An adaptive grid-voltage sensorless interfacing scheme for inverter-based distribute
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15-11-2010, 02:22 PM




Abstract

Inverter-based distributed generation has large potential to provide premium power quality.An adaptive grid-voltage sensorless interfacing scheme for inverter-based distributed generation (DG) units based on an
adaptive grid-interfacing model. First, a discrete-time model of a current controlled grid- connected inverter is presented.Then, an adaptive grid- interfacing model is designed with low computational demand to estimate, in real-time, the interfacing (impedance) 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. Third, 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 evaluation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme.

References:
ieeexplore.ieeexpl/freeabs_all.jsp?arnumber=1355345
ieeexplore.ieeexpl/freeabs_all.jsp?arnumber=5075661


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