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http://dx.doi.org/10.6113/JPE.2014.14.3.598

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

Park, Jin-Sang (PLASPO Inc.)
Nguyen, Thanh Hai (Department of Electrical Engineering, Yeungnam University)
Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University)
Publication Information
Journal of Power Electronics / v.14, no.3, 2014 , pp. 598-607 More about this Journal
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.
Keywords
Current control; Frequency-locked loop; Fuzzy logic; Second-order generalized integrator (SOGI); Single-phase converter;
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Times Cited By KSCI : 4  (Citation Analysis)
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