Analysis of Influence of Stray Parameters of Intermediate DC Link on Converter Support Capacitor Current
In the main circuit of traction converter, due to the using of multiple four quadrant parallel power supply, the middle DC link can not fully realize low inductance connection and introduce line stray inductances, which leads to the resonance between multiple branch capacitors and the increase of ca...
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| Main Authors: | , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2021-07-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128x.2021.03.107 |
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| Summary: | In the main circuit of traction converter, due to the using of multiple four quadrant parallel power supply, the middle DC link can not fully realize low inductance connection and introduce line stray inductances, which leads to the resonance between multiple branch capacitors and the increase of capacitive current. In this paper, by building the equivalent simulation model of the main circuit of traction converter, combined with the double parallel main circuit structure of adding line stray parameters in the middle DC link, the main circuit transfer function of introducing line stray inductance into the middle DC link was derived. According to the amplitude frequency characteristics of the transfer function, the stray inductance will make the main circuit have a higher order resonance point besides the secondary resonance point, and the larger the stray inductance is, the larger the resonance gain is, resulting in the increase of the support capacitance current. |
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| ISSN: | 1000-128X |