Journal
IET CONTROL THEORY AND APPLICATIONS
Volume 7, Issue 16, Pages 1959-1968Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-cta.2013.0115
Keywords
asymptotic stability; closed loop systems; control system synthesis; convergence; DC-DC power convertors; nonlinear control systems; observers; PI control; predictive control; state feedback; voltage control; output-feedback model predictive controller; capacitor voltage regulation; nonlinear DC-DC converter; state-feedback MPC scheme; Luenberger-type observer gain; global exponential convergence; state estimation errors; output-feedback MPC scheme design; certainty equivalence; input constraints; capacitor voltage offset error elimination; PI controller; outer loop; load resistance variations; closed-loop performance
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Funding
- National Research Foundation of Korea (NRF)
- government of South Korea (MEST) [2010-0022103]
- National Research Foundation of Korea [2010-0022103] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, an output-feedback model predictive controller (MPC) is presented for capacitor voltage regulation on the basis of a non-linear DC/DC converter. The proposed output-feedback MPC scheme is constructed by combining a state-feedback MPC scheme with a Luenberger-type observer. The proposed MPC does not carry out any online optimisation. Although the converter model is non-linear, the proposed observer gain ensures global exponential convergence of the state estimation errors. On the basis of this observer, an output-feedback MPC scheme is designed by certainty equivalence. It is also shown that the capacitor voltage globally converges to its reference while fulfilling input constraints. In order to eliminate the capacitor voltage offset error, a PI controller is employed in the outer loop. The experiment results demonstrate that the closed-loop performance is satisfactory despite the load resistance variations.
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