Distributed adaptive droop control for DC distribution systems

Vahidreza Nasirian, Ali Davoudi, Frank Lewis, Josep M. Guerrero

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Abstract

Summary form only given: A distributed-adaptive droop mechanism is proposed for secondary/primary control of dc microgrids. The conventional secondary control that adjusts the voltage set point for the local droop mechanism is replaced by a voltage regulator. A current regulator is also added to fine-tune the droop coefficient for different loading conditions. The voltage regulator uses an observer that processes neighbors' data to estimate the average voltage across the microgrid. This estimation is further used to generate a voltage correction term to adjust the local voltage set point. The current regulator compares the local per-unit current of each converter with the neighbors' on a communication graph and, accordingly, provides an impedance correction term. This term is then used to update the droop coefficient and synchronize per-unit currents or, equivalently, provide proportional load sharing. The proposed controller precisely accounts for the transmission/distribution line impedances. The controller on each converter exchanges data with only its neighbor converters on a sparse communication graph spanned across the microgrid. Global dynamic model of the microgrid is derived with the proposed controller engaged. A low-voltage dc microgrid prototype is used to verify the controller performance, link-failure resiliency, and the plug-and-play capability.
Original languageEnglish
Title of host publicationProceedings of IEEE Power and Energy Society General Meeting (PESGM), 2016
Number of pages1
PublisherIEEE Press
Publication dateJul 2016
ISBN (Electronic)978-1-5090-4168-8
DOIs
Publication statusPublished - Jul 2016
EventIEEE PES General Meeting 2016 - Boston, USA, Boston, United States
Duration: 17 Jul 201621 Jul 2016
http://www.pes-gm.org/2016/

Conference

ConferenceIEEE PES General Meeting 2016
LocationBoston, USA
CountryUnited States
CityBoston
Period17/07/201621/07/2016
Internet address

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Nasirian, V., Davoudi, A., Lewis, F., & Guerrero, J. M. (2016). Distributed adaptive droop control for DC distribution systems. In Proceedings of IEEE Power and Energy Society General Meeting (PESGM), 2016 IEEE Press. https://doi.org/10.1109/PESGM.2016.7741782