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http://dx.doi.org/10.6113/JPE.2016.16.1.18

Analysis of Phase Error Effects Due to Grid Frequency Variation of SRF-PLL Based on APF  

Seong, Ui-Seok (Dept. of Electrical Eng., Kyungnam University)
Hwang, Seon-Hwan (Dept. of Electrical Eng., Kyungnam University)
Publication Information
Journal of Power Electronics / v.16, no.1, 2016 , pp. 18-26 More about this Journal
Abstract
This paper proposes a compensation algorithm for reducing a specific ripple component on synchronous reference frame phase locked loop (SRF-PLL) in grid-tied single-phase inverters. In general, SRF-PLL, which is based on all-pass filter to generate virtual voltage, is widely used to estimate the grid phase angle in a single-phase system. In reality, the estimated grid phase angle might be distorted because the phase difference between actual and virtual voltages is not 90 degrees. That is, the phase error is caused by the difference between cut-off frequency of all-pass filter and grid frequency under grid frequency variation. Therefore, the effects on phase angle and output current attributed to the phase error are mathematically analyzed in this paper. In addition, the proportional resonant (PR) controller is adapted to reduce the effects of phase error. The validity of the proposed algorithm is verified through several simulations and experiments.
Keywords
All-pass filter; Phase error; Grid-tied single-phase inverter; Proportional resonant (PR) controller; Synchronous reference frame phase locked loop (SRF-PLL);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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