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The Instantaneous Phase-Tracking in PLL using the DFT Algorithm  

Kim, Youn-Seo (Dept. of Electronic Engineering Chongju University)
Yang, Oh (Dept. of Electronic Engineering Chongju University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.45, no.6, 2008 , pp. 141-148 More about this Journal
Abstract
An utility voltage information, including the frequency, phase angle and amplitude is very important in many industrial systems. The grid-connected photovoltaic system in the limelight as alternative energy needs utility voltage information such as frequency, phase angle and magnitude to connect the grid-line. In this paper, it proposes the instantaneous phase-tracking in PLL that uses the frequency from the utility voltage as a sync signal and locks the phase with compensation for phase difference from DPT algorithm. It also proposes not only DFT algorithm execution by every sample not by one period, but also phase-tracking method in a wide range of frequency not a fixed one. This paper shows the feasibility and the usefulness of the proposed methods through the computer simulation and the experiment.
Keywords
PLL; DFT; Frequency measurement; Photovoltaic system;
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