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Title
Japanese:ステップ注入付周波数フィードバック方式に起因する電圧フリッカの 発生周波数の考察 
English:Studyo n the Frequencyo fV oltageF licker Caused byth e FrequencyF eedback Method with StepI njection ofR eactive Power 
Author
Japanese: 竹島 暖智, 佐野 憲一朗, 岩月 秀樹, 武藤 貴昭.  
English: Harusato Takeshima, Kenichiro Sano, HidekiI watsuki, Takaaki Mutou.  
Language Japanese 
Journal/Book name
Japanese:電気学会研究会資料 電力系統技術研究会 
English: 
Volume, Number, Page vol. 2    no. PSE-25-027    pp. 89-94
Published date Jan. 2025 
Publisher
Japanese:電気学会 
English:IEE Japan 
Conference name
Japanese:電気学会 電力系統技術研究会 
English:Technical Meeting on Power Systems Engineering, IEE Japan 
Conference site
Japanese: 
English: 
Abstract This paper examines the oscillation frequency of the volage flicker caused by the frequency feedback method with step injection of reactive power. It has recently been reported that the oscillation frequency has shifted from around 6 Hz to around 3 Hz. This paper derives the transfer function of the inverter and the distribution system. Based on the open-loop transfer function of the system, it is demonstrated that the system becomes unstable around 6 Hz and 3 Hz. It is clarified that flicker occurs at the frequency at which the system becomes unstable. Furthermore, both 6-Hz flicker and 3-Hz flicker are caused by the same mechanism, but changes in line impedance and PLL parameters cause the flicker frequency to shift from 6 Hz to 3 Hz.

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