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Stability improvement of DC grids involving a large number of parallel solar power optimizers: An active damping approach

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  • Mahdavyfakhr, Mohammad
  • Rashidirad, Nasim
  • Hamzeh, Mohsen
  • Sheshyekani, Keyhan
  • Afjei, Ebrahim

Abstract

This paper aims to address a new challenge associated with parallel operation of a large number of solar power optimizers in dc power grids. It is first shown that as the number of solar power optimizers increases the stability margin of the host dc power grid decreases. Then, to circumvent the stability problem, a novel active damping approach is presented which can improve the stability of dc grids dominated by a large number of solar power optimizers. In this approach, an inner feedback loop is added to the control system of a voltage source dc-dc converter regulating the dc grid voltage. The feedback transfer function is properly tuned to achieve the highest stability margin of dc grid. The presented approach works robustly for any number of solar power optimizers. Different simulation results are provided to confirm the effectiveness of the proposed approach.

Suggested Citation

  • Mahdavyfakhr, Mohammad & Rashidirad, Nasim & Hamzeh, Mohsen & Sheshyekani, Keyhan & Afjei, Ebrahim, 2017. "Stability improvement of DC grids involving a large number of parallel solar power optimizers: An active damping approach," Applied Energy, Elsevier, vol. 203(C), pages 364-372.
    • Handle: RePEc:eee:appene:v:203:y:2017:i:c:p:364-372
    DOI: 10.1016/j.apenergy.2017.06.044
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    Cited by:

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    2. Wang, Qin & Yao, Wei & Fang, Jiakun & Ai, Xiaomeng & Wen, Jinyu & Yang, Xiaobo & Xie, Hailian & Huang, Xing, 2020. "Dynamic modeling and small signal stability analysis of distributed photovoltaic grid-connected system with large scale of panel level DC optimizers," Applied Energy, Elsevier, vol. 259(C).
    3. Wang, Ruiting & Feng, Wei & Xue, Huijie & Gerber, Daniel & Li, Yutong & Hao, Bin & Wang, Yibo, 2021. "Simulation and power quality analysis of a Loose-Coupled bipolar DC microgrid in an office building," Applied Energy, Elsevier, vol. 303(C).
    4. Van den Broeck, Giel & Stuyts, Jeroen & Driesen, Johan, 2018. "A critical review of power quality standards and definitions applied to DC microgrids," Applied Energy, Elsevier, vol. 229(C), pages 281-288.
    5. Carlos Roldán-Porta & Carlos Roldán-Blay & Guillermo Escrivá-Escrivá & Eduardo Quiles, 2019. "Improving the Sustainability of Self-Consumption with Cooperative DC Microgrids," Sustainability, MDPI, vol. 11(19), pages 1-22, October.
    6. Yaghoobi, Jalil & Islam, Monirul & Mithulananthan, Nadarajah, 2018. "Analytical approach to assess the loadability of unbalanced distribution grid with rooftop PV units," Applied Energy, Elsevier, vol. 211(C), pages 358-367.

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