Iterative Techniques for Load Flow Study: A Comparative Study for Nigerian 330kv Grid System as a Case Study
Adejumobi I.A.1, Adepoju G.A.2, Hamzat K. A.3
1Adejumobi I.A,  Department of Electrical and Electronic Engineering, Federal University of Agriculture, Abeokuta. Nigeria.
2Adepoju G.A,  Department of Electronic and Electrical Engineering, Ladoke Akintola University of Technology,  Ogbomoso, Nigeria.
3Hamzat K.A,  Department of Electrical and Electronic Engineering, Osun State College of Technology, Esa-Oke, Nigeria.
Manuscript received on September 25, 2013. | Revised Manuscript received on October 11, 2013. | Manuscript published on October 30, 2013. | PP: 153-158  | Volume-3, Issue-1, October 2013. | Retrieval Number:  F2043082613/2013©BEIESP

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Abstract: The purpose of any load flow analysis is to compute precise steady-state voltages magnitudes and angles of all buses in the network, the real and reactive power flows into every line and transformer, under the assumption of known generation and load. Model of power system generates non-linear algebraic equations and to solve these equations, three solution algorithms based on power equations of the methods were adopted. They were applied to two test power systems: IEEE 5-bus, IEEE 30- bus systems and a real power system, Nigerian 330kV 28-bus. The result of the application shows that number of iterations increases proportionally with the number of buses for Gauss Seidel technique while that of Newton –Raphson method remained almost practically constant even with varying number of buses. The Fast Decoupled method presented a slight increase in number of iterations with increasing number of buses but with faster convergence, when compared with Newton –Raphson methods. The Newton-Raphson method provided the best characteristics of quadratic convergence in minimum number of iterations and this method is best suited for Nigerian system.
Keywords: Load Flow, Gauss-Seidel, Newton Raphson, Fast Decoupled, Power Flow, Iteration.