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Energies 2014, 7(5), 2874-2896; doi:10.3390/en7052874

A New Topology and Control Strategy for a Hybrid Battery-Ultracapacitor Energy Storage System

1,* , 2
1 School of Mechanical Engineering, National Key Laboratory of Vehicle Transmission, Beijing Institute of Technology, Beijing 100081, China 2 College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
* Author to whom correspondence should be addressed.
Received: 5 March 2014 / Revised: 8 April 2014 / Accepted: 10 April 2014 / Published: 29 April 2014
(This article belongs to the Special Issue Electrochemical Energy Storage—Battery and Capacitor)


This study investigates a new hybrid energy storage system (HESS), which consists of a battery bank and an ultra-capacitor (UC) bank, and a control strategy for this system. The proposed topology uses a bi-directional DC-DC converter with a lower power rating than those used in the traditional HESS topology. The proposed HESS has four operating modes, and the proposed control strategy chooses the appropriate operating mode and regulates the distribution of power between the battery bank and the UC bank. Additionally, the control system prevents surges during mode switching and ensures that both the battery bank and the bi-directional DC-DC converter operate within their power limits. The proposed HESS is used to improve the performance of an existing power-split hybrid electric vehicle (HEV). A method for calculating the parameters of the proposed HESS is presented. A simulation model of the proposed HESS and control strategy was developed, and a scaled-down experimental platform was constructed. The results of the simulations and the experiments provide strong evidence for the feasibility of the proposed topology and the control strategy. The performance of the HESS is not influenced by the power limits of the bi-directional DC-DC converter.
Keywords: hybrid energy storage system (HESS); battery; ultracapacitor (UC); control; parameter hybrid energy storage system (HESS); battery; ultracapacitor (UC); control; parameter
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Xiang, C.; Wang, Y.; Hu, S.; Wang, W. A New Topology and Control Strategy for a Hybrid Battery-Ultracapacitor Energy Storage System. Energies 2014, 7, 2874-2896.

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