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Descriptor system observer-based state-of-charge estimation for batteries
Pages: 94-98
Year: Issue:  1
Journal: Electric Machines and Control

Keyword:  descriptor systemobserverbatterystate of charge;
Abstract: A new method for battery state-of-charge ( SOC) estimation was proposed. To avoid the diffi-culties in treating the piecewise linear relationship between the open-circuit voltage ( OCV) of the battery and the SOC, the popular approach for the observer design is to take the time derivative of the equation of the output voltage. It shows that the design of the observer by taking the time derivative of the voltage e-quation is incorrect. It is pointed out that the piecewise linear relationship can be considered as a linear constraint of a descriptor system. So the descriptor system approach was proposed to cope with this piece-wise linear constraint. And the descriptor system observer was then designed. Simulation shows the effec-tiveness of the proposed method.
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