Sinewave inverter type power conditioner with high-frequency flyback transformer link for solar photovoltaic power generation

摘要

This paper presents a novel prototype of the utility-interfacing SPWM inverter using the high-frequency flyback transformer for the small-scale solar photovoltaic power conditioner 1kW - 4kw). The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital for solar photovoltaic power conditioner Systems with the viewpoint of safety and convenience. The discontinuous conduction mode (DCM) operation of the flyback transformer is also introduced to establish a simple topology of the inverter circuit and control scheme. First, the operating principle of the proposed circuit is described for the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented. The results of the circuit are verified by both computer simulations and experiments. Finally, the modified circuit with the soft-switching enhancement is proposed for further improvement in future work.