Date of Award

2025

Document Type

Open Access Dissertation

Department

Electrical Engineering

First Advisor

Kristen Booth

Abstract

DC distribution has enabled a variety of new features and opportunities for naval power systems. At the same time, pulsed loads are proliferating, and pose unique challenges to power systems, especially smaller systems like those onboard ships. Energy storage resources, including Battery Energy Storage Systems (BESS) and supercapacitors, can be used to compensate pulsed loads of varying frequencies with proper control. However, standard methods of frequency-based load allocation have only limited ability to integrate sources with diverse power and energy capabilities. To overcome this limitation, a new droop control scheme, Frequency Targeting Droop (FTDC), has been devised that increases the utilization of high frequency sources. Load sharing as a function of frequency of the new scheme has been investigated and validated.

Conventional methods of converter control design limit the effectiveness of power converters in responding to high frequency pulsed loads; to increase the efficacy of the new droop control scheme at serving pulsed loads, a new method of voltage control design for output impedance was created. The stability of the system under FTDC with the novel voltage control design is guaranteed using the Passivity Based Stability Criterion, and its efficacy is validated.

Fuel efficiency is an ever-present operational imperative for naval power systems, as increased fuel efficiency directly increases ship capability. With proper control, BESS can enable regenerative braking, permitting injected energy to be recaptured and efficiency to be increased.

To enable the capture of regenerated energy while ensuring BESS availability,

a novel decentralized Integrated Power System (IPS) controller has been created. Through a combination of system level output impedance control and source level controllers, a decentralized control system that facilitates source SoC regulation, regenerative energy management and overload support has been realized.

Rights

© 2025, Jack Elliott Hannum

Download

Share

COinS