Distribution Power Loss Mitigation of Parallel-Connected Distributed Energy Resources in Low-Voltage DC Microgrids Using A Lagrange Multiplier-Based Adaptive Droop Control

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

This paper presents a Lagrange multiplier-based adaptive droop control to mitigate distribution power loss of parallel-connected distributed energy resource (DER) systems in DC microgrids. The distribution power loss comprising line loss and converter loss can be modelled as a quadratic function of the output currents of the DER systems, which can be optimized by the tertiary-layer Lagrange multiplier method to obtain the optimal output current references for the secondary-layer adaptive droop control. The output currents are compensated by the adaptive droop control to provide output voltage references for the primary-layer local dual-loop control, which is a conventional local control scheme for the regulations of grid-connected DC/DC converters. Both simulation and experimental results validate that the proposed control strategy can reduce the distribution power loss of parallel-connected DER systems in 48 V DC microgrids as compared to the conventional control strategy by only optimizing the line loss in different cases.

Original languageEnglish
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusPublished - 12 Jan 2021

Keywords

  • Adaptation models
  • adaptive droop control
  • Adaptive systems
  • DC microgrid
  • distributed energy resource (DER)
  • Distributed power generation
  • Distribution power loss
  • Lagrange multiplier method
  • Microgrids
  • Resource management
  • Voltage control
  • Water heating

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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