Title page for ETD etd-06102011-170113


Type of Document Master's Thesis
Author Wen, Bo
Author's Email Address wenbo@vt.edu
URN etd-06102011-170113
Title Weight Estimation of Electronic Power Conversion Systems
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Boroyevich, Dushan Committee Chair
Mattavelli, Paolo Committee Member
Ngo, Khai D. T. Committee Member
Keywords
  • power converter
  • system architecture
  • power conversion system
  • Weight
Date of Defense 2011-05-02
Availability unrestricted
Abstract
Electronic power conversion systems with large number of power converters have a variety of applications, such as data center, electric vehicles and future smart “nanogrid” in residential home. Those systems could have very different architectures. For example, one system could be based on ac, dc or hybrid power distribution bus, and the bus voltage could be different. Also those systems have great need to develop low-cost architectures which reduce weight, increase efficiency and improve reliability of the system. However, how to evaluate different architectures and select a better one is still not clear.

This thesis presents a procedure to estimate weight of electronic power conversion systems, which provides an angle to evaluate different system architectures. This procedure has three steps. Step I, according to application of the system and system structure, determines the electrical and environmental specifications for each converter in the system. Step II studies the design procedures for each converter in the system and determines parameters such as the wire gauge and length of cable; the parameters of the passive components, such as inductance and capacitance; the parameters of the power switch, such as the voltage rating, current rating and loss; and parameters of the cooling system, such as the thermal resistance of the heat sink. Step III, according to the converters’ parameters, carry out the physical design and selection of sub-components such as the inductor and heat sink to get the components’ weight; the sum of those components’ weight is the estimated system weight. This procedure has also been implemented in the form of software – system weight estimation tool. Using this software, weight of sample systems with ac dc bus and two different bus voltages have been estimated and compared.

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