1. 1.  Rubén Inzunza, , and Hirofumi Akagi to be presented at “IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 20, NO. 4, JULY 2005
   2. Hirofumi Akagi “ New trend in Active filter for power conditioning “ to be presented at the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL 32, NO 6, NOVEMBERDECEMBER 1996
   3. Xiongfei Wang, Frede Blaabjerg, and Marco Liserre Department of Energy Technology, Aalborg University, Aalborg, Denmark to be presented at IEEE2014
   4. J. G. Mark, J. R. Steele, and C. C. Hansen, “Residual mode phase locked loop,” U.S. Patent 4 495 475, Jan. 8, 1982
   5. J. Matas, M. Castilla, J. Miret, L. G. Vicuna, and R. Guzman, “An adaptive prefiltering method to improve the speed/accuracy trade off of voltage sequence detection methods under adverse grid conditions,” IEEE Trans. Ind. Electron., vol. 61, no. 5, pp. 2139-2151, May 2014.
   6. Xiongfei Wang and Ying Pang, Poh Chiang Loh, and Frede Blaabjerg “A Series-LC-Filtered Active Damper with Grid Disturbance Rejection for AC Power- Electronics-Based Power Systems” . I E E E Transactions on Power Electronics, 30(8), 4037-4041. 10.1109/TPEL.2014.2382477.
   7. R. N. Beres, X. Wang, F. Blaabjerg, C. L. Bak, and M. Liserre, “Comparative evaluation of passive damping topologies for parallel grid-connected converters with LCL filters,” in Proc. IEEE IPEC 2014, pp. 3320-3327.
   8. R. Inzunza and H. Akagi, “A 6.6-kV transformerless shunt hybrid active filter for installation on a power distribution system,” IEEE Trans. Power Electron., vol. 20, no. 4, pp. 893- 900, Jul. 2005.
   9. X. Wang, F. Blaabjerg, and M. Liserre, “An active damper to suppress multiple resonances with unknown frequencies,” in Proc. APEC 2014, pp. 2184-2191.
   10. B. Widrow, J. R. Glover Jr., J. M. McCool, J. Kaunitz, C. S. Williams, R. H. Hearn, J. R. Zeidler, E. Dong Jr. and R. C. Googlin, “Adaptive noise canceling: principles and applications,” in Proc. IEEE, vol. 73, no. 12, pp. 1692-1716, Dec. 1975.
   11. P. Rodriguez, A. Luna, R. S. Munoz-Aguilar, I. Qtadui, R. Teodorescu, and F. Blaabjerg, “A stationary reference frame grid synchronization system for three-phase gridconnected power converters under adverse grid conditions,” IEEE Trans. Power Electron., vol. 27, no. 1, pp. 99-112, Jan. 2012.
   12.  A. G. Yepes, F. Freijedo, O. Lopez, and J. Gandoy, “High-performance digital resonant controllers implemented with two integrators,” IEEE Trans. Power Electron., vol. 26, no. 2, pp. 563-576, Feb. 2011.