- Volume 16 Issue 1
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.
All-pass filter;Phase error;Grid-tied single-phase inverter;Proportional resonant (PR) controller;Synchronous reference frame phase locked loop (SRF-PLL)
- S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, “A review of single-phase grid-connected inverters for photovoltaic modules,” IEEE Trans. Ind. Appl., Vol. 41, No. 5, pp. 1292-1306, Sep./Oct. 2005. https://doi.org/10.1109/TIA.2005.853371
- F. Blaabjerg, R. Teodorescu, M. Liserre, and A. V. Timbus, “Overview of control and grid synchronization for distributed power generation systems,” IEEE Trans. Ind. Electron., Vol. 53, No. 5, pp. 1398-1408, Oct. 2006. https://doi.org/10.1109/TIE.2006.881997
- Z. Yao and L. Xiao, “Control of single-phase grid-connected inverters with nonlinear loads,” IEEE Trans. Ind. Electron., Vol. 60, No. 4, pp. 1384-1389, Apr. 2013. https://doi.org/10.1109/TIE.2011.2174535
- H. J. Choi, S. H. Song, S. G. Jeong, J. Y. Choi, and I. Choy, “Enhanced dynamic response of SRF-PLL system for high dynamic performance during voltage disturbance,” Journal of Power Electronics, Vol. 11, No. 3, pp. 369-374, May 2011. https://doi.org/10.6113/JPE.2011.11.3.369
- J. M. Kwon, K. H. Nam, and B. H. Kwon, “Photovoltaic power conditioning system with line connection,” IEEE Trans. Ind. Electron., Vol. 53, No. 4, pp. 1048-1054, Aug. 2006. https://doi.org/10.1109/TIE.2006.878329
- U. S. Seong and S. H. Hwang, "Analysis of phase error effects between virtual two-phase voltages in SRF-PLL based on APF," in Proc. Intern. Conf. on Power Electronics and ECCE Asia, pp. 2215-2220, 2015
- U. A. Miranda, M. Aredes, and L. G. B. Romlim, "A DQ synchronous reference frame control for single-phase converters," in Proc. PESC, pp. 1377-1381, 2005.
- J. W. Choi, Y. K. Kim, and H. G. Kim, "Digital PLL control for single-phase photovoltaic system," in IEE Proc. Electr. Power Appl., Vol. 153, No. 1, pp. 40-46, Jan. 2006.
- S. Shinnaka, “A robust single-phase PLL system with stable and fast tracking,” IEEE Trans. Ind. Appl., Vol. 44, No. 2, pp. 624-633, Mar./Apr. 2008. https://doi.org/10.1109/TIA.2008.916750
- S. Golestan, M. Monfared, and F. D. Freijedo, “Design-oriented study of advanced synchronous reference frame phase-locked loops,” IEEE Trans. Ind. Electron., Vol. 28, No. 2, pp. 765-778, Feb. 2013.
- S. Golestan, M. Monfared, F. D. Freijedo, and J. M. Guerrero, “Dynamics assessment of advanced single-phase PLL structures,” IEEE Trans. Ind. Electron., Vol. 60, No. 6, pp. 2167-2177, Jun. 2013. https://doi.org/10.1109/TIE.2012.2193863
- H. Yi, F. Zhuo, U. Li, Y. Zhang, and W. Zhan, “Comparison analysis of resonant controllers for current regulation of selective active power filter with mixed current reference,” Journal of Power Electronics, Vol. 13, No. 5, pp. 861-876, Sep. 2013. https://doi.org/10.6113/JPE.2013.13.5.861
- F. D. Freijedo, J. D. Gandoy, O. Lopez, P. F. Comesana, and C. M. Penalver, “A signal-processing adaptive algorithm for selective current harmonic cancellation in active power filters,” IEEE Trans. Ind. Electron., Vol. 56, No. 8, pp. 2829-2840, Aug. 2009. https://doi.org/10.1109/TIE.2009.2013844
- N. Zhang, H. Tang, and C. Yao, "A systematic method for designing a PR controller and active damping of the LCL filter for single-phase grid-connected PV inverters," Energies, Vol. 7, No. 6, pp. 3934-3954, Jun. 2014. https://doi.org/10.3390/en7063934
- H. G. Jeong, G. S. Kim, and K. B. Lee, “Second-order harmonic reduction technique for photovoltaic power conditioning systems using a proportional-resonant controller,” Energies, Vol. 6, No. 1, pp. 79-96, Jan. 2013. https://doi.org/10.3390/en6010079
- S. H. Hwang, L. Liu, H. Li, and J. M. Kim, “DC offset error compensation for synchronous reference frame PLL in single-phase grid-connected converters,” IEEE Trans. Power. Electron., Vol. 27, No. 8, pp. 3467-3471, Aug. 2012. https://doi.org/10.1109/TPEL.2012.2190425