Active disturbance rejection control for four-wire inverters in standalone renewable resources-based microgrid -...

Area of Science:

• Electrical Engineering
• Control Systems
• Renewable Energy Systems

Background:

• Standalone islanded microgrids rely on stable voltage source inverters.
• Conventional controllers face challenges with load disturbances and parameter uncertainties.
• Maintaining power quality in microgrids is crucial for reliable operation.

Purpose of the Study:

• To propose an active disturbance rejection control (ADRC) for three-phase four-leg voltage source inverters (FL-VSIs).
• To enhance control robustness against load disturbances, parameter uncertainties, and faulty conditions.
• To improve voltage waveform quality and adherence to power quality standards.

Main Methods:

• Implementation of an active disturbance rejection control (ADRC) strategy.
• Utilizing only output voltage sensors for feedback.
• Extensive simulations using Matlab/Simulink for validation.

Main Results:

• The proposed ADRC demonstrates improved control robustness compared to conventional PI controllers.
• Effective operation is achieved without requiring precise knowledge of disturbance characteristics or system parameters.
• Enhanced voltage waveform quality meeting power quality standards.

Conclusions:

• ADRC offers a robust and effective control solution for FL-VSIs in standalone microgrids.
• The approach simplifies control by not needing accurate system modeling.
• The method successfully improves power quality and resilience in microgrid applications.