太陽光発電からの大規模な逆潮流に起因する配電系統の電圧制御に関する課題と解決技術

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  • 飯岡 大輔
    東北大学大学院工学研究科 電気エネルギーシステム専攻

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  • Technical Issues of Voltage Regulation in Distribution System with Large Reverse Power Flow from Photovoltaic Systems and its Solutions
  • タイヨウコウ ハツデン カラ ノ ダイキボ ナ ギャクチョウリュウ ニ キイン スル ハイデン ケイトウ ノ デンアツ セイギョ ニ カンスル カダイ ト カイケツ ギジュツ

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<p>This paper describes measurements, causes, and countermeasures of voltage reduction, spread of voltage unbalance, and voltage flicker, which are technical issues of voltage regulation in distribution system in recent years. The voltage measured in the distribution feeder with large reverse power flow from photovoltaic systems is explained by relationship between voltage rise by active power and voltage reduction by reactive power. The spread of voltage unbalance, which is also related to the large reverse power flow, is caused by unbalanced mutual impedance of three-phase distribution wires arranged horizontally or vertically. Frequency feedback method with step injection of reactive power, which is one of islanding detections installed into PCS, is attributed to voltage flicker in the distribution system.</p>

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