A Sliding Surface Design for Robust Load-frequency Control in Power Systems

One of the main characteristics of sliding mode control is system´s in variance to matched uncertainties once the state is on the sliding surface. This paper presents a robust sliding surface design method which decreases the influence of unmatched uncertainties to system behavior. Design is based on H_infin norm and convex optimization approach via linear matrix inequalities. Sliding surface design and simulations are done on a power system model consisting of three interconnected control areas.