• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2016 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2016 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Mixed-integer program for the design and dispatch of a hybrid power generation system, A

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Scioletti_mines_0052E_10995.pdf
    Size:
    3.378Mb
    Format:
    PDF
    Download
    Author
    Scioletti, Michael S.
    Advisor
    Newman, Alexandra M.
    Date issued
    2016
    Keywords
    battery
    energy
    hybrid system
    integer programming
    nonlinear programming
    optimization
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/170107
    Abstract
    Renewable energy technologies, specifically, solar photovoltaic cells, combined with battery storage and diesel generators, form a hybrid system capable of independently powering remote locations, i.e., those isolated from the grid. If sized correctly, hybrid systems reduce fuel consumption compared to generator-only alternatives. We present an optimization model to solve the hybrid power system design and dispatch problem for remote locations, modeling the acquisition of different power technologies as integer variables and their operation using nonlinear expressions. Our cost-minimizing, nonconvex, nonlinear, mixed-integer program contains a detailed set of battery-only constraints that (i) considers rate-capacity effects in assigning discharge current; (ii) calculates both voltage and lifetime as a function of state-of-charge and current; and (iii) adjusts rate-capacity and resistance parameters to temperature. We demonstrate that neglecting these characteristics, which is common to facilitate tractability of the problem, could lead to over-estimation of battery performance by as much as 30%. Due to the complexities of this model, we present symmetry reduction and linearizations, the latter of which includes exact and convex under-estimation techniques. Specifically, we demonstrate how to employ the convex envelope of a bilinear term as a relaxation to bound and solve the problem, and also how to tighten this relaxation by partitioning on one or both of these variables in the bilinear term. Although partitioning is computationally expensive, we demonstrate that by providing the solver with an initial feasible solution as a "warm-start," we are able to solve model instances in a reasonable amount of time. We determine, in a matter of hours, solutions within 5% of global optimality that closely resemble those from the nonlinear model. Our instances contain real data spanning a yearly horizon at hour fidelity and demonstrate that a hybrid system could reduce fuel consumption by as much as 50% compared to a generator-only solution.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2016 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.