An integrated optimization approach for a hybrid energy system in electric vehicles

Yi-xuan Hong, Chien Hsun Wu

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

This paper develops a simple but innovative integrated optimization approach (IOA) for deriving the best solutions of component sizing and control strategies of a hybrid energy system (HES) which consists of a lithium battery and a supercapacitor module. To implement IOA, a multiple for-loop structure with a preset cost function is needed to globally calculate the best hybridization and energy management of the HES. For system hybridization, the optimal size ratio is evaluated by maximizing the HES energy stored capacity at various costs. For energy management, the optimal power distribution combined with a three-mode rule-based strategy is searched to minimize the total consumed energy. Combining above two for-loop structures and giving a time-dependent test scenario, the IOA is derived by minimizing the accumulated HES power. Simulation results show that 6% of the total HES energy can be saved in the IOA case compared with the original system in two driving cycles: ECE and UDDS, and two vehicle weights, respectively. It proves that the IOA effectively derives the maximum energy storage capacity and the minimum energy consumption of the HES at the same time. Experimental verification will be carried out in the near future.

Original languageEnglish
Pages (from-to)479-490
Number of pages12
JournalApplied Energy
Volume98
DOIs
Publication statusPublished - 2012 Jan 1

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Keywords

  • Control strategy
  • Hybrid energy system
  • Lithium battery
  • Optimization
  • Supercapacitor
  • System design

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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