Design of a frequency adaptative control for a grid-connected single-phase voltage source inverter

This article focuses on the design of a control that resolves the traditional conflict between two of the most important properties of the single phase inverter connected to the network, i.e., current injection with low harmonic content and fast dynamics. To do this, the use of frequency selective solutions is proposed so that these only modify the response of the system for a limited range of frequencies. The solutions employed are, furthermore, frequency adaptive. In this way, the proposed control is completely resistant to variations in grid frequencies.