Journal
ENERGY
Volume 122, Issue -, Pages 601-612Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.01.098
Keywords
Electric city bus; Hybrid energy storage system (HESS); Sliding-mode controller; Lyapunov function-based controller; Supercapacitor
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Funding
- MoST (Ministry of Science and Technology of China) [2014DFG71590]
- National Key Technology Support Program [2015BAGO6B01]
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In this paper, the control strategy of a fully-active hybrid energy storage system, which uses two bidirectional DC/DC converters to decouple supercapacitor and battery pack from the DC bus, is proposed based on a 5th-order averaged model. Three control objectives, the battery and supercapacitor currents as well as the DC bus voltage, are regulated by using the two DC/DC converters. A Lyapunovfunction-based controller is proposed to regulate the DC bus voltage to its reference value. In addition, a sliding-mode controller is designed to control the battery and supercapacitor currents to their reference values. The battery current reference is generated by the energy management strategy, while the supercapacitor current reference is generated by the Lyapunov controller to ensure DC bus voltage regulation. Simulation and experimental results show that the proposed control method has satisfactory performance, including robust tracking and a smooth transition when the load power varies in the large range. (C) 2017 Elsevier Ltd. All rights reserved.
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