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Improvement of Voltage Unbalance by Current Injection Based on Unbalanced Line Impedance in Distribution Network with PV System

Author

Listed:
  • Daisuke Iioka

    (Department of Electrical and Electronic Engineering, College of Engineering, Chubu University, Kasugai 487-8501, Japan)

  • Takahiro Fujii

    (Department of Electrical Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan)

  • Toshio Tanaka

    (Kyushu Electric Power Co., Inc., Fukuoka 815-8720, Japan)

  • Tsuyoshi Harimoto

    (Kyushu Electric Power Co., Inc., Fukuoka 815-8720, Japan)

  • Junpei Motoyama

    (Kyushu Electric Power Transmission and Distribution Co., Inc., Fukuoka 810-0004, Japan)

  • Daisuke Nagae

    (Kyushu Electric Power Transmission and Distribution Co., Inc., Fukuoka 810-0004, Japan)

Abstract

In this study, we have proposed a novel current injection determination method that improves the voltage unbalance based on the unbalanced line impedance in a distribution network with a large-capacity PV system. An increase in the unbalance of the distribution line voltage was observed owing to a large-scale reverse power flow. To visualize this phenomenon, the P-V curves were derived for each phase to indicate the increase in the voltage unbalance with respect to the reverse power flow. Based on the derived P-V curves, the effect of a current unbalance on the voltage unbalance was investigated. It was clarified that there is a current unbalance that can improve the voltage unbalance even if the line impedance is unbalanced. In other words, the current unbalance that can theoretically make the voltage unbalance zero could be expressed in terms of the symmetrical components of unbalanced line impedance. As an application of the proposed method, the effect of the mitigation of voltage unbalance was demonstrated by controlling single-phase reactors, whose numbers were determined by using the relationship between the unbalanced line current and unbalanced line impedance.

Suggested Citation

  • Daisuke Iioka & Takahiro Fujii & Toshio Tanaka & Tsuyoshi Harimoto & Junpei Motoyama & Daisuke Nagae, 2021. "Improvement of Voltage Unbalance by Current Injection Based on Unbalanced Line Impedance in Distribution Network with PV System," Energies, MDPI, vol. 14(23), pages 1-16, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:23:p:8126-:d:694744
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    References listed on IDEAS

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    4. Biying Ren & Xiangdong Sun & Shasha Chen & Huan Liu, 2018. "A Compensation Control Scheme of Voltage Unbalance Using a Combined Three-Phase Inverter in an Islanded Microgrid," Energies, MDPI, vol. 11(9), pages 1-15, September.
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