Analysis and Design of High-Power Single-Stage Three-Phase Differential-Based Flyback Inverter for Photovoltaic Applications

This paper offers mathematical analysis, design, and experimental verification of three-phase differential-based flyback inverter (DBFI) based-on SiC-MOSFET for photovoltaic (PV) applications. The DBFI utilizes continuous modulation-scheme (CMS) combined with the static linearization method (SLM), for low-order harmonics mitigation, based-on a simple and low-cost flyback converter. In addition, design investigations are detailed for the high-power isolated single-stage inverter. Therefore, the paper reveals the design practical issues of the DBFI such as; power-stage design, HFT-based Nano-Crystalline Core design, passive elements selection, harmonics compensation strategy. The system is simulated by PSIM computer-aided simulator. Consequently, the 1.6 kW, 200 V, 50 kHz DBFI prototype has been experimentally validated with and without negative-sequence second-order harmonic component (NS-SOHC).