Title :
Design and analysis of a current-mode controlled battery/ultracapacitor hybrid
Author :
Liu, Shengyi ; Dougal, Roger A.
Author_Institution :
Dept. of Electr. Eng., South Carolina Univ., Columbia, SC, USA
Abstract :
This paper presents the design and analysis of a current-mode controlled battery/ultracapacitor hybrid operated with a pulsed power load. The system Ragone-type plot is constructed based on the steady-state analysis for power and efficiency design and optimization. The closed-loop control system is derived from a small-signal analysis for a compensator design to improve the steady-state accuracy and transient characteristics. The designed system allows the battery to be operated at a low-level constant current for a better cycle life, while the ultracapacitor, paralleled with the load, "free-wheels" a large current to enhance the power. The compensator is a simple proportional controller that can eliminate potential instabilities resulted from the high resistance mode of the battery.
Keywords :
cells (electric); closed loop systems; control system synthesis; electric current control; optimisation; pulsed power supplies; supercapacitors; Ragone-type plot; closed-loop control system; compensator design; current-mode controlled battery; optimization; pulsed power load; small-signal analysis; steady-state analysis; transient characteristics; ultracapacitor hybrid operation; Batteries; Capacitance; Circuits; Contracts; Control systems; Design optimization; Inductors; Steady-state; Supercapacitors; Voltage;
Conference_Titel :
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE
Print_ISBN :
0-7803-8486-5
DOI :
10.1109/IAS.2004.1348556
