Implementation of the load frequency control by two approaches: variable gain super-twisting algorithm and super-twisting-like algorithm

In this paper we explore a variable gain super-twisting algorithm and super-twisting-like algorithm for the load frequency control of two-area interconnected power system with nonlinearities. The two-area system is based on two different kinds of turbine. The nonlinearities are contained in this model. The control objective is to adjust the area control error (ACE), frequency deviation and tie-line power deviation to zero. We also prove the convergence of the proposed two control methods. Additionally, the traditional super-twisting algorithm is designed and simulated. Finally, simulation results are discussed and in comparison with the traditional super-twisting algorithm, which shows the superiority of the proposed two methods.