Reliability of DC-link capacitor in pulsed power supply for accelerator magnet
作者机构：Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China
出 版 物：《NUCLEAR SCIENCE AND TECHNIQUES》 (核技术（英文）)
年 卷 期：2024年第35卷第9期
页 面：1-13页
核心收录：
学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0702[理学-物理学]
基 金：National Key Research and Development Program of China [2019YFA0405402]
主 题：Aluminum electrolytic capacitor DC-link current DC-DC power converter Hotspot temperature LIFETIME PREDICTION RMS CURRENT
摘 要：Capacitors are widely used in pulsed magnet power supplies to reduce ripple voltage, store energy, and decrease power variation. In this study, DC-link capacitors in pulsed power supplies were investigated. By deriving an analytical method for the capacitor current on the H-bridge topology side, the root-mean-square value of the capacitor current was calculated, which helps in selecting the DC-link capacitors. The proposed method solves this problem quickly and with high accuracy. The current reconstruction of the DC-link capacitor is proposed to avoid structural damage in the capacitor s current measurement, and the capacitor s hotspot temperature and temperature rise are calculated using the FFT transform. The test results showed that the error between the calculated and measured temperature increases was within 1.5 degrees C\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\circ \hbox {C}$$\end{document}. Finally, the lifetime of DC-link capacitors was predicted based on Monte Carlo analysis. The proposed method can evaluate the reliability of DC-link capacitors in a non-isolated switching pulsed power supply for accelerators and is also applicable to film capacitors.
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