Analysis of power quality based on real data and quality improvement at campus distribution system

Shoji Kawasaki, Junya Matsuki, Yasuhiro Hayashi, Akitoshi Ito

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    In recent years, a lot of equipments have been made using the inverter technology from home electric appliances to office automation apparatuses and industrial equipments with the development of power electronics technology. The voltage distortion of a distribution system has increased due to the harmonic currents generated from these apparatuses, and the increase in harmonics continues to be expected. In addition, the distribution system forms the circuit of harmonic distortion expansion by the prevalence of static capacitor without L for power factor improvement. Moreover, the voltage imbalance occurs by diversification of loads or imbalanced connection of single-phase loads. The deterioration of power quality in the distribution system causes various problems such as the overheating of equipments and malfunction of rotating machines. Since the power quality changes according to air temperature and date, it is desirable to measure the voltages and currents continuously for a long time. In this study, the authors focus attention on the distribution system in the University of Fukui campus, and the authors have measured the voltages and currents in the distribution system for a long period with WAMS (Wide Area Measurement System) using NCT (Network Computing Terminal). Based on the obtained data, the authors analyzed the power quality of the campus distribution system from viewpoints of voltage imbalance, current imbalance, voltage THD (Total Harmonic Distortion), and current THD. Furthermore, the improvement effect of power quality of the campus distribution system by exchange of single-phase load connection is described.

    Original languageEnglish
    JournalIEEJ Transactions on Power and Energy
    Volume129
    Issue number9
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    Power quality
    Harmonic distortion
    Electric potential
    Electric appliances
    Electric power system measurement
    Office automation
    Power electronics
    Deterioration
    Capacitors
    Networks (circuits)
    Air

    Keywords

    • Campus distribution system
    • Current imbalance rate
    • Current total harmonic distortion
    • Power quality
    • Voltage imbalance rate
    • Voltage total harmonic distortion
    • Wide area measurement system

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology

    Cite this

    Analysis of power quality based on real data and quality improvement at campus distribution system. / Kawasaki, Shoji; Matsuki, Junya; Hayashi, Yasuhiro; Ito, Akitoshi.

    In: IEEJ Transactions on Power and Energy, Vol. 129, No. 9, 2009.

    Research output: Contribution to journalArticle

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