Three-phase Inverter with Front-End SEPIC Converter (PLECS-Based)

This project looks at the design and performance of a Three-phase inverter with a front-end SEPIC converter for grid-connected PV systems, using the power electronics software PLECS. The two-stage DC to AC converter has an input voltage of 150V and is designed to have a single-phase voltage of 230V, three-phase voltage of 400V, power of 10kW per phase, and maximum efficiency. The performance of the designed circuit is analyzed in terms of desired output voltage and power, efficiency of conversion, loss distribution in the switches, harmonics, and switch junction temperatures. The results of the study show that the circuit achieves an overall conversion efficiency of 94.8% and exhibits low harmonics and temperature stresses on the components while delivering a steady output voltage and power.