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Research on Low Voltage Ride through Control of a Marine Photovoltaic Grid-Connected System Based on a Super Capacitor

Author

Listed:
  • Shihao Wang

    (School of Naval Architecture, Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

  • Xujing Tang

    (School of Naval Architecture, Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    National Engineering Research Center for Water Transport Safety (WTS Center), Wuhan University of Technology, Wuhan 430063, China
    Key Laboratory of Marine Power Engineering & Technology (Ministry of Transport), Wuhan University of Technology, Wuhan 430063, China)

  • Xionghang Liu

    (School of Naval Architecture, Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

  • Chen Xu

    (School of Naval Architecture, Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

Abstract

With the increase of photovoltaic penetration rate, the fluctuation of photovoltaic power generation affects the reliability of ship power grids. Marine PV grid-connected systems with high penetration rates should generally have a low voltage ride-through capability. In the present paper, a strategy in which super capacitors are applied for energy storage in a marine photovoltaic grid-connected system is proposed, and an inverter adopts independent decoupling control of active and reactive currents to improve the LVRT capability of photovoltaic grid-connected systems. In addition, a comprehensive control strategy is also designed to control the supercapacitor, to regulate the active power through the control method of the voltage outer loop and the current inner loop, in order to maintain the DC bus voltage stability. At the same time, the inverter can increase the reactive power output to support the grid voltage. The advantage of this system is in smoothing the power imbalance in a short time, enhancing the low voltage ride-through capability of the photovoltaic grid-connected system, improving the power quality, and ensuring the safety and stability of the ship’s power grid. MATLAB/Simulink were employed to establish a ro-ro ship super capacitor–marine photovoltaic grid-connected power system model and to carry out simulation experiments by setting the grid voltage drop. The results show that when the grid voltage drops, the inverter adjusts the distribution of active and reactive power. The power factor drops from 1 to 0.77, and the effective value of the voltage drop increases from 150 V to 156 V, which proves that this strategy effectively reduces the depth of the grid voltage drop and improves the low voltage ride-through capability of the photovoltaic grid-connected system.

Suggested Citation

  • Shihao Wang & Xujing Tang & Xionghang Liu & Chen Xu, 2022. "Research on Low Voltage Ride through Control of a Marine Photovoltaic Grid-Connected System Based on a Super Capacitor," Energies, MDPI, vol. 15(3), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1020-:d:738138
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    References listed on IDEAS

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    1. Liu, Hongda & Zhang, Qing & Qi, Xiaoxia & Han, Yang & Lu, Fang, 2017. "Estimation of PV output power in moving and rocking hybrid energy marine ships," Applied Energy, Elsevier, vol. 204(C), pages 362-372.
    2. Crago, Christine L. & Koegler, Eric, 2018. "Drivers of growth in commercial-scale solar PV capacity," Energy Policy, Elsevier, vol. 120(C), pages 481-491.
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