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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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