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

• Published in: 2020 IEEE Applied Power Electronics Conference and Exposition (APEC) pp. 1778 - 1785
• Main Authors: Ali, Ahmed I. M., Sayed, Mahmoud A., Shawky, Ahmed, Takeshita, Takaharu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-03-2020
• Subjects: DC-AC grid-tied inverter; Differential-based flyback inverter (DBFI); Flyback converter; Frequency conversion; Harmonic analysis; Harmonic compensation; High frequency transformer (HFT); Negative sequence harmonic component (NSHC); Power system harmonics; Power system measurements; Renewable energy sources; Switching frequency; Transformer cores
• ISSN: 2470-6647
• DOI: 10.1109/APEC39645.2020.9124255

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.