Grid connected single-stage inverter based on cuk converter

摘要

The present invention relates to a grid connected single-stage inverter based on a cuk converter, which uses a cuk converter to convert a DC voltage supplied from a renewable energy module into a full-wave rectified sinusoidal voltage, converts the half period of the voltage of the sinusoidal wave rectified though an unfolding bridge circuit part to negative polarity to output the voltage of the sinusoidal wave, and supplies it to a system power source, thereby compensating for a phase lag effect and attenuating a total harmonic distortion in a systematic disturbance environment. According to the grid connected single-stage inverter based on a cuk converter, it is possible to produce DC power with AC power at a high power density and at a low cost. Especially, it is possible to supply power to the grid power source stably even in an environment where output control is difficult due to system disturbance and right half plane zero characteristic. The grid connected single-stage inverter includes: a renewable energy module; a DC-DC converter part; an unfolding bridge circuit; and a main control part.