個別インバータインピーダンスを用いた異メーカ系統連系インバータ間に発生する次同期振動の特定と対策

カテゴリ：部門大会

論文No：015

グループ名：【B】令和7年電気学会電力・エネルギー部門大会

発行日：2025/9/5

タイトル(英語)：Identification and Mitigation of Sub-Synchronous Oscillations among Multi-Vendor Grid-Connected Inverters Using Individual Inverter Impedances

著者名：吉川涼太（関西学院大学），松井和海（関西学院大学），井手智也（関西学院大学/東洋大学），小野晋也（東光高岳），杉本和繁（川崎重工業），平瀬祐子（関西学院大学）

著者名(英語)： Ryota Yoshikawa (Kwansei Gakuin University), Katsumi Matsui (Kwansei Gakuin University), Tomoya Ide (Toyo University), Shinya Ono (TAKAOKA TOKO CO., LTD.), Kazushige Sugimoto (Kawasaki Heavy Industries, Ltd.), Yuko Hirase (Kwansei Gakuin University)

キーワード：安定性評価,インピーダンスベース解析,系統連系インバータ,Stability assessment,Impedance-based analysis,Grid-connected inverters

要約(日本語)：Addressing instability in power systems with grid-connected inverters has become an urgent issue. In general, the control schemes of individual inverters are proprietary and not publicly disclosed, making it practically difficult to assess system stability using conventional approaches that rely on constructing a detailed mathematical model of the entire grid. Recently, impedance-based analysis methods—where system stability is evaluated solely from measured impedance characteristics—have garnered significant attention. However, these methods typically require the injection of small perturbation signals to excite resonant responses, which may pose safety and feasibility concerns depending on the system configuration and operating conditions. To address these limitations, this study proposes an alternative approach in which the impedance of each inverter is measured individually while it operates stably when connected to a commercial grid, thereby avoiding direct perturbation of the target system. Based on these impedance measurements, the stability of the overall system is assessed analytically. Moreover, it is quantitatively demonstrated that appropriate adjustment of inverter control parameters leads to an improvement in the stability obtained through this method.

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