Startup strategy for grid connected PV micro inverter

Startup of any converter is a very dynamic and hardly controllable process. The regulator outputs are fluctuating, sensor readings are constantly changing and the fault probability is the highest. That is especially true for grid connected converters that need to be exactly in phase with the grid before an actual connection is done. In this paper a startup strategy for a grid connected PV micro inverter is proposed, explained and verified by the test results.