Robust variable structure model following load frequency controller

A systematic procedure for design of variable structure model following load frequency controller for a single{area power system has been presented. The variable structure model following control (VSMFC) technique presented in this paper not only guarantees invariance to a class of parameter variations and disturbances but also possess other attractive features of variable structure systems (VSS) like robustness to unknown disturbances, simplicity in design, and reduced order dynamics when in sliding mode. The simulation result of the variable structure model following control strategy to load frequency control is presented by changing all parameters by 30% to 50% from their nominal values. These results show that systems performance is robust to parameter variations and disturbances.