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Look-up-table-based control of a three source DC-DC converter


A. Zigkiri

Semester Thesis, FS 13 (10262)

This semester thesis studies the control of a three source DC-DC converter topology. This topology allows DC sources to connect to DC busses with very different voltage levels and power to flow in multiple directions. The optimal modulation of this converter is a complex task, as the online computation of the optimal switching patterns is not possible. Therefore, in order to reduce the problem complexity, pre-computed periodic solutions are considered. However, the optimal modulation remains a complex problem, even with the assumption of periodicity conditions and it cannot be solved in real time. A solution would be to use a look-up-table strategy for the control of the three-source DC-DC converter, where pre-computed solutions for various operating points are stored. This strategy achieves good results but it has very high storage requirements. This semester thesis proposes a control approach of the converter based on a function that gives the close-to-optimal switching pattern. This is a function of the system parameters that can vary and it is obtained by fitting processes among various pre-computed results. The advantage of the proposed approach is that it achieves a close-to-optimal performance of the converter in real time, without using a look-up-table with high storage requirements. The results show that the proposed approach achieves good results both in high and low power transfer and the converter performance is improved by using a more complex function.


Type of Publication:

(13)Semester/Bachelor Thesis

C. Fischer

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2013:IFA_4548
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