DocumentCode :
535748
Title :
Overview of PLL methods for distributed generation units
Author :
Meersman, Bart ; De Kooning, Jeroen ; Vandoorn, Tine ; Degroote, Lieven ; Renders, Bert ; Vandevelde, Lieven
Author_Institution :
Dept. of Electr. Energy, Syst. & Autom. (EESA), Ghent Univ., Ghent, Belgium
fYear :
2010
fDate :
Aug. 31 2010-Sept. 3 2010
Firstpage :
1
Lastpage :
6
Abstract :
Distributed energy resources are increasingly being connected to the utility grid by means of an inverter. The basic information necessary for these inverter-connected distribution units are the frequency and phase angle of the utility grid. The phase angle can be estimated using phase-locked loops (PLLs). Voltage unbalance, harmonics and other kinds of undesirable pertubations are common conditions in the electric utility which are detrimental for the operation of the PLL. In this paper, three commonly known PLL methods are discussed: the single-phase synchronous reference frame (SRF) PLL, the three-phase SRF PLL and the double SRF PLL. The effect of voltage unbalance on those PLL methods will be discussed in this paper.
Keywords :
distributed power generation; energy resources; invertors; phase locked loops; power grids; PLL methods; distributed energy resources; distributed generation units; electric utility; frequency angle; inverter-connected distribution units; phase angle; phase-locked loops; single-phase synchronous reference frame; utility grid; voltage harmonics; voltage unbalance; Bandwidth; Frequency estimation; Generators; Harmonic analysis; Oscillators; Phase locked loops; Voltage control; distributed generation; phase-locked loop (PLL); three-phase voltage-source inverter (VSI); voltage unbalance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Universities Power Engineering Conference (UPEC), 2010 45th International
Conference_Location :
Cardiff, Wales
Print_ISBN :
978-1-4244-7667-1
Type :
conf
Filename :
5650148
Link To Document :
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