Dynamic Performance Improvement of Multiple Delayed Signal Cancelation Filters Based Three-Phase Enhanced-PLL

Srinivas Gude, Chia Chi Chu*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

38 Scopus citations


Phase-locked loop (PLL) techniques are widely utilized for synchronization and control of grid-connected power electronic systems for estimation of phase angle, frequency, and amplitude of the grid voltage. Recently, an advanced scheme called the three-phase enhanced PLL (3P-EPLL) has been proposed for estimating the grid voltage information. However, recent studies have shown that this 3P-EPLL cannot provide accurate estimations under adverse grid conditions, especially when the grid voltage is polluted with harmonics, dc offsets, and unbalance. This paper proposes an improved scheme of 3P-EPLL. A novel filtering technique called the multiple delayed signal cancelation (MDSC) is integrated into both the phase-angle estimation loop, and the amplitude estimation loop of the 3P-EPLL for eliminating periodic ripples due to harmonics and unbalance in the grid voltage. MDSC filters can indeed provide more flexibility to configure the lowest undesired harmonics, and can have less delay time in the digital implementations when compared with moving average filters and cascaded delayed signal cancelation filters. Thus, the fast response time of the filter is expected. To improve the dynamic performance of the 3P-EPLL, the proportional-integral-derivative controller is used instead of the conventional proportional-integral controller. Comprehensive analysis of the MDSC-based 3P-EPLL is investigated. Both simulations and experimental studies are conducted to validate the prompt dynamic performance of the proposed MDSC-based 3P-EPLL.

Original languageEnglish
Article number8323220
Pages (from-to)5293-5305
Number of pages13
JournalIEEE Transactions on Industry Applications
Issue number5
StatePublished - 01 09 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.


  • DC offsets
  • harmonics
  • multiple delayed signal cancelation (MDSC)
  • three-phase enhanced phase-locked loop (3P-EPLL)
  • unbalance


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