Power ramp rate capabilities of a 5 kW proton exchange membrane fuel cell system with discrete ejector control

Kaj Nikiforow (Corresponding Author), Jari Pennanen, Jari Ihonen, Sanna Uski, Pauli Koski

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    The power ramp rate capabilities of a 5 kW proton exchange membrane fuel cell (PEMFC) system are studied theoretically and experimentally for grid support service applications. The fuel supply is implemented with a fixed-geometry ejector and a discrete control solution without any anode-side pressure fluctuation suppression methods. We show that the stack power can be ramped up from 2.0 kW to 4.0 kW with adequate fuel supply and low anode pressure fluctuations within only 0.1 s. The air supply is implemented with a centrifugal blower. Air supply ramp rates are studied with a power increase executed within 1 and 0.2 s after the request, the time dictated by grid support service requirements in Finland and the UK. We show that a power ramp-up from 2.0 kW to 3.7 kW is achieved within 1 s with an initial air stoichiometry of 2.5 and within 0.2 s with an initial air stoichiometry of 7.0. We also show that the timing of the power ramp-up affects the achieved ancillary power capacity. This work demonstrates that hydrogen fueled and ejector-based PEMFC systems can provide a significant amount of power in less than 1 s and provide valuable ancillary power capacity for grid support services.

    Original languageEnglish
    Pages (from-to)30-37
    Number of pages8
    JournalJournal of Power Sources
    Volume381
    DOIs
    Publication statusPublished - 31 Mar 2018
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Air supply
    • Dynamic behavior
    • Ejector
    • Fuel supply
    • PEMFC system
    • Power ramp rate

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