Doctoral Dissertations

Keywords and Phrases

Fault detection; Gain scheduling; Generalized average modeling; Multi-domain modeling; Sensor placement; Small-signal modeling

Abstract

"This research examines two applications of control theory. The first application considers the bond graph (BG) modeling technique, which is used to develop the MATLAB structural analysis toolbox (MATSAT), an open-source toolbox for sensor placement and qualitative system analysis that considers the observability and fault-detection capabilities of multi-domain cyberphysical systems. The toolbox provides information on redundant sensors, guiding the system designer in cost and security trade-offs. The toolbox uses traditional BG causality assignment procedures. Additionally, MATSAT provides optimal causality assignment methods that perform significantly better at assigning causality to BGs with increased junctions, sources, and simple meshes, without encountering causality conflicts or creating causal loops.

The second application uses the extended generalized average method (EGAM) to study bidirectional AC-AC Dual Active Bridge (AC-AC DAB) converter dynamics at both the grid and switching frequencies. EGAM models tend to have a large number of state variables and are therefore only useful to represent complexity at the device level. After developing the EGAM model, a reduced-order EGAM (ROEGAM) model, which neglects transformer current dynamics and is phase-shift-dependent in steady state, is derived. A small-signal ROEGAM model is used to propose a controller with performance guarantees. EGAM and ROEGAM models are compared. The controller is implemented and validated in PLECS. Hardware results confirm real-time bidirectional regulation"-- Abstract, p. iv

Advisor(s)

Kimball, Jonathan W., 1973-
Bo, Rui

Committee Member(s)

McMillin, Bruce M.
Bristow, Douglas A.
Ferdowsi, Mehdi

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

2026

Journal article titles appearing in thesis/dissertation

Paper I: Structural Analysis of Multi-Domain Dynamic Systems Modeled Via Bond Graphs, found on Pages 9-40, has been published in IEEE Access.

Paper II: A bond graph optimal causality assignment method for structural analysis of simple-mesh bond graphs, Pages 41-69, is intended for submission to SIMULATION: Transactions of The Society for Modeling and Simulation International (SIM).

Paper III: Small-signal modeling and control of the ac-ac DAB converter via the extended generalized average method framework, found on Pages 70-107, is intended for submission to the IEEE Transactions in Power Electronics.

Pagination

xiii, 120 pages

Note about bibliography

Includes_bibliographical_references_(pages 113-118)

Rights

© 2026 Arnold Anthony Fernandes , All Rights Reserved

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12615

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