MICROINVERTER SINGLE PHASE DERIVED OF FLYBACK TOPOLOGY FOR GENERATING SYSTEM PHOTOVOLTAIC

This paper proposes develop the implementation of a single-stage single-phase shunt microinversor obtaining four DC-DC converters operating in discontinuous flybacks mode and associated modules in parallel. As well, the... [ view full abstract ]

This paper proposes develop the implementation of a single-stage single-phase shunt microinversor obtaining four DC-DC converters operating in discontinuous flybacks mode and associated modules in parallel. As well, the magnetic volume, decreases the current efforts in primary transformers and minimizes fluctuations in the photovoltaic module offered by smaller current variations. However, for high power grid-connected applications, the DCM flyback converter has the following disadvantages, which limit the efficiency of the converter: high switching losses due to hard-switching; the high copper/iron transformer losses due to high flux excursions in the coupled-inductor; high MOSFET RDS(on) conduction losses due to high RMS and peak currents in the design. To validate the experimental research will develop a prototype that will effect the processing power connects a photovoltaic panel with 200 W of power in resistive loads with sinusoidal characteristics. The results obtained in the laboratory show that the microinversor flyback operating in open loop obtains yields close to 90%, being delivered to the load about 180 W. Thus, the ease in construction, using fewer components and enable the experimentally obtained microinversor flyback to perform the DC-AC conversion of photovoltaic systems of small powers connected in single-phase linear loads.