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This paper presents an adaptive grid-voltage sensor- less control scheme for inverter-based distributed generation units based on an adaptive grid-interfacing model. An adaptive grid- interfacing model is proposed to estimate, in real time, the inter- facing parameters seen by the inverter and the grid-voltage vector simultaneously. A reliable solution to the present nonlinear estimation problem is presented by combining a grid-voltage estimator with an interfacing parameter estimator in a parallel structure. Both estimators adjust the grid-interfacing model in a manner that minimizes the current error between the grid model and the actual current dynamics, which acts as a reference model. The estimated quantities are utilized within the inner high-bandwidth current control loop and the outer power controller to realize an adaptive grid-voltage sensorless interfacing scheme. Theoretical analysis and simulation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme. [ABSTRACT FROM AUTHOR]