Secure multiobjective real and reactive power allocation of thermal power units

Abstract

This paper presents best weight pattern evaluation approach to solve multiobjective load dispatch (MOLD) problem which determines the allocation of power demand among the committed generating units, to minimize a number of objectives. Operating cost, minimal impacts on environment, active power loss, are the objectives undertaken to be minimized subject to physical and technological constraints. MOLD problem is decomposed in two stages and is solved sequentially. In first stage, a optimization problem having multiple objectives which are function of only active power generation like operating cost, gaseous pollutant emissions, is solved to get optimal dispatch of active power generation, subject to meet the active power demand, generators’ capacity constraint and transmission active power line flow limits. In second stage, the system real power loss which is a function of reactive power generation is minimized, to get optimal reactive power generation, subject to meet reactive power demand, reactive power generators’ capacity constraint and transmission reactive power line flow limits, when active power generation is known in prior from first stage. The validity of the proposed method is demonstrated on 11-bus, 17-lines and 30-bus, 41-lines IEEE power systems.