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Grid synchronization algorithms are of great importance
in the control of grid-connected power converters, as fast and
accurate detection of the grid voltage parameters is crucial in order
to implement stable control strategies under generic grid conditions.
This paper presents a new grid synchronization method for
three-phase three-wire networks, namely dual second-order generalized
integrator (SOGI) frequency-locked loop. The method is
based on two adaptive filters, implemented by using a SOGI on
the stationary αβ reference frame, and it is able to perform an excellent
estimation of the instantaneous symmetrical components of
the grid voltage under unbalanced and distorted grid conditions.
This paper analyzes the performance of the proposed synchronization
method including different design issues. Moreover, the
behavior of the method for synchronizing with highly unbalanced
grid is proven by means of simulation and experimental results,
demonstrating its excellent performance.
CitationRodriguez, P. [et al.]. A stationary reference frame grid synchronization system for three-phase grid-connected power converters under adverse grid conditions. "IEEE transactions on power electronics", Gener 2012, vol. 27, núm. 1, p. 99-112.
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