Normalization of Capacitor-Discharge I 2 t by Short-Circuit Fault in VSC-Based DC System
| Autor: | Seung-Ki Sul, Seong-Yong Lee, Young-Kwang Son, Hyung-June Cho |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Power Electronics. 37:843-854 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2021.3096075 |
| Popis: | In the voltage-source-converter-based dc system, the short-circuit current increases rapidly due to neighborhood dc-link capacitance. The protection system using a high-speed fuse has been applied in the industry to protect before the current freewheeling that ruins a semiconductor device. For proper protection system design, the capacitor-discharge I 2 t must be analyzed and set higher than the melting I 2 t of the fuse by securing sufficient capacitance. However, due to the implicit characteristics of the I 2 t function, it is difficult to calculate the required capacitance directly considering unknown fault resistance. In this article, the normalized I 2 t map of capacitor-discharge is presented as a calculation reference. After calculating the base values, the normalized I 2 t value can be calculated easily from the map without complicated formula. Since it is expressed as a function of the damping factor (half of the normalized resistance) and normalized capacitor's voltage, it helps I 2 t design with the range of fault resistance and voltage drop simultaneously. The proposed normalization and its result were verified through the experimental tests under various fault resistance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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