-
Arnaldo O. Cunha Junior
Departamento de Engenharia Elétrica e de Computação, Universidade Federal da Bahia, BA
-
Filipe A. da C. Bahia
Departamento de Engenharia Elétrica e de Computação, Universidade Federal da Bahia, BA
-
Joao P. R. A. Mello
Unidade Acadêmica do Cabo de Santo Agostinho, Universidade Federal Rural de Pernambuco, PE
-
Fabiano F. Costa
Departamento de Engenharia Elétrica e de Computação, Universidade Federal da Bahia, BA
Keywords:
Transformerless Inverter, Photovoltaic Systems, Distributed Generation, Leakage Current Reduction, Level-Shifted PWM
Abstract
Distributed generation using renewable energies is a solution to meet the growing demand for energy around the world. In grid-connected photovoltaic systems, transformerless inverters play an important role as they are lighter, cheaper and more efficient than conventional ones. This paper proposes a transformerless inverter topology with AC-decoupling and DC-link midpoint clamping for photovoltaic systems, with the objective of solving the leakage current issue by eliminating common mode voltage fluctuation. A comparison with two other existing transformerless inverter topologies is performed. The proposed topology exhibits a reduction in leakage current, in addition to fewer devices in the current path and, consequently, lower losses. Simulation results are presented in order to demonstrate the best performance of the new topology.
