Economic Dispatch Studies on Electric Power Systems

Abstract

Economic dispatch is defined as the process of allo-cating generation levels to the generating units in the mix, so that the system load may be supplied entirely and most newlineeconomically. To all intents and purposes, there has been newlineconcern that optimum economic dispatch was not the best envi- newlineronmentally. On the other hand, existing capacity is a source of most pollutant emissions, and technological change has newlineopened up opportunities for producing electricity in a newlinecleaner and cheaper manner. newlineIn the context to increasing public awareness of the environmental situation and the plea newlinefor c l e a n air, many organizations came up with a new method so called minimum emission dispatching method to reduce air pollution. However, this leads to a noticeable increase in newlinethe operating cost. In view of modern stringent requirements imposed on electric utilities and sluggish growth in demand, the power industry planners are indicating stronger trends newlinetowards supplying electric power of higher quality by improv- ing the system security and the impact on the environment in newlineparallel with pursuit of economy. Therefore, in order newlineto obtain a more meaningful and practical optimal schedule of operation for power system, a study on economic load dispatch newlinexvii newline newline is conducted in multiobjective framework where operating cost newlineand NOx emission objectives are undertaken simultaneously. Despite extensive research focusing on optimal power newlinescheduling problems, much of the effort to date has involved the development of deterministic models applicable to steady- state conditions. Most of these attempts assume the system data to be deterministic. It means that all input information newlineis known with complete certainty. Actually, there are several inaccuracies and uncertainties in the input information. The newlineeconomy of operation of power systems is significantly influ- enced to a certain degree by approximations in the operation planning procedures and by the inaccuracies and uncertainties newlinein input system information.