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This study enhances grid-connected inverter control using linear active disturbance rejection control (LADRC) and PI controllers. The combined approach significantly reduces harmonic distortion, improving power quality for photovoltaic systems.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Grid-connected inverters require optimized dynamic performance for high-quality currents.
  • Harmonic distortion in grid currents can negatively impact power system stability and efficiency.

Purpose of the Study:

  • To improve the dynamic performance and harmonic suppression capabilities of single-phase photovoltaic grid-connected inverters.
  • To evaluate a novel control strategy combining reduced-order linear active disturbance rejection control (LADRC) and a Proportional-Integral (PI) controller.

Main Methods:

  • Implementation of a hybrid control strategy integrating LADRC with a PI controller.
  • Application of the proposed control strategy to a single-phase photovoltaic grid-connected system.
  • Validation through simulations and experimental testing.

Main Results:

  • Significant improvement in the suppression of grid harmonics.
  • Demonstrated robustness and disturbance rejection capabilities of the LADRC-based control system.
  • Substantial reduction in the Total Harmonic Distortion (THD) of grid-connected currents.

Conclusions:

  • The proposed LADRC and PI controller combination offers superior performance compared to traditional methods.
  • The control strategy effectively enhances power quality in photovoltaic grid-connected systems.
  • The approach is validated as effective and robust for real-world applications.