Reverse load flow analysis

Abstract

Uninterrupted supply of electricity is a key to the growth of a modern civilization. Over the years an interconnected high voltage grid system has proven to be the most viable and reliable source of electrical energy. One of the requirements for secure operation of such a system is that its lines should not be overloaded and buses should have a standard voltage level maintained. This thesis deals with a new approach to its solution. Instead of the conventional load flow analysis i.e. solving for unknown bus voltages and line flows using a specified set of generators’ real power (MW) output and loads, a reverse solution is proposed. Here from a specified set of loads, line flows within their thermal loading limits (MW) and the bus voltage magnitudes (close to 1.0 per unit) the unknown bus phase angles and then using these generators’ outputs (MW) are determined. This results in compliance with line flow limits and avoidance of under voltage at buses. In the initial stage of such a work and within the available time frame the proposed method has been tested on a four bus power system and compared against the results from a conventional load flow analysis using Gauss-Seidel algorithm.