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On the performance of fuel cell supercapacitor hybrid propulsion system for city bus use

Wu, Wei; (2018) On the performance of fuel cell supercapacitor hybrid propulsion system for city bus use. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

Fuel Cell (FC) buses have been developed as a long term zero emission solution for city transportation and they have now reached levels of maturity to supplement the coming London 2020 Ultra Low Emission Zone implementation. A critical review of previous research in this field has highlighted promising potential for FC technologies applied to bus applications and also identified the associated challenges. This research analysed the current FC bus industry and addressed the most recent trend of applying FCs with hybrid technologies for city buses. This research developed a scaled laboratory Fuel Cell and Supercapacitor hybrid drivetrain model for investigating the design and performance of a low emission propulsion systems for city bus applications in its dynamic environment. The laboratory system has been used to validate a computer model to ensure it is suitably representative of practical and full sized FC bus power systems. A novel hybrid control strategy was developed for a FC hybrid system and evaluated with actual bus driving cycles. The power balancing strategy between multiple power sources in the FC hybrid system has been explored and investigated. The key finding of this research is that hybridising the FC with an energy storage medium showed superior performance over FC only system. Additionally, existing FC hybrid buses generally have an over-sized FC on-board which significantly increases the capital cost. A series of steps have been identified to determine the required FC / energy storage degree of hybridisation. An optimised degree of hybridisation for FC hybrid bus can potentially improve the system performance, reduce the size of the FC on-board and propulsion system costs.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: On the performance of fuel cell supercapacitor hybrid propulsion system for city bus use
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10042832
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