Frequency Regulation of Virtual Inertia Based Isolated Microgrid System Using Pelican Optimizer Based Fractional Order Proportional Integral - (1+PDF) Controller

This research presents a new load frequency controller tuned by recently developed Pelican Optimization Algorithm (POA) in virtual inertia based isolated microgrid involving of wind turbine, photovoltaic, and battery system with Phase locked loop (PLL) dynamics. In first stage, a fractional order of PI controller (FOPI) cascaded with 1 plus derivative filter based PD acronym as FOPI-(1+PDF) controller is proposed and compared with POA tuned PID, PI-PD, PI-PDF, PI-(1+PDF) and FOPI-PDF controllers for single step disturbance. Objective function used here is the integral of time multiplied absolute error (ITAE). The superiority of POA FOPI-(1+PDF) controller is witnessed over other controllers with single step disturbance for frequency regulation. In the second step, the ability of the proposed technique is established through its superior performance compared to other controllers for frequent step disturbances. Hence, proposed POA-tuned FOPI (1+PDF) controllers with improved dynamic response and the lowest ITAE (ITAE=1.9215), demonstrates its worthiness for frequency regulation of low inertia microgrid.