三相八开关的两级式T型光伏并网逆变器研究

摘要

A novel non-isolated two-stage photovoltaic grid-connected inverter is introduced. The system is composed of TL-Boost circuit and three-phase eight-switch T-type topology. The first-stage boost circuit not only reduces the inductor current ripple by using the interleaved control strategy of phase shift 180° of power switch but also achieves the balance of DC bus capacitor voltage by adjusting the conduction time of power switch. A nine-vectors space vector pulse width modulation algorithm based on optimal five-stage is adopted in second-stage inverter circuit, which simplifies the algebraic operation, reduces the switching loss and improves the utilization of the DC bus voltage. Finally, a 12 kW experimental platform is built to verify the validity and effectiveness of the proposed control method. ? 2019, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.

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