Research on stray inductance extraction method for large-size power capacitor

Stray inductance present in the commutation loop of converters significantly impacts power semiconductor devices. However, accurately extracting stray inductance from large-size power capacitors remains challenging. While the discharge method is the current standard extraction technique, it is unsui...

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Bibliographic Details
Published in机车电传动 pp. 26 - 33
Main Authors TAN Yifan, CHEN Yanping, DOU Zechun, QI Yu, XIE Shunmeng, YANG Lele
Format Journal Article
LanguageChinese
Published Editorial Department of Electric Drive for Locomotives 01.07.2024
Subjects
discharge method
impedance analyzer
integral method
large-size power capacitor
stray inductance
testing fixture
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ISSN1000-128X

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Summary:Stray inductance present in the commutation loop of converters significantly impacts power semiconductor devices. However, accurately extracting stray inductance from large-size power capacitors remains challenging. While the discharge method is the current standard extraction technique, it is unsuitable for capacitors containing multiple resonance frequencies. Leveraging the high accuracy of the integral method in extracting stray inductance from busbars, an extension has been made to extract stray inductance from large-size power capacitors. Enhanced by a clarified error correction process, the results of the integral method are considered accurate. Despite the integral method yielding highly accurate results, it demands substantial testing resources, poses high-voltage safety hazards, and exhibits low efficiency. This paper presents a stray inductance extraction method utilizing an impedance analyzer, and provides a detailed explanation of the testing fixture and impedance compensation method. Comparing th
ISSN:1000-128X