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

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Article number5462
<mark>Journal publication date</mark>28/07/2022
Number of pages25
Publication StatusPublished
<mark>Original language</mark>English


Photovoltaic (PV) plants can be built in a relatively short period compared with other conventional plants, and therefore, they can be regarded as a competent candidate for supplying the electricity grid. The output power of the PV modules can be used in plug-in electric vehicles (PEVs) DC charging stations to enforce the charging infra-structures. To integrate PV modules and electric vehicles (EVs) with the electricity grid, the modular multilevel converters (MMCs) topologies producing staircase voltage waveform can be employed, resulting in less total harmonic distortion (THD) and higher efficiency in addition to lower voltage stress on semiconductor switches. How-ever, a direct connection to high DC-link input voltage is required for the conventional MMCs, unsuitable for PV plants. A new MMC topology for PV/EV/grid integration is proposed in this paper, which can be directly connected to the electricity grid. A cur-rent-source converter (CSC) based on an isolated SEPIC converter is adopted as the submodule (SM) for the proposed MMC topology given its crucial features such as low input ripple current, high efficiency, high power factor, and non-inverted flexible out-put voltage higher or lower than the input voltage. The performance of the proposed converter is verified by simulations and a down-scaled prototype controlled by TMSF28335 DSP.