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SIMPLIFIED APPROACHES FOR CONTROLLING DC-DC POWER CONVERTERS

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Author(s): M. M. ABDEL AZIZ | A. A. MAHFOUZ | D. M. KHORSHIED

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 4;
Issue: 2;
Start page: 792;
Date: 2012;
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Keywords: MATLAB | VMC | PID | FLC | Buck converter.

ABSTRACT
This paper represents the design procedures of different compensation schemes for voltage mode controlled (VMC) dc–dc switching converters. Proportional integral derivative (PID) controllers, Fuzzy logic controllers (FLC), parallel combination of PID and FLC, and FLC tuned by PI controller have been investigated. MATLAB software is used to depict the buck converter performance with each compensator type when it is electrically simulated, and analytically modeled using its equivalent transfer function (TF). The comparative study Resultsemphasize that FLC tuned by PI controller is superior to the other control strategies because of fast transient response, minimum steady state error and good disturbance rejection under various variations of the operating conditions. Hence, it achieves the most tightly output voltage regulation.
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