charging for batteries and maximum power point tracking (MPPT) for renewable energy sources (RESs), with which a smooth on-line overlap was designed; 2) the supervisory control layer was designed to
use the low bandwidth communication interface between the central controller and sources in order to collect data needed for adaptive calculation of virtual resistances (VRs) as well as transit criteria for changing unit-level operating modes. A small-signal stability for the whole range of VRs. The performance of developed control was assessed through experimental results.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume29
Issue number2
Pages (from-to)695-706
Number of pages12
ISSN0885-8993
DOIs
Publication statusPublished - Feb 2014

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Secondary batteries
Electric potential
Bandwidth
Controllers
Communication

Keywords

  • Adaptive droop control
  • Battery charger
  • Distributed Generation (DG)
  • Supervisory control
  • Microgrid (MG)

Cite this

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title = "Supervisory Control of an Adaptive-Droop Regulated DC Microgrid with Battery Management Capability",
abstract = "DC power systems are gaining an increasing interest in renewable energy applications because of the good matching with dc output type sources such as photovoltaic (PV) systems and secondary batteries. In this paper, several distributed generators (DGs) have been merged together with a pair of batteries and loads to form an autonomous dc Microgrid (MG). To overcomethe control challenge associated with coordination of multiple batteries within one stand-alone MG, a double-layer hierarchical control strategy was proposed; 1) The unit-level primary control layer was established by an adaptive voltage-droop (VD) method aimed to regulate the common bus voltage and to sustain thestates of charge (SOCs) of batteries close to each other during moderate replenishment. The control of every unit was expanded with unit-specific algorithm, i.e. finish-of-charging for batteries and maximum power point tracking (MPPT) for renewable energy sources (RESs), with which a smooth on-line overlap was designed; 2) the supervisory control layer was designed touse the low bandwidth communication interface between the central controller and sources in order to collect data needed for adaptive calculation of virtual resistances (VRs) as well as transit criteria for changing unit-level operating modes. A small-signal stability for the whole range of VRs. The performance of developed control was assessed through experimental results.",
keywords = "Adaptive droop control, Battery charger, Distributed Generation (DG), Supervisory control, Microgrid (MG)",
author = "Tomislav Dragicevic and Guerrero, {Josep M.} and Vasquez, {Juan Carlos} and Davor Skrlec",
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Supervisory Control of an Adaptive-Droop Regulated DC Microgrid with Battery Management Capability. / Dragicevic, Tomislav; Guerrero, Josep M.; Vasquez, Juan Carlos; Skrlec, Davor.

In: I E E E Transactions on Power Electronics, Vol. 29, No. 2, 02.2014, p. 695-706.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Supervisory Control of an Adaptive-Droop Regulated DC Microgrid with Battery Management Capability

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AU - Guerrero, Josep M.

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AB - DC power systems are gaining an increasing interest in renewable energy applications because of the good matching with dc output type sources such as photovoltaic (PV) systems and secondary batteries. In this paper, several distributed generators (DGs) have been merged together with a pair of batteries and loads to form an autonomous dc Microgrid (MG). To overcomethe control challenge associated with coordination of multiple batteries within one stand-alone MG, a double-layer hierarchical control strategy was proposed; 1) The unit-level primary control layer was established by an adaptive voltage-droop (VD) method aimed to regulate the common bus voltage and to sustain thestates of charge (SOCs) of batteries close to each other during moderate replenishment. The control of every unit was expanded with unit-specific algorithm, i.e. finish-of-charging for batteries and maximum power point tracking (MPPT) for renewable energy sources (RESs), with which a smooth on-line overlap was designed; 2) the supervisory control layer was designed touse the low bandwidth communication interface between the central controller and sources in order to collect data needed for adaptive calculation of virtual resistances (VRs) as well as transit criteria for changing unit-level operating modes. A small-signal stability for the whole range of VRs. The performance of developed control was assessed through experimental results.

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