A new three-phase DPLL frequency estimator based on nonlinear weighted mean for power system disturbances

Journal ar
IEEE Transactions on Power Delivery
  • Volumen: 28
  • Número: 1
  • Fecha: 01 January 2013
  • Páginas: 179-187
  • ISSN: 08858977
  • Source Type: Journal
  • DOI: 10.1109/TPWRD.2012.2219561
  • Document Type: Article
A new three-phase digital phase-locked loop (DPLL) is proposed to determine the instantaneous grid frequency under power system disturbances. The proposed solution is based on single-phase DPLL algorithms, defining the estimated grid frequency as a nonlinear weighted mean of the three single-phase DPLL outputs. Orthogonal signals required by the DPLL algorithms are obtained through a fictitious quadrature voltage using five different appropriated approaches. The proposed structures have been assessed through extensive analysis under balanced and unbalanced conditions. For this purpose, real voltage dips collected in a Spanish wind farm along several months are included in the paper as examples of frequency estimations. In addition, results from conventional three-phase DPLL topologies are presented to confirm the validity of the proposed DPLL structures. © 1986-2012 IEEE.

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