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Multi-Port DC-DC and DC-AC Converters for Large-Scale Integration of Renewable Power Generation

Author

Listed:
  • Fahad Alsokhiry

    (Renewable Energy Research Group and Department of Electrical and Computer Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia)

  • Grain Philip Adam

    (NEOM.com, An Nakheel, Riyadh 11564, Saudi Arabia)

Abstract

Numerous research studies on high capacity DC-DC converters have been put forward in recent years, targeting multi-terminal medium-voltage direct current (MVDC) and high-voltage direct current (HVDC) systems, in which renewable power plants can be integrated at both medium-voltage (MV) and high-voltage (HV) DC and AC terminals; hence, leading to complex hybrid AC-DC systems. Multi-port converters (MPCs) offer the means to promote and accelerate renewable energy and smart grids applications due to their increased control flexibilities. In this paper, a family of MPCs is proposed in order to act as a hybrid hub at critical nodes of complex multi-terminal MVDC and HVDC grids. The proposed MPCs provide several controllable DC voltages from constant or variable DC or AC voltage sources. The theoretical analysis and operation scenarios of the proposed MPC are discussed and validated with the aid of MATLAB-SIMULINK simulations, and further corroborated using experimental results from scale down prototype. Theoretical analysis and discussions, quantitative simulations, and experimental results show that the MPCs offer high degree of control flexibilities during normal operation, including the capacity to reroute active or DC power flow between any arbitrary AC and DC terminals, and through a particular sub-converter with sufficient precision. Critical discussions of the experimental results conclude that the DC fault responses of the MPCs vary with the topology of the converter adopted in the sub-converters. It has been established that a DC fault at high-voltage DC terminal exposes sub-converters 1 and 2 to extremely high currents; therefore, converters with DC fault current control capability are required to decouple the healthy sub-converters from the faulted one and their respective fault dynamics. On the other hand, a DC fault at the low-voltage DC terminal exposes the healthy upper sub-converter to excessive voltage stresses; therefore, sub-converters with bipolar cells, which possess the capacity for controlled operation with variable and reduced DC voltage over wide range are required. In both fault causes, continued operation without interruption to power flow during DC fault is not possible due to excessive over-current or over-voltage during fault period; however, it is possible to minimize the interruption. The above findings and contributions of this work have been further elaborated in the conclusions.

Suggested Citation

  • Fahad Alsokhiry & Grain Philip Adam, 2020. "Multi-Port DC-DC and DC-AC Converters for Large-Scale Integration of Renewable Power Generation," Sustainability, MDPI, vol. 12(20), pages 1-21, October.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:20:p:8440-:d:427432
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    References listed on IDEAS

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    1. Hao Wang & Yue Wang & Guozhao Duan & Weihao Hu & Wenti Wang & Zhe Chen, 2017. "An Improved Droop Control Method for Multi-Terminal VSC-HVDC Converter Stations," Energies, MDPI, vol. 10(7), pages 1-13, June.
    2. Sungchul Hwang & Sungyoon Song & Gilsoo Jang & Minhan Yoon, 2019. "An Operation Strategy of the Hybrid Multi-Terminal HVDC for Contingency," Energies, MDPI, vol. 12(11), pages 1-22, May.
    3. Affam, Azuka & Buswig, Yonis M. & Othman, Al-Khalid Bin Hj & Julai, Norhuzaimin Bin & Qays, Ohirul, 2021. "A review of multiple input DC-DC converter topologies linked with hybrid electric vehicles and renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    4. C. Anuradha & N. Chellammal & Md Saquib Maqsood & S. Vijayalakshmi, 2019. "Design and Analysis of Non-Isolated Three-Port SEPIC Converter for Integrating Renewable Energy Sources," Energies, MDPI, vol. 12(2), pages 1-32, January.
    5. Xiaohe Wang & Liang Chen & Dan Sun & Li Zhang & Heng Nian, 2019. "A Modified Self-Synchronized Synchronverter in Unbalanced Power Grids with Balanced Currents and Restrained Power Ripples," Energies, MDPI, vol. 12(5), pages 1-18, March.
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    Cited by:

    1. Maysam Abbasi & Ehsan Abbasi & Li Li & Behrouz Tousi, 2021. "Design and Analysis of a High-Gain Step-Up/Down Modular DC–DC Converter with Continuous Input Current and Decreased Voltage Stress on Power Switches and Switched-Capacitors," Sustainability, MDPI, vol. 13(9), pages 1-19, May.
    2. Stefano Bifaretti & Vincenzo Bonaiuto & Sabino Pipolo & Cristina Terlizzi & Pericle Zanchetta & Francesco Gallinelli & Silvio Alessandroni, 2021. "Power Flow Management by Active Nodes: A Case Study in Real Operating Conditions," Energies, MDPI, vol. 14(15), pages 1-16, July.

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