Modeling and Control of Dual Active Bridge DC-DC Converter

  • Imran Syed

Student thesis: Master's Thesis

Abstract

This thesis deals with the rising use of DC systems and seeks to provide a solution to the different problems that are generally associated with such a system. With the increasing use of renewable energy sources like PV, fuel cells etc that are DC sources of supply and the rise of electronics based devices that run solely on DC power the setting up of DC systems is becoming more efficient and reliable. A large component of such a system is the DC-DC converters that are employed within them. These converters play an important role and can be used for a variety of purposes including controlling the power flow within the system. This thesis deals with one such converter called the Dual Active Bridge converter which is prevalently used today in applications like electric vehicles, solid state transformers etc. This work firstly provides a simple mathematical model as a solution to the problem of accurately deriving a mathematical model for the converter. This model is then verified experimentally by a prototype that has been built in the lab. The effectiveness and usefulness of such a model is then verified by designing a controller for the DAB using affine parameterization technique. Following the verification of the model, the application of the DAB in a DC microgrid is illustrated by simulating a small DC test system in MATLAB/SIMULINK. Concepts such as droop control are illustrated in this system and the distinct advantage of the DAB in helping to achieve the control of such a system without any current sensors is also illustrated.
Date of AwardJun 2013
Original languageAmerican English
SupervisorMichael Weidong Xiao (Supervisor)

Keywords

  • DC Systems
  • DC-DC Converters
  • Power Flow
  • Dual Active Bridge
  • Mathematical Model
  • DC Microgrid.

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