Implementation of a Combination of Push-pull Converter and Selective Harmonic Distortion Based Full-bridge Inverter on Multi-stage Microinverter

Microinverters are becoming more popular as the number of PV installations in low-power applications increases. When compared to single-stage microinverters, multi-stage microinverters offer many advantages, one of which is simple control techniques. A microinverter with two stages was created in this study: the first stage is the DC-DC conversion process using a push-pull converter, and the second stage is the DC-AC conversion process using a full-bridge inverter. The average efficiency of the push-pull converter and full-bridge inverter is 63% and 93%, respectively, according to the test results. Based on the experimental results of total harmonic distortion at the microinverter output voltage of 2.3%, the selective harmonic elimination method works effectively.