Prevention of output suppression through heat pump water heaters for high-penetration residential PV systems for long-term operation

Yusuke Miyamoto, Yasuhiro Hayashi

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    There is a danger of output suppression of high-penetration residential PV systems due to voltage increase. It is necessary to install new technology to prevent the occurrence of such phenomenon. Therefore, we focused our attention on heat pump water heaters (HPWHs). HPWHs are usually used to heat water during night time because electricity prices are cheaper than during the daytime for the load leveling in Japan. So they can be used as a countermeasure without additional cost if they are operated during the daytime. However, HPWHs do not have sufficient capacity to absorb inverse energy at each residence. Thus HPWH operation must be optimized to minimize output suppression loss. In this research, we selected four typical sunny days in spring, summer, autumn and winter. The optimal HPWH operation was calculated by numerical simulation. The optimal monthly HPWH operation was investigated using the weather forecast assuming actual operation in each season.

    Original languageEnglish
    Pages (from-to)423-436
    Number of pages14
    JournalIEEJ Transactions on Power and Energy
    Volume135
    Issue number7
    DOIs
    Publication statusPublished - 2015 Jul 1

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    Water heaters
    Pumps
    Hot Temperature
    Electricity
    Computer simulation
    Electric potential

    Keywords

    • Distribution line
    • Heat pump water heaters
    • High-penetration PV systems
    • Output suppression
    • Photovoltaic generation systems
    • Voltage increase

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology

    Cite this

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    abstract = "There is a danger of output suppression of high-penetration residential PV systems due to voltage increase. It is necessary to install new technology to prevent the occurrence of such phenomenon. Therefore, we focused our attention on heat pump water heaters (HPWHs). HPWHs are usually used to heat water during night time because electricity prices are cheaper than during the daytime for the load leveling in Japan. So they can be used as a countermeasure without additional cost if they are operated during the daytime. However, HPWHs do not have sufficient capacity to absorb inverse energy at each residence. Thus HPWH operation must be optimized to minimize output suppression loss. In this research, we selected four typical sunny days in spring, summer, autumn and winter. The optimal HPWH operation was calculated by numerical simulation. The optimal monthly HPWH operation was investigated using the weather forecast assuming actual operation in each season.",
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    AU - Hayashi, Yasuhiro

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    KW - Output suppression

    KW - Photovoltaic generation systems

    KW - Voltage increase

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