Optimal scheduling of time-shiftable electric loads in expeditionary power grids
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Authors
Sprague, John G.
Subjects
expeditionary
energy
optimization
deferrable
fuel
mixed integer linear program
energy
optimization
deferrable
fuel
mixed integer linear program
Advisors
Craparo, Emily M.
Date of Issue
2015-09
Date
Sep-15
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
Environmental control on the battlefield enhances readiness, reduces casualties, and protects the sensitive equipment upon which U.S. doctrine relies. Purchase and delivery of fuel necessary to provide this service was responsible for an estimated $1.4 billion in costs and 33 resupply convoy casualties per year at the peak of U.S. wars in Iraq and Afghanistan. It is well understood that the current semi-autonomous mode of environmental control unit (ECU) operation results in gener-ators operating at low average loads—and low fuel efficiency—to accommodate periodic unmanaged spikes in peak load.We propose a mechanism to reduce costs through optimal prescriptive management of these ECUs. We exploit the fact that ECU operation is time-shiftable to develop a mixed-integer linear programming (MILP) model that optimally schedules ECUs to eliminate unmanaged peak demand, reduce generator peak-to-average power ratios, and facilitate a persistent shift to higher fuel efficiency. Using sensitivity analysis, we quantitatively demonstrate how grid composition, temperature band tolerance, and energy storage capabilities contribute to fuel efficiency under this approach.
Type
Thesis
Description
Reissued 14 Jan 2019 with corrections to equations 4.12, 4.18
Series/Report No
Department
Operations Research
Organization
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NPS Report Number
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.