Masters Theses


"Multi-input power electronic converters (MIPEC) are increasingly gaining interest in the fields of renewable energy systems and hybrid electric vehicles (HEV). The main advantage of MIPECs is their ability to interface several energy sources and storage devices using a single power conversion stage. Therefore, they provide simpler control and smaller parts count. In this thesis, various aspects of the utilization of double-input (DI) converters in solar and HEV applications are explored. For instance, a DI buckboost topology is proposed for a photovoltaic (PV)/battery energy system. The converter is controlled in a way that maximum power is drawn from the PV array using maximum power point tracking (MPPT) techniques and the additional power is drawn from the battery while keeping the output voltage constant. The capability of MIPECs to process bi-directional power in battery/ultra-capacitor hybrid system is also investigated. In addition, in order to analyze system stability and to design optimal controllers, the small signal model of the DI buck converter is developed. The developed model can also be used for the implementation of different control strategies based on the particular application. In order to effectively share power in a DI buck converter, two new control methods called the coupling control and the dead-time control have been proposed. It has been proven analytically and through small signal analysis that these methods have better dynamic performance compared to conventional methods. Power sharing in a DI buckboost converter using the offset-time control method has been implemented and experimentally verified where the offset-time between the switch commands is controlled to achieve effective power sharing"--Abstract, page iii.


Ferdowsi, Mehdi

Committee Member(s)

Chowdhury, Badrul H.
Kimball, Jonathan W.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2010


x, 101 pages

Note about bibliography

Includes bibliographical references (pages 46-47).


© 2010 Venkata Anand Kishore Prabhala, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

DC-to-DC converters
Electric current converters -- Design

Thesis Number

T 9681

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