Robust nonlinear sliding mode controllers for single-phase inverter interfaced distributed energy resources based on...

Area of Science:

• Electrical Engineering
• Control Systems
• Renewable Energy Integration

Background:

• Single-phase inverters are crucial for integrating distributed energy resources (DERs) into power systems.
• Maintaining stable inverter operation under varying load conditions and external disturbances is a significant challenge.
• Existing control strategies often struggle with robustness against parametric uncertainties and unpredictable load changes.

Purpose of the Study:

• To develop and evaluate novel robust controllers for single-phase inverters interfacing DERs.
• To enhance the stability and reliability of islanded and grid-connected inverter operations.
• To address limitations of current control methods in handling disturbances and uncertainties.

Main Methods:

• Implementation of a voltage control mode (VCM)-based super-twisting algorithm-sliding mode controller (STA-SMC) for islanded operation.
• Implementation of a current control mode (CCM)-based STA-SMC for grid-connected operation.
• Modeling external disturbances (load currents/voltages) and parametric uncertainties for comprehensive testing.
• Simulation studies using MATLAB/Simulink for single and multiple DER scenarios.

Main Results:

• The proposed STA-SMC controllers demonstrate superior robustness against external disturbances and parametric uncertainties.
• Both VCM-based and CCM-based controllers ensure stable inverter performance under diverse loading conditions.
• Comparative analysis confirms the enhanced performance of the proposed controllers over existing methods.

Conclusions:

• The developed STA-SMC controllers offer a robust and effective solution for single-phase inverter control in DER integration.
• The controllers provide reliable power quality and system stability for both islanded and grid-connected applications.
• This work advances control strategies for resilient and efficient integration of renewable energy sources.