Decoupled Double Synchronous Reference Frame current controller for unbalanced grid voltage conditions
Location: USA
Publication date: 2012-09-20
Published in: IEEE Energy Conversion Congress and Exposition 2012, Raleigh (USA) - ECCE 2012
ref. DOI: 10.1109/ECCE.2012.6342184

Local members

Alvaro Luna

PhD. Senior Researcher.

External members

Reyes, M. , Vazquez, S. , Cassasco, J.M. , Teodorescu, R.



Due to the growing changes in the electrical network related to the new distributed generation scheme and the integration of renewable energy sources, new requirements for grid-connected power converters are being defined in the new grid codes. The injection of positive- and negative-sequence current components is becoming necessary for achieving new capabilities like the reactive power injection during a grid fault. This paper deals with a fundamental issue in this topic, i.e., the performance of the current controller. Classical dq controllers, which are extensively used in industrial applications, degrade its performance when both sequences are involved, as unavoidable oscillations in the dq axes appear. In this paper, a new scheme for controlling positive- and negative-sequence currents using dq controllers is proposed, based on an enhanced Double Synchronous Reference Frame (DSRF) controller. In this paper the DSRF controller is improved by adding a decoupling network which counteracts the oscillations caused by the presence of both sequences. Experimental results will demonstrate the validity of the proposed Decoupled DSRF (DDSRF) controller.


Associated projects

National public