Reliability of DC-link capacitor in pulsed power supply for accelerator magnet

IF 3.6 1区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-08-29 DOI:10.1007/s41365-024-01470-w

Jie Wang, Da-Qing Gao, Wan-Zeng Shen, Hong-Bin Yan, Li-Jun Mao

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Abstract

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 \(^\circ \hbox {C}\). 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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加速器磁体脉冲电源中直流链路电容器的可靠性

脉冲磁体电源中广泛使用电容器来降低纹波电压、储存能量和减少功率变化。本研究对脉冲电源中的直流链路电容器进行了研究。通过推导 H 桥拓扑侧电容器电流的分析方法，计算出了电容器电流的均方根值，这有助于选择直流链路电容器。所提出的方法能快速、高精度地解决这一问题。为避免电容器电流测量中的结构损坏，提出了直流链路电容器的电流重构，并利用 FFT 变换计算了电容器的热点温度和温升。测试结果表明，计算和测量的温升误差在 1.5 \(^\circ \hbox {C}\)以内。最后，基于蒙特卡罗分析预测了直流链路电容器的使用寿命。所提出的方法可以评估加速器非隔离开关脉冲电源中直流链路电容器的可靠性，也适用于薄膜电容器。

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来源期刊

Nuclear Science and Techniques 物理-核科学技术

CiteScore

5.10

自引率

39.30%

发文量

141

审稿时长

5 months

期刊介绍： Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.