Adaptive Sliding Mode Control for Interconnected Power Systems Networks with Disturbances

In this paper, we present adaptive sliding mode-based load frequency control for interconnected electric power systems networks with the presence of disturbances. The design comprises a state and sliding mode feedback vector with robust and adaptive control terms to learn and compensate for disturbances. The disturbances in power networks may appear from load variations, modelling errors and other external fault disturbances. The power networks may also face additional disturbance from the changes in the power system structure for bilateral contracts between distribution and transmission companies for the future open and liberal electricity trading policy. The design and analysis are developed by using the Lyapunov method. It is shown in our analysis shows that the states of the power networks are bounded and their bounds asymptotically converge to zero in the Lyapunov sense. Compared with existing results, the proposed method does not require the exact bounds of the disturbances. The design is simple and easy to implement as it does not require the exact model of the interconnected power systems networks. Evaluation results on three-area power systems with extreme conditions are presented to illustrate the effectiveness of the proposed method for real-time applications.