In this article, the most recent technique for optimising structural components is discussed. This technique includes the Cascaded One Plus Proportional Integral (1+PI) controller with an Improved Grasshopper Optimization Algorithm-based Proportional Derivative (PD) controller for Automatic Generation Control (AGC) of the Power System. The thermal, hydro, and gas components, respectively, make up each individual control area. PID controllers are considered at the outset, and it has been shown that IGOA is more effective than Grasshopper Optimization Algorithm (GOA), Particle Swarm Optimization (PSO), and Genetic Algorithm (GA). The overshoots, undershoots, and other integral errors of frequency and tie-line power variances that occur after Step Load Perturbations (SLPs) are measured so that performance may be compared. Following that, PD cascaded with PI (PD-PI) and PD cascaded with One plus PI (PD-(1+PI)) controllers are considered, and IGOA approaches are used to improve controller settings. Finally, a Unified Power Flow Controller (UPFC) is investigated, and a comparison study is conducted using an IGOA tuned PD-(1+PI) controller in the presence of UPFC with PD-(1+PI) and PID controllers for various instances to demonstrate the superiority of the proposed controller.