A Comparative Study of Sliding Mode Observers

Abstract

In state space design, state feedback control is a powerful control technique. In state feedback control the Feedback of complete state vector gives the designer to have total control over the closed loop poles. Many times in state feedback control, all states are not available to feed back. To measure all unmeasurable states of the system the observer is needed. In real time system the system uncertainty will occur. So observer should estimate the state of the system in the presence of uncertainty. It is needed to control the system for which observer should be very robust to estimate the states of the system correctly. So here Utkin observer and Walcott zak observer`s are taken here. Their performances are compared to find the robustness against the system uncertainty. Utkin sliding mode observer has only the switching gain to minimize the observer error. But the Walcott-zak observer has static and nonlinear observer gain to minimize the observer error.
DOI: 10.17762/ijritcc2321-8169.150592