Scholarlink

This paper presents an integrated control strategy combining DC link voltage regulation through the DC-DC converter and reactive power injection for voltage recovery to boost the low voltage ride-through (LVRT) capability of grid-tied single-stage photovoltaic (PV) inverters. A DC-DC converter controller based on proportional integral (PI) controller is introduced to regulate the DC link voltage and mitigate over voltages caused by power imbalances. When the DC link voltage exceeds a threshold due to fault, the controller activates to maintain it within acceptable limits, safeguarding the system. For LVRT compliance, reactive power injection control strategies are integrated according to grid code requirements to provide voltage support during faults. Simulation results validate the controller’s performance in mitigating DC link over voltages, injecting reactive power to improve voltage sags, and facilitating smooth LVRT operation during and after grid disturbances for symmetrical faults.

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Integrated DC-Link Regulation and Reactive Power Injection Strategies for LVRT Compliance of Grid-Tied PV Systems

  • 会议论文

  • 发表日期：

    2025年

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  • Mokabbera Billah,
  • Shameem Ahmad,
  • Md. Rifat Hazari,
  • Abidur Rahman Sagor,
  • Tofael Ahmed,
  • Saad Mekhilef,
  • Mehdi Seyedmahmoudian,
  • Alex Stojcevski,
  • Obaid Alshammari

摘要

This paper presents an integrated control strategy combining DC link voltage regulation through the DC-DC converter and reactive power injection for voltage recovery to boost the low voltage ride-through (LVRT) capability of grid-tied single-stage photovoltaic (PV) inverters. A DC-DC converter controller based on proportional integral (PI) controller is introduced to regulate the DC link voltage and mitigate over voltages caused by power imbalances. When the DC link voltage exceeds a threshold due to fault, the controller activates to maintain it within acceptable limits, safeguarding the system. For LVRT compliance, reactive power injection control strategies are integrated according to grid code requirements to provide voltage support during faults. Simulation results validate the controller’s performance in mitigating DC link over voltages, injecting reactive power to improve voltage sags, and facilitating smooth LVRT operation during and after grid disturbances for symmetrical faults.