Three phase unbalance elimination in distribution system by optimal inverter dispatch of PCs

Hieu Xuan Nguyen*, Takao Tsuji, Tsutomu Oyama, Kenko Uchida

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    The increasing introduction of photovoltaic (PV) units into low voltage distribution system causes serious power quality issues, e.g. voltage variation and three phase voltage unbalance (VU) which limit the rating and number of further connections. Some conventional countermeasures such as on load tap changer, step voltage regulator, etc. have been applied to mitigate the voltage problems. However, these methodologies might not be enough to cope with PV output fluctuation due to the limitation in the number of tap changing operations or slow response of tap changers. On the other hand, it seems promising to use PV inverter control to solve the problems when PV units are allowed to inject or absorb reactive power. In particular, there is a possibility that PV inverter control can contribute to VU problem even if they are connected with low voltage single phase networks. This paper proposed a comprehensive inverter control strategy consisting of both reactive power control and active power curtailment to improve the operation performance of VU in medium voltage distribution network with high penetration of residential PV systems by minimizing network losses and active power curtailment with voltage quality constraints. The effectiveness of the proposed method was evaluated in consideration of solar insolation level which affects active power generation of PVs.

    Original languageEnglish
    Pages (from-to)13-26
    Number of pages14
    JournalIEEJ Transactions on Power and Energy
    Issue number1
    Publication statusPublished - 2019 Jan 1


    • Distribution system
    • Optimal power flow (OPF)
    • Photovoltaic (PV) system
    • Power quality
    • Reactive power control

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering


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