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Why Midpoint Balancing of an NPC Is Still a Challenge in Medium-Voltage Applications
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| Author(s) |
Jakub KUCKA, Martin NEUMANN |
| Abstract |
In medium-voltage applications, neutral-point clamped converters (NPCs) are often utilized withoptimized pulse patterns. While their utilization improves the current quality significantly without impacting the switching losses, the midpoint balancing becomes a challenge. This paper analyzes the known midpoint balancing methods for NPCs which utilize optimized pulse patterns. Furthermore, it derives a novel model capable of predicting the usability of these balancing methods in variousoperation points. The model demonstrates that currently, none of the investigated publicly-available methods is capable to reliably balance the dc-link capacitors in operation points with purely inductive power factor, which is also validated by a time-domain simulation. |
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| Filename: | 0540-epe2023-full-20024571.pdf |
| Filesize: | 857.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2023-09-24 by System |
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