STUDY FOR THE SYNCHRONIZATION OF CEB (COMMUNAUTE ELECTRIQUE DU BENIN) ELECTRICAL NETWORKS: CASE OF THE VOLTA RIVER AUTHORITY (VRA) AND THE TRANSMISSION COMPANY OF NIGERIA (TCN) S. Houndedako1, K. Kpode1, A. Vianou1, Ch. <...> Espanet2 1 Laboratoire d’Electrotechnique, de Tйlйcommunication et d’Informatique Appliquйe (LETIA) Ecole Polytechnique d’Abomey-Calavi, Universitй d’Abomey-Calavi 01 BP 2009 Cotonou, Bйnin 2FEMTO-ST Dйpartement Energie, Universitй de Franche-Comtй, France CEB is the only common structure for Benin and Togo, which provides electricity to these two countries. <...> The optimization of its power transmission network is very important. <...> Thus, the synchronization of its major sub-networks, namely Volta River Authority (VRA) and Transmission Company of Nigeria (TCN), aim not only to facilitate the network operation, but also to optimize and to reduce the inconvenience for people in Togo and Benin. <...> This synchronization depends on the electrical parameters of the TCN and VRA networks. <...> We studied the feasibility of this synchronization by providing a High Voltage Direct Current (HVDC) system that we have simulated in Matlab / SimPowerSystems software. <...> The demand for electric power in Africa and African western area in particular is rising and this tendency increases with the industrialization and the fast growth of the population. <...> It is the aim of the Benin Electric Community (CEB), charged to ensure self-sufficiency in electric power of Togo and Benin. <...> The coexistence of these two networks, TCN and VRA at the Sakйtй Station should have as advantage, through their pooling, optimal management and stability of the electrical supply network of CEB; but such is not the case because of the permanent fluctuation (variation of frequency and phase) of the Nigerian network making impossible the synchronization of the 47 Вестник РУДН, серия Инженерные исследования, 2014, № 4 two networks since the exploitation of numerical interconnection post 330/161/20 Kv– 412.5 MVA in Sakйtй (Benin) by February 2007. <...> MATERIALS AND METHODS Study of electric parameters (frequency and tension) of TCN and VRA networks Evolution of tensions TCN and VRA at the Sakйtй Station A respective follow-up of TCN tension on the set of bars and VRA tension on the L200 lines and L210 of network enabled us to plot with Excel the variation curves of tensions. <...> Through these curves, we note that the network tension <...>