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Title: DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques

Abstract

This paper presents a review of control strategies, stability analysis, and stabilization techniques for dc microgrids (MGs). Overall control is systematically classified into local and coordinated control levels according to respective functionalities in each level. As opposed to local control, which relies only on local measurements, some line of communication between units needs to be made available in order to achieve the coordinated control. Depending on the communication method, three basic coordinated control strategies can be distinguished, i.e., decentralized, centralized, and distributed control. Decentralized control can be regarded as an extension of the local control since it is also based exclusively on local measurements. In contrast, centralized and distributed control strategies rely on digital communication technologies. A number of approaches using these three coordinated control strategies to achieve various control objectives are reviewed in this paper. Moreover, properties of dc MG dynamics and stability are discussed. This paper illustrates that tightly regulated point-of-load converters tend to reduce the stability margins of the system since they introduce negative impedances, which can potentially oscillate with lightly damped power supply input filters. It is also demonstrated that how the stability of the whole system is defined by the relationship of the source andmore » load impedances, referred to as the minor loop gain. Several prominent specifications for the minor loop gain are reviewed. Finally, a number of active stabilization techniques are presented.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE)
OSTI Identifier:
1336245
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Power Electronics; Journal Volume: 31; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; Coordinated control; DC microgrid (MG); impedance specifications; local control; stability

Citation Formats

Dragicevic, Tomislav, Lu, Xiaonan, Vasquez, Juan, and Guerrero, Josep. DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques. United States: N. p., 2015. Web. doi:10.1109/TPEL.2015.2478859.
Dragicevic, Tomislav, Lu, Xiaonan, Vasquez, Juan, & Guerrero, Josep. DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques. United States. doi:10.1109/TPEL.2015.2478859.
Dragicevic, Tomislav, Lu, Xiaonan, Vasquez, Juan, and Guerrero, Josep. Thu . "DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques". United States. doi:10.1109/TPEL.2015.2478859.
@article{osti_1336245,
title = {DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques},
author = {Dragicevic, Tomislav and Lu, Xiaonan and Vasquez, Juan and Guerrero, Josep},
abstractNote = {This paper presents a review of control strategies, stability analysis, and stabilization techniques for dc microgrids (MGs). Overall control is systematically classified into local and coordinated control levels according to respective functionalities in each level. As opposed to local control, which relies only on local measurements, some line of communication between units needs to be made available in order to achieve the coordinated control. Depending on the communication method, three basic coordinated control strategies can be distinguished, i.e., decentralized, centralized, and distributed control. Decentralized control can be regarded as an extension of the local control since it is also based exclusively on local measurements. In contrast, centralized and distributed control strategies rely on digital communication technologies. A number of approaches using these three coordinated control strategies to achieve various control objectives are reviewed in this paper. Moreover, properties of dc MG dynamics and stability are discussed. This paper illustrates that tightly regulated point-of-load converters tend to reduce the stability margins of the system since they introduce negative impedances, which can potentially oscillate with lightly damped power supply input filters. It is also demonstrated that how the stability of the whole system is defined by the relationship of the source and load impedances, referred to as the minor loop gain. Several prominent specifications for the minor loop gain are reviewed. Finally, a number of active stabilization techniques are presented.},
doi = {10.1109/TPEL.2015.2478859},
journal = {IEEE Transactions on Power Electronics},
number = 7,
volume = 31,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}