Fixed Frequency Sliding Mode Control of Distributed Generation in Microgrids for the Balanced and Nonlinear Loads

This paper proposes a novel control system integrating sliding mode control (SMC) with a lock-in amplifier (LA) to enhance the stability and power sharing precision in microgrids (MGs) with distributed generation (DG) units. The control system effectively mitigates harmonic distortions and maintains voltage amplitude and frequency under dynamic load conditions. The LA assists in extracting desired signals amidst noise, facilitating harmonic compensation in the inverter's control input signals. The proposed control system, tested under various conditions, demonstrated significant improvements in power quality, demonstrating reduced total harmonic distortion (THD) in comparison to existing methods, aligning with IEEE Std 519 standards.