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A Transformerless Photovoltaic Inverter with Dedicated MPPT for Grid Application

In this paper, a transformerless grid-connected photovoltaic multilevel inverter for realizing individual maximum power point (MPP) of each module has been presented. The presented configuration is simple and modular, providing flexibility to increase the number of inputs with less component count. The systematic procedure for designing the controller has been detailed. The presented converter and the controller design allow the system to operate with the dedicated MPP and simultaneously achieve the load demand while maintaining the desired grid voltage. This has been verified under different operating scenarios in the MATLAB environment. The leakage current and the common mode voltage have been analyzed to verify its suitability for grid-connected systems.