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Power Flow Control Strategy and Reliable DC-Link Voltage Restoration for DC Microgrid under Grid Fault Conditions

Author

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  • Thanh Van Nguyen

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

  • Kyeong-Hwa Kim

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

Abstract

In this paper, an effective power flow control strategy (PFCS) based on the centralized control method and a reliable DC-link voltage (DCV) restoration algorithm for a DC microgrid (DCMG) under grid fault conditions are proposed. Considering the relationship of supply-demand power and the statuses of system units, thirteen operating modes are presented to ensure the power balance in DCMG under various conditions. In the PFCS, the battery charging/discharging procedure is implemented considering the battery power limit to avoid overheating and damage. Moreover, load shedding and load reconnection algorithms are presented to maintain the system power balance, even in critical cases. To prevent the system power imbalance in DCMG caused by the delay of grid fault detection, a reliable DCV restoration algorithm is also proposed in this paper. In the proposed scheme, as soon as abnormal behavior of the DCV is detected, the battery or wind power generation system instantly enters a local emergency control mode to restore the DCV rapidly to the nominal value, regardless of the control mode assigned from the central controller. Comprehensive simulations and experiments based on the DCMG testbed are carried out to prove the effectiveness of the PFCS and the proposed DCV restoration algorithm.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:14:p:3781-:d:247171
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    Cited by:

    1. Thanh Van Nguyen & Kyeong-Hwa Kim, 2019. "An Improved Power Management Strategy for MAS-Based Distributed Control of DC Microgrid under Communication Network Problems," Sustainability, MDPI, vol. 12(1), pages 1-27, December.
    2. Muhammad Alif Miraj Jabbar & Dat Thanh Tran & Kyeong-Hwa Kim, 2023. "Decentralized Power Flow Control Strategy Using Transition Operations of DC-Bus Voltage for Detection of Uncertain DC Microgrid Operations," Sustainability, MDPI, vol. 15(15), pages 1-33, July.
    3. Faris Adnan Padhilah & Kyeong-Hwa Kim, 2021. "A Centralized Power Flow Control Scheme of EV-Connected DC Microgrid to Satisfy Multi-Objective Problems under Several Constraints," Sustainability, MDPI, vol. 13(16), pages 1-37, August.
    4. Yuri Bulatov & Andrey Kryukov & Konstantin Suslov, 2022. "Simulation of Power Router-Based DC Distribution Systems with Distributed Generation and Energy Storage Units," Energies, MDPI, vol. 16(1), pages 1-16, December.
    5. 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.
    6. Fazel Mohammadi, 2020. "Integration of AC/DC Microgrids into Power Grids," Sustainability, MDPI, vol. 12(8), pages 1-4, April.
    7. 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.
    8. 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.

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