Microinverter for Residential PV Systems
R.S. DESHMUKH (TU Delft - Electrical Engineering, Mathematics and Computer Science)
T. B. Soeiro – Mentor (TU Delft - DC systems, Energy conversion & Storage)
A. Lekic-Vervoort – Graduation committee member (TU Delft - Intelligent Electrical Power Grids)
Pavol Bauera – Graduation committee member (TU Delft - DC systems, Energy conversion & Storage)
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Abstract
Up to 5 kW PV installations microinverters are common alternatives for the typical string solar inverters. The main draw back of the technology is the slight higher initial cost, however, a more efficient energy generation can be achieved if one of the PV modules are operated optimally at the maximum power point. This work shows that converters employed using low voltage Si-MOSFETS can exhibit excellent loss performance. Power efficiency above 97 % is possible yielding to much lower total cost of ownership. This thesis emphasizes on the investigation of microinverter technology in residential PV systems. A small scale prototype is developed to evaluate the performance of the selected topology. The advantage of the designed circuit are flexibility in expanding the system, redundant switching states and, less number of semiconductor switches per PV module.