A Stationary Reference Frame Grid SynchronizationSystem for Three-Phase Grid-Connected PowerConverters Under Adverse Grid Conditions
Location: USA
Publication date: 2012-01-01
Published in: IEEE Tranaction on Power Electronics, June 2011
ref. DOI: 10.1109/TPEL.2011.2159242

Local members

Alvaro Luna

PhD. Senior Researcher.

External members

Etxeberria-Otadui, I. , Teodorescu, R. , Blaabjerg, F.



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 newgrid 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 gridvoltage 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.


Associated projects

National public