The modal analysis method is used to investigate the stability of the power system. Q-V curves are used to confirm the obtained results and to predict the stability margin or distance to voltage collapse based on the reactive power load demand. The load is connected to several selected buses in the Western System Coordinating Council (WSCC) 3-Machines 9-Bus power system . The weakest buses, which contribute the most to the critical mode, are identified using the participation factor. The Field Programmable Get Array (F.P.G.A) Technique is used to solve this problem on –line design programmable using the Very High Speed Language (V.H.D.L) technique. Two Spartan 3 Cit are used, the first is to resave power information from computer and the second is to transmit power information to the network.
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