Common mode voltage in case of transformerless PV inverters connected to the grid
- 1 June 2008
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 2390-2395
- https://doi.org/10.1109/isie.2008.4677236
Abstract
For safety reasons grid connected PV systems include galvanic isolation. In case of transformerless inverters, the leakage ground current through the parasitic capacitance of the PV panels, can reach very high values. A common-mode model based on analytical approach is introduced, used to predict the common-mode behavior, at frequencies lower than 50 kHz, of the selected topologies and to explain the influence of system imbalance on the leakage current. It will be demonstrated that the neutral inductance has a crucial influence on the leakage current. Finally experimental results will be shown for the NPC topology, emphasizing the low leakage current for the case of a grid connection without galvanic isolation.Keywords
This publication has 9 references indexed in Scilit:
- Ground currents in single‐phase transformerless photovoltaic systemsProgress in Photovoltaics: Research and Applications, 2007
- Evaluation of three-phase transformerless photovoltaic inverter topologiesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- A Novel Microcontroller for Grid-Connected Photovoltaic SystemsIEEE Transactions on Industrial Electronics, 2006
- Overview of Control and Grid Synchronization for Distributed Power Generation SystemsIEEE Transactions on Industrial Electronics, 2006
- Three-Phase Low-Frequency Commutation Inverter for Renewable Energy SystemsIEEE Transactions on Industrial Electronics, 2006
- An Anti-Islanding Method for Single-Phase Inverters Based on a Grid Voltage Sensorless ControlIEEE Transactions on Industrial Electronics, 2006
- Photovoltaic Power Conditioning System With Line ConnectionIEEE Transactions on Industrial Electronics, 2006
- Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A SurveyIEEE Transactions on Industrial Electronics, 2006
- A novel multicell DC-AC converter for applications in renewable energy systemsIEEE Transactions on Industrial Electronics, 2002