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Synergistic Coordination Between PWM Inverters and DC-DC Converters for Power Quality Improvement of Three-Phase Grid-Connected PV Systems

Author

Listed:
  • Ali M. Eltamaly

    (Sustainable Energy Technology Center, King Saud University, Riyadh 11421, Saudi Arabia)

  • Zeyad A. Almutairi

    (Sustainable Energy Technology Center, King Saud University, Riyadh 11421, Saudi Arabia
    Mechanical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia)

Abstract

Grid-connected photovoltaic (PV) systems require a power converter to extract maximum power and deliver high-quality electricity to the grid. Traditional control methods, such as proportional-integral (PI) control for DC-link voltage regulation, often struggle under abnormal operating conditions, resulting in voltage fluctuations and instability in the maximum power point tracker (MPPT). This paper proposes a synergistic control strategy that combines a musical chairs algorithm (MCA) MPPT with sliding mode control (SMC) together for the boost converter DC-link control. This approach enhances DC-link voltage stability by switching the MPPT to SMC of the boost converter when the DC-link voltage exceeds the predefined limit. This strategy enhances the stability of the DC-link voltage and allows for a smaller DC-link capacitor, thereby reducing system cost and improving the power quality of PV systems. A phase-locked loop (PLL) further ensures effective grid synchronization. The reduction in DC-link voltage overshoot (from 570 V to 522 V) improved stability under varying irradiance conditions. Moreover, a 48 V reduction in overshoot voltage and a 66% decrease in DC-link voltage ripple (standard deviation from 17.93 V to 5.92 V) occurred. Simulation and experimental results demonstrate the superiority of the proposed strategy compared to the case without coordination between the DC-DC converter and inverter controllers, particularly under challenging conditions.

Suggested Citation

  • Ali M. Eltamaly & Zeyad A. Almutairi, 2025. "Synergistic Coordination Between PWM Inverters and DC-DC Converters for Power Quality Improvement of Three-Phase Grid-Connected PV Systems," Sustainability, MDPI, vol. 17(8), pages 1-20, April.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:8:p:3748-:d:1639144
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    References listed on IDEAS

    as
    1. Eltamaly, Ali M., 2021. "A novel musical chairs algorithm applied for MPPT of PV systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 146(C).
    2. Adel O. Baatiah & Ali M. Eltamaly & Majed A. Alotaibi, 2023. "Improving Photovoltaic MPPT Performance through PSO Dynamic Swarm Size Reduction," Energies, MDPI, vol. 16(18), pages 1-15, September.
    3. Hina Gohar Ali & Ramon Vilanova Arbos, 2020. "Chattering Free Adaptive Sliding Mode Controller for Photovoltaic Panels with Maximum Power Point Tracking," Energies, MDPI, vol. 13(21), pages 1-18, October.
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