Voltage Balancing in Multilevel-Converter-Based UPS
Conference: PCIM Europe 2015 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/19/2015 - 05/20/2015 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2015
Pages: 8Language: englishTyp: PDF
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Authors:
Giuntini, Lorenzo (GE Consumer & Industrial SA, Switzerland)
Abstract:
Efficiency is a key requirement for UPS systems, and multi-level technology is increasingly used to reduce the conversion losses. In this context, NPC topologies with split DC-link are particularly common. This paper addresses voltage balancing across the split DC-link capacitors by means of a dedicated circuit. It also introduces a novel operating mode of the NPC converter legs to take over the DC balancing function in case of a failure in the dedicated circuit. Operation is verified either through simulation or experimentally.