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Title:An average modeling approach of hybrid power systems for use in mobile refrigeration applications
Author(s):Cao, Yue
Advisor(s):Krein, Philip T.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Mobile refrigeration unit (MRU)
hybrid power systems
electric drives
lithium-ion batteries
average modeling
dynamic models
Abstract:This thesis presents averaging-based models of hybrid electric power systems for refrigeration units in delivery trucks. The background of the mobile refrigeration industry is stated, and the motivation of the proposed hybrid-powered ac motor drive is discussed. The model is intended to be used for an industry power and energy flow study and eventually for a development of product prototype. Challenges unique to this hybrid application, including the thermal system interface, drive cycle response, and battery management, are introduced. The system topology is presented, including the hybrid power architecture, electrical-thermal system specifications, and the integrated model operation and controls. The modeling approach for each electrical component, including ac machines, the battery set, and converters, is discussed. An average modeling technique is used because it models system-level power and efficiency over a long time interval with fast simulation. Battery simulation is improved from previous literature to provide a more accurate and robust solution. The model, interfaced with the thermal system, is verified by simulation studies in MATLAB/Simulink. A detailed model including transient response and harmonics gives a more accurate reading for power loss, at the cost of a slower simulation speed. It is not used directly for the industry study, but one detailed model is realized in Simulink/SimPowerSystems to validate the average model. The average model is also validated through experiments, including an active front end test, a battery test, and a variable speed ac motor drive test. Using the model, energy and cost-effectiveness are analyzed and discussed. Finally, the significance of the work is described and future improvements are suggested.
Issue Date:2013-08-22
Rights Information:Copyright 2013 Yue Cao
Date Available in IDEALS:2013-08-22
Date Deposited:2013-08

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