Power system stabilizer design based on model reference sliding mode controller

Due to nature of power systems, random load changes seen frequently have resulted in small magnitude and low frequency oscillations. These oscillations shall be damped appropriately to sustain stability of power systems. Power System Stabilizers (PSSs) added to excitation systems to enhance the damping of electric power system during low frequency oscillations.In this thesis, as a new approach to design of PSS, a discrete time model reference sliding mode controller (MR-SMC) based structure have been represented. In simulation studies for different operating points and system parameters, it has been seen that the proposed MR-SMC has better performance in terms of over-shoot and setting time compared to existed PSS structures such as, classical, LQR and SMC. In addition, it has been shown that the proposed approach is less insensitive to changes in system parameters and therefore it has robust property.