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Article

A Stability Preserving Criterion for the Management of DC Microgrids Supplied by a Floating Bus

1
Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy
2
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(11), 2102; https://doi.org/10.3390/app8112102
Received: 30 September 2018 / Revised: 27 October 2018 / Accepted: 28 October 2018 / Published: 1 November 2018
(This article belongs to the Special Issue DC & Hybrid Micro-Grids)
Direct current (DC) distribution is one of the most important enabling technologies for the future development of microgrids, due to the ease of interfacing DC components (e.g., batteries, photovoltaic systems, and native DC loads) to the grid. In these power systems, the large use of controlled power converters suggests the need of a careful analysis of system stability, as it can be impaired in particular conditions. Indeed, in DC power systems, a destabilizing effect can arise due to the presence of inductor/capacitor (LC) filtering stages (installed for power quality requirements) and high-bandwidth controlled converters, behaving as constant power loads (CPLs). This issue is even more critical when the CPL is potentially fed only by the battery, causing the DC bus to be floating. In this context, Lyapunov theory constitutes a valuable method for studying the system stability of DC microgrids feeding CPLs. Such a theory demonstrates how the region of asymptotic stability (RAS) shrinks as the state of charge of the battery diminishes (i.e., as the bus voltage decreases). Once the accuracy of the RAS is validated by comparing it to the real basin of attraction (BA), numerically derived using continuation methods, a smart power management of the CPL can be proposed to preserve the system stability even in the presence of a low bus voltage. Indeed, a suitably designed criterion for limiting the load power can guarantee the invariance of RAS and BA for each equilibrium point. An electric vehicle was used herein as a particular DC microgrid for evaluating the performance derating given by the power limitation. View Full-Text
Keywords: islanded DC microgrid; battery-only operation; constant power load; CPL; floating DC bus; stability criterion; power management islanded DC microgrid; battery-only operation; constant power load; CPL; floating DC bus; stability criterion; power management
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MDPI and ACS Style

Bosich, D.; Vicenzutti, A.; Grillo, S.; Sulligoi, G. A Stability Preserving Criterion for the Management of DC Microgrids Supplied by a Floating Bus. Appl. Sci. 2018, 8, 2102. https://doi.org/10.3390/app8112102

AMA Style

Bosich D, Vicenzutti A, Grillo S, Sulligoi G. A Stability Preserving Criterion for the Management of DC Microgrids Supplied by a Floating Bus. Applied Sciences. 2018; 8(11):2102. https://doi.org/10.3390/app8112102

Chicago/Turabian Style

Bosich, Daniele, Andrea Vicenzutti, Samuele Grillo, and Giorgio Sulligoi. 2018. "A Stability Preserving Criterion for the Management of DC Microgrids Supplied by a Floating Bus" Applied Sciences 8, no. 11: 2102. https://doi.org/10.3390/app8112102

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