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An inverter is generally employed with MV LFT to connect to the grid in agrid-tied PV system. However, in some single-stage topologies, the LFTs arereplaced by HFT combined with an unfolder inverter. Generally, these topologieshave limited use at high-power MV grids due to high switching losses on theprimary side. This study proposes an LLC resonant converter-based single-stageinverter design procedure. Resonant converters make use of ZVS to reduceswitching losses. The design includes both the resonant tank as well as outputfilter components. The design is verified by simulations in MATLAB/Simulink forvarious loads and input voltages at 13.8kV grid output voltage. THD simulationsvalidate the filter design.

Design Methodology for a Medium Voltage Single Stage LLC Resonant Solar PV Inverter