"High-voltage energy storage systems, which employ large series strings of battery cells or ultracapacitors, can be found in many applications including the utility industry, power backup, and electric and hybrid vehicles. These vehicles need a power plant that is reliable and maintains integrity during the lifetime of the car. Battery and ultra-capacitor capacity imbalances stemming from manufacturing and ensuing driving environment and operational usage affect voltage levels, which must adhere to strict limits to ensure the safety of the driver. While balancing the voltages of the batteries will prevent any problems stemming from capacity mismatch, there are many ways to instantiate the solution. This thesis reviews, analyses, and classifies various existing charge equalization techniques including capacitive, inductive, and transformer storage methods.
In this thesis, a double-tiered capacitive shuttling technique is presented and applied to an idealized three-battery system simulation in order to balance the voltages. Parameters in the system are varied and their effects on the system determined. Simulation shows a substantial improvement in charge transport using the new topology. Experimental results verifying simulation are presented.
Many of the existing charge balancing techniques utilizing inductors as the charge storage unit require the use of a voltage sensing system to set the control system switching accordingly. This thesis introduces a new flyback-based converter to transfer energy between storage units; by placing a diode in series with the input to the converter, the need for a voltage sensing network is removed. This comes at the expense of a slight drop in efficiency and a change in the operating characteristics near the equalized voltage state. Analytical study near the equalization point is presented and simulation results are used to verify expected operational characteristics"--Abstract, page iii.
Wu, Cheng Hsiao
Carroll, Douglas R.
Electrical and Computer Engineering
M.S. in Electrical Engineering
University of Missouri--Rolla
ix, 63 pages
© 2006 Andrew Christian Baughman, All rights reserved.
Thesis - Restricted Access
Solar vehicles -- Power supply
Storage batteries -- Design and construction
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b5795683~S5
Baughman, Andrew, "New techniques in battery charge equalization" (2006). Masters Theses. 5934.
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