Controller design for Cuk converter using model order reduction

Cuk converter contain two inductor and two capacitor hence it is fourth order dc-dc converter. It provides output voltage both higher as well as lower than the input voltage. Design of feedback compensator for fourth order system is quite complex. In this paper, model order reduction technique is used for controller design of Cuk converter. First small signal dynamic model for Cuk converter using state space analysis (SSA) is obtained which provides fourth order transfer function. Then this fourth order transfer function is reduced to second order using Pade approximation.