Authors: Alfonso Parreño Torres; Fco. Javier López-Alcolea; Pedro Roncero-Sánchez; Javier Vázquez; Emilio J. Molina-Martínez; Felix García-Torres
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This paper presents the design of a current control for a grid-connected single-phase voltage source inverter (VSI). The VSI is connected to the grid through an LCL filter in order to attenuate the switching harmonics in the output signal. The proposed control provides an active damping at the resonance frequency and tracks the current reference with a fast dynamic response. The control scheme is based on a resonant regulator implemented in a structure with two nested controllers. The proposed control ensures a direct pole-placement of the closed-loop transfer function without the need for state observers and only measuring the grid current