Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters


Vol. 14, No. 3, pp. 598-607, May  2014
10.6113/JPE.2014.14.3.598


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 Abstract

This paper proposes a frequency-locked loop (FLL) scheme for a single-phase grid-connected converter. A second-order generalized integrator (SOGI) based on fuzzy logic (FL) is applied to this converter to achieve precise phase angle detection. The use of this method enables the compensation of the nonlinear characteristic of the frequency error, which is defined in the SOGI scheme as the variation of the central frequency through the self-tuning gain. With the proposed scheme, the performance of the SOGI-FLL is further improved at the grid disturbances, which results in the stable operation of the grid converter under grid voltage sags or frequency variation. The PSIM simulation and experimental results are shown to verify the effectiveness of the proposed method.


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Cite this article

[IEEE Style]

J. Park, T. H. Nguyen and D. Lee, "Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters," Journal of Power Electronics, vol. 14, no. 3, pp. 598-607, 2014. DOI: 10.6113/JPE.2014.14.3.598.

[ACM Style]

Jin-Sang Park, Thanh Hai Nguyen, and Dong-Choon Lee. 2014. Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters. Journal of Power Electronics, 14, 3, (2014), 598-607. DOI: 10.6113/JPE.2014.14.3.598.