Efficient Single-Stage Three-Phase Isolated Differential-Based Flyback Inverter with Selective Harmonic Compensation Strategy for Grid-Tied Applications

Abstract

this paper proposes a single-stage three-phase differential-based flyback inverter (DBFI) and its control scheme based on an efficient selective harmonic compensation (SHC) technique. The proposed DBFI exhibits many features such as; low passive elements count, high power density, boosting-bucking capability, low compensator order, reduced footprint, … etc. A comparatively unique feature of the proposed DBFI is the low input current ripple, which is suitable for renewable energy applications. However, temporarily power transfer operation increases the core-loss and saturation probability. Therefore, a special high frequency transformer (HFT) design-based FINEMET® F3CC Nano-crystalline core is carried out. In addition, single-pole integrator is used for negative-sequence harmonic component (NSHC) compensation. The proposed system, without and with the harmonic compensation strategy, has been verified over a grid-tied 1.6 kW, 200 V and switching frequency 50 kHz. MWPE3C6713A-Expert III digital controller is used to connect the proposed system to the grid.