Abstract
Design challenges for grid-connected solar PV systems related to the power conditioning units are power quality, efficiency, reliability, cost of implementation etc. This paper deals with single dc source-based double LDN high-resolution multilevel inverter topology with the appropriate blend of switches to address most of the practical constraints of central inverter application. A two-stage high-resolution multilevel inverter solution is adapted to double the inverter utilization as well as to increase efficiency. Reactive power handling and fault blocking capability of the system are also demonstrated in this work. The converter is extensively simulated using MATLAB/Simulink. Experimental results from laboratory prototype confirm the usefulness of the proposed concepts.
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