Accurate Impedance Model of a Grid-Connected Inverter for Small-Signal Stability Assessment in High-Impedance Grids

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カテゴリ: 論文誌(論文単位)グループ名: 【D】産業応用部門（英文）発行日: 2019/05/01タイトル(英語): Accurate Impedance Model of a Grid-Connected Inverter for Small-Signal Stability Assessment in High-Impedance Grids著者名: Tuomas Messo (Tampere University of Technology, Department of Electrical Energy Engineering), Roni Luhtala (Tampere University of Technology, Department of Automation and Hydraulics), Aapo Aapro (Ingersoll Rand), Tomi Roinila (Tampere University of Techno著者名(英語): Tuomas Messo (Tampere University of Technology, Department of Electrical Energy Engineering), Roni Luhtala (Tampere University of Technology, Department of Automation and Hydraulics), Aapo Aapro (Ingersoll Rand), Tomi Roinila (Tampere University of Technology, Department of Automation and Hydraulics)キーワード: DC-AC power converters，impedance，power conversion harmonics，renewable energy sources，stability analysis要約(英語): Power quality problems caused by grid-connected renewable energy inverters have been reported increasingly in recent literature. Excessive harmonics and interharmonics arise when the inverter starts to interact with the grid impedance. Small-signal impedance models have been proven to be useful tools to analyze the stability margins. However, in presented dq-domain models the grid voltage feedforward loop employed by the inverter is not included. To fill this gap, this paper presents a new impedance model, which includes the effect of feedforward, to analyze impedance-based stability in the presence of large grid impedance. The model was verified by impedance measurements from a laboratory prototype. The model gave accurate predictions of small-signal stability when the Nyquist stability-criterion was applied. Thus, the model can be used to re-shape the inverter impedance to avoid stability problems. The developed impedance model also provides a useful tool to monitor stability margins online, which necessitates adaptive impedance-shaping of grid-connected inverters.本誌: IEEJ Journal of Industry Applications Vol.8 No.3 （2019） Special Issue on “IPEC-Niigata 2018”本誌掲載ページ: 488-496 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/8/3/8_488/_article/-char/ja/ Show more