A Robust-Synchronization-Loop for Grid-Connected Distributed Generation
In this paper, a novel Robust-Synchronization-Loop
(RSL) is proposed to track the phase and frequency of the grid voltage.
The method can be widely applied to the grid-connected converters in
integration of distributed generations (DGs). The detailed analytical
model and the parameter tuning based on a small-signal model of the RSL
are presented. It is shown that the eigenvalues associated with the RSL
remain always on the left half-plane, thus, it provides better stability
property with the grid-connected DG converters. In order to show the
effectiveness of the proposed RSL, simulation results are provided for
scenarios of the grid condition such as voltage and frequency
disturbance, unbalance grid condition and grid faults. The results show
that the proposed method effectively tracks the phase and frequency of
the grid voltage and maintains the good synchronism of the DG converters
during these different small and large disturbances in the power system.