Design of sinusoidal photovoltaic inverter based on DSP

A sinusoidal photovoltaic inverter, which is a vital part of photovoltaic power generation system, is designed in this paper. The efficiency, quality, reliability are the key issues for the photovoltaic power supply. An improved push-pull DC-DC circuit is achieved and used in the inverter with full bridge DC-AC circuit. The control strategy is realized by a DSP chip, the DC booster is adopted by push-pull mode with SG3525, and the unipolar SPWM (Sinusoidal Pulse Width Modulation) algorithm is used to control full-bridge inverter. A PI digital controller is applied to achieve high performance for the command tracking and the load disturbance regulation. Experiment shows that the efficiency and characteristic satisfy the command.