Power System Analysis and Design Lab
Lab 5
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Name: _______________________ ID: ____________________ Date: ____/____/_______
Experiment # 5:
Load Flow Analysis by Gauss-Seidel Method
(CLO 4, PLO 1,5)
Objective:
โข To develop a computer program to solve the set of nonlinear load flow equations using
Gauss-Seidal load flow iterative algorithm.
โข To understand the basic aspects of steady state analysis of power systems that are required
for effective planning and operation of power systems.
โข To understand the formulation of load flow model in complex form and a simple method
of solving load flow problems of small sized system using Gauss-Seidal iterative algorithm.
Software Required: MATLAB
Theory:
Load flow analysis is the study conducted to determine the steady state operating condition of the
given system under given conditions. This analysis is performed on a symmetrical steady-state
operating condition of a power system under โnormalโ mode of operation and aims at obtaining
bus voltages and line/transformer flows for a given load condition. This information is essential
both for long term planning and next day operational planning.
In long term planning, load flow analysis helps in investigating the effectiveness of alternative
plans and choosing the โbestโ plan for system expansion to meet the projected operating state. In
operational planning, it helps in choosing the โbestโ unit commitment plan and generation
schedules to run the system efficiently for them next dayโs load condition without violating the
bus voltage and line flow operating limits.
Many numerical algorithms have been developed and Gauss Seidel method is one of such
algorithms. The Gauss Seidal method is an iterative algorithm for solving a set of non- linear
algebraic equations. The relationship between network bus voltages and currents may be
represented by either loop equations or node equations. Node equations are normally preferred
because the number of independent node equation is smaller than the number of independent loop
equations.
