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Ground-Voltage-Control (GVC) for Transformerless Inverters in PV Power Plants Prevents TCO Corrosion and Polarisation Effects
F. Haase, U. Borup
PV System, System Performance, Inverter, TCO Corrosion, Polarisation Effect
Components for PV Systems
Subtopic: Balance of System Components
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 4BV.1.20
4438 - 4441
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-4BV.1.20
0,00 EUR
Document(s): paper


For many PV modules special grounding arrangements are required. For example, Thin-Film modules may suffer from TCO corrosion, which can destroy the entire PV plant. PV modules with backside contact cells may see a reduction in efficiency of approx. 30% due to polarisation effects. To prevent these serious issues, module manufacturers specify the grounding of the negative/positive side of the DC string. This can only be done with low efficiency, transformer based inverters and additional “Grounding-Kits”. GVC is a new patented technology for the high efficient transformer-less Danfoss TLX inverter series, allowing the usage for any kind of PV modules.