SINGLE-STAGE PHOTOVOLTAIC GRID-CONNECTED INVERTER AND CONTROL METHOD AND APPLICATION THEREOF

摘要

A grid-connected single-stage photovoltaic inverter is provided, which includes a direct current (DC) to alternating current (AC) inverter circuit, a DC to DC voltage booster circuit and a bypass element. An output of the DC to AC inverter circuit is connected to an alternating current grid, the DC to DC voltage booster circuit is connected in series between a photovoltaic array and the DC to AC inverter circuit, and the bypass element is connected in parallel with the DC to DC voltage booster circuit. A rated power capacity of the DC to DC voltage booster circuit is less than a rated power capacity of the DC to AC inverter circuit.