Single-Stage Boost Inverter Applied to Photovoltaic System

This paper proposes one type of photovoltaic power (PV) system with single-stage boost inverter. The single-stage inverter circuit provides boost inversion ability which can eliminate the limitations of conventional voltage source inverter. By regulating the shoot-through zero state and the parameters of coupled inductor, the proposed inverter can boost the bus voltage and output desired output voltage even when input dc voltage is low. By controlling the shoot-through zero state when the coupled inductor is preset, the PV array output voltage is controlled and the maximum power point tracking (MPPT) is realized. The operation principle, control method and characteristics of the system are presented. A prototype has been built to verify the theoretical analysis.