Fig. 1. LVRT and ZVRT regulation in Germany, USA and Japan[7].
Fig. 3. Reactive power curve depending on the grid voltage variations[11].
Fig. 11. Bode plot of D(s) of the SOGI-QSG with different control gain.
Fig. 15. Simulation results for zero voltage condition.
Fig. 16. Simulation results for conventional PLL control in zero voltage condition.
Fig. 17. Simulation results for proposed PLL control in zero voltage condition.
Fig. 19. Simulation results for reactive current injection (proposed PLL based on SOGI).
Fig. 2. LVRT regulation in Germany[11].
Fig. 4. LVRT regulation in the USA[4].
Fig. 5. LVRT regulation in Japan[7].
Fig. 6. Control block of the grid-connected inverter.
Fig. 7. Basic Structure of PLL concept[1].
Fig. 8. Notch filter + PLL Block diagram.
Fig. 9. dq-PLL Block diagram using APF method.
Fig. 10. SOGI-PLL Block diagram.
Fig. 12. Bode plot of Q(s) of the SOGI-QSG with different control gain.
Fig. 13. Proposed PLL block diagram based on SOGI-PLL.
Fig. 14. Proposed PLL algorism based on SOGI-PLL.
Fig. 18. PSIM Simulation schematic for three PLL controls.
Fig. 20. Simulation results for LVRT regulation in Germany.
Fig. 21. Simulation results for LVRT regulation in USA.
Fig. 22. Simulation results for LVRT regulation in Japan.
Fig. 23. Photograph of experimental equipment.
Fig. 24. Grid voltage, Inverter output current in Germany ZVRT test(Notch filter+PLL).
Fig. 25. Grid voltage, Inverter output current in Germany ZVRT test(dq-PLL using APF).
Fig. 26. Grid voltage, Inverter output current in Germany ZVRT test(SOGI-PLL).
Fig. 27. Grid voltage, Inverter output current in the USA ZVRT test(Notch filter + PLL).
Fig. 28. Grid voltage, Inverter output current in the USA ZVRT test(dq-PLL using APF).
Fig. 29. Grid voltage, Inverter Output current in the USA ZVRT test(SOGI-PLL).
Fig. 30. Grid voltage, Inverter output current in Japan ZVRT test(notch filter + PLL).
Fig. 31. Grid voltage, Inverter output current in Japan ZVRT test(dq-PLL using APF).
Fig. 32. Grid voltage, Inverter output current in Japan ZVRT test(SOGI-PLL).
TABLE I SIMULATION PARAMETERS
TABLE III SETTLING TIME COMPARISON OF EXPERIMENTAL RESULTS
TABLE II EXPERIMENT PARAMETERS
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