Research on three-phase eight-switch two-stage t-type photovoltaic grid-connected inverter [三相八开关的两级式T型光伏并网逆变器研究]

作者：Zhang Z.; Zhou H.^*; Jiang M.; Wang Z.; Kang L.

来源：Acta Energiae Solaris Sinica, 2019, 40(5): 1253-1261.

• Interleaved control
• Inverter
• Phase shift
• Photovoltaic
• Space vector pulse width modulation

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.

• 单位
  东莞理工学院; 华南理工大学