Analysis of Plug-In and Plug-Out of Converters in Droop Controlled DC Microgrid Systems

This article presents methodologies to achieve seamless plug-in and plug-out of converters in droop-controlled dc microgrid (MG) systems. It is shown that the typical approach of precharging the converter to the nominal voltage before plugging it into a droop-controlled dc MG system can result in hi...

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Bibliographic Details
Published inIEEE journal of emerging and selected topics in industrial electronics (Print) Vol. 6; no. 3; pp. 1140 - 1152
Main Authors Sharma, Shrivatsal, Iyer, Vishnu Mahadeva, Dhiman, Shubham, Bhattacharya, Subhashish, Yu, Lan, Gernant, Tim
Format Journal Article
LanguageEnglish
Published IEEE 01.07.2025
Subjects
Analytical models
Cables
Control systems
DC microgrid (MG)
droop control
hot-swap
Inrush current
Main-secondary
Mathematical models
Microgrids
plug-in
plug-out
Training
Transient analysis
Voltage control
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Summary:This article presents methodologies to achieve seamless plug-in and plug-out of converters in droop-controlled dc microgrid (MG) systems. It is shown that the typical approach of precharging the converter to the nominal voltage before plugging it into a droop-controlled dc MG system can result in high transients in converter currents, which can trigger the system's shutdown. New and effective methodologies are presented to achieve seamless plug-in and plug-out of a converter from the dc MG system. The seamless plug-in is achieved by controlling the reference voltage of the converter and plug-out is achieved by controlling the droop resistances. The proposed methodologies act as damping techniques to minimize the transients in converter currents. The methodologies are implemented using the conventional droop control and thus are simple to implement. An analytical model is developed for a generic dc MG system to analyze the performance of the system during a hot-swap of a converter. The model is also used to propose guidelines for controller design to achieve seamless plug-in and plug-out of a converter. Extensive experimental results on different configurations and operating points of MG systems are provided to validate the proposed methodologies.
ISSN:2687-9735
2687-9743
DOI:10.1109/JESTIE.2025.3567963