An Improved SOC Control Strategy for Electric Vehicle Hybrid Energy Storage Systems

Kai Wang, Wanli Wang, Licheng Wang and Liwei Li
Additional contact information
Kai Wang: School of Electrical Engineering, Qingdao University, Qingdao 266071, China
Wanli Wang: School of Electrical Engineering, Qingdao University, Qingdao 266071, China
Licheng Wang: College of Information Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Liwei Li: School of Electrical Engineering, Qingdao University, Qingdao 266071, China

Energies, 2020, vol. 13, issue 20, 1-13

Abstract: In this paper, we propose an optimized power distribution method for hybrid electric energy storage systems for electric vehicles (EVs). The hybrid energy storage system (HESS) uses two isolated soft-switching symmetrical half-bridge bidirectional converters connected to the battery and supercapacitor (SC) as a composite structure of the protection structure. The bidirectional converter can precisely control the charge and discharge of the SC and battery. Spiral wound SCs with mesoporous carbon electrodes are used as the energy storage units of EVs. Under the 1050 operating conditions of the EV driving cycle, the SC acts as a “peak load transfer” with a charge and discharge current of 2 i sc ~3 i bat . An improved energy allocation strategy under state of charge (SOC) control is proposed, that enables SC to charge and discharge with a peak current of approximately 4 i bat . Compared with the pure battery mode, the acceleration performance of the EV is improved by approximately 50%, and the energy loss is reduced by approximately 69%. This strategy accommodates different types of load curves, and helps improve the energy utilization rate and reduce the battery aging effect.

Keywords: hybrid energy storage system; supercapacitor; energy allocation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/20/5297/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/20/5297/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:20:p:5297-:d:426645

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().