Control Strategy for a DC/DC Buck Converter based on a Hamiltonian Model to suppress the Ripples at the Input stage
Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
AC/DC Buck converters have been used widely in many applications from cell phones to vehicle battery chargers. Due to their importance many researchers have been studying their behavior to improve their efficiency and reduce their size and/or cost. One of the most common defects of these converters, whether they are used for high power or low power applications, is the unwanted ripples in the input voltage across the input stage. It is believed that these ripples are caused by the interaction between the converter itself or its controller with the rectifier required to change the AC input into DC followed by an input filter. Many strategies have been suggested to tackle this problem. A new strategy to improve the controller of that converter was suggested by M. Lenells  and it was based on a Hamiltonian model for the 3-phase AC/DC converter together with its rectifier. As a first step, we simulated this model for a single-phase DC/DC buck converter only using the so-called S-Functions in MATLAB/SIMULINK. Then we could find a control law that would reduce the ripples in the input voltage and keep the output voltage constant simultaneously. In this report, we present this model and its simulation to pave the way for the control and simulation of the 3-phase AC/DC converter.
Place, publisher, year, edition, pages
2011. , 50 p.
Contol, Buck converters, Hamiltonian, S-functions, Input voltage ripples, Input filter, control law
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:lnu:diva-12111OAI: oai:DiVA.org:lnu-12111DiVA: diva2:421258
Subject / course
Electrical Engineering with specialisation in Signal Processing & Wave Propagation, Master Programme, 120 credits
2011-05-26, B3033, Linnaeus University, vaxjo, 15:15 (English)
Lenells, Matz, Dr.
Lenells, Matz, Dr.