Transformerless Inverter for Single-Phase Photovoltaic Systems
Top Cited Papers
- 5 March 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 22 (2), 693-697
- https://doi.org/10.1109/tpel.2007.892120
Abstract
When no transformer is used in a grid-connected photovoltaic (PV) system, a galvanic connection between the grid and the PV array exists. In these conditions, dangerous leakage currents (common-mode currents) can appear through the stray capacitance between the PV array and the ground. In order to avoid these leakage currents, different inverter topologies that generate no varying common-mode voltages, such as the half-bridge and the bipolar pulsewidth modulation (PWM) full-bridge topologies, have been proposed. The need of a high-input voltage represents an important drawback of the half-bridge. The bipolar PWM full bridge requires a lower input voltage but exhibits a low efficiency. This letter proposes a new high-efficiency topology that generates no varying common-mode voltage and requires the same low-input voltage as the bipolar PWM full bridge. The proposed topology has been verified in a 5-kW prototype with satisfactory resultsKeywords
This publication has 6 references indexed in Scilit:
- A Review of Single-Phase Grid-Connected Inverters for Photovoltaic ModulesIEEE Transactions on Industry Applications, 2005
- A Cost-Effective Single-Stage Inverter With Maximum Power Point TrackingIEEE Transactions on Power Electronics, 2004
- String and module integrated inverters for single-phase grid connected photovoltaic systems - a reviewPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- A novel type of utility-interactive inverter for photovoltaic systemPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- Multilevel converters for single-phase grid connected photovoltaic systems-an overviewPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- A new, transformerless, photovoltaic array to utility grid interconnectionPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002