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A modeling toolkit for comparing AC vs. DC electrical distribution efficiency in buildings

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dc.contributor.authorOthee, Avpreet, author
dc.contributor.authorCale, James, advisor
dc.contributor.authorYoung, Peter, committee member
dc.contributor.authorHerber, Daniel, committee member
dc.contributor.authorJia, Gaofeng, committee member
dc.date.accessioned2021-09-06T10:26:06Z
dc.date.available2021-09-06T10:26:06Z
dc.date.issued2021
dc.description.abstractAn increasing proportion of electrical devices in residential and commercial buildings operate from direct current (DC) power sources. In addition, distributed power generation systems such as solar photovoltaic (PV) and energy storage natively produce DC power. However, traditional power distribution is based on an alternating current (AC) model. Performing the necessary conversions between AC and DC power to make DC devices compatible with AC distribution results in energy losses. For these reasons, DC distribution may offer energy efficiency advantages in comparison to AC distribution. However, reasonably fast computation and comparison of electrical efficiencies of AC-only, DC-only, and hybrid AC/DC distributions systems is challenging because DC devices are typically (nonlinear) power-electronic converters that produce harmonic content. While detailed time-domain modeling can be used to simulate these harmonics, it is not computationally efficient or practical for many building designers. To address this need, this research describes a toolkit for computation of harmonic spectra and energy efficiency in mixed AC and DC electrical distribution systems, using a Harmonic Power Flow (HPF) methodology. The toolkit includes a library of two-port linear and nonlinear device models which can be used to construct and simulate an electrical distribution system. This dissertation includes a description of the mathematical theory and framework underlying the toolkit, development and fitting of linear and nonlinear device models, software implementation in Modelica, verification of the toolkit with laboratory measurements, and discussion of ongoing and future work to employ the toolkit to a variety of building designs.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.identifierOthee_colostate_0053A_16693.pdf
dc.identifier.urihttps://hdl.handle.net/10217/233816
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2020-
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectelectrical distribution modeling
dc.subjectharmonic power flow
dc.subjectsystems modeling and simulation
dc.subjectharmonic analysis
dc.subjectbuilding efficiency analysis
dc.subjectModelica
dc.titleA modeling toolkit for comparing AC vs. DC electrical distribution efficiency in buildings
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineSystems Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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