Disturbance Observer-Based Offset-Free Global Tracking Control for Input-Constrained LTI Systems with DC/DC Buck Converter Applications

Kyunghwan Choi, Dong Soo Kim and Seok-Kyoon Kim
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Kyunghwan Choi: Center for Eco-Friendly & Smart Vehicles, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
Dong Soo Kim: Department of Creative Convergence Engineering, Hanbat National University, Daejeon 34158, Korea
Seok-Kyoon Kim: Department of Creative Convergence Engineering, Hanbat National University, Daejeon 34158, Korea

Energies, 2020, vol. 13, issue 16, 1-18

Abstract: This paper presents an offset-free global tracking control algorithm for the input-constrained plants modeled as controllable and open-loop strictly stable linear time invariant (LTI) systems. The contribution of this study is two-fold: First, a global tracking control law is devised in such a way that it not only leads to offset-free reference tracking but also handles the input constraints using the invariance property of a projection operator embedded in the proposed disturbance observer (DOB). Second, the offset-free tracking property is guaranteed against uncertainties caused by plant-model mismatch using the DOB’s integral action for the state estimation error. Simulation results are given in order to demonstrate the effectiveness of the proposed method by applying it to a DC/DC buck converter.

Keywords: offset-free global tracking control; input constraints; disturbance observer; LTI systems; DC/DC buck converters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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