1ec69698-0f8b-49cf-8ff7-864915550f7c20210108124940528wseamdt@crossref.orgMDT DepositWSEAS TRANSACTIONS ON ELECTRONICS1109-944510.37394/232017http://wseas.org/wseas/cms.action?id=133633520203520201110.37394/232017.2020.11http://www.wseas.org/wseas/cms.action?id=23188A Comparative Study of the UPFC System by Simulation with PI-D and (NEWELM and NIMC) Controllers Based on the Adaptive Control for the Compensation of PowerBouananeAbdelkrimDepartment of Electrical Engineering, L.G.E Laboratory, Dr. Mouly Taher University of Saida, Algeria, ALGERIAYahiaouiMerzougDepartment of Electrical Engineering, L.G.E Laboratory, Dr. Mouly Taher University of Saida, Algeria, ALGERIABenyahiaKhaledDepartment of Electrical Engineering, L.G.E Laboratory, Dr. Mouly Taher University of Saida, Algeria, ALGERIAChakerAbdelkaderDepartment of Electrical Engineering, LGEER Laboratory ENPO, Oran, ALGERIA-Flexible Alternating Current Transmission System devices (FACTS) are power electronic components. Their fast response offers potential benefits for power system stability enhancement and allows utilities to operate their transmission systems even closer to their physical limitations, more efficiently, with improved reliability, greater stability and security than traditional mechanical switching technology. The unified Power Flow Controller (UPFC) is the most comprehensive multivariable device among the FACTS controllers. According to high importance of power flow control in transmission lines, new controllers are designed based on the Elman Recurrent Neural Network (NEWELM) and Neural Inverse Model Control (NIMC) with adaptive control. The Main purpose of this paper is to design a controller which enables a power system to track reference signals precisely and to be robust in the presence of uncertainty of system parameters and disturbances. 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