Load flow study in power system

Abstract

Load flow study epitomize the backbone of power system analysis and design; because many other analyses such as transient stability and contingency analysis are based on power flow analysis. Mainly Load flow study used to specify the various aspects of AC power parameters in the electric power system and the bus voltages is the most important one of these. Conventional techniques for solving the load flow problem are iterative, using the Newton-Raphson and the Gauss Seidel methods. Necessary the electric power system exposed to some probable conditions i.e.: sync M/C out of service, transmission line out of service, load out of service, and adding new loads to the system. These conditions may cause the voltages levels to be out of the specified limit, therefor the power flow studies might be carried out on power system to verify that voltages levels within the acceptable limit under these conditions. The weak buses in the system exemplify the optimal locations which the compensators set on to improve the voltages levels and to achieve system reliability and stability. Load flow study carried out on partial of Sudan national grid, consequently found out that voltages levels remain the specified limit under all studied conditions. Also the weak buses were determined. Besides SVC compensator has been used to improve voltages levels. Consequently, the objectives of this study were achieved.