Optimal Voltage Control Technique Using Optimized PI Controller for the Stability of Islanded Microgrid System

The voltage deviation challenge associated with Islanded microgrid system terminal voltage usually impacts negatively on the stability of the Islanded microgrid. This occurs as a result of load variation conditions and the intermittency nature of distributed generation(DG) in the Islanded MG. T o curtail this effect and ensure the stability of the system for power quality improvement, an optimal voltage control technique can be employed to minimize this drawback on Islanded microgrid operations. This study utilized the Sine Cosine algorithm (SCA) to optimize the control gains of the PI controller for voltage deviation minimization in an Islanded microgrid. The SCA technique was implemented on modelled Islanded microgrid with two parallel-connected inverters. Stability analysis was carried out on the Islanded microgrid and voltage deviation, overshoot, settling time, and rise time was used as performance metrics. The simulation results that emerged from the MATLAB/Simulink are compared to the PSO technique established in the literature. The results reveal that the SCA optimized PI controller has achieved a voltage overshoot improvement of 21.6%. The results indicate that SCA optimized PI controller outperformed the PSO reported in the literature.