Metodologia de projeto para um filtro LCL modificado com adição de um indutor de modo-comum para aplicações fotovoltaicas sem transformador conectadas à rede

Grid-connected transformerless photovoltaic (PV) systems have become very popu- lar, due to their smaller size/weight, greater efficiency and lower cost. However, the common- mode voltage (CM) generated in power inverters causes leakage current, which according PV standards, must be limited. Among different methods limit modified LCL (MLCL) filter with passive damping is an efficient simple solution. it necessary oversize components of MLCL keep current below 300 mA rms, established by increasing size differential inductors. On other hand, a CM inductor can added current. These inductors process less energy, therefore considerably reduce total volume magnetic devices stage. This paper presents methodology elements that complies three-phase two-level grid-connected inverter. Simulation results are presented confirm theoretical analyses.