Resonant current controller with enhanced transient response for grid-tied inverters

Abstract

This paper highlights the limitations of the dynamic response of a grid-tied inverter connected through an inductor $L$ when it is controlled using a proportional+resonant controller. Then, a new resonant current controller structure is proposed. This structure can be used to control the current injected by a grid-tied inverter through an $L$ filter. When compared to the classic design, the proposed controller has better transient response, both to current reference and grid voltage changes. This is verified through simulation and experimental results.