H∞ CONTROL FOR BATTERY/SUPERCAPACITOR HYBRID ENERGY
STORAGE SYSTEM USED IN ELECTRIC VEHICLES

Bai, Zhifeng; Yan, Zengfeng; Wu, Xiaolan; Xu, Jun; Cao, Binggang

doi:2019.20.6.1287

International Journal of Automotive Technology > Volume 20(6); 2019 > Article

Electrical Vehicle

International Journal of Automotive Technology 2019;20(6): 1287-1296.
doi: https://doi.org/10.1007/s12239-019-0120-x

H∞ CONTROL FOR BATTERY/SUPERCAPACITOR HYBRID ENERGY STORAGE SYSTEM USED IN ELECTRIC VEHICLES

Zhifeng Bai¹, Zengfeng Yan¹, Xiaolan Wu¹, Jun Xu², Binggang Cao²

¹Xi’an University of Architecture and Technology
²Xi’an Jiaotong University

Corresponding Author. Xiaolan Wu , Email. wuxiaolan@xauat.edu.cn

ABSTRACT

This paper proposes a control strategy of a hybrid energy storage system (HESS) based on simplified 2th-order model. The HESS uses a bidirectional DC/DC converter to connect the supercapacitors (SC) with the battery. Two control objectives, the output current of the SC during the traction procedure and the charging current of the SC while regenerative braking, are regulated by using the DC/DC converter. Two H∞ controllers are designed to control the output and charging current of the SC to their reference values, which are generated by the energy management strategy (EMS). Experimental results show that the proposed control method achieves a satisfactory performance, including a low steady-state tracking error and high response speed when the load power varies in a wide range.

Key Words: Electric vehicle, Hybrid energy storage system (HESS), H∞ controller, Supercapacitor, Regenerative braking

TOOLS