Designing of robust frequency stabilization using optimized MPC-(1+PIDN) controller for high order interconnected renewable energy based power systems

The challenge of controlling frequency becomes greater as the complexity of a power network increases. The stability of a power system is highly dependent upon the robustness of the controller. This paper presents automatic generation control (AGC) of a four-area interconnected power system along with integrated renewable energy sources of PV and wind energy. The designed model is a challenge given the increased penetration levels of PV and wind along with a thermal-hydropower system. The addition of a hydropower system as a fourth type results in the pole of the open loop system of the hydropower system being located at the right half side of the s-plan. This demands a robust control. A novel MPC-(1 + PIDN) is designed for high-order interconnected areas (HOIA) to stabilize the frequency in a robust way. The salp swarm algorithm is adopted to optimize the parameters of the PIDN controller. The performance of the proposed controller under HOIA is tested in a unbalanced load environment with uncertainty in the power system. The proposed controller can effectively handle the frequency disruption by stabilizing it in \(0.86 s\) for Area-1, \(1.08 s\) for Area-2, \(0.81 s\) for Area-3, and \(0.84 s\) for Area-4 with an average time of \(0.89 s\) for all the areas, whereas the average time for GWO: PI-PD, MPC/PI and GA-PI is \(3.48 s\), \(10.36 s\) and \(18.47 s\), respectively. The results demonstrate the effectiveness of the controller when compared to other controllers.