Amirkabir University of Technology AUT Journal of Electrical Engineering 2588-2910 46 2 2015 09 23 Decentralized Frequency Restoration in Islanded Converter Base Microgrid Decentralized Frequency Restoration in Islanded Converter Base Microgrid 47 55 513 10.22060/eej.2015.513 EN M. Kosari PhD. Student, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran S. H. Hosseinian Professor, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran A. Mahmoudi PhD. Student, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran Journal Article 2015 11 29 Variation of frequency and voltage by load changes in a microgrid is a challenge in droop control method. Centralized restoration frequency or voltage in a microgrid requires communication link and therefore affects the advantage of decentralized droop control such as reliability, simplicity and inexpensiveness. This paper proposes a decentralized method that restores the frequency of a microgrid without any communication link and maintains these advantages. The method detects signal changing by wavelet transform (WT) to synchronize distributed energy resource (DER) that interfaced by converter to microgrid. Its operation principle and control method are explained and analyzed. The simulation results are presented to validate the effectiveness of the proposed method. https://eej.aut.ac.ir/article_513_3dc4876f3f08201c7c76cb71fa1da439.pdf