Chattering free robust adaptive integral higher order sliding mode control for load frequency problems in multi-area power systems

The aim of the article is to design a chattering free robust adaptive integral higher order sliding mode control for load frequency problems in multi-area hydro power systems using decentralised variable structure control methodology. The proposed controller assures change in frequency in all the areas due to load disturbance converge to zero in finite time. Results are compared with the performances obtained using integral sliding mode control (ISMC) and integral higher order sliding mode control (IHOSMC). The proposed controller helps in achieving finite time convergence of change in frequency due to load disturbances with chattering free and smooth control signal as compared to that obtained using ISMC and IHOSMC. Performance of the controller is tested for plant considered with non-linearities in power system such as generation rate constraints and governor deadband. The proposed controller is also validated against random load disturbances and IEEE large bus system (39-bus system).