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Energies 2018, 11(4), 924; https://doi.org/10.3390/en11040924

Autonomous Control Strategy of DC Microgrid for Islanding Mode Using Power Line Communication

1
Department of Electrical Engineering, Pusan National University, Pusan 46241, Korea
2
Power Conversion and Control Research Center, HVDC Research Division, KERI, Changwon 51543, Korea
3
School of Electrical & Computer Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
*
Authors to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 8 April 2018 / Accepted: 9 April 2018 / Published: 13 April 2018
(This article belongs to the Section Electrical Power and Energy System)

Abstract

This paper proposes a DC-bus signaling (DBS) method for autonomous power management in a DC microgrid, used to improve its reliability. Centralized power management systems require communication between the power sources and loads. However, the DBS method operates based on the common DC-bus voltage and does not require communication. Based on the DC-bus voltage band, the DC-bus voltage can be used to inform the status of the DC-bus in various scenarios. The DC microgrid operates independently to maintain the system stably in the DC-bus voltage band. The DC microgrid can be divided into a grid-connected mode and an islanding mode. This paper proposes a control strategy based on power management of various independent components in islanding mode. In addition, the autonomous control method for switching the converter’s operation between grid-connected mode and islanding mode is proposed. A DC microgrid test bed consisting of a grid-connected AC/DC converter, a bidirectional DC/DC converter, a renewable energy simulator, DC home appliances and a DC-bus protector is used to test the proposed control strategy. The proposed autonomous control strategy is experimentally verified using the DC microgrid test bed. View Full-Text
Keywords: DC microgrid; DC-bus signaling (DBS); autonomous control strategy; power management algorithm; power line communication; recovery control strategy; moving average DC microgrid; DC-bus signaling (DBS); autonomous control strategy; power management algorithm; power line communication; recovery control strategy; moving average
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jeong, D.-K.; Kim, H.-S.; Baek, J.-W.; Kim, H.-J.; Jung, J.-H. Autonomous Control Strategy of DC Microgrid for Islanding Mode Using Power Line Communication. Energies 2018, 11, 924.

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