Open AccessRobust output voltage control of a high gain DC–DC converter under applied load and input voltage uncertainties
Author(s) -
Akhormeh Ahmad Reza Naderi,
Akhormeh Alireza Naderi,
Abbaszadeh Karim
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2020.0156
Subject(s) - control theory (sociology) , voltage , controller (irrigation) , forward converter , robust control , integrating adc , converters , computer science , boost converter , engineering , control system , control (management) , artificial intelligence , agronomy , biology , electrical engineering
In this study, using robust and adaptive approaches, two controllers are designed to compensate for the applied load and input voltage uncertainties of a high voltage gain dc–dc converter. These controllers are designed based on measuring only the output voltage of the converter. The permissible ranges of the uncertainties are calculated using dynamics equations analysis while practical limitations are considered. In the first approach, an input multiplicative uncertainty is considered for the model of the converter by linearisation of non‐linear equations as well as using permissible ranges of the uncertainty. Then, a robust H ∞ controller is designed. In the second approach, the converter model is considered as a first‐order dynamics model with the unknown parameters and an unknown additive term while a direct robust model reference adaptive controller is designed for it. Finally, the non‐linear equations of the converter are simulated and the performances of the controllers are compared with each other. The control methods are then implemented on a 200 W prototype of a converter for evaluating the simulations results.