Author : Prachi Godbole 1
Date of Publication :21st February 2018
Abstract: Optimal power flow analysis has been rapidly developing from last five decades and has gained an extreme importance in modern power system economics and operation. Traditionally, it is widely used for economic load dispatch and various methods are available in literature to solve these problems. These methods generally need conventional load flow to be carried out at the beginning for solving the optimal load flow equations. The proposed method directly calculates unknowns in power system without doing conventional iterative load flow analysis. In this paper, minimization of power loss in transmission lines is taken as objective function while maintaining active and reactive power balance and voltage limits using Lagrange nonlinear optimization approach. The solution determines bus voltage magnitudes and angles such that objective is attained while satisfying equality and inequality constraints. Complete analysis is carried out using proposed method on a simple three bus system and compared the results with Newton-Raphson load flow solution. It is observed that power loss can be reduced using proposed method while maintaining voltage at all the buses within the limit. The optimization method is also tested on IEEE 5 bus system and results are presented in this paper.
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