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

This article 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 modeled as a quadratic function of...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 36; no. 8; pp. 9105 - 9118
Main Authors Jiang, Yajie, Yang, Yun, Tan, Siew-Chong, Hui, Shu-Yuen Ron
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Adaptation models
Adaptive control
Adaptive droop control
Adaptive systems
Converters
dc microgrid
distributed energy resource (DER)
Distributed generation
Distributed power generation
distribution power loss
Electric potential
Electric power distribution
Energy sources
Lagrange multiplier
Lagrange multiplier method
Microgrids
Optimization
Parallel connected
Quadratic equations
Resource management
Voltage
Voltage control
Water heating
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Summary:This article 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 modeled 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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3050506