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Title: Line resistance identification-based adaptive droop control for distribution power loss minimization of DC microgrids
Authors: Jiang, Y
Yang, Y 
Tan, SC
Hui, SYR
Issue Date: 2021
Source: 2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia), 24-27 May 2021, Singapore, p. 1891-1897
Abstract: In this paper, the distribution power loss of DC microgrids comprising both line loss and converter loss is modelled as a quadratic function of current allocation coefficients, which is a convex function with constraints. On basis of convex optimization theory, the optimal current allocation coefficients are on-line calculated by Lagrange multiplier method. Then, an adaptive virtual resistance droop control (AVRDC) is proposed to achieve the given current-sharing rate. In the proposed control, the current-sharing error generates additional adaptive virtual resistance. It is known that the sum of virtual resistance and line resistance should be in inverse proportion to current distribution coefficient. By sampling data of two control periods, the line resistance can be identified in real time. In this way, the real-time efficiency optimization control of DC microgrid can be realized, regardless of line resistance variations. The effectiveness of the proposed control strategy is validated by both simulation and experimental results.
Keywords: Convex optimization
DC microgrid
Distributed energy resource (DER)
Distribution loss
Lagrange multiplier
Publisher: Institute of Electrical and Electronics Engineers
ISBN: 978-1-7281-6344-4 (Electronic ISBN)
978-1-7281-6345-1 (Print on Demand(PoD) ISBN)
DOI: 10.1109/ECCE-Asia49820.2021.9479467
Rights: © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication Y. Jiang, Y. Yang, S. -C. Tan and S. -Y. Ron Hui, "Line Resistance Identification-Based Adaptive Droop Control for Distribution Power Loss Minimization of DC Microgrids," 2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia), 2021, pp. 1891-1897 is available at https://doi.org/10.1109/ECCE-Asia49820.2021.9479467
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