Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

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: 2023/09/01

タイトル(英語): Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

著者名: Takumi Yasuda (Nagaoka University of Technology), Kazunori Hasegawa (Kyushu Institute of Technology), Jun-ichi Itoh (Nagaoka University of Technology)

著者名(英語): Takumi Yasuda (Nagaoka University of Technology), Kazunori Hasegawa (Kyushu Institute of Technology), Jun-ichi Itoh (Nagaoka University of Technology)

キーワード: capacitance，equivalent series resistance (ESR)，modular multilevel converter (MMC)，monitoring，deterioration diagnosis

要約(英語): A cell capacitor is one of the most fragile components in a modular multilevel converter (MMC). Capacitance decreases and equivalent series resistance (ESR) increases, as the capacitor deteriorates. This paper proposes an online monitoring method for both the capacitance and ESR of the cell capacitors in an MMC without any additional components or operation. The proposed method measures the impedance of the cell capacitor not only at a low frequency but also at a switching sideband-frequency of the cell without current sensors for capacitor current. The high-frequency components around the switching frequency improve the estimation accuracy compared with the previous methods that measure only impedance at low frequencies. The experimental results confirm that the proposed method estimates the capacitance and ESR with errors of 3.1% and 8.8%, respectively.

本誌: IEEJ Journal of Industry Applications Vol.12 No.5 （2023）

本誌掲載ページ: 953-960 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/12/5/12_22009850/_article/-char/ja/