Adaptive Terminal Sliding Mode Based Load Frequency Control for Multi-Area Interconnected Power Systems With PV and Energy Storage

In this paper, the load frequency control problem of multi-area interconnected power systems containing PV and energy storage system is considered. First, based on the traditional load frequency control model, the model of photovoltaic and energy storage system is established. Then, when the upper and lower bounds of disturbances are known, a fast terminal sliding mode controller is designed, which compensates the influence of disturbances effectively. Further, by introducing an adaptive law to estimate the bound of the unknown disturbances, an adaptive fast terminal sliding mode controller is designed, which reduces the dependence on the disturbance boundary. By designing the controller, the stability of the system is analyzed. Finally, simulations are performed with two area power systems to verify the effectiveness of the designed controller. The simulation results show that the adaptive fast terminal sliding mode controller can overcome the effects of disturbances. In addition, when the energy storage system and the controller participate in frequency regulation, the load frequency deviation fluctuation is further reduced, which enhances the performance of system.