Fig. 1. Grid connected inverter system with LCL filter.
Fig. 2. Block Diagrams of each Active Damping Method.
Fig. 4. Block diagram of the grid connected inverter system.
Fig. 5. Comparison of frequency response characteristics in S-domain and Z-domain.
Fig. 6. Changing the resonant frequency with the variation of capacitor value.
Fig. 7. Block diagram of a proposed method.
Fig. 8. Comparison of frequency response characteristics with and without LPF(fL=3000[Hz], ζ=1).
Fig. 9. Changing the resonant frequency with the variationof capacitor value with LPF(fL=3000[Hz], ζ=1).
Fig. 10. Pole-zero map of feedback system according to the cut off frequency of LPF.
Fig. 11. Grid voltage and current waveforms in simulation results.
Fig. 12. Experimental waveforms of vg, i2(vg : 100 [V/div], i2: 10 [A/div], 5[ms/div]).
Fig. 3. Stability Region of the GCF(Grid Current Feedback) method.
TABLE I INVERTER SYSTEM PARAMETERS
참고문헌
- R. P. Alzola, M. Liserre, F. Blaabjerg, R. Sebastian, J. Dannehl, and F. W. Fuchs, "Analysis of the passive damping losses in LCL-filter-based grid converters," IEEE Trans. Power Electron, Vol. 28, No. 6, pp. 2642-2646, Jun. 2013. https://doi.org/10.1109/TPEL.2012.2222931
- R. Pena-Alzola, M. Liserre, F. Blaabjerg, M. Ordonez, and T. Kerekes, "A self-commissioning notch filter for active damping in a three-phase LCL filter-based grid-tie converter," IEEE Trans. Power Electron, Vol. 29, No. 12, pp. 6754-6761, Dec. 2014. https://doi.org/10.1109/TPEL.2014.2304468
- X. Wang, F. Blaabjerg, and P. C. Loh, "Virtual RC damping of LCL filtered voltage source converters with extended selective harmonic compensation," IEEE Trans. on Power Electron, Vol. 30, No. 9, pp. 4726-4737, Sep. 2014. https://doi.org/10.1109/TPEL.2014.2361853
- J. Xu, S. Xie, and T. Tang, "Active damping-based control for grid connected LCL-filtered inverter with injected grid current only," IEEE Trans. Ind. Electron, Vol. 61, No. 9, pp. 4746-4758, Sep. 2014. https://doi.org/10.1109/TIE.2013.2290771
- S. Parker, B. McGrath, and D. G. Holmes, "Regions of active damping control for LCL filters," IEEE Trans. Ind. App, Vol. 50, No. 1, pp. 424-432, Jun. 2014. https://doi.org/10.1109/TIA.2013.2266892
- M. Liserre, F. Blaabjerg, and A. DellAquila, "Step-by-step design procedure for a grid-connected three-phase PWM voltage source converter," Int. J. Electron, Vol. 91, No. 8, pp. 445-460, Aug. 2004. https://doi.org/10.1080/00207210412331306186
- D. N. Zmood and D. G. Holmes, "Stationary frame current regulation of PWM inverters with zero steady-state error," IEEE Trans. Power Electron, Vol. 18, No. 3, pp. 814-822, May. 2003. https://doi.org/10.1109/TPEL.2003.810852
- P. Mattavelli, F. Polo, F. Dal Lago, and S. Saggini, "Analysis of controldelay reduction for the improvement of UPS voltage-loop bandwidth," IEEE Trans. Ind. Electron, Vol. 55, No. 8, pp. 2903-2911, Feb. 2008. https://doi.org/10.1109/TIE.2008.918607