Load Frequency Control for a Two-area Interconnected Power System by Using Sliding Mode Controller

This paper presents the usage of sliding mode Control algorithm for the load frequency control in power systems. A sliding mode based load frequency controller is applied to a two-area power system. Non-reheat and reheat Thermal turbines are distributed in these two areas respectively. The nonlinearities such as governor dead band and generation rate constraint are included in the block diagram of a power plant model. Our control goal is to regulate the load frequency error of the power system in the presences of different load changes and parameter variations. The sliding mode controller (SMC) is simulated on the two-area interconnected power system with nonlinearities. These simulation results shows the robustness of the sliding mode controller. And it also shows that frequency error and tie line power errors are converges to zero. The performance of sliding mode controller is compared with conventional PI controller, PID and fuzzy controllers. This comparisons shows that SMC is the most effective and insensitive to the parameter variations tan the other controllers.