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Flying-Capacitor Topology for Grounding of Single-Phase Transformer-less Three-Level Photovoltaic Inverters
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| Author(s) |
Olivier STALTER, Patrick WELLNITZ, Bruno BURGER |
| Abstract |
This paper presents a new inverter topology named after its operating principle based on aflying capacitor. The inverter uses neither a grid transformer (50/60 Hz) nor a high frequency transformer and therefore does not provide a strict galvanic isolation. However, its innovative circuit hasbeen designed in order to allow grounding one pole of the photovoltaic (PV) generator which is notfeasible with common transformer-less PV inverters. The slight drop in efficiency and increase in sizeand costs due to the use of more numerous semiconductors and additional passive components is wellbelow that of inverters using high or low frequency transformers and is fully compensated by decisivetechnical advantages. Indeed, the ability to ground the DC side of the inverter can be of a great interestfor certain PV generators but also for other kinds of applications such as batteries. |
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| Filename: | 0111-epe2014-full-12513065.pdf |
| Filesize: | 2.089 MB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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