PV/Battery Grid Integration Using a Modular Multilevel Isolated SEPIC-Based Converter

Photovoltaic (PV) plants can be built rapidly when compared with other conventional electrical plants; hence, they are a competent candidate for supplying the electricity grid. The output power of PV modules used in plug-in electric vehicles (PEVs) DC charging stations to reduce burden on grid, particularly during peak load hours. To integrate and (EVs) modular multilevel converters (MMCs) topologies producing staircase voltage waveforms preferred as able deliver less total harmonic distortion (THD) higher efficiency addition lower stress semiconductor switches. In centralized MMC topologies, direct connection high-DC-link input is required which not appropriate plants. A new topology PV/EV/grid integration proposed this paper, where individual arrays directly connected each phase AC grid harvest maximum available point. current-source converter (CSC) based single-stage isolated SEPIC adopted submodule (SM) given its outstanding features, such low ripple current, high efficiency, factor, flexible or than voltage. SMs operate both DC/DC DC/AC operating modes. Proper controllers mode operation designed applied supply constant current from either battery cells by eliminating second-order component. performance verified simulations downscaled prototype controlled TMSF28335 DSP.