Publication

Abstract : Restructured electric system introduces a competitive environment among different market players that include power suppliers and buyers. The market players can enter into auction or bilateral contract depending on the model of market that covers single buyer, poolco or bilateral. The power transactions performed among selected players are based on the contract, decided through auction mechanism or bilateral agreement. The generating units of the selected suppliers are scheduled to generate the contracted power. A stable power system operation requires matching between gross generation and gross load. Due to power discrepancy between the gross power generation and demand leads to deviations in frequency and transmission line power. The load frequency controller restores this mismatch. The performance of the controller highly depends on the type of controller and its gain values. The work employs comparison and selection of the suitable among centralized and decentralized controller incorporated in the secondary loop of the load frequency controller. The selection is done based on the performance index and integral square error. The analysis is done employing the analytical model of two-area load frequency control functioning under poolco market model. The gain values of the secondary proportional integral derivative controller are obtained using Ziegler Nichols’ method. The analysis is performed in MATLAB/Simulink.