Robust control of DC-DC boost converter using 2-DOF 2-periodic controller

Abstract

From the mathematical model of the DC - DC boost converter it is evident that there exists a right half plane zero in its control-output transfer function. This work investigates whether a discrete time periodic controller can provide a superior robustness in controlling of DC-DC boost converter operating in continuous conduction mode (CCM) by virtue of its loop-zero placement capability. The problem considered is in the context of robust control of non-minimum phase (NMP) system, i.e system with unstable zero in its dynamics. The present works investigates whether it is possible to relocate non-minimum phase zero of fixed frequency boost converter operating in CCM. In this respect a 2-DOF, 2- Periodic controller is designed, that employs a systematic 2-stage algorithm involving linear algebraic steps, to verify the result. The effectiveness of the proposed controller is then evaluated and the improvements in transient behavior along with robustness are shown via simulation results.