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

    Abstract

    There is a danger of output suppression of high-penetration residential photovoltaic systems due to voltage increase. It is necessa1ry 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 nighttime 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)32-48
    Number of pages17
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Volume201
    Issue number2
    DOIs
    Publication statusPublished - 2017 Nov 1

    Fingerprint

    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

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

    Cite this

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    title = "Prevention of Output Suppression through Heat Pump Water Heaters for High-Penetration Residential PV Systems for Long-Term Operation",
    abstract = "There is a danger of output suppression of high-penetration residential photovoltaic systems due to voltage increase. It is necessa1ry 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 nighttime 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.",
    keywords = "distribution line, heat pump water heaters, high-penetration PV systems, output suppression, photovoltaic generation systems, voltage increase",
    author = "Yusuke Miyamoto and Yasuhiro Hayashi",
    year = "2017",
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    KW - output suppression

    KW - photovoltaic generation systems

    KW - voltage increase

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