Load flow is an important tool used by power engineers for planning, to determine the best operation\nfor a power system and exchange of power between utility companies. In order to have an efficient\noperating power system, it is necessary to determine which method is suitable and efficient\nfor the system�s load flow analysis. A power flow analysis method may take a long time and therefore\nprevent achieving an accurate result to a power flow solution because of continuous changes\nin power demand and generations. This paper presents analysis of the load flow problem in power\nsystem planning studies. The numerical methods: Gauss-Seidel, Newton-Raphson and Fast Decoupled\nmethods were compared for a power flow analysis solution. Simulation is carried out using\nMatlab for test cases of IEEE 9-Bus, IEEE 30-Bus and IEEE 57-Bus system. The simulation results\nwere compared for number of iteration, computational time, tolerance value and convergence.\nThe compared results show that Newton-Raphson is the most reliable method because it\nhas the least number of iteration and converges faster.
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