GIS BASED TRANSMISSION SYSTEM PLANNING

Abstract

Transmission network plays a key role in an electricity market. In addition to linking generators and loads, transmission network is also responsible for increasing competition, and helps to pick up the most efficient generators to supply loads. As electricity consumption grows, new transmission lines are needed to provide alternative paths for power transfer from generators to load centers for continuous supply. Only a proper transmission system can ensure an efficient power market. Transmission capacity shortage may result in serious consequences such as blackout, market manipulation, increase of congestion cost. This has lead to. increase in the role of the transmission network expansion planning. Transmission Expansion Planning is an important part of power system planning. Its task is to determine an optimal network configuration according to load growth. The basic principle of Transmission Expansion Planning is to minimize the network construction and operational cost satisfying the requirement of delivering electric power safely and reliably to load centres. The formulation used in the present work is a mixed integer nonlinear programming problem in which the objective function is to minimize the total cost consisting of investment cost, load curtailment cost and generation cost. Transmission expansion planning problem is solved by interior point direct algorithm. In this work the optimal transmission expansion planning has been considered using a geographic information system platform. GIS can be regarded as a collection of computer hardware, software and geographic data that people interact with to integrate analyze and visualize the data, It identifies relationships, patterns and trends, and find solutions to problems, the system is designed to capture, store and update, manipulate analyze and display the geographic information i.e. spatially referenced data. A GIS is typically used to represent maps as data layers that can be studied and used to perform analyses. In this work the GIS map consists of three layers. The first layer consists of buses in the transmission network and it is represented as a point attribute second layer consists of initial branches that are present in the network before transmission expansion planning and the third layer consists of the new branches that are added to the network after transmission network expansion planning. A GIS is chiefly used to collect manipulate analyze and present information that is linked to a location on the earth's surface.