期刊
IEEE TRANSACTIONS ON ENERGY CONVERSION
卷 26, 期 3, 页码 787-798出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2011.2129594
关键词
Battery model; linear algebraic equations; polynomials; Thevenin's equivalent circuit
资金
- National Science Foundation (NSF) [ECS-0621651, ECCS-0925269]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0925269] Funding Source: National Science Foundation
This paper derives simple and explicit formulas for computing the parameters of Thevenin's equivalent circuit model for a discharging battery. The general Thevenin's equivalent circuit model has n pairs of parallel resistors and capacitors (nth-order model). The main idea behind the new method is to transform the problem of solving a system of high-order polynomial equations into one of solving several linear equations and a single-variable nth-order polynomial equation, via some change of variables. The computation can be implemented with a simple MATLAB code less than half-page long. Experimental and computational results are obtained for three types of batteries: Li-polymer, lead-acid, and nickel metal hydride. For all the tested batteries, the first-order models are not able to generate voltage responses that closely match the measured responses, while second-order models can generate well-matched responses. For some of the batteries, a third-order model can do a better job matching the voltage responses.
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