Offset-Free Model Predictive Control for the Power Control of Three-Phase AC/DC Converters

This paper describes an offset-free model predictive control (MPC) algorithm using a disturbance observer (DOB) to control the active/reactive powers of a three-phase AC/DC converter. The strategy of this paper is twofold. One is the use of DOB to remove the offset error, and the other is the proper...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2015-11, Vol.62 (11), p.7114-7126
Main Authors: Kim, Seok-Kyoon, Choi, Dae-Keun, Lee, Kyo-Beum, Lee, Young Il
Format: Article
Language:English
Subjects:
AC/DC converter
Converters
Electric converters
Errors
Indexes
Input constraint
Linear matrix inequalities
Mathematical models
MPC
Offsets
Optimization
Performance evaluation
Power tracking control
Predictive control
Reactive power
Stability criteria
Steady-state
Tracking errors
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Summary:This paper describes an offset-free model predictive control (MPC) algorithm using a disturbance observer (DOB) to control the active/reactive powers of a three-phase AC/DC converter. The strategy of this paper is twofold. One is the use of DOB to remove the offset error, and the other is the proper choice of the weighting matrices of a cost index to provide fast error decay with small overshoot. The DOB is designed to estimate the unknown disturbances of the ac/dc converter following the standard Luenberger observer design procedure. The proposed MPC minimizes a one-step-ahead cost index penalizing the predicted tracking error by performing a simple membership test without any use of numerical methods. A systematic way for choosing the weights of the cost index, which guarantees the global stability of the closed-loop system, is proposed. Use of the DOB eliminates the offset tracking errors in the real implementation. Using a 25-kW ac/dc converter, it is experimentally shown that the proposed MPC enhances the power tracking performance while considerably reducing the mutual interference of the active/reactive powers as well as the output voltage.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2015.2436353