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Seamless Power Management for a Distributed DC Microgrid with Minimum Communication Links under Transmission Time Delays

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  • Dat Thanh Tran

    (Department of Electrical and Information Engineering, Research Center for Electrical and Information Technology, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

  • Al Faris Habibullah

    (Department of Electrical and Information Engineering, Research Center for Electrical and Information Technology, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

  • Kyeong-Hwa Kim

    (Department of Electrical and Information Engineering, Research Center for Electrical and Information Technology, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

Abstract

To maintain voltage stabilization under transmission time delays, this paper proposes a seamless power management scheme for a distributed DC microgrid (DCMG) with minimum digital communication links (DCLs). First, a DCL topology with minimum communication data is presented for the construction of distributed DCMG system not only to mitigate the communication burden but also to enhance the system’s flexibility and reliability. In addition, based on information gathered from nearby agents and local measurements, the operating modes of local agents in a DCMG system are determined properly to ensure a proper power balance under various conditions. During normal operation, the proposed scheme works as a distributed control scheme either in the grid-connected or islanded mode to take advantage of the distributed control method. To maintain seamless power management even under transmission time delays such as grid fault detection delays and grid recovery detection delays, the operating modes of each agent in a DCMG system are switched to a decentralized scheme based on the droop control method. When the utility grid information is properly identified by all power agents after a transmission time delay, the DCMG system returns to the distributed control scheme based on DC-link voltage (DCV) control to guarantee voltage stabilization. Furthermore, the scalability issue of a distributed DCMG system is also considered in this paper when an additional energy storage system (AESS) agent is involved in the DCMG system. For this purpose, a DCL topology with minimum communication data is designed for the AESS, which enables power units to participate in or to leave the distributed DCMG system easily. Simulation and experimental results under various conditions demonstrate the effectiveness and reliability of the proposed seamless power management strategy.

Suggested Citation

  • Dat Thanh Tran & Al Faris Habibullah & Kyeong-Hwa Kim, 2022. "Seamless Power Management for a Distributed DC Microgrid with Minimum Communication Links under Transmission Time Delays," Sustainability, MDPI, vol. 14(22), pages 1-29, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:22:p:14739-:d:967193
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    References listed on IDEAS

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    1. Sang-Ji Lee & Jin-Young Choi & Hyung-Joo Lee & Dong-Jun Won, 2017. "Distributed Coordination Control Strategy for a Multi-Microgrid Based on a Consensus Algorithm," Energies, MDPI, vol. 10(7), pages 1-16, July.
    2. Al Faris Habibullah & Faris Adnan Padhilah & Kyeong-Hwa Kim, 2021. "Decentralized Control of DC Microgrid Based on Droop and Voltage Controls with Electricity Price Consideration," Sustainability, MDPI, vol. 13(20), pages 1-29, October.
    3. Guizhen Tian & Yuding Zheng & Guangchen Liu & Jianwei Zhang, 2022. "SOC Balancing and Coordinated Control Based on Adaptive Droop Coefficient Algorithm for Energy Storage Units in DC Microgrid," Energies, MDPI, vol. 15(8), pages 1-15, April.
    4. Faris Adnan Padhilah & Kyeong-Hwa Kim, 2020. "A Power Flow Control Strategy for Hybrid Control Architecture of DC Microgrid under Unreliable Grid Connection Considering Electricity Price Constraint," Sustainability, MDPI, vol. 12(18), pages 1-28, September.
    5. Thanh Van Nguyen & Kyeong-Hwa Kim, 2019. "Power Flow Control Strategy and Reliable DC-Link Voltage Restoration for DC Microgrid under Grid Fault Conditions," Sustainability, MDPI, vol. 11(14), pages 1-27, July.
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