Multi-Model Based Internal Model Control Design for LFC with Uncertain Time-Delay

The interconnected power systems (IPS) are vulnerable because of sudden perturbations in the load, system parameters, and environmental variations, etc. In this IPS design, load frequency control (LFC) plays a very important role. It is observed that the conventional IMC design cannot be the best option in the case of the LFC problem of IPS in the presence of uncertain time delay or uncertain communication delay. In view of this, this paper focused on multi-modal-based internal model control (IMC) scheme for the design of a robust IMC controller for better closed-loop performance as well as disturbance rejection. This approach is based on the Multi-modal concept of T. Mustapha et al. In order to show the superiority of the proposed approach, the comparison has been done using well-known established IMC-based approaches on load frequency control, such as Saxena & Hote’s method, and W. Tan’s method. The performance measures such as integral error (IE), integral square error (ISE), integral absolute error (IAE), and integral time absolute error (ITAE) indicate the superiority of the proposed approach.