Robust phase locked-loop algorithm for single-phase utility-interactive inverters

Ali Elrayyah, Yilmaz Sozer, Malik Elbuluk

Research output: Contribution to journalArticle

27 Citations (Scopus)


An accurate, robust and efficient transport-delay based phase-lock loop (TDPLL) algorithm is proposed for single phase utility interactive inverters. The traditional TDPLL has low complexity and its transient response is smooth, but its performance is significantly affected by the change in the grid frequency. The proposed TDPLL is designed to have robustness against grid frequency variations. The proposed method uses two delays instead of one to cancel the grid frequency variation effect. Since the grid voltage could be polluted by harmonics and may suffer from sag/swell anomalies, the proposed method is enhanced further to be robust against these sources of disturbances. Moreover, a method is proposed to tune the parameters of the system. The performance of the proposed PLL is validated through simulations and experimental results.

Original languageEnglish
Pages (from-to)1064-1072
Number of pages9
JournalIET Power Electronics
Issue number5
Publication statusPublished - 2014


ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this