Steady-State Linear Kalman Filter-based PLLs for Power Applications: A Second Look

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Abstract

In three-phase power and energy applications, the synchronous reference frame phase-locked loop (SRF-PLL) is a popular tool for synchronization purposes. The SRF-PLL can be easily and effectively customized for different scenarios by changing its loop filter. Recently, some supposedly different PLLs using the steady-state linear Kalman filter have been developed. The main aim of this letter is to analyze these PLLs. It is demonstrated that they are actually equivalent to some well-known SRF-PLL structures and, therefore, provide no advantage compared to them.

Original languageEnglish
Article number8331945
JournalI E E E Transactions on Industrial Electronics
Volume65
Issue number12
Pages (from-to)9795-9800
Number of pages6
ISSN0278-0046
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Fixed-gain filter
  • Kalman filter
  • phase-locked loop (PLL)
  • synchronization
  • synchronous reference frame PLL (SRF-PLL)
  • three-phase systems

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