Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems
Top Cited Papers
- 18 August 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industrial Electronics
- Vol. 57 (4), 1360-1368
- https://doi.org/10.1109/tie.2009.2029511
Abstract
In some photovoltaic (PV) applications, it is possible to remove the transformer of a system in order to reduce losses, cost, and size. In transformerless systems, the PV module parasitic capacitance can introduce leakage currents in which the amplitude depends on the converter topology, on the pulsewidth modulation, and on the resonant circuit comprised by the system components. Based on the common-mode voltage model, modulation techniques are proposed to eliminate the leakage current in transformerless PV systems without requiring any modification on the converter and any additional hardware. The main drawback is that the proposed modulation technique for two-level inverters can only be used with 650-V dc link in the case of a 110-V (rms) grid phase voltage. Comparisons among the modulation techniques are discussed, and it is proven that the proposed modulation for two- and three-level inverters presents the best results. To validate the models used in the simulations, an experimental three-phase inverter is used.Keywords
This publication has 11 references indexed in Scilit:
- Transformerless Single-Phase Multilevel-Based Photovoltaic InverterIEEE Transactions on Industrial Electronics, 2008
- Multilevel Inverter Topologies for Stand-Alone PV SystemsIEEE Transactions on Industrial Electronics, 2008
- Multilevel Diode-Clamped Converter for Photovoltaic Generators With Independent Voltage Control of Each Solar ArrayIEEE Transactions on Industrial Electronics, 2008
- Common mode voltage in case of transformerless PV inverters connected to the gridPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- Partial shadowing, MPPT performance and inverter configurations: observations at tracking PV plantsProgress in Photovoltaics: Research and Applications, 2008
- Eliminating ground current in a transformerless photovoltaic application2007 IEEE Power Engineering Society General Meeting, 2007
- On the testing, characterization, and evaluation of PV inverters and dynamic MPPT performance under real varying operating conditionsProgress in Photovoltaics: Research and Applications, 2007
- Ground currents in single‐phase transformerless photovoltaic systemsProgress in Photovoltaics: Research and Applications, 2007
- An Anti-Islanding Method for Single-Phase Inverters Based on a Grid Voltage Sensorless ControlIEEE Transactions on Industrial Electronics, 2006
- Reduction of common-mode currents in PWM inverter motor drivesIEEE Transactions on Industry Applications, 1999