Abstract
To ensure a zero steady-state current error in the control of three-phase grid-connected voltage source converters (VSCs), different techniques have been proposed. One of the most popular ones is using the resonant controller mainly because it is implemented in the stationary reference frame and ensures a zero steady-state tracking error. The resonant controller, however, is not able to make a distinction between the positive and negative sequences of the same frequency component. To deal with this problem while maintaining attractive features of the resonant controller, using a complex integrator (CI), also known as the reduced-order generalized integrator, has been proposed. The CI is actually the stationary frame equivalent of a simple integrator working in the dq frame. The aim of this paper is presenting the small-signal modeling and tuning of the adaptive CT-based current controller for three-phase grid-interfaced VSC, which have not been well-addressed yet.